Comprehensive use of dolomite-talc ore to prepare talc, nano-MgO and lightweight CaCO3 using an acid leaching method
The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Li, Ge [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2013transfer abstract |
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| Umfang: |
8 |
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| Übergeordnetes Werk: |
Enthalten in: Routine practice data of three cancer entities: Comparison among cancer registry and health insurance data - Lang, Lisa M. ELSEVIER, 2023, an international journal on the application and technology of clays and clay minerals, New York, NY [u.a.] |
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| Übergeordnetes Werk: |
volume:86 ; year:2013 ; pages:145-152 ; extent:8 |
| Links: |
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| DOI / URN: |
10.1016/j.clay.2013.09.015 |
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ELV038682354 |
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| 520 | |a The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. | ||
| 520 | |a The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. | ||
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10.1016/j.clay.2013.09.015 doi GBVA2013006000030.pica (DE-627)ELV038682354 (ELSEVIER)S0169-1317(13)00320-7 DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.04 bkl 44.00 bkl Li, Ge verfasserin aut Comprehensive use of dolomite-talc ore to prepare talc, nano-MgO and lightweight CaCO3 using an acid leaching method 2013transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. Li, Zenghe oth Ma, Hongwen oth Enthalten in Elsevier Lang, Lisa M. ELSEVIER Routine practice data of three cancer entities: Comparison among cancer registry and health insurance data 2023 an international journal on the application and technology of clays and clay minerals New York, NY [u.a.] (DE-627)ELV009615261 volume:86 year:2013 pages:145-152 extent:8 https://doi.org/10.1016/j.clay.2013.09.015 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.04 Ausbildung Beruf Organisationen Medizin VZ 44.00 Medizin: Allgemeines VZ AR 86 2013 145-152 8 045F 550 |
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10.1016/j.clay.2013.09.015 doi GBVA2013006000030.pica (DE-627)ELV038682354 (ELSEVIER)S0169-1317(13)00320-7 DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.04 bkl 44.00 bkl Li, Ge verfasserin aut Comprehensive use of dolomite-talc ore to prepare talc, nano-MgO and lightweight CaCO3 using an acid leaching method 2013transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. Li, Zenghe oth Ma, Hongwen oth Enthalten in Elsevier Lang, Lisa M. ELSEVIER Routine practice data of three cancer entities: Comparison among cancer registry and health insurance data 2023 an international journal on the application and technology of clays and clay minerals New York, NY [u.a.] (DE-627)ELV009615261 volume:86 year:2013 pages:145-152 extent:8 https://doi.org/10.1016/j.clay.2013.09.015 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.04 Ausbildung Beruf Organisationen Medizin VZ 44.00 Medizin: Allgemeines VZ AR 86 2013 145-152 8 045F 550 |
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10.1016/j.clay.2013.09.015 doi GBVA2013006000030.pica (DE-627)ELV038682354 (ELSEVIER)S0169-1317(13)00320-7 DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.04 bkl 44.00 bkl Li, Ge verfasserin aut Comprehensive use of dolomite-talc ore to prepare talc, nano-MgO and lightweight CaCO3 using an acid leaching method 2013transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. Li, Zenghe oth Ma, Hongwen oth Enthalten in Elsevier Lang, Lisa M. ELSEVIER Routine practice data of three cancer entities: Comparison among cancer registry and health insurance data 2023 an international journal on the application and technology of clays and clay minerals New York, NY [u.a.] (DE-627)ELV009615261 volume:86 year:2013 pages:145-152 extent:8 https://doi.org/10.1016/j.clay.2013.09.015 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.04 Ausbildung Beruf Organisationen Medizin VZ 44.00 Medizin: Allgemeines VZ AR 86 2013 145-152 8 045F 550 |
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10.1016/j.clay.2013.09.015 doi GBVA2013006000030.pica (DE-627)ELV038682354 (ELSEVIER)S0169-1317(13)00320-7 DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.04 bkl 44.00 bkl Li, Ge verfasserin aut Comprehensive use of dolomite-talc ore to prepare talc, nano-MgO and lightweight CaCO3 using an acid leaching method 2013transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. Li, Zenghe oth Ma, Hongwen oth Enthalten in Elsevier Lang, Lisa M. ELSEVIER Routine practice data of three cancer entities: Comparison among cancer registry and health insurance data 2023 an international journal on the application and technology of clays and clay minerals New York, NY [u.a.] (DE-627)ELV009615261 volume:86 year:2013 pages:145-152 extent:8 https://doi.org/10.1016/j.clay.2013.09.015 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.04 Ausbildung Beruf Organisationen Medizin VZ 44.00 Medizin: Allgemeines VZ AR 86 2013 145-152 8 045F 550 |
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10.1016/j.clay.2013.09.015 doi GBVA2013006000030.pica (DE-627)ELV038682354 (ELSEVIER)S0169-1317(13)00320-7 DE-627 ger DE-627 rakwb eng 550 550 DE-600 610 VZ 44.04 bkl 44.00 bkl Li, Ge verfasserin aut Comprehensive use of dolomite-talc ore to prepare talc, nano-MgO and lightweight CaCO3 using an acid leaching method 2013transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. Li, Zenghe oth Ma, Hongwen oth Enthalten in Elsevier Lang, Lisa M. ELSEVIER Routine practice data of three cancer entities: Comparison among cancer registry and health insurance data 2023 an international journal on the application and technology of clays and clay minerals New York, NY [u.a.] (DE-627)ELV009615261 volume:86 year:2013 pages:145-152 extent:8 https://doi.org/10.1016/j.clay.2013.09.015 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.04 Ausbildung Beruf Organisationen Medizin VZ 44.00 Medizin: Allgemeines VZ AR 86 2013 145-152 8 045F 550 |
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Comprehensive use of dolomite-talc ore to prepare talc, nano-MgO and lightweight CaCO3 using an acid leaching method |
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The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. |
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The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. |
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The talc powder associated with dolomite, from Luonan county, Shaanxi province, China, was leached with 2.25mol hydrochloric acid (37%) to obtain MgCl2–CaCl2 solution and purified talc powder. The iron cations in the solution were removed by adding 9% sodium hypochlorite as an oxidant, and adjusting the solution pH to 7. Magnesium hydroxide was obtained after ammoniation of the solution using 26% ammonia until pH above 12. Magnesium oxide nanoparticles were prepared by calcining the magnesium hydroxide at 800°C for 4h. Then, CO2 gas, at concentrations of either 40% or 99.9%, was bubbled through the CaCl2–NH4Cl solution, to form aragonite or vaterite, respectively. This work mainly investigates the effect of molar volume of the hydrochloric acid on dolomite solution, the effect of pH on the Mg2+ precipitation yield, the effect of calcination temperature on the average grain size and morphology of the MgO particles, and the effect of CO2 gas concentrations on the calcium carbonate crystal polymorphs. Scanning electron microscopy, X-ray diffraction and chemical analysis methods were used to characterize the products. The magnesium oxide nanoballs formed, with average particle size of 80–100nm and purity of 99.14%, can be used in catalysis, as refractory materials, and in a range of other applications. The purities of both aragonite and vaterite were above 98%, and both products gave whiteness values over 96%. The technique presented in this work, which features low energy consumption and high use ratio, is a potential environmentally friendly way for clean processing of low-grade dolomite-talc ores. |
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