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《Earth Science Frontiers》 2005-01
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Preparation of potassium carbonate from insoluble potash ores: With 13X molecular sieve as a byproduct

MA Hong-wen, BAI Zhi-min, YANG Jing, WANG Ying-bin, QI Hong-bin, BAI Feng, ZHANG Xi-huanNational Laboratory of Mineral Materials, China University of Geosciences, Beijing 100083, China  
Insoluble potash ores of different types from nine representative localities are characterized by potassium feldspar as major mineral phase enriched in potassium. By pretreating the ores with such a procedure as ore crushing, bed sorting, wet magnetic sorting, and iron removing by acid leaching, potassium feldspar powders with purity as high as 75% to 95% were prepared first in this research. Then, with sodium carbonate as an additive, the powders were calcinated at 760~860 ℃, leading to thermally decomposition of potassium feldspar to form a mixture of sodium metasilicate and sodium (potassium) metaluminate, from which 13X type molecular sieve was hydrothermally synthesized. The physicochemical properties of the product are as good as those of its industrial analogues. The liquors filtered from the synthesized zeolites were rich in K~+, Na~+, and \[SiO_2(OH)_2\]~(2-) ions. By introducing CO_2 gas into the liquids, metasilicic acid precipitants were formed, which were further calcinated at around 250 ℃ for 2hrs to form precipitated silica. The residual liquors were then water-salt solutions in the ternary system of NaHCO_3-KHCO_3-H_2O. By evaporation, crystallization of NaHCO_3, separation from the liquids, and then evaporating the residual liquors, and crystallization of KHCO_3, both of precipitants were separated owing to much smaller solubility of the former, and at last, by calcinating the precipitants at 200 ℃ for 2hrs, both of sodium carbonate and potassium carbonate were prepared. The precipitated silica and potassium carbonate products well satisfy the China's Chemical Industrial standard HG/T 2690-95 and the China's National Standard GB 1587-2000 respectively. In such a way, the components of K_2O, Al_2O_3, and SiO_2 in potassium feldspar of the ores are all manufactured to valuable chemical products, giving rise to nearly 100% output coefficient of the potassium feldspar resources, close to zero discharge of solid wastes, wastewaters, and exhaust gases. The technique is a “green process”, characterized by energy conservation, high efficiency, and clean production. It is therefore feasible to be industrialized both in economic benefits and in environmental kindness.
【Fund】: 教育部博士学科点基金项目(1999049114);; 北京市农业科技发展计划项目(953500400);; 天津市地矿局富钾岩石详查项目(津地任[1997]10号);; 山西省科技发展计划项目(001065)
【CateGory Index】: TQ127.13
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