铬盐清洁工艺亚熔盐介质脱除铝酸钾、碳酸钾研究Ⅰ.——溶解度  

Removal of potassium aluminate and potassium carbonate from sub-molten media in a new cleaner production technology of chromate I.solubility

作　　者：杜春华[1] 

机构地区：[1]青岛农业大学山东省农业仿生应用工程技术研究中心

出　　处：《化工科技》2008年第4期5-8,共4页Science & Technology in Chemical Industry

基　　金：中科院知识创新重大项目(KCCX1-SW-22);国家863计划资助项目(2005AA647010);国家自然科学重点基金资助项目(50234040)

摘　　要：脱除铝酸钾、碳酸钾等杂质是铬盐清洁工艺亚熔盐介质循环利用的重要环节。作者测定了40℃及95℃KOH-K2CO3-Al2O3-SiO2-H2O体系部分溶解度,确定该体系存在K2O.Al2O3.3H2O(即KAlO2.1.5H2O)与K2CO3.1.5H2O等平衡固相,为亚熔盐介质的冷却结晶除杂过程控制提供了热力学依据和指导。The effective removal of potassium aluminate and potassium carbonate from the sub-molten salt is of great importance before it is recycled as reaction media in the new cleaner production technology of chromate. Some solubility data for the KOH-K2CO3-Al2O3-SiO2-H2O system at 95 ℃ and 40 ℃ were determined and the equilibrium solid-phase K2O· Al2O3 · 3H2O, i. e. KAlO2 · 1.5 H2O, and K2CO3 · 1. 5H2O was indentified by XRD analysis. The research provides a thermodynamic basis for the process control of the cooling crystallization of the sub-molten salt media to remove the impurities.

关 键 词：铬盐清洁生产 亚熔盐介质 溶解度 铝酸钾 碳酸钾 

分 类 号：TQ136.11[化学工程—无机化工]