摘要
基础原料铬酸钠的质量直接影响后续系列铬盐产品的品质。电化学氧化技术获得的铬酸钠电解液中可溶性硅在后期系列铬酸盐的制备过程中无法从自体系中去除,会残留在最终产品中进而影响后续铬盐产品的质量。为提高以铬酸钠电解液为原料制备的三氧化二铬产品品质,研究了以铬酸为酸化剂,调节铬酸钠电解液pH去除硅的方法。结果表明,优化反应条件:铬酸钠电解液pH=8,反应温度30℃,反应时间16 h,搅拌速度300 rpm。在此条件下,铬酸钠电解液中二氧化硅浓度降至200 mg/L以下。以除硅后的铬酸钠电解液为原料制备的三氧化二铬纯度达99.43%,满足颜料级三氧化二铬纯度要求(≥99.00%)。
The quality of subsequent series of chromium salt products is directly related to the quality of the basic material of sodium chromate.Soluble silicon in sodium chromate electrolyte obtained by electrochemical oxidation technology cannot be removed from the system during the preparation of subsequent series of chromates,which remains in the final products and affects the quality of subsequent chromium salt products.In order to improve the quality of chromic oxide prepared from sodium chromate electrolyte,we studied the method of removing silicon by adjusting the pH value of sodium chromate electrolyte with chromic acid as acidifier.The results showed that the optimal reaction conditions were obtained:pH value of sodium chromate electrolyte was 8,reaction temperature was 30℃,reaction time was 16 h and stirring speed was 300 rpm.Under these conditions,the concentration of silicon dioxide in sodium chromate electrolyte was reduced to less than 200 mg/L.The purity of chromic oxide prepared from sodium chromate electrolyte after removal of silicon was as high as 99.43%,which met the purity requirement of pigment grade chromic oxide(≥99.00%).
作者
叶雪梅
田森
董亚萍
冯海涛
刘鑫
李波
李武
张波
YE Xue-mei;TIAN Sen;DONG Ya-ping;FENG Hai-tao;LIU Xin;LI Bo;LI Wu;ZHANG Bo(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources,Xining,810008,China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining,810008,China;University of Chinese Academy of Sciences,Beijing,100049,China)
出处
《盐湖研究》
CSCD
2020年第2期101-108,共8页
Journal of Salt Lake Research
基金
电化学氧化铬铁制备铬酸钠新工艺的应用基础研究(2017-ZJ-786)
绿色、清洁铬化工技术的研发及产业化示范(2016-GX-A10)。
关键词
铬酸钠电解液
铬酸
硅
三氧化二铬
Sodium chromate electrolyte
Chromic acid
Silicon
Chromic oxide
