Chromic acid-sulfuric acid oxidation bleaching is the key step in the process of preparation of refined montan wax,in which a large amount of wastewater containing chromium acid will be produced, causing great environment pollution. The indirect electrochemical oxidation method were used to optimize the current efficiency of the recovery of chromium-containing waste and the production of sodium hydrox-ide. According to the actual situation of the oxidation process of lignite wax,the optimal electrolysis condi-tions were as follows:the concentration of anodic sulphate was 0. 6 mol/L,the concentration of anode sul-furic acid was 0. 5 mol/L,the concentration of cathodic sodium hydroxide was 0. 8 mol/L,the current size was 8. 2 A and the electrolysis time was 10 h. Under these conditions,the anode current efficiency was 84. 91％,cathode current efficiency was 82. 01％ and the total current efficiency was 166. 92％.%铬酸-硫酸氧化脱色精制褐煤蜡过程中的关键步骤会产生大量含铬酸性废液,对环境造成极大污染.运用间接电化学氧化方法经过单因素和正交实验,优化了含铬废液回收铬与氢氧化钠联产过程中的电流效率.根据褐煤蜡氧化精制工艺实际情况确定最优电解条件为:阳极硫酸铬浓度0.6 mol/L,阳极硫酸浓度0.5 mol/L,阴极氢氧化钠浓度0.8 mol/L,电流8.2 A和电解时间10 h.在此条件下,阳极电流效率84.91％,阴极电流效率82.01％,总电流效率166.92％.
展开▼
