硫酸钠废盐资源化处置研究  

Recycling Research of Sodium Sulfate Waste Salt

作　　者：刘孟博 韩颖 张威 LIU Mengbo;HAN Ying;ZHANG Wei

机构地区：[1]维尔利环保科技集团股份有限公司,江苏常州213000

出　　处：《上海化工》2024年第3期16-20,共5页Shanghai Chemical Industry

摘　　要：基于硫酸钠与碳酸氢铵联合制碱的原理,研究了硫酸钠初始质量浓度、反应时长、反应物物质的量比等因素对产物碳酸钠质量分数和原料硫酸钠转化率的影响;对制碱得到的母液,以蒸发浓缩进行分盐处理,考察了硫酸、浓缩倍数和冷却温度等因素对所得盐中硫酸铵质量分数的影响。硫酸钠制碱实验的最优条件为:反应时间为1 h,硫酸钠溶液初始质量浓度约为330 g/L,硫酸钠和碳酸氢铵的物质的量比约为1∶1。该条件下,得到的固体碳酸钠质量分数高于90%。经母液蒸发浓缩后,硫酸铵和硫酸钠以复盐的形式析出,硫酸铵质量分数可达到85%。加入硫酸、提高浓缩倍数、降低冷却温度都会降低复盐中硫酸铵的质量分数。Based on the principle of alkali production by sodium sulfate and ammonium bicarbonate,the effects of key factors such as initial concentration of sodium sulfate,reaction time and molar ratio of reactants on the purity of sodi-um carbonate and the conversion rate of sodium sulfate were studied.The residual mother liquor was subjected to salt sep-aration treatment by evaporation concentration,and the effects of sulfuric acid,concentration ratio and cooling temperature on the mass fraction of ammonium sulfate in the obtained salt were explored.The optimal condition parameters for alkali preparation are as follows:the reaction time is 1 h,the initial concentration of sodium sulfate solution is about 330 g/L and the molar ratio of sodium sulfate to ammonium bicarbonate is about 1:1.Under above conditions,the mass fraction of solid sodium carbonate is higher than 90%.After evaporation and concentration of the mother liquor,ammonium sulfate and sodium sulfate are separated out in the form of double salt,and the content of ammonium sulfate can reach 85%.Adding sulfuric acid,increasing the concentration ratio and reducing the cooling temperature will reduce the mass fraction of ammonium sulfate in the double salt.

关 键 词：硫酸钠 资源化 废盐 高盐废水 

分 类 号：X705[环境科学与工程—环境工程]