铜冶炼车间回用水分盐中试试验研究

Pilot test and research of desalination in recycle water in copper smelting workshop

为实现废水的近零排放和资源化处理,采用“生物制剂与双碱法协同脱钙+反渗透装置浓缩+纳滤装置分盐+电渗析装置浓缩+蒸发结晶装置出盐”工艺处理某铜冶炼车间回用水.结果表明,SO_(4)^(2-)截留率>99%,Na_(2)SO_(4)浓水溶解性总固体(TDS)质量浓度达179 g/L,NaCl浓水TDS质量浓度达150 g/L,浓缩液蒸发结晶后得到Na_(2)SO_(4)与NaCl产品盐.Na_(2)SO_(4)达到GB/T 6009-2014《工业无水硫酸钠》二类合格品要求,NaCl满足GB/T 5462-2015《工业盐质量标准》中一级标准.解决了回用水浓水浓度低、Na_(2)SO_(4)产品为杂盐等问题,为有色行业经济高效地处理高含盐废水奠定了工程化基础.

In order to realize Near Zero Emission and resource utilization in wastewater treatment,the reuse water from a copper smelting workshop was treated using a process involving biological agents,double alkali decalcification,reverse osmosis concentration,nanofiltration salt separation,electrodialysis concentration,and evaporation crystallization salt removal.The experimental result shows that the retention rate of SO_(4)^(2-)reaches>99%,the total soluble solids(TDS)of Na_(2)SO_(4)in concentrated water reaches 179 g/L,and the TDS of NaCl in concentrated water can reach 150 g/L.After concentration and separation,Na_(2)SO_(4)and NaCl salt product are precipitated,and Na_(2)SO_(4)meets the requirements of Class II qualified product defined in GB/T 6009-2014 Industrial Anhydrous Sodium Sulfate,and NaCl meets the Class I standard defined in GB/T 5462-2015 Industrial Salt Quality Standard.This process solves the problem of low concentration in recycled concentrated water and removes the impurities in Na_(2)SO_(4)products,providing bases for the cost-effective engineering treatment of high salty wastewater in the non-ferrous industry.