CuSO4对氰化提金贫液中SCN-的沉淀效果以及对共存离子浓度的影响  

Influence of CuSO4 on SCN-precipitation effect and coexisting ions concentration in cyanide waste water

作　　者：党晓娥 淮敏超 DANG Xiao'e;HUAI Minchao(Key Laboratory for Gold and Resources of Shaanxi,College of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,Shaanxi,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西省黄金与资源重点实验室,陕西西安710055

出　　处：《化工学报》2020年第3期1310-1316,共7页CIESC Journal

基　　金：国家自然科学基金青年科学基金项目(51204130)。

摘　　要：针对氰化提金贫液循环利用过程SCN-积累以及外排带来的环境污染问题,以CuSO4作为沉淀剂处理某高浓度SCN-贫液,考察了沉淀剂用量、沉淀时间及沉淀温度对SCN-沉淀效果和对共存离子浓度的影响。结果表明,当在贫液中加入1.6倍化学反应计量的CuSO4后于室温搅拌60 min,SCN-的去除率达87.5%以上,体系中TCu、S2O32-和SO32-浓度也大幅降低,同时得到纯度达97%以上的CuSCN产品。沉SCN-后的贫液只需石灰中和并沉部分SO42-后,其活性得到进一步恢复,可直接返回金精矿浸出工序充分利用其中的CN-,实现提金贫液的循环利用。In view of the environmental pollution caused by SCN-accumulation and efflux in the process of cyanide waste water recycling, CuSO4 was used as a precipitant to treat cyanide waste water bearing SCN-. The effects of precipitant dosage, precipitation time and precipitation temperature on SCN-precipitation effect and coexisting ion concentration were investigated. The results show that the SCN-precipitation rate is up to 87.5% when 1.6 times the chemical reaction amount of CuSO4 is added into it at the room temperature for stirring 60 min, the concentration of TCu, S2O32- and SO32- is sharply reduced. At the same time, the purity of CuSCN products with more than 97% is obtained. Part of SO42- is precipitated after the waste water only need neutralized by lime, its activity is further restored and the treated water could be directly returned to the concentrate leaching process and the remaining CNin it is fully used, the toxic cyanide water recycling is realized.

关 键 词：提金贫液 循环 积累 污染 沉淀 共存离子 回收 

分 类 号：X753[环境科学与工程—环境工程]