湿法炼锌污酸处理中石膏渣减量化工艺探索  

Exploration on the Reduction Process of Calcium Sulfate Residue in Zinc Hydrometallurgy Contaminated Acid Treatment

作　　者：朱应旭 陶家荣 世仙果 李云 张亮 李科 陈先友 ZHU Yingxu;TAO Jiarong;SHI Xianguo;LI Yun;ZHANG Liang;LI Ke;CHEN Xianyou(Yunxi Wenshan Zinc Indium Smelting Co.,Ltd.,Wenshan 663700,China)

机构地区：[1]云锡文山锌铟冶炼有限公司,云南文山663700

出　　处：《绿色矿冶》2024年第1期44-48,共5页Sustainable Mining and Metallurgy

摘　　要：针对目前湿法炼锌中采用石灰中和法处理污酸产生的石膏渣量较大的问题,本文提出采用锌焙砂-碳酸钙两段中和法处理硫化后液的工艺并进行试验。该工艺通过锌焙砂中和部分酸,再采用碳酸钙进行中和,将氟除去的同时减少污酸石膏渣产量。实验结果表明,采用锌焙砂中和时,控制pH值为2.0~2.5,在温度35℃条件下中和1 h,沉降过滤后采用碳酸钙进行二段中和,控制终点pH为5.0~5.5,反应1 h,沉氟后液含氟量小于20 mg/L,沉氟率超过98%,产出石膏渣仅为传统石灰中和法所产石膏渣量的24.94%,溶液经过除氯后可返回湿法系统中。Aiming at the problem that the amount of gypsum residue produced by the treatment of contaminated acid by lime neutralization method in zinc hydrometallurgy is large,this paper proposed a process of using zinc calcine-calcium carbonate two-stage neutralizations method to treat the liquid after vulcanization.The process neutralizes part of the acid by zinc calcine and then neutralizes it by calcium carbonate,which removes fluorine and reduces the production of waste acid gypsum residue.When zinc calcine is used for neutralization,the pH value is controlled to be 2.0~2.5,and the neutralization is carried out at 35℃for 1 h.After sedimentation and filtration,calcium carbonate is used for the second stage neutralization.The end point pH is controlled to be 5.0~5.5,and the reaction time is 1 h.Under these conditions,the fluorine content of the solution after fluorine precipitation is less than 20 mg/L,and the fluorine precipitation rate is more than 98%.The output gypsum slag is only 24.94%of the gypsum slag produced by the traditional lime neutralization method.The solution can be returned to the wet system after subsequent dechlorination.

关 键 词：污酸 硫化后液 硫化-中和法 锌焙砂中和 碳酸钙中和 石膏渣 

分 类 号：TF803[冶金工程—有色金属冶金]