硫化氢酸解法副产物硫酸钠废水蒸发结晶工艺优化改造  

Optimization and Modification of the Evaporative Crystallization Process of Sodium Sulfate Effluent as Byproduct of Hydrogen Sulfide Acidolysis Method

作　　者：初长青 张桧楠 侯辉南 唐甜甜 CHU Chang-qing;ZHANG Hui-nan;HOU Hui-nan;TANG Tian-tian

机构地区：[1]山东恒邦冶炼股份有限公司,山东烟台264109

出　　处：《有色冶金节能》2022年第2期53-57,共5页Energy Saving of Nonferrous Metallurgy

摘　　要：采用硫化法对稀酸中的重金属进行脱除回收时,通过硫氢化钠与硫酸的酸解反应制备硫化剂硫化氢,副产物硫酸钠溶液采用蒸发结晶装置制备成硫酸钠固体。针对已有三效蒸发装置存在的输送管道堵塞、蒸发冷凝水含盐量高、晶体粒度过细、母液跑混等问题,进行设备结构、工艺流程优化:在第一效、第三效分离器底部设计盐腿,将各效循环泵改为大流量、低扬程的轴流泵,增大结晶蒸发室储料容积等。优化改造后,蒸发结晶系统连续稳定运行,开车率提高,系统冷凝水含盐量低于0.1 g/L。The heavy metals in dilute acid were removed and recovered by the vulcanization method.The hydrogen sulfide was prepared by the reaction of sodium hydride and sulfuric acid.The by-product sodium sulfate solution was prepared into sodium sulfate solid by evaporation crystallization device.In view of the problems existing in the existing three-effect evaporation device,such as pipeline blockage,high salt content of evaporative condensate water,too fine crystal particle size,and mother liquor running and mixing,the equipment structure and process flow were optimized:the salt leg was designed at the bottom of the primary and three-effect separators,and each effect circulating pump was changed to the axial flow pump with large flow rate and low head,and the storage volume of the crystal evaporation chamber was increased.After the optimization,the evaporation crystallization system runs continuously and stably,the driving rate is improved,and the salt content of condensate water is less than 0.1 g/L.

关 键 词：硫化法 稀酸 酸解法 硫酸钠 废水 蒸发结晶 三效蒸发 

分 类 号：TF803.21[冶金工程—有色金属冶金]