冷轧酸洗机组盐酸酸雾净化处理工艺探究  

Study on hydrochloric acid fume purification process in cold rolling pickling unit

作　　者：王森[1] 赵福轶 张颖 王耀 张毅[1] WANG Sen;ZHAO Fuyi;ZHANG Ying;WANG Yao;ZHANG Yi(WISDRI Engineering&Research Incorporation Limited,Wuhan 430223,China;Cold Rolling Silicon Steel Plant,Anshan Iron and Steel Co.,Ltd.,Anshan 114000,China)

机构地区：[1]中冶南方工程技术有限公司,湖北武汉430223 [2]鞍钢股份冷轧硅钢厂,辽宁鞍山114000

出　　处：《轧钢》2024年第6期116-121,共6页Steel Rolling

摘　　要：针对目前酸洗工艺酸耗较大、酸雾冷凝液回收价值低的问题,通过理论计算及实验,研究了酸雾净化系统中抽风压力和酸洗液中Fe^(m+)浓度对酸雾冷凝液盐酸浓度的影响。结果表明:同一原始160 g/L的盐酸溶液在60 kPa抽风压力下经蒸发冷凝得到的盐酸溶液浓度为40.1 g/L,而在5 kPa抽风压力下经蒸发冷凝得到的盐酸溶液浓度仅为10.9 g/L。另外,酸液中Fe^(m+)的存在不会改变酸雾中的HCl含量。为此,提出了相应改进措施:(1)将高、低浓度酸洗槽分开冷凝,将高浓度酸洗槽中的酸雾冷凝后直接回收至酸循环系统,将低浓度酸洗槽中的酸雾冷凝后替代部分漂洗废水输送至酸再生系统处理。(2)改进酸槽及抽风系统结构,降低酸雾量、回用部分冷凝盐酸液,从而实现酸雾减量化、绿色化处理。In view of the problems of high acid consumption and low recovery value of acid fume condensate in the current pickling process,the influence of exhaust pressure andFem+concentration in the acid fume purification system on the concentration of hydrochloric acid was studied through theoretical calculations and experiments.The results showed that the concentration of hydrochloric acid solution obtained by the original 160 g/L hydrochloric acid solution under-60 kPa extraction pressure was 40.1 g/L,while the concentration of hydrochloric acid solution obtained by the same original 160 g/L hydrochloric acid under-5 kPa extraction pressure was only 10.9 g/L.In addition,the presence of Fem+in the acid solution does not change the HCl content in the acid fume.To this end,corresponding improvement measures have been proposed:(1)separate the high and low concentration acid tanks for condensation,directly recycle the acid fume in the high concentration acid tank to the acid circulation system after condensation,and replace some of the rinsing waste water with condensed acid fume and transport it to the acid regeneration system for treatment.(2)improve the structure of the acid tank and exhaust system,reduce the amount of acid fume,and reuse some condensed hydrochloric acid solution to achieve acid fume reduction and green treatment.

关 键 词：盐酸 酸洗 酸雾净化 工艺改进 冷凝液回收 减量化 绿色化 

分 类 号：TQ1[化学工程]