铜冶炼烟气制酸净化设备、管道结晶分析及对策

介绍了烟台国润铜业有限公司制酸净化系统出现的设备、管道结晶问题,对结晶物成分及产生原因逐一分析,最终确定为铜精矿和煤中的氯元素进入冶炼烟气,在净化工序中被洗涤进入废酸中,与氢氧化钙反应,形成氯化钙,导致返回净化工序的回用水钙含量高,钙元素形成硫酸钙导致净化工序设备、管道结晶.进行了超高石灰铝法去除氯离子的小试,结果无法...

Analysis and Countermeasures of Copper Smelting Off-gas Acid-making Cleaning Equipment and Pipeline Crystallization

This paper introduced the crystallization of equipment and pipeline in the acid-making cleaning system of Yantai Guorun Copper Co.,Ltd.,analyzed the composition and causes of the crystallization one by one,and finally had the conclusion that the chlorine element in copper concentrete and coals enter the smelting flue gas,and then enter the waste acid in the purification process,and react with calcium hydroxide to form calcium chloride,which leading to the high content of calcium in the reclaimed water returned to the cleaning process,and the formation of calcium sulfate causes the crystallization of equipment and pipeline in the cleaning process.The bench-scale test of removing chloride ion by ultra-high lime aluminum method was carried out,and the results could not achieve the effect in theory.Finally,through the control of raw and auxiliary materials,the chlorine element brought into the cleaning process by off-gas and the content of chloride ion in waste acid and reclaimed water was decreased,which generated less calcium content in reclaimed water and reduced the crystallization of cleaning equipment and pipeline,thus the acid making system can be operated normally and stably.