含砷氟污酸资源化利用组合工艺的研究

摘要

以湖北某有色金属公司铜冶炼烟气制酸净化工段产生的含砷氟污酸(其中氟离子质量浓度为1149 mg/L,总砷质量浓度为2532 mg/L)为研究对象,采用"砷利用工序—氟利用工序—尾酸处理工序"的资源化利用组合工艺,在治理污酸达标排放的同时,回收砷、氟资源制得三氧化二砷、冰晶石产品.结果表明:控制适宜的药剂投加量及pH值、温度等,砷、氟的总去除率可达90％以上;制得的三氧化二砷与冰晶石产品分别符合YS/T 99—1997和GB/T 4291—2007的质量标准;再经过尾酸处理,出水砷、氟质量浓度分别为0.27 mg/L、5.4 mg/L,达到了《铜、镍、钴工业污染物排放标准》(GB 25467—2010)水质要求.%The waste smelting acid containing 1149 mg/L of fluoride and 2532 mg/L of total arsenic from the section of acid-making with smelting gas in a Nonferrous Metal Company in Hubei Province was investigated. The combined process of resource recycling which involves arsenic recycling and the fluorine recycling and acid treatment was adopted to recycle arsenic and fluorine resources, obtaining arsenic trioxide and cryolite products. The results indicated that the total removal rate of arsenic and fluoride reached more than 90％ by controlling the chemical dosage,pH value,temperature,etc.,and the arsenic trioxide and cryolite products could meet quality standards of YS/T 99—1997 and GB/T 4291—2007,respectively. The final effluent after acid treatment process contained arsenic(0.27 mg/L)and fluorine(5.4 mg/L),which was qualified by GB 25467—2010.