石灰铁盐法处理高砷废酸应用研究  

Study on Application of Lime Ferric Salt Process for Treating High Arsenic Containing Waste Acid

作　　者：李益斌 张晓军 郭持皓 梁东东 曹佳旭 秦树辰 LI Yibin;ZHANG Xiaojun;GUO Chihao;LIANG Dongdong;CAO Jiaxu;QIN Shuchen(BGRIMM Technology Group,Beijing 100160,China;Shandong Jinchuang Gold and Silver Smelting Co.,Ltd.,Yantai 265600,Shandong.China)

机构地区：[1]矿冶科技集团有限公司,北京100160 [2]山东金创金银冶炼有限公司,山东烟台265600

出　　处：《有色金属（冶炼部分）》2024年第7期143-148,共6页Nonferrous Metals（Extractive Metallurgy)

基　　金：云南省重大科技专项计划资助项目(202302AB080012)。

摘　　要：选择工业具有代表性的高砷污酸,研究了石灰铁盐法控制性因素,如反应终点pH、Fe/As摩尔比、反应时间及氧化方式对除砷及固砷的影响。结合工业应用实际情况,在pH=1.2、石膏晶种比1∶1、反应时间2 h的条件下,优先产出合格石膏产品。再以H_(2)O_(2)为氧化剂,H_(2)O_(2)/As摩尔比1.5,反应终点pH=8,晶种比例1∶1,Fe/As摩尔比4.5,反应时间3 h进行除砷,除砷后液As浓度0.12 mg/L,小于标准值(0.5 mg/L),除砷率接近100%,除砷渣TCLP浸出毒性为2.25 mg/L,小于标准值(3 mg/L)。该工业应用工艺方法流程简单、操作方便、成本低廉,是一种可靠安全除砷固砷工艺。The representative industrial high arsenic containing waste acids was selected to study the effects of controlling factors,such as endpoint pH value,Fe/As molar ratio,reaction time,and oxidation method on arsenic removal and fixation in the lime ferric salt method.Combined with the actual situation of industrial application,under the conditions of pH=1.2,gypsum crystal seed ratio of 1∶1 and reaction time of two hours,the qualified gypsum products are preferred to be produced.The arsenic removal was carried out under the conditions including H_(2)O_(2)as oxidant,H_(2)O_(2)/As molar ratio of 1.5,reaction terminal pH value of 8,crystal seed ratio of 1∶1,Fe/As molar ratio of 4.5,and reaction time of three hours.The concentration of As after arsenic removal is 0.12 mg/L,which is lower than the standard value(0.5 mg/L),and the arsenic removal rate is close to 100%.The TCLP leaching toxicity of arsenic removal residue is 2.25 mg/L,which is lower than the standard value(3 mg/L).The industrial application process has the advantages of simple flow,convenient operation and low cost.It is a reliable and safe process for removing and fixing arsenic.

关 键 词：高砷废酸 石灰铁盐法 PH Fe/As摩尔比 氧化方式 稳定化 TCLP 

分 类 号：X52[环境科学与工程—环境工程] TF111.3[冶金工程—冶金物理化学]