有色冶炼含砷烟气分级骤冷处理新工艺  

New Process of Arsenic-containing Flue Gas Grading QuenchTreatment in Non-ferrous Smelting

作　　者：苏江峰 方项林 高慧妹[2] 佟鑫 申健 陈儒稼 SU Jiangfeng;FANG Xianglin;GAO Huimei;TONG Xin;SHEN Jian;CHEN Rujia(SDIC Jincheng Metallurgy Co.,Ltd.,Lingbao 472500,China;China ENFI Engineering Corporation,Beijing 100038,China)

机构地区：[1]国投金城冶金有限责任公司,河南灵宝472500 [2]中国恩菲工程技术有限公司,北京100038

出　　处：《绿色矿冶》2024年第4期62-66,共5页Sustainable Mining and Metallurgy

摘　　要：有色冶炼行业处理含砷精矿时会产生高温含砷烟气。常规含砷烟气回收工艺为一步骤冷法,存在粗砷中三氧化二砷产品品位低、电除尘器收尘效率及使用寿命降低等问题。为此,本文提出含砷烟气分级骤冷处理新工艺,即对烟气进行分级吸收降温,在电除尘器进口设置一级骤冷塔,将烟气内的三氧化硫、氟化氢、氯化氢等杂质喷淋吸收,在电除尘器出口设置二级骤冷塔,利用喷淋液态水对烟气进行急冷降温,有效提高二级骤冷塔后收砷系统粗砷中的三氧化二砷品位。进行工艺优化后,产出三氧化二砷的品位达95%以上,远高于一步骤冷方法产出三氧化二砷70%~80%的品位,且提高了烟尘中金、银、铜等有价金属的回收率。在投矿品位相同时,分级处理工艺可大幅降低收砷系统粗砷产量及相应的处置费用,更利于粗砷的资源化利用,可为企业带来明显的经济效益。High temperature arsenic-containing flue gas will be produced when arsenic-containing concentrate is treated in non-ferrous smelting industry.The conventional arsenic flue gas recovery process is a one-step quenching method,which has problems such as low grade of arsenic trioxide products in crude arsenic,low dust collection efficiency and service life of electrostatic precipitators.Therefore,this paper proposed a new process of arsenic-containing flue gas grading and quenching treatment,that is,to cool the flue gas by grading absorption,to set up a first-stage quenching tower at the inlet of the electrostatic precipitator,to spray and absorb the impurities such as sulfur trioxide,hydrogen fluoride and hydrogen chloride in the flue gas,and to set up a second-stage quenching tower at the outlet of the electrostatic precipitator.The flue gas is rapidly cooled by spraying liquid water,which effectively improves the arsenic trioxide grade in the crude arsenic in the arsenic recovery system after the second-stage quenching tower.After the process optimization,the grade of arsenic trioxide produced is more than 95%,which is much higher than the grade of 70%-80%of arsenic trioxide produced by one-step quenching method,and the recovery rate of valuable metals such as gold,silver and copper in flue gas is improved.When the ore grade is the same,the grading treatment process can greatly reduce the crude arsenic production and the corresponding disposal cost of the arsenic collection system,which is more conducive to the resource utilization of crude arsenic and can bring obvious economic benefits to the enterprise.

关 键 词：含砷烟气处理 粗砷 三氧化二砷 骤冷收砷 

分 类 号：X701[环境科学与工程—环境工程]