石墨炉原子吸收法测定湿法炼锌含锌中间物料中铊含量  

Determination of thallium content in zinc containing intermediate materials of zinc hydrometallurgy by graphite furnace atomic absorption spectrometry

作　　者：金忠 高品芳 张昱琛 巩燕飞 卓劼君 李彦龙[3] JIN Zhong;GAO Pinfang;ZHANG Yuchen;GONG Yanfei;ZHUO Jiejun;LI Yanlong(Chengzhou Zinc Smelter,Gansu Changba Non-ferrous Metal Co.Ltd.,Longnan 742508,China;Baiyin Nonferrous Group Co.Ltd.,Baiyin 730900,China;Northwest Research Institute of Mining and Metallurgy,Baiyin 730900,China)

机构地区：[1]甘肃厂坝有色金属有限公司成州锌冶炼厂,甘肃陇南742508 [2]白银有色集团股份有限公司,甘肃白银730900 [3]西北矿冶研究院,甘肃白银730900

出　　处：《中国有色冶金》2023年第3期34-40,共7页China Nonferrous Metallurgy

基　　金：甘肃省重点研发计划项目(22YF7GD194);国家重点研发计划项目(2019YFC1907303)。

摘　　要：铊及其化合物有剧毒,在湿法炼锌工艺生产过程中存在环境污染风险,但是湿法炼锌过程中间物料中铊的存在形态复杂,含量低且不稳定,造成湿法炼锌过程含铊中间物料中铊的跟踪监测与检测较为困难。本文利用铁盐及硫酸-溴化钾萃取富集消除复杂基体成分对铊测定的干扰,使Tl^(3+)与Br^(-)形成的[TlBr_(4)]^(-)配阴离子被甲基异丁基甲酮(MIBK)定量萃取后形成离子配合物,进行有机相中铊的测定。通过优化仪器测定条件,确定石墨炉灰化温度400℃,原子化温度1650℃,从而实现对锌冶炼工艺含锌中间物料中铊元素含量的准确测定。方法的检出限为0.27μg/L,RSD<10%,加标回收率为95.2%~102.6%,分析结果经与ICP-MS检测数据对比,结果准确可靠。Thallium and its compounds are highly toxic.There are environmental pollution risks in the production process of zinc hydrometallurgy process.However,the existence of thallium in the intermediate materials of zinc hydrometallurgy process is complex,and the content is low and unstable,which makes it difficult to track,monitor and detect thallium in the intermediate materials of zinc hydrometallurgy process.In this paper,iron salt and potassium bromide extraction were used to eliminate the interference of thallium determination by complex matrix components.The[TlBr_(4)]^(-)complex anions formed by Tl3+and Br-were quantitatively extracted by methyl isobutylmethone(MIBK).Finally,thallium in the organic phase was determined.By optimizing the instrument measurement conditions,the graphite furnace ash temperature was 400℃,the atomic temperature was 1650℃,thus realizing the accurate determination of thallium content in the intermediate materials of zinc smelting process.The detection limit of the method was 0.27μg/L,RSD<10%,and the added standard recovery rate was 95.2%~102.6%.The method was verified by the national standard material,and the results were accurate and reliable.

关 键 词：石墨炉原子吸收法 湿法炼锌 铊 检测 硫酸-溴化钾介质 甲基异丁基甲酮 萃取 回收率 

分 类 号：TF813[冶金工程—有色金属冶金] TF03