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《Geochimica》 2005-06
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Migration characteristics of thallium in utilization of pyrite

WU Ying-juan1, XIE Wen-biao1, CHEN Yong-heng1, CHANG Xiang-yang1, TU Xiang-lin2 1. School of Environmental Science and Engineering, Guangzhou University, Gua ngzhou 510006, China; 2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzho u 510640, China  
Based on the experimental researches of soak, model leaching and seq ue ntial extraction, combined with technological process, the numerous experimental researches were carried out to study migration characteristics of thallium in f urnace dust, slag and dreg in utilization of pyrite. The results show that most thallium is moved from ore to furnace dust and slag, and some thallium is moved to gas as TlF form when pyrite is roasted. Release rates of thallium from furnac e dust, slag and dreg vary directly with soak time, and inversely with pH and si ze of sample (except fresh sample of dreg). Release rates of thallium from fresh samples are more than those from old samples, and release rates of thallium fro m soak samples are more than those from leaching samples. When the thallium cont ent in the extraction form of the samples is high, or that in the non-extracti on form of the furnace dust is high and there are some hydrogen fluoride, sulfur dioxide and sulfur trioxide in the furnace dust, the thallium is migrated easil y. When the thallium content contained in carbonate minerals is high, the thalli um is migrated easily under acidic condition. Moreover, keeping slag and dreg un der neutral or near neutral condition, the leaching of thallium in slag and dreg can be effectively prevented.
【Fund】: 国家自然科学基金(20477007);; 广东省自然科学重点基金(36210);; 广东省科技计划项目(2002C31607);; 广东省重大科技专项基金(2004A3038002);; 广州市教育局科学研究基金(2001-01);; 广州大学科学研究专项基金(ZX-0205)~~
【CateGory Index】: X753;
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