高温反应合成莫来石实现钒渣氯化残渣的无毒高效利用  

Synthesis of mullite by high temperature reaction to realize nontoxic and efficient recycling of vanadium slag chlorination residue

作　　者：刘仕元 薛未华 王丽君 周国治 Shi-yuan LIU;Wei-hua XUE;Li-jun WANG;Kuo-chih CHOU(Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学钢铁共性技术协同创新中心,北京100083 [2]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第8期2523-2534,共12页中国有色金属学报（英文版）

基　　金：the financial supports from the National Natural Science Foundation of China(Nos.51922003,51904286,51774027,51734002)。

摘　　要：采用氯化法从钒渣中提取有价元素(Ti、Cr、Fe、Mn和V)后得到的浸出渣主要成分为Al_(2)O_(3)和SiO_(2),还含有少量有害元素Cr和V。为了减少Cr和V对环境的污染,提出一种浸出渣无毒和有效利用的新方法。以浸出渣为原料,加入适量SiO_(2),在1600℃下固相烧结5 h,合成抗压强度为133.345 MPa、密度为3.20 g/cm^(3)的纯莫来石。浸出渣中的微量元素Ti和有害元素V和Cr在高温反应过程中进入莫来石晶格形成固溶体,稳定在莫来石相中。合成的样品采用毒性特性浸出程序(TCLP)和GB5085.3—2007进行检测。结果表明,莫来石符合毒性浸出标准,是一种安全无毒产品。The compositions of the leaching residue obtained by chlorination method to extract valuable elements(Ti,Cr,Fe,Mn and V)from vanadium slag were mainly Al_(2)O_(3) and SiO_(2) with a small amount of hazardous elements Cr and V.In order to reduce the pollution of V and Cr to the environment,a novel method for nontoxic and efficient recycling of leaching residue was proposed.Mullite with high compressive strength of 133.345 MPa and bulk density of 3.20 g/cm^(3) was successfully synthesized by using leaching residue as raw material,adding appropriate SiO_(2) and roasting at 1600℃for 5 h.The trace element Ti and hazardous elements V and Cr in leaching residue entered the mullite lattice in the high temperature reaction process to form a solid solution,which were stabilized in the mullite phase.The synthesized samples were tested by toxicity characteristic leaching procedure(TCLP)and GB5085.3—2007.The results showed that mullite met the toxic leaching standard and was a nontoxic product.

关 键 词：浸出残渣 钒渣 综合利用 高毒性六价铬 莫来石 毒性特性浸出程序 

分 类 号：TQ175.712.1[化学工程—硅酸盐工业]