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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第6期    总第255期    2020年6月

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文章编号:1004-0609(2020)-06-1427-10
脆硫铅锑精矿富氧直接熔炼渣型理论研究
张忠堂,戴 曦

(中南大学 冶金与环境学院,长沙 410083)

摘 要: 对脆硫铅锑精矿富氧直接熔炼渣型理论进行研究。根据富氧直接熔炼过程炉渣组成特性,选取FeO-SiO2-CaO-ZnO渣系为研究对象。采用热力学软件Factsage计算并绘制FeO-SiO2-CaO-ZnO渣系相图,考察CaO与SiO2质量比、Fe与SiO2质量比、ZnO含量及温度对该渣系熔化温度及黏度的作用规律,并在此理论基础上进行实验研究。理论研究表明,熔炼过程炉渣中Fe与SiO2质量比和CaO与SiO2质量比的增大均会提高炉渣的熔化温度。随着体系温度的升高,炉渣的黏度逐渐减小,1250 ℃时,炉渣的黏度均小于0.5 Pa·s。实验结果表明:熔炼过程产出合金品位为95.56%,合金直收率达到58.47%,渣中金属含量(Pb与Sb)小于1%(质量分数)。熔炼产物工艺矿物学研究发现,合金中主要物相为金属Pb、金属Sb以及少量Cu2Sb、FeSb2金属间化合物,炉渣主要由钙铁橄榄石、铁橄榄石组成,原料中锌主要以氧化锌形式进入渣相。

 

关键词: 脆硫铅锑精矿;富氧直接熔炼;渣型;金属直收率

Basic research of slag type in oxygen-enriched direct smelting of jamesonite concentrate
ZHANG Zhong-tang, DAI Xi

School of Metallurgical and Environment, Central South University, Changsha 410083, China

Abstract:Basic research of slag type in the oxygen-enriched direct smelting of the jamesonite concentrate was investigated. The FeO-SiO2-CaO-ZnO slag system was selected as the research object according to the composition characteristics of the slag. The phase diagram of FeO-SiO2-CaO-ZnO slag system was calculated and established through the thermodynamic software Factsage. The effects of temperature, Fe to SiO2 mass ratio, CaO to SiO2 mass ratio and ZnO content on the viscosity and fusing temperature of the FeO-SiO2-CaO-ZnOslag system were calculated. The results show that the fusing temperature of slag increases with increasing the Fe to SiO2 mass ratio and CaO to SiO2 mass ratio. The viscosity of the slag can be reduced with the increase of temperature. The viscosity of various slag composition is less than 0.5 Pa·s at 1250 ℃. According to the thermodynamics analysis results, the verification test is carried out, indicating that the metal grade is 95.56%, the metal recovery rate is 58.47%, and metal content (Pb and Sb) in slag is lower than 1% (mass fraction). The technological mineralogy of alloy and slag is studied and it is found that the main phases in the alloy contain metallic lead, metallic antimony and a small amount of Cu2Sb, FeSb2 intermetallic compounds. The slag is mainly composed of kirschsteinite and fayalite, zinc in the raw material is mainly oxidized into slag phase in the form of zinc oxide.

 

Key words: jamesonite concentrate; oxygen-enriched direct smelting; slag type; metal recovery rate

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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