Effect of Fe/SiO2 and CaO/SiO2 mass ratios on metal recovery rate and metal content in slag in oxygen-enriched direct smelting of jamesonite concentrate  

Fe/SiO2和CaO/SiO2质量比对脆硫铅锑精矿富氧直接熔炼过程合金直收率及渣中金属含量的影响（英文）

作　　者：Zhong-tang ZHANG Xi DAI 张忠堂;戴曦(中南大学冶金与环境学院)

机构地区：[1]School of Metallurgical and Environment,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第2期501-508,共8页中国有色金属学报（英文版）

基　　金：Project(51474248)supported by the National Natural Science Foundation of China

摘　　要：The oxygen-enriched direct smelting of jamesonite concentrate was carried out at 1250℃by changing the slag composition.The effects of Fe/SiO2 and Ca O/SiO2 mass ratios on the metal recovery rate as well as metal content in slag were investigated.Experimental results indicated that the metal(Pb+Sb)recovery rate was up to 88.30%,and metal(Pb+Sb)content in slag was below 1 wt.%under the condition of slag composition of 21-22 wt.%Fe,19-20 wt.%SiO2 and 17-18 wt.%Ca O with Fe/SiO2 mass ratio of 1.1:1 and Ca O/SiO2 mass ratio of 0.9:1.The microanalysis of the alloy and slag demonstrated that the main phases in the alloy contained metallic Pb,metallic Sb and a small amount of Cu2 Sb and Fe Sb2 intermetallic compounds.The slag was mainly composed of kirschsteinite and fayalite.Zinc in the raw material was mainly oxidized into the slag phase in the form of zinc oxide.通过改变渣相组成研究脆硫铅锑精矿在1250℃时的富氧直接熔炼过程。探讨Fe/SiO2和CaO/SiO2的质量比对脆硫铅锑精矿富氧直接熔炼过程中合金直收率及渣中金属含量的影响。结果表明:在Fe/SiO2质量比为1.1:1、CaO/SiO2质量比为0.9:1、渣组成为(21-22)%Fe、(19-20)%SiO2和(17-18)%CaO(质量分数)的条件下,熔炼过程合金直收率达到88.30%,渣中金属(Pb+Sb)含量低于1%(质量分数)。合金及炉渣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、Fe Sb2金属间化合物。炉渣主要由钙铁橄榄石和铁橄榄石组成,原料中锌主要以氧化锌形式进入渣相。

关 键 词：jamesonite concentrate metallurgical process intensification slag type PYROMETALLURGY oxygen-enriched direct smelting 

分 类 号：TF812[冶金工程—有色金属冶金]