(中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083)
摘 要: 對脆硫鉛銻精礦富氧直接熔煉過程Fe元素行為進行研究，利用X射線衍射、掃描電鏡能譜、光學(xué)顯微鏡、電子探針、化學(xué)物相分析等手段對熔煉過程Fe元素走向及各相中賦存狀態(tài)進行表征。結(jié)果表明：熔煉中間過程Fe主要富集于精礦顆粒外圍FexSbyS復(fù)雜硫化物相，少量Fe以FeSb和FeS形式賦存于顆粒中心合金相；隨反應(yīng)進行，F(xiàn)e不斷向顆粒外圍遷移，熔煉終產(chǎn)物粗鉛銻合金中Fe以FeSb和FeSb2形式存在，絕大部分Fe氧化造渣以硅酸鐵(60.04%)和赤褐鐵礦(Fe2O3，37.34%，質(zhì)量分?jǐn)?shù))形式進入熔煉終渣。中間產(chǎn)物FexSbyS化合物的形成抑制銻硫化物氧化和揮發(fā)，其直接分解是鉛銻合金中存在Fe-Sb合金相的主要原因。
關(guān)鍵字: 脆硫鉛銻精礦；富氧；直接熔煉；鉛銻合金；Fe；賦存狀態(tài)
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:Fe element behavior of jamesonite concentrate during the oxygen-enriched direct smelting was studied. The trend of iron in the smelting process and occurrence state in each phase were characterized by X-ray diffraction, optical microscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy, electron probe and chemical phase analysis. The results show that the intermediate, partially oxidized jamesonite concentrate particle, is consisted of inner metal phase and outer FexSbyS sulfide phase. The oxidation and volatilization of antimony compounds is inhibited by the formation of FexSbyS phase. The iron is mainly enriched in the FexSbyS phase, while a little of FeS and FeSb alloy exist in the inner metal phase. As reactions proceeded, the iron is gradually transferred into the outer sulfide phase. And the iron was presented as FeSb and FeSb2 in the lead-antimony alloy. Most of the iron are presented in the form of 2FeO·SiO2 and Fe2O3 within the smelting slag. The presence of FeSb and FeSb2 phases in the lead-antimony alloy are mainly originated from the direct decomposition of FexSbyS phase.
Key words: jamesonite concentrate; oxygen-enriched; direct smelting; lead-antimony alloy; Fe; occurrence state
