(昆明理工大學(xué) 冶金與能源工程學(xué)院，昆明 650093)
摘 要: 研究了鋅置換渣的加壓酸浸過(guò)程Fe礦物相的浸出行為和浸出料漿過(guò)濾性能。利用OM、SEM-EDS、XRD、FTIR、XPS等檢測(cè)手段，對(duì)原料和典型浸出渣的成分及結(jié)構(gòu)進(jìn)行表征分析。結(jié)果表明：Fe在鋅置換渣中主要呈三價(jià)，以多孔疏松的ZnFe2O4形式存在；在低酸浸出渣中主要呈三價(jià)，是以外層包覆硅膠的密實(shí)ZnFe2O4形式存在；在高酸條件下，二價(jià)和三價(jià)共存，摩爾比約為27:23，主要以鐵硅氧化物(FeO-ySiO2)形態(tài)存在。加壓浸出可使原料中以ZnFe2O4形態(tài)存在的Fe大部分進(jìn)入溶液，促使渣中殘余Fe轉(zhuǎn)化為鐵硅氧化物形態(tài)，避免渣中膠質(zhì)Si、Fe共存、協(xié)同惡化浸出礦漿的過(guò)濾性能，并最終與渣中的Pb沉淀重構(gòu)，形成具有孔道結(jié)構(gòu)的物質(zhì)FeO-xPbO-ySiO2，有效改善了料漿的過(guò)濾性能。
關(guān)鍵字: 鋅置換渣；加壓浸出；鐵酸鋅；物相轉(zhuǎn)化；過(guò)濾性能
（Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:T the leaching behavior of ferrous phase and the filtration performance of leaching slurry of zinc replacement residue under oxygen pressure acidity leaching process were explored. The composition and structure of raw material and typical leaching residues under different sulfuric acid concentrations were analyzed and characterized in more detail by element analysis, OM, SEM-EDS, XRD, FTIR, XPS, and etc. The results show that, in the zinc replacement residue, the iron exists as trivalent ion in the form of porous ZnFe2O4, and in the low acid leaching residue it presents as trivalent ion in the form of dense ZnFe2O4 coated with silica gel, and in the high acid leaching residue the bivalent and trivalent ion coexisted (n(Fe2+):n(Fe3+)=27:23) in the form of a kind of complex silicon/iron oxide (FeO-ySiO2). The pressure leaching process can make most of iron elements, in form of ZnFe2O4, enter the solution, and at the same time the residual iron elements in the slag are transformed into FeO-ySiO2, and then the deterioration of the leaching slurry filtration performance can be avoided due to the absence of the coexistence of colloidal Si and Fe in the slag. Finally, the silicon/iron oxide with the lead precipitation is reorganized into a kind of material with pore structure (FeO-xPbO-ySiO2), which effectively improves the filtration performance of the leaching slurry.
Key words: zinc replacement residue; pressure leaching; zinc ferrite; phase transformation; filtration performance
