(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 在查明鋅浸渣工藝礦物學(xué)的基礎(chǔ)上，采用還原焙燒將鐵酸鋅分解為氧化鋅和磁性氧化鐵，再通過(guò)磁選的方法回收鐵，達(dá)到鋅、鐵分離的目的。實(shí)驗(yàn)考查了焙燒溫度、焙燒時(shí)間、還原劑用量對(duì)鐵酸鋅分解率、鐵回收率和鐵品位的影響。結(jié)果表明：在焙燒溫度為950 ℃、焙燒時(shí)間為1 h及還原劑添加量為10%和5%的條件下，鐵酸鋅分解率達(dá)到72.05%，鐵回收率可達(dá)到91.79%，精礦中鐵的品位為50%左右。焙燒及磁選過(guò)程中顆粒的團(tuán)聚包裹是鐵精礦品位不高的主要原因。
關(guān)鍵字: 鋅浸渣；鐵酸鋅；還原焙燒；磁選；鐵回收
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Based on the process mineralogy, the zinc ferrite was decomposed into zinc oxide and ferroferric oxide by reduction roasting, and then recovery iron by magnetic separation. The effects of roasting temperature, roasting time and usage of reducing agent on the decomposition rate of zinc ferrite and recovery rate of iron were investigated. The results show that the decomposition rate of zinc ferrite reaches 72.05% and the recovery of iron reaches 91.79% after roasted at 950 ℃ for 1 h in 10% or 5% reducing agent. The iron concentrate grade only reaches 50%. The agglomeration of particles in the process of roasting and magnetic separation leads to the lower grade.
Key words: zinc leaching residue; zinc ferrite; reduction roasting; magnetic separation; iron recovery
