某高磷铁精矿酸浸降磷试验研究

摘要

Dephosphorization by acid leaching from Fe-concentrate obtained reduction roasting-magnetic separation was examined .In the Fe-concentrate ,phosphorus existes as the form of isomorphism in limonite ,and as the form of collophanite in ore .The test results show that under the conditions of tem-perature of 40 ℃ ,sulfuric acid concentration of 100 g/L ,ratio between liquid volume and solid mass of 2 .5∶1 ,reaction time of 25 min ,phosphorus in the concentrate is reduced effectively ,mass fraction of Fe and Phosphorus in Fe-concentrate is 58 .60% and 0 .256% ,respectively .%研究了用硫酸从还原焙烧-磁选工艺得到的高磷铁精矿中除磷。铁精矿中，磷主要以类质同象形式存在于褐铁矿中，少部分以胶磷矿形式存在。试验结果表明，在浸出温度40℃、硫酸质量浓度100 g/L、液固体积质量比2．5∶1、浸出时间25 min条件下，精矿中的磷得到有效降低，最终得到铁品位58．60％、磷质量分数0．256％的合格铁精矿。