浸出试验工艺条件对制备低磷铁精矿品位的影响-中国选矿选煤网.doc

浸出试验工艺条件对制备低磷铁精矿品位的影响 张晓刚1，张桂芳2，张宗华1，陈晓鸣1 (1.昆明理工大学国土与资源工程学院，云南 昆明 650093；2.昆明理工大学应用技术学院，云南 昆明 650093) 摘 要：对高磷赤褐铁矿进行了光谱分析、化学成分分析、铁物相的测定，以及矿石赋存状态研究。根据赤褐铁矿的性质，本研究选择不同酸分别进行了硫酸、盐酸浸出试验。对最佳浸出酸进行了酸浓度、浸出温度、液固比、浸出时间等不同工艺条件的试验研究。试验表明最佳工艺条件：H2SO4浓度以8.33％较为合适，浸出温度以60℃为宜，液固比以2.5：1为宜，浸出时间以15min为宜。得到铁品位为58.96％，磷品位为0.222％，铁回收率为75.08％。 关键词：浸出试验；工艺条件；品位；低磷铁精矿 中图分类号：TD913 文献标识码：B 文章编号：1004-4051(2010)04-0061-03 Effect of technological conditions of leaching experiment on grade of low-phosphorus iron ore in preparation process ZHANG Xiao-gang1, ZHANG Gui-fang2, ZHANG Zong-hua1, CHEN Xiao-ming1 (1.College of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China; 2.College of Applied Technology, Kunming University of Science and Technology, Kunming 650093, China) Abstract: Spectrum analysis, chemical composition analysis, determination of iron phase and the modes of occurrence on the ore of high phosphorus hematite-limonite had been studied by the paper. According to the character of hematite-limonite ore, leaching experiment were done by choosing different hydrochloric acid and sulfuric acid respectively. Different technology conditions of best leaching acid were studied in the concentration of acid, leaching temperature, liquid-to-solid ratio and leaching time. Best technology conditions were shown: the concentration of H2SO4 is 10 %, leaching temperature is 60℃, liquid-to-solid ratio is 2.5 : 1 and leaching time is 15 minutes, an ideal concentrate was obtained, which had the iron grade of 58.96%, the phosphorous grade of 0. 222%, and the iron recovery of 75.08%. Keywords: leaching experiment; technological condition; grade; low-phosphorus iron concentrate ore 目前，我国还有占总储量14.86％的高磷铁矿石没有开发利用。所以，研究高磷铁矿石降磷的工艺，对保障我国钢铁工业原料的供应具有十分重要的意义。近年来，国内外针对不同的矿石性质，进行了较为深入的铁矿石脱磷工艺研究。主要工艺有：反浮选、选择性聚团分选、酸浸、高梯度磁选、氯化焙烧-酸浸、微生物脱磷等。本研究所用云南某高磷赤褐铁矿，磷品位大于1％，磷主要以类质同象形式存在，少量以胶磷矿形式存在。该类矿石的选别难度较大，一直是选矿界的难题之一。该矿经过还原焙烧-磁选后，铁精矿铁品位为56.06 %，铁回收率87.81 %，磷品位1.26％。为了提高铁的品位