国外某混合铁矿石预选工艺优化试验研究
Experimental Study on Optimization of Pre-selection Process of a Mixed Iron Ore Abroad
张祖刚 1张若川2
作者信息
- 1. 宝武资源南京梅山矿业公司
- 2. 西安建筑科技大学环境与市政工程学院
- 折叠
摘要
国外某混合铁矿石全铁品位36.59%,磁性铁中铁含量26.85%,为高效回收该铁资源和降低入磨矿量,开展了预选工艺试验研究.研究结果表明,原矿破碎至-20 mm经干式磁选抛尾可获得产率88.08%、铁品位38.63%的精矿,精矿品位仅提高2.35个百分点;粗精矿经高压辊磨至-3 mm,经1粗1精弱磁选可获得产率63.02%、铁品位50.37%的精矿,精矿品位提高11.86个百分点;高压辊磨产品-3 mm样经弱磁选,弱磁精矿中-0.15 mm粒级产率39.48%、铁品位高达64.75%,筛分脱水可直接作为铁精矿;高压辊磨产品-3 mm样强磁精矿经隔渣,筛下产品溜槽重选可获得作业产率32.10%、铁品位62.60%的精矿.基于多碎少磨及节能减排的目标,推荐该混合铁矿石预选原则流程为原矿常规破碎—高压辊磨(-3 mm)—湿式磁选+SLon高梯度强磁选粗颗粒预选抛尾—筛分脱水—筛上粗粒精矿磨矿—筛下矿浆弱磁选+重选直接拿精矿的预选工艺.
Abstract
The total iron grade of a foreign mixed iron ore is 36.59%,and the iron content in magnetic iron is 26.85%.In order to efficiently recover the iron resources and reduce the amount of grinding,the pre-selection process test was carried out.The results show that the concentrate with yield of 88.08%and iron grade of 38.63%can be obtained by dry magnetic separationdiscarding tailing after crushing the raw ore to-20 mm,and the concentrate grade is only increased by 2.35 percentage points.The rough concentrate was ground to-3 mm by high-pressure roller mill,and the concentrate with yield of 63.02%and iron grade of 50.37%was obtained by one roughing one cleaning lowintensity magnetic separation,and the concentrate grade was increased by 11.86 percentage points.The high-pressure roller mill product-3 mm sample was subjected to lowintensity magnetic separation.The yield of-0.15 mm fraction in the lowintensity magnetic concentrate was 39.48%,and the iron grade was as high as 64.75%.Screening dehydration can be directly used as iron concentrate.The high-pressure roller mill product-3 mm sample high-intensity magnetic con-centrate was screened,and the product under the sieve was gravity separated by chute to obtain the concen-trate with operating yield of 32.10%and iron grade of 62.60%.Based on the goal of more crushing and less grinding,energy saving and emission reduction,it is recommended that the pre-concentration principle pro-cess of mixed iron ore is the pre-concentration process of raw ore conventional crushing-high pressure roller mill(-3 mm)-wet magnetic separation + SLon high gradient highintensity magnetic separation coarse parti-cle pre-concentration and tailings discarding-screening dehydration-screening onsize coarse concentrate in-to grinding-screening undersize pulp through lowintensity magnetic separation + gravity separationobtaining concentrate directly.
关键词
混合铁矿石/预选抛废/金属回收率/多碎少磨Key words
mixed iron ore/pre-selection and discarding/metal recovery rate/more crushing and less grinding引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据