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

作　　者：张祖刚 张若川 ZHANG Zugang;ZHANG Ruochuan(Baowu Resources Nanjing Meishan Mining Company;School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology)

机构地区：[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

出　　处：《现代矿业》2024年第1期129-133,139,共6页Modern Mining

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。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 

分 类 号：TD951[矿业工程—选矿]