摘 要
新建磁铁矿年处理原矿560万吨选矿厂,给矿粒度1000—0mm。
南芬铁矿主要矿物为磁铁矿,磁性率在38%左右,采用单一磁选工艺。磁铁矿分离粒度为0.03-0.15mm,石英为0.1-0.2mm,选用阶段磨矿、阶段选别流程。
工艺流程介绍如下:破碎为三段一闭路;磨矿为两段闭路磨矿,一段磨矿分级的溢流给入一段大筒径,精矿产物品位为44.0%、产率为59.82%、回收率为89.23%。粗精矿给入二段分级,二段分级溢流给入二段脱水槽,二段脱水槽精矿产物品位为55.5%、产率为87.45%、回收率为164.52%。随后,给入二段磁选,经磁选后,粗精矿品位为60.50%、产率为78.52%、回收率为161.04%。磁选精矿接着给入细筛,筛下品位为65.0%、产率为36.83%、回收率为81.16%。筛下产物给入三段小筒径,三段小筒径精矿再给入四段大筒径,四段大筒径精矿经过过滤得到最终精矿,品位为68.0%、产率为34.71%、回收率为80%。选矿厂主厂房总共有12个系列,设计总投资为¥13862.9万元,服务年限为40年,静态投资回收期为2.57年。年精矿产量194.47万吨,年销售收入¥116682.85 万元。
关键词:磁选,阶段磨矿,阶段选别;
ABSTRACT
The newly-designed mineral processing plant has a capacity of 5.6 million tones which is from 1000 to 0 mm.
The valuable mineral of the ore is mainly magnetite, and the FeO / TFe is about 38%, so single magnetic separation is adopted. Since crystalline size of magnetite is0.03to0.15mm, and that of quartz is 0.01to0.2 mm, so stage-grinding and stage-concentration are employed.
Technical flowsheet is introduced as following: crushing is carried out through two stages with one stage closed-circuit. Grinding is two stage closed-circuit, and the overflow of first classifier is given into first big-drum-diameter magnetic separator. The grade, product ratio and recovery of concentrate are44.0%,59.82%,89.23% respectively. Then the concentrate is delivered to the second classification, its overflow into the second declaiming tank, the grade, product ratio and recovery of its concentrate are 55.5%, 87.45%, 164.52% respectively. After being separated by the second magnetic separator, the grade, product ratio and recovery of the concentrate are60.50%, 78.52% and 161.04% respectively. Then the product is fed to the fine screen. The grade, product ratio and recovery of the undersize product are 65.0%, 36.83% and81.16% respectively. And it is given to the third small-drum-diameter magnetic separator . Then it is given to the fourth big-drum-diameter magnetic separator and goes through the filter. The grade, product ratio and recovery of final concentrate are 68.0%, 34.71% and80% respectively.
There are 12 series in the concentration mill, and the total investment is ¥13862.9 million. The series life is 40 years, and the investment will be recovered in 2.57years. The annual concentrate output of the mineral processing plant is about 194.47 thousand tones, and the annual market income is ¥116682.85 million.
Keywords:magnetic,separation,stage-grinding,stage-concentration;