摘 要
新建磁鐵礦年處理原礦560萬噸選礦廠,給礦粒度1000—0mm。
南芬鐵礦主要礦物為磁鐵礦,磁性率在38%左右,采用單一磁選工藝。磁鐵礦分離粒度為0.03-0.15mm,石英為0.1-0.2mm,選用階段磨礦、階段選別流程。
工藝流程介紹如下:破碎為三段一閉路;磨礦為兩段閉路磨礦,一段磨礦分級的溢流給入一段大筒徑,精礦產物品位為44.0%、產率為59.82%、回收率為89.23%。粗精礦給入二段分級,二段分級溢流給入二段脫水槽,二段脫水槽精礦產物品位為55.5%、產率為87.45%、回收率為164.52%。隨后,給入二段磁選,經磁選后,粗精礦品位為60.50%、產率為78.52%、回收率為161.04%。磁選精礦接著給入細篩,篩下品位為65.0%、產率為36.83%、回收率為81.16%。篩下產物給入三段小筒徑,三段小筒徑精礦再給入四段大筒徑,四段大筒徑精礦經過過濾得到最終精礦,品位為68.0%、產率為34.71%、回收率為80%。選礦廠主廠房總共有12個系列,設計總投資為¥13862.9萬元,服務年限為40年,靜態投資回收期為2.57年。年精礦產量194.47萬噸,年銷售收入¥116682.85 萬元。
關鍵詞:磁選,階段磨礦,階段選別;
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;