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1、内蒙古科技大学毕业设计说明书大杨庄选矿厂年处理量为40万吨原矿,给矿粒度为500~0mm,选厂设计为一次性平地建厂。大杨庄铁矿属于中硬度矿石,含泥量小,采用三段一闭路破碎流程;主要有用矿物是磁铁矿,且粒度不均匀,细粒选别粒度为0.2mm,采用阶段磨矿,阶段磁选工艺。原矿品位为29.07%。矿石经第一段磨矿分级溢流进入第一段磁选,磁选产品品位为45.8%,产率为55.62%,回收率为89.92%;粗选产品再经过地二段磁选,产品品位为49.50%,回收率为218.98%,产率为128.60%;此时大量的尾矿被甩
2、出,然后第二段磁选产品再进入第二段磨矿,之后对细粒磁铁矿进行选别;磨矿产品经过细筛选别,筛下产品品位为52.79%,产率为48.60%,回收率为88.26%;筛下产品经过第三段磁选,磁选产品品位为64.00%,回收率为85.84%,产率为38.99%;第三段磁选产品再经第四段磁选,精矿品位可达68.00%,回收率为85%,产率为36.34%,精矿经过滤机过滤,含水率小于10%。关键词:选矿磁选精矿品位阶段选别65内蒙古科技大学毕业设计说明书AbstractThecapacityoftheDayangzhua
3、ngdressingplantis400,000t/a,theplantisgoingtobebuiltonthegroundwhichisfiltandisputupatonetime.TheDayangzhuangironoreisthemediumdegreeofhardnessandcontainslittleslime,sowechoosethethreesectionofclosedcrushingcircults;Considerationofthemainlyvaluableminerali
4、smagnetiteandthesizeofmagnetiteparticlesarenotaverage,weadoptedstagegrindingandmagneticseparationtechnology.Thegradeofrun-of-mineoreis29.07%.Theoverflowproductofthefirstclassifierisgivenintothefirstmagneticandthedegreeoftheproductofthefirstmagneticseparato
5、ris45.8%,productratiois55.62%andrecoveryofconcentrateis89.92%;Thentheconcentrateisgivenintothemagneticseparatorandthedegree,theproductratioandtherecoveryofconcentrateofitsare49.50%,218.98%,128.60%respectively;Now,largeaquantityofgangueisseparated,thenprodu
6、ctofthesecondmagneticseparatorisgivenintothesecondmill,enteringintothestageofseparatingfinemagnetiteparticles.Theproductofmillisgivenintothefinescreenandtheproductoffinescreen′sdegree,productratioandrecoveryare52.79%,48.60%,88.26%respectively;thentheproduc
7、tofthefinescreenisgivenintothethirdmagneticseparatorandthedegree,theproductratioandtherecoveryofconcentrateofthethirdmagneticseparatorare64.00%,85.84%,38.99%respectively;afterthattheproductpassthroughthefourthmagneticseparatorandtheconcentrate′sdegree,prod
8、uctratioandrecoverycantobe68%,85%,36.34%respectively.Finely,theconcentrateistratedinthefilterandtheratioofcontainingwateris10%.Keywords:MineralprocessingMagneticseparationConcentratedegreestageseparation65内蒙古