Crushing and screening stage: In the crushing andscreening stage, adopted three stage and one closed circuit crushing andscreening flow. Using jaw crusher for coarse particles and cone crusher formedium and fine particles, the crushed particles’ size was -12mm;
Grinding and classification stage: The grinding processadopted two stage fully closed circuit grinding, and the grinding operation wasdivided into two series. The first stage grinding used grid ball mill and highweir spiral classifier to form a closed circuit grinding, and the second utilizedoverflow ball mill and high-efficiency cyclone group to form a closed circuitgrinding, with a grinding fineness of -200 mesh accounting for 85%;
SO2 manganese leaching stage: the qualified product ofgrinding and SO2 treated by high temperature entered together the cooling towerfor cooling and mixing. After mixing, the slurry entered double impellerleaching tank for continuous manganese leaching. With manganese leaching done,it was pumped into the thickener for continuous three-stage washing. Theoverflow from the second and third washing stage was returned back to washingoperation in previous stage. The overflow of washing operation from the firststage was the precious manganese sulfate liquid, which flowed into manganesesulfate storage tank, finally obtaining manganese sulfate crystals; the slurryafter the third washing stage entered silver leaching stage; Silver leaching stage: After washed in manganese leachingstage, the slurry entered the agitation tank, adding milk of lime for adjustment,then pumped it into double impeller leaching tank to continue adding the milkof lime to adjust slurry. After adjustment operation, let it enter double impellerleaching tank for leaching. The slurry was pumped into thickener to perform acontinuous three-stage washing operation. The overflow from the second andthird stage were returned to washing operation in the previous stage. Theoverflow from washing operation in first stage was the silver-containing preciousliquid, which flowed into precious liquid pool by itself; The silver-containing precious liquid was pumped intoplate and frame filter press for first stage purification and filtration, andthen pumped into the plate and frame filter press for the second stagepurification and filtration. The filter cakes of two stage purification andfiltration were pumped in rubber belt filter press for filtration. The filtrateand two-stage purified silver-containing precious liquid were all pumped intodeoxidation tower for deoxidation, and then pumped into plate and frame filterpress by pump added with zinc powder in order to obtain silver mud, which couldbe sent to smelting workshop for smelting; the replaced solution was consideredas lean liquid, which flowed into lean liquid pool by itself, and then could beused as return water to the washing stage;
Tailings treatment stage: Pumped into double impellerleaching agitation tank, the washed pulp in the silver leaching stage was cyanide-containingtailings. Cyanide-containing tailings and filter cake from belt filter press wereadded together with bleaching powder for neutralization, and then were pumped intailings pond.
Leaching agitation tank is a leaching equipment for cyanide leaching by referring the USA technical design.
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