According to the results of beneficiation test, the flotation process of the silver ore is determined as follows:
Two stage and one closed circuit crushing and screening → one stage closed circuit grinding and classification → flotation (one roughing, two cleaning and two scavenging) mixed flotation process → mixed concentrate is concentrated, filtered and dehydrated to make filter cake → filter cake is sent to cyanidation workshop → filter cake is grinded to - 325 mesh, accounting for 85% → one time leaching and one time washing cyanogen residue filtering to obtain sulfur concentrate → sulfur concentrate is exported.
The first washing liquid is replaced with zinc powder to obtain gold and silver slime → pickling and drying → smelting gold and silver alloy and casting it into anode plate → electrolytic refining to separate gold and silver.
The slag is stockpiled, and then the gold and silver are recovered by crushing, grinding and gravity separation.
400 for primary crushing × 600mm jaw crusher, two sections ф 900 mm medium cone crusher, and 1250 × The 2500 mm double-layer vibrating screen forms a closed circuit crushing process.
Use a ball mill with a diameter of 1500 mm and a length of 3000 mm to ф 500mm single spiral classifier and hydrocyclone (controlled classification) form a closed circuit grinding process.
XCF type aerated stirring flotation machine and KYF type aerated stirring flotation machine are used. The two types of equipment can form a combined flotation unit, one as a suction tank and the other as a straight chute, to float mixed silver concentrate.
Thickener is used for the first stage dehydration, and filter press is used for the second stage dehydration. The water content of filter cake is about 20%.
First, three stirring tanks are used for one leaching, and then ф The precious liquid is obtained by washing the 6m thickener once, and the cyanide residue is filtered as sulfur concentrate for export.
The precious liquid obtained from the first washing is purified by the vacuum suction filter tank, deoxidized by the deoxidizer, and replaced with zinc powder to obtain gold and silver mud. The pickled and dried gold and silver slime is sent to the converter for smelting, and the gold and silver composite gold is refined, cast into anode plate, and sent to electrolytic refining to separate gold and silver.
Project results: The whole set of concentrator services reduced the production cost of the silver ore beneficiation project by 15%, 5% lower than the expected investment cost control of customers; After raw ore grinding, the silver recovery rate is up to 83.95% through gravity separation and flotation operations. The whole concentrator runs stably, the equipment quality is reliable, and the beneficiation indexes and economic benefits have reached the expectation.
