Mongolia 1000tpd gold mine cyanidation gold extraction project

Project details

In the design of the dressing plant, Xinhai Mining aims to protect the interests of investors, minimize investment, and increase efficiency, while paying attention to the health and safety of operators. It emphasizes harmony with the environment, resource conservation and recycling, high efficiency and energy saving of single machines and machine clusters, and strives to achieve efficient recovery of gold ores and target metal minerals in each operation and the entire process.

Type crusher, after coarse crushing, it is sent to the circular vibrating screen by the belt conveyor for screening, and the screened objects enter the two-stage jaw crusher for secondary crushing; the 2-layer sieve and 3-layer sieve objects of the circular vibrating screen The vibrating feeder is sent by the belt conveyor to the three-stage cone crusher for fine crushing. The finely crushed products and the medium crushed products are sent to the two-stage circular vibrating screen for screening. The objects on the screen enter the rod screen and are screened again. After entering the crusher for fine crushing, the product and the undersize of the rod screen are sent by the belt conveyor to the buffer silo before the second stage of fine crushing, forming a closed circuit.

Grinding and grading stage: Xinhai adopted the It is a two-stage closed-circuit grinding process. The fine ore is transported by the belt conveyor to the wet energy-saving overflow ball mill for one stage of grinding. The slurry under the screen is pumped into the hydrocyclone for one stage of classification. The underflow returns to the ball mill for re-grinding to form the first stage. Section closed circuit grinding.

Gravity separation stage: One stage of classification overflow flows into the original centrifuge gravity separation, concentrate and another group of centrifuges in the original two-stage grinding-gravity separation equipment The machine concentrate is distributed together into the shaking table for selection, and the selected concentrate is granular gold, which can be directly smelted; the selected tailings and the centrifuge tailings enter a pump box together, and are pumped into a hydraulic cyclone. The flow device performs two-stage classification. The underflow and the cylindrical screen in the first stage of closed-circuit grinding flow into the wet energy-saving overflow ball mill for second-stage grinding. The product returns to the aforementioned pump box to form a two-stage closed-circuit grinding. .

Leaching stage:The second-stage graded overflow passes through the linear vibrating screen to remove wood chips, and then enters the thickener to complete the pre-leaching concentration operation. The bottom flow of the thickener is pumped through the slurry pump to the leaching tank to start the cyanide leaching operation. The sodium cyanide solution flows into several leaching tanks, and activated carbon is added to the last leaching tank. After the activated carbon absorbs gold, it is lifted by an air lifter and sent to the previous leaching tank. The gold-loaded carbon is separated through the carbon extraction screen, and the slurry is returned to the #2 leaching tank. The leached gold-loaded carbon can be desorbed and electrolyzed to obtain gold mud.

Desorption electrolysis-smelting:The gold-loaded carbon is sent to the desorption electrolysis system. The working temperature is about 150 degrees Celsius and the working pressure is about 0.5MPa. It can be produced in only 12-15 hours. Gold mud. The gold mud produced by electrolysis enters the smelting stage for smelting, and finally gold ingots are obtained.

Tailings dry discharge stage: After leaching, the slurry is separated by a safety screen and fine-grained gold-loaded carbon is then sent to the filter press in turn by the slurry pump. The ore is transported to the tailings yard via belt conveyor. After the filtrate is regularly added with bleaching powder in the sewage buffer tank, it can be returned to the high-level pool through the return pump or directly returned to the system for recycling.

Project results

The gold mine project processing plant design includes Ore processing and smelting, the final product is gold ingots with a gold grade greater than 95%. While providing design and construction services for the dressing plant, Xinhai Mining also pays attention to resource conservation and utilization and ecological environment protection. In this project, it provided a complete tailings dam dry stack and filtrate return water recycling system, which provided a complete system for the dressing plant. High-quality operations under a green production model create favorable conditions.