The Mongolia 1,000t/d gold mineral processing plant was an EPC+M+O project. Xinhai worked to achieve high recovery of gold and other valuable minerals by cutting costs and maximizing benefits and attach great importance to workers’ safety, environmental protection and energy conservation.
crushing and screening stage
Three stages and one closed circuit crushing and screening process: jaw crusher is used for coarse crushing. After coarse crushing, it is sent to a circular vibrating screen by a belt conveyor for screening I, and the material on the upper screen (+30mm) enters another jaw crusher. Secondary crushing; the second layer sieve screen (15-30mm) and the third layer screen screen (8-15mm) are transported by the belt conveyor to the buffer mine for buffering, and then fed into the cone crusher by the vibrating feeder. Fine crushing II, fine crushing II products and medium crushing products are sent to the circular vibrating screen by the belt conveyor for screening II, the oversize (+8mm) enters the bar screen for re-screening, and the oversize (+20mm) enters the crusher Carry out fine crushing I, and the product and bar screen undersize (8-20mm) are transported by belt conveyor to the buffer silo before fine crushing II, forming a closed circuit. The bottom sieve (-8mm) of screening I and screening II is the qualified material in the crushing and screening stage.
Grinding and grading stage
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 grinding, the sifted pulp (-3mm) is pumped into the hydrocyclone for the first-stage classification, and the underflow returns to the ball mill for further grinding. Grinding to form the first stage of closed-circuit grinding.
Gravity separation: The first stage of classification overflow flows into the original centrifuge for gravity separation, and the concentrate and another group of centrifuge concentrates in the original two-stage grinding-gravity equipment are distributed into the shaker for selection. The selected concentrate is particle gold, which can be directly smelted; the selected tailings and the centrifuge tailings enter a pump box together, and the pump is driven into the hydrocyclone for the second stage classification. The material on the cylindrical screen in the closed-circuit grinding will flow into the wet energy-saving overflow ball mill for the second-stage grinding, and the product will be returned to the aforementioned pump box to form the second-stage closed-circuit grinding.
Leaching: The second-stage classification overflow removes the sawdust through a linear vibrating screen (chip removal screen), and flows to the original thickener for pre-leaching concentration. The overflow can be returned to the system as return water for reuse. The underflow of the thickener (concentration is about 40-45%) is pumped by the slurry pump to the leaching tank to start the cyanidation leaching operation. In order to facilitate the flow of the pulp, the installation height of the previous leaching tank is greater than that of the next leaching tank. The sodium cyanide solution flows into several leaching tanks, and the activated carbon is added to the last leaching tank. After the activated carbon adsorbs gold, it is lifted by the air lift and sent to the previous leaching tank. The gold-loaded carbon is separated by the carbon extraction screen, and the pulp is returned to the 2# leaching tank. Gold mud can be obtained by desorption and electrolysis of the leached gold-loaded carbon.
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. Gold mud can be produced in only 12-15 hours. The gold mud produced by electrolysis enters the smelting stage for smelting, and finally obtains gold ingots.
Tailings dewatering stage
After leaching, the pulp is separated by a safety screen to separate the fine-grained gold-loaded carbon, and then sent to the filter press by the slurry pump in turn, and the filtered tailings are transported to the tailings yard by the belt conveyor. After the filtrate is regularly added with bleaching powder to the sewage buffer tank, it can be pumped back to the high-level pool by the return pump or directly back to the system to realize recycling.
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