Gold extraction technology of primary gold mine

Gold ore processing and production technology mainly includes three processes: crushing, grinding and beneficiation. In the process of crushing, three-stage closed-circuit crushing is the most suitable modern crushing method for crushing high-hardness gold ore, which can complete the work of ore crushing and partial dissociation, thus improving the subsequent grinding efficiency; In the process of grinding, two-stage and one-closed circuit grinding is an efficient grinding process, which can make gold ore more fully ground; Among the mineral processing technologies, the successful new technologies in recent years mainly include gravity separation, mixed mercury separation, cyanidation and flotation.

The first stage: crushing and screening

Bulk gold ore is sent to jaw crusher or mobile jaw crusher station (primary crushing) by vibrating feeder through silo for coarse crushing; The coarse-crushed gold ore is screened by vibrating screen and sent to single-cylinder hydraulic cone crusher (secondary crushing) by belt conveyor for medium crushing; The medium-crushed gold ore is sent to a multi-cylinder hydraulic cone crusher for fine crushing.

The second stage: grinding

The 0- 12mm gold powder screened by the vibrating screen is evenly sent to a ball mill for grinding, and screened by a spiral classifier, and the unqualified gold powder is sent to the ball mill for further grinding;

The third stage: magnetic separation

Sending the gold powder meeting the mineral processing requirements into a flotation machine for strong flotation to remove impurities;

The fourth stage: drying

Sending the obtained gold powder into a dryer for drying to obtain refined gold powder.

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2. The latest research on gold extraction technology from gold ore.

Cyanide extraction of gold has been widely used and has always occupied a dominant position. However, due to its high price, high toxicity and environmental pollution, especially when it comes to refractory gold mines, its economic indicators and technical effects are questioned and challenged. Therefore, it has become an urgent task to improve cyanidation and make it more widely used in refractory gold mines. In order to solve this problem, people put forward the oxidation pretreatment method of refractory gold ore.

The basic characteristics of refractory gold ore in gold production line and gold production process are as follows: the particle size of gold and its carrier minerals is fine, and gold is wrapped in pyrite, arsenopyrite and antimony sulfide or embedded in sulfide mineral crystals in fine particles or microscopic forms; There are many harmful impurities such as arsenic and organic carbon, which are closely related to gold. Since the mid-1970s, such gold deposits have been discovered in Guangxi, Yunnan, Guizhou, Sichuan, Anhui, Gansu and Northeast China, with proven reserves of about 700 tons and prospective reserves exceeding 1000 tons.

3. Method

1) chlorination leaching method of gold ore aqueous solution

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2) cyanide leaching-ion exchange resin adsorption method

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3) preparation method of rare earth gold ore-gold thermal reduction method

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