Silver ore beneficiation process: flotation and cyanidation
Silver-bearing ore is mainly divided into two categories: silver-gold ore and lead-zinc-copper associated ore. Its silver production accounts for more than 99% of the total output. The gold ore beneficiation method mainly uses flotation or cyanidation. The main factor that determines the use of flotation or cyanidation is the composition of silver minerals. When the silver minerals are mainly silver and silver, flotation and cyanidation are all acceptable, but when the ore contains a large amount of cyanogenic minerals such as deep red silver, pale red silver, selenium and silver ore, only Can use flotation.
Lead-zinc-copper associated silver ores have different mineral compositions, symbiotic relationships, intarsia characteristics, and oxidation levels. The sorting results are also very different. However, flotation is commonly used in terms of beneficiation methods. method. In general, the recovery rate of beneficiation of lead-zinc-copper-associated silver ore is lower than that of silver-gold ore, generally between 50-70%.
Silver ore beneficiation case: XKJ processes 500 tons of silver ore processing equipment on delivery in Morocco
The 500 tons of silver ore processing equipment project for daily processing of 500 tons of silver ore by Henan Xingyang Mining Machinery Factory. It is reported that this project is an EPC project general contract project signed by Henan Xingyang Mining Machinery Factory and its customers in Morocco. As a well-known mineral processing equipment manufacturer in Henan Xingyang Mining Machinery Factory is responsible for the production of a complete set of ore processing equipment for Morocco customers, including: feeders, jaw crushers, fine jaw crushers, vibrating screens, ball mills, classifiers, Flotation machines, mixing tanks, etc.
Here are the main equipments for silver ore beneficiation:
Jaw crusher and fine jaw crusher
The Jaw Crusher is a crusher that consists of two jaw plates, moving jaw and static jaw, to simulate the two jaw movements of an animal and complete the material crushing operation. Divided into rough smashed and fine smashed, this time the silver ore beneficiation equipment uses the combination of jaw crusher and fine jaw crusher. Before the silver ore ore enters the ball mill for grinding, it needs to be broken through coarse and fine smashing. Only after reaching the requirements can you enter the ball mill.
The ball mill is the key equipment after the material is broken and then crushed. It is also the main equipment used by the beneficiation plant. After the broken silver mineral material, it enters the ball mill to grind. At the same time, the ball mill and the spiral classifier form a closed loop, and the qualified grinding fine The silver mineral material is discharged into the next process, and the unqualified material is returned to the ball mill to continue grinding.
Flotation machine is the key equipment for the entire flotation process. Common silver flotation machines include: SF, BF, KYF, XCF and other types of flotation machine equipment, its working principle, taking XCF flotation machine as an example: When the impeller rotates, the blades on the impeller are pumped to the ore and the medium ore. The slurry in the tank is sucked from the lower end of the impeller into the lower blades of the impeller from the bottom of the impeller. At the same time, the low pressure air is fed into the lower blade of the impeller through the distributor through the distributor. After the air is thoroughly mixed with the blades under the impeller, it is discharged from the periphery of the lower blades of the impeller. The discharged pulp and air mixture together with the pulp discharged from the upper blades enters the main body of the tank after being stabilized and oriented by the stator installed around the impeller. In the slurry, the mineralized bubbles rise to the surface of the tank to form a foam layer, part of the slurry in the tank is returned to the lower blade of the impeller for circulation, and the other part passes through the circulation hole in the tank wall and enters the lower tank to be selected again.
1. The crushing system adopts two sections and one closed road, which greatly reduces the grinding granularity of people and gives full play to the role of crushing to improve the processing capacity of grinding. “More broken and less grinding” is the energy saving and consumption reduction of ore dressing plant, reducing costs and improving the economic efficiency of enterprises. One of the effective measures.
2. Grinding a high degree of automation. Through automatic adjustment, it can timely and accurately adjust the amount of change, such as the amount of ore to be added, steel balls to be added, mine water, return sand water, ore discharge water, grinding concentration, etc. in accordance with the measured results to achieve the best Grinding effect, while using grinding automation control, can increase the mill's production capacity. The grinding process was changed from the past closed-circuit grinding to the second-stage closed-circuit grinding, and the second-stage grinding machine used a high-efficiency overflow ball mill to form a closed circuit with the cyclone group. The degree of dissociation of the grinding product is improved, and the quality of the second stage overflow is further improved.
3. The use of new flotation agents to improve the silver concentrate recovery.