The gangue in the quartz vein gold deposit is mainly quartz, whose content is generally more than 60%. According to statistics, the quartz vein type gold deposits account for more than 50% of the total gold deposits and gold reserves in China, are important gold resource.
Quartz vein gold deposits composition is simple, minerals mostly natural gold and silver gold ore, mainly medium and fine particles.
Gold beneficiation methods
Quartz vein gold ore beneficiation methods mainly include gravity separation, amalgamation, flotation, cyanidation and combination process like gravity separation – flotation, gravity separation – cyanide, flotation – cyanide.
Among them, the amalgamation method has been basically abandoned due to its environmental hazard;
The full mud cyanidation method has a high recovery rate, but the coarse gold will prolong the cyanide time, increase the amount of cyanide reagent, and reduce production efficiency. What’s more, due to the hazard of cyanide chemicals, its development is limited.
The single flotation process is simple, but the gold in the ore cannot be completely recovered. The coarse gold in the flotation tailings is lost. Therefore, the effective recovery of granular gold by gravity separation before flotation and cyanidation is of great significance to the efficient utilization of gold resources.
Knelson concentrator can effectively separate gold minerals and gangues, has high enrichment ratio, environmental friendliness and low production cost. It has been widely used in China’s quartz vein type gold ore beneficiation process.
The Knelson concentrator is an enhanced gravity separation equipment based on the centrifugal principle. The enrichment cone produces a high-magnitude gravitational field at high speeds, and the difference in gravity between minerals of different densities is multiplied, making the separation between light and heavy minerals easier.
What is the best substitute for the Knelson concentrator?
Based on the traditional centrifugal concentrator equipment, the Knelson concentrator has successfully solved the problem of ore layer tight packing and low sorting efficiency. The gold beneficiation ratio is up to 1 000 – 5,000.
Knelson concentrator has the following advantages:
(1) Chemical-free, environmentally friendly;
(2) Good separating effect, high beneficiation ratio, high gold grade.
(3) Automation and stable;
(4) High processing capacity and high production efficiency;
Knelson concentrator flotation beneficiation process
The experimental results show that when the grinding fineness is -0.074 mm, 84%, the recovery rate of the combination process of gravity separation – flotation is 91.40%, which is 3.09% higher than that of the single flotation process.
The Knelson gold concentrator has great advantages in the gravity separation of quartz vein type gold ore and has been applied to the beneficiation process by more and more gold plants. Among them, the most widely used is the Knelson concentrator flotation beneficiation process. The use of Knelson concentrator to recover the natural gold in the gold mine in advance effectively avoids the loss of coarse gold in the flotation tailings and increases the concentrate grade.
The process is environmentally friendly, has high recovery efficiency and good adaptability, and is suitable for most quartz vein type gold mines.