Mineral Processing

gravity separation Equipment

Gravity separation is a important mineral recovery method and has been the main beneficiation sector used in gold mining plants, alternatively ahead of other processes such as flotation and cyanidation.
Gravity separation is an environmentally friendly beneficiation method that relies on water flow and gravity to separate target value minerals and gangues. It can recover gold from high grade gold particles, as well as the lower grade sulfide particles. The main gravity beneficiation equipment are jig, shaking table, spiral separator, gold concentrator.
Considering its low-cost, ease of operation, and eco-friendly nature, gravity separation techniques are widely used in mineral beneficiation practices.

Jig separator

Capacity: 1-20 TPH

shaking table

shaker table

Capacity: 10-20 t/d, up to 60 t/d

Gold Centrifugal Concentrator

gold concentrator

Capacity: up to 100 TPH

spiral separator

spiral separator

Capacity: 0.15-8 TPH

types of gravity separation equipment

Throughout the history of mineral processing, many different types of gravity separation devices have been used. The working principle of these gravity separation equipment is based on the density difference between valuable and gangue minerals.

More than a hundred years ago, the Wilfley shaker table was introduced, and is still used in gravity processing flow today. Due to its low capacity (less than 2 tph), the shaker is usually placed after the centrifugal concentrator, jig and spiral classifier, and final upgrade the mineral concentrate produced by former equipment, thus to further improve the gold recovery rate.

The density of the feed slurry is usually kept below 40% by weight to obtain a optimal performance, and the slurry is fed from the top corner of the table, and separated based on the difference in particle density and size.
particle segregation occur on the vibration action of table, which shake back and forth at right angles to the slope of the table.

The shaking of the shaker back and forth causes the combined effect of table vibration and water washing to cause fine weights to slide across the surface of the table, thereby reporting the concentrate to the uppermost part of the table edge. The lower-density gangue remains near the surface of the slurry, and with the help of washing water, it is washed across the shoals towards the tail channel under the table. An intermediate stream is also produced, which is usually recycled back to the grinding circuit for further release.
shaker table

The main parts of the jig are ragging screen, diaphragm and water storage valve.
Slurry of different density is fed to the top of the fixture in the direction of the ragging screen. Fluidized water through the screen directly upward to the jig bed, make the jig bed loose and separation. The diaphragm produces pulsating and expanding movements on the bed, causing light and heavy particles to separate.
The heavier coarse particles fall down to the concentrate through screen, while the lighter fine particles report to the tail in the form of overflow. The crushed material is located on top of the crushed material screen and is usually selected based on the density, which is between valuable minerals and gangue materials.

There are continuous and semi-continuous centrifuges, but more than 90% of the concentrators are semi-continuous concentrators.
Although the feed must be stopped periodically to clean and remove the concentrate from the drum, these batch processing units can continuously discharge the tailings. Usually the yield of concentrate is less than 0.1%, so it can produce extremely high-grade smelter products.
The Knelson concentrator and Falcon concentrator were introduced in the 1980s, are the most widely used of the two major centrifugal concentrators. with different capacity, and maximum recovery rate.

gravity separation equipment for sale

In order to maximize the effects of gravity, gravity separators with different recovery capacity should be considered.
Through a combination of gravity concentrators and or flotation, the mixed concentrate contains high amounts of gold and can now be treated easily with an expected leaching recovery rate of more than 95 per cent.

After decades of research and development, we have summarized and summarized experiences of various gravity concentration equipment and their applications.
The following are some representative applications
1. Jig: gold-containing sulfide, tin, mineral sand, chromite, iron, coal, etc.
2. Centrifuge: gold, copper, platinum, chromite, coal, etc.
3. Shaker: coal, chromite, manganese, etc.
4. Heavy medium separator: coal and minerals
5. Spiral concentrator: chromite, sand, coal, iron, etc.
6. Shaking table: chromite, gold, rare earth ore
7. Multi-gravity separator: chromite, coal, graphite, rare earth ore.

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