What is Gravity concentration

Gravity separation is the separation of two or more minerals of different specific gravity by their relative movement in response to the force of gravity and one or more other forces (such as centrifugal forces, magnetic forces), one of which is resistance to motion (drag force) by a viscous medium such as heavy media or water.

Gravity separation is one of the oldest technique in mineral processing but has seen a decline in its use since the introduction of methods like flotation, classification, magnetic separator and leaching. Gravity separation dates back to at least 3000 BC when Egyptians used the technique for separation of gold.

There are several methods that make use of the density differences of particles-

•     Heavy media or dense media separation (these include, baths, drums, larcodems, dyana whirlpool separators, and dense medium cyclones)

•     Shaking tables, such as the Wilfley table[4]

•     Spiral separators

•     Reflux Classifier

•     Jig concentrators are continuous processing gravity concentration devices using a pulsating fluidized bed.

•     Centrifugal bowl concentrators, such as the Knelson concentrator and Falcon Concentrator

•     Multi gravity separators (Falcon Concentrator, Knelson, Mozley (Enhanced Gravity Separator), Salter Cyclones (Multi-Gravity Separator) and the Kelsey Jig)

•     Sluice box

These processes can be classified as either dense medium separation or gravity separation. The difference between the two that gravity separation does not use a dense medium to operate, only water or air. Dense medium separation can be performed with a variety of mediums. These include, organic liquids, aqueous solutions, suspensions in water and suspensions in air. Of these, most industrial processes use suspensions in water. The organic liquids are not used due to their toxicity and difficulties in handling. The aqueous solution as a dense medium is used in coal processing in the form of a belknap wash and the suspension in air is used in water-deficient areas, like china, where sand is used to separate coal from the gangue minerals. The dense medium separation is also classified as absolute gravity separation as the sinks and the floats travel in different directions. The gravity separation is also called relative gravity separation as they separate particles due to their differences in the magnitude of the particle response to a driving force.

Stone gold separator line - JXSC mine machinery factory

Stone gold separator, Our factory also use crusher first, then ball mill second, then can use shaking table, or centrifugal.

About our crusher output size 20mm, then to ball mill, output size 0.4-0.074mm, then to centrifugal or shaking table.

Our factory have different kind and model of crusher, ball mill, centrifugal and shaking table, of course have gold detect depth, gold smelting furnace.

If you need more information pls check: www.miningjxsc.com

Deck Vibrating Screen

The Deck Vibrating Screen is one kind of feeding machine in the mining project. It is most widely used and high effective feeding machine. It is widely used in the crushing and screening equipment in ore-dressing, building materials, silicate and chemical industry.

The Deck Vibrating Screen can be made with grizzly, so as can sieve some big size particles when feeding, and can be with water pipe around to wash the material at the same time.

The main parts of this machine include: electic motor, spring, slot, frame, grizzly. Its capacity can be from 100T/H to 400T/H. with stable vibration, reliable operation, long life time, easy maintain.

The alluvial gold ore / alluvial coltan ore/ alluvial tantalum-niobium ore/ placer coltan/ sand iron ore processing plant will usually use the Deck Vibrating Screen to feed the washing machine. Below pictures are this machine in the 100T/H alluvial gold washing plant for Ghana customer and 100T/H tantalum-niobium ore processing plant for Uganda customer.

Gold Ore Spiral Chute application

This Gold Ore Spiral Chute is a combination of benefits of a spiral concentrator, a spiral chute, a table concentrator, and a centrifugal ore separator. It is an ideal tool for mining and mineral processing applications, especially on riversides, strands, beaches, and river ways. Our spiral chute comes with reasonable structure, simple installation, easy operation, high capacity, light weight, low noise, good rust, moisture and corrosion resistance. In addition, it is fully applicable to materials of different feeding granularity, density, and grades.

Spiral chute is suitable for fine materials of 0.3-0.02 mm granularities, such as iron ore, ilmenite, chromite, pyretic, zirconite, rutile, monazite, xenotime, tungsten ore, tin ore, tantalum ore, columbite ore as well as other nonferrous metal, rare metal and nonmetal minerals of different proportions.

The sand pulp is first send to the two inlets of the spiral chute. After added water for appropriate pulp density, the pulp swirls down and generates a centrifugal force which separates the ores and sands. The ore concentrate flows into the hopper and is collected through a pipeline. The tailings are discharged by a sand pulp. Thus, the whole mineral process is finished.

Magnetite ore magnetic separator - JXSC mine machinery factory

                        

                        

Magnetite ore magnetic separator is suitable for wet magnetic separation of materials such as magnetite, calcined ore, etc. and it can remove the iron in the coal, non-metal and construction industries. The magnetic system is made from high quality ferrite magnetic materials and /or rare earth magnet steel. On the shell surface, the magnet intensity is 100-600mt. The wet type permanent magnet cylindrical separator is commonly used for iron ore separation. It is suitable for separating materials with high magnetism. In recent years, it has been used as concentrating equipment in place of magnetic dewatering cell.

Magnetite separator mainly consists of such four parts as cylinder, magnetic system, cell and transmission parts.

Latest 3 sets gold centrifuge concentrator have been delivery to Africa

Latest 3 sets of gold centrifuge concentrator have been delivery to our customer’s mine site in Africa. These centrifuge concentrators will be used in alluvial gold processing line 150tons/hour capacity, Cooperate with gold scrubber and sluice box.

This gold concentrator is kind centrifugal concentration equipment. It can be used not only for placer gold mining, but also for hard rock mining to recover the natural gold, replacing amalgamation. It is also used to recover gold from the tailings.

There are many applications where the gold concentrator is of particular value and cannot be equaled for economical and efficient performance. They are effective in processing precious and base metal, rare metal and non-metallic minerals.

Mineral separating gold shaking table

 

Gold shaking table has been widely used in the rare metal dressing plant, such as scheelite, wolfram, tin ore, tin ore, placer mine, tantalite, columbite and etc. And also some times it been used to concentrating manganese ore and iron ore.

It is wet type mine machinery, which working by gravity. Compare with traditional tool, JXSC brand shaking table have below advantages:
1). made by 6s firber glass material;
2). steel structure support, easy to install and move to other place;

3). high recovery ratio, as usual more than 90% recovery ratio.