As the residue of ore dressing, there are still some unfinished gold ore particles in the gold tailings. In order to make full use of resources and reduce environmental impact, reselection technology can be used. Generally, the density difference between mineral particles can realize the effective recovery of gold particles. The following will introduce four kinds of gold tailings gravity separation technologies, namely: shaker gravity separation, spiral chute separation, heavy medium separation and centrifugal separation.
(Shaking table gravity separation technique)
A shaker is a device that layers out the mineral particles by vibration. Shaker gravity separation is a method of mineral separation according to the pulsating water flow according to the density difference. During the beneficiation process, the table is shaken by vibration, and the ore particles are gradually layered. Heavier mineral particles move along the grooves at the bottom of the table, while the lighter impurities stay in the flat area between the grooves. This fractionation effect can facilitate the separation of gold mine particles from impurities.
The effect of shaking table separation is related to mineral particle size, particle shape and table regulation. In actual production, the inclination angle and vibration frequency of the shaking table can be adjusted to achieve effective separation of different particle size and density difference minerals. Large inclination angle and appropriate vibration frequency can facilitate the separation of heavy minerals. Shaker gravity separation method can be suitable for treating coarse grain gold tailings, and is widely used in small and medium-sized concentrators, which is a relatively simple and economical separation method.
(Spiral chute gravity separation technique)
The spiral chute consists of a spiral channel and a feed end, and when the gold tailings enters the spiral channel, the centrifugal force due to the helical shape and rotational motion layers out the particles at different densities. Heavy mineral particles will be pushed to the outer edge of the channel, and light impurities will remain in the center of the channel, which helps the separation of gold particles from the impurity minerals. This beneficiation technology is suitable for processing gold tailings with fine and medium particles, especially the minerals with large density difference, and the gold particles with large proportion have better recovery effect.
When the spiral chute is used for separating, the shape and angle of the spiral will affect the gravity separation effect, so the appropriate adjustment of the spiral shape and angle during the separation can improve the mineral processing index. But at the same time, in order to ensure the working efficiency of the spiral chute, the feed speed and rotation speed are controlled, and the channel is cleaned regularly.
(Heavy medium separation technique)
Heavy medium separation technology is widely used in the treatment of gold tailings. It is a wet separation technology, which mainly uses the difference of mineral particle density to suspend gold sand tailings in a liquid medium with a specific density, such as heavy medium suspension. During separation process, due to the high density of gold mine particles, it will sink into the medium. Less dense impurities will float on the liquid surface. In order to improve the separation effect of gold mine particles, the medium density can be adjusted appropriately. In general, gold mine particles with higher density can be recovered efficiently. After separating, the impurities floating on the liquid level need to be treated and recovered through the steps of discharging and cleaning.
Heavy medium separation technology can be used for both coarse and fine-grained gold tailings. Because he can separate both large particles and small particles. However, it has a good separation effect for the minerals with a large density difference. When applying heavy medium separation technology, attention should be paid to density selection, mixing speed, separation time, etc.
(Gold ore tailings processing plant)
The centrifugation beneficiation technology is mainly used to separate the mineral particles of different densities. The ore particles produce centrifugal force in the centrifugal cylinder. The gold particles with large specific gravity will move along the outer edge of the cylinder, and the impurities with light specific gravity will remain in the central area. This stratification effect can effectively separate the gold mine particles, and the appropriate speed adjustment can optimize the beneficiation effect. This technique is mainly suitable for handling fine particles.
The above contents are four kinds of gold tailings, which can be used separately or in combination in the beneficiation process of gold ore tailings. The specific process should be determined according to the characteristics and production requirements of gold tailings. The reseparation technology is often affected by factors such as particle size, ore characteristics and specific gravity, and technical parameters of gravity separation equipment. In production, the parameters of the equipment should be optimized according to the actual situation, so as to be improved, so as to improve the recovery effect of gold particles and improve the economic benefits of the ore dressing plant.
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