NEWS

3. Gold separation with chute
The main equipment of gold separation with chute is spiral chute, it is the use of ramp flow separation equipment, materials with water by the gravity of mineral grain through the bottom of the channel under the action of the joint force of friction, the settlement of particles according to the proportion of different areas of the groove, the proportion of small particles was taken away by the water, leaving than major ore grain, sorting is completed. The chute is an intermittent operation. When the concentration deposit at the bottom of the chute reaches the moving degree, it is necessary to stop feeding the ore and clear the concentrate before the operation.

The spiral chute is suitable for the treatment of small and fine materials with low mud content, with the particle size range of 0.6~0.03mm, with the characteristics of simple structure, large handling capacity and low comprehensive cost.

4. Heavy medium separation
Heavy medium separation is taking ores, crushed into a certain size, to the density of the fluid than water (that is heavy medium). According to the Archimedes' principle of buoyancy, density is less than medium ore particles will float, and density is greater than medium ore particles will sink. So we respectively intercept two products, realizing the heavy medium ore dressing.

This separation method is mainly determined by the density of mineral particles, and the particle size and shape of mineral particles have little influence, so the separation accuracy is relatively high. The mineral with small density difference (such as 0.1g/cm3) can be separated. The particle size range of selected materials can be very wide, and the treatment state force is large.

5. Hydraulic or wind classification
When the broken materials settle in the air or water, the particles of different particle size and shape have different settling speed due to the different resistance of the medium they are subjected to. At this time, they can be separated according to the particle size. This kind of reselection operation is called classification.

Hydraulic classification is a process in which a wide class of particles is divided into two or more narrow classes according to the different sedimentation rates of ore particles in water. In the process of hydraulic classification, water medium has three kinds of motion: vertical, nearly horizontal and rotary motion.

Due to the relatively complex process and low efficiency of wind power mineral processing, its application has a great limitation, mainly used for dry closed circuit grinding, fine particle classification before dry separation, dry dust collection, etc.. Because the density of air medium is small, the separation effect is not high. The selected particle size is generally 1.5-0.005mm, and the strength of individual fibers and sheets can be larger, such as mica, the maximum particle size can be up to 3mm.

The above five methods are only used for gold ore (placer gold) whose monomer is dissociated. General form joint process and other processes, such as gravity separation - flotation joint gold separation technology, to assist in gold separation, in grinding and classification circuits using the jig, spiral chute and shaking table, easy to recycle the solution from the coarse particles of gold, thought and subsequent flotation cyanide process to create better conditions, such as the final gold index can be increased and the total recovery of gold.

In production practice, gravity separation method is favored by concentrators because of its advantages such as low production cost, simple equipment structure, less pollution to the environment and suitable conditions. In the practice of the mill plant, the determination of gravity separation method should be considered the ore properties, the requirements, production conditions, the budget of the investment and other factors. In the gold ore dressing, choose re-election need according to the nature of gold mine, is recommended to process choose when the choice of experiment, analyzing the gold mine, according to the test to determine whether a suitable selection of re-election process, or through a test to determine which is more suitable for re-election process, through beneficiation test process can obtain a more ideal choice gold.