3 Major Gold Gravity Separation Methods

xinhai gold separation processing plant displayed

Gravity separation is one of the commonly used methods for gold beneficiation. It uses different specific gravity of materials and different settling speeds in the medium to carry out stratified separation. Generally, in placer gold mines, gold mostly exists in the form of single natural gold, which has a large density difference with gangue. There are many kinds of gravity separation methods, such as jig gravity separation, shaker gravity separation, chute gravity separation, screw gravity separation, centrifugal gravity separation and wind gravity separation. In gold ore beneficiation, the commonly used gravity separation gold separation methods are jig gold separation, shaking table gold separation and chute gold separation.

The main equipment for gold jigging is a jigger. The jigging process is to mix mineral particles of different specific gravity, and stratify according to specific gravity in a vertically moving variable-speed medium flow. Minerals with small specific gravity are located in the upper layer, and minerals with large specific gravity It is located in the lower layer, and the layered materials are discharged separately by the action of machinery and water flow.

Jigging gold is suitable for sorting coarse-grained mineral particles (mineral raw materials of any particle size except fine materials). Under the premise of body dissociation, the lower limit particle size can reach 0.04mm, the process operation is simple, the equipment processing capacity is large, and the application effect is very good in roughing gold ore.

jig used for gold separation in xinhai plant

The main equipment for the shaker gold separation is the shaking table, which is the equipment for separation in the horizontal medium flow. The transmission mechanism is used to drive the table surface to do longitudinal reciprocating motion, and the rush flow and the table surface differential motion, and the ore particles are reciprocating. During the movement, it undergoes the layering action perpendicular to the table surface and the separation action parallel to the table surface, so that materials of different particle sizes are discharged from different sections of the table surface to realize sorting. Shaking table gold selection is suitable for processing and sorting minerals with fine particle size. According to the particle size of the ore, it can be divided into three types: coarse sand table, fine sand table and ore mud table. The coarse sand table is suitable for sorting materials with a particle size of 2.0 The ore particles between mm and 0.5mm, the fine sand table is suitable for processing the ore particles with the material size range of 0.5-0.074mm, and the ore mud table is suitable for processing the ore particles with the material size of 0.074-0.037mm. The feeding particle size range of shaking table gold dressing is generally between 3mm-0.019mm, the gold dressing is stable and reliable, the ore belt distribution is clearly visible, the rich ore is higher than other dressing methods, easy to manage, and the required ore can be sorted at one time.

shaker used for gold separation in xinhai plant

The main equipment for chute gold separation is spiral chute, which is a kind of equipment that uses inclined water flow for sorting. The material uses the combined force of water flow, mineral gravity, and friction between ore particles and the bottom of the tank to make the ore particles settle in the tank according to specific gravity. In different areas in the interior, the ore particles with a small specific gravity are taken away by the water flow, leaving behind the ore particles with a large specific gravity, that is, the separation is completed. The spiral chute is suitable for processing fine-grained materials with low mud content, the material size range is 0.6-0.03mm, the structure is simple, the processing capacity is large, and the comprehensive cost is low.

shaker used for gold separation in xinhai plant

The above three methods of gravity separation gold separation are only used for gold ore (placer gold ore) with monomer dissociation. For vein gold minerals, gravity separation process is rarely used alone. Generally, a combined process is formed with other processes, such as the gravity-floating combined gold extraction process, and gravity separation is used to assist gold extraction. In the grinding and classification circuit, the jig, spiral chute and shaking table are used to cooperate, and the easily dissociated gold is recovered first. Coarse-grained gold can create better separation conditions for subsequent flotation and cyanidation processes, and can effectively improve the gold ore index and the total gold recovery rate. In gold ore beneficiation, the selection of gravity separation depends on the properties of the gold ore. It is recommended to conduct a beneficiation test before the process selection, analyze the properties of the gold ore, and determine whether the gravity separation process is suitable for selection through the test, and obtain an ideal gold beneficiation process.