The flotation method is based on the difference in the physical and chemical properties of the mineral surface, adding a flotation agent, and the useful mineral is selectively attached to the bubble to achieve mineral sorting. It is widely used abroad to select sand gold mines. The disadvantage is that the selection of materials with a diameter of more than 6 mm and less than 0.05 mm and flat gangue is inferior. The spiral concentrator has a simple structure, is easy to manufacture, has no transmission mechanism, and does not require power. The stratified heavy product is discharged by the discharge port of the inner groove bottom by the interceptor, and the light product is discharged by the end of the spiral groove. Large particles with a small density are distributed on the outer edge of the spiral groove, and fine particles having a large density are distributed on the inner edge of the spiral groove (right in the figure below). ![]() During the flow, the ore particles are stratified. Working principle: The slurry fed from above the chute flows downward along the chute in a spiral shape. It is characterized in that the entire chute is curved in a spiral shape in the vertical direction. The spiral concentrator/ spiral chute is a chute dressing equipment that utilizes the combined effects of gravity, friction, centrifugal force and water flow to separate the ore particles by specific gravity, particle size and shape. In addition to conventional gravity separators, China has developed new equipment such as belt chute, Ross chute, round jig, sand gold centrifugal washing unit, and achieved good effect in gold production. The main gravity separator equipment includes various types of spiral chutes, jigs and shaker tables. Generally, in the grinding and grading circuit, the jig and the spiral chute are combined with the shaker to recover the coarse gold in advance, which is preparation for subsequent flotation and cyanidation process and to obtain a qualified gold concentrate. However, for rock gold beneficiation, the gravity separation process is rarely used as a part of the gold extraction process. Therefore, gravity separation is the most important, most effective and economical method for placer/alluvial gold dressing. ![]() In the placer gold deposits, gold is usually in the form of monomeric natural gold, and its particle size is generally greater than 16 tons/m3, which is much different from the density of gangue. Gravity separation is one of the oldest and most common methods of gold selection. Mineral particles of different densities are subjected to hydrodynamic forces and various mechanical forces in the moving medium (water, air and heavy liquid), resulting in suitable loose delamination and separation conditions, so that different density of ore particles can be separated. The gravity separation method is based on the difference in the relative density of minerals (usually called specific gravity) to sort minerals. ![]() Low Intensity Dry Drum Magnetic SeparatorĪgitating chute is a new kind of gold and chip gold extraction machine…….
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