The Basic Principle and Equipment of Spiral Chute Beneficiation

The Basic Principle and Equipment of Spiral Chute Beneficiation

Spiral chute beneficiation is an ore beneficiation method using the different state of motion of the ore particles in the water flow moving in the bevel. Here the experts of Hongxing Machinery will give a brief introduction to the basic principle and equipment of spiral chute beneficiation.

Spiral chute is the earliest ore beneficiation equipment. In ancient times, people used elutriation method to separate the heavy sand minerals, and the tool used was original spiral chute. Some coarse grain gulch-gold spiral chutes and stream tin chutes are still used today. However, modern spiral chute beneficiation has been developing towards mechanization and automation, and movement means of the ore current are various.

According to the granularity of the ores to be processed, the spiral chute can be divided into three types: coarse grain chute, ore sand chute and slurry chute. The main advantages of spiral chute include simple structure, low investment and production cost and the coarse and medium grain chute has high processing capacity. The disadvantage of spiral chute is low separation precision, for this reason, it is suitable for coarse separation. Spiral chute beneficiation is widely used for processing tungsten, tin, gold, platinum, iron and some rare metal ores, and it has wider application in processing low-graded sand ores.

The basic principle of spiral chute beneficiation goes like this: The thickness of the water course in the chute can be different. As for the chute processing coarse ores, the thickness of the water course can be from ten to hundred millimeters, the water flow is in the turbulent condition, and the ore feeding granularity can also be different. As for the chute equipment processing fine and superfine particles, the ore pulp flows through the surface of the equipment in very thin layer, and this ore beneficiation method is often called film concentration.

The loose distribution of the ore particles in the ore sand chute is because the water flow in the bevel is in the turbulent condition, and there is vertex which will produce instant fluctuating velocity, and the uplift force produced by the normal speed will cause the ore particles to distribute loosely in the water flow. The essence can be understood as the falling of the ore particles in the vertical upwelling. As the ore particles with different density and granularity will have different falling speed, the coarse particles with big density will fall to the bottom, the fine particles with small density will flow on the top, and the fine particles with big density and the coarse particles with small density will float in the middle of the water flow.