The beneficiation production line is composed of jaw hammer crusher, ball mill, classifier, magnetic separator, flotation machine, thickener and dryer and other main equipment. Together with the feeder, elevator and conveyor, it can form a complete beneficiation production line . The production line has the advantages of high efficiency, low energy, high throughput and reasonable economy. Usually the mined ore is firstly crushed by the jaw crusher. After being crushed to a reasonable fineness, the ore is fed into the ball mill through the elevator, and the ore is crushed and ground by the ball mill. The ore fines ground by the ball mill enter the next process: classification. The spiral classifier classifies the ore mixture by the principle that the specific gravity of the solid particles is different and the precipitation speed in the liquid is different.
The crushing, grinding and grading in the beneficiation process with the beneficiation equipment refers to the operation of reducing the particle size of the mineral raw materials with certain mechanical equipment and having certain particle size distribution characteristics. Generally, the operation of reducing the particle size to 20-5mm is called crushing, and the corresponding equipment is a crusher; the finest crushing operation is called grinding, and the corresponding equipment is a grinding machine; the final control of the crusher and the grinding machine The operation of product particle size distribution is called grading, and the grading equipment supporting the crusher is generally called the sieving machine, and the grading equipment of the mineral processing equipment matching the mill is called the grading machine.
Usually, the two types of processing equipment, crushing and grinding, are carried out in stages, because in most cases, the existing processing equipment cannot crush large pieces of raw ore to the required fineness at once. The specific selection of the number of crushing and grinding sections depends on the nature of the original ore, material size, product fineness and equipment type. Each time the material passes through a crusher or grinding machine, it is called a crushing or grinding section. For each section of crushing or grinding operation, the ratio of the particle size before and after crushing of the material (that is, the feed particle size and product particle size) is defined as the crushing ratio or crushing ratio of the section of crushing or grinding operation. The degree to which the particle size of the material (mine) decreases after being crushed by the machine. The total crushing ratio or crushing ratio of each crushing or crushing process.
The difficulty of crushing materials is called crushability. The crushability of the material is related to its own strength, hardness, density, structural uniformity, viscosity, cracks, water content and surface shape. Both strength and hardness indicate the resistance of the material to external forces, so materials with greater strength and hardness are more difficult to crush.