According to the definition in the book, sieving is a grading process in which a bulk mixture having a different particle size is passed through a single-layer or multi-layer sieve mesh, and the particle size is divided into two or more different granule products. The passage of material through the screen surface is referred to as sieving. A machine equipped with a screen surface for material screening is called a screening machine.

Screening machinery is widely used in metallurgy, mining, coal, chemical, petroleum, electric power, transportation, construction, food, medicine and environmental protection departments. It can classify, dehydrate, de-sludge and de-intermediate a variety of loose materials.

1. Metallurgical industry:
In the metallurgical industry, when blast furnace smelting, the entry of too much powdery material will affect the gas permeability during the blast furnace smelting process and cause serious accidents. For this reason, the raw materials and fuel fed to the blast furnace must be sieved beforehand to powder. The fines are separated from the mixture.

2. Mining industry:
In the crushing and screening process of metal and non-metal mines, round vibrating screens are commonly used to pre-screen, check and pre-screen the ore. The fixed fine sieve and the vibrating fine sieve are used instead of the double spiral classifier to classify the grinding products according to the particle size to improve the concentrate grade. The high-frequency vibrating fine screen is used to classify the tailings of the beneficiation plant to improve the recovery rate of the concentrate. The vibrating screen of various specifications has become an indispensable key equipment for the ore dressing plant.

3. Coal industry:
In the coal preparation plant, different vibrating screen coals are used for sieving and grading in different occasions to obtain coals with different uses and different particle sizes: the linear and vibrating screens are used for dehydration and de-consolidation of the clean coal and the final coal; The vibrating centrifugal dewatering screen is used to dewater the slime and fine coal; the string sifting, the relaxation screen, the roller screen and the rotating probability sieve can solve the hole blocking problem of fine coal with water content of 7% to 14%. And can improve the screening efficiency.

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