According to the different purposes of screening, screening operations can be divided into five categories:
(1) separate screening. The purpose is to get the final product suitable for users' requirements. For example, in the black metallurgical industry, the iron rich ore sieves with high iron content are often divided into different granularity qualified large iron ores to enter the blast furnace, and the powder ore enters the furnace by the pellets or the sintered blocks. This type of screening equipment is a large hot ore vibrating screen.(2) auxiliary screening, which is mainly used in crushing operations of mineral processing plants, plays a supplementary role in crushing operations. In general, there are pre screening and screening of screening. Pre screening refers to the sieving of the ore before it enters the crusher. It is separated from the ore by a vibrating screen, which is a qualified part for the crusher, such as the sieves, sieves, and sieves installed before the crusher. This will reduce the amount of ore entering the crusher and increase the output of the crusher. Screening is the screening of ore after crushing. The purpose of the screening is to ensure that the final crushing product meets the grain size requirements of the grinding operation, so that the unqualified ore products are returned to the crushing operation, such as the sieving of the medium and fine crusher, not only in pre screening, but also for screening and screening. Therefore, screening can improve the utilization of crushing equipment, similar to the closed cycle operation of classifier and grinding machine, so as to improve grinding efficiency.(3) preparation for screening is to prepare for the next assignment. For example, the gravity screening plant should use sieving equipment to sieving and grading materials before jigging.(4) if the distribution of the useful ingredients in the material varies greatly in the material, the screening classification can be used with vibrating screen to get the different grain grade, the quality of the grain is screened out, and the grade of the material is improved, and the screening is sometimes called.(5) dehydration sieving. The purpose of screening is to remove moisture from materials. Generally, dewatering sieves are more common in coal washery. In addition, when the material contains high cement, desliming is also carried out by sieving.
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