In the production process of some industries, it is necessary to crush or grind the material, and the specifications of different crushing or grinding specifications of different customer groups in the industry are also different. In many industries, the initial screening after crushing or grinding has a good improvement on the screening efficiency of finished products in the later stage. Let's talk about the application.
The output is not the same in different industries, no matter the material from the various crushers or mills goes through a preliminary screening, also known as a coarse screening, according to the name, it must also be possible to roughly know that the screening work at this time is a large number of preliminary non-refined screening, which has several characteristics:
The processing capacity is large, and the mesh selection is larger. For example, in the material with a larger particle size, the material below 10 is subdivided or even smaller specifications, and more than 10 belongs to the non-finished material, most of which will be returned to the crushing equipment, and there is a vibrating screen or trommel screen with a large processing capacity to complete this work will be less than the mesh hole into the next part. Some grinding materials are finer, for example, most of the finished powder is less than 60 mesh, at this time, a mesh of about 10-30 mesh will be configured to carry out a large filtration.
2. The screening accuracy is not high. Because of the large processing capacity, the screening accuracy will be slightly lower than the later finished product screening, here it should be noted that if the sieve is selected very small, it may lead to a slightly higher content of the sieve material in the sieve, the selection is appropriate, the output can be reduced or the mesh can be appropriately enlarged.
3. Single-layer screening. Single-layer screening is mostly used for preliminary filtration.
There may be a question, isn't it possible to save a machine by directly sieving a machine with a large and small one to screen out the finished product? There are also many factories that are arranged in this way, which is also a reasonable arrangement, and most of the materials under working conditions are 1-3 layers of screening, and the mesh is relatively large. Isn't it okay to have fine powder materials? The answer is also yes, which needs to be considered in combination with the actual screening needs, material conditions and other factors. Therefore, the screening operation is also a very professional thing, with a certain technical content.