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Application Of Laminating Crushing In Closed Crushing Process
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Attrition is a term applied to the reduction of materials by scrubbing it between two hard surfaces. Hammer mills operate with close clearances between the hammers and the screen bars, and they reduce by attrition combined with shear and impact reduction. Though attrition consumes more power and increases wear on hammers and screen bars, it is practical for crushing less abrasive materials such as pure limestone and coal.
According to material feeding-in pattern, crushing equipment can be divided into single-particle crushing machine and laminating crushing machine. The laminating crushing can be further divided into material layer crushing, particle group crushing and intergranular crushing. Single-particle crushing is the basis of crusher working principle. Scholars from home and abroad have carried out extensive research work on it. Laminating crushing happens among bulk materials by collision, impacting and grinding effect. Due to the interaction of material, the layers are formed. We can refer to the theoretical achievements to make a breakthrough in national crushing equipment. The research on and improvement of crushing equipment, such as impact crusher, jaw crusher, tertiary impact crusher, become more and more comprehensive with the advancement of national economy.
Closed-circuit crushing is a means of controlling product top size by screening the product and then returning oversize material to the feed end of the crusher for another pass through the machine. While it may be possible to obtain a specified top size from crushers without using a closed-circuit system, it is not always desirable. To control top size from a single crusher operating in an open circuit, material must remain in the crushing chamber until it is reduced. This can result in overcrushing a percentage of the product, with a corresponding increase in fines and a loss of efficiency. In a typical multiple-stage crushing plant with the last stage operated in closed-circuit, the primary crusher operates at a setting which produces a satisfactory feed size for the secondary crusher, so that a balance exists for the work done by each crusher.
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