The crushing equipment selected must be able to feed the largest block in the feed. Therefore, the width of the crusher feed port should be 1.2 times the maximum block size. When designing large and medium-sized concentrating plants, before selecting the jaw crusher or selecting the gyratory crusher, the equipment installation power, equipment weight, capital investment, production management fee, equipment configuration and process operation advantages and disadvantages are generally obtained. In terms of technical and economic comparison, the selection is preferred. When designing medium and small concentrators, in order to adapt to the characteristics of the mining site to a large degree of ore, it is necessary to use a coarse crusher that is compatible with the size of the nugget. When selecting a coarse crusher located in a mine pit, a special underground crusher that can be disassembled by the crusher should be considered. The crusher located in the open pit can be a semi-mobile or mobile crusher. The advantages of the jaw crusher are: simple structure, light weight, low price, easy maintenance and transportation, small height and low required plant height. In terms of process, it is reliable in operation, convenient to adjust the discharge port, and crushed wet ore. And it is not easy to block when it contains ore with more clay . The disadvantage is that the lining plate is easy to wear, the processing amount is lower than that of the gyratory crusher, and the particle size of the crushed product is not uniform. When the mass is too large, the ore is required to be evenly distributed, and the ore supply equipment needs to be set. In recent years, many domestic manufacturers have developed a series of new large crushing ratio jaw crushers, which have greatly improved the performance. In particular, the medium and small jaw crushers are more prominent, and should be given full attention when selecting the type. The gyratory crusher is a kind of equipment with high crushing capacity, which is mainly used for crushing hard ore in large and medium-sized concentrating plants. Compared with the jaw crusher, the advantages are: low power consumption; continuous crushing of ore, large processing capacity, under the same conditions of the mine mouth and discharge port, the processing capacity of the gyratory crusher is 2.5 to 3 of the jaw crusher. Double; the wear of the liner in the crushing chamber is evenly distributed; the crushed product has too much bulk and uniform particle size; when the ore supply condition is more suitable, it can be “squeezed to the mine†without the need for feeding equipment. The disadvantages are: the structure of the equipment is complex; the fuselage is high and the weight is large, and a solid foundation is required to increase the height of the plant. Therefore, it is usually used in large-scale concentrators and large cement plants.
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Coarse crusher selection principle
Metal mine beneficiation plant coarse crusher, jaw crusher generally used or a gyratory crusher, in certain non-metallic minerals and cement industries, when processing hard or soft ores, may be employed or a hammer crusher Impact Crusher.