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In the main frame,a 1000-1500Kg high pressure spring is fixed to the roller suspender.After the grinder is put into effect,the roller will circumgyrate around the main shaft,and rolls closely against the grinding ring effected by the high pressure is 1.2 degree than Raymond mill.
After this grinding process, calcium carbide powder can achieve to 1 micron or less. The process for fine ground and ultrafine ground calcium carbide produced in a ultrafine dry grinding mill in closed circuit with a high efficiency air classifier. The particles are pulverized by a high speed agitated grinding media. The grinding media can be stainless steel, chrome steel, alumina or zirconia. When large calcium carbide stones are loaded to the working site, they will be conveyed into the crushing machines to turn into the calcium carbide particles, which then are fed pneumatically into the grinding mill.The manufacturing process of calcium carbide powder in Mongolia mainly consists of the crushing stage and grinding stage. The micronized particles are entrained in the air stream and exit the mill in a high efficiency air classifier. The on-size particles are separated and the oversize returned to the mill for regrinding.
Much of the gold dust found in mines has migrated into streams of placer gold, where it can be separated from the other streambed material and recovered.Placer gold is gold that has migrated from the lode through years of erosion, and most placer gold is found in creeks and streams.
The gypsum powders which don’t conform to the requirement will once again into the vertical mill for grinding. Then, the gypsums with the suitable size enter into the LM vertical mill for grinding. Through the screening action of vibrating screen, we can get the gypsum powder with required size.The big gypsum stone goes through the jaw crusher for the primary crushing, and the cone crusher for the second crushing. After crushed and grinded, the big gypsum stones turn into the fine gypsum power.
EEVA=∑i=1nNPEOATi−∑j=1nNNEOj. In this paper, when measuring the environmental impact and environmental sustainability of industrial systems, the total output Y is recalculated using the EEVA as shown in Equation (3).The traditional output emergy Y containing part of the invalid emergy (waste and emission) leads to the contradiction between emergy analysis and industrial sustainability analysis. The EEVA value is determined by dividing the environmental value created by the system into two parts: the value that is beneficial to the ecological environment, and the environmental load that is harmful to the ecological environment and requires environmental management.
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