Research of anti-freezing adhesive spray technology ofcoal belt conveying system in freezing cold area

In order to solve the long term freezing and adhered material on the coal conveying system of the belt conveyor in winter outdoor of Xinjiang, Inner Mongolia and other freezing cold areas in China, the freezing and adhered material would cause the coal dust concentration increased and the great amount fallen coal accumulated along the sides of the belt conveyor, the serious coal dust pollution to the downstream residents and other problems. Based on the special features of the anti-freezing adhesive solutions, taking No. 4 production system of a coal preparation plant as a study object, the anti-freezing adhesive spraying technology was applied to reconstruct the available coal conveying system and a trial application was conducted at the site. The test results showed that the spraying technology thoroughly solved the long term freezing and adhesive material problem of the belt coal conveying system under the freezing cold condition with a temperature ranging from -5 ～ -40 ℃. Thus the falling coal quantity along the belt conveyor was reduced over 85%. Meanwhile the slip, off central running, coal dispersion and other phenomenon of the conveying belt were highly reduced, the production efficiency was improved and the labor intensity of the operation personnel was reduced. The operation environment (the respirable dust and total dust mass concentration higher than 3.5 and 5 mg/m3) was reached to good expected effect.