Tackling in a comprehensive way the problems caused by the presence of secondary froth in the flotation system of Jiangzhuang Mine coal Preparation Plant

In order to solve the problem of operational disorder of the flotation system caused by presence of secondary froth after the system went into operation, a comprehensive control approach focusing on optimization of flotation process and technical transformation of fixed equipment with stress on the former has been adopted, through taking a series of technical measures and empirical study. The comprehensive approach includes optimization of the existing flotation circuit with the use of flotation column which has a better performance in separation of fine coal for preventing ultrafine particles to stick onto froth making the latter difficlut to break up; use of pneumatic striking device on fine coal sieve bend for effectively improving the sieving performance; and replacement of the straight pipe with a twisted chute and addition of water spraying devices above the chute, slurry water tank, pond and thickener to improve the froth breaking effect of slurry water delivery and final treatment links-a renovation made based on the study of the influencing factors involved in the slurry water delivery link. Adoption of the comprehensive approach has met with a good result as evidenced by reduced accumulation of froth in flotation system and various process links and effectively improved operating stability of flotation circuit. The comprehensive control means is worthy of popularization for facilitating and improving coal cleaning system management work.