Tackling in a comprehensive way the problems caused by the presence of secondary froth in the flotation system of Jiangzhuang Mine coal Preparation Plant
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摘要: 蒋庄煤矿选煤厂在浮选系统运行之后，为了彻底解决浮选系统次生泡沫造成的系统紊乱等问题，通过一系列的技术举措和经验摸索，逐步形成了以工艺优化为主，固定设施改造为辅的技术手段进行综合治理。对于细粒煤泥分选效果更佳的浮选柱作为系统优化的研究，以减少超细颗粒粘附在泡沫而导致泡沫难以破碎的现状；对于能够有效提高煤泥弧形筛透筛性设备进行探索应用，增加筛面气动击打装置；对于煤泥水输送环节影响因素进行研究，将直管道改造为转折溜槽配以喷淋，在料筒(池)和浓缩池增设喷淋，以提高输送环节和终端环节的消泡效果。结果表明，通过综合治理技术举措，浮选系统各环节泡沫积聚逐步减少，有效促进了工艺及系统运行稳定，取得了良好的应用效果，在洗选工艺系统管理工作具有积极的推广利用价值。Abstract: 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.
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