摘要
针对煤泥浮选过程中蒙脱石等黏土矿物难以与煤分离的难题,以硅酸钠作抑制剂、煤油作捕收剂,采用强机械搅拌强化矿浆分散与浮选药剂选择性调控同步抑制相结合的方式,对东庞矿选煤厂原生入浮煤泥进行了浮选试验,并通过药剂吸附量测定和接触角测量等方法对选择性调控原理进行了定量表征。结果表明:采用先加捕收剂、再加抑制剂的药剂调控方式,可增强硅酸钠在煤和蒙脱石表面吸附的选择性,强化煤和蒙脱石颗粒表面润湿性的差异,促进煤与蒙脱石的浮选分离;采用强化分散-同步抑制方式进行煤泥浮选时,精煤产率和灰分分别为47.03%和14.21%,浮选完善度可达30.83%;在精煤产率相当的情况下,精煤灰分显著降低。
In order to overcome the difficulty in separation of clay minerals such as montmorillonite in fine coal flottation process, test on flotation of the primary slime of Dongpang Mine Coal Preparation Plant is conducted using sodium silicate as depressant and Kerosene as collector and by means of intensified pulp dispersion through strong mechanical agitation in combination with selective control of flotation reagent. Meanwhile, the principle of se3 lective control is characterized quantitatively by measuring adsorptive capacity of reagent and contact angle. Test result shows that: the selectivity of sodium silicate adsorbing onto coal and montmorillonite surface can be enhancedby adding first collector and then depressant;a wide difference between coal and montmorillonite particle surfae in wettability can help promote the separation of coal and montmorillonite;when the enhanced pulp dispersion and selective control method is used in slime flotation, the concentrate yield and ash are respectively 47.03% and 14.21% with a perfect index reaching 30.83%;and even with a yield of concentrate equal to that before renovation is made, the concentrate ash can be noticeably reduced.
作者
李大虎
王建忠
荣令坤
白春华
LI Dahu;WANG Jianzhong;RONG Lingkun;BAI Chunhua(School of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou 014010,China)
出处
《选煤技术》
CAS
2019年第6期10-15,共6页
Coal Preparation Technology
基金
国家自然科学基金青年科学基金项目(51604281)
内蒙古科技大学创新基金项目(2017QDL-B13)。
关键词
煤泥
蒙脱石
浮选
硅酸钠
coal slime
montmorillonite
flotation
sodium silicate
