细粒级尾矿膏体最佳排放浓度确定方法

Determination Method of the Best Discharge Concentration for Fine Tailing Paste

目前,尾矿浆体达到膏体状态的质量浓度的确定主要通过塌落度及经验法,对于集料粒度在毫米级的矿山尾矿并不完全适用。对于细粒级全尾矿,应以物料的基本特性为基础,探寻相适应的细粒级尾矿达到膏体状态的质量浓度。以某矿山细粒级铜尾矿的膏体排放为研究背景,基于饱和度及泌水率2个指标,确定细粒级尾矿达到膏体状态的质量浓度方法,并通过试验确定了达到膏体状态的质量浓度范围为73%~75%;同时根据流变试验,确定不同浓度条件下料浆的流变参数;结合管道输送特性,分析了浓度对管道输送阻力的影响;开展了料浆滩角试验,考察其在排放场地的流动性能;最终综合分析评价其输送性能及流动性能,确定全尾砂膏体排放最佳质量浓度为74%。

At present,the slump loss and empirical method are the main determination methods of the mass concentration of tailings paste,which is not suitable for millimeter-sized tailings. The situate mass concentration of fine grained tailings paste can be obtained effectively based on basic characteristics of materials. Taking the paste discharge of the fine copper tailings of a mine as the study background,the determination method of mass concentration of fine grained tailings is proposed based on the indicators of saturation ratio and exudation rate,the mass concentration is from 73% to 75% of fine grained tailings paste is determined by test. The rheological parameters of slurry under different conditions of concentration are obtained by conducting rheological test,the effects of tailings concentration of pipeline transfer resistance is analyzed based on pipeline transfer charac-teristics. Besides that,the slurry beach angle test is done to analyze the flowing property of tailings slurry in emission zones. Ul-timately,the transfer property and flowing property of the tailings slurry are evaluated comprehensively and the best mass con-centration of unclassified copper tailings paste is identified as 74%.