基于尾矿沉降试验的深锥浓密机尺寸确定方法

Method for determining deep cone thickener size based on batch settling test

为确定合理的矿山充填深锥浓密机尺寸,通过开展分批沉降试验,研究尾矿浆初始浓度对深锥浓密机尺寸的影响,并对Talmage-Fitch法(T-F法)、Oltmann法和Wilhelm-Naide法进行详细对比分析。结果表明:尾矿沉降速率随尾矿浆初始浓度的增加而减小,底流浓度随尾矿浆初始浓度的增加呈先增大后趋于不变,合适的尾矿浆初始浓度可减少深锥浓密机的断面面积。三种方法计算得到的单位面积(UA)的关系为T-F法>Oltmann法>Wilhelm-Naide法,深锥浓密机断面面积计算推荐采用Oltmann法。当尾矿浆初始浓度为20%,絮凝剂添加量为20 g/t,尾矿处理量为6000 t/d时,T-F法、Oltmann法和Wilhelm-Naide法计算得到的深锥浓密机直径分别为28、25和11 m。

In order to determine the reasonable size of deep cone thickener for mining backfill,initial concentration of the tailings slurry affecting the size of deep cone thickener was studied,and comparison and analysis of Talmage-Fitch method(T-F method),Oltmann method,and Wilhelm-Naide method used to design the thickener were carried out by conducting batch settlement test.The results showed that the settling velocity of tailings decreased and the underflow concentration increased first and then tended to remain unchanged with the increase of initial concentration of tailings slurry.The proper initial concentration of tailings slurry can reduce the cross-sectional area of deep cone thickener.The relationship between three thickener design methods for calculating per unit area(UA)value was T-F method>Oltmann method>Wilhelm-Naide method.Oltmann method was recommended for calculating the deep cone thickener cross-sectional area.When the initial concentration of tailings slurry was 20%,the amount of flocculant was 20 g/t,and the amount of tailings processed was 6000 t/d,deep cone thickener diameters calculated by T-F method,Oltmann method,and Wilhelm-Naide method were 28 m,25 m,and 11 m,respectively.