金矿全尾砂浆动静态絮凝沉降规律研究

Study on Flocculation and Sedimentation Characteristics of Unclassified Tailings in Gold Mine

为获得山东某金矿全尾砂浆静态浓密沉降特性规律,首先采用室内试验对该矿全尾砂进行物理化学特性分析,在此基础上,以控制变量法开展絮凝剂选型试验,然后,以全尾砂浆质量浓度和絮凝剂单耗作为输入因子,固体通量值为响应,采用响应面中心复合设计法(RSMCCD),针对该矿全尾砂浆进行9组全尾砂浆静态浓密试验,根据试验结果建立响应曲面,对响应曲面参数进行可靠性分析。在静态浓密沉降试验基础上,对全尾砂浆进行浓密机动态絮凝沉降模拟试验。结果表明:以固体通量作为评价指标,全尾砂浆絮凝沉降过程,全尾砂浆质量浓度与絮凝剂单耗之间基本不存在交互作用,全尾砂浆质量浓度对固体通量值影响显著性水平高于絮凝剂单耗;当全尾砂浆质量浓度为14.7%和絮凝剂单耗为10.8 g/t时,响应曲面预测固体通量达到最大值为4.18(t/(h·m^(2))),与试验所测实际值误差小于3.5%;浓密机给料速度与底流浓度和屈服应力成负相关关系,与溢流水含固量成正相关关系。试验结果及动态沉降机理分析可为同类型矿山全尾砂浓密系统设计提供试验依据及理论指导。

In order to obtain the static thickening and sedimentation characteristics of the unclassified tailings of a gold mine in Shandong,firstly,the physical and chemical properties of the unclassified tailings of the mine were analyzed by laboratory test.On this basis,the flocculant selection test was carried out by the control variable method.Secondly,the mass concentration of the unclassified tailings and the unit consumption of flocculant were taken as input factors and the solid flux value was taken as response,Using Response surface central composite design method(RSM-CCD)in design experts,9 groups of static thickening tests of full tailings were designed and carried out for the full tailings of the mine.According to the test results,the response surface was established,and the reliability of the response surface parameters was analyzed.At the same time,based on the static dense settlement test,the dense dynamic flocculation settlement simulation test of all tailings was carried out.The results show that there is basically no interaction between the input factor total tailings mass concentration and flocculant unit consumption in the flocculation and sedimentation process of the whole tailings of the mine based on the solid flux,and the effect of total tailings mass concentration on the solid flux is significantly higher than that of flocculant unit consumption;When the mass concentration of total tailings is 14.7%and the unit consumption of flocculant is 10.8g/t,the predicted solid flux of response surface reaches the maximum value of 4.18(t/(h·m^(2))),and the error between the predicted solid flux and the actual value measured in the test is less than 3.5%;The feeding speed of thickener has a negative correlation with underflow concentration and yield stress,and a positive correlation with solid content in overflow water.The test results and dynamic settlement mechanism analysis can provide experimental basis and theoretical guidance for the design of full tailings thickening system in the same type of mines.