安徽某铁矿山的絮凝沉降方案实验研究

安徽某铁矿山采用立式砂仓浓密沉降制备全尾砂原料膏体,制备过程出现了立式砂仓底流浓度低,溢流水跑浑等问题.为解决立式砂仓浓密存在的一系列问题,矿山拟采用深锥浓密机方案改造立式砂仓,需对全尾砂絮凝沉降方案开展实验研究.本次实验的絮凝沉降效果以上清液的澄清度、絮凝沉降底流浓度和沉降率三项指标综合考虑进行判断.实验第一步骤通过4种分子量的阴离子聚丙烯酰胺(APAM)沉降效果比较,优选出1 200万和1 600万的APAM最佳分子量方案;第二步骤实验确定最佳絮凝剂添加量,实验结果表明,分子量1 200万最佳添加量为10 g/t~20 g/t,分子量1 600万最佳添加量为20 g/t~30 g/t.本次絮凝沉降实验方法将全尾砂浆上清液的澄清度作为主要判断指标之一,满足了回水再利用的要求,对节约水资源和降低充填成本具有重要的意义.

Experimental Study on the Flocculant Selection Which is Based onthe Supernatant Clarity of the Full Tail Mortar

An iron mine of Anhui uses vertical sand bin dense settlement to prepare full tailing paste material,but in the process the problems of underflow concentration low and overflow mudflow have appeared.In order to solve the problems existed in the vertical sand bin,the mine plans to transform the vertical sand bin into the deep cone thickener.So we need to carry out the experimental study of the flocculation settlement of whole tailings.The effect of flocculation of this experiment use the three indicators as the comprehensive judgment:supernatant clarity,the underflow concentration of flocculating settling and sedimentation rate.The first step of the experiment is through comparison of the four kinds of molecular weight of anionic polyacrylamide (APAM) sedimentation effect,to select the best scheme of the APAM molecular weight of 12 000 000 and 16 000 000;The second step is to determine the best ratio of the flocculant experiment,the experimental results show that the optimal adding amount of the 12 000 000 molecular weight is 10 g/t~20 g/t,and the 16 000 000 molecular weight is 20 g/t~30 g/t.The selection of flocculant takes the full tail mortar supernatant clarity as one of the main judgment index,and has met the requirements of return water reuse.On the other hand it is of great significance to save water resource and reduce the cost of filling.