Roy Surendra, Adhikari Govind R, Gupta Rama N
National Institute of Rock Mechanics, Champion Reefs, Kolar Gold Fields, Karnataka, India.
Waste Manag Res. 2007 Oct;25(5):475-82. doi: 10.1177/0734242X07076944.
Mill tailings dumps at Kolar Gold Fields, Karnataka, are creating environmental problems. One of the solutions to these problems is to use the mill tailings for some useful purpose. This study examined the possibility of making bricks from the mill tailings with some additives in laboratory experiments. Samples of the mill tailings and the additives were analysed for particle size distribution, Atterberg limits and specific gravity. The plasticity index of the mill tailings being zero, they could not be used directly for making bricks. Therefore some additives that had plasticity or binding properties were mixed with the mill tailings. Ordinary Portland cement, black cotton soils and red soils were selected as additives. Each of the additives was mixed separately with the mill tailings in different proportions by weight and a large number of bricks were prepared using metallic moulds. The bricks were termed as cement-tailings bricks or soil-tailings bricks, depending on the additives used. The cement-tailings bricks were cured for different periods and their corresponding compressive strengths were determined. The bricks with 20% of cement and 14 days of curing were found to be suitable. The soil-tailings bricks were sun-dried and then fired in a furnace at different temperatures. The quality of bricks was assessed in terms of linear shrinkage, water absorption and compressive strength. The cost analysis revealed that cement-tailings bricks would be uneconomical whereas the soil-tailings bricks would be very economical.
位于卡纳塔克邦科拉尔金矿的选矿厂尾矿堆正在引发环境问题。解决这些问题的办法之一是将选矿厂尾矿用于某些有益的用途。本研究在实验室实验中考察了添加一些添加剂后用选矿厂尾矿制作砖块的可能性。对选矿厂尾矿和添加剂的样品进行了粒度分布、阿太堡界限和比重分析。选矿厂尾矿的塑性指数为零，无法直接用于制作砖块。因此，将一些具有塑性或粘结性能的添加剂与选矿厂尾矿混合。选择普通硅酸盐水泥、黑棉土和红土作为添加剂。每种添加剂分别与选矿厂尾矿按不同重量比例混合，并使用金属模具制备了大量砖块。根据所使用的添加剂，这些砖块被称为水泥尾矿砖或土壤尾矿砖。对水泥尾矿砖进行不同时间的养护，并测定其相应的抗压强度。发现含20%水泥且养护14天的砖块是合适的。土壤尾矿砖先进行日晒，然后在不同温度的炉中烧制。根据线性收缩、吸水率和抗压强度对砖块质量进行评估。成本分析表明，水泥尾矿砖不经济，而土壤尾矿砖则非常经济。
