细粒黄金尾矿制备烧结砖的试验研究

为了解决细粒黄金尾矿的堆存对环境的污染和资源浪费问题,以细粒黄金尾矿为主要原料,添加膨润土、粉煤灰制备烧结砖。对原料基本成分分析后,采用模压成型法来制备烧结砖,主要研究焙烧温度、保温时间、以及物料的不同配比对烧结砖性能的影响。结果表明:最佳组成为尾矿75%(质量分数,下同),膨润土15%,粉煤灰为10%;最佳工艺条件为成型水分10%,成型压力20 MPa,焙烧温度1 175 ℃,保温时间50 min。在该条件下制备的烧结砖的抗压强度为38.71 MPa,抗折强度为10.54 MPa,体积密度为1.908 g/cm³,吸水率为3.5%。

Experimental Study on Preparation of Sintered Brick from Fine Gold Tailings

In order to solve the problem of environmental pollution and resource waste caused by the stockpiling of fine gold tailings, sintered bricks were prepared with fine gold tailings as the main raw material by adding bentonite and fly ash. The effects of sintering temperature, holding time and different proportion of materials on the properties of sintered bricks were studied. The results show that the optimal composition is 75% (mass fraction, same as bellow) of tailings, 15% of bentonite and 10% of fly ash. The optimum process conditions are 10% water content, 20 MPa forming pressure, 1 175 ℃ sintering temperature and 50 min holding time. The sintered bricks with compressive strength of 38.71 MPa, flexural strength of 10.54 MPa, volume density of 1.908 g/cm³, water absorption of 3.5% can be prepared by this process.