用石煤提钒尾矿制备免烧砖

为寻求综合利用陕西五洲矿业公司石煤提钒尾矿的有效途径，在分析该尾矿理化性质的基础上，进行了利用该尾矿制备免烧砖的试验研究。结果表明，将该尾矿的一部分加工成-0.088 mm的尾矿细粉后，采用原尾矿、尾矿细粉、水泥在固体干料中的质量分数分别为65%、27%、8%，水与固体干料的质量比为8%的配方，在成型压力为15 MPa的条件下，制备出的免烧砖28 d抗压强度为30.43 MPa、体积密度为2.15 g/cm3、气孔率为11%、吸水率为5%，强度等级达到《JC/T 422-2007〓非烧结垃圾尾矿砖》中MU25级制品的要求。

Preparation of Unfired Bricks with Vanadium Extracted Tailings from Stone Coal

To seek for an effective proposal on utilization of vanadium extracted tailings from Shaanxi Wuzhou Mining Company，and based on the analysis of physical and chemical properties of the tailings，experimental research on preparation of unfired bricks with the tailings was made. The results showed that parts of the tailings were processed into tailings powder with particle size of -0.088 mm. After that，with the mass fraction of original tailings，tailings powder，cement of 65%，27%，8% as dry solid compound respectively，the mass ratio of water and dry solids of 8%，and under the molding pressure of 15 MPa，the unfired bricks with compressive strength of 30.43 MPa，bulk density of 2.15 g/cm3，porosity of 11% and water absorption of 5% at 28 d were prepared. Its strength meets the requirement of MU25 products on the standard for “JC/T 422-2007 Waste Tailings Non-sintered Bricks”.