某电解锰渣免烧砖抗压和抗折强度研究

用某些固体废弃物制备免烧砖是实现固体废弃物大宗利用的重要途径，为确定贵州某电解锰厂电解锰渣制备免烧砖的可能性，在进行了浸出毒性分析的基础上，研究了渣泥质量比、骨料掺量、水固质量比及成型压力对免烧砖抗压强度和抗折强度的影响。结果表明：随着渣泥质量比的增大，试块的抗压、抗折强度均先上升后下降，高点在渣泥质量比为5时；随着骨料掺量的增大，试块的抗压、抗折强度均先增大后减小，高点在骨料添加量为30%时；随着水固质量比的增大，试块的抗压、抗折强度先增大后减小，高点在水固质量比为0.30时；成型压力从1.0 MPa提高至2.0 MPa，试块7 d和28 d的抗压、抗折强度都显著上升，继续提高成型压力，试块7 d和28 d的抗压、抗折强度上升幅度趋缓。当渣泥质量比为5，骨料添加量为30%，水固质量比为0.3，成型压力为2 MPa时，电解锰渣免烧砖7 d的抗压、抗折强度分别达到10.63 MPa和2.21 MPa，28 d的抗压、抗折强度分别达到 14.89MPa和2.48 MPa，达到国家普通砖的强度标准。

Analysis on Compressive and Flexural Strength of Unburned Brick with Electrolytic Manganese Slag

The preparation of unburned brick with solid waste is an important way to realize mass utilization of the solid waste.In order to determine the possibility of electrolytic manganese slag from a electrolytic manganese plant in Guizhou to prepare the unburned brick,and based on the leaching toxicity analysis,the effect of sludge-cement mass ratio,aggregate dosage,liquid-solid ratio,molding pressure on the flexural and compressive strength of brick were studied.The results showed that with the increase of sludge mass ratio,the compressive and flexural strength of the test block were firstly increased and then decreased,and reached the highest when the sludge-cement mass ratio was 5;With the increase of aggregate dosage,the compressive and flexural strength of the test block were increased firstly and then decreased with the highest value at the aggregate dosage of 30%;With liquid-solid mass ratio increasing,the compressive and flexural strength of the test block were increased firstly and then decreased with highest value at water-solid ratio of 0.30;The molding pressure was increased from 1 MPa to 2 MPa,and the compressive strength and flexural strength of the test block for 7 d and 28 d were increased significantly,and its rate of increase was slowed when the molding pressure was gradually improved.Under conditions of the sludge-cement mass ratio 5,the aggregate dosage of 30%,the liquid-solid ratio 0.3,the molding pressure at 2 MPa,the unburned brick with electrolytic manganese slag owns compressive strength and flexural strength 10.63 MPa and 2.21 MPa for 7d respectively,14.89 MPa and 2.48 MPa for 28 d respectively,which reach the national strength standard for common brick.