铝土矿选别尾矿制备新型土聚材料的研究

Study on Preparation of New Geopolymeric Cement with Tailings from Bauxite Beneficiation

以选别尾矿为原料制备新型土聚材料,考察了煅烧温度、活化时间、颗粒细度、碱激发剂品种、水玻璃模数和掺量对土聚材料强度的影响。研究表明,选别尾矿在800℃条件下活化4 h,比表面积为400±50m2/kg,用模数为1.2的水玻璃做激发剂,在掺量10%条件下可以制备出抗折、抗压强度分别达到6.15 MPa、30.31 MPa的新型胶凝材料;对土聚材料胶凝机理进行了简要分析。

Geopolymeric materials were prepared by using mineral processing tailings of bauxite as raw materials.The effects of calcination temperature,activation time,fineness of tailings,the species of alkali activators,modulus and dosage of sodium silicate solution on the strength of geopolymeric material were studied.The results show that the tailing of bauxite with 400±50 m2/kg specific area,which activated at 800 ℃ for 4 h by using 10% sodium silicate solution with modulus of 1.2 as activator,have formed perfect geopolymeric materia1s.The optimal bending strength and compression strength are up to 6.15 MPa and 30.31 MPa,respectively.Moreover,the mechanism of polymerization of geopolymeric is discussed.