以铅锌尾矿为原料煅烧水泥熟料

发布时间：2018-07-10 11:20

  本文选题：铅锌尾矿 + 煅烧　； 参考：《金属矿山》2017年03期

【摘要】：以广西河池富源铅锌选矿厂尾矿为主要原料煅烧制备水泥熟料,从不同煅烧温度下熟料成分的差异,水化产物的微观相貌和组成,煅烧过程中重金属的固化与熟料净浆试块的毒性浸出情况,以及熟料净浆试块的力学性能等方面探讨了用该铅锌尾矿制备水泥熟料的适宜工艺条件。试验结果表明:掺有35.4%广西河池富源铅锌尾矿的生料煅烧制备水泥熟料的最佳烧成温度为1 350℃,此时可生成大量有利于熟料强度的C2S和C3S。该水泥熟料的主要水化产物为C—S—H和钙矾石,试块前期强度的主要来源是钙矾石,后期强度的主要来源是C—S—H,C—S—H填满试块内部空隙,增大试块密实度,使试块28 d龄期的抗压强度达到43.68 MPa,与普通硅酸盐水泥P.O 42.5的28d抗压强度指标相当。煅烧过程中Pb的固化率较低,仅为21.16%,而As和Zn的固化率则高达87.61%和91.43%。养护龄期为3 d和28 d的水泥净浆试块浸出液中As、Pb、Zn的含量远低于浸出毒性标准。这种水泥熟料在生产地下胶结充填料的胶结剂方面具有一定潜力。
[Abstract]:Cement clinker was prepared from tailings of Fuyuan Lead-Zinc Concentrator in Hechi, Guangxi. According to the difference of clinker composition at different calcination temperatures, the microcosmic appearance and composition of hydration products were obtained. The solidification of heavy metals during the calcination process and the toxic leaching of the clinker paste test block, as well as the mechanical properties of the clinker net slurry test block, were discussed in this paper. The suitable technological conditions for the preparation of cement clinker from the lead-zinc tailings were discussed. The experimental results show that the optimum sintering temperature of raw material calcined with 35.4% Fuyuan lead-zinc tailings is 1 350 鈩，

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