利用石墨尾矿制备烧结砖中泛霜性能的调控技术研究

Study on Efflorescence Suppression of Sintered Bricks from Graphite Tailings

以石墨尾矿为主要原料,辅以适量黏土和煤泥制备烧结砖,对烧结砖泛霜现象进行调控研究。扫描电子显微镜(SEM)及X射线能谱仪(EDS)分析结果表明,石墨尾矿中的方解石、黄铁矿以及煤泥中的有机硫,相互反应生成了导致烧结砖泛霜物质CaSO4。通过控制烧结砖原料粒度及添加一定量BaCO3、无定型二氧化硅可有效解决烧结砖的泛霜问题。当原料粒度达21.48μm,并添加2%BaCO3和7%无定型二氧化硅时,可以完全抑制烧结砖的泛霜现象。该烧结砖制品满足GB 5101-2003《烧结普通砖》中烧结装饰砖的性能要求。

The main objective of this paper was to investigate and control the efflorescence phenomenon of sintered bricks prepared mainly by graphite tailings, adequate clay and coal slurry. The scanning electron microscopy （SEM） and energy dispersive spectrometer （EDS） analysis indicated that CaSO4 formed by reacting among calcite, pyrite in graphite tailings and organic sulfur in coal slurry, resulted in efflorescence of sintered bricks. The problem of efflorescence can be solved by adding adequate amorphous SIO2, BaCO3 and controlling the particle size of raw materials. The efflorescence can be prevented by adding 7% amorphous SIO2, 2% BaCO3 and reducing the fineness of raw materials to the 21.48 um. And the products meet the property requirement of tired facing bricks in 《sintered common brick》 （GB 5101-2003）.