江西某红土镍矿冶炼炉渣作水泥混合材

The Laterite Nickel Ore Smelting Slag Used as Cement Admixture

研究了江西某红土镍矿冶炼炉渣作为水泥混合材使用的可行性。研究结果表明:炉渣放射性和浸出毒性远小于国家标准限值,不具有危险性,属于一般工业固体废物,作为建筑材料原料不会影响产品使用;炉渣火山灰活性合格,具有潜在的水硬性,是一种活性混合材;经稳定化处理后,掺加炉渣的水泥压蒸安定性合格,随着炉渣掺量的增加,水泥胶砂强度逐渐降低;对不掺炉渣和掺入30%炉渣的净浆28 d试块的XRD图谱和SEM图谱进行了分析,指出了对净浆试块性能产生影响的原因。

The possibility of applying the laterite nickel ore smelting slag as the admixture of cement is analyzed. The result shows that the slag radioactivity and leaching toxicity are far lower than the limit value of national standard, without any hazards. The slag belongs to the common industrial waste solid and can be used as the raw building materials that not affect the product quality. It has potential hydraulic property with qualified pozzolanic property, and it can be used as active admixture. After stabilizing treatment, the cement mixed with the slag has a qualified autoclave expansion. The cement-mor- tar strength gradually decreased with the increasing of the slag content. SEM images and XRD patterns of the specimens of cement pastes without the slag and mixing with 30% slag at 28 d are analyzed, and the reason for affecting the property of the specimens of cement pastes is pointed out.