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模拟水泥窑高温煅烧掺有Cd、Ni化学试剂的水泥生料,由制取的水泥熟料制备水泥净浆片.通过电子探针的点、线、面分析,研究了水泥净浆中Cd、Ni的整体分布和在不同矿物相中的具体分布特征.结果表明,Cd、Ni在水泥净浆中均出现了富集现象:元素分布图像显示Cd主要赋存于水化氢氧化钙(CH)晶体中,主要以Cd/Ca氢氧化物形式存在于水泥净浆中,线分析结果指出水化氢氧化钙(CH)晶体中Cd含量自晶体内部向外递减;面或点分析表明其它矿物相中Cd含量较低,其中点分析结果显示中间相中Cd浓度均低于1%.Ni富集区域面积都较小,元素分布图像和线分析结果都表明Ni与Mg的分布有着较好的一致性,主要形成Ni-Mg化合物,以独立矿物相形式随机分布于水泥净浆中;面或点分析表明其它水化产物中Ni含量较低,其中点分析结果显示中间相中Ni浓度均在1%左右.
The cement raw materials mixed with Cd and Ni chemical agents were calcined at high temperature in cement kiln and the cement plaster was prepared from the clinker.According to the point, line and surface analysis of electron probe, the effects of Cd, Ni and its distribution in different mineral phases.The results show that Cd and Ni all appear to enrich in the cement paste.The elemental distribution images show that Cd mainly exists in the hydrated calcium hydroxide (CH) Crystal, mainly in the form of Cd / Ca hydroxide in the cement paste, line analysis results indicate that the hydration of calcium hydroxide (CH) crystals in the crystal content from the inside of the outward decline; surface or point analysis shows that other mineral phase The results of mid-point analysis showed that the concentrations of Cd in the mesophase were all less than 1%, and the area of Ni-enriched area was small. Both the elemental distribution images and the line analysis results showed that the distribution of Ni and Mg was in good agreement The Ni-Mg compounds were mainly formed in the form of independent mineral phases and were randomly distributed in the cement paste. The surface or point analysis showed that the content of Ni in other hydration products was low. The mid-point analysis showed that the concentrations of Ni in the mesophase were all 1 %about.