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Stabilization of Cu (Ⅱ) wastes by C_3S hydrated matrix

机译：C_3S水合基质稳定Cu（Ⅱ）废物

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摘要

Cement is the most adaptable binder currently available for the immobilization of heavy metals. C_3S, tri-calcium silicate, is one of the main phases in OPC and many of its properties were related to C_3S. In the present work the stabilization of Cu (Ⅱ) wastes by C_3S during its early hydration (from 3 h - 7 days) was studied. Copper ions here either doped inside C3S during its preparation or present in the water of hydration. Levels of Cu (Ⅱ) used were 1 and 3 wt.% of C_3S. The chemically combined water and free Ca(OH)_2 contents were determined after 3, 6 h and 1, 3 and 7 days of hydration. X-ray diffraction examination was performed for some selected samples. The results showed that the presence of Cu (Ⅱ) ions retard the early hydration of C_3S. This is due to the precipitation of the less soluble Cu(0H)2 which retards the precipitation of Ca(OH)_2 as a result of the reduction in pH. Immobilization percentage of Cu (Ⅱ) ions inside the C_3S hydrated matrix was examined by the determination of the leached copper by using atomic absorption spectroscopy. Most of the investigated samples showed high degree of immobilization of Cu (Ⅱ) ions and the doped mixes showed better immobilization results than mixes hydrated in water containing wastes. The rate of leached Cu (Ⅱ) ions from the matrix of hydrated C_3S was investigated by the application of diffusion equation derived for a plane source model.
机译：水泥是目前可用于重金属固定的最适应性粘合剂。 C_3S硅酸三钙是OPC中的主要相之一，其许多性质与C_3S有关。在目前的工作中，研究了C_3S在其早期水化过程中（从3 h-7天）稳定铜（Ⅱ）废物的过程。这里的铜离子要么在C3S的制备过程中掺杂在C3S内部，要么存在于水合水中。 Cu（Ⅱ）的用量为C_3S的1和3 wt。％。在水合3、6 h和1、3和7天后，确定化学结合的水和游离Ca（OH）_2的含量。对一些选定的样品进行了X射线衍射检查。结果表明，Cu（Ⅱ）离子的存在阻碍了C_3S的早期水合。这是由于难溶性Cu（0H）2的沉淀，由于pH降低，该沉淀阻碍了Ca（OH）_2的沉淀。通过原子吸收光谱法测定浸出的铜，测定了C_3S水合基质中Cu（Ⅱ）离子的固定百分比。大多数研究样品显示出较高的Cu（Ⅱ）离子固定化程度，掺杂的混合物显示出比含水废物中水合的混合物更好的固定化结果。利用平面源模型推导的扩散方程，研究了水合C_3S基体中Cu（Ⅱ）离子的浸出速率。

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