The feasibility of incorporating Cd and Ni in hematite was studied by investigating the interaction mechanism for the formation of Cd_xNi_1–xFe₂O₄ solid solutions (CNFs) from CdO, NiO, and α-Fe₂O₃. X-ray diffraction results showed that the CNFs crystallized into spinel structures with increasing lattice parameters as the Cd content in the precursors was increased. Cd²⁺ ions were found to occupy the tetrahedral sites, as evidenced by Rietveld refinement and extended X-ray absorption fine structure analyses. The incorporation of Cd and Ni into ferrite spinel solid solution strongly relied on the processing parameters. The incorporation of Cd and Ni into the CNFs was greater at high x values (0.7 < x ≤ 1.0) than at low x values (0.0 ≤ x ≤ 0.7). A feasible treatment technique based on the investigated mechanism of CNF formation was developed, involving thermal treatment of waste sludge containing Cd and Ni. Both of these metals in the waste sludge were successfully incorporated into a ferrite spinel solid solution, and the concentrations of leached Cd and Ni from this solid solution were substantially reduced, stabilizing at low levels. This research offers a highly promising approach for treating the Cd and Ni content frequently encountered in electronic waste and its treatment residues.

中文翻译：

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镉和镍掺入铁素体尖晶石固溶体中：X射线衍射和X射线吸收精细结构分析

结合镉和镍中的赤铁矿的可行性进行了研究通过调查镉的形成的相互作用机理_X的Ni _{1- X}的Fe _2个ö ₄从氧化镉，NiO和的α-Fe固溶体（的CNF）₂ ö ₃。X射线衍射结果表明，随着前驱体中Cd含量的增加，CNFs随晶格参数的增加而结晶为尖晶石结构。镉²⁺Rietveld精炼和扩展的X射线吸收精细结构分析证明，离子占据了四面体位置。在铁素体尖晶石固溶体中掺入Cd和Ni强烈依赖于加工参数。镉和镍到CNF的掺入了较大的在高X的值（0.7 < X ≤1.0）比在低X值（0.0≤ X≤0.7）。在研究CNF形成机理的基础上，开发了一种可行的处理技术，包括对含Cd和Ni的废渣进行热处理。废污泥中的这两种金属都成功地掺入了铁氧体尖晶石固溶体中，从该固溶体中浸出的Cd和Ni的浓度大大降低，并稳定在较低水平。这项研究为处理电子废物及其处理残留物中经常遇到的Cd和Ni含量提供了非常有前途的方法。