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针对采用氢氟酸和草酸氧化浸出制备高纯石英的工艺,以元素Fe的去除为例,着重介绍了石英氧化浸出提纯过程中草酸络合离子的作用及其络合机理。草酸酸性强,络合常数大,在金属离子从石英表面氧化浸出过程中,C2O24-与Fe螯合,形成稳定的络合物,经洗涤分离脱除。研究建立了其各级络合物分布图,为精确控制化学反应提供了理论依据。另外还测定了不同处理方式对石英表面ζ电位的影响。研究结果表明:采用HF和草酸联合浸出工艺可将石英中杂质金属元素含量从40～50 ppm降至20～25 ppm,其中元素Fe从2 ppm降至0.186 ppm。
Aiming at the process of preparing high purity quartz by hydrofluoric acid and oxalic acid leaching, taking the removal of elemental iron as an example, the effect of complexing oxalic acid ions and its complexation mechanism in quartz oxidation leaching purification process are emphatically introduced. The oxalic acid is strong in acidity and has a large complexation constant. During the oxidation leaching of metal ions from the quartz surface, C2O24- chelates with Fe to form a stable complex and is removed by washing and separation. The study established the distribution maps of the complexes at all levels, providing a theoretical basis for the precise control of chemical reactions. In addition, the influence of different treatment methods on the ζ potential of quartz surface was also measured. The results show that the content of metal elements in quartz can be reduced from 40 ~ 50 ppm to 20 ~ 25 ppm by HF and oxalic acid leaching, and the content of elemental Fe is reduced from 2 ppm to 0.186 ppm.