Study of the properties of indium hydroxide, and the separation of indium from zinc
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A study was made of the solubility of indium hydroxide in sodium hydroxide solutions of various concentrations (0.1–8.0 M).
It was found that the solubility of indium hydroxide in concentrated NaOH solutions does not exceed 2·10−3 mole/liter.
It was shown that in the systems studied, InCl3-NaOH-H2O and In2(SO4)3-NaOH-H2O, no stable soluble or insoluble indates are formed.
Analysis by crystal optics and x-ray diffraction confirmed the individuality of the basic indium salt and the identity of the various indium hydroxide precipitates, irrespective of the concentration of alkali in the system.
The basic salts and indium hydroxide were submitted to thermographic analysis.
A study was made of solubility in the systems ZnSO4-NaOH-H2O; ZnCl2-NaOH-H2O; In2(SO4)3--ZnSO4-NaOH-H2O; InCl3-ZnCl2-NaOH-H2O. The optimum conditions for the separation of indium and zinc in the form of hydroxides were established.
KeywordsSodium Zinc Indium Hydroxide Optimum Condition
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