Separation of natural trivalent oxides of arsenic and antimony

Add time:07/22/2019    Source:sciencedirect.com

It is demonstrated that arsenic oxide can be extracted from materials containing also antimony oxide using a mixed solvent of 1-butanol and n-heptane. The condition is that water generated as a result of esterification is completely removed from the reaction zone as an azeotrope. The ternary liquid system water + n-heptane + 1-butanol forms three binary azeotropes and a ternary saddle azeotrope. Hydrolysis of tributyl arsenite gives As2O3 with a 90–92% yield. The yield of Sb2O3 is almost 100%. The organic heptane + butanol mixture can be used for re-extraction of arsenic (III) from a new portion of the mixture of oxides. Thus, the process is cyclic and economically viable; it does not involve high temperature metal roasting harmful for the environment; energy costs of the process are much lower than those of roasting.

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