METHOD FOR SEPARATING RHENIUM AND ARSENIC, AND METHOD FOR PURIFICATION OF RHENIUM

摘要

The present invention aims at separating and removing arsenic in a stable form from raw material containing rhenium and arsenic, and reducing a circulation amount of arsenic in a rhenium purification process to obtain rhenium with low-content arsenic. A method for separating rhenium from arsenic in a rhenium purification process, wherein the raw material containing rhenium and arsenic is oxidized and leached, and separated into a leachate containing perrhenic, arsenic, and arsenous acids and a leaching residue containing arsenate, followed by purification of rhenium from the leachate, wherein an alkali is added to the leachate to obtain an arsenic-containing precipitate and a rhenium-containing solution, rhenium is separated from the obtained rhenium-containing solution, an alkali is added to either or both obtained arsenic-containing precipitate and the leaching residue containing arsenate to obtain an arsenic-containing solution and a hydroxide precipitate, and arsenic in the obtained arsenic-containing solution is fixed as a precipitate.

主权项

1. A method of separating rhenium and arsenic in a rhenium purification process, the rhenium purification process being such that a raw material containing rhenium and arsenic is oxidized and leached, and separated into a leachate containing perrhenic acid, arsenic acid, and arsenous acid and a leaching residue containing arsenate, followed by purification of rhenium from said leachate,
the method comprising:
a neutralization purification step of adding an alkali to the above-mentioned leachate to obtain an arsenic-containing precipitate and a rhenium-containing solution;a rhenium separation step of separating rhenium from the rhenium-containing solution obtained in the above-mentioned neutralization purification step;a precipitate decomposition step of adding an alkali to either or both the arsenic-containing precipitate obtained in the above-mentioned neutralization purification step and the leaching residue containing the above-mentioned arsenate to obtain an arsenic-containing solution and a hydroxide precipitate; andan arsenic fixing step of fixing arsenic in the arsenic-containing solution obtained in the precipitate decomposition step, as a precipitate.