Method of treating arsenic-containing solution

摘要

A method of treating an arsenic-containing solution, such as an arsenic-containing solution of high purity and high concentration obtained by treating an arsenic-containing substance wherein various elements other than arsenic are contained, for example, a smelting intermediate occurring in nonferrous smelting to thereby attain recovery as powder of a compound of iron and arsenic exhibiting very low arsenic elution concentration. Ferrous ions are added to a solution containing 10 g/L or more of arsenic so as to adjust the molar ratio of iron to arsenic (Fe/As) in the solution to 1 or higher. An oxidizer is added thereto, and while agitating the same, reaction is carried out at 70°C or above. Thereafter, solid-liquid separation is carried out, and obtained solid contents are dried.