Harmlessness method for treating arsenic in antimony oxide

The invention relates to a harmlessness method for treating arsenic in antimony oxide, and belongs to the fields of non ferrous metal wet method metallurgy and chemical engineering. The method comprises carrying out selective leaching on antimony oxide and oxidizing to obtain an oxidation-fluid containing arsenic, and adding oxygen and copper sulphate to synthesize copper arsenate. The synthesized copper arsenate can be used for preparation of a wood preservative. The method has the advantages of simpleness, explicitness, strong adaptability of raw materials, small equipment requirement, low production cost and solution of arsenic harm.