| 摘要 |
<p>1,131,726. Copper recovery. COMMONWEALTH SCIENTIFIC & INDUSTRIAL RESEARCH ORGANIZATION. 25 Jan., 1967 [25 Jan., 1966], No. 3797/67. Heading C1A. Copper is recovered from a solution containing copper sulphate by (1) mixing with sufficient aqueous magnesium or alkali metal bisulphite, at at least 40‹ C., to give a pH of 1 to 3, thereby precipitating Chevreul's salt (Cu 2 SO 3 .CuSO 3 . 2H 2 O) from which copper is recovered; and (2) mixing the liquor with aq. calcium bisulphite to precipitate calcium sulphate and leave aq. magnesium or alkali metal bisulphite which is recycled. The calcium bisulphite solution used in (2) may be produced by mixing limestone with part of the magnesium or alkali metal bisulphite produced in (2) and saturating with SO 2 . The original CuSO 4 solution may contain Mg, Zn, Mn, Co, Ni, Cr or Al values which remain in solution. Copper may be produced by calcining Chevreul's salt at 200‹ to 350‹ C. and reducing the cupro-cupric oxide residue.</p> |
