VERFAHREN ZUM GEWINNEN VON KUPFER AUS EINEM METALLSALZGEMISCH

摘要

1379462 Producing copper sulphites KENNICOTT COPPER CORP 7 June 1972 [10 June 1971] 26605/72 Heading C1A Cu is recovered from metal salt mixtures containing salts of Cu and metals more electropositive than Cu, e.g. ammoniacal leach solutions containing salts of Cu, Ni, Co, by dissolving 25-75% of the mixture in HCl at a pH preferably between 0 and 1À5, and reducing the remainder of the mixture, preferably by H 2 , CO, or both, to a metallic precipitate. The precipitate is added to the chloride solution and heated after adding an amount of fine sulphur such that the wt. ratio of Cu to S is 2À9 to 4À0. The Cu is precipitated as Cu 2 S and the precipitate can have a Cu : Ni ratio of 100 : 1, the filtrate containing the Ni and Co. In an example, the precipitate is treated again with the chloride solution and the precipitate resulting had a Cu : Ni : Co ratio of 100 : 0À07 : 0À05. In the above examples, the metal salt mixture is of carbonates, but other salts, e.g. chlorides, sulphates, can be used. Other salts of metals more electro-positive than Cu may be present in the mixture instead of Co and Ni salts, e.g. an Fe salt.