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Recovery of cupric sulphate from spent etching solns. - by precipitating cupric oxide and dissolving in sulphuric acid
Recovery of cupric sulphate from spent etching solns. - by precipitating cupric oxide and dissolving in sulphuric acid
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机译：从废蚀刻液中回收硫酸铜。 -通过沉淀氧化铜并溶解在硫酸中
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摘要
Cupric sulphte is recovered from spent etching solns. (in mfr. of printed circuits) by a process comprising: (a) oxidation of Cu+ ions (if present) to Cu2+ with H2O2; (b) precipitation of CuO with an alkali hydroxide soln.; (c) sepn. of CuO by filtration; and (d) reaction between CuO and H2SO4 to produce CuSO4. High purity solns. (after simple purification, if necessary) are obtained; they can be re-used in the prodn. of electric lead plates by the subtractive or additive technique, or in other chemical or electrochemical copper-deposition processes.
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