A kind of treatment method of silver electrolytic mother liquor alkaline copper precipitation slag

Abstract

The invention relates to the field of smelting of non-ferrous metals, in particular to a treatment method of alkaline copper sediment in silver electrolysis mother liquor, and aims to provide the treatment method to shorten the production cycle, lower energy consumption and increase direct recovery of silver. The treatment method includes the steps of 1, adding hydrochloric acid into the copper sediment, performing stirring to allow reaction for a certain period of time, and filtering a reaction system; 2, adding sodium hydroxide into filtrate obtained in the step 1, keeping pH of the filtrate to 6 to 7, performing filtering after a certain period of time, and feeding filter residue to a copper smelting system to recover copper; 3, adding sodium carbonate solution into the filter residue obtained in the step 1, and performing filtering after a certain period of time to obtain dechlorinated sliver residue; and 4, adding the dechlorinated sliver residue, obtained in the step 3, into a silver-smelting furnace which is used for blow-converting noble lead so as to obtain crude silver satisfactory to electrolytic refining, to be specific, adding the dechlorinated sliver residue after the silver-smelting furnace blow-converts the noble lead and discharges antimony slag.

Description

technical field [0001] The invention relates to the field of nonferrous metal smelting, in particular to a method for treating alkaline copper precipitation slag of silver electrolysis mother liquor. Background technique [0002] In the silver electrolytic refining process, the composition of copper precipitation slag is mainly Ag15%-60%, Cu5%-30%, mainly existing in the form of hydroxide and oxide. [0003] At present, the general recovery method of the copper deposit slag in the silver electrolysis process is to return to the large converter and mix and smelt the lead anode slime. The main chemical components of the lead anode slime are: Ag 2%-15%, Pb 5%-30%, Sb 10% -50%, Bi 5%-20%, Cu0.5%-5%, these metals mainly exist in the form of oxides and salts, silver electrolysis mother liquor alkaline copper precipitation mixed with lead anode slime to dilute silver, economical It is not cost-effective, and at the same time, the copper content increases, which increases the diffi...

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Problems solved by technology

[0003] At present, the general recovery method of the copper deposit slag in the silver electrolysis process is to return to the large converter and mix and smelt the lead anode slime. The main chemical components of the lead anode slime are: Ag 2%-15%, Pb 5%-30%, Sb 10% -50%, Bi 5%-20%, Cu0.5%-5%, these metals mainly exist in the form of oxides and salts, silver electrolysis mother liquor alkaline copper precipitation mixed with lead anode slime to dilute silver, economical It is not cost-effective, and at the same time, the copper content increases, which increases the difficulty of copper removal, and this process takes 18-24h, and the smelting cycle is long, and then it needs to be blown in the silver splitting furnace. In order to remove copper during the blowing process, it is necessary to The temperature rises to 1250°C, add potassium nitrate and blow oxygen for 10-20 hours. Under this condition, silver is easy to volatilize into the dust and cause silver loss.

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