Method for wet separation and recovery of valuable metal from Kaldo furnace smelting slag

Abstract

The invention discloses a method for wet separation and recovery of valuable metal from Kaldo furnace smelting slag. Kaldo furnace smelting slag is ground and dipped in water to remove soluble salt; copper, selenium and tellurium in the slag are leached out by using pressurization, oxidation and acid leaching for treatment to obtain copper sulfate solution, silver-selenium slag and copper telluride slag; tellurium, silver and selenium can be respectively recovered from the silver-selenium slag and the copper telluride slag; pressurized copper removing filter residue is mixed with hydrochloric acid for leaching out antimony and bismuth to finally obtain lead-silver slag capable of returning to a Kaldo furnace for smelting; and antimony and bismuth are further recovered from antimony-bismuth solution. According to the method, a mode of stepped removal and recovery of such metal as copper, antimony, bismuth, selenium, tellurium, silver and lead enriched in the Kaldo furnace smelting slag is adopted, compatibility of the method with a wet-fire combined flow for recovering rare and noble metal from Kaldo furnace treatment copper anode mud is excellent, the smelting slag is enabled to return to the Kaldo furnace for smelting so as to prevent adverse effects on the copper smelting by returning to a copper smelting system, and the lead-silver slag with higher enriching degree of such valuable metal as lead and silver is obtained.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgical engineering, and in particular relates to a method for wet separation and recovery of valuable metals in smelting slag of a Kaldor furnace. Background technique [0002] Kaldor furnace smelting generally produces three types of slag: smelting slag, blowing slag and refining slag. At present, the processing method of Kaldor slag at home and abroad is to return the blowing slag and refining slag to the Kaldor furnace for processing, and return the smelting slag to copper Smelting main system processing. The small amount of blowing slag and refining slag returned to the Kaldor furnace will not bring adverse effects, but the amount of smelting slag is large and contains a large amount of copper, gold, silver, antimony, bismuth, tellurium, selenium, tin and other non-ferrous metals and rare precious metals. This brings two unfavorable factors: the one, a large amount of smelting slag return...

AI Technical Summary

Problems solved by technology

The small amount of blowing slag and refining slag returned to the Kaldor furnace will not bring adverse effects, but the amount of smelting slag is large and contains a large amount of copper, gold, silver, antimony, bismuth, tellurium, selenium, tin and other non-ferrous metals and rare precious metals. This brings two unfavorable factors: the one, a large amount of smelting slag returns copper smelting system and can cause lead to form vicious cycle in large system, influences copper smelting system and copper electrolysis system, and seriously affects the quality of anode copper and cathode copper; The copper smelting system can only recover gold and silver, but cannot recover rare and precious metals rich in smelting slags such as lead, antimony, bismuth, tellurium and selenium

The patent CN102732735A aims at the problems existing in the conventional technology, and proposes to remove base metals such as silicon, lead, and barium step by step to separate gold and silver from base metals, effectively enrich gold and silver, and then further recover gold and silver, but this process It is lengthy and complicated, consumes a lot of equipment and raw materials, and does not consider the recovery of antimony, bismuth, selenium, tellurium and other metals in the smelting slag.

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