Method for efficiently recycling manganese in zinc anode mud in short process

Abstract

The invention discloses a method for efficiently recycling manganese in zinc anode mud in a short process. The method comprises the following specific steps of: primary size mixing: uniformly mixing and stirring zinc calcine neutral leaching liquid of a zinc smelting system and the zinc anode mud; primary reduction reaction: feeding ore pulp into a primary reduction reaction kettle, and enabling sulfur dioxide-containing flue gas obtained by the zinc smelting system to be in contact reaction with the ore pulp; and after the reaction is finished, merging obtained supernatant A into a medium leaching thickening system, and enabling the supernatant A to enter a zinc electrolysis system after purification for supplementing Mn < 2+ > in the zinc electrolysis system; secondary size mixing: uniformly mixing and stirring the zinc calcine neutral leaching liquid and zinc calcine of the zinc smelting system; secondary absorption reaction: introducing the ore pulp obtained by secondary size mixing and tail gas subjected to the primary reduction reaction into a secondary reaction kettle for reduction absorption to obtain absorption ore pulp B, and directly merging the absorption ore pulp B into a high-acid leaching system. According to the method disclosed by the invention, manganese dioxide in the zinc anode mud is reduced by utilizing sulfur dioxide produced by a zinc smelting and roasting acid plant, and the reduced liquid is merged into the leaching system to maintain the Mn < 2+ > balance of the system.

Description

technical field [0001] The invention relates to the technical field of resource recovery, in particular to a short-process and high-efficiency recycling method for manganese in zinc anode slime. Background technique [0002] Zinc hydrometallurgy mainly includes processes such as roasting, leaching, leachate purification and electrowinning. After the zinc concentrate is roasted, the zinc calcined sand is neutrally leached with electrolytic waste liquid to dissolve most of the zinc oxide, and the obtained pulp is separated into a supernatant And the bottom flow pulp, after the supernatant is purified, electrowinning produces metal zinc, which is melted and cast into ingots, the bottom flow pulp is subjected to acid leaching to dissolve the residual zinc oxide, and the acid leachate returns to neutral leaching. A large amount of anode slime will be produced in the anode during the electrowinning process of the wet zinc smelting plant, generally containing Mn30-40%, Pb10-20%, Ag...

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Problems solved by technology

[0004] In order to rationally utilize Mn in zinc anode slime, scholars have studied the process of mixing zinc electrolytic anode slime with reduced coal for reduction roasting, so that manganese dioxide is reduced to manganese oxide, and then leached with sulfuric acid to obtain manganese sulfate, Pb and Ag enter The leached slag is separated from the Mn. Since the amount of reduced coal added is more than 1.5 times the amount of Mn, the excess coal does not participate in the reduction reaction and enters into the lead sulfate slag during leaching to reduce the quality of the lead sludge (lead sulfate slag). During reduction roasting, the exhaust gas contains a large amount of sulfuric acid and sulfur dioxide, which corrodes roasting equipment and pollutes the environment, so the process has not been widely used

Some scholars have studied the use of flotation and re-election methods to deal with zinc electrolysis anode slime. Although the content of manganese dioxide flotation concentrate is as high as 80%, the flotation rate is not high, and it is still difficult to process a large number of flotation ore and tailings. When zinc electrolytic anode slime is reduced to smelt lead-silver alloy, since manganese dioxide is an oxidant, a large amount of reducing agent is consumed, and Mn enters the smelting slag and cannot be recovered

At present, scholars focus on the reductive leaching of manganese, adding sulfite (mainly sodium sulfite or zinc sulfite) or introducing sulfur dioxide when leaching anode slime with sulfuric acid for reductive leaching, but most of the existing technologies are based on The purpose is to recycle manganese in anode slime to make related products, and the matching degree with the existing zinc smelting system is low, and the cost of leaching is high, the amount of wastewater is large, and the economic benefits are not obvious

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