Method of recovering manganese, lead and silver from zinc electrolyzed anode mud by utilizing acid-making tail gas

Abstract

The invention discloses a method of recovering manganese, lead and silver from zinc electrolyzed anode mud by utilizing acid-making tail gas, aiming at recovering valuable metals such as manganese, lead and silver from zinc electrolyzed anode mud by utilizing acid-making tail gas containing SO2 and simultaneously solving the environmental problems of SO2 tail gas and slag. The method is characterized by comprising the following steps: A, pulping: grinding zinc electrolyzed anode mud and water into anode mud pulp by a globe mill; B, leaching: introducing the acid-making tail gas containing SO2 into the anode mud pulp; C, filtering products of step B to produce a solution containing manganese ions and slag containing lead and silver; and D, recovering: returning the solution containing manganese ions produced in step C to a zinc electrolyzing procedure or for producing manganese sulfate and electrolytic manganese, and sending the produced lead and silver slag to a lead blast furnace for recovering the lead and the silver. The invention mainly used for simultaneously solving two environmental problems of slag and gas in wet-process zinc-making factories.

Description

technical field [0001] The invention relates to a method for recovering manganese, lead and silver, in particular to a method for recovering manganese, lead and silver from zinc electrolysis anode slime by using acid production tail gas. Background technique [0002] The electrolysis process of zinc hydrometallurgy is to purify ZnSO 4 The solution is sent to the electrolytic cell for electrolysis, Zn 2+ Zinc is precipitated on the cathode of the aluminum plate, and the anode is an insoluble anode made of a lead plate containing a small amount of silver. During the electrolysis process, anode slime containing manganese, lead, and silver will be produced on the anode plate (because the zinc electrolyte also contains Mn 2+ , its role is to protect the anode), the traditional method is to return the anode slime produced by electrolysis directly to the leaching process, and its disadvantages are: manganese enters the leaching slag and rarely enters the leaching solution and cann...

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Problems solved by technology

[0002] The electrolysis process of zinc hydrometallurgy is to purify ZnSO 4 The solution is sent to the electrolytic cell for electrolysis, Zn 2+ Zinc is precipitated on the cathode of the aluminum plate, and the anode is an insoluble anode made of a lead plate containing a small amount of silver. During the electrolysis process, anode slime containing manganese, lead, and silver will be produced on the anode plate (because the zinc electrolyte also contains Mn 2+ , its role is to protect the anode), the traditional method is to return the anode slime produced by electrolysis directly to the leaching process, and its disadvantages are: manganese enters the leaching slag and rarely enters the leaching solution and cannot be recycled, and a large amount of manganese powder is still required for leaching (MnO 2 or MnCO 3 ), leading to high cost of electrolytic zinc; the lead and silver in the anode slime are also difficult to recover after entering the leaching residue (lead can be recovered partly through the volatilization kiln); the sulfuric acid section contains SO 2 Acid production tail gas (or containing SO 2 The leakage of industrial waste gas) is also a difficult problem in pollution control

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