Method for comprehensively recycling leaching slag in production of electrolytic manganese metal and manganese dioxide

Abstract

The invention relates to a method for comprehensively recycling leaching slag in production of electrolytic manganese metal and manganese dioxide, and the method comprises the following specific steps of: (1) recovering heavy metals and noble metals; (2) recovering manganese and iron; (3) treating tailing slurry and preparing a composite organic fertilizer; (4) separating trace heavy metals in the composite organic fertilizer; (5) recovering alkaline-earth metal; and (6) carrying out crystal separation on ammonium sulfate. The method can be used for recovering ferromanganese ore concentrate from the leaching slag in production of electrolytic manganese metal and manganese dioxide, thus obtaining the heavy metals such as cobalt, nickel, copper, silver, tin and the like, noble metal ore concentrate, quartz sand, ammonium sulfate, and compound fertilizer base material containing N, P, K, humic acid, trace elements and standard heavy metals; and therefore, a zero emission effect can be realized in the production of electrolytic manganese metal and manganese dioxide.

Description

technical field [0001] The invention belongs to the technology of comprehensive utilization of waste slag, in particular to a method for comprehensive recycling and utilization of leached slag produced in the production process of electrolytic manganese and electrolytic manganese dioxide to achieve zero discharge. Background technique [0002] Most of the production enterprises of electrolytic manganese metal and manganese dioxide use manganese ore or pyrolusite as raw materials to produce metal manganese and electrolytic manganese dioxide through acid leaching. The process produces a large amount of leaching slag, generally about 8 tons per ton of manganese metal Most of the production enterprises directly transport it to the slag storage, because the leaching slag also contains many valuable minerals and heavy metal elements, which not only loses mineral resources, but also takes up a lot of land. And it has buried great hidden dangers for environmental pollution and geolo...

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Problems solved by technology

[0006] Chinese patent name: A new process for efficient and rapid iron removal in manganese ore wet reduction method, application (patent) number: CN201010525307.5 publication (announcement) number: CN101988153A, applicant (patent) person: Hunan University of Science and Technology, address: Hunan Hunan University of Science and Technology, Xiangtan City, Province, Inventor (Designer): Yi Qingfeng; Cai Zhenyong Abstract: Aiming at the problems of difficult iron removal and many filter residues when ferrous sulfate or metallic iron is used as a reducing agent to reduce pyrolusite, a proposed A new technology for efficient and rapid iron removal in acidic solution has been developed, which can not only realize the effective separation of manganese ions in the solution, but also meet the needs of industrial production processes

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