A method of suspending, magnetizing and roasting high ferricyanide tailings to break cyanide and extract iron by magnetic separation

Abstract

A method for suspending, magnetizing and roasting ferricyanide tailings to break cyanide-magnetic separation and extract iron, which is carried out in the following steps: (1) breaking and grinding the ferricyanide tailings; (2) passing it into a pre-oxidation suspension roaster , the high-temperature flue gas enters the pre-oxidation suspension roaster, and the tailings powder is heated to 650-750°C in a suspension state to break the cyanide and roast, and the remaining solid material is the oxide slag powder; (3) The oxide slag powder is passed into the reduction roaster, and the reduction roasting The bottom of the furnace is fed with coal gas and nitrogen, and the oxidized slag powder is in a suspended state and reduced and roasted at 500-600°C, leaving the remaining reduced slag powder; (4) After the reduced slag powder is cooled, a stage of grinding and a stage of weak magnetic separation are carried out; (5) a stage of refining The ore undergoes secondary grinding and secondary weak magnetic separation, and the concentrate of the second stage is iron concentrate. The invention adopts the iron-extracting and cyanide-breaking process by suspending magnetization roasting, which can eliminate the threat of toxic waste water produced by wet cyanide breaking to environmental safety.

Description

technical field

[0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for suspending, magnetizing and roasting ferricyanide tailings to break cyanide and extract iron by magnetic separation. Background technique

[0002] Gold smelting enterprises discharge a large amount of cyanide tailings every year, and their long-term stockpiling not only occupies land, but also pollutes the environment. Cyanide tailings contain valuable metals such as gold, silver, copper, iron, zinc, etc. Among them, the high-ferricyanide tailings TFe grade reaches 30-40%, which is a valuable secondary iron resource. If it cannot be obtained effectively Utilization will cause a waste of resources; but due to the highly toxic cyanide remaining in the cyanide tailings, it is easy to produce cyanide-containing wastewater or waste residues when extracting valuable metals, making it difficult to obtain large-scale utilization; therefore , to develo...

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