Method for recycling and synchronous harmless treatment of gold, silver and iron in roasting-cyanidation tailings

Abstract

The invention provides a method for recycling and synchronous harmless treatment of gold, silver and iron in roasting-cyanidation tailings, and belongs to the technical field of metallurgical waste residue utilization. The method comprises the following steps: mixing dried roasting-cyanidation tailings with a fluxing agent and a reducing agent; carrying out roasting at 750 to 900 DEG C for 3 to 5 hours; conducting water quenching on hot roasted sand for cooling; carrying out ore grinding and flotation to remove residual carbon; leaching gold and silver with an environment-friendly gold leaching agent; and conducting magnetic separation on the leaching residue to obtain fine iron powder. Containing no highly toxic cyanide, the rejects belong to general industry solid waste. As the fluxing agent is added for magnetic roasting, not only can gold and silver coated with an iron mineral be exposed, but also the fluxing agent can perform a solid-phase reaction with a silicate mineral to generate a dissoluble silicate, and gold and silver coated with the dissoluble silicate can also be exposed after ore grinding. According to the method, gold, silver and iron in the roasting-cyanidation tailings are recycled, harmless treatment is realized synchronously, and the purpose of clean production is realized.

Description

technical field [0001] The invention relates to the technical field of metallurgical waste slag recycling, in particular to a method for recovering gold, silver and iron from cyanided slag and synchronously making them harmless. Background technique [0002] my country has become the world's largest gold producer for nine consecutive years. In 2015, the gold output exceeded 450 tons, and the discharge of cyanide tailings exceeded 10 million tons per year. Among the cyanide tailings produced by different cyanide processes, gold concentrate Roasting-cyanide leaching process mainly produces roasting cyanide tailings. The iron in the roasted cyanidation tailings is mostly hematite, the content of TFe is 25-40wt%, the content of Au is 1.5-5g / t, and the content of Ag is 20-80g / t. In addition, there are valuable components such as Pb and Cu. . Most of the gold and silver in the roasting cyanide tailings are wrapped by iron minerals, and a small amount of gold and silver are wrappe...

AI Technical Summary

Problems solved by technology

This method adopts the high-temperature chlorination method to volatilize gold, and the recovery rate of gold is high, but the high-temperature chlorination volatilization process produces a large amount of highly corrosive and highly toxic chlorine gas and hydrogen chloride gas, the equipment is severely corroded, and the flue gas dust collection and purification process is complex, so industrial application Difficulty, it is necessary to prevent the leakage of toxic gas to prevent personnel from being injured

[0007] To sum up, the current methods of roasting cyanide tailings treatment generally have disadvantages such as high energy consumption, inability to realize clean production, large potential safety hazards in the process, and high processing costs. Therefore, it is proposed to add flux and magnetize roasting-non-cyanide gold and silver-magnetic separation The combined dressing and smelting process, the application of this clean production process, will effectively solve the problem of heavy pollution of roasting cyanide tailings widely existing in the existing gold smelting production, and efficiently recover valuable metal elements

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