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Method for treating cyanidation tailings by adopting anaerobic roasting-persulfate leaching combined technology

A technology of cyanide tailings and persulfate, applied in the field of metallurgy and beneficiation, can solve the problems of complex iron recovery process, low product value, neglect of recovery, etc., and achieve the effect of easy oxidation and dissolution and unstable chemical properties.

Pending Publication Date: 2022-07-12
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above researches all recover iron from cyanidation tailings by optimizing the flotation process, but the sulfur concentrate recovered by flotation is usually used to prepare sulfuric acid, and the product value is low. After acid production, iron enters the sulfuric acid slag, and the subsequent recovery of iron The process is complicated, and at the same time, the recovery of fine particles wrapped in gold in the tailings is ignored

Method used

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  • Method for treating cyanidation tailings by adopting anaerobic roasting-persulfate leaching combined technology
  • Method for treating cyanidation tailings by adopting anaerobic roasting-persulfate leaching combined technology
  • Method for treating cyanidation tailings by adopting anaerobic roasting-persulfate leaching combined technology

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Effect test

Embodiment 1

[0055] The present embodiment adopts anaerobic roasting-persulfate leaching combined technology to process the method for cyanide tailings, comprising the following steps:

[0056] (1) Dry the cyanide tailings raw material at a drying temperature of 60° C. to ensure that the moisture content of the raw material is less than or equal to 3%.

[0057] (2) Take 15g of the dried sample, put it in a porcelain boat and place it in a quartz tube, put the quartz tube in a tube furnace, pass nitrogen for 20 minutes to discharge the air, and close the air inlet. Turn on the tube furnace for roasting, heat up to 600 °C, keep it for 1 hour, and then cool down to room temperature with the furnace. After cooling, collect the sulfur product on the quartz tube and the product collection bottle. Weigh the condensate and calcine respectively, and analyze the condensation. According to the S and Fe grades of calcine and calcine, the mass loss rate and S recovery rate during the roasting process a...

Embodiment 2

[0072] The present embodiment adopts anaerobic roasting-persulfate leaching combined technology to process the method for cyanide tailings, comprising the following steps:

[0073] (1) Dry the cyanide tailings raw material at a drying temperature of 62° C. to ensure that the moisture content of the raw material is less than or equal to 3%.

[0074] (2) Take 15g of the dried sample, put it in a porcelain boat and place it in a quartz tube, put the quartz tube in a tube furnace, pass nitrogen for 20 minutes to discharge the air, and close the air inlet. Turn on the tube furnace for roasting, heat up to 600°C, keep the temperature for 6 hours, and then cool down to room temperature with the furnace. After cooling, collect the sulfur product on the quartz tube and the product collection bottle. Weigh the condensate and calcine respectively, and analyze the condensation. The S and Fe grades of the calcined material and calcine were calculated, and the mass loss rate and S recovery ...

Embodiment 3

[0078] The present embodiment adopts anaerobic roasting-persulfate leaching combined technology to process the method for cyanide tailings, comprising the following steps:

[0079] (1) Dry the cyanide tailings raw material at a drying temperature of 58° C. to ensure that the moisture content of the raw material is less than or equal to 3%.

[0080] (2) Take 15g of the dried sample, put it in a porcelain boat and place it in a quartz tube, put the quartz tube in a tube furnace, pass nitrogen for 20 minutes to discharge the air, and close the air inlet. Turn on the tube furnace for roasting, heat up to 700 °C, keep it for 1 hour, and then cool down to room temperature with the furnace. After cooling, collect the sulfur product on the quartz tube and the product collection bottle. Weigh the condensate and calcine respectively, and analyze the condensation. The S and Fe grades of the calcined material and calcine were calculated, and the mass loss rate and S recovery rate during t...

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Abstract

The invention discloses a method for treating cyanidation tailings by adopting an anaerobic roasting-persulfate leaching combined technology, which comprises the following steps: roasting dried cyanidation tailings in an anaerobic environment, controlling the temperature to pyrolyze pyrite to remove part of sulfur and convert the part of sulfur into pyrrhotite, and condensing sulfur steam to directly recover a sulfur product. Roasting slag is prepared into ore pulp, the ore pulp is oxidized and leached through persulfate, pyrrhotite in roasted sand can effectively activate the persulfate to generate SO4 <-> and OH <->, iron is leached through self-activation of the persulfate under the condition that an activating agent is not additionally added, and Fe ions in leachate are prepared into ferrous oxalate through the extraction-reverse extraction-photocatalysis technology. And after the gold-containing cyanidation tailings are treated, wrapping gold can be exposed and enriched to a great extent and can be further leached and recycled. According to the technology, pollution caused by SO2 emission in the cyanidation tailing treatment process is completely eradicated, meanwhile, enrichment and recovery of residual gold and value-added utilization of iron can be achieved, and the technology has important significance on recycling and reduction of the cyanidation tailings.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and beneficiation, and in particular relates to a method for treating cyanide tailings by adopting the combined technology of anaerobic roasting and persulfate leaching. Background technique [0002] As a typical solid waste generated in the field of gold beneficiation, cyanide tailings have the characteristics of large output and difficult treatment. Cyanide tailings all contain a certain degree of sulfur, iron, copper, lead and other resources and some highly toxic cyanide. The disposal method of piling up or filling up not only occupies a lot of land, but also pollutes the surrounding water and soil, and also causes a lot of waste of resources. [0003] Due to the geochemical properties of gold, which are ferrophilic and sulphurophilic, pyrite is the most important gold-carrying mineral. The gold, silver and other precious metals remaining in the cyanide tailings of gold flotation concentra...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B11/00C01B17/06C07C51/41C07C55/07
CPCC22B7/006C22B11/042C22B1/02C01B17/06C07C51/412C07C55/07Y02P10/20
Inventor 宋永辉董萍包进朱荣燕
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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