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A method for recovering and neutralizing valuable metals in waste residue by using cyanide-containing wastewater

A technology for valuable metal and cyanide wastewater, applied in the direction of improving process efficiency, can solve problems such as waste of resources and negative environmental impact, and achieve the effects of eliminating the harm of heavy metals, improving economic benefits, and simplifying the process flow

Active Publication Date: 2018-10-19
SHANDONG GUODA GOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used raffinate treatment method is to directly neutralize lime or calcium carbide slag to produce neutralized waste residue, then aerate to remove iron, and then go through coarse filtration and fine filtration. The filtrate is returned to the process for reuse, and the filter residue is transported to the tailings pond. However, the valuable metals in the neutralized waste slag have not been effectively recovered, which not only causes a huge waste of resources, but also has a relatively large negative impact on the environment.

Method used

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  • A method for recovering and neutralizing valuable metals in waste residue by using cyanide-containing wastewater

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Effect test

Embodiment 1

[0027] A method for utilizing cyanide-containing wastewater to reclaim and neutralize valuable metals in waste residues, comprising the steps of:

[0028] 1) Generation of neutralized waste residue: the copper-zinc-containing gold and silver concentrate is mixed with water, and roasted with oxygen in the air in a fluidized roaster with slurry feed, and the high-temperature flue gas generated by roasting enters the sulfuric acid production process. After roasting, the calcined sand is pickled with dilute sulfuric acid, and the copper-containing acid leaching solution is produced into the extraction electrowinning process. The extracted solution is the copper extraction residue, and the copper extraction residue is treated by lime neutralization. The final solid matter is called neutralization waste residue; the main components of neutralization waste residue are 0.8g / t of gold, 1wt% of copper, 2wt% of zinc, and 6wt% of iron;

[0029] 2) pulping and leaching: the neutralization ...

Embodiment 2

[0034] A method for utilizing cyanide-containing wastewater to reclaim and neutralize valuable metals in waste residues, comprising the steps of:

[0035] 1) Generation of neutralized waste residue: the copper-zinc-containing gold and silver concentrate is mixed with water, and roasted with oxygen in the air in a fluidized roaster with slurry feed, and the high-temperature flue gas generated by roasting enters the sulfuric acid production process. After roasting, the calcined sand is pickled with dilute sulfuric acid, and the copper-containing acid leaching solution is produced into the extraction electrowinning process. The extracted solution is the copper extraction residue, and the copper extraction residue is treated by lime neutralization. The final solid matter is called neutralization waste residue; the main components of neutralization waste residue are 1.4g / t gold, 1.5wt% copper, 3wt% zinc, and 8wt% iron;

[0036]2) pulping and leaching: the neutralized waste residue ...

Embodiment 3

[0041] A method for utilizing cyanide-containing wastewater to reclaim and neutralize valuable metals in waste residues, comprising the steps of:

[0042] 1) Generation of neutralized waste residue: the copper-zinc-containing gold and silver concentrate is mixed with water, and roasted with oxygen in the air in a fluidized roaster with slurry feed, and the high-temperature flue gas generated by roasting enters the sulfuric acid production process. After roasting, the calcined sand is pickled with dilute sulfuric acid, and the copper-containing acid leaching solution is produced into the extraction electrowinning process. The extracted solution is the copper extraction residue, and the copper extraction residue is treated by lime neutralization. The final solid matter is called neutralization waste residue; the main components of neutralization waste residue are 2.0g / t of gold, 2wt% of copper, 4wt% of zinc, and 10wt% of iron;

[0043] 2) pulping and leaching: the neutralized wa...

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Abstract

The invention relates to a method for recycling valuable metal from neutralized waste residue by utilizing cyanide-containing wastewater. The method comprises the following steps: performing pulp mixing on the cyanide-containing wastewater and the neutralized waste residue, adding potassium permanganate into the ore pulp, filling the ore pulp with air for aeration, and stirring for leaching reaction; after completion of leaching, washing and filtering the product to obtain leaching residue and a filtrate; enabling the filtrate to be subjected to oxidation and sulfide precipitation reaction, performing filter pressing to obtain copper-zinc mixed precipitate and a precipitation solution after completion of reaction, adding powdered activated carbon into the precipitation solution, stirring for reaction, filtering to obtain gold-bearing activated carbon after completion of reaction, recycling gold and silver from the gold-bearing activated carbon by adopting the gold and silver fire smelting process, regulating the pH of the filtrate, and returning the filtrate back into a production system for reuse. According to the method for recycling valuable metal from neutralized waste residue by utilizing cyanide-containing wastewater, cyanide-containing wastewater generated in the cyanidation gold extraction process and neutralized waste residue are fully utilized and subjected to first-stage pulp mixing and leaching, second-stage washing and filtering, third-stage oxidation and sulfide precipitation, the precipitation solution is subjected to fourth-stage carbon adsorption treatment process, and purified clean water is returned back into the production system for cyclic utilization.

Description

technical field [0001] The invention relates to a method for recovering valuable metals in neutralization waste residues of gold and silver concentrates, in particular to a method for recovering valuable metals in neutralization waste residues by using cyanide-containing wastewater. Background technique [0002] At present, my country's gold production mainly uses the cyanide method to extract gold and silver. Although cyanide extraction of gold and silver is an economical and effective method, since cyanide leaching is used to extract gold and silver, and cyanide is a highly toxic chemical, waste water will be produced after cyanide leaching. Liquid discharge and treatment require a lot of treatment costs, so after cyanidation leaching and gold extraction, the barren solution is returned to the system for recycling. In this way, with continuous recycling, heavy metals such as copper and zinc in the cyanide system are gradually enriched in the leaching solution to form corr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00C22B15/00C22B19/20C22B19/30
CPCC22B7/006C22B11/042C22B15/0065C22B15/0089C22B19/20C22B19/26C22B19/30Y02P10/20
Inventor 徐永祥王建政王其亮孔令强朱德兵邵国强郭建东
Owner SHANDONG GUODA GOLD