Comprehensive recovering method for tailings containing precious metal

A recovery method and precious metal technology, applied in the direction of improving process efficiency, can solve the problems of secondary environmental pollution and low recovery rate, and achieve the effect of effective recovery, clean process and environmental protection, and reduced impact

Active Publication Date: 2015-12-09
甘肃高能中色环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although relevant researchers have proposed many treatment methods, the most commonly used method is tailings regrinding-heap leaching, its recovery rate is low, and because cyanide is used again during the process, it is easy to cause secondary pollution to the en

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  • Comprehensive recovering method for tailings containing precious metal

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Example Embodiment

[0021] Example 1 :

[0022] A comprehensive recovery method of noble metal-containing tailings, specifically including the following steps: take 1000g of gold-containing tailings, spread them into a muffle furnace, continuously pass 5% oxygen, control the roasting temperature to 500°C, time 0.5h, and calcine Cooled to 80℃, after the calcine is cooled, the leaching liquid to solid ratio is controlled to 2:1, the mass fraction of sulfuric acid is 5%, the amount of sodium persulfate is 20g / L, the reaction temperature is 60℃, the reaction is 2h, and the filtrate is evaporated and crystallized to obtain the ferric sulfate solution. The mother liquor is returned to leaching, the filter residue is controlled at 2:1, the mass fraction of sulfuric acid is 10%, the amount of sodium chloride is 20g / L, the reaction temperature is 80℃, the reaction is 4h, and it is filtered. The filter residue is sold as lead-rich residue, and the filtrate is replaced with iron powder. The mixed precipitate ...

Example Embodiment

[0024] Example 2 :

[0025] A comprehensive recovery method of noble metal tailings, which specifically includes the following steps: take 1000g gold tailings, spread them into a muffle furnace, continue to inject 15% oxygen, control the roasting temperature of 1000℃, time 6h, and cool the calcine After the calcine is cooled to 150℃, the leaching liquid to solid ratio is controlled to be 8:1, the mass fraction of sulfuric acid is 20%, the amount of ammonium persulfate is 50g / L, the reaction temperature is 60℃, the reaction is 2h, the filtrate is evaporated and crystallized to obtain the ferric sulfate solution, and the mother liquor is evaporated. Back leaching, the filter residue controls the leaching liquid-solid ratio of 3:1, the mass fraction of sulfuric acid is 30%, the amount of sodium chloride is 200g / L, the reaction temperature is 80℃, the reaction is 4h, filtered, the filter residue is sold as lead-rich residue, and the filtrate is replaced with iron powder to obtain gol...

Example Embodiment

[0027] Example 3:

[0028] A comprehensive recovery method of noble metal tailings, which specifically includes the following steps: take noble metal tailings, spread them into a muffle furnace, pass oxygen at 8% by mass of the noble metal tailings, and control the roasting temperature to 600°C for 3h Calcine is cooled to 120℃; calcine and 10% sulfuric acid are added with sulfuric acid according to the solid-liquid mass ratio of 1:4, and sodium persulfate 35g / L is added to the mixture of calcine and sulfuric acid. After reacting at 90℃ for 4 hours, leaching and filtering, the filter residue enriched residue and filtrate ferric sulfate solution are obtained. The filtrate is evaporated and crystallized to obtain industrial ferric sulfate. In the enriched residue, 20% sulfuric acid is added according to the solid-liquid mass ratio 1:3. , Then add 150g / L of sodium chloride to the mixture of enriched residue and sulfuric acid, at 90℃, react for 2h, filter to obtain the lead-rich resi...

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Abstract

The invention discloses a comprehensive recovering method for tailings containing precious metal. The comprehensive recovering method specifically includes the following steps that the tailings are led into oxygen to be subjected to oxidizing roasting; oxidation leaching is conducted on zinc calcine through sulfuric acid, most of iron is removed, a leaching agent is evaporated and crystallized, and industrial iron sulfate is obtained; after chloridizing leaching is conducted on leaching slag through sulfuric acid and sodium chloride, the leaching slag serves as lead-rich slag to be sent to a lead smelting enterprise; replacement is conducted on the leaching agent through iron powder, and crude gold and silver mixtures are obtained and sent to a precious metal deep processing system; and PH of replacement fluid is adjusted through ammonium water or sodium hydroxide, iron is deposited, obtained ferric hydroxide is roasted to obtain iron oxide red, and the iron oxide red serves as the raw material of the coating industry. According to the technology method, the influences on the environment due to long-term stacking of the kind of slag are eliminated, the process is clean and environmentally friendly, and secondary pollution is avoided.

Description

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Claims

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Application Information

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Owner 甘肃高能中色环保科技有限公司
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