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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 environment, the patent "roasting—— "Comprehensive recovery process of valuable metals in cyanidation gold-containing tailings" (CN102168176A) uses the iron in it to produce ferric chloride water purifier, which has problems with product quality and market acceptance

Method used

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  • Comprehensive recovering method for tailings containing precious metal

Examples

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Effect test

Embodiment 1

[0022] A method for comprehensive recovery of tailings containing precious metals, specifically comprising the following steps: take 1000g of tailings containing gold, lay them flat in a muffle furnace, continuously feed 5% oxygen, control the roasting temperature at 500°C for 0.5h, and bake the sand Cool to 80°C, after the calcine is cooled, control the leaching liquid-solid ratio to 2:1, the mass fraction of sulfuric acid is 5%, the dosage of sodium persulfate is 20g / L, the reaction temperature is 60°C, react for 2h, filter, evaporate and crystallize the filtrate to obtain ferric sulfate solution, evaporate Back leaching of the mother liquor, control the leaching liquid-solid ratio of the filter residue to 2:1, mass fraction of sulfuric acid 10%, sodium chloride dosage 20g / L, reaction temperature 80°C, react for 4 hours, filter, filter residue is sold as lead-rich slag, and the filtrate is obtained by replacing it with iron powder The gold and silver mixed precipitate is sent...

Embodiment 2

[0025] A method for comprehensive recovery of tailings containing precious metals, specifically comprising the following steps: take 1000g of tailings containing gold, lay them flat in a muffle furnace, continuously feed 15% oxygen, control the roasting temperature at 1000°C for 6 hours, and cool the calcination To 150°C, after cooling the calcine, control the leaching liquid-solid ratio to 8:1, the mass fraction of sulfuric acid is 20%, the dosage of ammonium persulfate is 50g / L, the reaction temperature is 60°C, react for 2h, filter, evaporate and crystallize the filtrate to obtain ferric sulfate solution, and evaporate the mother liquor Back leaching, filter residue control leaching liquid-solid ratio 3:1, mass fraction of sulfuric acid 30%, sodium chloride dosage 200g / L, reaction temperature 80°C, react for 4h, filter, filter residue is sold as lead-rich residue, filtrate is replaced with iron powder to obtain gold Silver and silver mixed precipitates are sent to the precio...

Embodiment 3

[0028] A comprehensive recovery method for tailings containing precious metals, specifically comprising the following steps: taking tailings containing precious metals, laying them flat in a muffle furnace, introducing oxygen with a mass percentage of 8% of the tailings containing precious metals, and controlling the roasting temperature to 600°C for 3 hours , the calcined sand is cooled to 120°C; the calcined sand and sulfuric acid with a mass fraction of 10% are added to the calcined sand with sulfuric acid at a solid-to-liquid mass ratio of 1:4, and 35 g / L of sodium persulfate is added to the mixture of calcined sand and sulfuric acid, At 90°C, react for 4 hours, leaching, and filter to obtain the enriched residue of the filter residue and the ferric sulfate solution of the filtrate. The filtrate is evaporated and crystallized to obtain industrial ferric sulfate. Add sulfuric acid with a mass fraction of 20% to the enriched residue at a solid-to-liquid mass ratio of 1:3 , th...

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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

technical field [0001] The invention belongs to the field of comprehensive recovery and utilization of smelting waste slag, and in particular relates to a comprehensive utilization process technology for tailing slag containing precious metals. Background technique [0002] With the continuous development and utilization of mineral resources, the available metal resources are less and less, and the comprehensive utilization of secondary resources such as tailings and tailings has attracted more and more attention. These precious metal tailings are part of the tailings left over from history. The quantity is relatively large. At that time, due to technical reasons or processes and local special climate conditions and other factors, the gold content in the tailings was about 1g / t, and the silver content was about 40g / t. The main component of the tailings was Au , Ag, the content of other elements (Cu, Pb, Zn,) is very low, which cannot reach the comprehensive utilization index...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/02C22B3/46C22B11/00
CPCY02P10/20
Inventor 鲁兴武陈一博陈文波李俞良韩晓龙马爱军易超程亮何国才张恩玉李贵曹桂银
Owner 甘肃高能中色环保科技有限公司
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