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A kind of silver leaching method

A technology of leaching and leaching liquid, which is applied in the direction of improving the process efficiency to achieve the effects of high leaching rate, low impurity content and simple operation

Active Publication Date: 2017-12-05
JIANGXI COPPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no literature report on the method of effectively removing chlorine in the circulating mother liquor and preparing silver powder with higher purity in the silver leaching process using sodium sulfite. , A new process that is easy for industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The main components of copper anode slime and gold slag are (%): Ag 22.88, Cu 0.26, Sb3.52, Te 1.65, Pb 9.81, Sn 6.06. Add the above-mentioned gold separation slag into the dechlorinated sodium sulfite solution according to the liquid-solid ratio of 8:1, control the sodium sulfite concentration to 200g / L, and react at a temperature of 30°C for 90 minutes, then filter to obtain silver-containing leaching solution and leaching residue, and leaching The mass percentage of silver contained in the slag is 0.32%. Feed 98% sulfur dioxide gas into the silver-containing leaching solution until the pH is 4, stop feeding sulfur dioxide, continue stirring and reacting for 30min, filter to obtain silver-containing silver chloride precipitate and filtrate of 74.3%. Then add 30% sodium hydroxide solution to the filtrate to adjust the pH of the solution to 8-9, and return to the silver leaching process to leach new silver-containing materials in a circular manner. The obtained silver ...

Embodiment 2

[0028]The main components of copper anode slime and gold slag are (%): Ag 16.55, Cu 0.35, Sb 1.35, Te 1.07, Pb 17.91, Sn 7.03. Add the above-mentioned gold separation slag into the dechlorinated sodium sulfite solution at a liquid-solid ratio of 9:1, control the sodium sulfite concentration to 180g / L, and react at 25°C for 60 minutes, then filter to obtain silver-containing leachate and leaching residue, and leaching The mass percentage of silver in the slag is 0.22%. Feed 98% sulfur dioxide gas into the silver-containing leaching solution until the pH is 6, stop feeding sulfur dioxide, continue stirring and reacting for 90min, filter to obtain silver-containing silver chloride precipitate and filtrate of 74.8%. Then add 30% sodium hydroxide solution to the filtrate to adjust the pH of the solution to 8-9, and return to the silver leaching process to circulate and leach new silver-containing materials. The obtained silver chloride precipitate is added concentrated hydrochlori...

Embodiment 3

[0030] The main components of copper anode slime and gold slag are (%): Ag 25.20, Cu 0.81, Sb0.93, Te1.21, Pb 12.69, Sn 4.98. Add the above-mentioned gold separation slag into the dechlorinated sodium sulfite solution at a liquid-solid ratio of 10:1, control the sodium sulfite concentration to 220g / L, and react at 40°C for 120 minutes, then filter to obtain silver-containing leachate and leaching residue, and leaching The mass percentage of silver contained in the slag is 0.25%. Feed 98% sulfur dioxide gas into the silver-containing leaching solution until the pH is 3, stop feeding sulfur dioxide, continue stirring and reacting for 60 minutes, filter to obtain silver-containing silver chloride precipitate and filtrate of 73.5%. Then add 30% sodium hydroxide solution to the filtrate to adjust the pH of the solution to 8-9, and return to the silver leaching process to circulate and leach new silver-containing materials. The obtained silver chloride precipitate is added concentr...

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Abstract

The invention provides a leaching method of silver. According to the leaching method of the silver, a silver-containing material is first selectively leached by using sodium sulfite, so as to make the silver enter leaching liquor in the form of forming a stable complex; sulfur dioxide is introduced into the silver-containing leaching liquor, so as to make the silver in the leaching liquor form a silver chloride precipitate together with chlorine, thereby realizing the purpose of removing the chlorine in the leaching liquor; afterwards, sodium hydroxide is added into the precipitating leaching liquor to regulate the pH (potential of Hydrogen) value of a solution, so as to realize returning the sodium sulfite to be used for the selective leaching of the silver-containing material after the sodium sulfite is regenerated; afterwards, coarse silver powder is obtained after the silver chloride precipitate obtained in the process is subjected to metallurgical purification treatment and reduction. Compared with the prior art, the leaching method of the silver has the advantages that the adaptability to raw materials is high, the operation is simple, the leaching effect of the silver is good, a silver separating residue contains the silver which is lower than below 0.5 percent, a leaching agent can be recycled, the discharge amount of wastewater is few, the cost is low, the output coarse silver powder is high in purity, and contains the silver which is up to 99 percent or above, the economic benefit is good, and the like.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal hydrometallurgy, and in particular relates to a silver leaching method. Background technique [0002] The anode slime wet treatment process is a method of dissolving gold and silver into an aqueous solution with an appropriate solvent after pretreatment of the anode slime, and then reducing the gold and silver in the solution. Copper, lead, selenium, tellurium, bismuth, arsenic, antimony and other base metals and their compounds in anode slime account for more than 70% of the weight of anode slime. The anode slime wet treatment process must first remove base metals to ensure high-grade Precious metal materials and high recovery rate of precious metals, and comprehensive recovery of valuable metals. There are many anode slime wet treatment processes, but generally speaking, they all include the following main processes: remove base metal impurities to enrich precious metals, and create co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00C22B3/44
CPCC22B3/44C22B7/006C22B11/044Y02P10/20
Inventor 邓成虎黄绍勇孙敬韬黄强吕喜聪
Owner JIANGXI COPPER
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