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Method for recovering sliver from silver-bearing waste liquor

A waste liquid recovery and waste liquid technology, applied in the field of metallurgical industry, can solve the problems of incomplete separation of Ag and impurities, high energy consumption of concentrated crystallization method, and narrow application scope, etc. Simple and easy effects

Inactive Publication Date: 2015-01-07
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silver chloride precipitation method needs to consume a large amount of acid, ammonia water, iron powder and other materials. The silver produced by the copper replacement method has low purity and consumes a large amount of Cu, so the cost is high; the concentrated crystallization method consumes a lot of energy, and Ag is separated from impurities. Incomplete, the neutralization hydrolysis method introduces a large amount of ammonia radicals and Na ions into the silver electrolyte, and is only suitable for silver electrolytes with high impurities, and the scope of application is narrow

Method used

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  • Method for recovering sliver from silver-bearing waste liquor

Examples

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Embodiment 1

[0022] 1m the silver-containing waste liquid with a silver ion concentration of 103.15g / L 3 Pump into the purification kettle, start stirring, slowly add NaOH until the end pH of the solution reaches 10-11 to prepare crude silver oxide (Ag: 67.23%; Cu: 6.51%) for later use. Another 1m of silver-containing waste liquid 3 Pump into the purification kettle, turn on the stirring, slowly add the prepared crude silver oxide, when the pH of the solution is measured to be 6.4, turn on the steam, heat it to 80°C and keep it for 1 hour, press filter to obtain 870L of purified liquid, pump it to the precipitation kettle, the test results: Ag + :135.42g / L, Cu 2+ :1.12mg / L, Pb 2+ :3.41mg / L, Bi 3+ : Low; desilver residue is piled up for later use. Turn on the precipitation tank and stir, slowly add industrial-grade NaOH to the end of the solution pH value of 10-11, press filter to obtain a neutralization solution (Ag + : 1.78mg / L) efflux, and refined silver oxide (Ag: 92.97%). After drying t...

Embodiment 2

[0024] 1m the silver-containing waste liquid with a silver ion concentration of 84.48g / L 3 Pump into the purification kettle, start stirring, and slowly add NaOH until the end pH of the solution reaches 10-11 to prepare crude silver oxide (Ag: 63.48%; Cu: 7.15%) for later use. In addition, pump 850L of silver-containing waste liquid into the purification kettle, start stirring, slowly add coarse silver oxide, and when the pH of the solution is measured to be 6.8, turn on the steam, heat it to 80℃ and keep it for 1.5h, press filter to obtain 760L of purified liquid, and pump to Precipitation kettle, test result: Ag + :130.56g / L, Cu 2+ :1.42mg / L, Pb 2+ :3.08mg / L, Bi 3+ :0.22mg / L; the silver removal residue is piled up for later use. Turn on the precipitation tank and stir, slowly add industrial-grade NaOH until the end pH of the solution is 10-11, press filter to obtain the neutralization solution (Ag: 1.78 mg / L) and drain off and refined silver oxide (Ag: 93.01%). After the refi...

Embodiment 3

[0026] 1m the silver-containing waste liquid with a silver ion concentration of 110.14g / L 3 Pump into the purification kettle, start stirring, and slowly add NaOH until the end pH of the solution reaches 10-11 to prepare crude silver oxide (Ag: 68.74%; Cu: 6.43%) for later use. Another 1m of silver-containing waste liquid 3 Pump into the purification kettle, turn on the stirring, slowly add the prepared crude silver oxide, when the pH of the solution is 6.4, turn on the steam, heat it to 80°C and keep it for 1 hour, press filter to obtain 800L of purified liquid, pump it to the precipitation kettle, the test results: Ag + :156.17g / L, Cu 2+ :2.16mg / L, Pb 2+ :4.54mg / L, Bi 3+ : Low; desilver residue is piled up for later use. Turn on the precipitation tank and stir, slowly add industrial-grade NaOH to the end of the solution pH value of 10-11, press filter to obtain a neutralization solution (Ag + : 0.87mg / L) efflux, and refined silver oxide (Ag: 92.94%). After the refined silver ...

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Abstract

The invention relates to a method for recovering sliver from silver-bearing waste liquor. The method concretely comprises the following processing steps: firstly, feeding homemade coarse silver oxide into silver-bearing waste liquor to purify the silver-bearing waste liquor, adjusting the pH value of solution to 6.4 to 6.8, heating the solution to 80 DEG C, keeping the temperature for 1h, and filtering the solution, so as to obtain purified liquor, secondly, ensuring that the quality of the purified liquor meets certain requirement, thirdly, feeding NaOH into the purified liquor, regulating the final pH value of the solution to 10 to 11, and filtering and sufficiently washing the solution till fine silver oxide with the purity being 92.2 to 93.1 percent is obtained, fourthly, performing deoxygenation, and fifthly, performing melting and ingot casting. The method has the advantages of high raw material adaptability, simple technology, little added auxiliary material, low energy consumption, high operability and the like.

Description

Technical field [0001] The invention relates to a metal recovery method in the field of metallurgical industry. Specifically, it is a method for recovering silver from a silver-containing waste liquid. While recovering silver, the valuable metal Cu is further enriched, and belongs to the technical field of chemical industry. Background technique [0002] The silver-containing waste liquid of the present invention includes the high-impurity silver electrolyte, the silver residual electrode washing water and the silver anode sludge silver nitrate solution produced in the silver electrolytic refining process. At present, the more common recovery methods include: (1 1) Precipitate silver chloride first, then replace it with iron powder, or reduce the recovery of silver with hydrazine hydrate-ammonia; (2) Use copper replacement method to recover Ag; (2) Use concentrated crystallization method to make Ag in the form of silver nitrate crystals Recycling and returning to the production o...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 邓远久余秋雁丁旭刘德国张萃李宗兴田惟维董福存肖明金谢海春
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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