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Method for recovering valuable metals from silver-zinc slag

A valuable metal, silver-zinc slag technology, applied in the direction of improving process efficiency, can solve problems such as unfavorable purification of bismuth chemical products, affecting the quality of electrolytic silver, harsh operating environment, etc., achieving a short and feasible process, reducing the consumption of raw materials, Work environment friendly effect

Active Publication Date: 2014-02-19
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This treatment method uses nitric acid to leach silver-zinc slag. The disadvantages are large acid consumption, poor operating environment and serious environmental pollution. Bismuth nitrate enters the electrolyte and affects the quality of electrolytic silver.
There is also the use of ferric chloride solution to leach silver-zinc slag. The disadvantage of this method is that there will be a large amount of iron ions in the solution, which is not conducive to the purification of bismuth chemical products.
[0003] Recently there are documents ("all-wet process recovery of valuable metals in silver-zinc slag", Gong Zhuqing et al., Journal of Central South University of Technology, No. 5, pages 506, 507, 508, and the publication date is March 2013) to disclose the use of NaClO 3 -NaCl-HCl system for silver-zinc slag leaching process, this process only pays attention to the recovery of gold, silver slag and bismuth, a large amount of zinc metal is discharged as waste liquid, and the environmental pollution is still serious

Method used

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  • Method for recovering valuable metals from silver-zinc slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Reclaim bismuth and silver in the silver-zinc slag according to the following steps:

[0020] (1) 1000g of silver-zinc slag after ball milling, the main components of the analysis slag are: bismuth 65.21%, silver 4.18%, zinc 5.82%, lead 1.07%. Using NaClO 3 -NaCl-HCl system for leaching, the reaction temperature is controlled at 70°C, the liquid-solid ratio is 4:1, NaClO 3 The consumption is 10g / L, the consumption of NaCl is 20g / L, and the consumption of HCl is 80mL / L. After the silver-zinc slag was reacted for 4 hours, it was settled and filtered, and the leaching solution and filter residue were collected respectively. Obtain filter residue 74.65g, silver content is 60.08%;

[0021] (2) While stirring the leaching solution, adjust its pH value to 2.5 with 20% sodium hydroxide solution, stir at room temperature for 1 hour, place it in the sediment and filter, and obtain 1102 g of bismuth oxychloride filter residue containing 54.37% bismuth and zinc chloride solution...

Embodiment 2

[0025] (1) 1000g of silver-zinc slag after ball milling, the main components of the analysis slag are: bismuth 65.21%, silver 4.18%, zinc 5.82%, lead 1.07%. Using NaClO 3 -NaCl-HCl system for leaching, the reaction temperature is controlled at 75°C, the liquid-solid ratio is 6:1, NaClO 3 The consumption is 10g / L, the consumption of NaCl is 40g / L, and the consumption of HCl is 100mL / L. After the silver-zinc slag was reacted for 4 hours, it was settled and filtered, and the leaching solution and filter residue were collected respectively. Obtain filter residue 73.05g, silver content is 63.17%;

[0026] (2) While stirring the leaching solution, adjust its pH value to 3 with a 20% sodium hydroxide solution. After stirring at room temperature for 2 hours, set it aside and filter it to obtain 1089.6 g of bismuth oxychloride filter residue containing 59.64% bismuth and zinc chloride. solution. Adjust the pH value of the zinc chloride solution to 6.5 with soda ash, stir and react ...

Embodiment 3

[0030] (1) 1000g of silver-zinc slag after ball milling, the main components of the analysis slag are: bismuth 65.21%, silver 4.18%, zinc 5.82%, lead 1.07%. Using NaClO 3 -NaCl-HCl system for leaching, the reaction temperature is controlled at 80°C, the liquid-solid ratio is 8:1, NaClO 3 The consumption is 15g / L, the consumption of NaCl is 60g / L, and the consumption of HCl is 120mL / L. After the silver-zinc slag was reacted for 4 hours, it was settled and filtered, and the leaching solution and filter residue were collected respectively. Obtain filter residue 70.07g, silver content is 68.82%;

[0031] (2) While stirring the leaching solution, adjust its pH value to 2.5 with 30% sodium hydroxide solution, stir at room temperature for 3 hours, place it in the sink and filter, and obtain 1009.2 g of bismuth oxychloride filter residue containing 68.2% bismuth and zinc chloride solution. Adjust the pH value of the zinc chloride solution to 7 with soda ash, stir and react at 60°C...

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Abstract

The invention discloses a method for recovering valuable metals from silver-zinc slag. The method is characterized in that the method comprises the following steps: carrying out oxidation leaching of the silver-zinc slag by adopting a NaClO3-NaCl-HCl system through a pre-leaching and leaching stage countercurrent extracting technology; allowing base metals comprising bismuth, zinc and the like to enter a solution, carrying out hydrolysis precipitation to obtain bismuth oxychloride, and precipitating a zinc chloride solution with soda ash to obtain basic zinc carbonate; and enriching gold and silver in slag, and extracting. The method has the advantages of reasonable technology, short and feasible flow, high metal recovery rate, good comprehensive recovery and substantial economic benefit.

Description

technical field [0001] The invention relates to a method for recovering valuable metals in silver-zinc slag, and belongs to the technical field of nonferrous metal wet recovery technology. Background technique [0002] Silver-zinc slag is the scum formed when zinc is used as a collector to collect gold, silver and other impurities during pyro-refining bismuth. Silver-zinc slag contains a lot of silver and bismuth, generally 1-10% of silver, more than 50% of bismuth, and some zinc, copper, lead and a small amount of gold, etc., which has high comprehensive utilization value. At present, there are many methods for the treatment of silver-zinc slag: it can be roughly divided into three treatment methods: fire method, fire method-wet method and all-wet method. Pyrochemical treatment includes: 1. After melting and removing bismuth, it is directly returned to the silver converter for batching or sent to the blast furnace for separate treatment; 2. Silver-zinc slag vacuum distilla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B11/00C22B19/30C22B30/06
CPCY02P10/20
Inventor 柴承平谢兆凤刘万里黄海飞蒋朝金
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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