Method for recovering lead, gold and solver from silver separation slag

A technology for separating silver slag and sinking lead, which is applied in the field of copper smelting, can solve problems such as increased quality impact, low economic value, and demanding process conditions, and achieve the effects of no environmental pollution, simple process operation, and optimized process parameters

Active Publication Date: 2020-06-19
烟台国润铜业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the cyanide method can be used to directly leach gold and silver in the silver-separating slag, but because the cyanide used in this method is a highly toxic substance, the process conditions are harsh, the recovery cost is high, and because the precious metals in the silver-separating slag The content is low, so basically no smelters use this method to recover gold and silver in silver slag
At present, some smelters directly sell the silver slag, but the silver slag contains high lead and is a hazardous waste product with low economic value and difficult sales channels.
There are also some smelters that directly return the silver-separated slag to the smelting process as the raw material for the furnace. The recovery rate of precious metals is low, and the silver-separated slag with high lead content is returned to the smelting process, which has a greater impact on the main quality of copper smelting and increases the processing load of the smelting process. And energy consumption, smelting cost increase
When the silver slag is returned to the smelting process, the lead oxide is volatile and discharged with the flue gas, resulting in a waste of lead resources, and the emission of the flue gas into the air will also cause environmental pollution

Method used

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  • Method for recovering lead, gold and solver from silver separation slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The main components of the silver-separating slag are (by weight): 0.0038% of Au, 0.573% of Ag, and 32.03% of Pb. Take by weighing 800g of the above-mentioned silver separation slag, add it into the beaker according to the liquid-solid ratio of 3:1, then add a sodium carbonate solution with a concentration of 0.75mol / L in the beaker, stir for 1 hour at normal temperature and normal pressure, filter, and obtain the conversion liquid and 782g conversion residue. After testing, the conversion liquid contained 0.021g / L of lead. Main components of conversion slag (by weight percentage): Au 0.0038%, Ag 0.586%, Pb 32.40%.

[0026] Under the condition of normal temperature and normal pressure, add the above 782g of conversion slag into the beaker according to the liquid-solid ratio of 3:1, and start stirring. While stirring, add nitric acid dropwise, until the pH of the solution is ≤1, stop adding nitric acid dropwise. After reacting for 1 hour, filter and wash to obtain 318g...

Embodiment 2

[0030] The main components of the silver separating slag are (by weight percentage): Au 0.0035%, Ag 0.56%, Pb 32.09%. Take by weighing 800g of the above-mentioned silver slag, add it to the beaker at a liquid-solid ratio of 5:1, then add a sodium carbonate solution with a concentration of 0.94mol / L to the beaker, stir for 2 hours at normal temperature and pressure, filter to obtain the conversion solution and 764g of conversion residue. After testing, the conversion liquid contained 0.021g / L of lead. Main components of conversion slag (by weight percentage): Au 0.0040%, Ag 0.60%, Pb 33.16%.

[0031] Under normal temperature and normal pressure conditions, add 764g of the above-mentioned conversion slag into the beaker according to the liquid-solid ratio of 4:1, and start stirring. While stirring, add nitric acid dropwise, and stop adding nitric acid dropwise until the pH of the solution is ≤1. After reacting for 2 hours, filter and wash to obtain 225g of lead slag and 4550ml...

Embodiment 3

[0035] The main components of the silver-separating slag are (by weight): 0.0034% of Au, 0.56% of Ag, and 33.03% of Pb. Take by weighing 800g of the above-mentioned silver-separating slag, add it to the beaker according to the liquid-solid ratio of 6:1, then add a sodium carbonate solution with a concentration of 0.94mol / L in the beaker, stir for 4 hours at normal temperature and normal pressure, filter, and obtain the conversion liquid and 754g of conversion residue. After testing, the conversion liquid contained 0.021g / L of lead. Main components of conversion slag (by weight percentage): Au 0.0038%, Ag 0.586%, Pb 32.40%.

[0036] Under the condition of normal temperature and normal pressure, add the above 754g of conversion slag into the beaker according to the liquid-solid ratio of 6:1, and start stirring. While stirring, add nitric acid dropwise, until the pH of the solution is ≤1, stop adding nitric acid dropwise. After reacting for 3 hours, filter and wash to obtain 21...

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Abstract

The invention discloses a method for recovering lead, gold and solver from silver separation slag. Lead in the silver separation slag is separated out in a form of lead sulfate precipitate through carbonate conversion, nitric acid leaching and sulfuric acid precipitation, so that the recovery rate of lead is high, and the purity of lead sulfate is high to meet the sale purity requirement. Gold andsolver in the silver separation slag are reduced into gold and silver simple substances by zinc powder after being enriched by a gold beneficiation agent, so that the recovery rate of gold and silveris high. The method recovers lead, gold and silver from the silver separation slag to achieve high economical value; the method optimizes process parameters to reach an optimal direct yield of lead,gold and silver; and the method implements a reaction under normal-temperature and normal-pressure condition, and is simple in process operation, low in recovery cost and free of causing environmentalpollution.

Description

technical field [0001] The invention relates to the technical field of copper smelting, in particular to a method for recovering lead, gold and silver from silver slag. Background technique [0002] The conventional treatment process of copper anode slime is rotary kiln roasting-acid leaching for copper separation-chlorination for gold separation-sodium leaching silver-gold and silver refining process, and the silver slag is after the sodium nitrite leaching process in this treatment process The yield of the remaining tailings is 25-35% of the anode slime, and the composition of the silver-separating slag is complex, which contains a large amount of lead compounds and a small amount of gold and silver. In the prior art, the cyanide method can be used to directly leach gold and silver in the silver-separating slag, but because the cyanide used in this method is a highly toxic substance, the process conditions are harsh, the recovery cost is high, and because the precious meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/00C22B3/06C22B3/44C22B3/46C22B11/00C22B13/00
CPCC22B7/007C22B1/005C22B3/065C22B3/44C22B3/46C22B11/042C22B13/045Y02P10/20
Inventor 葛晓鸣石凤浜陈旭阳赵学明徐春洋
Owner 烟台国润铜业有限公司
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