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Method for promoting efficient enrichment of precious metals in anode mud by tartaric acid

A technology of anode slime and tartaric acid, applied in the field of comprehensive recovery of solid waste resources, can solve problems such as difficult to remove efficiently and inactive properties

Pending Publication Date: 2022-04-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, due to the high content of Cu and Sb in anode slime and their inactive nature, it is difficult to remove them efficiently
Moreover, it is still challenging to efficiently remove impurities while avoiding the loss of precious metals and achieve efficient enrichment of precious metals.

Method used

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  • Method for promoting efficient enrichment of precious metals in anode mud by tartaric acid
  • Method for promoting efficient enrichment of precious metals in anode mud by tartaric acid
  • Method for promoting efficient enrichment of precious metals in anode mud by tartaric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Alkali roasting, water immersion

[0033] (1) Dry the anode slime and grind it into a powder with a particle size of less than 200 mesh, mix it with NaOH and roast, control the mass ratio of NaOH to mud at 1:1, roast at 700°C, and roast for 2.0 hours to obtain roasted mud .

[0034] (2) Perform stirring and leaching reaction on the mud obtained by roasting in step (1) with water, control the liquid-solid ratio to 25 / 1, the temperature at 90° C., and the rotational speed at 300 rpm, and react for 1.5 hours. After the reaction, the solid-liquid separation was carried out to obtain the water soaked residue, which was washed and dried at 75°C for 12 hours for storage.

[0035] Roasting realizes the transformation of the phase of the anode slime towards the direction where impurities are easier to remove and precious metals are easier to retain. Compared with the control with anode slime as the leaching object, the leaching rate of impurities Cu, Ni and Sb in the sample ro...

Embodiment 2

[0038] Tartaric Auxiliary H 2 SO 4 -H 2 o 2 Efficiently leaching impurities Cu and Sb, and retaining precious metals Ag, Au and Pd.

[0039] Add 10.00 g of tartaric acid into an Erlenmeyer flask filled with 200 mL of 2.0 mol / L sulfuric acid, place in an oil bath and stir at a speed of 300 rpm to raise the temperature to 70°C. After the temperature stabilized, add 5.00g of dried mud after alkali roasting-water immersion, and then slowly inject it along the bottle wall (H 2 o 2 Directly add 10mL of 30% H 2 o 2 ,start the timer. Added 2.0g NaCl without adding tartaric acid as the control group. After the reaction was carried out for 40 minutes, solid-liquid separation was carried out to obtain precious metal-enriched slag, which was centrifuged, washed, and dried at 75° C. for 12 hours. Take out about 1mL leachate filter membrane with a syringe, dilute with 2% (v / v) nitric acid and measure the content of impurities (Cu, Ni and Sb) and precious metals (Ag, Au and Pd) by A...

Embodiment 3

[0042] The concentration of tartaric acid in the leaching system is optimized to efficiently remove impurities and enrich precious metals at the same time.

[0043] A certain amount of tartaric acid was added into an Erlenmeyer flask filled with 200 mL of 2.0 mol / L sulfuric acid, placed in an oil bath and stirred at a speed of 300 rpm to raise the temperature to 70°C. After the temperature is stable, add 5.00g of dried mud after alkali roasting-water immersion, and then slowly inject 10mL of 30% H2O along the bottle wall. 2 o 2 ,start the timer. The control tartaric acid concentration is 0.17, 0.27, 0.33, 0.40, 0.50mol / L (due to the added H 2 o 2 Less, when calculating the concentration of tartaric acid, ignore H 2 o 2 volume). After the reaction was carried out for 40 min, about 1 mL of the leaching solution was taken out with a syringe to filter the membrane, and after being diluted with 2% (v / v) nitric acid, the impurities (Cu, Ni, and Sb) and precious metals (Ag, Au,...

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Abstract

The invention belongs to the technical field of comprehensive recovery of solid waste resources, and particularly relates to a method for promoting efficient enrichment of precious metals in anode slime by tartaric acid, which comprises the following steps: (1) drying the anode slime, grinding into powder, mixing with NaOH, and roasting to obtain roasted slime; and carrying out water leaching to obtain water leaching residues, carrying out a leaching reaction on sludge obtained after drying the water leaching residues by using a mixed system of tartaric acid and H2SO4-H2O2, and carrying out solid-liquid separation after the reaction is finished to obtain precious metal enriched residues. The method has the following advantages that the removal rates of the main impurities Cu and Sb are obviously increased and reach 99.7% and 99.9% respectively; the loss of noble metals Au, Ag and Pd is only 0.5%, 0.02% and 9.0%; the precious metal is efficiently enriched, and Ag, Au and Pd are enriched by 517.08%, 330.77% and 400.00% respectively. The method uses dilute acid and a cleaning reagent, and meets environmental protection requirements.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery of solid waste resources, and in particular relates to a method for promoting the high-efficiency enrichment of precious metals in anode slime with tartaric acid. Background technique [0002] The anode slime produced in the copper electrolytic refining process is an important secondary resource for the recovery of precious and valuable metals. At the same time, the recovery of high-value precious metals has gradually become the main driving force for the development of the anode slime recycling industry. However, impurities such as Cu, Ni, Sb, Sn, Pb and As in anode slime account for more than 70% of the total. On the one hand, the recovery of precious metals directly extracted from mud is low due to the effects of impurities such as adhesion, encapsulation, and chemical synthesis. On the other hand, efficient removal of impurities and enrichment of precious metals is of great si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/00C22B11/00
CPCC22B1/02C22B7/007C22B11/042Y02P10/20
Inventor 朱能武朱文冼金婵李飞
Owner SOUTH CHINA UNIV OF TECH
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