Method for recovering silver and gold from anode slime containing silver and gold

Abstract

The invention discloses a method for recovering silver and gold from anode slime containing silver and gold, which comprises the following steps: after grinding the anode slime with absolute ethanol, drying, putting the obtained powder into aqua regia, stirring and dissolving; filtering , to obtain the filtrate and solid residue; the filtrate is added to the adsorption column loaded with functionalized Zr-MOF material, and multi-stage cycle adsorption treatment is carried out; the functionalized Zr-MOF material is eluted with an eluent, and after elution The functionalized Zr-MOF material is washed with deionized water, dried and reused. The eluent is added to the reactor, and sodium sulfite is added, stirred and reduced, filtered, and the filtered solid is dried to obtain gold powder; Add hydrazine hydrate inside, heat and stir for reduction reaction, then cool to room temperature, filter, and the solid obtained by filtering is washed and dried to obtain silver powder. The method has simple operation, mild conditions and low cost; the adsorption material adopted in the invention has good adsorption performance and high recycling rate.

Description

Technical field:

[0001] The invention relates to the field of metal recovery, in particular to a method for recovering silver and gold from anode slime containing silver and gold Background technique:

[0002] In the electrolytic refining or electrolytic extraction of soluble anodes, in addition to the main metal, the anode also contains a small or trace amount of other metals or elements, which exist in the anode in the form of simple substances, alloys or compounds. When the anode is polarized, these metals or elements become anode slime due to the following reasons: (1) its equilibrium potential is positive to the anode potential, so it cannot be ionized into the electrolyte; (2) although it can be ionized into the In the electrolyte, but immediately form an insoluble salt with the electrolyte and precipitate from the electrolyte; (3) Partial oxidation forms an insoluble compound or elemental element. The generated anode slime exists in the form of dispersed fine-grained...

Examples

Embodiment 1

[0026] (1) After grinding the anode slime with absolute ethanol, dry it, and slowly add the obtained powder into aqua regia, the mass ratio of aqua regia to anode slime is 1:2, stir and dissolve at 35°C and 1000rpm for 1 hour; finally carry out Filter to obtain filtrate and solid residue;

[0027] (2) Add 0.5g of zirconium chloride and 0.5g of 2-aminoterephthalic acid into 100ml of DMF and stir until the solid dissolves, then add 2ml of acetic acid, ultrasonically treat, and finally heat and stir in an oil bath at 100°C and 1000rpm for reaction After 3h, cool to room temperature after the reaction, and filter the reaction solution, wash and dry the obtained solid to obtain an amino-modified Zr-MOF material with an average particle size of 50±5nm and a specific surface area of ​​1045.5m 2 / g;

[0028] (3) The filtrate obtained above is added to an adsorption column loaded with an amino-modified Zr-MOF material, and a multi-stage cycle adsorption treatment is carried out until ...

Embodiment 2

[0032] (1) After grinding the anode slime with absolute ethanol, dry it, and slowly add the obtained powder into aqua regia, the mass ratio of aqua regia to anode slime is 1:4, stir and dissolve at 55°C and 1500rpm for 3 hours; finally carry out Filter to obtain filtrate and solid residue;

[0033] (2) Add 1g of zirconium chloride and 0.8g of 2-aminoterephthalic acid into 100ml of DMF and stir until the solid dissolves, then add 5ml of acetic acid, perform ultrasonic treatment, and finally heat and stir in an oil bath at 100°C and 1500rpm to react 3 -7h, cool to room temperature after the reaction, and filter the reaction solution, wash and dry the obtained solid to obtain an amino-modified Zr-MOF material; the average particle size is 50±5nm, and the specific surface area is 1046.3m 2 / g;

[0034] (3) The filtrate obtained above is added to an adsorption column loaded with an amino-modified Zr-MOF material, and multi-stage cyclic adsorption treatment is carried out until no ...

Embodiment 3

[0038] (1) After grinding the anode slime with absolute ethanol, dry it, and slowly add the obtained powder into aqua regia, the mass ratio of aqua regia to anode slime is 1:3, stir and dissolve at 40°C and 1200pm for 2 hours; finally carry out Filter to obtain filtrate and solid residue;

[0039] (2) Add 0.8g of zirconium chloride and 0.6g of 2-aminoterephthalic acid into 100ml of DMF and stir until the solid dissolves, then add 3ml of acetic acid, ultrasonically treat, and finally heat and stir in an oil bath at 100°C and 1500pm for reaction After 5h, cool to room temperature after the reaction, and filter the reaction solution, wash and dry the obtained solid to obtain an amino-modified Zr-MOF material; the average particle size is 50±5nm, and the specific surface area is 1045.8m 2 / g;

[0040] (3) The filtrate obtained above is added to an adsorption column loaded with an amino-modified Zr-MOF material, and multi-stage cyclic adsorption treatment is carried out until no g...

Technical field:

[0001] The invention relates to the field of metal recovery, in particular to a method for recovering silver and gold from anode slime containing silver and gold Background technique:

[0002] In the electrolytic refining or electrolytic extraction of soluble anodes, in addition to the main metal, the anode also contains a small or trace amount of other metals or elements, which exist in the anode in the form of simple substances, alloys or compounds. When the anode is polarized, these metals or elements become anode slime due to the following reasons: (1) its equilibrium potential is positive to the anode potential, so it cannot be ionized into the electrolyte; (2) although it can be ionized into the In the electrolyte, but immediately form an insoluble salt with the electrolyte and precipitate from the electrolyte; (3) Partial oxidation forms an insoluble compound or elemental element. The generated anode slime exists in the form of dispersed fine-grained...

Examples

Embodiment 1

[0026] (1) After grinding the anode slime with absolute ethanol, dry it, and slowly add the obtained powder into aqua regia, the mass ratio of aqua regia to anode slime is 1:2, stir and dissolve at 35°C and 1000rpm for 1 hour; finally carry out Filter to obtain filtrate and solid residue;

[0027] (2) Add 0.5g of zirconium chloride and 0.5g of 2-aminoterephthalic acid into 100ml of DMF and stir until the solid dissolves, then add 2ml of acetic acid, ultrasonically treat, and finally heat and stir in an oil bath at 100°C and 1000rpm for reaction After 3h, cool to room temperature after the reaction, and filter the reaction solution, wash and dry the obtained solid to obtain an amino-modified Zr-MOF material with an average particle size of 50±5nm and a specific surface area of ​​1045.5m 2 / g;

[0028] (3) The filtrate obtained above is added to an adsorption column loaded with an amino-modified Zr-MOF material, and a multi-stage cycle adsorption treatment is carried out until ...

Embodiment 2

[0032] (1) After grinding the anode slime with absolute ethanol, dry it, and slowly add the obtained powder into aqua regia, the mass ratio of aqua regia to anode slime is 1:4, stir and dissolve at 55°C and 1500rpm for 3 hours; finally carry out Filter to obtain filtrate and solid residue;

[0033] (2) Add 1g of zirconium chloride and 0.8g of 2-aminoterephthalic acid into 100ml of DMF and stir until the solid dissolves, then add 5ml of acetic acid, perform ultrasonic treatment, and finally heat and stir in an oil bath at 100°C and 1500rpm to react 3 -7h, cool to room temperature after the reaction, and filter the reaction solution, wash and dry the obtained solid to obtain an amino-modified Zr-MOF material; the average particle size is 50±5nm, and the specific surface area is 1046.3m 2 / g;

[0034] (3) The filtrate obtained above is added to an adsorption column loaded with an amino-modified Zr-MOF material, and multi-stage cyclic adsorption treatment is carried out until no ...

Embodiment 3

[0038] (1) After grinding the anode slime with absolute ethanol, dry it, and slowly add the obtained powder into aqua regia, the mass ratio of aqua regia to anode slime is 1:3, stir and dissolve at 40°C and 1200pm for 2 hours; finally carry out Filter to obtain filtrate and solid residue;

[0039] (2) Add 0.8g of zirconium chloride and 0.6g of 2-aminoterephthalic acid into 100ml of DMF and stir until the solid dissolves, then add 3ml of acetic acid, ultrasonically treat, and finally heat and stir in an oil bath at 100°C and 1500pm for reaction After 5h, cool to room temperature after the reaction, and filter the reaction solution, wash and dry the obtained solid to obtain an amino-modified Zr-MOF material; the average particle size is 50±5nm, and the specific surface area is 1045.8m 2 / g;

[0040] (3) The filtrate obtained above is added to an adsorption column loaded with an amino-modified Zr-MOF material, and multi-stage cyclic adsorption treatment is carried out until no g...

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