Method for recycling silver and gold from silver and gold containing anode sludge

Abstract

The invention discloses a method for recycling silver and gold from silver and gold containing anode sludge. The method comprises the following steps: grinding the anode sludge with absolute ethyl alcohol, and performing drying to obtain powder; pouring the obtained powder into aqua regia, and performing stirring and dissolution; performing filtering to obtain filtrate and solid slag; adding the filtrate into an adsorption column loaded with functionalized Zr-MOF materials and performing multi-staged circular cyclic adsorption treatment; eluting the functionalized Zr-MOF materials by using an eluting agent, washing and drying the eluted functionalized Zr-MOF materials by using deionized water and re-utilizing the functionalized Zr-MOF materials, adding eluent into a reactor, adding sodium sulfite and performing stirring reducing treatment, performing filtering, and drying the filtered solid to prepare golden powder; and adding hydrazine hydrate into the solid slag, performing heat stirring reducing reaction, then performing cooling until the temperature is up to a room temperature, performing filtration, and washing and then drying the filtered solid to prepare silver powder. The method is easy to operate, mild in conditions and low in cost; and the adsorption materials adopted by the method is high in adsorption performance and high in reuse ratios.

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, perform ultrasonic treatment, 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 multi-stage cyclic adsorption treatment is carried out...

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, perform ultrasonic treatment, 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 multi-stage cyclic adsorption treatment is carried out...

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...

Images