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Method for recycling noble metal from iron alloy

A technology for ferroalloys and precious metals, applied in the field of acid dissolution activation of ferroalloys containing precious metals, can solve the problems of large equipment investment, strict process operation, high operational risks, etc., and achieves the effects of low maintenance cost of equipment, improved acid dissolution rate, and easy use.

Inactive Publication Date: 2018-11-02
上海御盾新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a process for dissolving and activating ferroalloys containing precious metals with acid, which can solve the problems in the prior art of dissolving and activating precious metals from such ferroalloys with large equipment investment, strict process operations, and high operational risks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 1.2kg of ferroalloy and place it in a high-temperature furnace, heat it to 1500℃, and control the vacuum degree of the flue gas in the high-temperature furnace to 50pa. The ferroalloy will melt at high temperature to form molten iron. Adjust and maintain the temperature of the molten iron at 1200℃~1500 ℃, 0.36kg of ferric oxide is added to the molten iron. During the addition, the residue generated by the reaction is continuously separated from the molten iron. After the ferric oxide is completely added, the molten iron is heated to 1500°C, and the activated molten iron is poured out And cool to room temperature, add 14.5L, 3mol / L hydrochloric acid solution, dissolve and remove the filtrate to obtain the precious metal enriched material, put the precious metal enriched material in aqua regia, take the filtrate to obtain the precious metal solution, the filter residue obtained after filtration returns to high temperature Furnace treatment for secondary recovery. The...

Embodiment 2

[0017] Weigh 2.5kg of ferroalloy and place it in a high-temperature furnace, heat it to 1700℃, and control the vacuum of the flue gas in the high-temperature furnace to 100pa. The ferroalloy will melt at high temperature to form molten iron. Adjust and maintain the temperature of the molten iron at 1400℃. 15kg of ferroferric oxide is added to the molten iron. During the addition, the residue generated by the reaction is continuously separated from the molten iron. After the ferroferric oxide is completely added, the molten iron is heated to 1500°C, and the activated molten iron is poured out and cooled to room temperature , Add 36L, 2.5mol / L sulfuric acid solution, dissolve and remove the filtrate to obtain the precious metal enriched material, place the precious metal enriched material in aqua regia, take the filtrate to obtain the precious metal solution, and return the filtered residue to the high-temperature furnace for treatment. Recycling. The disposable acid dissolution ...

Embodiment 3

[0019] Weigh 2.2 kg of ferroalloy and place it in a high-temperature furnace, heat it to 1600℃, and control the vacuum of the flue gas in the high-temperature furnace to 50pa. The ferroalloy will melt at high temperature to form molten iron. Adjust and maintain the temperature of the molten iron at 1400℃. Add 0.95kg of ferric oxide to the molten iron. During the addition, the residue produced by the reaction is continuously separated from the molten iron. After the ferric oxide is completely added, the molten iron is heated to 1500°C, and the activated molten iron is poured out and cooled to At room temperature, add 19.5L, 4mol / L sulfuric acid solution, dissolve and remove the filtrate to obtain the precious metal enrichment. Put the precious metal enrichment in aqua regia, take the filtrate to obtain the precious metal solution, and return the filter residue obtained after filtration to the high-temperature furnace for processing Secondary recovery. The disposable acid dissolu...

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Abstract

The invention discloses a technology method for noble metal containing iron alloy acid dissolution and activation. The technology method comprises the following steps that firstly, the iron alloy is melted into molten iron, and the temperature of the molten iron ranges from 1,200 DEG C to 1,500 DEG C; secondly, oxide is added in the molten iron in the first step, generated reactant residues are constantly separated from the molten iron, and after the reaction is complete, the molten iron is poured out after the temperature of the molten iron is increased to 1,500 DEG C, and cooling is conducted to the room temperature; thirdly, an acid solution is added in a product of the second step, and after dissolving, the liquid part is filtered out, and a noble metal enriched product is obtained; and fourthly, the noble metal enriched product obtained in the third step is dissolved in aqua regia, filter residues are filtered out, and a noble metal solution is obtained. According to the technology method for noble metal containing iron alloy acid dissolution and activation, the one-time acid dissolution rate of the noble metal is higher than 95%, the total recycling rate of the noble metal can reach 99.9% or above, localization of all technology equipment used in the recycling process can be achieved, and the one-time investment is reduced.

Description

Technical field [0001] The invention relates to the field of precious metal recovery, in particular to a process method for acid dissolution and activation of precious metal-containing ferroalloys. Background technique [0002] Noble metals mainly refer to gold, silver and platinum group metals. Platinum group metals include ruthenium, rhodium, palladium, osmium, iridium, and platinum. Most of these metals have beautiful colors and are highly resistant to chemicals. They are not easy under normal conditions. Causes a chemical reaction, so it has a higher value. [0003] The precious metals mainly contained in this type of ferroalloys are platinum, palladium, and rhodium. According to the prior art, the process method of dissolving and activating precious metals from ferroalloys is to melt the ferroalloys to form molten iron at a high temperature, and then add them to the molten iron in a relatively closed high-temperature furnace. High-pressure oxygen is continuously blown in for...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C21C7/04
CPCC21C7/04C22B7/00C22B11/00Y02P10/20
Inventor 刘炳安
Owner 上海御盾新材料科技有限公司
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