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Method for efficiently concentrating precious metal from difficultly-treated palladium-containing waste catalyst

A technology for waste catalysts and precious metals, applied in the field of high-efficiency enrichment of precious metals, can solve the problems of difficulty in melting, high melting point of slag, and high energy consumption, and achieve the effects of low cost, low content of valuable metals in slag, and high direct metal yield.

Inactive Publication Date: 2020-01-24
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using pyrometallurgical enrichment smelting, the melting point of the general slag-type slag is very high, melting is difficult, and energy consumption is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Composition of pressure slag of copper mud (unit: %, Au, Pd, Pt g / t) Ag13.79, Au2710, Pd236, Pt139, Ni3.60, Cu0.89, Pb21.84, Bi3.12, Se3.78, Te1.93.

[0032] A. Weigh the ground waste catalyst containing palladium, pressure slag of copper mud, reducing agent and flux, and mix them evenly, and put them into a clay crucible with a graphite crucible. The amount of waste catalyst containing palladium is copper mud 7-21% of the mass of pressurized slag, the amount of reducing agent coke powder added is 3-5% of the mass of copper sludge pressurized slag, and the amount of flux sodium carbonate added is 7-21% of the mass of copper sludge pressurized slag;

[0033] B. Heat the crucible with ingredients to 1250-1350℃ and keep it for 45-60min;

[0034] C. After all the smelted samples are released from the furnace, cool rapidly or naturally to room temperature, pour out the solidified slag and precious lead alloy or carefully smash the crucible and carefully separate the slag and preci...

Embodiment 2

[0037] A. Weigh the ground waste catalyst containing palladium, pressure slag of copper mud, reducing agent and flux, and mix them evenly, and put them into a clay crucible with a graphite crucible. The amount of waste catalyst containing palladium is copper mud 7-21% of the mass of pressurized slag, the amount of reducing agent coke powder added is 3-5% of the mass of copper sludge pressurized slag, and the amount of flux sodium carbonate added is 7-21% of the mass of copper sludge pressurized slag;

[0038] B. Heat the crucible with ingredients to 1250-1350℃ and keep it for 45-60min;

[0039] C. After all the smelted samples are released from the furnace, cool rapidly or naturally to room temperature, pour out the solidified slag and precious lead alloy or carefully smash the crucible and carefully separate the slag and precious lead alloy, and accurately weigh their mass on an electronic scale. Grind them on a vibrating mill and sample and analyze their base metal or oxide conte...

Embodiment 3

[0042] A. Weigh the ground waste catalyst containing palladium, pressure slag of copper mud, reducing agent and flux, and mix them evenly, and put them into a clay crucible with a graphite crucible. The amount of waste catalyst containing palladium is copper mud 7-21% of the mass of pressurized slag, the amount of reducing agent coke powder added is 3-5% of the mass of copper sludge pressurized slag, and the amount of flux sodium carbonate added is 7-21% of the mass of copper sludge pressurized slag;

[0043] B. Heat the crucible with ingredients to 1250-1350℃ and keep it for 45-60min;

[0044] C. After all the smelted samples are released from the furnace, cool rapidly or naturally to room temperature, pour out the solidified slag and precious lead alloy or carefully smash the crucible and carefully separate the slag and precious lead alloy, and accurately weigh their mass on an electronic scale. Grind them on a vibrating mill and sample and analyze their base metal or oxide conte...

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Abstract

The invention discloses a method for efficiently concentrating precious metal from a difficultly-treated palladium-containing waste catalyst. The method includes the steps that the palladium-containing waste catalyst, copper mud pressurizing slag, a reducing agent and a fluxing agent are heated and subjected to heat insulation; slag and a precious lead alloy are subjected to cooling separation, grinding is conduced, and sampling analysis of the content is conducted; vacuum melting distillation separation is conducted on the precious lead alloy, a vacuum furnace rare and precious alloy and a lead bismuth alloy are obtained, and the precious metal is separated from lead and bismuth. By means of the method, a melting low-temperature alkaline concentration smelting method is used for treatingthe high silicon and aluminum carrier type high and low grade palladium-containing waste catalyst and the copper anode mud pressurizing slag, gradient comprehensive utilization of gold, silver and platinum family precious metal, lead, bismuth and dissipated, rare and precious metal elements is achieved, the process is the shortest, the cost is the lowest, and efficiency is the highest. The palladium-containing waste catalyst rate can be large and can be small, the treatment capability is flexible, concentration smelting treatment is achieved, and concentration smelting of the palladium familyprecious metal is not affected; and a melting low-temperature alkaline smelting technology is adopted, the smelting temperature is far lower than that of matte smelting, energy consumption is greatlyreduced, and therefore the machining cost of the difficultly-treated waste catalyst is reduced.

Description

Technical field [0001] The invention belongs to the technical field of rare and precious metal pyrometallurgy and vacuum metallurgy, and specifically relates to a method for efficiently enriching precious metals from difficult-to-treat waste catalysts containing palladium. Background technique [0002] Due to the high grade of secondary resources of platinum group metals, the carrier is usually cordierite or alumina carrier. When the total wet process is used directly, the platinum group metal in the leaching residue is still high, and it is necessary to repeatedly wet the leaching residue. The treatment process is long, so the primary direct yield of platinum group metals is not high, resulting in large reagent consumption, and a large amount of high hydrochloric acid wastewater. In addition, due to the dissolution of a large amount of silicon and aluminum, liquid-solid separation is difficult, and processing Problems of high cost and environmental pollution. [0003] Palladium-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/02C22B5/10C22B13/02C22B30/06C22B7/00
CPCC22B5/10C22B7/001C22B11/026C22B13/025C22B30/06Y02P10/20
Inventor 钟清慎贺秀珍李芬霞赵彦才
Owner JINCHUAN GROUP LIMITED
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