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Method for recovering platinum and aluminum from aluminum-based platinum catalyst

A waste catalyst, aluminum-based technology, applied in the direction of improving process efficiency, can solve the problems of high recovery rate, low metal recovery rate, unstable operation effect, etc., and achieve the effect of high leaching rate

Pending Publication Date: 2022-02-18
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The process of recovering platinum from spent catalysts is dominated by wet methods, and the classic precipitation method still occupies a certain position. Its disadvantages are that the process is complicated and lengthy, and the metal recovery rate is low; the solvent extraction process is not stable enough, and the product quality is also low. Unstable, high cost, poor operating environment, organic solvents are partially dissolved in the water phase, resulting in serious excess of organic matter in wastewater; the ion exchange process runs stably, with high platinum recovery and good product quality
[0004] At present, there are many processes for recovering platinum by ion exchange. Generally, the alumina carrier is used as a platinum catalyst, and the alumina carrier and platinum are completely dissolved, and then the platinum in the leachate is recovered by resin adsorption, and the aluminum in the tail solution is not effectively recovered. , when lime neutralizes waste water, aluminum enters the neutralized slag in the form of aluminum hydroxide and causes waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] 6. Preparation of platinum sponge: Precipitate platinum with ammonium chloride to obtain ammonium chloroplatinate, and wash and calcinate the ammonium chloroplatinate to obtain platinum sponge. The calcination temperature is 600-900° C., and the calcination time is 4-8 hours.

[0029] 7. Aluminum recovery: add ammonia water to the adsorption tail liquid, adjust the pH value to 7, and the temperature is 60 ℃ ~ 90 ℃, filter to remove the iron precipitate, then add ammonium sulfate 0.4 times the amount of spent catalyst raw materials, and cool the temperature to 10 ℃ At ~20°C, ammonium aluminum sulfate precipitates out, and is filtered to obtain ammonium aluminum sulfate and the precipitated mother liquor.

[0030] 8. The aluminum precipitation mother liquor is returned for utilization: 75% of the aluminum ammonium sulfate precipitation mother liquor is returned to dissolve the spent catalyst carrier, and 25% of the precipitated mother liquor is used to dilute the spent ca...

Embodiment

[0037] According to the operating steps and related parameters disclosed in the present invention, those skilled in the art can realize the object of the present invention according to the operating principle of the method, and are not limited to the equipment itself and its usage mode used in the specific implementation.

[0038]The present invention will be described in detail below in conjunction with examples.

Embodiment 1

[0040] Roasting and leaching: Pt-Al containing Pt0.28% 2 o 3 Spent catalyst 1000g, roasted at 700°C for 4 hours, in a 10-liter glass reactor, add 3 liters of water, 2 liters of concentrated sulfuric acid, temperature 100°C, after 4 hours of reaction, the carrier Al 2 o 3 Dissolve, add 1 liter of water, add 100ml of hydrochloric acid, 100g of sodium chloride, and 40g of sodium chlorate to form a 1000ml solution, add slowly, stir and react at 90°C to 100°C for 2h, and the dissolution reaction ends. Transfer the ore slurry into a 20-liter plastic bucket, add water to dilute to a total volume of 17.5L, and after clarification for 24 hours, suck out the clear liquid, filter and wash the thick slurry at the bottom, and combine them together to obtain 18L of leachate with a Pt concentration of 154.8mg / L, Pt leaching rate is 99.5%.

[0041] Adsorption and rinsing: The leachate passes through the exchange column equipped with 50ml piperidine chelating resin at a flow rate of 60ml / h...

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PUM

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Abstract

The invention belongs to the technical field of platinum and aluminum recovery, and particularly relates to a method for recovering platinum and aluminum from an aluminum-based platinum catalyst. The method comprises the following steps: roasting decarburization, carrier complete dissolution, dilution and clarification, resin adsorption and leaching recovery of platinum, and recovery of aluminum from adsorption tail liquid. The method provided by the invention is short in process and low in recovery cost, aluminum is recovered in the adsorption tail liquid in the form of aluminum ammonium sulfate, the metal yield is high, the recovery rate of platinum is greater than 99.5%, the total recovery rate of aluminum is greater than 95%, and the purity of sponge platinum is greater than or equal to 99.95%.

Description

technical field [0001] The invention belongs to the technical field of recycling platinum and aluminum, and in particular relates to a method for recycling platinum and aluminum from an aluminum-based platinum catalyst. Background technique [0002] Platinum group metals are scarce resources, and their content in the earth's crust is only 0.001-0.01g / t (Pt is 0.005g / t). They are expensive and have important industrial uses in addition to high economic value. Platinum group metals have excellent catalytic properties. In the chemical industry, especially in petrochemical industry, petroleum refining industry, medicine and energy industry, catalysts containing platinum group metals such as platinum and palladium are widely used. As far as platinum is concerned, it is widely used in the fields of petrochemical industry (reforming and catalytic cracking), fertilizer industry (catalyst for synthesis of ammonia) and elimination of automobile exhaust pollution. There is a shortage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/24C22B1/02C22B11/02C22B21/00C22B11/00
CPCC22B7/001C22B1/02C22B7/007C22B21/0076C22B21/003C22B11/048C22B11/026C22B3/24Y02P10/20
Inventor 杨志平
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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