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Method for recovering platinum from aluminum-based catalyst only by dissolving carrier

A technology of catalysts and waste catalysts, applied in the direction of improving process efficiency, etc., can solve the problems of high and low cost of resin and leaching agent, low metal recovery rate, etc., to save operating links, save processing costs, and simple equipment Effect

Inactive Publication Date: 2018-07-24
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

For the separation and purification of platinum group metals, the classic precipitation method still plays an important role. The disadvantages are that the process is complicated and lengthy, and the metal recovery rate is low; there are many studies and reports on the separation and purification of platinum group metals by solvent extraction and ion exchange, but industrial applications In fact, there are not many really effective and excellent extractants and ion exchange resins
Carrier and platinum fully dissolved-resin adsorption process, the leaching rate of platinum is higher, but the cost of resin and eluent is higher, and a part of platinum remaining on the resin cannot be recovered in time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for reclaiming platinum from an aluminum-based catalyst with only a dissolved carrier, comprising the following steps:

[0027] S1: Dissolve the platinum-containing waste catalyst as a carrier. The reagent used is concentrated sulfuric acid. The amount of concentrated sulfuric acid is 2 to 8 times that of the platinum-containing waste catalyst, and the amount of water added is 3 to 10 times the weight of the platinum-containing waste catalyst raw material. The temperature is 80~120℃, and the reaction time is 2~8h;

[0028] S2: adding a reducing agent or a precipitating agent to reduce or precipitate a small amount of platinum dissolved in the solution;

[0029] S3: Carry out clarification and liquid-solid separation, dilute the solution in S2 with water, and the diluted volume reaches 30 to 80 times that of the platinum-containing waste catalyst raw material. Filter to obtain platinum-containing slag;

[0030] S4: Calcining platinum-containing slag to remove ...

Embodiment 2

[0037] Pt-Al containing Pt0.28% 2 o 3 1000g of spent catalyst, in a 10-liter glass reactor, add 3 liters of water, 2 liters of concentrated sulfuric acid, the temperature is 100 degrees, add 3 liters of water after 4 hours of reaction, add 10ml of hydrazine hydrate, and discharge it into a 40-liter plastic bucket after 2 hours of reaction , and dilute with water to a total volume of 40 liters, let stand for 24 hours and then discharge the supernatant, filter the thick slurry at the bottom and roast at 700 ° C for 6 hours. Add 50ml of water, 100ml of hydrochloric acid, and 5g of sodium chlorate to the burnt slag to dissolve platinum at a temperature of 90°C and filter. Add 20g of ammonium chloride to the leaching solution, place it until the next day to filter, and wash the ammonium chloroplatinate precipitate with 50g / L of ammonium chloride solution. Ammonium chloroplatinate was slurried with pure water, heated to 80°C, and reduced by adding hydrazine hydrate to obtain 2.8 g...

Embodiment 3

[0040] Pt-Al containing Pt0.28% 2 o 32000g of spent catalyst, in a 20-liter glass reactor, add 7 liters of water, 4.5 liters of concentrated sulfuric acid, the temperature is 100 degrees, add 7 liters of water after 4 hours of reaction, add 10g of sodium sulfide, and discharge it into a 100-liter plastic bucket after 2 hours of reaction , and add water to dilute to a total volume of 100 liters, let stand for 24 hours and discharge the supernatant, filter the thick slurry at the bottom and roast at 700°C for 6 hours. Add 100ml of water, 300ml of hydrochloric acid, and 60ml of nitric acid to the burnt slag to dissolve platinum at a temperature of 90°C. After 4 hours of reaction, filter, add 50g of ammonium chloride to the leaching solution, leave it to filter the next day, and use 50g / L of chlorine ammonium chloride solution to wash the ammonium chloroplatinate precipitate. Ammonium chloroplatinate was calcined at 700°C for 6h to obtain 5.49g of platinum sponge.

[0041] Add ...

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PUM

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Abstract

The invention relates to a method for recovering platinum from an aluminum-based platinum catalyst. The mode that an aluminum-based carrier is selectively dissolved, and the platinum is recycled froma small amount of insoluble residues through re-dissolving is adopted. The process route comprises the following steps of selective dissolving of the aluminum-based carrier, reduction precipitation, clarifying filtration, calcination for removing organic matters, oxidation dissolution of the platinum through inorganic acid, precipitation and reduction of the platinum, and sponge platinum products.According to the method, catalyst raw materials are not roasted, the small amount of remaining insoluble residues after the carrier is dissolved are only roasted, and energy consumption is greatly reduced. The process is simple and short, reagent consumption is less, and the recovery cost is low. Platinum recovery cannot be delayed, and the recovery timeliness is good. The platinum recovery ratereaches 98.2%, and the sponge platinum purity is greater than or equal to 99.95%.

Description

technical field [0001] The invention belongs to the field of recovery and reuse, and in particular relates to a method for recovering platinum from an aluminum-based catalyst with only a dissolved carrier. Background technique [0002] Platinum group metals are scarce resources. The content in the earth's crust is only 0.001-0.01g / t (Pt is 0.005g / t). and its important uses. Platinum group metals have excellent catalytic properties. In the chemical industry, especially in the petrochemical industry, petroleum refining industry, pharmaceutical and energy industries, 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. In addition, it also has very important uses in the fields of electronics, glass ceramics an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B7/00
CPCC22B11/048Y02P10/20
Inventor 杨志平
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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