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Method for concentrating platinum group metals from alumina-based waste catalyst

A technology of platinum group metals and catalysts, which is applied in the field of enriching platinum group metals, can solve the problems of high energy consumption for carrier fusion, low dissolution efficiency, and high production cost, and achieve low equipment corrosion, good enrichment effect, and small equipment corrosion Effect

Active Publication Date: 2013-07-10
GUIYAN RESOURCE YIMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Alkaline solution can dissolve Al in spent catalyst under atmospheric pressure 2 o 3 Carrier, but the dissolution efficiency is low, the dissolution rate is only 50-70%, and the alkali consumption is large, and the production cost is high; high temperature alkali melting Al 2 o 3 Carrier fusion energy consumption is high, equipment corrosion is serious

Method used

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  • Method for concentrating platinum group metals from alumina-based waste catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] like figure 1 As shown, a method for enriching platinum group metals from alumina-based spent catalysts comprises the following steps:

[0031] A. Primary incineration: incinerate the platinum-containing alumina-based waste catalyst at 600°C until the carbon content of the catalyst is less than 1%;

[0032] B, pulverization: the spent catalyst ball milling after step A gained charcoal is to 70 orders;

[0033] C. Pressurized alkali dissolution: 500g of the pulverized alumina-based waste catalyst obtained in step B, the platinum content is 2059g / T, 1000g of 28% NaOH solution is added, and 2.5g of hydrazine hydrate is added, and put into a stainless steel autoclave In the process, the temperature was raised to 140°C within 2 hours, the pressure was 0.3MPa, and after 2.5 hours of constant temperature and pressure, the temperature was raised to 190°C in 1.5 hours, the pressure was 1.2MPa, and the constant temperature was 2 hours;

[0034] D. Filtration: Filter the soluti...

Embodiment 2

[0037] A method for enriching platinum group metals from alumina-based spent catalysts, comprising the steps of:

[0038] A. Primary incineration: Incinerate the platinum-containing alumina-based waste catalyst at 620°C until the carbon content of the catalyst is less than 1%;

[0039] B, pulverization: the spent catalyst ball milling after step A gained charcoal is to 75 orders;

[0040] C, pressurized alkali dissolution: 500g of the crushed alumina-based waste catalyst obtained in step B, the platinum content is 2172g / T, add 1000g of 30% NaOH solution, add 3g of sodium formate, put it into a stainless steel autoclave, and Heating to 135°C within 2 hours, pressure 0.3MPa, constant temperature and pressure for 2.5 hours, heating to 190°C in 1 hour, pressure 1.3MPa, constant temperature for 2.5 hours;

[0041] D. Filtration: Filter the solution obtained in step C at 130°C, wash 10.85g of the filter residue with 65.1g of 80°C hot water each time, wash 3 to 4 times, check with h...

Embodiment 3

[0044] A method for enriching platinum group metals from alumina-based spent catalysts, comprising the steps of:

[0045] A. Primary incineration: Incinerate the palladium-containing alumina-based waste catalyst at 650°C until the carbon content of the catalyst is less than 1%;

[0046] B, pulverization: the waste catalyst ball milling to 80 orders after the charcoal burning of gained in step A;

[0047] C, pressurized alkali dissolution: 500g of alumina-based waste catalysts pulverized by step B gained, palladium content is 2979g / T, add 30% NaOH solution 1250g, add 4g sodium formate again, put into stainless steel autoclave, in Heating to 130°C within 2 hours, pressure 0.4MPa, constant temperature and pressure for 2 hours, heating to 195°C in 1 hour, pressure 1.4MPa, constant temperature for 3 hours;

[0048] D. Filtration: Filter the solution obtained in step C at 135°C, wash 10.9g of filter residue with 87.2g of 85°C hot water each time, wash 3 to 4 times, check with hydro...

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Abstract

The invention relates to the field of extraction of platinum group metals, particularly relates to a method for concentrating platinum group metals from an alumina-based waste catalyst, and the method overcomes the defects of the prior art. The method is suitable for a wide range of materials; and based on the method, the carrier dissolution effect is good, the platinum group metal concentration rate is high, the content of platinum group metals in concentrated slag is high, the recovery rate of platinum group metals is high, and the equipment corrosion degree is low. The method for concentrating platinum group metals from an alumina-based waste catalyst comprises the steps of: (A) primary incineration; (B) crushing; (C) pressure alkali dissolution; (D) filtering; and (E) secondary incineration. The method is suitable for a wide range of materials; the dissolution ratio of aluminum oxide is more than 95 percent; the concentration degree of platinum group metals is 80-120, and the concentration effect is good; the content of platinum group metals in slag is in the range of 10-14 percent, thereby being beneficial for the post procedure of refining platinum group metals; and the recovery rate of platinum group metals in concentration technology is more than 99 percent; and the equipment corrosion degree is low.

Description

technical field [0001] The invention relates to the field of refining platinum group metals, in particular to a method for enriching platinum group metals from alumina-based spent catalysts. Background technique [0002] Platinum group metals include platinum (Pt), palladium (Pd), ruthenium (Ru), rhodium (Rh), osmium (Os), and iridium (Ir). They are low in the earth's crust, have few reserves, and are expensive. [0003] Platinum group metals have been widely used as catalysts for hydrogenation, dehydrogenation, reforming, oxidation, isomerization, disproportionation, cracking and deamination reactions. The catalyst loses its activity due to factors such as poisoning, carbon deposition, carrier structure changes, metal grain aggregation or loss, and the catalyst needs to be replaced regularly. At the end of the catalyst's useful life, the loss of platinum group metals is very small, and these spent catalysts are also of great value. It is of great significance to the recyc...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 贺小塘李勇王欢郭俊梅韩守礼赵雨吴喜龙李子璇李锟刘文
Owner GUIYAN RESOURCE YIMEN
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