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Method of recovering platinum and rhenium from waste catalyst

A technology of waste catalyst and rhenium sulfide, applied in the field of recovering platinum and rhenium, can solve the problems of low recovery rate, dilution of platinum concentration, low recovery rate of rhenium, etc., and achieve the effect of high recovery rate

Inactive Publication Date: 2007-11-14
JX NIPPON MINING & METALS CORP
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  • Abstract
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Problems solved by technology

[0005] However, the method of leaching platinum and rhenium with an acid such as aqua regia has a low leaching rate, and in the case of rhenium, the recovery rate of rhenium in the subsequent sulfidation treatment is low. In order to solve the above problems, it is necessary to repeatedly perform leaching and other treatments. In addition, because the leaching acid is excessive, the platinum concentration becomes thinner, so there is a disadvantage that it takes a lot of labor and time to obtain a high recovery rate through reduction, and thus it is not economical.
[0006] Furthermore, when the direct dry treatment method is used, since rhenium is very easy to oxidize and volatilize at high temperatures, the recovery rate is low, and the oxidized and volatilized rhenium adheres to the exhaust flue pipes, etc., causing hygroscopic oxidation. The problem of rhenium corroding exhaust flue piping

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  • Method of recovering platinum and rhenium from waste catalyst

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Experimental program
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Effect test

Embodiment 1

[0053] 15g of the spent catalyst containing 0.22mass% platinum and 0.43mass% rhenium loaded on a porous carrier containing alumina was used in 150mL of various leaching solutions of various concentrations under the temperature conditions from room temperature to 90°C, After leaching with a reaction time of 30 minutes to 120 minutes, filter, measure the amount of filtrate, analyze the filtrate, obtain the leaching rate of rhenium, and obtain the results in Table 1.

[0054] The leaching rate of rhenium is high in alkaline solution, especially sodium carbonate (Na 2 CO 3 ) or sodium hydroxide (NaOH) solution.

[0055] As for the leaching temperature conditions, the higher the temperature under any condition, the better. When the temperature is above 90°C, the leaching rate of rhenium above 90% can be obtained.

[0056] In 4mass% NaOH solution, when the reaction time is more than 30 minutes, the rhenium leaching rate of more than 90% can be obtained.

[0057] Table 1 Relations...

Embodiment 2

[0061] In the rhenium leaching process, in order to grasp the relationship between the rhenium leaching rate and the concentration of the NaOH solution, 15 g of the spent catalyst was put into NaOH / (Re+Pt+Al 2 o 3 )=0.006~6.9 in the NaOH solution 150mL of the various concentrations of equivalent range, filter after leaching 1 hour, after measuring the filtrate amount, analyze the filtrate, obtain the leaching rate of each component, thereby obtain the result of Fig. 2. If more than 0.4 times of the theoretical amount of NaOH is added, the leaching rate of rhenium will be more than 90%.

Embodiment 3

[0063] Put 220 g of spent catalyst containing 0.22 mass% platinum and 0.43 mass% rhenium loaded on a porous carrier containing alumina into 1.1 L of a NaOH concentration solution equivalent to 0.4 times the theoretical amount, and leach rhenium at a temperature of 90°C After 1 hour, solid-liquid separation was carried out, and the platinum concentration in the filtrate was analyzed.

[0064] The platinum concentration in the filtrate was 64 mg / L, and the rhenium concentration was 800 mg / L. Get 5 parts of 200mL described filtrate respectively, be heated to 90 ℃, add the concentration of each condition required amount in this solution again and be the ferrous sulfate (FeSO4 of 43g / L) 4 ·7H 2 (2) solution, and carry out after 10 minutes reaction, filter, the platinum in filtrate, rhenium concentration are analyzed, obtain the result of table 2.

[0065] If more than 1.5 times the theoretical amount of the ferrous sulfate solution required for platinum reduction is added, the pl...

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Abstract

The invention provides a method of recovering platinum and rhenium from a waste catalyst carried on an alumina-containing porous support with a high recovery. The method of recovering platinum and rhenium from a waste catalyst carried on an alumina-containing porous support comprises causing platinum and rhenium to leach out with an alkali solution, reducing and filtering the platinum in the leached solution, adsorbing the rhenium in the leached solution with an anion exchange resin, eluting rhenium from the resin with hydrochloric acid and sulfurizing the rhenium in the eluted solution to recover as rhenium sulfide.

Description

technical field [0001] The present invention relates to a process for the recovery of platinum and rhenium from spent catalysts containing platinum and rhenium supported on a porous carrier containing alumina, said porous support containing alumina. Background technique [0002] In the past, the method of recovering platinum and rhenium from spent catalysts containing platinum and rhenium supported on a porous carrier containing aluminum included leaching rhenium with a sulfuric acid solution, and then extracting rhenium from the leaching solution with an anion exchange resin or solvent extraction. , and the method of recovering platinum as a leaching residue (Patent Document 1: USP3672874). [0003] In this method, when the aluminate ions in the solution obtained by leaching alumina with a sulfuric acid solution are treated, a residue with very poor filterability is generated, which makes the operability of filtration very complicated. [0004] In addition, as a method of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/04C22B3/22C22B11/00C22B61/00
CPCY02P10/20Y02P20/584
Inventor 佐佐木康胜副浩二齐藤淳
Owner JX NIPPON MINING & METALS CORP
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