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Process of recycling platinum-rhenium aluminum from platinum-rhenium waste catalyst of alumina carrier

A waste catalyst and catalyst technology, applied in the field of extracting platinum, rhenium and aluminum, can solve the problems of low recovery rate, complex process, large amount of waste water, etc., and achieve the effects of short process, simple operation and high recovery rate

Active Publication Date: 2018-12-28
ZHEJIANG TELI RECYCLING RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of the two leaching processes are: 1. The leaching slag is almost not reduced after leaching rhenium, and then feeding and leaching platinum will cause a large amount of labor, high consumption and complicated process
②Alkaline leaching of rhenium first has a large amount of leaching slag, and the slag must contain unleached rhenium, so the recovery rate of rhenium is low
③ The immersion liquid produced by the two leaching steps is doubled, which will inevitably result in a large amount of waste water
The process is long, the cost is high, the metal is dispersed, and a large amount of aluminum is not recycled

Method used

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  • Process of recycling platinum-rhenium aluminum from platinum-rhenium waste catalyst of alumina carrier
  • Process of recycling platinum-rhenium aluminum from platinum-rhenium waste catalyst of alumina carrier
  • Process of recycling platinum-rhenium aluminum from platinum-rhenium waste catalyst of alumina carrier

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] Example 1: The aluminum carrier is leached as follows:

[0045] After the roasting, the catalyst 100g containing 0.21mass% of platinum and 0.32mass% rhenium of the aluminum support was added with 1760ml of water, 240ml of concentrated sulfuric acid, and the temperature was raised and maintained at 100°C for 2 hours, then 10ml of ammonium sulfide (10% content solution) was added, and kept at 30 minutes, add 10ml flocculant (containing 1% polyacrylamide) and keep for 10 minutes, stop stirring and add water to make up the total volume of 2000ml, and filter after standing for 24 hours.

[0046] The results are as follows: (100g of input material weight, 210mg of platinum metal input, and 320mg of rhenium metal input)

[0047]

[0048] Conclusion: It can be seen from the above data that 1. All platinum enters the slag and is enriched. 2. Part of the rhenium enters the leaching solution. The rest all enter the slag for enrichment.

example 2

[0049] Example 2: R410 anion exchange resin adsorbs and desorbs rhenium-containing platinum-rhenium spent catalysts on rhenium-aluminum carriers and is leached with sulfuric acid. The main components of a batch of leachate are as follows:

[0050] Platinum content

Aciditymol / L

Rhenium content (mg / L)

Aluminum content (g / L)

SO 4 2-(g / L)

not detected

0.77

61

26

216

[0051] The above solution is adsorbed rhenium by R410 resin, the solution flow rate is 1 times the resin volume per hour, the resin column is a plexiglass column filled with 100ml resin, the two columns are connected in series, when the volume of the inflow solution is 160L The content of rhenium is equivalent, and the rhenium in the first column is saturated, and the calculation shows that the rhenium co-adsorbed in the first column is 0.061×160=9.76g. That is, the saturated adsorption capacity of rhenium adsorbed by R410 resin is 9.76g / 100ml resin.

[0052] After ...

example 3

[0056] Example 3: Recovery and refining of rhenium and platinum

[0057] Refining of rhenium:

[0058] 1. the first 300ml analysis solution that obtains among the example 2 is concentrated to solution containing rhenium 80g / L after adjusting PH7 with ammoniacal liquor, then removes the ammonium perrhenate that freezing crystallization becomes crude product. ② Add lime to the leaching slag in Example 1 at 700°C for 3 hours at a ratio of 1:1, and then add water for leaching at a solid-to-liquid ratio of 1:3. The leaching solution is a rhenium-containing solution containing about 20-30g / L rhenium. The leaching slag is water leaching platinum-containing slag. ③The leaching solution directly enters the 001×7 cation exchange column for refining, and the crude product ammonium perrhenate is dissolved in water (concentration 60g / L) and then enters the 001×7 cation resin to remove cations such as calcium and ammonium, and after flowing out, the perrhenic acid solution is Neutralize w...

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Abstract

The invention discloses a process of recycling platinum-rhenium aluminum from platinum-rhenium waste catalyst of an alumina carrier. The process includes the steps that (1) the platinum-rhenium catalyst of the alumina carrier is conducted to roasting; (2) the carrier alumina is leached; (3) R410 negative ion exchange resin is used by leaching agent to adsorb rhenium, resin containing the rhenium is obtained and effluent goes to the next step; (4) the effluent from the last step is added with ammonia liquor to react, solid ammonium aluminum sulfate is produced; (5) leaching residue in step (2)is added with lime to conducted to roast; (6) roasting material of (5) is leaching by water; (7) residue containing platinum in step (6) is leaching, spongy platinum is produced by nitre; and (8) 001*7 positive ion exchange resin is used for exchanging, the effluent is neutralized, concentrated, froze through the ammonium hydroxide to produce ammonium perrhenate. The process has the characteristics of short circulation, high recovery rate and simple operation. The alumina carriers are all recycled, no waste water, waste residue is produced of all-wet technology. Platinum recovery rate is greater than 99.0%, rhenium recovery rate is greater than 97.0% and alumina recovery rate is greater than 98.0%.

Description

technical field [0001] The invention relates to a method for extracting platinum, rhenium and aluminum, in particular to a process for recovering platinum-rhenium-aluminum from a platinum-rhenium waste catalyst of an aluminum carrier. Background technique [0002] Platinum group metals have good catalytic effect and are widely used in petroleum refining process. Compared with monometallic platinum catalysts, platinum-rhenium bimetallic catalysts have better catalytic activity, higher stability and can increase the yield of aromatics, and even if 20% of the carbon on the platinum-rhenium catalyst is attached to its surface The selectivity is still maintained in the case, so the demand for platinum-rhenium bimetallic catalysts is increasing. At present, the catalysts used in the petroleum reforming process are mostly platinum-rhenium bimetallic catalysts with alumina as the carrier. The value of platinum-rhenium in a large number of spent catalysts after failure is extremely ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C22B21/00C22B61/00
CPCC22B7/001C22B7/006C22B7/007C22B11/048C22B21/003C22B61/00Y02P10/20
Inventor 陈剑峰孙修文易秉智张宇辉
Owner ZHEJIANG TELI RECYCLING RESOURCES
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