Method for recovering rare earth La and Ce from FCC dead catalyst

A waste catalyst and rare earth lanthanum technology, which is applied in the direction of improving process efficiency, can solve the problems of difficult environmental protection treatment of FCC waste catalyst, high treatment cost, and low recovery rate

Pending Publication Date: 2020-09-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, the waste FCC catalysts are difficult to be treated in an environmentally friendly manner, the treatment cost is high, and the recovery rate is low. A new metho

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The particle size of FCC spent catalyst is 50-100 μm.

[0021] The experimental conditions for the leaching of FCC spent catalysts are: hydrochloric acid concentration 4mol / L, leaching temperature 85°C, liquid-solid ratio 8:1, leaching time 10h, stirring speed 200r / min, leaching rate of rare earth 97%.

[0022] Aluminum removal from the leachate: slowly add the leachate to the NaOH solution with a concentration of 10mol / L at a volume ratio of 4:1, stir while adding, filter, drain, and dry to obtain a rare earth filter cake rich in aluminum after removal.

[0023] Filter cake desiliconization: Dissolve the desiliconized and dried filter cake with 8mol / L hydrochloric acid solution, heat for 5 hours, let it cool at room temperature for 2 hours, and filter to obtain a purified rare earth solution after desiliconization.

[0024] Purification of rare earth solution extraction experiment: P204 was selected as the extraction agent, the volume fraction of the extraction agent w...

Embodiment 2

[0028] The particle size of FCC spent catalyst is 45-110 μm.

[0029] The experimental conditions for the leaching of FCC spent catalysts are: nitric acid concentration 6mol / L, leaching temperature 25°C, liquid-solid ratio 2:1, leaching time 24h, stirring speed 300r / min, leaching rate of rare earth 95%.

[0030] Aluminum removal from the leachate: slowly add the leachate to the NaOH solution with a concentration of 10mol / L at a volume ratio of 5:1, stir while adding, filter, drain, and dry to obtain a rare earth filter cake rich in aluminum after removal.

[0031] Filter cake desiliconization: Dissolve the desiliconized and dried filter cake with 8mol / L hydrochloric acid solution, heat for 5 hours, let it cool at room temperature for 2 hours, and filter to obtain a purified rare earth solution after desiliconization.

[0032] Purification of rare earth solution extraction experiment: P507 was selected as the extraction agent, the volume fraction of the extraction agent was 30%...

Embodiment 3

[0036] The particle size of FCC spent catalyst is 45-110 μm.

[0037] The experimental conditions for the leaching of FCC spent catalysts are: nitric acid concentration 0.5mol / L, leaching temperature 60°C, liquid-solid ratio 10:1, leaching time 4h, stirring speed 500r / min, leaching rate of rare earth 93%.

[0038] Aluminum removal from the leachate: slowly add the leachate to the NaOH solution with a concentration of 10mol / L at a volume ratio of 3:1, stir while adding, filter, drain, and dry to obtain a rare earth filter cake rich in aluminum after removal.

[0039] Filter cake desiliconization: Dissolve the desiliconized and dried filter cake with 8mol / L hydrochloric acid solution, heat for 5 hours, let it cool at room temperature for 2 hours, and filter to obtain a purified rare earth solution after desiliconization.

[0040] Purification of rare earth solution extraction experiment: P507 was selected as the extractant, the volume fraction of the extractant was 60%, the pH o...

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Abstract

The invention relates to a method for recovering rare earth La and Ce from and FCC dead catalyst and mainly solves the problems in the prior art that the FCC dead catalyst can hardly be disposed in anenvironment-friendly manner, disposal cost is high and the recovery rate is low. Through use of the method for recovering the rare earth La and Ce from the FCC dead catalyst, an acid solution is taken as an extracting agent; under a certain temperature and a certain concentration, the acid is used for leaching rare earth elements in the catalyst into the solution, a leaching liquid containing therare earth is obtained, a purified rare earth solution is obtained through removal of Al and Si from the leaching liquid, and then a pure rare earth solution is obtained through extraction and back-extraction. The technical solution effectively solves the above problems and can be used for recovering the rare earth La and Ce from the FCC dead catalyst.

Description

technical field [0001] The invention relates to a method for recovering rare earth lanthanum and cerium from FCC waste catalyst, in particular to a method for extracting lanthanum and cerium rare earth elements in FCC waste catalyst by using a low-temperature acid leaching-impurity removal-extraction process. Background technique [0002] In the modern petroleum refining industry, the Fluid Catalytic Cracking (FCC) process occupies an important position, and FCC catalysts containing molecular sieves are widely used. This type of catalyst has high activity, strong selectivity, good stability, good regeneration performance and Strong anti-poisoning ability and other characteristics. In order to further improve the quality of the FCC catalyst, so that it has higher catalytic activity, better thermal stability and hydrothermal stability, and better regeneration performance, rare earth elements can be used to modify the catalyst during the preparation process. FCC catalysts are ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00
CPCC22B7/007C22B59/00Y02P10/20
Inventor 张宏哲刘政伟郭磊房师平张志远牟桂芹
Owner CHINA PETROLEUM & CHEM CORP
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