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A method for recovering valuable elements from aluminum-based petroleum refining spent catalysts

A waste catalyst and petroleum technology, applied in the field of non-ferrous metal metallurgy, can solve the problems of complex separation process and difficult comprehensive recovery, and achieve the effect of simple separation process, significant economic benefits and high economic prospects

Active Publication Date: 2020-07-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the shortcomings of the existing petroleum refining waste catalyst recovery technology, such as complex separation process of valuable elements and difficulty in comprehensive recovery, the present invention provides a method for pretreating petroleum refining waste catalysts by carbothermal reduction to achieve efficient separation and recovery of valuable elements. Method Through carbothermal reduction pretreatment, the properties of the compounds corresponding to the valuable metal elements in the spent catalyst are differentiated and expanded, so as to realize the step-by-step and efficient separation of the valuable elements, and at the same time, the comprehensive recovery of the valuable elements can be realized

Method used

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  • A method for recovering valuable elements from aluminum-based petroleum refining spent catalysts

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Embodiment 1

[0034] (1) Carbothermal reduction roasting process

[0035] Extraction of spent petroleum hydrodesulfurization catalyst Ni-Mo / γ-Al 2 o 3 , After oxidation and roasting at 550°C, it contains the following elements: Al28.1%, Ni 12.3%, V 6.1%, Mo 4.7%. Add sodium carbonate according to 1.2 times the theoretical demand, then add carbon powder 8 times the theoretical amount, mix and grind until all the abrasives pass through the 200 molybdenum mesh sieve. Place the grinding material in a heating furnace under nitrogen protection, heat it to 950°C at a heating rate of 5°C / min, keep it warm for 180min, then cool it to room temperature and take it out.

[0036] (2) Step-by-step extraction process of valuable elements

[0037] Add the carbothermal reduction product to 2mol / L sodium hydroxide solution, stir and leaching in a water bath at 80°C for 60 minutes, and filter while hot to obtain a sodium aluminate solution. The leaching rate of aluminum exceeds 99%, and metals such as moly...

Embodiment 2

[0039] (1) Carbothermal reduction roasting process

[0040] Extraction of spent petroleum hydrodesulfurization catalyst Ni-Mo / γ-Al 2 o 3 , After oxidation and roasting at 500°C, it contains the following elements: Al28.1%, Ni 12.3%, V 6.1%, Mo 4.7%. Add sodium carbonate according to 2.0 times the theoretical demand, then add graphite powder 5 times the theoretical amount, mix and grind until all the abrasives pass through the 200 molybdenum mesh sieve. Place the grinding material in a heating furnace under nitrogen protection, heat it to 1050°C at a heating rate of 10°C / min, keep it warm for 120min, then cool it to room temperature and take it out.

[0041] (2) Step-by-step extraction process of valuable elements

[0042] Add the carbothermal reduction product into deionized water, stir and leaching in a water bath at 80°C for 120 minutes, and filter while hot to obtain a sodium aluminate solution. The leaching rate of aluminum exceeds 99.6%, and the concentration of metal ...

Embodiment 3

[0044] (1) Carbothermal reduction roasting process

[0045] Extraction of Co-Mo / γ-Al Waste Catalyst for Petroleum Hydrodesulfurization 2 o 3 , After oxidation and roasting at 550°C, it contains the following elements: Al37.9%, Co5.4%, V1.8%, Mo12.7%. Add sodium hydroxide according to 1.5 times of the theoretical demand, then add anthracite coal powder 5 times of the theoretical amount, mix and grind until all the grinding materials pass through the 150 molybdenum mesh sieve. Place the grinding material in a heating furnace under the protection of argon, heat it up to 850°C at a heating rate of 4°C / min, keep it warm for 600min, then cool it to room temperature and take it out.

[0046] (2) Step-by-step extraction process of valuable elements

[0047] Add the carbothermal reduction product to 0.5mol / L sodium hydroxide solution, stir and leaching in a water bath at 80°C for 60 minutes, filter while hot to obtain a sodium aluminate solution, the leaching rate of aluminum reache...

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Abstract

The invention discloses a method for recycling a valuable element from an aluminum-based petroleum refining waste catalyst. According to the method, carbon thermal reduction is adopted for pretreatingthe waste catalyst, three kinds of valuable metallic elements in the waste catalyst generate aluminum salt capable of being dissolved in water, metal element nickel and cobalt with magnetism and acidsolubility and metal carbide with acid resistance and alkali resistance, nature difference expansion of valuable element compounds achieves step-by-step extraction of the valuable elements, particularly, the water solution or alkali solution is used for extracting aluminium oxide, through magnetic selection or the acid solution, nickel and cobalt are extracted, and enrichment and recycling of rare metal carbide can be achieved. The method has the advantages that the process is simple and reasonable, the carbon reduction raw material is economic and environment-friendly, meanwhile, efficient separation and comprehensive recycling of valuable elements in the waste catalyst can be achieved, and the economic benefit is obvious.

Description

technical field [0001] The invention relates to a method for realizing high-efficiency and comprehensive recovery of valuable elements in spent petroleum catalysts by carbothermal reduction pretreatment, and belongs to the technical field of nonferrous metal metallurgy. Background technique [0002] Petrochemical industry is a catalyst-centered industrial sector, and about 90% of petroleum refining reactions need catalysts to proceed. During the use of the catalyst, the catalyst will be deactivated due to carbon deposition, heavy metal poisoning, and sintering of the active phase. When these deactivated catalysts cannot be economically regenerated, they become spent catalysts. Spent catalysts usually contain organic matter such as carbon deposits and residual oil, as well as sulfur, heavy metal elements nickel, cobalt, rare metal elements tungsten, molybdenum, vanadium, and carrier alumina. Without harmless disposal, unstable toxic and harmful substances in spent catalysts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00B03C1/02
CPCB03C1/02C22B7/001C22B7/007C22B7/008C22B7/009Y02P10/20
Inventor 徐盛明王文强韩宇
Owner TSINGHUA UNIV
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