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Comprehensive recovery and utilization method for waste vanadium catalyst

A waste vanadium catalyst and saponification technology, which is applied in chemical recovery, silicate, alkali metal silicate, etc., can solve the problems of high energy consumption, recovery rate needs to be further improved, long process flow, etc., and achieve simplified process, Water-soluble, cheap and easy to obtain, and the effect of improving economic benefits

Active Publication Date: 2017-09-19
KAIFENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the purity of the product obtained by this method is high, the energy consumption is high, the process flow is long, and the recovery rate needs to be further improved.

Method used

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  • Comprehensive recovery and utilization method for waste vanadium catalyst
  • Comprehensive recovery and utilization method for waste vanadium catalyst
  • Comprehensive recovery and utilization method for waste vanadium catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: as figure 1 The method for comprehensive recovery and utilization of spent vanadium catalyst comprises the following steps:

[0044] 1) Water immersion: Grind the spent vanadium catalyst with a particle size of 370 μm, immerse in water at a mass ratio of 2.5:1, 100°C, and 1.5 hours, and filter to obtain water The leaching liquid and the water leaching filter residue, washing the water leaching filter residue with clear water until neutral to obtain the water leaching residue, combining the water leaching filtrate and the washing liquid to obtain the water leaching liquid, filtering and separately collecting the water leaching residue and the water leaching liquid for subsequent use;

[0045]2) Reductive acid leaching: to step 1) the water leaching residue that obtains is 2.5ml:1g at liquid-solid ratio, H 2 SO 4 Add the reducing agent potassium sulfite under the condition that the mass percent concentration is 12%, repeat reducing acid leaching four times...

Embodiment 2

[0053] Such as figure 1 The method for comprehensive recovery and utilization of spent vanadium catalyst comprises the following steps:

[0054] 1) Water immersion: Grind the spent vanadium catalyst with a particle size of 300 μm, immerse in water at a mass ratio of water to spent vanadium catalyst of 2.0:1, water immersion temperature of 100°C, and leaching time of 1.5 hours, and filter to obtain water The leaching liquid and the water leaching filter residue, washing the water leaching filter residue with clear water until neutral to obtain the water leaching residue, combining the water leaching filtrate and the washing liquid to obtain the water leaching liquid, filtering and separately collecting the water leaching residue and the water leaching liquid for subsequent use;

[0055] 2) Reductive acid leaching: to the water leaching slag obtained in step 1) at a liquid-solid ratio of 2.0ml:1g, H 2 SO 4 Add the reducing agent potassium sulfite under the condition that the m...

Embodiment 3

[0063] Such as figure 1 The method for comprehensive recovery and utilization of spent vanadium catalyst comprises the following steps:

[0064] 1) Water immersion: Grind the spent vanadium catalyst with a particle size of 350 μm, immerse in water at a mass ratio of water to spent vanadium catalyst of 3.0:1, water immersion temperature of 100°C, and leaching time of 1.5 hours, and filter to obtain water The leaching liquid and the water leaching filter residue, washing the water leaching filter residue with clear water until neutral to obtain the water leaching residue, combining the water leaching filtrate and the washing liquid to obtain the water leaching liquid, filtering and separately collecting the water leaching residue and the water leaching liquid for subsequent use;

[0065] 2) Reductive acid leaching: to the water leaching slag obtained in step 1) at a liquid-solid ratio of 3.0ml:1g, H 2 SO 4 Add the reducing agent potassium sulfite under the condition that the m...

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Abstract

The invention discloses a comprehensive recovery and utilization method for a waste vanadium catalyst. The method comprises the steps that water leaching and reductive acid leaching are sequentially conducted on the waste vanadium catalyst; silicon is separated and recycled by being prepared into sodium silicate through alkaline leaching in a residue leaching mode; single-stage extraction is conducted on leachate through saponification P204, vanadium and potassium are extracted and separated through vanadium extraction technologies of tail liquid concentration and separate re-extraction, potassium is separated by preparing potassium sulphate from raffinate through evaporation and concentration, and vanadium is recycled by preparing vanadium pentoxide from an extraction phase through the processes of back extraction, vanadium precipitation, calcination and the like. Through the extremely high selection characteristic of the saponification P204, not only are the extraction capacity, the utilization rate and the vanadium extraction rate increased, but also influences of iron, phosphorus and arsenic on V2O5 purity are effectively avoided, vanadium precipitation can be directly conducted after back extraction, a high-purity vanadium product is prepared, and the phenomenon that chlorine is released in the oxidization process to pollute the environment is avoided. The method has the advantages that the extraction stages and part of the processes are reduced, the technological process is simplified, the cost is reduced, the economic benefit is increased, and the double effects of making the best use of everything and protecting the environment are achieved.

Description

technical field [0001] The invention relates to the field of catalyst recovery in the chemical industry, in particular to a method for comprehensive recovery and utilization of spent vanadium catalysts. Background technique [0002] With the development of the chemical industry, vanadium-containing catalysts are widely used in the production of sulfuric acid by contact method, desulfurization, dehydrogenation of heavy oil, and synthesis of special rubber. After being used for a period of time, these catalysts gradually lose their catalytic effect due to poisoning and other reasons, and become waste vanadium catalysts. If these waste vanadium catalysts are piled up randomly without treatment, they will occupy a large amount of land resources and pollute the environment. At the same time, waste vanadium catalysts also contain many elements of economic value, which should be actively recycled to turn waste into treasure, save resources, and take into account environmental and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/10C22B34/22C22B3/38C01B33/32
CPCC01B33/32C22B7/006C22B26/10C22B34/225C22B3/3846Y02P10/20Y02P20/584
Inventor 郝喜才娄童芳姬红占桂荣曹明师兆忠
Owner KAIFENG UNIV
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