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Method for treating vanadium-containing waste catalyst

A waste catalyst, sodiumization technology, applied in the direction of improving process efficiency, etc., can solve the problems of reducing the leaching rate of sodiumized clinker, affecting the conversion rate of soluble sodium salt, vanadium wrapping, etc.

Inactive Publication Date: 2021-05-07
BEIJING PRUDENT CENTURY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are a series of problems in the existing sodium roasting process for treating spent hydrogenation catalysts: first, powdery materials are easily affected by factors such as material density, particle inhomogeneity, and friction, which makes the contact between spent catalysts and sodium additives insufficient, resulting in Insufficient sodium roasting reaction affects the conversion rate of soluble sodium salt; secondly, the existing sodium roasting process requires a suitable temperature, but the temperature of the rotary kiln is difficult to control; if the temperature is low, the conversion rate of soluble sodium salt is low, resulting in The recovery rate of vanadium is low; if the temperature is high, it is easy to cause sintering of the material, resulting in the vanadium being wrapped by the glass phase, thereby reducing the leaching rate of the sodiumized clinker; finally, unlike the vanadium-containing waste, the spent hydrogenation catalyst contains a certain amount carbon and sulfur, during the sodiumization and roasting process of the waste catalyst, the oxidation reaction of carbon and sulfur releases a large amount of heat, which is prone to local overheating, which not only affects the vanadium leaching rate, but also causes ring formation in the rotary kiln, which seriously affects the smooth progress of production
In summary, there is currently a lack of a treatment method for spent hydrogenation catalysts

Method used

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  • Method for treating vanadium-containing waste catalyst
  • Method for treating vanadium-containing waste catalyst
  • Method for treating vanadium-containing waste catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Get 500kg of deoiled vanadium-containing waste catalyst, the original material is columnar particles, the length is 5-15mm, and the raw material composition is as shown in Table 1; the raw material is put into high-energy ball mill to grind until the waste catalyst particle size D90=0.147mm ;

[0037] Table 1 Composition Data Table of Vanadium-containing Waste Catalyst

[0038] substance V 2 o 5

Mo Ni co Fe C S P al 2 o 3

oily hydrocarbons content(%) 16.30 2.02 6.82 0.15 1.38 15.49 9.61 0.30 19.58 12.53

[0039] (2) with the Na 2 CO 3 (200kg) add simultaneously in the roller mixer and carry out once rolling, and the rolling time is 15min; Then add the water glass of powdery spent catalyst gross mass 3%, the sodium bentonite of 2% and the water of 7%, secondary Roll and mix for 15 minutes to obtain the mixed material;

[0040] (3) Add the mixed material obtained in step (2) into the disc granulator, and sp...

Embodiment 2

[0045] (1) Get the same deoiled vanadium-containing waste catalyst 500kg as in Example 1, put it into high-energy ball milling, until the waste catalyst particle size D90=0.147mm;

[0046] (2) with step (1) gained powdery waste catalyst and 30% Na 2 CO 3 (150kg) is added in the roll mixer simultaneously and carries out once rolling, and the rolling time is 15min; Then add the water glass of powdery spent catalyst gross mass 3%, the sodium bentonite of 2% and the water of 7%, secondary Roll and mix for 15 minutes to obtain the mixed material;

[0047] (3) Add the mixed material obtained in step (2) into the disc granulator, and spray water into it at the same time to prepare the mixed material granules, whose particle size is controlled as D90=3mm;

[0048] (4) Flatten the mixed material granules obtained in step (3), blow in hot air at 150° C. for 1 hour to dry the mixed material granules, and naturally freeze the obtained dried granules in the air for 4 hours to obtain cold...

Embodiment 3

[0052] (1) Get the same deoiled vanadium-containing waste catalyst 500kg as in Example 1, put it into high-energy ball milling, until the waste catalyst particle size D90=0.147mm;

[0053] (2) with step (1) gained powdery waste catalyst and 40% Na 2 CO 3 (200kg) add simultaneously in the roller mixer and carry out once rolling, and the rolling time is 15min; Then add the water glass of powdery spent catalyst gross mass 5%, the sodium bentonite of 4% and the water of 7%, secondary Roll and mix for 15 minutes to obtain the mixed material;

[0054] (3) Add the mixed material obtained in step (2) into the disc granulator, and spray water into it at the same time to prepare the mixed material granules, whose particle size is controlled as D90=3mm;

[0055] (4) Flatten the mixed material granules obtained in step (3), and blow hot air at 150°C for 1 hour to dry the mixed material granules. The resulting dried granules are naturally cooled in the air for 4 hours to obtain cold-set ...

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Abstract

The invention provides a method for treating a vanadium-containing waste catalyst. The method comprises the following steps of, A) carrying out ball-milling on the deoiled waste catalyst to obtain a powdery waste catalyst; B) mixing the powdery waste catalyst to obtain a mixed material; C) granulating the mixed material, and drying to obtain mixed material particles; and D) cooling and solidifying the mixed material particles, and roasting in a fluidized bed furnace to obtain sodium modified clinker. According to the method, sodium salt roasting in the fluidized bed furnace is realized, the contact between a sodium salt additive and the vanadium-containing waste catalyst and the contact between cold solid particles and air are strengthened, the chemical reaction kinetic conditions of sodium salt roasting are improved, the leaching rate of vanadium in the sodium salt clinker is increased, and the vanadium leaching rate of the sodium salt clinker can reach 95% or above; the problems that the temperature of a rotary kiln is not easy to control and the rotary kiln is easy to knot are solved, and organization and implementation of production are facilitated; and during sodium salt roasting, self-heating generated by oxidation of carbon and sulfur in the waste catalyst is utilized, so that the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for treating spent vanadium-containing catalysts. Background technique [0002] Hydrogenation catalysts are widely used in the petrochemical industry, and the demand for hydrogenation catalysts in the petrochemical industry is increasing year by year. After long-term use, the hydrogenation catalyst will be deactivated due to the deposition of heavy metals, and then it will be scrapped. At present, about 120,000 tons of hydrogenation catalysts are discarded every year in the world. Spent hydrogenation catalysts are dangerous solid wastes that seriously pollute the environment. However, the content of vanadium in spent catalysts is high, which is a high-quality secondary resource. Therefore, it is of great significance to develop harmless treatment and comprehensive recycling technologies for spent vanadium-containing catalysts. [0003] Sodium roasting is ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/10C22B1/243C22B34/22
CPCC22B7/001C22B1/243C22B1/10C22B34/225C22B7/006Y02P10/20
Inventor 黄绵延常耀超黄明星葛启明王为振高崇刘会超
Owner BEIJING PRUDENT CENTURY TECH CO LTD
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