Purification process of pyrolysis carbon black of waste tire

A purification process, carbon black technology, applied in the direction of fibrous fillers, etc., can solve the problems of difficulty in ash content, inability to recover carbon black for reuse, and restrict the economical efficiency of recovery process, etc.

Active Publication Date: 2012-06-20
NIUTECH ENVIRONMENT TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of them use the pickling and alkali washing process to improve the quality of carbon black, but this process is only aimed at carbon black with a relatively single composition.
Now with the advancement of synthetic tire technology, in order to improve the rolling resistance of tires, additives such as silica have been added during tire processing, so that the ash in the carbon black obtained from pyrolysis tires except zinc oxide, calcium carbonate, sulfide and other components, It also contains more silicon dioxide, the composition is more and more complex, and the treatment is more difficult. The simple pickling and alkali washing process can't do anything for this kind of carbon black
At the same time, since pyrolysis carbon black is a powder composed of nano-sized particles, it is more difficult to reduce the ash content in it.
In addition, some organic matter is deposited on the carbon black during the pyrolysis process of the tire, which makes the volatile content of the pyrolysis carbon black higher
The high content of ash and volatile matter restricts the utilization of recycled carbon black to a large extent, making it impossible to reuse it in the rubber synthesis process, so that the recovered carbon black cannot be reused again, which restricts the recovery of the entire recycling process. economy

Method used

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  • Purification process of pyrolysis carbon black of waste tire
  • Purification process of pyrolysis carbon black of waste tire
  • Purification process of pyrolysis carbon black of waste tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A carbon black purification process, its concrete steps mainly comprise:

[0021] (1) One pickling: Add cracking carbon black crushed to 400 meshes and 10% nitric acid solution into the reactor according to the solid-to-liquid ratio of 1:8 (kg:L), stir at 50°C for 30min, and filter; The gas is absorbed with lye;

[0022] (2) Washing with water The carbon black after pickling and filtering is mixed with water (total hardness 87mg / L) in a ratio of 1:10 (kg:L) by solid-liquid ratio, stirred for 10min, filtered, and the filtrate is used for subsequent use;

[0023] (3) Alkali washing The carbon black after washing and filtering is mixed with the sodium hydroxide solution of 1mol / L in a solid-to-liquid ratio of 1:8 (kg:L), stirred for 10min, and filtered;

[0024] (4) Secondary pickling, the filtrate of step (2) is fully mixed and stirred for 10min with the carbon black after alkali washing and filtration, and filters;

[0025] (5) Secondary water washing The carbon black ...

Embodiment 2

[0028] A carbon black purification process, its concrete steps mainly comprise:

[0029] (1) One pickling: Add cracking carbon black crushed to 600 meshes and 15% nitric acid solution into the reactor according to the solid-to-liquid ratio of 1:12 (kg:L), stir at 70°C for 30min, and filter; The gas is adsorbed by activated carbon;

[0030] (2) Water washing The carbon black after pickling and filtering is mixed with water (total hardness 88mg / L) in a ratio of 1:10 (kg:L) by solid-liquid ratio, stirred for 10min, filtered, and the filtrate is used for subsequent use;

[0031] (3) Alkali washing The carbon black after washing and filtering is mixed with the potassium hydroxide solution of 1mol / L in a ratio of 1: 10 (kg: L) in a solid-to-liquid ratio, stirred for 10 min, and filtered;

[0032] (4) Secondary pickling, the filtrate of step (2) is fully mixed and stirred for 10min with the carbon black after alkali washing and filtration, and filters;

[0033] (5) Secondary water ...

Embodiment 3

[0036] A carbon black purification process, its concrete steps mainly comprise:

[0037] (1) One pickling: Add cracking carbon black crushed to 500 meshes and 12% nitric acid solution into the reactor according to the solid-to-liquid ratio of 1:9 (kg:L), stir at 60°C for 30min, and filter; The gas is absorbed with lye;

[0038] (2) Washing with water The carbon black after pickling and filtering is mixed with water (total hardness 85mg / L) in a ratio of 1:10 (kg:L) by solid-liquid ratio, stirred for 10min, filtered, and the filtrate is used for subsequent use;

[0039] (3) Alkali washing The carbon black after washing and filtering is mixed with the potassium hydroxide solution of 1mol / L in a solid-to-liquid ratio of 1:9 (kg:L), stirred for 10min, and filtered;

[0040] (4) Secondary pickling, the filtrate of step (2) is fully mixed and stirred for 10min with the carbon black after alkali washing and filtration, and filters;

[0041] (5) Secondary water washing The carbon bla...

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Abstract

The invention relates to a carbon black purification process, and in particular relates to a purification process of pyrolysis carbon black of a waste tire, which comprises the steps of washing with acid, washing with alkali, and performing acid washing once again to carbon black which is subjected to acid and alkali washing processes. According to the purification process, the ash content of carbon black is reduced to 2.6 percent from 18.7 percent, the volatile component content is reduced to 5.0 percent from 9.5 percent, and the reinforcing property to rubber is superior to that of a semi-reinforcing carbon black and basically reaches the reinforcing level of N330. The acid-wash filtrate generated in the production process can be reused in a purification system after being adjusted.

Description

technical field [0001] The invention relates to a carbon black purification process, in particular to a waste tire pyrolysis carbon black purification process. Background technique [0002] With the rapid development of society, there are more and more waste rubber tires. Because they are difficult to degrade in nature, they have caused great pollution to the environment. People are working hard to find an ideal solution. Since waste tires can recover combustible gas, oil and carbon black after pyrolysis, it provides a high value-added and environmentally friendly recycling route for the resource utilization of waste tires. [0003] As we all know, adding carbon black to synthetic rubber can significantly enhance the rubber's constant elongation, tensile strength, tear resistance and wear resistance, and prolong the service life of rubber products. Therefore, more and more people are committed to improving cracking. The recovered carbon black quality allows it to be reused ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/56
Inventor 牛晓璐
Owner NIUTECH ENVIRONMENT TECHNOLOGY CORPORATION
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