A kind of method for preparing carbon black

Abstract

The invention relates to a method for preparing carbon black, in particular to a method for preparing carbon black for tires by using carbon solid waste as a raw material, and belongs to the technical field of comprehensive utilization of industrial solid waste resources. The method for preparing carbon black of the present invention comprises the following steps: S1, crushing solid carbon waste, leaching in a mixed solution of acid and hydrogen peroxide, filtering, washing, and drying to obtain carbon powder; S2, obtaining carbon powder obtained in S1 The carbon powder is soaked in an alkali solution, evaporated, thermally cracked, and then activated to expand pores and modify to obtain carbon black; the carbon content in the carbon solid waste is greater than 60 wt%. The properties of the carbon black obtained in the present invention are superior to those of N330 carbon black on the market in all aspects, and its physical properties have also been greatly improved after being filled into tire rubber.

Description

technical field

[0001] The invention relates to a method for preparing carbon black, in particular to a method for preparing carbon black for tires by using carbon solid waste as a raw material, and belongs to the technical field of comprehensive utilization of industrial solid waste resources. Background technique

[0002] Carbon black is the main filler and reinforcing agent in the rubber industry. At present, the consumption of carbon black in the rubber industry accounts for 94% of the total consumption, of which 60% is used to make tires. The addition of carbon black can endow rubber products with a series of excellent properties, such as the improvement of tensile strength, hardness and wear resistance. At present, the main production processes of carbon black include tank method, furnace method, thermal cracking method, etc. Most of the raw materials required by these methods for preparing carbon black are natural gas, coal tar, anthracene oil, calcium carbide, heavy ...

Examples

Embodiment 1

[0050] Take 1kg of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, the main element content is (wt.%): C 70.9, Al8.23, O 9.55, F 5.38, Na 2.57, Fe 1.21, crushed to -200 mesh, accounting for 90% , add 30 L of mixed solution of 8 mol / L nitric acid and 2 mol / L hydrogen peroxide, and leaching for 10 h under the conditions of leaching temperature of 80°C and stirring speed of 200 r / min.

[0051]After acid leaching, wash to neutral drying to obtain carbon powder, mix carbon powder and NaOH evenly at a mass ratio of 1:1.7, add 20g of deionized water in turn, stand for immersion for 4 hours, and after standing for immersion, the pulp is evaporated to dryness and dehydrated. Put it in a thermal cracking furnace at 800°C for pyrolysis and carbonization; then transfer it to an activation furnace for activation and hole expansion, and the steam temperature is 600°C to obtain alkali-melting carbon black; after cooling, wash with water to weak alkalinity...

Embodiment example 2

[0054] Take 1kg of carbon slag from a waste battery cathode in a domestic factory, the main element content is (wt.%): C 87.11, Al 2.24, O3.50, Zr 1.64, Ca 1.60, Fe 0.42, P 1.44, S 0.09, Si 0.38, Ti 0.34, crushed to -200 mesh and accounted for 90%, add 25L of a mixed solution of 6mol / L nitric acid and 2mol / L hydrogen peroxide, and leach for 9 hours at a leaching temperature of 75°C and a stirring speed of 180r / min.

[0055] After acid leaching, wash to neutral drying to obtain carbon powder, mix carbon powder and NaOH evenly at a mass ratio of 1:1.5, add 20g of deionized water in turn, stand for immersion for 4 hours, and after standing for immersion, the pulp is evaporated to dryness and dehydrated. Put it in a thermal cracking furnace at 700°C for cracking and carbonization; then transfer it to an activation furnace for activation and hole expansion, and the water vapor temperature is 550°C to obtain alkali-melting carbon black; after cooling, wash with water to weak alkalini...

Embodiment example 3

[0058] Take 1 kg of waste activated carbon from a domestic factory, the carbon element content is 94wt.%, and it is crushed to -200 mesh to account for 90%. Add 10L of a mixed solution of 6mol / L nitric acid and 1mol / L hydrogen peroxide. The leaching temperature is 60°C. Under the condition of stirring rate of 150r / min, leaching was carried out for 8h.

[0059] After acid leaching, wash to neutral drying to obtain carbon powder, mix carbon powder and NaOH evenly at a mass ratio of 1:1.5, add 20g of deionized water in turn, stand for immersion for 4 hours, and after standing for immersion, the pulp is evaporated to dryness and dehydrated. Put it in a thermal cracking furnace at 600°C for pyrolysis and carbonization; then transfer it to an activation furnace for activation and hole expansion, and the water vapor temperature is 550°C to obtain alkali-melting carbon black; after cooling, wash with water to weak alkalinity, and dry to obtain powder carbon black, the obtained carbon ...

technical field

[0001] The invention relates to a method for preparing carbon black, in particular to a method for preparing carbon black for tires by using carbon solid waste as a raw material, and belongs to the technical field of comprehensive utilization of industrial solid waste resources. Background technique

[0002] Carbon black is the main filler and reinforcing agent in the rubber industry. At present, the consumption of carbon black in the rubber industry accounts for 94% of the total consumption, of which 60% is used to make tires. The addition of carbon black can endow rubber products with a series of excellent properties, such as the improvement of tensile strength, hardness and wear resistance. At present, the main production processes of carbon black include tank method, furnace method, thermal cracking method, etc. Most of the raw materials required by these methods for preparing carbon black are natural gas, coal tar, anthracene oil, calcium carbide, heavy ...

Examples

Embodiment 1

[0050] Take 1kg of waste cathode carbon blocks from an aluminum electrolytic cell in a domestic factory, the main element content is (wt.%): C 70.9, Al8.23, O 9.55, F 5.38, Na 2.57, Fe 1.21, crushed to -200 mesh, accounting for 90% , add 30 L of mixed solution of 8 mol / L nitric acid and 2 mol / L hydrogen peroxide, and leaching for 10 h under the conditions of leaching temperature of 80°C and stirring speed of 200 r / min.

[0051]After acid leaching, wash to neutral drying to obtain carbon powder, mix carbon powder and NaOH evenly at a mass ratio of 1:1.7, add 20g of deionized water in turn, stand for immersion for 4 hours, and after standing for immersion, the pulp is evaporated to dryness and dehydrated. Put it in a thermal cracking furnace at 800°C for pyrolysis and carbonization; then transfer it to an activation furnace for activation and hole expansion, and the steam temperature is 600°C to obtain alkali-melting carbon black; after cooling, wash with water to weak alkalinity...

Embodiment example 2

[0054] Take 1kg of carbon slag from a waste battery cathode in a domestic factory, the main element content is (wt.%): C 87.11, Al 2.24, O3.50, Zr 1.64, Ca 1.60, Fe 0.42, P 1.44, S 0.09, Si 0.38, Ti 0.34, crushed to -200 mesh and accounted for 90%, add 25L of a mixed solution of 6mol / L nitric acid and 2mol / L hydrogen peroxide, and leach for 9 hours at a leaching temperature of 75°C and a stirring speed of 180r / min.

[0055] After acid leaching, wash to neutral drying to obtain carbon powder, mix carbon powder and NaOH evenly at a mass ratio of 1:1.5, add 20g of deionized water in turn, stand for immersion for 4 hours, and after standing for immersion, the pulp is evaporated to dryness and dehydrated. Put it in a thermal cracking furnace at 700°C for cracking and carbonization; then transfer it to an activation furnace for activation and hole expansion, and the water vapor temperature is 550°C to obtain alkali-melting carbon black; after cooling, wash with water to weak alkalini...

Embodiment example 3

[0058] Take 1 kg of waste activated carbon from a domestic factory, the carbon element content is 94wt.%, and it is crushed to -200 mesh to account for 90%. Add 10L of a mixed solution of 6mol / L nitric acid and 1mol / L hydrogen peroxide. The leaching temperature is 60°C. Under the condition of stirring rate of 150r / min, leaching was carried out for 8h.

[0059] After acid leaching, wash to neutral drying to obtain carbon powder, mix carbon powder and NaOH evenly at a mass ratio of 1:1.5, add 20g of deionized water in turn, stand for immersion for 4 hours, and after standing for immersion, the pulp is evaporated to dryness and dehydrated. Put it in a thermal cracking furnace at 600°C for pyrolysis and carbonization; then transfer it to an activation furnace for activation and hole expansion, and the water vapor temperature is 550°C to obtain alkali-melting carbon black; after cooling, wash with water to weak alkalinity, and dry to obtain powder carbon black, the obtained carbon ...

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