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The Splitting Decomposition of Discard Tires Yields Carbon Black

Author : Clirik


Converting Waste Tires into Carbon Black Through Oil Refining


Apart from tire oil, also known as fuel oil, waste tires yield steel wire, carbon black, and combustible gases. The rubber component of the tires is converted into oil through an oil refining equipment and exported from a cracking furnace. After the cracking process is completed, what remains in the furnace are carbon black and steel wire extracted from the tires. 


scrap tire


Three components derived from the pyrolysis process of used tires are produced in the following proportions: tire oil, 40%, carbon black, 30% and wire, 15%. This implies that approximately 0.3 tons of carbon black can be obtained from a ton of used tires. The resulting crude black carbon, produced by thermal cracking, is a solid, powdery substance that necessitates transport and storage in an enclosed environment. While carbon black can be recycled, improper handling may result in secondary contamination and waste of resources.


Rough Processing of Carbon Black


Tire cracking exhibits superior processing capacity, economic efficiency and low environmental impact compared to traditional treatments. It not only recovers high-value products, but also aligns with the principles of resource recovery, harm reduction and waste minimization. The coarse carbon black produced by tire cracking can be refined to powder using a carbon black grinding mill for higher application values.


ultrafine grinding mill

The coarse carbon black produced in the cracking process has a mesh size of about 50 - 60. A carbon black mill is used to grind the cracked coarse carbon black to a minimum of 325 mesh to achieve N grade carbon black quality. The end product is similar to the widely used N330 on the market today and can be used as a reinforcement, filler or colorant in the basic rubber and plastic industries. It can be employed in the production of rubber seals, rubber triangle bands, plastic products, and pigments.


The "Reinforcing" Effect of Carbon Black on Rubber


The purpose of reinforcing rubber is to enhance its tensile properties, tear resistance, constant elongation stress, and wear resistance in order to increase the elasticity and durability of rubber products. Carbon black primarily adjusts the reinforcement effect by controlling the size, structure, and dosage of carbon black particles.

(1) Tensile properties:

Carbon black exhibits a small particle size, high surface activity, significant structure, and remarkable tensile strength. Initially increasing the amount of carbon black enhances the tensile strength but eventually leads to a decline.


(2) Tear strength:

 The small particle size of carbon black results in high tearing strength. For crystalline rubber with identical particle sizes, low-structure carbon black has higher tear resistance while for amorphous rubber, high-structure carbon black is more effective. Increasing the amount of carbon black first improves and then reduces its tearing strength.


(3) Fixed elongation stress and hardness:

 Carbon black offers several advantages such as a small particle size, significant structure, large surface activity, and dosage-dependent fixed elongation stress and hardness of compounds; among these factors, structural degree exerts the most substantial influence on them. Carbon black's impact on rubber material's tensile stress and hardness is much greater than that of rubber seed or vulcanization system.


(4) Wear resistance:

 Small-sized particles with high surface activity enable good dispersion resulting in excellent wear resistance for rubber materials containing carbon black.


(5) Elasticity:

Compounds featuring small particle sizes, significant structures, large surface activities, and dosages exhibit poor elasticity where increasing amounts of carbon have a more pronounced effect.


Recommendation for Grinding Mill


ultrafine grinding mill

Ultrafine Grinding Mill

Capacity: 0.2 - 45 t/h

Max Feeding Sive: 25 mm

Powder Fineness: 325 - 3000 mesh


Ultrafine grinding mill is a device utilized for pulverizing solid materials into powder through grinding, which serves as a crucial unit operation in numerous industrial processes. It finds extensive applications in the fields of metallurgy, building materials, chemical engineering, and mining.

Ultrafine grinding mill is specifically designed for the fine grinding of various brittle materials with a Mohs hardness below 7. Apart from carbon black, it can also process an array of other materials including calcium carbonate, barite, dolomite, calcite, limestone, kaolin, bentonite marble gypsum quartz feldspar clay talc fluorite white mud mica refractory glass; encompassing approximately 1000 different types of materials.


Grinding Mill Advantages

1. The mill output exceeds that of other mills by 40%.


2. Its key parts are made of high-quality casting materials, ensuring a service life of 2-5 years.


3. the fineness of the finished powder can be adjusted between 325-3000 mesh at any time.


4. With a rigorous design and no loose screws or damage to the machine.


5. Mill use close system is an environmentally friendly and reliable choice.

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