In the scrapped tires, because the truck tires and the car/light truck tires contain natural rubber, synthetic rubber and steel wire and textile cords, the other coupling agents, stearic acid, zinc oxide, anti-aging agent, micro Crystal wax, plasticizer, resin, high styrene, aromatic oil, sulfur, accelerator, scorch retarder, etc. up to dozens of chemical materials and additives, which account for up to 6 different types of carbon black Great similar.

1, waste tire weight analysis
After the tire has become a waste tire that cannot be used continuously, the weight of the steel wire and the textile cord is basically not lost. Others such as natural rubber, synthetic rubber, coupling agent, stearic acid, zinc oxide, anti-aging agent, microcrystalline wax, and increase Plasticizers, resins, high styrene, aromatic oils, sulfur, accelerators, scorch inhibitors, etc., tires made of dozens of chemical materials and additives mixed with rubber, during operation, through the tread and the ground The wear caused by friction is reduced by 10%. The scrapped car/light truck tires are basically 120 pieces/ton, each weighing about 8.35 kg, and the scrapped truck tires are basically 17 pieces/ton, and each piece weighs about 58.8 kg.

2, the main product of waste tire thermal cracking "cracking oil"
The rubber, carbon black and various chemical additives in the waste tires are catalytically cracked and gasified by a high temperature cracking furnace at 600 ° C to 750 ° C. The gas is cooled and solidified by a condenser, and the cracked oil produced by extrusion is formed. With a calorific value of more than 6500, the calorific value drops to about 3800-4000 kcal to become a waste tire cracking oil. This pyrolysis oil is a black viscous oil with a pungent odor. At the same time, this pyrolysis oil cannot be used alone. It must be mixed with other fuel oils in proportion, and it will continue to emit odor in the environment. Waste tire cracking oil is a poor quality fuel oil. There are many unsafe factors and polluting the environment. The market has a narrow application range and low economic value.

The density is low, the asphaltene content is high, the wax content exceeds the standard, and the flash point is less than 52 ° C. This waste tire cracking oil by-product is extremely easy to explode after transportation and collision after the flash point is extremely low, so the waste tire It also evolved into dangerous waste by the original solid waste through cracking. Judging from the accidents that occurred in Jiangsu Xiangshui Tianjiayi Chemical Co., Ltd., this kind of waste tire cracking oil treatment will cause great harm to the society.

3, the main product of waste tire thermal cracking "tire slag"
When the scrapped tire becomes solid waste, the slag formed by the fission of rubber slag and various chemical aids formed by cracking at a temperature of up to 600 ° C to 750 ° C or higher, the so-called "carbon black" is also a veritable "tire slag". This rubber material containing all the tires is produced, except that a part of the rubber is condensed and discharged by gasification under the action of the catalyst, and part of the residue is extruded into waste tire cracking oil, and the rest remains in the "tire slag". From the source material of thermal cracking of waste tires, can it be seen that the thermal cracking of waste tires produces "carbon black"? Carbon black as a reinforcing material for the rubber industry has strict national standards, and the "tire slag" after thermal cracking of waste tires is not carbon black in terms of carbon black. Compared with carbon black, a reinforcing material used in the rubber industry, ash, The oil is seriously over-standard and contains a lot of sulfur; can this "tire slag" replace the rubber industry's reinforcing semi-reinforcing carbon black? According to experts who have tried this kind of carbon black tires, “The so-called carbon black produced by this method is not a true carbon black with reinforcing effect. It has a small specific surface area, a low degree of structure, and the surface is not activated. It is powdery, has no reinforcing effect of carbon black, and is more prone to secondary pollution." Therefore, this "tire slag" has no economic value in the market. At the same time, the "tire slag" after thermal cracking of waste tires is powdery and dangerous. If it is not treated in a timely and harmless environment, it will cause harm to the environment. It may also provide a way for the fake and inferior carbon black for the rubber industry.

4. Other "steel wire and other" products for thermal cracking of waste tires
If the tire steel wire which is thermally cracked by the waste tire is separated in the production of the rubber powder, the separated steel wire retains its steel wire characteristics and has high value utilization value. However, if the whole tire or the steel wire-containing block is directly subjected to thermal cracking in the thermal cracking of the waste tire, the metallurgical structure of the steel wire after the so-called low-temperature cracking of the whole tire or the steel wire-containing rubber block at 600 ° C to 750 ° C The structure was fundamentally damaged into austenite, and the value of utilization was completely lost.

At the same time, the material of the thermal cracking of the waste tire is flame retarded by the catalyst added in the pyrolysis furnace, and in the cracking process, the non-liquefiable gas generated by the cracking gasification accounts for about 10%, and is exhausted as a self-use fuel. Therefore, the so-called waste tire thermal cracking project can be used 100% of the waste tires, and it becomes empty talk.