Four ways to help you understand tire recycling in one minute

Time:2020-02-10

Waste tire treatment technologies and methods mainly include four methods: prototype utilization, scrap tires, auxiliary derived fuel (TDF), and pyrolysis.
1.Prototyping
Although the “prototype utilization” of waste tires is not the final treatment, it can extend the life cycle time of waste tires, which is currently the most direct and lowest cost treatment method. Including artificial fishing reefs, tunnel projects, dock projects, agricultural (garden) art uses, entertainment facilities, sand dam projects, etc., but the amount is limited, and whether their use will cause environmental problems.
The processing of “retreaded old tires” is relatively simple, but the market demand is not high and is a low-priced product, which is not easy to promote. Although tire retreading has been a well-established method for many years, it can be equivalent to the use of a new tire, and the cost is less than 1/4 of the new tire. However, with the modernization of automobiles and traffic, the requirements for safe handling of tires at high speeds are becoming increasingly stringent, and retreaded tires cannot reach the same performance as new tires, so the market has gradually shrunk. Basically, tires for passenger cars have not been retreaded. In the past, a large number of retreads for trucks and engineering tires have also fallen below 10%.
2. Crushing and grinding
After the waste tires are “broken” by machinery, they are used as raw materials for building materials and rubber products, including cement tires, floor tiles, or alternative products for related building materials. If the powder is further “ground” and the impurities such as steel wire and cotton wool in the waste tire are removed, rubber powder, recycled rubber and other related rubber products with very high rubber content can be made. Wanrooe Machineryhas a special tire crushing and recycling production line, which can be ground after grinding.
3. Auxiliary fuel
The calorific value of waste tires is more than 8000 kcal / kg, which is higher than 5000 kcal / kg of coal combustion, and the residual ash content after combustion is equivalent to coal combustion, so it is very suitable for industries that require high thermal energy. TDF (Tire derived fuel) provides cement plants with furnaces, power plants with co-generation equipment for steam and electricity, and paper mills with steam equipment as raw materials for energy generation. The proportion of waste tires as energy reuse is higher than material reuse, accounting for about 70%. That is, the use of waste tires as a derivative fuel is currently the largest treatment method.
4. Thermal cracking treatment
The principle of thermal cracking is to place waste tires in an anoxic or inert gas for incomplete thermal degradation, which can produce liquid and gaseous hydrocarbons and carbon residues. This technology first crushes the waste tires and sends them to a thermal cracking reactor. After heating in the reactor, a thermal decomposition reaction is generated. Next, the gaseous products are passed into a condenser, whereby the oil and gas are separated to condense an approximate diesel fraction, and separated The flammable gas is sent to the combustion furnace to provide a continuous heat source for the thermal cracking system. The solid product in the reactor is mainly carbon black. The crude carbon black is separated from the steel wire by magnetic separation. The crude carbon black is obtained by further processing. Commercially available carbon black. The thermal cracking process flow chart is shown in Figure 1.
The thermal cracking method for waste tire disposal can realize the recovery of resources and the full reuse of valuable products. It is one of the important development directions of waste tire treatment in various countries at present. It is also in line with national industrial policies and development plans. According to the basic principles mentioned in the Industrial and Industrial Policy [2010] No. 4 of the “Announcement of the Ministry of Industry and Information Technology of the People’s Republic of China”, recycling waste tires using thermal cracking technology is not only a production process and technological innovation, and It meets the requirements of energy saving and emission reduction, and proposes the best solution for the comprehensive reuse of waste tires.