Main methods of disposing of used tires
Overall Retreading
Tire retreading is the process of partially repairing, processing and reapplying tread rubber to old tires and then vulcanizing them to restore their usefulness. In Germany, 12% of retreaded tires for cars and 48% of retreaded tires for trucks are used. The total production of retreaded tires is 10,000 tons per year. The quality of domestic tires in China is generally low, and most of the scrap tires have no retreading value. Scrap tires can be used as buffers for ships at docks, road protection fences or soil and water conservation fences, for building sound-absorbing partitions.
Making recycled rubber
Reclaimed rubber refers to the physicochemical process of crushing, heating and mechanical treatment of scrap rubber to change its elastic state into plasticity and stickiness.
Production of rubber powder
The application of rubber powder: one is used in the rubber industry, directly molded or with new rubber to make products; the other is used for modified asphalt pavement, modified asphalt production of waterproofing membrane, coatings and protective layers in the construction industry, etc. The crushing process for producing rubber powder includes ozone crushing, high-pressure blasting crushing, and low-temperature fine grain crushing.
Pyrolysis and incineration
Pyrolysis is the use of external heating to open the chemical chain and decompose organic materials into valuable chemical products such as gas, aromatic-rich oils, and carbon black. Tires have a high calorific value and waste tires can be used as fuel for cement kilns or burned to generate electricity.
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Comparison of tire recycling methods in China
The production of recycled rubber from waste tires is the most widely used method in China. The obtained products are malleable, but the molecular chain of the recycled rubber is greatly damaged, with low molecular weight and very uneven. Practice shows that the use of scrap rubber to produce recycled rubber not only consumes a lot of energy in the production process, but also the performance index of vulcanized rubber in recycled rubber is inferior to that of scrap tires before treatment. At the same time, it has high energy consumption and added value. Low, highlighting the disadvantages of secondary pollution.
The incineration process can recover the heat contained in the waste tires at one time, but its equipment is expensive and easy to produce secondary pollution. The extraction of valuable chemical products after pyrolysis is a relatively new method of reusing scrap tires. This method can produce high calorific value gas, various petroleum products and carbon black. However, the processing costs are high, the recovered products are not economical compared to the current prices of petroleum and carbon black in the market, and the secondary pollution problem needs further study.
The production of rubber powder does not require the processes of desulfurization and refining in the production of recycled rubber. The process is greatly simplified than the traditional production process of recycled rubber, which can save 40% of energy and 80% of water; it can save a lot of manpower, material and power, and the investment cost of equipment is greatly reduced; there is no waste water, waste gas and dust pollution, which can basically eliminate the secondary pollution. The production of rubber powder makes full use of the usable part of waste rubber, which not only reduces the cost of rubber products, but also fully recovers the waste rubber resources. In addition, the application of rubber powder is very wide, can meet the needs of many aspects, import car market everything.