Worn out tire tires are heavily polluted

In recent years, with the sustained and rapid economic development of our country, the number of various types of motor vehicles has been increasing year by year, and the number of used tires has also increased year by year. According to statistics, in 2009, China produced 233 million waste tires and weighed about 8.6 million tons. Shandong produces more than 800 tons of used tires each day. The problem of waste tire pollution is also very serious. Scrap tires have become an absolute Black garbage, using a reasonable technical route to dispose of used tires, can not only eliminate pollution but also realize its resource utilization and promote energy conservation and emission reduction.

Waste tire processing status

Disposal of used tires includes storage, landfill, incineration, re-renovation, and regeneration of rubber or rubber powders. However, long-term storage of used tires tends to breed mosquitoes and cause breeding of rodents, and landfills are gradually being replaced by other uses because of concerns about secondary pollution of soil, vegetation, and groundwater. The EU banned the filling of landfills as early as 2003. After 2006, the tires were banned from being shredded and landfilled. Although some heat energy can be recovered from tire incineration, copper, lead and Other heavy metal salts will remain in the fly ash during the incineration process, and sulfur dioxide and other toxic gases will be generated at the same time, which increases the complexity of the subsequent gas purification process and industrial operating costs. In addition, at present, the retreading rate and utilization ratio of domestic used tires are all at a relatively low level. In 2009, the tire renewal rate in China was less than 5%, and the proportion of tire renewal in developed countries was more than 45%.

At present, many provinces in China have emerged small workshops and kilns that use waste tires to carry out oil refining. Due to the low investment, technological and production equipment, the energy consumption is not only huge but also emits large amounts of sulfur dioxide into the surrounding environment. Hazardous gases such as hydrogen sulfide and benzene (more than 100 kg of sulfur dioxide per ton of waste tires produced), along with a large amount of production waste slag, can cause devastating damage to the soil and water. The grass around the workshop is not born and the trees die.

Waste tire green resource treatment technology

Micro-negative pressure pyrolysis technology is a waste tire treatment method with promising development. It refers to the decomposition of the organic components of the tire through heating at an appropriate temperature (300~600°C) under anaerobic or anoxic conditions. In order to remove volatile substances and form solid carbon black, the volatile substances can be condensed and collected to obtain more than 40% of fuel oil. At the same time, about 30% of industrial raw materials such as recycled carbon black and 30% of steel wire can be produced. Its resource recovery rate is high, and the resulting product is convenient for transportation. The value of the product is relatively high, and the fuel oil produced can partially replace finished products such as diesel oil and heavy oil.

Because it is anoxic decomposition, reducing gases can reduce the secondary pollution of harmful components such as sulfur, nitrogen, and heavy metals to the environment. The process does not require expensive gas scrubbers; the micro-negative pressure guarantees that there is no leakage of harmful gases in the production process and is easy to use in the plant area. Clean production. In addition, the combustible gas after pyrolysis can be directly burned after purification, providing all heat for the micro-negative pressure pyrolysis process of waste tires. The main components of the fumes after combustion are nitrogen, carbon dioxide and water vapor, and the solid residue is industrial carbon. black. Therefore, the technology's production process does not require additional heat energy consumption, no waste water, waste gas, and waste residue emissions. It is a low-pollution, low-energy, “green” and efficient treatment method that achieves both economic and environmental benefits and promotes energy conservation and emission reduction. Promote the development of circular economy.