Method for low-temperature pyrolysis treatment on waste tires under nitrogen atmosphere

Abstract

The invention provides a method for low-temperature pyrolysis treatment on waste tires under nitrogen atmosphere. The method with the technology mainly comprises the following steps of (1) uniformly mixing the crushed waste tire powder with size of 60 to 100 mesh and the prepared oil according to a certain ratio, so as to obtain an oil adhesive slurry; (2) conveying the oil adhesive slurry to a pyrolysis reactor by a pump, and reacting at the pressure of 0.01MPa to 4MPa; (3) reacting at the temperature of 230 to 350 DEG C, and staying for 30 to 120min; (4) separating and purifying the pyrolysis gas, using as the fuel gas to provide the heat required by the device, and separating liquid and solid products, so as to obtain pyrolysis oil and pyrolysis carbon black; (5) using the heavy component of the pyrolysis oil as the prepared oil, and continuing to recycle; (6) using the pyrolysis carbon black to provide the heat required by the device, or modifying the pyrolysis carbon black as thetire reinforcing carbon black. The method provided by the invention has the advantages that the prepared oil is used as a slurry preparation solvent, the continuous charging and discharging functionsof the waste tire pyrolysis device can be realized by the oil adhesive slurry, the technology operation is greatly simplified, the pyrolysis temperature is low, the yield rate of the pyrolysis gas islow, the yield rate of the pyrolysis oil is high, the quality of the pyrolysis carbon black is high, and the like.

Description

technical field [0001] The invention belongs to the technical field of rubber pyrolysis, and more specifically relates to a method for treating waste tires by low-temperature pyrolysis in a nitrogen atmosphere. Background technique [0002] As of the end of 2016, the number of motor vehicles in my country reached 290 million, including 194 million cars. At the same time, about 300 million waste tires were produced in 2016, with a weight of more than 10 million tons. Waste rubber is difficult to degrade under natural conditions. Long-term accumulation not only occupies land, breeds mosquitoes, but also easily causes fires and pollutes the environment. It is a typical black pollution source. At present, the processing methods of waste tires mainly include: (1) original shape utilization, which is used for wharf guardrails, river and sea dams, amusement facilities, etc., but the processing volume is extremely small (2) tire retreading, which requires high requirements for waste...

AI Technical Summary

Problems solved by technology

However, the current pyrolysis process has problems such as high pyrolysis temperature, high energy consumption, high yield of pyrolysis gas, and inability to continue production.

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