Method for preparing rubber powder by desulfurizing waste tires at low temperature through ammonia method

Abstract

The invention relates to the technical field of low-temperature desulfurization for waste tires, in particular to a method for preparing rubber powder by desulfurizing the waste tires at low temperature through an ammonia method. The method includes the steps that after the waste tires are cut into blocks, magnetic separation, grinding, magnetic separation and grinding are carried out on the blocks to obtain powder of 80-100 meshes; the powder is treated through a circulating fluidized bed treater, ammonia gas is introduced, ammonia gas introducing speed and time are controlled, the catalytic action of microwave radiation is combined, S-S bonds and S-C bonds in the waste tires are activated by the ammonia gas, bond energy is reduced, the fracture rate is increased, and the sulfur component in the waste tires is removed. As the method for recovering and preparing the waste tires into the rubber powder is low in cost and energy consumption, the desulfurizing step can be carried out in a low-temperature environment, the high quality of the rubber powder is ensured, and the quality of rubber powder prepared by recovering the waste tires is improved.

Description

technical field [0001] The invention relates to the technical field of low-temperature desulfurization of waste tires, in particular to a method for preparing rubber powder from waste tires through ammonia-based low-temperature desulfurization. Background technique [0002] With the continuous development of the automobile industry, more than 80 million tires are scrapped each year, which poses a serious threat to the environment. In order to solve the threat of waste tires to the environment and the waste of rubber resources, a large number of researchers have recycled waste tires to produce rubber powder, or recycled waste tires to produce fuel oil or carbon black. A large amount of sulfur components, no matter in the preparation of rubber powder or carbon black, need to remove the sulfur components in order to make the performance and quality of the product meet the requirements, and then to promote The re-application and expanded application of the prepared rubber powde...

AI Technical Summary

Problems solved by technology

[0003] However, the sulfur components in waste tires mainly exist as S-S bonds or S-C bonds, which makes it difficult to remove sulfur from waste tires. The daily technology is to crack waste tires in high temperature environment or vacuum treatment in high temperature environment to obtain This not only causes the sulfur components after desulfurization to volatilize into the environment, causing secondary pollution to the environment, but also makes the removal of sulfur consume a lot of energy, and also breaks other beneficial bonds in waste tires, affecting The quality of the prepared rubber powder or carbon black results in poor quality rubber powder and high energy consumption