Method for preparing carbon black from pyrolysis coke of waste tire through molten salt heat treatment, and product prepared by using the same

Abstract

The invention belongs to the technical field of resourceful utilization of organic solid wastes, and specifically discloses a method for preparing carbon black from pyrolysis coke of a waste tire through molten salt heat treatment, and a product prepared by using the same. The method comprises the following steps: heating one or two selected from the group consisting of a metal chloride salt groupand a metal sulfate salt group so as to obtain molten salt; adding the pyrolysis coke of the waste tire into the molten salt, and carrying out molten salt heat treatment under a preset reaction atmosphere; and after completion of a reaction, separating a reaction product into secondary molten salt and treated pyrolysis coke, washing treated pyrolysis coke with hot water, carrying out drying so asto obtain the carbon black, and recycling the secondary molten salt at the same time. According to the invention, by utilization of the melting characteristic of the molten salt, impurity componentsin the pyrolysis coke of the waste tire are dissolved out, so the use of strong acids and strong alkalies like nitric acid, hydrochloric acid and an alkali liquor is avoided; meanwhile, through addition of metal chloride salt, the low-temperature melting characteristic of the molten salt is reinforced; and by utilization of metal sulfate salt, acidic gases like hydrogen sulfide and hydrogen chloride are captured in situ at the same time.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of organic solid waste, and more specifically relates to a method and a product for preparing carbon black by pyrolysis coke of waste tires through molten salt heat treatment. Background technique [0002] With the sharp increase in the number of private cars and the acceleration of replacement, the generation of waste tires in my country has also increased sharply. Statistics show that in 2017 alone, my country produced more than 300 million waste tires with a weight of more than 11 million tons, ranking first in the world. The storage of waste tires will occupy a large amount of land resources, and unreasonable disposal methods will cause serious resource and environmental problems. Therefore, it is of great significance to do a good job in the recycling of waste tires. Heat treatment technology can effectively recover resources and energy while achieving rapid volume reduction and...

AI Technical Summary

Problems solved by technology

CN109096798A discloses a micro-oxidation activation method for pyrolytic carbon black from waste tires. This method removes most of the volatiles and carbonaceous deposits accumulated on the surface of pyrolytic carbon black through a micro-oxidation process, but it cannot remove the pyrolysis coke. Inorganic sulfur, calcium, silicon and other impurity components

CN102504619B discloses a waste tire pyrolysis carbon black purification process, which reduces the content of ash and volatile matter by repeated acid and alkali washing of pyrolysis carbon black, and improves its rubber reinforcement performance; CN107379322A discloses a tire pyrolysis carbon black cycle The utilization method is to remove impurities and purify waste tire pyrolysis carbon black, and then make special carbon black for tires after modification process, which is used to manufacture new tires. A large amount of nitric acid or hydrochloric acid solution is generally used in the pickling process, and a large amount of acid gas such as carbon dioxide, hydrogen sulfide, etc. will be generated during the pickling process, which may easily cause environmental pollution.

Images