| The rapid increase of economic society has been accompanied worldwide by a major generation of waste rubber.The "black pollution"caused by waste tires has become increasingly serious.Pyrolysis,as an environmentally-friendly solid waste treatment method,achieving the green and efficient recycling of waste tires.It is also a significant approach to reduce environmental pollution and ease the shortage of resources in China.There are two parts in this paper:The first part aims to study the properties of pyrolytic carbon black and the performance of SBR reinforced by CBp.The second part carried out a preliminary investigation of the thermal energy reuse of waste rubber,analyzed the direct combustion of waste tires and the power generation applications of thermal cracking products.The goal of this paper is to build an ecological and economical circular economy model.In the first part,we analyzed the structure and properties of CBp,in comparison with a series of commercial carbon blacks such as N330.Firstly,in the aspect of particle size:CBp is a mixture of carbon blacks derived from tires,with various particle,irregular shape,and the aggregates of its particle is larger than N330.In addition,the BET surface area of CBp also has a certain gap with N330,while the bulk characterization of carbon black did not change much during the pyrolysis process.Secondly,we discovered that compared with N330,the adsorption number of CBP is lower and the ash content is higher,which is a significant feature of CBp.Finally,we studied the surface chemical properties of CBp,and found that the surface chemical properties of CBp had changed significantly.Its surface active functional groups were lost because of the high temperature during the pyrolysis process.Meanwhile,a certain number of active sites were covered,due to the formation of carbonaceous deposits and ashes,which is another important feature of CBp.And then we studied the performance of SBR which was reinforced by CBp.The results showed that the cure time was significantly shortened.At the same time,with the increase in the amount of CBp,the mechanical properties of SBR were improved.However,compared with SBR filled with N330 or N660,the performance of SBR filled with CBp still had a big gap,which was closer to N774.This is caused by the properties of CBp.Meanwhile,in the rubber matrix,CBp formed a separate continuous phase structure,with poor dispersion performance.As a result,CBp is no longer used as rubber reinforcing agent.In the second part,we detailed analyzed the energy utilization of scrap tires.First of all,we studied the application of waste tires direct combustion.The results showed that even though the power generation using waste rubber was the most simple method to deal with these wastes,however,if the disposal weren’t done properly,it would cause great pollution to the environment.Using waste tires in the cement production process would be a reasonable way,but it also exists obvious flaws.Secondly,we emphatically introduced the pyrolysis process of scrap tires.We found that pyrolysis is a potential method for treating waste tires,however,the most important factor that restricts the development of cracking is that the application value of pyrolysis products is not high.Therefore,in order to achieve high value of waste tires,we studied the pyrolysis products of waste tires for the power generation strategy of tire plant.The results showed that this strategy was a cost-effective way to tackle with waste tires.It made the process of production and processing of tires integrated,so the recycling of waste resources was achieved.It is a positive factor to improve the energy structure of the modern tire plant,in accordance with the circular economy mode of modern society. |
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