Technologic Study On The Production Of Different Kinds Of Coke By Adding Waste Plastics In Blended Coal

In order to use waste plastics resource effectively, it was carried out to study thefeasibility in the coking conditions on producing metallurgical coke and high strengthporous coke by adding waste plastics in this paper. The blended coal and mixed wasteplastics were used in the co-carbonization process. The effect of waste plasticsparticle size, pyrolysis rate, coke final temperature and holding time on the cokequality were investigated, meanwhile, using conventional coking technology to dealwith waste plastics. Metallurgical coke and high-strength porous coke were made byadding different proportions of mixed waste plastics into basis blended coal. The mainconclusions are below.It was bad for coke blowhole structure, coke microstructure strength and cokereactivity index by adding waste plastics into coking. The smaller the plastics particlesize added, the smaller the coke property affected through co-carbonization. In orderto stabilize the waste plastics nature, it is necessary to use mixed plastic whilecontrolling the residual rate of plastics more than70%at20min carbonized time at450℃. The cokingtechnology parameters were obtained through experiment:5℃/minpyrolysis rate,180min holding time,1050℃coking final temperature.It was suggested that it is necessary to add3%~6%waste plastics into coal forco-carbonization to produce metallurgical coke, through adding a binder, molding andwaste plastics deploy three ways to inhibit the coke quality decline. When the addedamount of waste plastics is4%, the I drum value of coke is85.28%, the cokereactivity of coke is31.56%, the coke can reach the standard of metallurgical coke.With producing porous coke as target, two ways are carried out: adding mixedwaste plastics10%~20%in bulking and12%~25%in molding with coal to get porouscoke which I drum strength both greater than60%, the coke reactivity up to50%.Compared with conventional coke, the porous coke has less microscopic pores andmore large pores with the specific surface area increasing from3.5to6.9m2/g.The above results showed that it could be feasible to produce differentspecifications coke by means of adding waste plastics into blended coal, but theoptimal coking condition need to be enlarged experimental verification.