To fully utilize a waste toner as an energy source without providing an extra equipment by mixing a waste toner with a coal- or petroleum-derived heavy oil component, feeding the mixture together with a coal feed into a coke oven and heat-decomposing the waste toner.
The essence consists in the facilitation of the handleability of a very fine waste toner by mixing the toner with a coal or petroleum-derived heavy oil component to form a slurry so as to prevent the dusting of the toner and to prevent a risk of the dust explosion of the toner and not healthy working environment due to dusting in subsequent operations. This slurry together with a coal feed is fed into a coke oven and heated to effect the heat decomposition of the toner into a gas mainly consisting of hydrocarbons and H2. This gas together with the coke oven gas is recovered, passed through a gas purification step, and supplied for uses such as a material for synthesis or a fuel. The heavy oil component mixed with the waste toner is exemplified by coal tar, tar residue, asphalt, or heavy oil.
TAWARA TSUTOMU
ISHIGURO HIROKI
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