USE OF WASTE LUBRICANT OIL FROM STEEL ROLLING-MILLS IN THE COKING PROCESS

The main objectives of this research have been to study the possibilit ies of using residual oils from the steel rolling-mill process as an a dditive in a coal blend to be carbonized in a coke oven plant and, con sequently, to reduce the cost of coking blends. This type of residual oils is classified as a hazardous material difficult to get rid of. Pr evious to the addition to a coking blend, waste oil from the rolling-m ill process (tinnol) was treated to remove iron dust materials and red uce water content. Afterwards it was added to coking charges, using an installation specially designed for heating, transport and the pulver ization of such oils. The influence of these oil additions on the coki ng process and coke quality has been studied, using the 250 kg movable wall and the 6 t ovens of the INCAR Experimental Coking Test Plant. A possible method of recycling these waste oils within the coking proce ss has been found, backed by tests carried out to pilot and semi-indus trial scale.