Metallugical Characters on Coal-Bearing Pellets

The rates of the reduction of carbon-bearing pellets have been determined with a thermalbalance test instrument and heating method of a single pellet. The effects of heating temperature, carbon contents of pellet, composition of furnace gas, additives, and the kinds of raw materials on the rates of reduction, final metallizing rates and metallurgical characteristics of carbon-bearing pellets have also been investigated. The results of the experiments show that the softening temperature and melting temperature of the pellet are higher than coventional pellet's temperature. There is a procedure of gas-releasing when the pellets containing >15%C are heated in the temperature range of 1000℃ to 1350℃.The pellets can be self-reduced rapidly in the furnace gas with a high temperature and high contents of CO₂. A high metallizing ratio can be obtained. The final metallizing ratio of pelletes increases with the increase of heating temperature. This new type of pellet with very good metallurgical characters can be used directly as a raw material of ironmaking shaft furnace, in which coke can be replaced by a wide ranges of raw coals.