Abstract
Operating conditions of cupola by low grade coke and properties of molten metal were investigated. Results obtained were summarized as follows: (1) The temperature of molten metal is rised with increasing of charge coke ratio and blast volume. (2) CO2% in gases taken at the top of cupola is lowered when the temperature of molten metal is higher. (3) The position of melting zone is lowered to CO2 rich atmosphere and the molten metal is more oxidized on the condition of too low height of bed coke and low charge coke ratio or too much blast volume. (4) The melting velocity increases with increasing of blast volume and diecreases with increasing of charge coke ratio. (5) The best operating condition by our low grade coke was concluded as follows; (a) Height of bed coke on tuyere level; same as internal diameter of cupola, (b) charge coke ratio; 16, 15 or 14% respected to the capacity of cupola 1/2, 3 or 5 ton. (c) Blast volume; 11, 55 or 80 m3/min. respected to the capacity of cupola 1/2, 3 or 5 ton.
