| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce iron making dust contg. zinc at a high temp. by using coal and oxygen to separate this dust from iron, further, to prevent oxidation at the time of cooling, to recover metallic zinc, to recover the formed gases and to use these gases as fuel and chemical raw materials. SOLUTION: Coal 1 and oxygen 4 are added to the iron making dust 2 contg. iron oxide, zinc oxide, etc., in a reaction furnace and the iron and zinc are separated from the iron making dust by the gasification of the coal, the reduction of the iron oxide and zinc oxide and the evaporation of the reduced zinc in the gases at a temp. above a temp. at which the mixture composed of the iron and the ash-content in the coal melts. The reaction furnace 5 is provided with a shaft furnace 7 packed with coke 8 at the poststage of the same and the gases and metal zinc vapor discharged from the reaction furnace 5 are passed therein to effect the reaction of the gases and the coke 8, by which the lowering of the temp. of the gases and the conversion of the gaseous compsn. are executed. Further, the slag and dust in the gases are captured, by which the metal zinc having the high purity is recovered.</p> |
