二次能源的开发利用已引起人们极大的关注。近年来国外许多国家对冶金炉渣余热的回收利用作了大量研究工作,取得了一定的成绩,有的已成功地应用于生产和生活。据报道,一个钢铁工业发达的国家,每年产生的高炉渣达千万吨。如日本为2,700万吨,法国1,500万吨,西德1,700万吨。高 The development and utilization of secondary energy has caused great concern. In recent years, many foreign countries made a great deal of research work on the recovery and utilization of metallurgical slag waste heat, and achieved some success. Some have been successfully applied to production and life. It is reported that a country with a developed iron and steel industry generates 10 million tons of blast furnace slag each year. Such as Japan is 27 million tons, France 15 million tons, West Germany 17 million tons. high