在过去的十年中,用密闭鼓风炉方法(指“帝国熔炼法”)生产铜、铅、锌,已达到可观的程度。现在已有十一个工厂用这种方法进行生产,並且至少有三个工厂在设计与建设阶段。表1是1970年中,现有11个生产炉的一些情况。此外,表中列出这些鼓风炉的所在地点,所属公司,开炉日期,典型烧结块的成 In the past decade, the production of copper, lead and zinc by the closed blast furnace method (referred to as the “Imperial Melting Law”) has reached a considerable degree. Eleven plants are now produced in this way and at least three plants are in the design and construction phase. Table 1 shows some cases of existing 11 production furnaces in mid-1970. In addition, the table lists the location of these blast furnaces, their companies, the opening date, the typical sintered block into