平炉采用氧气顶吹以后,熔炼时间虽然大幅度缩短,但前四道工序(补炉、装料、加热、兑铁水)时间变化不大,平均仍在2小时以上,占总熔时的35％左右。为进一步发挥氧气顶吹的生产潜力,于1974年11月和1975年3月先后进行了两次废钢—氧气法试验,初步取得了一些效果,摸到了一些规律。现将试验情况简单介绍如下: Although the blast furnace time was greatly shortened after oxygen top blowing, the time of the first four processes (filling furnace, loading, heating, and hot metal) did not change much. The average time was still over 2 hours, accounting for 35% of the total melting time. about. In order to further develop the production potential of oxygen top blowing, two scrap-oxygen tests were conducted successively in November 1974 and March 1975, with some preliminary results and some regularities touched. Now the test situation is as follows: