我厂在未建鼓风竖窑前是用自然通风竖窑煆烧硬质粘土,在倒焰窑内煆烧高铝矾土。但前者温度低、效率不高,后者又极不经济,因此在1955年初建立了两座19M~3的鼓风竖窑(见图1)煆烧硬质粘土,1957年又开始煆烧高铝矾土。开始生产的一年中,窑况不稳定,产量低。自1956年开始进行了一系列试验如薄层装料、严格操作、正确掌握焦比、提高风压、 I plant in the blast furnace before the shaft is built with natural ventilation shaft kiln burning hard clay, burning in the inverted flame kiln bauxite. However, the former had low temperature and low efficiency, and the latter was extremely uneconomical. Therefore, two 19m ~ 3 blast-kilns (see Figure 1) were built in early 1955, and hard clay was burned again and burned again in 1957 Bauxite In the first year of production, the kiln status is unstable and the output is low. Since 1956, a series of tests have been carried out such as thin-layer charging, rigorous operation, accurate control of coke ratio, increase of wind pressure,