日本加古川钢铁厂240吨顶底复吹转炉(LD-OTB)原使用Ar和N_2作底吹气体。最近,该厂已采用气液吸收法(科斯夫法)从转炉废气中分离出高纯度CO,用作转炉的底吹气体,获得与Ar相等的精炼效果。 1.底吹气体的种类与选择能代替Ar作底吹气体的有N_2、CO_2和CO等。但是,使用N_2会使钢水终点〔N〕含量升高;使用CO_2则使耐火砖喷嘴耗损速度加快。使用CO时,对钢水质量和耐火材料的影响与使用Ar时相同。然而,迄今尚无大量生产CO的装置。但CO与其它惰性气体比较起来,对漏气引起的安全问题更应考虑得 Japan’s Kakogawa Steel 240 tons of top and bottom blowing converter (LD-OTB) original use of Ar and N_2 as the bottom blowing gas. Recently, the plant has adopted the gas-liquid absorption method (Coffs method) to separate high-purity CO from the converter off-gas and use it as a bottom blowing gas for the converter, achieving the same refining effect as Ar. 1. The type and choice of bottom blowing gas can replace Ar for bottom blowing gas with N_2, CO_2 and CO. However, the use of N_2 will make the molten steel end point [N] content increased; the use of CO_2 make refractory brick nozzle wear and tear faster. The effect of using CO on molten steel quality and refractory properties is the same as with Ar. However, so far no mass production of CO devices. However, CO and other inert gases, the safety issues caused by leakage should be considered