Steelmaking Mechanisms for a Tatara Furnace and New Ironmaking

为了探索新的炼铁工艺，对日本传统炼铁工艺--“塔塔拉炼钢”的机理进行了研究。(1)建造了紧凑型“塔塔拉炉”，用于生产钢坯和生铁。(2)共运行14次。(3)利用热电偶和氧传感器对炼铁和炼钢过程中的温度和氧势进行监测。此外，还对钢、生铁和炉渣进行了化学成分分析。(4)对冬季作业4次的常规“塔塔拉”的作业方式进行了研究。(5)通过以上研究，得出以下结论：塔塔拉炼钢的特点是在1350℃左右的低温和1×10~(-12)atm左右的高氧势下快速加热反应。钢坯和生铁中碳含量分别约为1.5%和3.5%左右，硅含量几乎为微量。这表明塔塔拉的炼铁反应不处于热力学平衡状态。(6)为了开发一种新的炼铁工艺，在快速加热和反应的条件下，考察了由铁矿石和煤组成的球团矿在1350℃下8分钟内生产生铁的情况。

The mechanisms of "Tatara Steelmaking" which was a Japanese traditional ironmaking process has been investigated and studied for a new ironmaking process. (1) The compact "Tatara Furnaces" for making steel blooms or liquid pig iron was constructed and (2) 14 runs were carried out. (3) Temperature and oxygen potential were monitored during ironmaking and steelmaking by thermocouole and oxygen sensor. Also, the composition of steels, pig irons and slags were chemically analyzed. (4) The conventional "Tatara" which is operated 4 times in winter season has been studied on its operation way. (5) From above studies, the following results were obtained; The characteristics of "Tatara" steelmaking is the operation at low temperature of about 1350℃ and high oxygen potential of about 1x10^<-12>atm under rapid heating and reaction. The carbon contents in steel bloom and pig iron are about 1.5% and about 3.5%, respectively and the silicon content is almost trace. This indicates that the ironmaking reaction in "Tatara" is not in thermodynamic equilibrium. (6) Then, for developing a new ironmaking process, a pellet composed of iron ore and coal was examined for producing liquid pig iron at 1350℃ during 8 minutes under rapid heating and reaction.