1961 年 33 巻 12 号 p. 853-860
For a practical application of the water-cooled cupola, we have studied the continuous acid operation with midnight banking of fire, making a series of experiments on a 2 ton water-cooled cupola.
The results are as follows:-
1. It is very important in continuous operation to keeo it stable for a long time. The construction of the cupola, therefore, should be different from the usual one. The shell around the melting zone is to be lined with highly anti-corrosive refractories, and the tuyere should be designed as to send the blast to the centre of cupola, while the basin should be made as shallow as possible, in order to avoid the molten metal to be cooled and the slag may be easily cleaned out by the blast.
2. When the cupola is lined with high silicon carbide (SiC 80%, porosity 16%) refractory of 60mm thickness, a stable operation can be maintained for more than 30 hours or 6 days. The retractory proposed is neither oxidizable, nor corrodible. The effect of water-cooling makes the heat conductive refractory more endurable, while the inside of cupola is not so cooled by the endurable refractory.
3. The contents of slag are almost the same every day, and those of metal are also invariable in continuous operation particularly by applying high grade refractory mentioned above. The slag control is easy and better products are obtained.
4. The high silicon carbide refractory, though it costs obout 15 times of the usual one, never makes the melting cost more expensive, if the cupola operation is repeated at least two terms of 6 days.
5. The continuons operation is reasonably stabilized as above. So, after automatic ignition at the start continuous operation, will go on automatically with no difficulties.