Technical improvement of making rotary tube furnace, tetrode reduction furnace in recent years is described.

介绍了近年来在制作回转管炉、四管还原炉的技术进步；

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In addition to the both ends of the rotary furnace tube sealing measures taken, so in the use of the process can also pass into the oxidation, reduction and other necessary atmosphere.

另外旋转炉管的两端采取了密封措施，所以在使用过程中还可以通入氧化、还原等必要的气氛。

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