Conclusion
It is hoped, in conclusion, that the practical experience with the tube digester proves:
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1.
There is not waiting time required for extraction, and it is sufficient to heat pulp to the temperature proper to the bauxite.
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2.
The sojourn time can be reduced to 150 sec to this end.
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3.
The tube digester, in many respects, has a better duration function than the autoclave series with corresponding consequences for the transmutation.
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4.
The desilication is complete.
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5.
The quartz does not appear to be more attacked than in autoclaves.
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6.
The settling behavior of the red mud is often much better than low temperature red mud.
It is believed that this new principle shows considerable promise for the future.
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Bielfeldt, K. Practical experiences with the tube digester. JOM 20, 48–54 (1968). https://doi.org/10.1007/BF03378745
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DOI: https://doi.org/10.1007/BF03378745