[in Japanese]

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Discontineous actions of heated water on glasses A & B, so as to treat the glasses every 2hrs. after drying, weighing and titration for several times at 210°C on A glass and 100°C on B glass, are measured by surface method. Experimental results are obtained to show that the relation of cumulative weight loss (mg/cm²) to treating total time (hour) is linear but not the parabolic equation as mentioned in the previous report.
A theoritical consideration of these facts deduced that the swelled hydrosilicagel results on glass surface by the water action was shrinked by each drying irreversibly, therefore extraction of alkali from glass was followed at constant velocity.
Next experimences are performed to detect the changes of acting power of water with melting process of two glasses A & C, recognizing the irregular relation between weight decrease and melting hour.

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[in Japanese]

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(I) Diatomaceous earth is most used in Japan as a ceramic purposes, as heat insulation, in powdered state or bricks sawed to shape from the natural diatomaceous rock and pressed brick made from powdered earth, either calcined or natural. Also powdered diatomaceous earth is now used as an addition to concrete, a fiter-aid of raw cane sugar selutions, an absorbent and as a carrier for various catalyser. In spite of those major uses of diatomaceous earths in japan, no fundamental paper has been published on their properties from ceramic view point. Therefore the author have studied on physical and chemical properties of diatömaceous earth reffering to ceramic view point. These samples was collected by authers from numerous diatomite deposits at number of localities in japan. Their details will be given at continued reports.
(2) History of the uses of diatomaceous earth and numerous literatures on diatomaceae and diatomaceous eartn are described.
(3) Diatomaceous earth consists of numerable skeletons, namely of the fossil remains of unicellular plants called “diatomaceae”. These skeletons sank to the bottoms as to form the present great beds of piatomaceous earth. General explanations and literatures on diatomaceae, especially a condition of cell-division of it based upon the botanical point of view are given in this report.

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Author adopted such apparatus shown in 1st figure to research such following objects.
1. Effect of absorbing time, vacuum and filter cake moisture on the filterability.
2. Effect of rize of particle on filterability
3. Effect of mixing satio of raw materials on filterability
4. Effect of slurry moisture on the filterability
5. Effect of temperature on the filterability
6. Effect of slurry moisture and fineners on the viscostly of slurry.
7. Effect of filter aid on the filterability
From the results of many tests author reached to such conclusions.
1. To operate the fillration at the best condition we must carry out the following items.
a. more use of limestone and ganister and less clay. Replacement one part of raw clay by calcined.
b. use of the least slurry moisture as we can.
c. keeping the slurry temperature as high as we can but no operating at higher than 60°C as it is no efficient.
d. use of coarser particles so far as the burning becomes not so much difficult.
e. Quickest revolution of filter so far as the filter cake moisture no increase.
f. operation under the befitting vacuum pressure ss far as the filter cake cracks not too quickly.
2 When add cement dust to cement slurry the filterability and cake moisture increases. Increase of the cake moisture and % of dust added to raw mix is almost the same.
3. Filterability is the better when particle of lime stone is the greater. Slurry of clay, ganister and slag gives the best filterability respectively when fineness of clay is 98% pasr the no 70 sieve, ganister and slag 95%.
4. Viscosity of slurry is the less the more slurry moisture. It decreases as temperature becomes to higher and particles to greater. Increase of 15c. and 2% slurry water gives the same effect on the viocosity of slurry. Effect of fineness on the viscosity is by far the greater than the others.

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