水酸化알루미늄·겔의 Grain Size와 制酸度에 關한 硏究 = Studies on the Grain Size and Acid-consuming Capacity of Aluminium-Hydroxide Gel

다국어 초록 (Multilingual Abstract)

The studies on the change of acid-consuming capasity of aluminium hydroxide with time dependence have been reported about the crystallization of aluminium hydroxide gel. However, the relationship between grain sizes (particle sizes) and the acid-consuming capacity of dried aluminium hydroxide gel has not been studied. And studies on the grain sizes of dried aluminium hydroxide gel qualified by The Pharmacopeia of Korea has not been reported.
For the purpose of studying these problems, the author prepared two-kinds of dried aluminium hydroxide gel with different methods as follows,
Na_(2) O.Al_(2)O_(3)+CO_(2)------->AI(OH)_(3)……sample 1
Al_(2)(SO_(4))_(3)+6NaHC0_(3)-->AI(OH)_(3)……sample 2
that method 1, to add carbon dioxide through the sodium aluminate and method 2, to add the sodium bicarbonate to alumium sulfate solution.
Both of sample 1 and 2 are found as an amorphous by X-ray diffraction method, and their acid-consuming capacities were determined by the method of The Pharmacopeia of Korea.
At the same time the grain sizes were measured by X-ray diffraction method and the particle sizes were observed by electron microscopy.
The change of acid-consuming capasites, grain sizes and particle sizes of these sample 1 and 2 with time dependence are studied in the same methods of each, which is described as above.
The result of these studies are summerized as follows:
1. The grain sizes were linearly enlarged as the time goes by.
The amorphous state of aluminium hydroxide gel invert to crystallization by sixty days.
2. The acid consuming capacity was changed likely in an exponential decreasing curve, decreased as the sizes of them grain sizes of them enlarged.
3. One particle of dried aluminium hydroxide gel consists of tens of grains.
4. Grinding the sample obtaned in any period of testing time in mortar did not change both of those grain sizes and of those acid-consuming capacities.
5. It is found that the main factor of acid consuming capacity of dried aluminium hydroxide gel prepared by regardless of any methods, is the size of grains.
In this point of view the grain sized of dried aluminium hydroxide gel ought to be micronized less than 100Å for maintaining the ability such as consumes 250ml of 0.1N HCI solution per 1g of dried aluminium hydroxide gel which is described in the pharmacopeias.

목차 (Table of Contents)

• Abstract
• I. 緖論
• II. 實驗 및 考察
• III. 結論
• 參考文獻