Читать книгу Henley's Formulas, Recipes and Processes (Applied Chemistry) - Various - Страница 76
Acid-Proof Cement for Wood, Metals, etc.—
Оглавление| I.— | Powdered asbestos | 2 parts |
|---|---|---|
| Ground baryta | 1 part | |
| Sodium water-glass solution | 2 parts | |
| Mix. | ||
| II.—To withstand hot nitric acid the following is used: | ||
| Sodium water-glass solution | 2 parts | |
| Sand | 1 part | |
| Asbestos | 1 part | |
| Mix. | ||
| III.— | Asbestos | 2 parts |
| Sulphate of barium | 3 parts | |
| Silicate of sodium | 2 parts | |
| By mixing these ingredients a cement strong enough to resist the strongest nitric acid will be obtained. | ||
| IV.—If hot acids are dealt with, the following mixture will be found to possess still more resistant powers: | ||
| Silicate of sodium (50° Baumé) | 2 parts | |
| Fine sand | 1 part | |
| Asbestos | 1 part |
Both these cements take a few hours to set. If the cement is wanted to set at once, use silicate of potassium, instead of silicate of sodium. This mixture will be instantly effective and possesses the same power of resistance as the other.
