Composition of phosphates formed by the interaction of liquid glass with orthophosphoric acid solutions
| Autor: | Sumich, A. I., Eshchenko, L. S. |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: | |
| Popis: | The chemical and phase composition of products formed by interaction of liquid glass with 20– 80% H3PO4is investigated. It is shown that the products of the synthesis include hydrated silicon and phosphorus containing phases. The silicon containing phase is a mixture of amorphous silica gel and nonstoichiometric sodium silicates. The phosphorus containing phase is sodium hydrophosphate Na2HPO4· 12H2O. It is established that the crystalline phase is formed irrespective of a mixing method and acid concentration. It is suggested that the cause of formation of acid salt of phosphoric acid even at a large excess of water glass is replacement of protons H + of silanol ?Si-OH-groups of silicic acid by cations of Na + and formation of sodium silicates which act as a connecting bridge between adjacent globules of the formed hydrogel. |
| Databáze: | OpenAIRE |
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