THE STUDY OF THE PRECIPITATE FORMATION PROCESS IN SILICATE-ALKALI MIXTURE IN THE PRESENCE OF SALT WATER
Journal Title: Вісник Національного Авіаційного Університету - Year 2018, Vol 75, Issue 2
Abstract
Purpose: The aim of this article is investigation of th e precipitation process when diluting silicate solution with salt water. The precipitation pr ocess changes have been analyzed with pH value increasing of the initial silicate-alkali mixture. Methods: Methods of direct and reverse titration were used for the determination of silicate relative concentration in the supernatant liqui d. pH metrics was used for determination pH value change of silicate-alkali mixtures during experiment performance. Results: the precipitation process proceeds more intensively when ratio of silicate and salt water is 40 ÷ 60; the precipitate amount consistently decreases with pH va lue increase in initial mixture in th e result of mixing with salt water; necessary residue concentration of silicate in a solutio n should be 1.5-2 mass % for a gel formation process; the most significant changes of mixture pH valu es occurs when salt wate r content is above 50 %. Discussion: It is necessary to determine silicate concentr ation in the supernatant liquid (filtrate) for the determination minimal silicate concentration necessary for gel formation when mixing silicate mixtures with salt water. It was determined that silicate amount in the supernatant liquid increases for all ratios of silicate and salt water with pH value increase in the initial mixtu re, besides it is necessary to increase part of salt water in a mixture with pH value in crease for obtaining the same concentra tion of silicate in the supernatant liquid. It was found, that gel form ation (for a mixture with initial pH = 11.72) occurred at silicate residue concentration in the solution equal to 0.25-0.3 from the initial one. Thus, it was found that minimal silicate concentration in a solution may be 1.5-2.0 mass %.
Authors and Affiliations
Оlga Titova, Natalia Stoliarova, Zoia Hrushak, Tetiana Kravchuk
Keywords
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- EP ID EP510238
- DOI 10.18372/2306-1472.75.13121
- Views 107
- Downloads 0
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