Hemijska industrija 2011 Volume 65, Issue 1, Pages: 43-51
https://doi.org/10.2298/HEMIND100716058S
Full text ( 406 KB)
The effects of colloidal SiO2 and inhibitor on the solid deposit formation in geothermal water of low hardness
Stanković Novica J.
Purenović Milovan M.
Ranđelović Marjan S.
Purenović Jelena M.
Low solubility of SiO2 and its occurrence in geothermal waters in the form of
ionic, colloidal and suspended state are the main cause of the solid deposit
occurrence. Certain chemical types of silica, under the influence of Fe2+,
Al3+, F−, OH- ions and other micro-constituents, and due to significantly
decreased solubility of SiO2, stimulate nucleation, particle growth and solid
deposit formation. The aim of this paper is to inhibit the process of
nucleation and solid deposit formation by adding originally designed
inhibitor in the form of an emulsion, when the total concentration of the
present and added colloidal SiO2 is beyond the solubility limit (120 mg/dm3).
By turbidimetric, SEM, EDS and XRD analysis, the processes of solid deposit
formation were investigated in Vranjska Banja (Serbia) spa geothermal water
source (water hardness of 4ºdH), and theoretical and practical conclusions
were made.
Keywords: colloidal SiO2, incrustation, solid deposits, nucleation, hydration
More data about this article available through SCIndeks