| Title | Experiments on Silica Sols Production from Hydrothermal Solutions by Membrane Filters |
|---|---|
| Authors | Potapov V.V., Gorbach V.A., Sulga O.V., Sadovnikova A.O., Min G.M., Kashutina I.A. |
| Year | 2005 |
| Conference | International Mineral Extraction Conference |
| Keywords | |
| Abstract | The experiments on concentration of hydrothermal solutions by membrane filters for silica sols production were carried out. Three types of membranes were tested. The first type was ceramic membrane filters with diameters of pores 0.1-0.3 ìm and average pores diameter 0.2 ìm. The second type was filters with pores sizes in the range of ultrafiltration – 0.01-0.001 ìm. The third one was filter with reverse osmosis membrane with diameters of pores in the range 0.001-0.0001 ìm. Addition of coagulant aluminium sulphate was used in the experiments with ceramic filters. Temperature of solution varied from 20 to 90 0C, mass rate of filtrate through membrane filter was from 5 to 1200 liters per hour. Cations Al3+ were used in the experiments with ceramic filters prior filtration for colloidal silica particles aggregation. No cations were added in the experiments with ultrafiltration and reverse osmosis. Selectivity of membrane layers with respect to colloidal silica particles and molecules of orthosilicic acid was determined in the experiments. Concentrated silica sols with SiO2 content from 5 up to 150 g/liter were obtained in our experiments by ultrafiltration and reverse osmosis. Silica sols can be utililized in the chemical industry, for example, for production of catalysts, ceramics and zeolites. |