COLLOIDAL- AND CHEMICAL CONSISTENCIES OF FLOTATION-WITH-CARRIER WATER CLEANING FROM CHROME VI IONS
Journal Title: Вісник Одеського національного університету. Хімія - Year 2015, Vol 20, Issue 4
Abstract
Size-consist and electrokinetic effects in heterogenic system generated by flotation-with-carrier water cleaning from Cr (VI) ions experimentally researched. Based on fundamental principles of DLVO Theory ascertained that effectiveness of flotation cleaning is determining by molecular attraction (Um) and electrostatic repulsion (Ui) forces balance between dispersion phase particles of test system. Approved that water can be definitely (98%) purified from Cr (VI) oxoanions (CrО42-) by flotation-with-carrier, which are previously precipitated with over equivalent amount of barium chloride (1.25 mole ВаCl2/ 1 mole К2CrО4) using as carrier a fine-dispersed paraffin (paraffin consumption is 6.31g/ 1 g BaCrO4). Determined that belaying of positive paraffin particles onto bubbles simplified by their negative charge. Total interaction energy (U = Um + Ui) between sublat particles (paraffin and barium chloride particle aggregate) and air bubbles is equal to zero upon optimal carrier consumption conditions. This points to the predominance of intermolecular attraction forces between converging particles of dispersion phase, which leads to their enlargement and as a consequence to more solid belaying onto air-bubbles surface and treated solution surface. Considering that electrolyte concentration with interaction energy hump between spherical particles is on the X-line (U = 0) and is critical, in other words causes quick disperse system coagulation; and the condition k∙Нс ≈ 2 must be met (where Нс is critical distance between particles). Computation of Нс value were performed for test flotation system: κ ∙Нс = 1,05∙106 cm-1 × 1,89∙10-6 cm = 1,99. Obtained result can lend evidence that in conditions of equal amounts of precipitator and chrome oxo anions, and optimal carrier consumption, each sublat particles collision with bubbles will lead__to heterocoagulation. Under precipitator consumption less than 1 mole ВаCl2/ 1 mole К2CrО4 Cr(VI) recovery ratio is not exceed 40%. In that case sublat and air bubbles interaction carries in sufficiently deep (-(40-50) kT) distal potential minimum. In such conditions remains the film of dispersion medium between bubble and particle, which promotes the detachment action forces of sublat particles from floating bubbles surface. Moreover in case of low precipitator consumption there is some excess amount of carrier particles which are not linked with extracted ion. In accordance with mentioned carrier particles will be extracted primarily. Under highest than optimal precipitator consumption the potential of sublat particles raising is observed, and as consequence the ion-electrostatic barrier of repulsion (Ui=10-20 kT) between them is observed. There is water layer between sublat particles remains in such conditions. This is showed by deep (over 100 kT) potential minimums on the curves. As a result on the solution surface there is crumbly coagulum visually observed, which is destroyed by floating bubbles and carried into treated solution volume due to air agitation.
Authors and Affiliations
V. V. Kostik, V. F. Sazonova, Vl. V. Kostik
Keywords
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- EP ID EP411630
- DOI 10.18524/2304-0947.2015.4(56).56694
- Views 41
- Downloads 0
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