Yazar "SARIKAYA, M" seçeneğine göre listele
Listeleniyor 1 - 2 / 2
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe FLOTATION CHARACTERISTICS OF OXIDIZED COAL(Butterworth-Heinemann Ltd, 1995) SARIKAYA, M; OZBAYOGLU, GThe floatability of oxidized coal was investigated by means of electrokinetic studies, contact angle measurements and flotation tests. Electrokinetic measurements showed that the zeta potential of unoxidized and oxidized coal samples depends on pH. Hydroxonium and hydroxyl ions are potentially significant ions, both for oxidized and unoxidized coal. Increasing oxidation times decreased the measured iso-electric points and increased the negative zeta potential. In the presence of cationic collectors the negative value of the zeta potential for oxidized coal was changed to a positive value below pH 9.3-10.9 depending on the type and concentration of collector used. Contact angle measurements indicated that the natural flotability of unoxidized coal was found to deteriorate on oxidation. Addition of cationic collectors increased the value of the contact angle of oxidized coal. Flotation tests showed that as the degree of oxidation increases. the floatability of coal decreases. Cationic collectors were found to be effective in the flotation of oxidized coal.Öğe FLOTATION TEST AS A METHOD FOR STUDYING COAL WEATHERING(Elsevier Science Bv, 1995) SARIKAYA, MThe effects of oxidation on flotation recovery of oxidation at 20 degrees C, 50 degrees C and 100 degrees C for periods up to 100 hours were investigated using an alcohol type frother. The recovery of the floated coal decreased from 95 percent to 24 percent after oxidation. As a result of measurements with a low-ash bituminous coal, flotation is suggested as a method of investigating the initial stages of oxidation of coal particles.
