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Precipitate flotation: A preliminary study of the underlying mechanism
Author(s) -
Kalman K. S.,
Ratcliff G. A.
Publication year - 1971
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450490513
Subject(s) - pulmonary surfactant , dodecylbenzene , adsorption , froth flotation , magnesium , particle (ecology) , bubble , chemistry , range (aeronautics) , materials science , analytical chemistry (journal) , chemical engineering , inorganic chemistry , sodium , chromatography , metallurgy , sulfonate , composite material , physics , biochemistry , oceanography , mechanics , engineering , geology
Precipitate flotation has been investigated in a continuous steady‐state unit using magnesium hydroxide suspensions (con centration range 2‐28 × 10 −4 g‐mole/l) and sodium dodecylbenzene sulphonate as surfactant (concentration range 1.5. 10 × 10 −5 g‐mole/l) at a pH of 11.75. Experimental results indicate essentially instantaneous equilibrium of the surfactant at the bubble‐liquid interface, and a substantial adsorption of surfactant on the metal hydroxide particles. The latter adsorption affects particle removal. Electron microscopy and photography have been employed to determine the sizes of the particles and bubbles respectively. A model is proposed based on collisions between the particles and the bubbles. It allows for the coverage of surfactant on the particles and the available area for particles to adsorb on the bubbles. Tests of the model with data from continuous operation show an average deviation from experiment of under 10%.