CCCCV.—The influence of alkalis on the coagulation of silica and clay suspensions by alkali chlorides

Oakley, Henry Bowen

doi:10.1039/jr9270003054

Cited by 2 publications

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“…He showed that the possibility of the formation of a weakly soluble salt was an essential part of the phenomenon. This result is apparently in contradiction to some results obtained by Gedroiz (1915) and Oakley (1926). Oakley claims that a mixture of sodium chloride and sodium hydroxide flocculates a clay suspension analogously to a mixture of calcium chloride and calcium hydroxide, but his published figures, given in the following table, show that the flocculation is not more rapid than the coagulation, so the particular effect under consideration here did not occur.…”

Section: The Coagulation Of Clays In Alkaline Mediacontrasting

confidence: 82%

“…As examples, the data of Bradfield (1923Bradfield ( , 1925Bradfield ( , 1928, Oakley (1927), and Mattson (1929) have been discussed on these lines in detail in Keen's monograph. But there is one set of results whose interpretation is still uncertain, namely those classified in the monograph under the name of the second type of anomalous flocculation of clay suspension.…”

Section: The Coagulation Of Clays In Alkaline Mediamentioning

confidence: 97%

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The present position of the theory of the coagulation of dilute clay suspensions A résumé.

Russell

1932

J. Agric. Sci.

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In this paper the general theory of the coagulation of dilute clay suspensions is discussed. The more important of the points considered are summarised below.1. Two separate mechanisms causing collisions between suspended particles are considered, namely their Brownian motion and the mass motion of one group of particles relative to another group. Following Wiegner, these two types of collision are called perikinetic and orthokinetic collisions respectively. The rate of coagulation of a suspension is then shown to depend on the rate of collisions between particles and on the probability of adhesion between them when they collide. If this probability is unity, that is if every collision between two particles results in their adhesion, the suspension is undergoing rapid coagulation. There is excellent agreement between theory and experiment for this type of coagulation whenever the mathematical equations involved can be solved. But if the probability of adhesion is less than unity, the suspension is undergoing slow coagulation, and there is as yet no theory capable of giving the rate of coagulation of such a system.

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Section: The Coagulation Of Clays In Alkaline Mediacontrasting

confidence: 82%