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VIII.—The Stability of Suspensions. I. The Rate of Sedimentation of Kaolin Suspensions by Salts at Varying Hydrogen Ion Concentrations

Published online by Cambridge University Press:  15 September 2014

William Ogilvy Kermack  and
William Turner Horace Williamson
William Ogilvy Kermack
Affiliation:
The Laboratory of the Royal College of Physicians, Edinburgh, and the Edinburgh and East of Scotland College of Agriculture
William Turner Horace Williamson
Affiliation:
The Laboratory of the Royal College of Physicians, Edinburgh, and the Edinburgh and East of Scotland College of Agriculture
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Summary

1. The rates of sedimentation of a kaolin suspension in presence of varying concentrations of a salt (sodium chloride, potassium chloride, sodium sulphate, di-sodium hydrogen phosphate, sodium citrate, calcium chloride, calcium sulphate, monocalcium phosphate, “superphosphate”, aluminium chloride, ferric chloride or lanthanum chloride) have been compared at various pH values. Abnormal results are obtained with sodium chloride, monocalcium phosphate, aluminium, ferric and lanthanum chlorides.

2. Sodium chloride increases the rate of sedimentation in alkaline solution, but actually inhibits it in acid solution.

3. In concentrations of monocalcium phosphate above 0·06 per cent, abnormal sedimentation in alkaline solution takes place, with the result that it is much more complete than at the corresponding concentrations in acid solution.

4. In acid solution the tervalent ions, aluminium, ferric and lanthanum have little effect, but a zone of very marked flocculation occurs at pH 7–8. This zone separates a region within which the unsedimented particles are negatively charged from a region within which they are positively charged.

Type
Proceedings
Information
Proceedings of the Royal Society of Edinburgh , Volume 45 , Issue 1 , 1926 , pp. 59 - 70
Copyright
Copyright © Royal Society of Edinburgh 1926

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References

REFERENCES

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Kermack, and Voge, (1925), Proc. Roy. Soc. Edin., 45, p. 90.CrossRefGoogle Scholar