Stability and Activity of Activated Silica Sols

Henry, Clarence R.

doi:10.1002/j.1551-8833.1952.tb15293.x

Cited by 3 publications

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“…Sol activities were judged by a semiquantitative jar test based on a method described by Henry (1952). One-liter portions of a suspension of fine kaolin clay were flocculated, using silica and alum dosages of 10 and 25 p.p.m., respectively.…”

Section: Polymerization Of Silicatesmentioning

confidence: 99%

Mechanism of activated silica sol formation

Lange¹,

Spencer²

1968

Environ. Sci. Technol.

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Activated silica sols have had a long history as coagulant aids. These activated sols differ from stabilized sols primarily in that the polymerization of the silicate is not halted to give a stable particle. The rate of polymerization is changed by dilution before gel formation takes place. By following pH and light scattering changes within the sol systems, conclusions have been drawn as to the mechanism of polymerization and the effect of dilution upon polymerization. In forming the activated sols, sulfuric acid and ammonium sulfate were used. These two reagents give significantly different polymerization behavior to warrant modification of the polymerization mechanism in the presence of ammonium ion. Flocculation tests conducted with kaolin clay, using the activated sols as coagulant aids, mirror the fundamental behavior measured by pH and light scattering. Thus the fundamental data obtained on the sols themselves can be applied to practical jar test procedures in a meaningful way.

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Section: Polymerization Of Silicatesmentioning

confidence: 99%

Mechanism of activated silica sol formation

Lange¹,

Spencer²

1968

Environ. Sci. Technol.

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show abstract

“…Ifthe solution is not stabilized by dilution at the desired point, the solution will eventually gel. The factors influencing the activity and stability of activated silica sols have been discussed by Henry (2) and Merrill (3) . Some neutralizing agents, such as sulfuric acid, produce a sol that…”

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confidence: 99%