Abstract:Colloidal silica will peptise Fe2O3 in alkaline media containing Na ions, but Ca ions cause flocculation of the silica and no peptisation of Fe2O2 occurs. It is concluded that the theory of Reifenberg on the formation of terra rossa on limestone is untenable.
Efficiency can be improved by recirculating air towards the end of a run. It has been found that, for even drying, a reversal of air flow about half-way through the run is desirable.
Efficiency can be improved by recirculating air towards the end of a run. It has been found that, for even drying, a reversal of air flow about half-way through the run is desirable.
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