Method for improving vermiculite's intake of ammonium ions,...

Details Method for improving vermiculite's intake of ammonium ions,... Method for improving vermiculite's intake of ammonium ions,...

2011-04-19

2011-04-19

Langel, Wayne (Department: 1736)

Hydraulic and earth engineering

Soil remediation

In situ contaminant removal or stabilization

C047S05810R, C071S062000, C071S903000, C095S128000, C210S749000, C210S766000, C210S903000, C405S128550

Reexamination Certificate

active

07927039

ABSTRACT:
The invention relates to a method for improving vermiculite's intake of ammonium, in which method heating of the crude vermiculite is conducted to a temperature where vermiculite's third dehydration step takes place, the temperature being lower than the temperature where vermiculite's fourth dehydration/dehydroxylation step takes place. The invention relates also to use of the obtained vermiculite and to an absorption material, comprising vermiculite material and additives, where at least 50% of the vermiculite material comprises vermiculite, which has undergone the third dehydration step but not the fourth dehydration/dehydroxylation step. The invention relates also to use of thermally treated and ammonium doped vermiculite as fertilizer/soil conditioner.

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Weis et al., “Dehydration and rehydration of natural Mg-vermiculite,” 45Geologica Carpathica—Series Clays33-39 (1994).

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