Potassium-releasing material
AssigneesMassachusetts Institute of Technology (Mit), Advanced Potash Technologies Ltd
InventorsDavide Ciceri, Marcelo De Oliveira, Antoine Allanore, Dennis P. Chen, Thomas C. Close
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Abstract
The present disclosure, in various embodiments, discloses hydrothermal methods, hydrothermally modified materials and dried hydrothermally modified materials. Certain dried hydrothermally modified materials can readily releases ionic species such as alkali metal ions (K+, Na+), silicate salts, and alkaline earth metal ions (Mg2+, Ca2+). Some dried hydrothermally modified materials can readily release aluminum ions and/or silicon, such as in the form of soluble silicates. Such processes and materials are useful, for example in economically preparing potassium releasing fertilizers.
Claims20
A method, comprising:
- exposing a first composition to water and conditions selected from the group consisting of heat and pressure, thereby forming a combination comprising water and a second composition, the second composition comprising a K-feldspar phase;
- and
- removing at least some of the water from the combination, thereby providing a third composition;
- wherein:
- the third composition comprises the K-feldspar phase in an amount of at most about 65 wt. %;
- and
- at least one of the following holds:
- the third composition further comprises at least about 1 wt. % of a dicalcium silicate hydrate phase;
- the third composition further comprises at least about 1 wt. % of a tobermorite phase;
- and
- the third composition further comprises at least about 1 wt. % of a hydrogarnet phase.
Dependencies are inferred from the claim text.