Potassium-releasing material

Patent metadata

Field	Value
Publication number	US-10800712-B2
Application number	US-201815874801-A
Country	US
Kind code	B2
Filing date	Jan 18, 2018
Priority date	Jan 18, 2017
Publication date	Oct 13, 2020
Grant date	Oct 13, 2020

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.

First claim

What is claimed is:

1. A composition, comprising:
a K-feldspar phase; and
a calcium silicate hydrate phase comprising at least one phase selected from the group consisting of a dicalcium silicate hydrate phase, a tobermorite phase, and a hydrogarnet phase;
wherein:
the composition comprises the K-feldspar phase in an amount of at most about 65 wt. %; and at least one of the following holds:
the composition comprises at least about 1 wt. % of the dicalcium silicate hydrate phase;
the composition comprises at least about 1 wt. % of the tobermorite phase; and
the composition comprises at least about 1 wt. % of the hydrogarnet phase.

2. The composition of claim 1 , wherein the composition comprises at most about 60 wt. % of the K-feldspar phase.

3. The composition of claim 1 , wherein the composition comprises at least about 1 wt. % of the K-feldspar phase.

4. The composition of claim 1 , wherein the composition comprises at least about 1 wt. % of the calcium silicate hydrate phase.

5. The composition of claim 1 , wherein the composition comprises from about 1 wt. % to about 30 wt. % of the calcium silicate hydrate phase.

6. The composition of claim 1 , wherein the composition comprises the dicalcium silicate hydrate phase in an amount of at least about 1 wt. %.

7. The composition of claim 1 , wherein the composition comprises the tobermorite phase in an amount of at least about 1 wt. %.

8. The composition of claim 1 , wherein the composition comprises a hydrogarnet phase in an amount of at least about 1 wt. %.

9. The composition of claim 8 , wherein the hydrogarnet phase comprises plazolite or hydrogrossular.

10. The composition of claim 1 , further comprising an amorphous phase.

11. The composition of claim 10 , wherein the amorphous phase comprises a zeolite.

12. The composition of claim 10 , wherein the amorphous phase comprises at least one member selected from the group consisting of silica and calcium silica hydrates.

13. The composition of claim 1 , further comprising a zeolite.

14. The composition of claim 1 , further comprising one or more carbonates.

15. The composition of claim 1 , wherein the composition has a potassium release of at least about 5,000 mg of potassium per kilogram of the composition according to the 24-hour potassium release test.

16. The composition of claim 1 , wherein the composition has a calcium release of at least 15 mg of calcium per kilogram of the composition according to the 24-hour calcium release test.

17. The composition of claim 1 , wherein the composition has an aluminum release of at most 10 mg of aluminum per kilogram of the composition according to the 24-hour aluminum release test.

18. The composition of claim 1 , wherein the composition has a silicon release of at least 40 mg of silicon per kilogram of the composition according to the 24-hour silicon release test.

19. The composition of claim 1 , wherein the composition has a sodium release of at least 5 mg of sodium per kilogram of the composition according to the 24-hour sodium release test.

20. The composition of claim 1 , wherein the composition has a magnesium release of at least 5 mg of magnesium per kilogram of the composition according to the 24-hour magnesium release test.

21. The composition of claim 1 , wherein the composition has a potassium release of at least about 5,000 mg of potassium per kilogram of the composition according to the one-minute potassium release test.

22. The composition of claim 1 , wherein the composition has a relative potassium release of at least about five.

23. The composition of claim 1 , further comprising a carbonaceous material.

24. The composition of claim 1 , wherein the composition has a multimodal particle size distribution comprising particles having a diameter of from about 1 micron to about 1000 microns.

25. The composition of claim 1 , wherein the composition comprises aggregated particles having a size of from about 100 microns to about 1000 microns.

26. The composition of claim 1 , wherein the composition comprises particles having a specific surface area according to the BET method of from about 15.1 square meters per gram to about 46.9 square meters per gram.

27. The composition of claim 1 , wherein the composition has a particle size distribution of from about 0.01 micron to about 100 microns.

28. The composition of claim 1 , wherein the composition is useful in soil remediation.

29. A fertilizer comprising the composition of claim 1 .

Assignees

• Massachusetts Inst Technology
• Advanced Potash Tech Ltd

Inventors

• Ciceri Davide
• De Oliveira Marcelo
• Allanore Antoine
• Chen Dennis P
• Close Thomas C

Classifications

• Y02P40/10

  Production of cement, e.g. improving or optimising the production methods; Cement grinding · CPC title

• C05D5/00

  Fertilisers containing magnesium (C05D7/00 takes precedence) · CPC title

• C05D3/00

  Calcareous fertilisers (C05D7/00 takes precedence) · CPC title

• C05D9/02

  containing trace elements · CPC title

• C05D1/04 Primary

  from minerals or volcanic rocks · CPC title