Potassium-releasing material

Patent metadata

Field	Value
Publication number	US-2021053885-A1
Application number	US-202017061092-A
Country	US
Kind code	A1
Filing date	Oct 1, 2020
Priority date	Jan 18, 2017
Publication date	Feb 25, 2021
Grant date	—

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 (Mg 2+ , Ca 2+ ). 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 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.

2 . The method of claim 1 , wherein, according to the 24-hour potassium release test, the amount of potassium released from the third composition is at least about three times as much as the amount of potassium released from the first composition.

3 . The method of claim 1 , wherein, according to the 24-hour potassium release test, the amount of potassium released from the third composition is at least about four times as much as the amount of potassium released from the first composition.

4 . The method of claim 1 , wherein, according to the 24-hour potassium release test, the amount of potassium released from the third composition is at least about five times as much as the amount of potassium released from the first composition.

5 . The method of claim 1 , wherein, according to the 24-hour potassium release test, the amount of potassium released from the third composition is at least about 10 times as much as the amount of potassium released from the first composition.

6 . The method of claim 1 , wherein, according to the 24-hour potassium release test, the amount of potassium released from the third composition is at least about 25 times as much as the amount of potassium released from the first composition.

7 . The method of claim 1 , wherein, according to the 24-hour potassium release test, the amount of potassium released from the third composition is at least about 50 times as much as the amount of potassium released from the first composition.

8 . The method of claim 1 , wherein, according to the 24-hour potassium release test, the amount of potassium released from the third composition is at least about 100 times as much as the amount of potassium released from the first composition.

9 . The method of claim 1 , wherein removing water from the combination comprises drying the combination.

10 . The method of claim 1 , wherein removing water from the combination comprises flash drying the combination.

11 . The method of claim 1 , wherein removing water from the combination comprises vacuum drying the combination.

12 . The method of claim 1 , wherein exposing the combination occurs for a duration of at least about 5 minutes.

13 . The method of claim 1 , wherein removal of at least some of the water from the combination occurs for a duration of at least about 15 minutes.

14 . The method of claim 1 , wherein removing water from the combination comprises heating the combination to at least about 50° C.

15 . The method of claim 1 , wherein removing water from the combination comprises exposing the combination to an elevated atmospheric pressure.

16 . The method of claim 1 , wherein, during removal of water from the combination, the combination is exposed to a reactive atmosphere.

17 . The method of claim 16 , wherein the reactive atmosphere comprises at least one member selected from the group consisting of air, oxygen, ammonia, carbon monoxide, and carbon dioxide.

18 . The method of claim 1 , wherein, during removal of water from the combination, the combination is exposed to an inert atmosphere.

19 . The method of claim 18 , wherein the inert atmosphere comprises at least one member selected from the group consisting of argon and nitrogen.

20 . The method of claim 1 , further comprising milling a pre-combination that comprises: a) an alkali metal silicate; and b) at least one member selected from the group consisting of an alkali metal oxide, an alkaline metal hydroxide, an alkaline earth metal oxide, and an alkaline earth metal hydroxide, thereby providing the first composition.

Assignees

• Massachusetts Inst Technology
• Advanced Potash Tech Ltd

Inventors

• Ciceri Davide
• Oliveira Marcelo De
• 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

• C05D9/02

  containing trace elements · CPC title

• C05D1/04 Primary

  from minerals or volcanic rocks · CPC title

• C01B33/26

  Aluminium-containing silicates {, i.e. silico-aluminates} · CPC title