Compressed salt objects

Patent metadata

Field	Value
Publication number	US-12435001-B2
Application number	US-201816498133-A
Country	US
Kind code	B2
Filing date	Mar 27, 2018
Priority date	Mar 31, 2017
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

Provided are objects constructed of compressed salt combinations including salt and at least one additive, wherein the at least one additive is selected to impart the object with resistance to water and humidity.

First claim

The invention claimed is:

1. A compressed salt water-resistant object, comprising:
a salt combination of a water-soluble salt comprising sodium chloride and at least one additional metal halide capable of interacting with carbonate or stearate to form a water-insoluble salt, and at least one additive selected from the group consisting of a water-soluble carbonate and a water-soluble stearate,
wherein the water-soluble carbonate and/or the water-soluble stearate in said salt combination interacts in situ with metal ions present in said salt combination to provide a water-insoluble salt of the carbonate and/or stearate, to impart the object with resistance to water and humidity,
the compressed salt water-resistant object being characterized by a compressive strength of at least 20 MPa, wherein the water-soluble salt of said salt combination comprises the byproduct of an industrial process, and wherein at least 90 wt % based on total weight of the salt combination is sodium chloride;
wherein the compressed salt water-resistant object is non-deliquescent even in absence of a coating, when measured at 40° C. at below 74% relative humidity; and wherein the compressed salt water-resistant object is a at least one of a block, board, a building unit, or a construction unit; and
wherein the salt combination comprises:
at least 0.1 wt % magnesium or calcium;
at least 0.05 wt % potassium;
at least 0.05 wt % bromine; and
at least 0.05 wt % sulfate, wherein the amount of magnesium chloride or calcium chloride is less than 0.001 wt %.

2. The object according to claim 1 , wherein the amount of the at least one additive, relative to the total weight of the salt combination, is at least 0.1 wt %.

3. The object according to claim 1 , further comprising an additional additive selected from the group consisting of C 12 to C 20 carboxylates, C 12 to C 20 carboxylic acids, water-soluble silicates, siloxane polymers, siloxane polymer precursors, phosphate salts, hydroxide salts, gypsum, lime slag cements, water-insoluble carbonate salts, and combinations thereof.

4. The object according to claim 1 , wherein the compressed salt combination further comprises at least one member selected from gypsum, or lime slag cement, or a water-soluble silicate, or a siloxane polymer precursor, or a siloxane polymer.

5. The object according to claim 1 , wherein the object further includes a layer of additive added to the surface of the object as one of a film or a coat prior to compression.

6. A structure constructed of two or more compressed objects according to claim 1 .

7. The object according to claim 1 , wherein the water-soluble salt that is the byproduct of an industrial process includes Mg or Ca ions, and said additive comprises a water-soluble carbonate-based salt, wherein the carbonate ion in said carbonate-based salt interacts in situ with the Mg or Ca ions present in said byproduct of an industrial process.

8. The object according to claim 1 , wherein the water-soluble salt that is the byproduct of an industrial process includes Mg or Ca ions, and said additive comprises a water-soluble stearate-based salt, wherein the stearate ion in said stearate-based salt interacts in situ with the Mg or Ca ions present in said byproduct of an industrial process.

9. The object according to claim 7 , further comprising at least one additional additive selected from C 12 to C 20 carboxylates, C 12 to C 20 carboxylic acids, water-soluble silicates, siloxane polymers, siloxane polymer precursors, phosphate salts, hydroxide salts, gypsum, lime slag cements, water-insoluble carbonate salts, and combinations thereof.

10. The object according to claim 8 , further comprising at least one additional additive selected from C 12 to C 20 carboxylates, C 12 to C 20 carboxylic acids, water-soluble silicates, siloxane polymers, siloxane polymer precursors, phosphate salts, hydroxide salts, gypsum, lime slag cements, water-insoluble carbonate salts, and combinations thereof.

11. A compressed salt water-resistant object, comprising:
a salt combination of a water-soluble salt comprising sodium chloride and at least one additional metal halide capable of interacting with carbonate or stearate to form a water-insoluble salt, and at least one additive selected from the group consisting of a water-soluble carbonate and a water-soluble stearate,
wherein the water-soluble carbonate and/or the water-soluble stearate in said salt combination interacts in situ with metal ions present in said salt combination to provide a water-insoluble salt of the carbonate and/or stearate, to impart the object with resistance to water and humidity,
the compressed salt water-resistant object being characterized by a compressive strength of at least 20 MPa, wherein the water-soluble salt of said salt combination comprises the byproduct of an industrial process, and wherein at least 90 wt % based on total weight of the salt combination is sodium chloride;
wherein the compressed salt water-resistant object is non-deliquescent even in absence of a coating, when measured at 40° C. at below 74% relative humidity; and wherein the compressed salt water-resistant object is a at least one of a block, board, a building unit, or a construction unit; and
wherein the water-soluble salt that is the byproduct of an industrial process includes Mg or Ca ions, and said additive comprises a water-soluble stearate-based salt, wherein the water-soluble stearate ion in said stearate-based salt interacts in situ with the Mg or Ca ions present in said byproduct of an industrial process.

12. The object according to claim 11 , wherein the amount of the at least one additive, relative to the total weight of the salt combination, is at least 0.1 wt %.

13. The object according to claim 11 , further comprising an additional additive selected from the group consisting of C 12 to C 20 carboxylates, C 12 to C 20 carboxylic acids, water-soluble silicates, siloxane polymers, siloxane polymer precursors, phosphate salts, hydroxide salts, gypsum, lime slag cements, water-insoluble carbonate salts, and combinations thereof.

14. The object according to claim 11 , wherein the compressed salt combination further comprises at least one member selected from gypsum, or lime slag cement, or a water-soluble silicate, or a siloxane polymer precursor, or a siloxane polymer.

15. The object according to claim 11 , wherein the object further includes a layer of additive added to the surface of the object as one of a film or a coat prior to compression.

16. A structure constructed of two or more compressed objects according to claim 11 .

17. The object according to claim 11 , wherein the water-soluble salt that is the byproduct of an industrial process includes Mg or Ca ions, and said additive comprises a water-soluble carbonate-based salt, wherein the water-soluble carbonate ion in said carbonate-based salt interacts in situ with the Mg or Ca ions present in said byproduct of an industrial process.

18. The object according to claim 17 , further comprising at least one additional additive selected from C 12 to C 20 carboxylates, C 12 to C 20 carboxylic acids, water-soluble silicates, siloxane polymers, siloxane polymer precursors, phosphate salts, hydroxide salts, gypsum, lime slag cements, water-insoluble carbonate salts, and combinations thereof.

Assignees

• Yissum Res Dev Co Of Hebrew Univ Jerusalem Ltd

Inventors

• Mandler Daniel
• Lapidot Noa
• Buffa Andrea
• Dikovsky Gabriel
• Rikanati Lihi

Classifications

• C04B2111/00293

  Materials impermeable to liquids · CPC title

• C04B41/50

  with inorganic materials · CPC title

• C04B41/48

  Macromolecular compounds · CPC title

• C04B28/26

  Silicates of the alkali metals · CPC title

• C04B28/10

  Lime cements or magnesium oxide cements · CPC title