Composite mixture

Abstract

The invention relates to a polyhalite suspension and a preparation method thereof. The polyhalite suspension may also include one or more dispersants, thickeners, rheology modifiers, preservatives, antifoams, wetting agents, and antifreeze agents in a liquid solvent, preferably water.

Description

Technical Field

[0001] The present invention relates to a polyhalite suspension and a preparation method thereof. The polyhalite suspension may also include one or more dispersants, thickeners, rheology modifiers, preservatives, defoamers, wetting agents and antifreeze agents in a liquid solvent (preferably water). Background Art

[0002] Polyhalite (K 2 Ca 2 Mg(SO 4 ) 4 ·2H 2 Polyhalite (O) is a mineral that is well known as a multi-nutrient fertilizer containing sulfate, potassium, magnesium and calcium. It is currently in practical use in powder and granular forms. In addition to other uses in solid form for specific applications, polyhalite in this solid form is used as a solid fertilizer. Problems may include dust generation, difficult or inaccurate metering when weighing is required, or bulk handling issues as a solid material. In addition, polyhalite has limited solubility in water and once used with water, it can cause pipe blockages or plugging without sufficient pressure to flush the system and the particle size is not suitable. Therefore, making polyhalite impractical for use in irrigation / fertigation systems in its native form.

[0003] Polyhalite suspensions are needed to improve the above-mentioned problems of application in liquid media. Summary of the invention

[0004] An embodiment of the present invention provides a polyhalite suspension, which comprises:

[0005] 50 to 80% (w / w), preferably 55 to 75% (w / w), more preferably 60 to 65% (w / w) polyhalite,

[0006] 15 to 40% (w / w), preferably 15 to 35% (w / w), more preferably 20 to 30% (w / w) liquid solvent (such as water); and

[0007] • 0.5 to 10% (w / w), preferably 1 to 8% (w / w), even more preferably 2 to 5% (w / w) dispersant.

[0008] The suspension further comprises 0.1 to 12% (w / w), preferably 0.5 to 5% (w / w), even more preferably 0.75 to 3% (w / w) of a viscosity modifier or thickener.

[0009] The suspension may also include one or more of a rheology modifier, a preservative, a defoamer, a wetting agent, and an antifreeze component.

[0010] The polyhalite typically has a particle size range of less than 150 microns, less than 100 microns, or less than 50 microns. Preferably, the polyhalite has a particle size distribution of 90% below 30 microns.

[0011] In another embodiment of the present invention, there is provided a method for preparing a polyhalite suspension, comprising mixing 50 to 80% (w / w), preferably 55 to 75% (w / w), more preferably 60 to 65% (w / w) polyhalite with 15 to 40% (w / w), preferably 15 to 35% (w / w), more preferably 20 to 30% (w / w) liquid solvent and 0.5 to 10% (w / w), preferably 1 to 8% (w / w), even more preferably 2 to 5% (w / w) dispersant to produce a polyhalite suspension.

[0012] The polyhalite may be mixed with a solid mineral or inorganic salt to produce a mixed solid suspension prior to the addition of the liquid solvent and dispersant. The solid mineral or inorganic salt is present in an amount of 1 to 30% (by weight of solids) and may be selected from inorganic oxides, carbonates or sulfates, not limited to oxides and dioxides, chemically stable carbonates or sulfates of inorganic salts of calcium, magnesium, zinc, manganese, titanium, potassium, copper and iron, inorganic salts of organic acids such as ethylenediaminetetraacetic acid or other chelating agents, or combinations thereof.

[0013] Typically, the components are mixed using a high shear mixing system.

[0014] The method may further comprise additionally mixing 0.1 to 12% (w / w), preferably 0.5 to 5% (w / w), even more preferably 0.75 to 3% (w / w) of a viscosity modifier or thickener.

[0015] The method may also include mixing one or more of formulation enhancers (optionally rheology modifiers, preservatives, defoamers, wetting agents, and antifreeze components).

[0016] In another embodiment of the present invention, there is provided a process for producing a polyhalite suspension as described above, which involves a solid premix containing the polyhalite and a dispersant in solid form suitable for mixing with a liquid solvent.

[0017] In another embodiment of the present invention, there is provided a polyhalite-containing powder for producing the polyhalite suspension as described above, which comprises polyhalite and a dispersant in solid form suitable for mixing with a liquid solvent.

[0018] The premix or polyhalite-containing powder may also include a viscosity modifier or thickener in solid form.

[0019] The premix or polyhalite-containing powder may also include one or more of the formulation enhancers (optionally rheology modifiers, preservatives, defoamers, wetting agents, and antifreeze components) in admixed solid form.

[0020] The premix or powder containing polyhalite may also include one or more of other solid minerals or inorganic salts mixed to produce a mixed solid suspension. The solid mineral or inorganic salt may be present in an amount of 1% to 30% (by solid weight) and may be selected from inorganic oxides, carbonates or sulfates, not limited to oxides and dioxides, chemically stable carbonates or sulfates of inorganic salts of calcium, magnesium, zinc, manganese, titanium, potassium, copper and iron, inorganic salts of organic acids (such as ethylenediaminetetraacetic acid) or other chelating agents or combinations thereof.

[0021] The dispersant may be selected from lignin sulfonates, phosphate esters, high molecular weight polymers (such as polyacrylate or polycarboxylate derived dispersants), or combinations thereof.

[0022] The viscosity modifier or thickener may be selected from: natural or synthetic gums, optionally carrageenan, xanthan gum, gellan gum, arabic gum; cellulose; clay-based modifiers, optionally attapulgite, bentonite, montmorillonite; polymeric modifiers, optionally pH or chemically activated cross-linked polymers; or combinations thereof.

[0023] In addition, an activator compound may be added to improve the performance of certain selected modifiers, which provides better control of the viscosity of the formulation through pH adjustment or through interactions within the gel structure. The activator compound may be selected from the group of pyrophosphates such as sodium pyrophosphate or potassium pyrophosphate or a combination thereof, and may be present in an amount of 0.1 to 1% by weight.

[0024] The rheology modifier may be selected from: mineral and synthetic forms, optionally silicates, or aluminosilicates, including but not limited to magnesium silicate, magnesium aluminum silicate, calcium silicate or calcium aluminosilicate; kaolin or other clay-based minerals; or polymeric materials including cationic, nonionic and anionic swellable polymers, or combinations thereof, and may be present in an amount of 0.5 to 5%, 0.75% to 3.5% or 1% to 3% (by weight).

[0025] The preservative may be selected from bactericidal or bacteriostatic type preservatives, bactericide solutions containing optionally isothiazolinones or bacteriostatic compounds (including but not limited to sodium and potassium salts of benzoate and propionate), or combinations thereof, and may be present in an amount of 0.01 to 1%, preferably 0.05 to 0.5%, even more preferably 0.1 to 0.2% (by weight).

[0026] The defoaming agent may be selected from a silicone-based emulsion, a non-silicone-based emulsion, a stearate (optionally cetearyl alcohol or ethylene glycol) or a combination thereof, and may be present in an amount of 0.01 to 0.5%, preferably 0.025 to 0.25%, even more preferably 0.05 to 0.20% (by weight).

[0027] The wetting agent can be selected from various types of surfactants. Examples include alkyl and alkyl amido betaines, or fatty acid, methyl ester or vegetable oil ethoxylates, cocamidopropyl betaine, anionic surfactants (such as sodium dodecylbenzene sulfonate), cationic surfactants (such as quaternary ammonium salts) or combinations thereof, and the embodiments can be present in an amount of 0.5 to 5%, preferably 1.0 to 3.0%, even more preferably 1.5 to 2.5% (by weight).

[0028] The antifreeze agent may be selected from freezing point depressants (such as alcohols, polyols or sugar alcohols), including but not limited to monoethylene glycol, polyethylene glycol, propylene glycol, sorbitol, glycerol and molasses or a combination thereof. Others may include salts and soluble substances to reduce the freezing point, including but not limited to urea and alkali metal chlorides or a combination thereof. And the antifreeze agent may be present in an amount of 0.5 to 15%, preferably 1 to 12%, even more preferably 5 to 10% (by weight).

[0029] The pH value of the polyhalite suspension ranges from 5 to 9, preferably from 5.5 to 8.5, more preferably from 6 to 8.

[0030] The density of polyhalite suspension ranges from 1.50 to 2.00 g / cm 3 , preferably 1.60 to 1.90 g / cm 3 , more preferably 1.70 to 1.80 g / cm 3 .

[0031] The viscosity of the polyhalite suspension ranges from 3500 to 7500 centipoise (3.5 to 7.5 Pa.s), preferably from 4500 to 6500 centipoise (4.5 to 6.5 Pa.s), more preferably from 5000 to 6000 centipoise (5 to 6 Pa.s).

[0032] In another embodiment, the present invention provides a polyhalite suspension comprising:

[0033] 60.00% (w / w) polyhalite,

[0034] ·26.50% (w / w) water,

[0035] 2.82% (w / w) sodium lignin sulfonate powder,

[0036] ·1.10% (w / w) bentonite clay,

[0037] 4.30% (w / w) polyethylene glycol,

[0038] 5.00% (w / w) sorbitol,

[0039] 0.18% (w / w) defoamer, and

[0040] 0.1% (w / w) fungicide.

[0041] In another embodiment, the present invention provides a polyhalite suspension comprising:

[0042] 59.98% (w / w) polyhalite,

[0043] ·34.61% (w / w) water,

[0044] 2% (w / w) potassium lignin sulfonate powder,

[0045] 1% (w / w) attapulgite clay,

[0046] 1.7% (w / w) glycerol,

[0047] 0.23% (w / w) defoamer,

[0048] 0.1% (w / w) tetrasodium pyrophosphate,

[0049] 0.1% (w / w) disodium ethylenediaminetetraacetate (sodium EDTA),

[0050] 0.17% (w / w) xanthan gum, and

[0051] 0.11% (w / w) bactericide solution. DETAILED DESCRIPTION

[0052] According to the present invention, the term "stable" may be defined as a state in which the settling rate of the particles in suspension (i.e. the polyhalite in suspension) is reduced by the formulation according to the present invention, thereby reducing the natural phase separation, which results in the settling of the solids occurring on a longer time scale than a mere suspension of the polyhalite in a liquid medium or solvent.

[0053] The present invention relates to a suspension of the mineral polyhalite in a liquid medium or solvent (such as water, vegetable oil, mineral oil, glycerine, any other solvent capable of dispersing polyhalite powder, or alcohol), and in particular to a high density, viscous liquid suspension that can be used for applications for commercial and industrial purposes and provides high dosage of polyhalite in a fluidized form for selected applications.

[0054] The present invention provides a flowable suspended polyhalite product involving a liquid phase having a solid medium (polyhalite) suspended therein.

[0055] The suspended polyhalite of the present invention has a variety of applications, including but not limited to: aerial applications, such as tree cultivation by airplanes, helicopters, field applications via unmanned aerial systems (UAS), etc.; fire extinguishing agent / fire retardant; as a drilling additive or as a proppant for hydrocarbon recovery, due to the greater density of polyhalite than water and due to the thixotropy of the suspended material; a heat exchanger, due to its high thermal insulation capabilities; as a fluid medium for soil remediation / restoration of contaminated land; a delivery method for soil amendments to replace potentially toxic elements and cations in the soil; as a potential granulation aid or coating agent in the production of granular products; and for transporting polyhalite in flooded systems like rice, thereby adding nutrients to intentionally flooded areas, which are deposited on the soil when the water drains away.

[0056] The properties of the suspended polyhalite allow its application to be implemented using a variety of equipment and infrastructure, including but not limited to agricultural (such as greenhouse) irrigation systems, drip and pivot irrigation, boom sprayers, backpack sprayers, and tractor mounted / self-propelled spray equipment. Stable suspended polyhalite can be used in applications where the use of solid particles is more challenging, for example, it is difficult to distribute polyhalite particles in a ring around a single tree in an even manner in an orchard, and pipes including aqueous polyhalite suspensions can be delivered to the root zone of the tree, which is more precise and efficient in practice; delivering a high density liquid that can use the physical properties of suspended solids (polyhalite) that are not classified according to the current Classification, Labelling and Packaging (CLP) guidelines for substances and mixtures. The present invention allows polyhalite to be delivered in conjunction with a liquid solvent (such as water, vegetable oil, mineral oil, glycerine, any other solvent that can partially dissolve polyhalite powder, or alcohol).

[0057] The polyhalite suspension of the present invention may be a stable suspension.

[0058] The present invention also includes the addition of a suitable dispersant, which is important for achieving the desired concentration of the active ingredient. The dispersant is not seaweed, polynaphthalene sulfonate or alginic acid. In addition, a viscosity modifier or thickener may be added, which is very important for preventing phase separation which starts immediately and is completed within a few hours.

[0059] The polyhalite suspension concentrate may also include one or more of a rheology modifier, a preservative, a defoamer, a wetting agent, and an antifreeze agent.

[0060] A suspension of polyhalite in an aqueous medium or solvent is produced by mixing a dispersant, a viscosity regulator or thickener, a rheology modifier, a preservative, a defoamer, a wetting agent, an antifreeze agent, water and the polyhalite using a high shear propulsion system.

[0061] The present invention also relates to a method for preparing the polyhalite suspension as described above.

[0062] In another embodiment of the present invention, a powder containing polyhalite is provided, which includes polyhalite powder and a dispersant. The powder containing polyhalite includes one or more of a formulation enhancer, and the formulation enhancer includes a rheology modifier, a preservative, a defoamer, a wetting agent, and an antifreeze agent in solid form.

[0063] In another embodiment of the present invention, a method for preparing a polyhalite suspension is provided, which comprises adding a certain amount of liquid (such as water, vegetable oil, mineral oil, diluted or pure glycerol, any other solvent capable of partially dissolving polyhalite powder, or alcohol) to a powder containing polyhalite to produce a polyhalite suspension. A defoamer, preservative and / or antifreeze agent may also be added.

[0064] In another embodiment of the present invention, there is provided use of the polyhalite suspension described herein for application to an area.

[0065] Example 1

[0066] The formulation of the following examples is based on a total amount of 1000 g of the composition.

[0067] Recipe 1

[0068] 600.0g polyhalite

[0069] 265.0g water

[0070] 28.2g sodium lignin sulfonate powder

[0071] 11.0g bentonite clay

[0072] 50.0g sorbitol

[0073] 43.0g polyethylene glycol

[0074] 1.8g defoamer

[0075] 1.0g sodium propionate

[0076] The total amount of the above composition is 1000 g.

[0077] The elemental composition of the above formulation (in % (w / w)) is 7.0% K, 2.7% Mg, 7.7% Ca, 11.4% S.

[0078] Method - Example 1

[0079] 600 g of polyhalite powder, 28.2 g of sodium lignin sulfonate, 1.0 g of sodium propionate and 5.5 g of bentonite clay were weighed into a container and mixed into a homogeneous powder using a conical laboratory mixer and a sealed flat bottom glass cup system at a speed of 15 rpm for 10 minutes.

[0080] Weigh the beaker and stirrer. Add 210g of water, 43g of polyethylene glycol, and 50g of sorbitol to the beaker under the overhead stirrer equipped with a four-blade propeller. Add 1.8g of defoamer. Lower the stirrer into the mixture and turn it on at 800 rpm. Add 5.5g of bentonite clay to the mixture until it is dispersed. Increase the stirrer speed as needed, up to 1500 rpm.

[0081] 317.4 g of the polyhalite powder mixture was added to the liquid mixture in 50 g increments and the shear was increased to 2000 rpm as needed. After all the solids from the first addition were combined, 317.3 g of the polyhalite powder mixture was added and the shear was increased to 2500 rpm. Once all the powder was evenly dispersed in the suspension, the mixture was allowed to stand for 15 minutes.

[0082] Thereafter, the mixture was left at a speed of up to 2500 rpm for at least 30 minutes to disperse completely. The beaker with stirrer was weighed and tared to 1000 g with water.

[0083] The pH value of the above embodiment is in the range of 8 to 9.

[0084] The density of the above embodiment is 1.71 g / cm 3 .

[0085] The viscosity of the above embodiments is in the range of 5000 to 6000 centipoise (5 to 6 Pa.s) @ 10 rpm using a Brookfield LVD-1 viscometer, spindle S63.

[0086] Example 2

[0087] The formulations of the following examples are based on a total amount of 1000 g of the composition.

[0088] Recipe 2

[0089] 599.8g polyhalite

[0090] 346.1g water

[0091] 20g potassium lignin sulfonate powder

[0092] 10g attapulgite clay

[0093] 17g glycerin

[0094] 2.3g defoamer

[0095] 1g Tetrasodium Pyrophosphate

[0096] 1g Disodium EDTA (Sodium EDTA)

[0097] 1.7g xanthan gum

[0098] 1.1g fungicide solution

[0099] The total amount of the above composition is 1000 g.

[0100] The elemental composition of the above formulation (in % (w / w)) is 7.0% K, 2.7% Mg, 7.7% Ca, 11.4% S.

[0101] Method - Example 2

[0102] 599.8 g of polyhalite powder, 20 g of potassium lignin sulfonate were weighed into a container and mixed into a homogeneous powder using a conical laboratory mixer and a sealed flat bottom glass cup system at a speed of 15 rpm for 10 minutes.

[0103] Weigh the beaker and stirrer. Add 300g of water and 17g of glycerin to the beaker under the overhead stirrer equipped with a four-blade propeller. Add 2.3g of defoamer. Lower the stirrer into the mixture and turn it on at 800rpm. Add 1g of tetrasodium pyrophosphate and 1g of sodium EDTA to the mixture until it dissolves. Add 10g of attapulgite clay and 1.7g of xanthan gum and disperse them completely into the mixture to increase the liquid phase viscosity.

[0104] 312.8 g of the polyhalite powder mixture was added to the liquid mixture in 50 g increments and the agitator speed was increased to 2000 rpm as needed. After all solids from the first addition were combined, 312.8 g of the polyhalite powder mixture was added and the shear was increased to 2500 rpm. Once all the powder was evenly dispersed in the suspension, the mixture was stirred for 15 minutes.

[0105] Thereafter, the mixture was left at a speed of up to 2500 rpm for at least 30 minutes to disperse completely. The beaker with stirrer was weighed and tared to 1000 g with water.

[0106] The pH value of the above embodiment is in the range of 7 to 8.

[0107] The density of the above embodiment is 1.71 g / cm 3 .

[0108] The viscosity of the above embodiments ranges from 7000 to 7900 centipoise (6 to 7.5 Pa.s) @ 10 rpm using a Brookfield LVD-1 viscometer, spindle S63.

[0109] By the same method as above, the viscosity increased to 10,000 cps @ 10 rpm after standing overnight.

[0110] All ranges disclosed herein include the endpoints and all numbers between the endpoints.

Claims

1. A polyhalite suspension comprising: 50 to 80% (w / w) polyhalite, 15 to 40% (w / w) liquid solvent, and • 0.5 to 10% (w / w) dispersant.

2. The suspension according to claim 1, further comprising 0.1 to 12% (w / w), 0.5 to 5% (w / w) or 0.75 to 3% (w / w) of a viscosity modifier or thickener.

3. The suspension according to claim 1 or 2, further comprising one or more formulation enhancers including rheology modifiers, preservatives, defoamers, wetting agents and antifreeze components.

4. The suspension according to any one of claims 1 to 3, wherein The polyhalite has a particle size of less than 150 microns, less than 100 microns, or less than 50 microns.

5. The suspension according to any one of claims 1 to 4, wherein The liquid solvent is water.

6. The suspension according to any one of claims 2 to 5, wherein The dispersant is selected from lignin sulfonate, phosphate ester, high molecular weight polymer, polycarboxylate derived dispersant, or a combination thereof.

7. The suspension according to any one of claims 2 to 6, wherein The viscosity modifier or thickener is selected from: a natural or synthetically derived gum, optionally carrageenan, xanthan gum, gellan gum or arabic gum; a cellulose; a clay-based modifier, optionally attapulgite, bentonite or montmorillonite; or a polymeric modifier, optionally a pH activated cross-linked polymer; or a combination thereof.

8. The suspension according to any one of claims 3 to 7, wherein The rheology modifier is present in an amount of 0.5 to 5%, 0.75 to 3.5%, or 1 to 3% by weight, and / or the rheology modifier is selected from mineral and synthetic forms, optionally: silicates and aluminosilicates, including magnesium silicate, magnesium aluminum silicate, calcium silicate or calcium aluminosilicate; kaolin or other clay-based minerals; or polymeric materials, including cationic, nonionic or anionic swellable polymers; or combinations thereof.

9. The suspension according to any one of claims 3 to 8, wherein The preservative is present in an amount of 0.01 to 1.0%, 0.05 to 0.5% or 0.1 to 0.2% by weight, and / or the preservative is selected from: a bactericidal or bacteriostatic class of preservatives; a solution containing a bactericidal or bacteriostatic compound, optionally such as an isothiazolinone; or a sodium or potassium salt of a benzoate or propionate; or a combination thereof.

10. The suspension according to any one of claims 3 to 9, wherein The defoamer is present in an amount of 0.01 to 0.5%, 0.025 to 0.25%, or 0.05 to 0.20% by weight, and / or the defoamer is selected from a silicone-based emulsion or a non-silicone-based emulsion, optionally cetearyl alcohol or a stearate of ethylene glycol, or a combination thereof.

11. The suspension according to any one of claims 3 to 10, wherein The antifreeze agent is present in an amount of 0.5 to 15%, 1 to 12%, or 5 to 10% by weight.

12. The suspension according to any one of claims 3 to 11, wherein The antifreeze agent is selected from: a freezing point depressant, optionally an alcohol, a polyol or a sugar alcohol, selected from monoethylene glycol, polyethylene glycol, propylene glycol, glycerol, sorbitol or molasses; or a salt or soluble substance used to reduce the freezing point, optionally urea or an alkali metal chloride; or a combination thereof.

13. The suspension according to any one of claims 3 to 12, wherein The wetting agent is present in an amount of 0.5 to 5.0%, 1.0 to 3.0%, or 1.5 to 2.5% by weight.

14. The suspension according to any one of claims 3 to 13, wherein The wetting agent is selected from: alkyl or alkylamido betaine; fatty acid, methyl ester or vegetable oil ethoxylate; cocamidopropyl betaine; anionic surfactant, optionally sodium dodecylbenzene sulfonate; or cationic surfactant, optionally quaternary ammonium salt; or a combination thereof.

15. The suspension according to any one of claims 1 to 14, additionally adding an activator compound present in an amount of 0.1 to 1.0% by weight, and / or the activator compound is selected from the group of pyrophosphates, optionally sodium pyrophosphate or potassium pyrophosphate or a combination thereof.

16. The suspension according to any one of claims 1 to 15, wherein The pH range of the polyhalite suspension is 5 to 9, 5.5 to 8.5, or 6 to 8.

17. The suspension according to any one of claims 1 to 16, wherein The density of the polyhalite suspension ranges from 1.50 to 2.00 g / cm 3 , 1.60 to 1.90 g / cm 3 , or 1.70 to 1.80 g / cm 3 , and / or the viscosity of the polyhalite suspension ranges from 3500 to 7500 centipoise (3.5 to 7.5 Pa.s), 4500 to 6500 centipoise (4.5 to 6.5 Pa.s), or 5000 to 6000 centipoise (5 to 6 Pa.s).

18. The suspension according to any one of claims 1 to 17, wherein The polyhalite is mixed with the solid mineral or inorganic salt to produce a mixed solid suspension prior to the addition of the liquid solvent and dispersant.

19. The suspension according to claim 18, wherein The solid mineral or inorganic salt is present in an amount of 1 to 30% by weight of the solids and / or is selected from inorganic oxides, carbonates or sulfates, not limited to oxides and dioxides, chemically stable carbonates or sulfates of inorganic salts of calcium, magnesium, zinc, manganese, titanium, potassium, copper and iron, inorganic salts of organic acids or other chelating agents or combinations thereof.

20. A method for preparing a polyhalite suspension, comprising mixing 50 to 80% (w / w) polyhalite with 15 to 40% (w / w) liquid solvent and 0.5 to 10% (w / w) dispersant to produce a polyhalite suspension.

21. The method according to claim 20, wherein: The components are mixed using a high shear system.

22. The method according to claim 20 or 21, comprising additionally mixing 0.1 to 12% (w / w), 0.5 to 5% (w / w), or 0.75 to 3% (w / w) of a viscosity modifier or thickener.

23. The method according to any one of claims 20 to 22, wherein: The liquid solvent is water.

24. The method of any one of claims 20 to 23, further comprising mixing one or more of a rheology modifier, a preservative, a defoamer, a wetting agent, an antifreeze component, and an activator compound.

25. A polyhalite-containing powder comprising polyhalite and a dispersant in solid form suitable for mixing with a liquid solvent for producing a polyhalite suspension according to claim 1.

26. The polyhalite-containing powder according to claim 25, further comprising a viscosity modifier or thickener in solid form.

27. The polyhalite-containing powder according to claim 25 or 26, further comprising one or more of a rheology modifier, a preservative, a defoamer, a wetting agent, an antifreeze agent and an activator component in mixed solid form.

28. The polyhalite-containing powder according to any one of claims 25 to 27, further comprising mixing the polyhalite suspension with a solid mineral or inorganic salt.

29. The polyhalite-containing powder according to claim 28, wherein The solid mineral or inorganic salt is selected from inorganic oxides, carbonates or sulfates, not limited to oxides and dioxides, chemically stable carbonates or sulfates of inorganic salts of calcium, magnesium, zinc, manganese, titanium, potassium, copper and iron, inorganic salts of organic acids or other chelating agents or combinations thereof.

30. The polyhalite suspension of claim 1, comprising: 60.00% (w / w) polyhalite, 26.50% (w / w) water, 2.82% (w / w) sodium lignin sulfonate powder, 1.10% (w / w) bentonite clay, 4.30% (w / w) polyethylene glycol, 5.00% (w / w) sorbitol, 0.18% (w / w) defoamer, and 0.10% (w / w) bactericide.

31. The polyhalite suspension of claim 1, comprising: 59.98% (w / w) polyhalite, 34.61% (w / w) water, 2% (w / w) potassium lignin sulfonate powder, 1% (w / w) concave plagiolite clay, 1.7% (w / w) glycerol, 0.23% (w / w) defoamer, 0.1% (w / w) tetrasodium pyrophosphate, 0.1% (w / w) disodium ethylenediaminetetraacetate (sodium EDTA), 0.17% (w / w) xanthan gum, and 0.11% (w / w) fungicide solution.