According to some embodiments, there is provided herein a fertilizer granule comprising Polyhalite and Ammonium Sulphate, wherein said granule comprises a concentration of 40-60% w/w Polyhalite and 60-40% w/w of Ammonium Sulphate.

According to some embodiments, there is provided herein a fertilizer granule comprising Polyhalite and Ammonium Sulphate, wherein said granule comprises a concentration of 40-60% w/w Polyhalite and 60-40% w/w of Ammonium Sulphate.

According to some demonstrative embodiments, there is provided herein a fertilizer granule comprising Polyhalite and potassium sulphate, wherein said Polyhalite is present in a concentration of 30-70% w/w and said Potassium Sulphate is present in a concentration of 70-30% w/w, wherein the strength of granule immediately after production 1.3 Kg granule.

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.sup.+, Na.sup.+), silicate salts, and alkaline earth metal ions (Mg.sup.2+, Ca.sup.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.

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.sup.+, Na.sup.+), silicate salts, and alkaline earth metal ions (Mg.sup.2+, Ca.sup.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.

A fertiliser product in the form of a pellet, granule or prill, the fertiliser product comprising: a first fertiliser composition capable of providing (a) two or more alkali metal and/or alkaline earth metal nutrients and (b) sulphur; and a second fertiliser composition, the second fertiliser composition being a nitrogen-providing fertiliser composition, and the first fertiliser composition being incorporated into the second fertiliser composition. A bulk fertiliser product comprising a plurality of the said fertiliser products.

A fertiliser product in the form of a pellet, granule or prill, the fertiliser product comprising: a first fertiliser composition capable of providing (a) two or more alkali metal and/or alkaline earth metal nutrients and (b) sulphur; and a second fertiliser composition, the second fertiliser composition being a nitrogen-providing fertiliser composition, and the first fertiliser composition being incorporated into the second fertiliser composition. A bulk fertiliser product comprising a plurality of the said fertiliser products.

A method, comprising: heating at a temperature of at least 90° C. for a time of at least 10 minutes and a pressure of at least one atmosphere: 1) a potassic framework silicate ore; 2) at least one material selected from the group consisting of an oxide, a hydroxide, and a carbonate of at least one of an alkaline earth metal and an alkali metal; and 3) water, thereby producing a first product; combining the first product with a source of a component to form a second product; and drying the second product to provide a composition comprising an MPM and the component, wherein the source of the component comprises at least one member selected from the group consisting of KCl, a macronutrient source, a micronutrient source and a source of a beneficial element. A composition, comprising: an MPM; and a component selected from the group consisting of a KCl, a macronutrient, a micronutrient and a beneficial element, wherein the MPM comprises at least two phases selected from the group consisting of K-feldspar phase, tobermorite phase, hydrogrossular phase, dicalcium silicate hydrate phase and amorphous phase.

The present disclosure concerns fertilizer particles comprising calcium nitrate and potassium nitrate. It is found that fertilizer particles comprising 43 to 47% w/w calcium nitrate and 46 to 54% w/w potassium nitrate can be produced by melt granulation. Due to undercooling problems, such particles were not expected to be suitable for industrial production by melt granulation. However, the present disclosure provides a composition which forms a low viscosity melt with short solidification time. This was successfully achieved by reducing the water content of a fertilizer melt comprising 43 to 47% w/w calcium nitrate and 46 to 54% w/w potassium nitrate to less than 3% w/w of the melt.

The present disclosure concerns fertilizer particles comprising calcium nitrate and potassium nitrate. It is found that fertilizer particles comprising 43 to 47% w/w calcium nitrate and 46 to 54% w/w potassium nitrate can be produced by melt granulation. Due to undercooling problems, such particles were not expected to be suitable for industrial production by melt granulation. However, the present disclosure provides a composition which forms a low viscosity melt with short solidification time. This was successfully achieved by reducing the water content of a fertilizer melt comprising 43 to 47% w/w calcium nitrate and 46 to 54% w/w potassium nitrate to less than 3% w/w of the melt.