Abstract

A method of processing a powder comprising ash has steps: (a) combining the powder with sulphuric or phosphoric acid or a mixture thereof; (b) optionally increasing the alkaline earth metal oxide, carbonate and/or hydroxide content of the powder by adding one or more alkaline earth metal oxides, carbonates, hydroxides or mixtures thereof; and (c) mixing and granulating the combination of (b) to form granules, wherein the combination of (a) has a pH of up to 7, and wherein the reaction between the acid and the alkaline earth metal oxide, carbonate and/or hydroxide produces self-curing granules and generates heat which at least partially dries the granules. Granules obtained are used as is or in fertiliser.

IPC Classes  ?

• C05B 11/08 - Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using sulfuric acid
• C05B 11/10 - Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using orthophosphoric acid
• C05B 17/00 - Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
• C05D 9/00 - Other inorganic fertilisers

Abstract

A method of processing a mineral powder (e.g. a zeolite in powdered form) comprises (a) contacting the powder with (i) water or a solution of sulphuric acid or phosphoric acidor a mixture thereof, or (ii) one or more alkaline earth metal oxides, carbonates or hydroxides, or a mixture thereof; (b) combining the product of (a)(i) with one or more alkaline earth metal oxides, carbonates or hydroxides, or a mixture thereof; or combining the product of (a)(ii) with water or a solution of sulphuric acid or phosphoric acid or a mixture thereof and optionally with further of the alkaline earth metal oxides, carbonates or hydroxides, or a mixture thereof; (c) granulating the combination of (b) to form granules of mass median diameter (MMD) from 1 mm to 10mm; and (d) allowing the resulting granules from step (c) to cure.

IPC Classes  ?

• C05B 11/08 - Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using sulfuric acid
• C05B 11/10 - Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using orthophosphoric acid
• C05B 17/00 - Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
• C05D 9/00 - Other inorganic fertilisers
• D21H 21/10 - Retention agents or drainage improvers

Abstract

A method of processing a powder, comprising (a) contacting the powder with (i) a 2-40% by weight solution of a sulphur- or phosphorous-containing mineral acid or a mixture thereof, or (ii) one or more alkaline earth metal oxides, carbonates or hydroxides, or a mixture thereof; (b) combining the product of (a)(i) with one or more alkaline earth metal oxides, carbonates or hydroxides, or a mixture thereof; or combining the product of (a)(ii) with a 2-40% by weight solution of a sulphur- or phosphorous-containing mineral acid or a mixture thereof and optionally with further of the alkaline earth metal oxides, carbonates or hydroxides, or a mixture thereof; and (c) granulating the combination of (b) to form granules. Phosphate- and potassium-containing fertilisers are made using the granules.

IPC Classes  ?

• C05B 11/08 - Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using sulfuric acid
• C05B 11/10 - Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using orthophosphoric acid
• C05B 17/00 - Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal