# US 11,999,665 B2 · Composite fertiliser systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,999,665 B2 - Document ID: US11999665B2 - Status: Granted - Kind: B2 - Application number: 17/144,026 - Filed: 2021-01-07 - Published: 2021-05-06 - Granted: 2024-06-04 - Earliest claimed: 2015-11-13 - Assignees: York Potash Ltd - Applicants: York Potash Ltd - Inventors: Robert John Meakin; Timothy David Lewis - Web page: https://patentgrep.com/patent/US11999665B2 ## CPC - C05C 9/005: {Post-treatment} - C05D 1/00: Fertilisers containing potassium (C05D7/00 takes precedence) - C05G 5/12: Granules or flakes - C05G 5/30: Layered or coated, e.g. dust-preventing coatings - C05C: NITROGENOUS FERTILISERS - C05D: INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE - C05G: MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS (organic fertilisers containing added bacterial cultures, mycelia, or the like C05F11/08; organic fertilisers containing plant vitamins or hormones C05F11/10); FERTILISERS CHARACTERISED BY THEIR FORM ## Abstract A fertiliser pellet comprising: a first region of a nitrogen-providing fertiliser composition; and a second region adhered to the exterior of the first region, the second region comprising a fertiliser composition capable of providing (a) two or more alkali metal and/or alkaline earth metal nutrients and (b) sulphur. ## Claims ### Claim 1 A fertiliser pellet comprising: a first region of a nitrogen-providing fertiliser composition; and a second region adhered to the exterior of the first region, wherein the second region substantially surrounds the first region, the second region comprising polyhalite. ### Claim 2 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the first region comprises more than 80% by weight of urea. ### Claim 3 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the first region comprises more than 30% by weight of nitrogen. ### Claim 4 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the second region comprises more than 30% by weight of alkali metal and/or alkaline earth metal nutrients. ### Claim 5 (depends on 4) A fertiliser pellet as claimed in claim 4, wherein the alkali metal and/or alkaline earth metal nutrients are or are selected from the group comprising potassium, calcium and magnesium. ### Claim 6 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the second region comprises more than 10% by weight of each of two alkali metal and/or alkaline earth metal nutrients. ### Claim 7 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the second region comprises more than 10% by weight of each of three alkali metal and/or alkaline earth metal nutrients. ### Claim 8 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the polyhalite is capable of providing (a) two or more alkali metal and/or alkaline earth metal nutrients and (b) sulphur. ### Claim 9 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the second region comprises more than 15% by weight of sulphur. ### Claim 10 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the second region comprises more than 15% by weight of sulphur in the form of sulphate. ### Claim 11 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the second region contacts the first region over substantially the whole of its interface to the first region. ### Claim 12 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the second region comprises a powder of polyhalite, and wherein the powder has a grain size in a range from about 50 μm to about 500 μm. ### Claim 13 (depends on 1) A fertiliser product comprising a plurality of pellets as claimed in claim 1. ### Claim 14 (depends on 1) A pelletised fertiliser product wherein at least 50% of the pellets are pellets as claimed in claim 1. ### Claim 15 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the first region comprises urea. ### Claim 16 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the first region comprises an ammonia-based composition or a nitrate-based composition. ### Claim 17 (depends on 1) A fertiliser pellet as claimed in claim 1, comprising a layer of binder or adhesive between the first region and the second region. ### Claim 18 (depends on 1) A fertiliser pellet as claimed in claim 1, wherein the volume of the second region is between 50% and 100%, 75% and 150%, or 100% and 200% of the volume of the first region. ### Claim 19 (depends on 1) A fertiliser pellet as claimed in claim 1, comprising a component having the effect of chemically and/or mechanically stabilising and/or preserving the pellet. ### Claim 20 (depends on 1) A fertiliser pellet as claimed in claim 1, comprising a coating over the exterior of the second region. ### Claim 21 (depends on 20) A fertiliser pellet as claimed in claim 20, wherein the coating is a sealant or a lubricant. ### Claim 22 (depends on 1) A method of forming the fertiliser pellet as claimed in claim 1, the method comprising tumbling a pellet of nitrogen-providing fertiliser composition with a mixture of polyhalite and a binder. ### Claim 23 (depends on 22) A method as claimed in claim 22, wherein the binder is starch. ### Claim 24 (depends on 22) A method as claimed in claim 22, wherein the tumbling is performed using a horizontal or sloping rotary drum mixer, or a pan pelletiser.