GB822939A - Improvements in and relating to granular fertilizers based on urea - Google Patents
Improvements in and relating to granular fertilizers based on ureaInfo
- Publication number
- GB822939A GB822939A GB3556256A GB3556256A GB822939A GB 822939 A GB822939 A GB 822939A GB 3556256 A GB3556256 A GB 3556256A GB 3556256 A GB3556256 A GB 3556256A GB 822939 A GB822939 A GB 822939A
- Authority
- GB
- United Kingdom
- Prior art keywords
- calcium sulphate
- urea
- mixtures
- granulators
- drying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
- C05C9/005—Post-treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
A process for the production of urea based granular fertilizers having a nitrogen content in the range 30% to 46% by weight comprises charging a granulating device with substantially dry material comprising urea and a filler selected from calcined calcium sulphate and kieselguhr, mixtures of these or mixtures of at least one of these with ground limestone and, while continuing the granulation, simultaneously introducing into the granulator a concentrated aqueous solution of urea, and drying the granules produced at a temperature not exceeding 100 DEG C. The expression "calcined calcium sulphate" includes calcium sulphate hemihydrate soluble anhydrite and any intermediate hydrated calcium sulphate but not insoluble anhydrite. Various granulators may be used, e.g. drum granulators and ribbon mixers but preferably paddle mixers or granulators; it is also desirable to provide the granulator with heating means e.g. a steam jacket. The dry material in the initial mixture may comprise crushed over-size and fines drained from a previous operation. Suitable fillers for granular products of the invention having a nitrogen content of 40 to 46% are calcined calcium sulphate or kieselguhr or mixtures of these and for those with nitrogen contents of from 30 to 40% a filler comprising a major proportion of limestone. The moisture content of the granules during drying is reduced to 1% or less, and the drying is preferably carried out in a countercurrent stream of hot gasses. Specifications 624,642 and 717,195 are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3556256A GB822939A (en) | 1956-11-21 | 1956-11-21 | Improvements in and relating to granular fertilizers based on urea |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3556256A GB822939A (en) | 1956-11-21 | 1956-11-21 | Improvements in and relating to granular fertilizers based on urea |
Publications (1)
Publication Number | Publication Date |
---|---|
GB822939A true GB822939A (en) | 1959-11-04 |
Family
ID=10379121
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3556256A Expired GB822939A (en) | 1956-11-21 | 1956-11-21 | Improvements in and relating to granular fertilizers based on urea |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB822939A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1243213B (en) * | 1961-08-03 | 1967-06-29 | Armour & Co | Process for the production of grainy, nitrogenous fertilizers |
DE2512386A1 (en) * | 1975-03-21 | 1976-09-30 | Veba Chemie Ag | Process for the production of fertilizers with delayed delivery of nutrients |
GB2237800A (en) * | 1989-11-11 | 1991-05-15 | Willett & Son | Fertilizer particle and method of preparation |
WO2019016761A1 (en) * | 2017-07-21 | 2019-01-24 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
-
1956
- 1956-11-21 GB GB3556256A patent/GB822939A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1243213B (en) * | 1961-08-03 | 1967-06-29 | Armour & Co | Process for the production of grainy, nitrogenous fertilizers |
DE2512386A1 (en) * | 1975-03-21 | 1976-09-30 | Veba Chemie Ag | Process for the production of fertilizers with delayed delivery of nutrients |
GB2237800A (en) * | 1989-11-11 | 1991-05-15 | Willett & Son | Fertilizer particle and method of preparation |
WO2019016761A1 (en) * | 2017-07-21 | 2019-01-24 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
CN111051269A (en) * | 2017-07-21 | 2020-04-21 | 沙特基础工业全球技术公司 | Calcium sulfate urea granules and methods of making and using same |
US11299441B2 (en) | 2017-07-21 | 2022-04-12 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
US11352306B2 (en) | 2017-07-21 | 2022-06-07 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
US11802096B2 (en) | 2017-07-21 | 2023-10-31 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
US11912634B2 (en) | 2017-07-21 | 2024-02-27 | Sabic Global Technologies B.V. | Calcium sulfate urea granules and methods for producing and using the same |
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