阅读说明：本技术 基于合成硫酸镁的硫酸镁颗粒 (Magnesium sulfate granules based on synthetic magnesium sulfate ) 是由 G·鲍克 A·迪特里希 D·舍尔 L·沃尔德曼 于 2018-03-07 设计创作，主要内容包括：本发明涉及硫酸镁颗粒,包含相对于硫酸镁颗粒的总质量为至少90重量％的合成硫酸镁水合物且具有小于2重量％的干燥损失,干燥损失通过以下方法测定：将颗粒在105℃和1巴下干燥2小时。本发明还涉及生产所述硫酸镁颗粒的方法及其在含脲肥料组合物中的用途。(The invention relates to magnesium sulfate granules comprising at least 90 wt.% of synthetic magnesium sulfate hydrate relative to the total mass of the magnesium sulfate granules and having a drying loss of less than 2 wt.%, the drying loss being determined by the following method: the granules were dried at 105 ℃ and 1 bar for 2 hours. The invention also relates to a method for producing said magnesium sulfate granules and to the use thereof in urea-containing fertilizer compositions.)

1. Magnesium sulfate granules comprising at least 90 wt% of synthetic magnesium sulfate hydrate based on the total mass of the magnesium sulfate granules and having a drying loss of less than 2 wt%, the drying loss being determined by the following method: the granules were dried at 105 ℃ and 1 bar for 2 hours.

2. The magnesium sulfate granules of claim 1 having a total magnesium content of at least 26 wt.%, calculated as MgO and based on the total weight of the granules.

3. The magnesium sulphate particles according to claim 1 or claim 2 wherein the proportion of water soluble magnesium is from 20 wt% to 25 wt% based on the total mass of the magnesium sulphate particle and calculated as MgO.

4. The magnesium sulfate particles as claimed in any one of the preceding claims, wherein the proportion of water-insoluble magnesium is from 1.5% to 7.0% by weight, based on the total mass of the magnesium sulfate particles and calculated as MgO.

5. The magnesium sulfate granules as claimed in any one of the preceding claims, wherein the proportion of water of hydration, determined by loss on ignition at 550 ℃, is from 18% to 22% by weight, based on the total mass of the magnesium sulfate granules.

6. The magnesium sulfate granules of any one of the preceding claims wherein at least 90% by weight of the magnesium sulfate is in the form of magnesium sulfate monohydrate, based on the total mass of magnesium sulfate and water of hydration.

7. The magnesium sulphate granule according to any one of the preceding claims wherein the proportion of salts other than magnesium sulphate and magnesium oxide is less than 3 wt% based on the total mass of the magnesium sulphate granule.

8. The magnesium sulfate particles of any one of the preceding claims having an average crack resistance of at least 30N, the crack resistance being determined from particles having a particle size of from 2.5 to 3.15 mm.

9. The magnesium sulfate granules of any one of the preceding claims wherein at least 90 wt% of the granules have a particle size of 2-5 mm.

10. The magnesium sulfate particles as claimed in any one of the preceding claims obtainable by a process comprising:

i) digesting the magnesium oxide with an aqueous solution of sulfuric acid;

ii) granulating the reaction mixture obtained in the digestion by accumulating agglomeration to obtain magnesium sulfate particles; and

iii) drying the magnesium sulphate particles to a loss on drying of less than 2 wt%.

11. The magnesium sulfate granulate as claimed in claim 10, wherein the still hot reaction mixture obtained in the digestion is subjected directly to a cumulative agglomeration and, after the cumulative agglomeration, the resulting magnesium sulfate granulate is subjected to a maturation stage.

12. A process for the production of magnesium sulphate particles as claimed in any one of the preceding claims comprising

i) Digesting the magnesium oxide with an aqueous solution of sulfuric acid;

ii) granulating the reaction mixture obtained in the digestion by accumulating agglomeration to obtain magnesium sulfate particles; and

iii) drying the magnesium sulphate particles to a loss on drying of less than 2 wt%.

13. The process as claimed in claim 12, wherein the still hot reaction mixture obtained in the digestion is subjected directly to cumulative agglomeration and, after cumulative agglomeration, the resulting magnesium sulfate particles are subjected to a maturation stage.

14. Use of the magnesium sulfate granules of any one of claims 1 to 11 in the production of a solid urea-containing fertilizer composition.

15. A solid, free-flowing form of a fertiliser composition comprising magnesium sulphate particles as claimed in any one of claims 1 to 11 and urea in solid form.

16. A fertiliser composition as claimed in claim 15 comprising at least 60 wt% of a mixture of magnesium sulphate particles as claimed in any one of claims 1 to 11 and urea, based on the total mass of the fertiliser composition.

17. The fertilizer composition of claim 15 or 16, wherein the height ratio of magnesium sulfate particles to urea is from 2:1 to 1: 10.

18. The fertilizer composition of any one of claims 15-17, wherein urea is in the form of granulated or granular urea.

19. A method of producing a solid, free-flowing fertiliser composition as claimed in any of claims 15 to 18 comprising mixing magnesium sulphate particles as claimed in any of claims 1 to 11 with urea in solid form, especially urea prill or urea in the form of urea granules.