FIELD: mineral fertilizers.
SUBSTANCE: invention relates to technology of manufacturing complex mineral fertilizers that can be used in processing of polyhalite raw materials. Polyhalite is decomposed with nitric acid, after which reaction mixture is neutralized with nitric acid and then with ammonia, filtered, and resulting precipitate is subjected to three-step countercurrent washing with water (returned into polyhalite decomposition stage) and filtrate is evaporated to produce fertilizer.
EFFECT: improved quality and yield of fertilizer, reduced amount of water to be evaporated.
1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCING COMPOUND FERTILIZER | 2015 |
|
RU2606920C2 |
| METHOD OF PRODUCING SCHOENITE | 2007 |
|
RU2373151C2 |
| METHOD OF PRODUCING POTASSIUM SULPHATE FROM POLYHALITE ORE | 2014 |
|
RU2566414C1 |
| PHOSPHORUS-POTASSUIM-NITROGEN-CONTAINING NPK-FERTILISER AND METHOD FOR PRODUCING GRANULATED PHOSPHORUS-POTASSUIM-NITROGEN-CONTAINING NPK-FERTILISER | 2016 |
|
RU2626947C1 |
| METHOD OF PRODUCING COMPLEX POTASSIUM-NITROGEN FERTILIZER | 0 |
|
SU850637A1 |
| METHOD OF PREPARING COMPLEX FERTILIZERS | 1999 |
|
RU2145316C1 |
| METHOD FOR OBTAINING COMPLEX MINERAL FERTILISERS FROM PHOSPHATE ORE AND PLANT FOR ITS IMPLEMENTATION | 2016 |
|
RU2634936C2 |
| 0 |
|
SU189876A1 | |
| PHOSPHOR-POTASSIUM-NITROGEN-CONTAINING NPK-FERTILISER AND METHOD OF PRODUCING GRANULATED PHOSPHOR-POTASSIUM-NITROGEN-CONTAINING NPK-FERTILISERS | 2016 |
|
RU2628292C1 |
| METHOD OF PREPARING COMPLEX FERTILIZERS | 1999 |
|
RU2162071C2 |
