FIELD: chemistry.
SUBSTANCE: invention relates to chemical engineering for nitric-acid processing phosphate material to obtain calcium carbonate by converting calcium nitrate during production of NPK fertiliser. The method producing calcium carbonate involves: reaction of calcium nitrate with ammonium carbonate solution, extracting the residue of the end product from the suspension, washing said residue, thermal treatment at temperature 400…700°C and grinding.
EFFECT: invention simplifies the technology of processing calcium carbonate - a by-product of production of NPK fertiliser, into filler for use in different industries.
2 cl, 2 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PRODUCING LIME-AMMONIUM NITRATE | 2015 |
|
RU2614874C2 |
| AMMONIUM NITRATE-BASE COMPLEX FERTILIZERS AND METHODS FOR THEIR PREPARING | 2003 |
|
RU2237046C1 |
| METHOD OF PRODUCING GRANULAR COMPOUND FERTILISER | 2009 |
|
RU2407721C1 |
| CALCIUM CARBONATE PRODUCTION PROCESS (OPTIONS) | 2005 |
|
RU2281921C1 |
| GRANULATED CALCIUM CARBONATE PRODUCTION PROCESS | 2005 |
|
RU2299856C1 |
| PHOSPHOR-POTASSIUM-NITROGEN-CONTAINING NPK-FERTILISER AND METHOD OF PRODUCING GRANULATED PHOSPHOR-POTASSIUM-NITROGEN-CONTAINING NPK-FERTILISERS | 2016 |
|
RU2628292C1 |
| PHOSPHORUS-POTASSUIM-NITROGEN-CONTAINING NPK-FERTILISER AND METHOD FOR PRODUCING GRANULATED PHOSPHORUS-POTASSUIM-NITROGEN-CONTAINING NPK-FERTILISER | 2016 |
|
RU2626947C1 |
| METHOD FOR PREPARING COMPLEX FERTILIZERS | 2003 |
|
RU2230718C1 |
| METHOD AND MECHANISM FOR SULFUR-CONTAINING NITROGENOUS FERTILISERS PRODUCTION | 2005 |
|
RU2400459C2 |
| METHOD OF PRODUCTION OF A COMPLEX CALCIUM-CONTAINING FERTILIZER WITH A CONTROLLED RATIO OF Ca:PO | 2004 |
|
RU2261234C1 |
