FIELD: agriculture.
SUBSTANCE: method for acid processing of lean phosphate raw materials is that the raw materials are decomposed by the 10÷40% excess of 1.0÷5.6 molar nitric acid, into which 0.5÷50 moll. % of potassium sulfate at the ratio to CaO contained in the raw materials are added; the slurry obtained during the decomposition is filtered, the insoluble residue is removed. Both the decomposition process and the filtration process are carried out at the temperature of 10÷35°C.
EFFECT: invention allows to carry out the processing of lean phosphate raw materials with the minimization of iron and aluminium oxide impurities in the product due to carrying out the processes of nitric acid decomposition and acid suspension filtration at a relatively low ambient temperature.
3 tbl, 6 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR ACID TREATMENT OF POOR PHOSPHORITES | 2008 |
|
RU2389712C2 |
| METHOD OF ACID PROCESSING OF PHOSPHATE RAW MATERIALS | 2017 |
|
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| METHOD OF PREPARING COMPLEX FERTILIZERS | 1999 |
|
RU2162071C2 |
| METHOD OF PREPARING COMPLEX FERTILIZERS | 1999 |
|
RU2145316C1 |
| METHOD FOR PREPARING NITRIC ACID EXTRACT FROM VYATSKO-KAMSKY PHOSPHORITE | 2005 |
|
RU2288906C1 |
| METHOD OF PROCESSING VYATKA-KAMA PHOSPHORITE | 2000 |
|
RU2174968C1 |
| METHOD OF PREPARING NITRIC ACID SOLUTION OF RARE PHOSPHATE MATERIAL | 2008 |
|
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| METHOD FOR EXTRACTION OF MAGNESIUM COMPOUNDS FROM ORE CONTAINING CALCIUM PHOSPHATE | 2021 |
|
RU2768215C1 |
| METHOD OF PREPARING VAYTKA-KAMA PHOSPHORITE | 2000 |
|
RU2174969C1 |
| METHOD OF PRODUCTION OF THERMOPHOSPHATE | 2015 |
|
RU2604009C1 |
