PROCESSING METHOD OF POTASSIUM PRODUCTION WASTES Russian patent published in 2013 - IPC C22B11/00 C22B7/00 B03B7/00 

FIELD: metallurgy.

SUBSTANCE: processing method of potassium production wastes involves stage hydrocyclonage of wastes in the form of slurry pulp with separation of preliminary concentrate and pulp of tail ends. Then, dehydration, preliminary drying, granulation and drying of preliminary concentrate is performed so that concentrate is obtained. With that, hydrocyclonage is performed in four stages on 10, 7, 5 and 5-degree hydrocyclones with pulp temperature of 40÷50°C, under pressure of 3÷5 atm at the ratio of unloading-to-drain head pieces, which is equal to (1.14÷1.17):1. Granulate is dried at 150÷200°C. After drying is completed, granulate is annealed at the temperature of 650÷950°C so that roasted product is obtained. After preliminary concentrate is separated, pulp of tail ends is clarified, and thickened part is returned to the processing process to the first stage of hydrocyclonage.

EFFECT: maximum waste utilisation; final waste utilisation product can be used as complex fertiliser of prolonged action, which is ensured with peculiar features of its composition and the state gained during waste processing.

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