METHOD OF RHOMB SPAR DRY DRESSING Russian patent published in 2017 - IPC B07B9/00 

FIELD: mining.

SUBSTANCE: method of rhomb spar dry dressing includes drying, grinding, dust collection and deposition of pulverized dolomite from the aspiration air and waste drying gas, three-stage separation with separation of a mixture of coarse particle and micronized crushed dolomite, underground dolomite, directed to recycling stream for grinding operation after the first and third stages of the separation. In the second separation stage, carried out by adjustable aeroclassification from the mixture of coarse particle and micronized crushed dolomite, obtained after the first separation stage, additionally coarse particle and micronized crushed dolomite is separated. The coarse particle crushed dolomite is mixed with a mixture of coarse particle and micronized crushed dolomite recovered after the third separation stage. Micronized crushed dolomite obtained in the process of controlled aeroclassification is mixed with micronized dolomite precipitated during dust removal from aspiration air and waste drying gas. The total amount of micronized dolomite obtained over a controlled period of time is measured and if a reduction in the total amount of micronized dolomite in a mixture of coarse particle and micronized crushed dolomite is required, the screening grinding of the underground dolomite from the third separation stage is sent for further grinding in a roller mill, and if an increase in the total amount of micronized dolomite separated from a mixture of coarse particle and micronized crushed dolomite is required, screening grinding of underground dolomite from the third separation stage are carried out in impact crushers.

EFFECT: increased efficiency of separating the finely dispersed fraction from crushed dolomite.

1 dwg, 3 ex