FIELD: process engineering.
SUBSTANCE: invention relates to concentration of siliceous rocks. It may be used in food, pharmaceutical and chemical industries for making of filtration material, or in construction as an additive for production of mortars, concretes and dry construction mixes. Proposed method comprises diatomite preparation, extraction of target fraction, grinding and acid treatment under boiling conditions. Additionally, extracted target fraction is annealed in boiling bed furnace at 550-900°C for 20-360 s. Said target fraction is separated mechanically by centrifugal and vibration forces. Acid treatment is carried out along with mixing for 20-30 min at acid concentration of 0.1-0.5 H. Hydrochloric or sulphuric acid is used to this end.
EFFECT: higher efficiency of separation, required quality of diatomite, decreased content of harmful impurities.
2 cl, 1 dwg, 2 tbl, 18 ex
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