The physicochemical properties and preparation methods of diatomite (1)

diatomite

[Physical and chemical properties] White, light yellow or beige powder, which is the sediment of paleontological diatom remains

[Preparation method] Diatomaceous earth is a porous biological siliceous rock formed through preliminary diagenesis after the remains of ancient single-celled lower plant diatoms are piled up

Commonly used purification method of modifying an acid leaching, scrubbing method, a baking method, a spin from the selective flocculation, gravity chromatographic separation the dry, hot mineral float method, like a modified microwave radiation

(1) Acid leaching method

This is one of the most widely used methods for preparing high-grade diatomite in China

(2) Scrub method

The scrubbing method is to soak the diatomaceous earth in water for 5-6 hours, and then add water and dispersant NaOH to make the slurry concentration reach 40%, and stir and scrub to separate the detrital minerals and clay minerals from the algae shells and precipitate them separately Sand coarse soil, suspended clay and selected diatomaceous earth

(3) Roasting method

Roasting can dehydrate the two hydroxyl groups in OH-Si-OH to form O-Si-O.

Related Links: Application of Clay and Its Modified Substances