In order to study the diatom composition and species in diatomaceous earth , diatom monomer and other symbiotic minerals were obtained by separation method, and corresponding methods were adopted according to different mineral combinations. The procedure for the separation of diatoms is continuous.
<1> Hydrostatic settlement The sedimentation velocity of different particle size and specific gravity minerals in static water is inconsistent, and the sedimentation material has the characteristics of layer distribution. First, the diatom particles are examined in rock flakes and broken to the corresponding particle size.
<2> acid was dissolved to remove other impurities diatomaceous earth, acid-soluble adopt different methods to increase the content of diatoms, diatomaceous earth iron-containing substance, different levels of calcium in general, to the use of H 2 S0 4 The method of removing iron from iron and HCl, the concentration of acid depends on the size of the mineral particles.
<3> Roasting The carbonaceous organic matter is burned and ashed, and the ferric iron is reduced to divalent iron with the participation of carbon. According to the test of carbonaceous diatomaceous earth in western Yunnan, the melting temperature is generally controlled at 600-900 ° C to ensure that the diatom is not damaged.
<4>Magnetic and electromagnetic removal of magnetic and electromagnetic minerals in diatomaceous earth<5> Ultrasonic cleaning separation The diatomaceous earth is passed through the above steps, and then placed in an alcohol solution to be separated and cleaned on a sonicator to exclude adhesion to silicon. The clay and pollutants on the surface of the algae increase the porosity of the diatom.
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