1. Kieselguhr, (hyflosupercel), washed in acid.

2. Mining of fossil silica and kieselguhr; preparation of bricks and proofings of these materials

3. These are often incompressible diatomaceous earth, or kieselguhr, which is composed primarily of silica.

4. After dilution with water, the cosmetic is adsorbed onto a kieselguhr column and extracted with n-butanol.

5. use of absorbant material (e. g. sand, kieselguhr, acid binder, universal binder, sawdust . . .) reduction of gases/fumes with water, dilution.

6. The cell-free extract was produced by combining dry yeast cells, quartz and kieselguhr and then pulverizing the yeast cells with a pestle and mortar.

7. 25 L-type molecular sieves were synthesized with four different silicious materials, namely silica sol, silica gel, waste silica sludge and kieselguhr.

8. Activated kieselguhr and other activated natural mineral products; animal black, whether or not spent (excl. activated carbon, calcinated diatomite without the addition of sintering agents and activated chemical products)

9. The invention relates to an agent for purifying gases and exhaust gases, consisting of A) porous, acid-resistant, inorganic substances such as brick dust or kieselguhr; B) inorganic and/or organic acids which have been absorbed by the porous, acid-resistant, inorganic substances; C) surface-active substances; and possibly D) basic substances.