Kieselguhr for filtration

Kiselgur is a sedimentary rock consisting of the remains of diatoms. This name has German roots. The word "diatomite" is synonymous with diatomaceous earth, it is used by representatives of English-speaking countries, as well as in the United States. The term kieselguhr is more typical for the post-Soviet space. Based on what vendors call material, you can understand where it was mined.

Ancient unicellular algae, which form the basis of diatomaceous earth, existed on Earth millions of years ago, gradually settling on the bottom of water bodies and forming a sedimentary rock. The basic composition is silicon dioxide. Due to the excellent adsorbing properties of diatomite, it is often used for filtration. In this process, the high porosity of diatomaceous earth is particularly important.

The process of kieselguhr development

The development of diatomaceous earth is carried out in quarries of open type. Then the diatomite is fired. After calcination, the diatomaceous earth is further washed to separate the coarse and fine diatomite (a 2-3 mm thick layer, i.e., smaller fractions). For filtration, a thin diatomaceous earth is used.

Sometimes, to improve the quality, the material is roasted with flux (sodium carbonate), this process is called calcination. This ensures the appearance of additional pores on the diatomaceous earth and an increase in its specific surface area. After calcination, the diatomaceous earth is fractionated on special separators.

Features of the adsorption properties of diatomaceous earth

The use of diatomite in filtration is due to the technological characteristics of the material. This substance can retain even the smallest particles, minimizing the throughput. Thus, on-line kieselguhr filters have found their application in the purification of water wells and artesian wells. In addition, they are often used to filter water in aquariums.

In addition, kieselguhr refers to chemically neutral and water-insoluble elements. During the cleaning process, the diatomite is mixed with other suspended particles and stops on the precoat layer.

As you know, unfiltered beer looks like a muddy liquid of incomprehensible color. A pleasant pearl shade of the drink gets after cleaning, which often occurs when using diatomite. Coarse and fine diatomaceous earths, in turn, are washed in two layers of water on a base plate, thus obtaining a layer 2-3 mm thick. Through this layer the beer is pounding. During filtration, fine diatomaceous earth is added to the stream to ensure that the process has moved to a higher level. This method also provides an update to the filter layer. Most types of beer today passes just such a filtration. In the end, the use of this technology avoids pasteurization, which has no better effect on the taste characteristics of the beer.

Areas of application of diatomite filters

Due to the fact that this material differs in size fractions, it becomes possible to use exactly the kind that is most suitable in this case. For example, different filtration ratings provide a filtration layer that is most suitable for a particular wine brand. In some diatom filter models, wine can be filtered, thereby reducing the percentage of beverage losses during production.

Diatomite filters are also used:

  • In pharmaceutics;
  • For syrups and juices;
  • In the chemical industry.

The use of diatomite for cleaning products can not disturb their taste qualities, they will remain unchanged. In addition, without kieselguhr it is impossible to produce certain types of antibiotics, paper, textiles and plastics.


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