Salt Processing with Hydrocyclones

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The use of Hydrocyclones in the processing of rock salt has been proven over many years. The raw material is crushed mechanically and then soaked in water. Nonsoluble particles are separated. The larger (> 3 mm) by screen and the finer ones (< 2mm) by mbb hydrocyclones, so that a pure clean slurry of > 45 μm (or smaller) is achieved. To separate salt from the cleaned slurry, water has to be removed. A natural method of removing the salt is to put the slurry into a basin and leave the water to be evaporated by the sun. In small plants heat exchangers are used. At a certain point after decreasing the temperature and cooling down the slurry, crystals will form which are heavier than the slurry. The separation of the crystals is possible by normal gravity (1 g) in basins or sheds, but this requires a large area and a long residence time. Hydrocyclone technology, which operates with g-forces between 100 and 3000, is faster and requires far less space. Hydrocyclone technology is also suitable for separating fine stone particles from de-icing salt liquids in order to avoid blockage of fine spray nozzles. An increasing number of winter road services are using more and more liquid salt in order to reduce costs and the amount of raw salt required. For this application it is important to reach a cut point of 15-20 μm in order to remove insoluble particles from the slurry, which otherwise would cause blockage of the nozzles. The use of very fine spray nozzles allows the operator to reduce the deicing salt by 50 % or more. The communal street service Autobahnmeisterei in Mendig (Rheinland/Pfalz), Germany, is already using this technology in its first pilot plant and has ordered a second one. The raw salt has an insoluble content of ca. 0,7 %, in a single step system

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