AT8079B - Method of cleaning Soole. - Google Patents

Description

  

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  Method of cleaning Soole.



     The present invention relates to the cleaning of brine, which is obtained from the Salt Monopoly Administration or with its approval and for industrial purposes, with the exclusion of all purposes and operations reserved for the salt monopoly,
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   Soolo dissolved existing calcine sulphates (Gyps), whereby the ammonium sulphate formed remains in the mother liquor and this is returned to the plant to purify a further amount of Soole. Before the treatment with ammonium carbonate, the brine is freed from its content of other sulfates, magnesium salts and calcium salts
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 these exclude the presence of calcium compounds such as calcium chloride, calcium bromine, calcium iodine and the reverse is also the case.



   Taking these relationships into account, a Soole can be almost as follows
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 Calcium sulfate (Gyps) implemented. The latter fails because every naturally occurring Soole is already saturated with Gyps.
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   of these two reactions. incidental, both can also be carried out at the same time. In any case, the result is a gypsy-saturated to Soo! e. Carbonate of ammonia is now added to it in an amount which corresponds to the calcium content of the brine
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   The latter is now evaporated or rather concentrated until about. 81% of the original volume has evaporated and a corresponding amount of salt
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All of the ammonia salt is in the mother liquor, which is about 1 / o of the original amount of brine; it becomes a new portion of soole,
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 of carbonic acid, while boiling gives a precipitate of carbonated lime. It is then completely free of lime and is evaporated with subsequent use of the mother liquor as described above.



   In this way it is possible to purify unlimited quantities of gypsums and magnesium salts with a single purchase of ammonia salt and constant purchase of lime. Of course, instead of using carbonate of ammonia for the first time, another ammonia salt, e.g. B. (Take NHV2 2 S04 and convert this into carbonate of ammonia by means of lime and carbonic acid, which then (as described for the use of mother liquor) has a lime-precipitating effect.



   The cleaning of the Soole from Schweizerhalle serves as an example, in which example the cleaning is carried out using ammonia sulfate.



     250 tM Soole are burned with 772 kg. Lime added, of which 135 kg are used for the precipitation of magnesium salt, calcium bicarbonate and free carbonic acid, and 637 kg for the conversion of the 1) 00 kg ammonium sulfate added at the same time.



   After a few hours of stirring, the mixture is left to settle and the salt is filtered. Then it is treated with carbonic acid until a sample gives no precipitate either when it is further introduced or when it is boiled.



   The brine filtered from the carbonate of lime is evaporated down to approx. 40 m3 and the mother liquor, which now contains approx. 37 kg of ammonium sulphate per m3, is combined with fresh brine and lime instead of sulfuric ammonia.

 

Claims (1)

PATENT CLAIM: Ancestors for the purification of Soole, which is obtained from the salt monopoly administration or with their approval and is to be processed for industrial purposes, excluding all purposes and operations reserved for the salt monopoly, consisting in the fact that the Hall (in the Soole is covered by carbonate of ammonia, in that this is either added to the brine or produced in the socle itself from an ammonia salt, quicklime and carbonic acid, with constant use of the mother liquor instead of the ammonia salt. At the same time or beforehand, magnesium salts are converted into insoluble magnesium hydrate by means of caustic lime and easily soluble lime salts, be it that these are already present in the brine or have arisen through the action of the caustic lime, are converted into gypsium and table salt by adding an equivalent amount of sodium sulfate .