DE405457C - Process for the production of potash nitrate from crude potash salts - Google Patents

Description

Process for the production of potash nitrate from crude potash salts. In the Patent specification 401479 is a version of the specification originally given in patent specification 335819 '"has been described for the production of potash nitrate from crude potash salts. In this case, the amount required to produce the desired amount of potassium nitrate is required ': @Iagnesiuinnitr: atlatige partly slammed into the final nitric liquor to get into .this Mixture can be used as a loosening eye, and sometimes it is used to avoid '' a NaCI, @ excretion only after leaching, the Kaliroli, silze the hot nitric solution separated from the residue was added. In this case it can they are used to absorb the potassium chlorine that is added to the lye cycle is withdrawn in the second crystallization in the artificial carnallite and that the Procedure before! Excretion; the potassium nitrate must be added.

From the solution residue remaining during the treatment of the crude salt Finally, the undissolved kieserite is separated, uni according to the in patent 32103o described circulatory process converted into magnesium nitrate to become.

The method is often used to avoid kieserite washes patent 166187. Here the kieserite is essentially unrelated to ordinary Water, but rather finitely rather saturated alkaline solutions. To the full To avoid saturation of the lye to be separated off, this must be finite from time to time Water to be diluted. On the other hand, for dechlorination a lot of N.aCI. accumulating kieserite sludge to be supplied with fresh water, which of course in both cases correspond to an exit ler amounts of kieserite liquor leads.

It has been found that in the context of the method according to patent 401479 can work without such wastewater.

For the dechlorination of the kieserite, that part of the magnesium nitrate liquor is brought into the veneer which is to be added to the final nitric liquor for the purpose of forming: the dissolving liquor. The saltpeter solution can be seen in the treatment of the crude salts per se with sodium chloride, so that it is irrelevant whether the magnesium nitrate solution used as an additive was previously saturated with it. A Mg (NO @), - lye still absorbs appreciable amounts of table salt. B. 30o g (N03), about 200 g \ aCl are absorbed per liter. What she solves at the same time in MI-S04 cannot be lost in the process either, since the clear nitric solution can be treated again with C'a (NO,) _ before crystallization.

The amounts of lye that are released from time to time by the separating lye are used to wash away the residue to remove it.

Claims (1)

PATENT CLAIMS: t. Process for the production of potash nitrate from crude potash salts according to patent d.ol d .; 9, characterized in that the at the Magnesium nitrate liquor used in crude salt treatment beforehand for dechlorination used by kieserite. a. Process for the production of potash nitrate from crude potash salts according to patent 401479, characterized in that for washing out the solution residue the lye separating the kieserite is used.