SU523870A1 - Method for processing polymineral potash ores - Google Patents

Description

one

This invention relates to the complex processing of polymineral potash ores,

A known method of processing polymineral potash ores is that the ore is dissolved in the mother liquor and the saturated liquor, after separation of the salt and clarification, is directed to the cooling and crystallization of chenite, followed by decomposition to potassium sulfate. The undissolved residue containing langbeinite, polygalet and halite is enriched by flotation using fatty acids, and the resulting flotation concentrate is dissolved in water. After clarification, saturated flj is crystallized from the saturated langbeinite liquor.

The disadvantages of this method are the low degree (64-66%) of potassium recovery, as well as the need for secondary flotation.

There is also a known method for processing polymineral potash ores by dissolving the latter in uterine alkalis and separating the undissolved residue. The latter is subjected to flotation and the resulting flotation concentrate is dissolved in water at 90 ° C, with the release of halite 2 from it.

The disadvantage of this method is also the need for secondary flotation with the use of fatty acids, which, upon further processing of liquor, cause strong foaming.

In order to eliminate this drawback, a method has been proposed, according to which the undissolved residue is cooled before treatment with water by mixing with tail liquor. In this case, treatment of the undissolved residue with water is carried out at 18-25 ° C for 2-3 minutes.

The proposed method can eliminate the flotation of the undissolved residue.

Claims (2)

In addition, the cooling of the undissolved residue to ZO C allows the process of rapid dissolution of halite at 18-25 ° C, since at a low temperature potassium-magnesium minerals saturate halite liquor much less, and consequently, the brines get less contaminated potassium and magnesium salts. . The degree of extraction of potassium and magnesium in the proposed method is 75% and 76%, respectively, which is 11% and 10% higher than that known. Example. UOkg ore is dissolved in the mother liquor at 70 ° C. In this way, 340 kg of saturated liquor and 50 kg of undissolved residue containing langbeinite, halite are obtained. Saturated liquor is clarified and fed to cooling and crystallization. The thickened chenite is filtered and, after drying, sent as a finished product or sent for decomposition to potassium sulfate. The undissolved residue is mixed with 25 kg of tail liquor having a temperature of minus 4 plus 14 C. The residue cooled to 30 C is subjected to high-speed dissolution in 55 kg of water. The resulting langbein-polyhalite residue is filtered and dissolved in water. The clarified saturated langbeinite liquor is directed to the co-cooling and crystallization of the Shencte. Polygalite is launched as a finished product. After purification, the halite solution is sent to electrolysis by the diaphragm method to obtain chlorine and caustic. Formula 1. The method of processing polymineral potash ores by dissolving them, separating the insoluble residue and then extracting halite from it by water treatment, characterized in that, in order to increase the degree of potassium recovery and to simplify the process, the "not dissolved residue is cooled before treatment with water by displacing with tail liquor. 2. The method according to claim 1, that is, that the insoluble residue is treated at 18-25 ° C for 23 minutes.