Method of preparing low sodium carnallite by blending halogen

A technology of carnallite and carnallite, which is applied in the direction of magnesium halide, alkali metal chloride, magnesium chloride, etc., can solve the problem of no industrial application prospect, rising cost of low-sodium carnallite, and increasing consumption of bischofite. Large and other problems, to achieve the effect of broad prospects for industrial application, low production costs, and excellent product quality

Active Publication Date: 2006-03-29
BLUESTAR LEHIGH ENG INST CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires the bischofzite to be relatively pure, that is, the content of NaCl and insolubles in the bischoftite is relatively small, otherwise the bischnite needs to be dissolved separately to the required Baume degree, and then the insolubles are removed, and the The clear liquid is then mixed with the brine at the point of carnallite to obtain low-sodium carnallite, which makes the process more complicated
And when the bicholorite is dissolved to the required Baume degree, if you want to remove the insoluble part, it will inevitably cause the loss of the clear liquid (caused by the higher content of the adsorption mother liquor after filtration), thus causing the magnesium bichloride The consumption of carnallite increases, the cost of low-sodium carnallite increases, and there is no prospect of industrial application

Method used

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  • Method of preparing low sodium carnallite by blending halogen

Examples

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Effect test

Embodiment 1

[0016] Example 1. A method for preparing low-sodium carnallite by mixing brine. The bischofite obtained by drying on the beach in salt fields and evaporating naturally and unsaturated old brine is mixed in a brine mixing container until the mixture of bischofite and unsaturated old brine Magnesium ion Mg ++ The percentage content of carnallite is 8.0%; then add carnallite point brine to the mixture to carry out the halogen crystallization reaction, and filter to obtain low-sodium carnallite; wherein, the composition of the added carnallite point brine is potassium ion K + The percentage content is 0.5%, magnesium ion Mg ++ The percentage content of is 5.0%; The weight ratio of mixture and carnallite point brine is 1:1.

Embodiment 2

[0017] Example 2. A method for preparing low-sodium carnallite by mixing brine. The bischofite obtained by drying on the beach in salt fields and evaporating naturally and unsaturated old brine is mixed in a brine mixing container until the mixture of bischofite and unsaturated old brine Magnesium ion Mg ++ The percentage content of carnallite is 8.5%; then add carnallite point brine to the mixture to carry out the halogen crystallization reaction, and filter to obtain low-sodium carnallite; wherein, the composition of the added carnallite point brine is potassium ion K + The percentage content is 0.8%, magnesium ion Mg ++ The percentage content of is 7.7%; The weight ratio of mixture and carnallite point brine is 3:1.

Embodiment 3

[0018] Example 3. A method for preparing low-sodium carnallite by mixing brine. The bischofite obtained by drying on the beach in salt fields and evaporating naturally and unsaturated old brine is mixed in a brine mixing container until the mixture of bischofite and unsaturated old brine Magnesium ion Mg ++ The percentage content of carnallite is 8.3%; then add carnallite point brine to the mixture to carry out the halogen crystallization reaction, and filter to obtain low-sodium carnallite; wherein, the composition of the added carnallite point brine is potassium ion K + The percentage content is 0.6%, magnesium ion Mg ++ The percentage content is 6.0%; the weight ratio of mixture and carnallite point brine is 2:1; the weight ratio of unsaturated old brine and bischofagsite is 3:1; the unsaturated old brine and carnallite point After the brine is added to the brine mixing container, it is fully mixed and continuously stirred for 0.5 hours; the finished brine mixing solution...

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Abstract

A process for preparing low-Na carnallite by removing halogen includes such steps as sunning in salt field for natural evaporating to obtain bischofite, mixing it with unsaturated brine, stirring until the content of Mg ions is not less than 8%, adding carnallite, dehalogenating-crystallizing reaction, and filtering.

Description

technical field [0001] The invention relates to a method for preparing carnallite, in particular to a method for preparing low-sodium carnallite by a brine mixing method. Background technique [0002] In the prior art, the Chinese patent application whose application number is 92107304.6 discloses "a new method for producing potassium chloride from chloride containing potassium brine", which uses carnallite point brine and bischofite point brine in a weight ratio of 1: 1---1:3 blending, fully stirring and reacting for more than 15 minutes, the obtained artificial carnallite and sodium chloride are graded and desodiumized according to the difference in particle size. The deficiencies in the patented technology of this invention are: the magnesium chloride content in the bischofzolite brine does not meet the process requirements in the low temperature season, and the recovery rate of potassium chloride in the carnallite produced by mixing the brine is obv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01F5/30
Inventor 宋文义葛兆民
Owner BLUESTAR LEHIGH ENG INST CO LTD
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