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A kind of preparation method of food grade magnesium chloride

A magnesium chloride, food-grade technology, applied in the field of food chemistry, can solve the problems of high production cost and large process energy consumption.

Active Publication Date: 2021-03-23
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the brine is concentrated by means of forced evaporation, which makes the process consume a lot of energy and the production cost is high

Method used

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  • A kind of preparation method of food grade magnesium chloride

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preparation example Construction

[0024] The embodiment of the present invention provides a kind of preparation method of food grade magnesium chloride, such as figure 1 Shown, described preparation method comprises steps:

[0025] S101. Evaporate the old brine from the salt lake in the salt pan to obtain the first brine with a specific gravity of 1.343-1.346.

[0026] In a preferred scheme, the old salt lake brine is the industrial tail liquid produced in the salt lake brine potassium extraction process, and the main chemical composition of the industrial tail liquid is: magnesium ions 105-110g / L, calcium ions 14-15g / L L. Chloride ion 350~360g / L, lithium ion 85~92mg / L, boron trioxide 650~700mg / L.

[0027] In a preferred solution, the old brine from the salt lake is evaporated in a salt pan to obtain the first brine with a specific gravity of 1.343-1.346.

[0028] It should be noted that after the specific gravity of the old brine in the salt lake evaporated to 1.345, magnesium chloride began to precipitate,...

Embodiment 1

[0039] (1) Obtain the industrial tail liquid produced in the salt lake brine potassium extraction process, that is, the old brine of the salt lake, and introduce the old brine into the salt pan for evaporation to form the first brine with a specific gravity of 1.343. The main chemical composition of the industrial tail liquid in this embodiment is: magnesium ion 105g / L, calcium ion 14g / L, chloride ion 350g / L, lithium ion 85mg / L, diboron trioxide 650mg / L.

[0040] (2) The first brine is introduced into the heat storage evaporation pool to continue to evaporate, and when the temperature of the brine in the heat storage evaporation pool reaches 45°C and there is bischofite solid phase deposition, the brine is drawn out to form the second brine. Wherein, the thermal storage evaporation pool in this embodiment is made of iron material, its outer wall is painted black, and a black geomembrane is laid inside the pool as a liner.

[0041] (3), the second brine is sent to the crystalli...

Embodiment 2

[0047] (1) Obtain the industrial tail liquid produced in the salt lake brine potassium extraction process, that is, the old brine of the salt lake, and introduce the old brine into the salt pan for evaporation to form the first brine with a specific gravity of 1.344. The main chemical composition of the industrial tail liquid in this embodiment is: magnesium ion 110g / L, calcium ion 15g / L, chloride ion 360g / L, lithium ion 92mg / L, diboron trioxide 700mg / L.

[0048](2) The first brine is introduced into the heat storage evaporation pool to continue to evaporate, and when the temperature of the brine in the heat storage evaporation pool reaches 55° C. and there is bischofite solid phase deposition, the bottom brine is drawn out to form the second brine. Wherein, the thermal storage evaporation pool in this embodiment is set as a deep-water salt pan with a depth of 4.5 meters, and a high-density polyethylene film is also laid in the pool of the deep-water salt pan as a liner.

[00...

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Abstract

The invention discloses a preparation method of food-grade magnesium chloride. The preparation method includes: steaming salt lake brine in a salt pan to obtain first brine with proportion ranging from 1.343-1.346, leading the first brine into a heat storage evaporation pond, steaming continuously till solid phases of bischofite deposit at the bottom of the heat storage evaporation pond, leading the first brine in the heat storage evaporation pond out to form second brine, subjecting the second brine to heat-preserved filtering, delivering to a crystallizing pond, separating out magnesium chloride crystals by cooling, performing solid-liquid separation to obtain solid-phase products, and washing and drying the solid-phase products to obtain the food-grade magnesium chloride. The preparation method of the food-grade magnesium chloride has the advantages that energy consumption of a food-grade magnesium chloride preparation technology can be reduced, and production cost can be saved.

Description

technical field [0001] The invention belongs to the technical field of food chemistry, in particular to a preparation method of food-grade magnesium chloride. Background technique [0002] As an additive, edible magnesium chloride (MgCl 2 ·6H 2 O) has comparatively wide application in soya-bean industry, is generally the bittern that seawater obtains through drying salt as the raw material of preparing food-grade magnesium chloride at present. [0003] Salt lake brine also contains abundant magnesium resources, which can also be used as another important raw material for the preparation of food-grade magnesium chloride. Qinghai is one of the most important salt lake distribution areas in my country. Among them, Chaerhan Salt Lake in the Qaidam Basin is the earliest potash fertilizer base developed in my country. With the continuous expansion of potassium chloride production scale, the by-product old brine is increasing , the magnesium resource in the old brine is large and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/30
CPCC01F5/305C01P2006/80
Inventor 杨红军王敏
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI