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Preparation method of low-sodium salt

A low-sodium salt and potassium rock salt technology is applied in the preparation of low-sodium salt, and in the field of preparing low-sodium salt by mixing halogen-crystallization, which can solve the problems of uncontrollable particle size of low-sodium salt products and relatively strict temperature requirements. , to achieve the effect of low cost, controllable particle size and guaranteed product quality

Active Publication Date: 2021-12-07
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

For the preparation of low-sodium salt from salt lake resources, patent CN201710109056.4 provides a method for preparing low-sodium salt products that meet the requirements by adjusting the ratio of salt separation in the natural evaporation process for chloride-type salt lake brine; patent CN201810726693. 0 relies on sulfate-type salt lake brine and utilizes the climatic conditions in the Qaidam region in winter to remove sulfate radicals through the freezing process and prepare low-sodium salt products through natural evaporation; but the two are prepared for chloride-type and sulfate-type salt lake brine respectively Low-sodium salt, the process requires natural evaporation and freezing to remove sulfate, which has relatively strict requirements on temperature, and the particle size of the prepared low-sodium salt product is uncontrollable. In order to meet the product requirements, a process of impurity removal is required

Method used

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  • Preparation method of low-sodium salt
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preparation example Construction

[0023] Concretely, as an aspect of the technical solution of the present invention, the preparation method of a kind of low sodium salt that it relates to comprises:

[0024] Decomposing carnallite to obtain the first mother liquor and potassium halite solid;

[0025] mixing the potassium halite solid with fresh water to form a second mother liquor;

[0026] And, the second mother liquor and the magnesium source are mixed for reaction and crystallization to obtain low-sodium salt.

[0027] In some preferred embodiments, the preparation method specifically includes: mixing carnallite with fresh water for decomposition and filtration to obtain the first mother liquor and potassium halite solid, wherein the mass ratio of carnallite to fresh water is 1 : 0.9~1.2.

[0028] In some preferred embodiments, the chemical composition of the carnallite includes: K + 7.0~12.2wt%, Mg 2+ 6.9~8.6wt%, Cl - 36.0~46.2wt%, Na + 0~12.8wt%, H 2 O 27.1~43.3wt%.

[0029] And / or, recovering th...

Embodiment 1

[0051] Decompose and filter carnallite with fresh water to obtain mother liquor L1 and potassium halite solid S1;

[0052] Dissolve solid S1 and fresh water at a mass ratio of 1:2.2 to obtain mother liquor L2, wherein the chemical composition of S1 is: Na + 7.30wt%, K + 5.91wt%, Mg 2+ 0.56wt%, Cl - 17.99wt%; add in 15L crystallizer figure 2 Middle E point mother liquor (the chemical composition of E point mother liquor is: Na + 0.6~0.8wt%, K + 1.6~1.8wt%, Mg 2+ 5.9~6.6wt%, Cl - 21.4~22.3wt%, H 2 O 68.5~69.8wt%) is base liquid 15L, get 5.20kg L2, 5.90kg old bittern (Na + 0.33wt%, K + 0.03wt%, Mg 2+ 8.34wt%, C1-24.85wt%), while adding to the crystallizer at one time, after 30 minutes of reaction, it was filtered to obtain a low-sodium salt product with a KCl content of 22.88wt%. After sieving, its particle size distribution d>180 μm was 9.02 %, 7.21% for 150 μm<d<180 μm, and 82.1% for 125 μm<d<150 μm.

Embodiment 2

[0054] Decompose and filter carnallite with fresh water to obtain mother liquor L1 and potassium halite solid S1;

[0055] Dissolve solid S1 and fresh water at a mass ratio of 1:2.6 to obtain mother liquor L2, wherein the chemical composition of S1 is: Na + 8.00wt%, K + 5.78wt%, Mg 2+ 0.51wt%, Cl - 19.12wt%; add in 15L crystallizer figure 1 The mother liquid at point E in the center is 15L of base liquid. Take 8.90kg of L2 and 9.81kg of old brine respectively at the same time, adopt the two-way dropping method, feed time 1h, control the feeding speed with a peristaltic pump, add to the crystallizer, and filter after 30min of reaction. A low-sodium salt product with a KCl content of 26.81 wt% was obtained. After sieving, the particle size distribution of d>180 μm was 74.36 wt%, 150 μm<d<180 μm was 3.59 wt%, and 125 μm<d<150 μm was 7.76 wt%.

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Abstract

The invention discloses a preparation method of low-sodium salt. The preparation method comprises the steps of decomposing carnallite to obtain first mother liquor and sylvinite solid; mixing the sylvinite solid with fresh water to form second mother liquor; and mixing the second mother liquor and old brine, reacting and crystallizing to obtain the low-sodium salt. The preparation method provided by the invention is simple in process flow, low in energy consumption, low in cost, green and environment-friendly; and the prepared low-sodium salt product meets the requirements of the low-sodium salt QB / T2019-2020 standard, is high in purity and controllable in particle size, and has relatively strong market competitiveness.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt industry, and relates to a method for preparing low-sodium salt, in particular to a method for preparing low-sodium salt by adding halogen-crystallization. Background technique [0002] China's high-sodium diet has made hypertension one of the important diseases that threaten the health of the people. According to the fourth survey report on the nutrition and health status of Chinese residents, the risk of high blood pressure is higher among those who consume more than 18 grams of salt per day Increased by 27%. The latest nutritional survey results show that the daily salt intake of Chinese residents is as high as 12 grams, exceeding the World Health Organization recommended 5g. In 2017, the "National Nutrition Plan (2017-2030)" issued by the State Council proposed the goal of reducing the per capita daily salt intake of the whole people by 20% by 2030. In QB / T 2019-2020, the low-sodium sa...

Claims

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Application Information

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IPC IPC(8): C01D3/06C01D3/24
CPCC01D3/06C01D3/24
Inventor 赵冬梅张志宏付振海李志伟李成宝张世春苏彤
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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