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A kind of preparation method of magnesium sulfate heptahydrate

A technology of magnesium sulfate heptahydrate and bischofite, which is applied in the direction of magnesium sulfate, can solve the problems of high impurity ion content and high reaction energy consumption, and achieve the effect of simple process flow, simple reaction process and convenient operation

Active Publication Date: 2019-12-06
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The magnesite method adopts the reaction of sulfuric acid and magnesite to produce magnesium sulfate, which requires high energy consumption and high content of impurity ions

Method used

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  • A kind of preparation method of magnesium sulfate heptahydrate

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Comparison scheme
Effect test

Embodiment 1

[0026] A, Glauber's salt and bischofite are proportioned according to the mass ratio of 1:3.6, add water to dissolve, control the water content of the system to be 72.2%, and obtain the first solution;

[0027] B, the insoluble matter of the first solution is removed by filtration;

[0028] C. Freeze the filtered first solution, control the freezing temperature to 0° C., and freeze for 72 hours to crystallize magnesium sulfate heptahydrate to obtain the second solution.

[0029] D. Evaporate the second solution to obtain sodium chloride, and the evaporated water is 40%.

[0030] Sulfate root freezing out rate is 28.6%, heavy metal ion is not detected in magnesium sulfate heptahydrate, potassium ion content is 0.02%, boron ion content is 0.008%, chloride ion content is 0.5%, sodium ion content is 0.21%, heptahydrate The magnesium sulfate content is 99.20%. The frozen mother liquor evaporates 40% of the water, and the sodium chloride precipitation rate is 92%, wherein the cont...

Embodiment 2

[0032] A, Glauber's salt and bischofite are proportioned according to the mass ratio of 1:7.8, add water to dissolve, control the water content of the system to be 66%, and obtain the first solution;

[0033] B, the insoluble matter of the first solution is removed by filtration;

[0034] C. Freeze the filtered first solution, control the freezing temperature to -20° C., and freeze for 12 hours to crystallize magnesium sulfate heptahydrate to obtain the second solution.

[0035] D. Evaporate the second solution to obtain sodium chloride, and the evaporated water is 30%.

[0036] The freezing-out rate of sulfate radicals was 46.2%, no heavy metal ions were detected in the magnesium sulfate heptahydrate, and the content of chloride ions was 1%. When the washing amount is 13% of the quality of magnesium sulfate heptahydrate, the content of potassium ion in magnesium sulfate heptahydrate is 0.007%, the content of boron ion is 0.008%, the content of chloride ion is 0.15%, the cont...

Embodiment 3

[0038] A, Glauber's salt and bischofite are proportioned according to the mass ratio of 1:5, add water to dissolve, control the water content of the system to be 74%, and obtain the first solution;

[0039] B, the insoluble matter of the first solution is removed by filtration;

[0040] C. Freeze the filtered first solution, control the freezing temperature to -10°C, and freeze for 24 hours to crystallize and precipitate magnesium sulfate heptahydrate to obtain the second solution.

[0041] D. Evaporate the second solution to obtain sodium chloride, and the amount of evaporated water is 20%.

[0042] The mass ratio of Glauber's salt to bischofite was selected as 1:5, the freezing temperature was -10°C, the water content of the system was controlled at 74%, and after freezing for 24 hours, the sulfate radical freezing rate was 50.6%, which was not detected in magnesium sulfate heptahydrate Heavy metal ions, chloride ion content is 0.45%. When the washing amount is 25% of the ...

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Abstract

The invention provides a preparation method of magnesium sulfate heptahydrate. The preparation method comprises the following steps: A, preparing mirabilite and bischofite according to the mass ratioranging from (1 to 1.5) to (1 to 8); adding water and dissolving; controlling the water content of a system to be 60 percent to 80 percent to obtain a first solution; B, filtering and removing insoluble matters of the first solution; C, freezing the filtered first solution and controlling the freezing temperature to -30 DEG C to 5 DEG C and the freezing time to 6h to 72h; crystallizing to separateout magnesium sulfate heptahydrate, so as to obtain a second solution. The preparation method is a green novel technology and has the advantages of low raw material cost, simple flow, convenience foroperation and no need of recrystallization and water washing; the purity of the prepared magnesium sulfate heptahydrate and sodium chloride is high.

Description

technical field [0001] The invention relates to a preparation method of magnesium sulfate heptahydrate, in particular to a new green process for preparing magnesium sulfate heptahydrate and co-producing sodium chloride by using crude thenardite and bischofite by-products in salt lakes. Background technique [0002] Magnesium sulfate is an important inorganic chemical raw material widely used in industry and agriculture. Magnesium sulfate contains sulfur and magnesium, two essential nutrients for crops, which can not only increase the yield of crops, but also improve the quality of fruits. [0003] Salt lakes contain elements such as potassium, sodium, and magnesium, and are an important treasure house of resources in my country. Using the principle of phase separation, the rock salt and potassium salt in the salt lake can be separated through the salt pan process. The old brine after potassium extraction is a saturated solution of magnesium chloride. Further evaporation an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/40
CPCC01F5/40C01P2006/80
Inventor 魏明王敏钟远杨红军
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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