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Preparation method of magnesium acetate (tetrahydrate)

A preparation process, magnesium acetate technology, applied in the field of magnesium acetate preparation, can solve the problems of increased landfill costs, low content, waste of resources, etc., and achieve the effects of saving preparation costs, simple preparation process, and low energy consumption

Inactive Publication Date: 2017-11-07
QINGHAI SALT LAKE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although magnesium hydroxide material is currently recognized as an excellent flame retardant material with triple functions of flame retardancy, smoke suppression and filling in the rubber and plastic industry, it is widely used in rubber, chemicals, building materials, plastics and electronics, unsaturated polyester and paints. , coatings and other polymer materials, but the magnesium hydroxide filter cake obtained in the process of extracting lithium from salt lake brine is usually used as a filler and flame retardant because of its low content, crystal morphology and dispersibility. It will be directly discarded, and the burial of a large amount of waste will not only increase the landfill cost but also cause a waste of resources

Method used

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  • Preparation method of magnesium acetate (tetrahydrate)
  • Preparation method of magnesium acetate (tetrahydrate)
  • Preparation method of magnesium acetate (tetrahydrate)

Examples

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Effect test

Embodiment 1

[0049] according to figure 1 The preparation process of a kind of magnesium acetate (Siheshui) shown comprises the following steps: first enter S1100 impurity removal, extract magnesium hydroxide material step: use the magnesium hydroxide filter cake formed in the process of extracting lithium from salt lake brine as raw material, The magnesium hydroxide filter cake is subjected to impurity removal treatment to extract the magnesium hydroxide material in the magnesium hydroxide filter cake, so that Cl in the magnesium hydroxide material - The mass fraction is below 0.01%.

[0050] according to figure 2 As shown, the impurity removal treatment of the magnesium hydroxide filter cake includes the following steps: first enter S1101 to form the first thick substance step: add water to the magnesium hydroxide filter cake, stir and mix to form the first thick substance . Then enter step S1102 to form a second thick substance: after heating the first thick substance to 40° C., sti...

Embodiment 2

[0054] according to figure 1 The preparation process of a kind of magnesium acetate (Siheshui) shown comprises the following steps: first enter S1100 impurity removal, extract magnesium hydroxide material step: use the magnesium hydroxide filter cake formed in the process of extracting lithium from salt lake brine as raw material, The magnesium hydroxide filter cake is subjected to impurity removal treatment to extract the magnesium hydroxide material in the magnesium hydroxide filter cake, so that Cl in the magnesium hydroxide material - The mass fraction is below 0.01%.

[0055] according to figure 2 As shown, the impurity removal treatment of the magnesium hydroxide filter cake includes the following steps: first enter S1101 to form the first thick substance step: add water to the magnesium hydroxide filter cake, stir and mix to form the first thick substance . Then enter step S1102 to form a second thick substance: after heating the first thick substance to 50° C., sti...

Embodiment 3

[0059] according to figure 1 The preparation process of a kind of magnesium acetate (Siheshui) shown comprises the following steps: first enter S1100 impurity removal, extract magnesium hydroxide material step: use the magnesium hydroxide filter cake formed in the process of extracting lithium from salt lake brine as raw material, The magnesium hydroxide filter cake is subjected to impurity removal treatment to extract the magnesium hydroxide material in the magnesium hydroxide filter cake, so that Cl in the magnesium hydroxide material - The mass fraction is below 0.01%.

[0060] according to figure 2 As shown, the impurity removal treatment of the magnesium hydroxide filter cake includes the following steps: first enter S1101 to form the first thick substance step: add water to the magnesium hydroxide filter cake, stir and mix to form the first thick substance . Then enter step S1102 to form a second thick substance: after heating the first thick substance to 40-50° C., ...

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Abstract

The invention discloses a preparation method of magnesium acetate (tetrahydrate). The preparation method comprises the following steps of: (S1100) steps of removing impurities and extracting magnesium hydroxide materials: by adopting magnesium-hydroxide filter cakes formed in a process of extracting lithium from salt lake brine as materials, removing impurities in the magnesium-hydroxide filter cakes so that magnesium-hydroxide materials in the magnesium-hydroxide filter cakes are extracted and the mass fraction of Cl<-> in the magnesium-hydroxide materials below 0.01%; (S1200) step of preparing magnesium acetate liquor: mixing the magnesium-hydroxide materials and the acetate solution according to the ratio of substances of the magnesium hydroxide and acetic acid of (1:2.1)-(1:2.2), generating neutralization reaction to form magnesium acetate solution; and (S1300) steps of crystallizing, separating and drying: treating the magnesium acetate solution adopting a crystallization procedure to form crystallized initiators of the magnesium acetate (tetrahydrate), and treating the crystallized initiators of the magnesium acetate (tetrahydrate) adopting separating and drying procedures to prepare the magnesium acetate (tetrahydrate) crystal.

Description

technical field [0001] The invention relates to the technical field of magnesium acetate preparation, in particular to a preparation process for producing magnesium acetate (Siheshui) crystals using waste magnesium hydroxide filter cake produced in the process of extracting lithium from salt lake brine. Background technique [0002] Magnesium acetate (tetrahydrate) is also known as magnesium acetate tetrahydrate, magnesium acetate tetrahydrate molecular formula C 4 h 6 o 4 Mg·4H 2 O, molecular weight 214.46 Soluble in water and ethanol. It is easy to deliquesce in humid air, easy to weather in sulfuric acid desiccator, and dehydrate when heated to 100°C. Soluble in cold and hot water. The solubility in 100mL water is 36.20g at 0.1°C, and 49.46g in 100mL water at 55°C. The aqueous solution is neutral or weakly acidic, and soluble in crystal water at 80°C. Deliquescence in humid air, weathering in concentrated sulfuric acid dryer, dehydration at 100°C. Used as chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/41C07C53/10
CPCC07C51/412C01F5/145C07C53/10
Inventor 刘林俊刘利德包庆山牛小慧
Owner QINGHAI SALT LAKE IND