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Preparation method of magnesium sulfate heptahydrate

A technology of magnesium sulfate heptahydrate and sodium sulfate, applied in the direction of magnesium sulfate, etc., can solve the problems of production equipment corrosion, environmental pollution, and waste by-products, and achieve the effects of less equipment corrosion, less environmental pollution, and less waste

Active Publication Date: 2016-03-02
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

[0009] In order to solve the problems existing in the prior art, the invention provides a kind of preparation method of magnesium sulfate heptahydrate, to solve the problems of severe corrosion of production equipment, serious environmental pollution and many waste by-products in the existing method; and in the method The raw material resources are widely distributed and easy to obtain, which reduces the production cost of magnesium sulfate products

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  • Preparation method of magnesium sulfate heptahydrate

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in and described with reference to the drawings are merely exemplary, and the invention is not limited to these embodiments.

[0023] refer to figure 1 Process flow diagram, the preparation method of magnesium sulfate heptahydrate provided in the embodiments of the present invention mainly comprises steps:

[0024]Step A, sodium sulfate, magnesium chloride and fresh water are mixed according to the weight ratio of 1: (3-6): (1.5-3.5) and the ingredients are decomposed and transformed to obtain slurry I; wherein, the sodium sulfate can be Glauber's salt (Yuan Mingfen) or water-containing Glauber's salt; The magn...

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Abstract

The invention discloses a preparation method of magnesium sulfate heptahydrate. The preparation method comprises following steps: A, sodium sulfate, magnesium chloride, and fresh water are mixed at a weight ratio of 1:(3-6) :(1.5-3.5) for decomposition transformation so as to obtain a material slurry I; B, the material slurry I is subjected to thermal-insulation sedimentation and solid-liquid separation so as to obtain a liquid phase mother liquid I; C, the liquid phase mother liquid I is cooled to 10 to 15 DEG C for low temperature cold crystallization, and then is subjected to solid-liquid separation so as to obtain solid phase crude magnesium sulfate heptahydrate and a liquid phase mother liquid II; D, the solid phase crude magnesium sulfate heptahydrate and the liquid phase mother liquid II are subjected to slurry mixing and washing at a weight ratio of 1:(0.2-0.6) :(0.2-0.6) so as to obtain a material slurry II, the material slurry II is subjected to solid-liquid separation so as to obtain a solid phase refined magnesium sulfate heptahydrate wet product; and E, the solid phase refined magnesium sulfate heptahydrate wet product is dried so as to obtain magnesium sulfate heptahydrate.

Description

technical field [0001] The invention relates to the field of chemical industry, and relates to a preparation method of magnesium sulfate heptahydrate, in particular to a method for preparing magnesium sulfate heptahydrate by using magnesium chloride and sodium sulfate. Background technique [0002] Magnesium sulfate heptahydrate is an important inorganic chemical raw material, which is widely used in agriculture, industry, food, medicine, textile and other fields. At present, the methods for producing magnesium sulfate heptahydrate mainly consist of the following: [0003] 1. Sulfuric acid method: The ore containing magnesium oxide (dolomite, magnesite, serpentine) is crushed or its calcined powder (magnesium hydroxide or magnesium carbonate can also be used) and sulfuric acid are measured in proportion. Add clean water or washing water and mother liquor into the reaction tank, slowly add mineral powder under stirring, and then add sulfuric acid to carry out acidolysis reac...

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Application Information

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IPC IPC(8): C01F5/40
CPCC01F5/40
Inventor 李海民牛韩根杨海云侯殿保陈育刚孟瑞英
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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