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Method for preparing anhydrous magnesium chloride through large-size spray drying and device

A technology of magnesium chloride anhydrous and magnesium chloride hexahydrate, applied in magnesium chloride, magnesium halide and other directions, can solve problems such as worker safety and environmental damage, and achieve the effects of environmental and human safety, simple production process and pollution reduction.

Inactive Publication Date: 2019-03-22
CHANGZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Double salt and complex decomposition and dehydration method, in the preparation of anhydrous magnesium chloride by the aniline hydrochloride method, although it solves the impact of harmful gases caused by the decomposition of other ammonia-containing compounds, aniline is a carcinogen, once workers contact or leak for a long time Great harm to worker safety and the environment

Method used

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  • Method for preparing anhydrous magnesium chloride through large-size spray drying and device
  • Method for preparing anhydrous magnesium chloride through large-size spray drying and device
  • Method for preparing anhydrous magnesium chloride through large-size spray drying and device

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Embodiment 1

[0035] Present embodiment adopts above-mentioned large-scale spray drying to prepare the method for anhydrous magnesium chloride, and technological process is as follows figure 1 As shown, the device includes a magnesium chloride solution preparation device, a centrifugal spray drying device, a secondary cyclone separator, an electrostatic precipitator and an induced draft fan in sequence, and also includes a blast hot blast stove, and the air outlet of the blast hot gas stove is connected with the centrifugal spray drying The spray ports of the device are opposite.

[0036] Described magnesium chloride preparation method comprises the following steps:

[0037] (1) 38t of bischofite was dissolved in distilled water to prepare a solution with a mass fraction of magnesium chloride of 40%, and heated to 130°C.

[0038] (2) Pass the preheated solution through a centrifugal spray dryer, the inlet air temperature of the spray dryer is 650°C, the outlet air temperature is above 260°...

Embodiment 2

[0042] Present embodiment adopts above-mentioned large-scale spray drying to prepare the method for anhydrous magnesium chloride, and technological process is as follows figure 1 shown, including the following steps:

[0043] (1) 38t of bischofite was dissolved in distilled water to prepare a solution with a mass fraction of magnesium chloride of 40%, and heated to 140°C.

[0044] (2) Pass the preheated solution through a centrifugal spray dryer, the air inlet temperature of the spray dryer is 650°C, the outlet air temperature is above 260°C, and the spray drying time is 25s.

[0045] (3) Collect anhydrous magnesium chloride powder by secondary cyclone separator and secondary electrostatic precipitator.

[0046] The crude product of anhydrous magnesium chloride powder is measured, and by XRD phase analysis, the composition is anhydrous magnesium chloride, and the magnesium ion and chloride ion are titrated by volumetric method, and the weight of anhydrous magnesium chloride i...

Embodiment 3

[0048] Present embodiment adopts above-mentioned large-scale spray drying to prepare the method for anhydrous magnesium chloride, and technological process is as follows figure 1 shown, including the following steps:

[0049] (1) 38t of bischofite was dissolved in distilled water to prepare a solution of 40% water by mass of magnesium chloride, and heated to 150°C.

[0050] (2) Pass the preheated solution through the centrifugal spray dryer. The air inlet temperature of the spray dryer is 650°C, the outlet air temperature is above 260°C, and the spray drying time is 40s.

[0051] (3) Collect anhydrous magnesium chloride powder by secondary cyclone separator and secondary electrostatic precipitator.

[0052] The crude product of anhydrous magnesium chloride powder is measured, and by XRD phase analysis, the composition is anhydrous magnesium chloride, and the magnesium ion and chloride ion are titrated by volumetric method, and the weight of anhydrous magnesium chloride is cal...

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Abstract

The invention belongs to the technical field of preparation of inorganic materials and discloses a method for preparing anhydrous magnesium chloride through large-size spray drying. The method comprises the following steps: (1) preparing a magnesium chloride solution of a certain concentration from magnesium chloride hexahydrate; (2) performing high-temperature centrifugal spray drying on the magnesium chloride solution obtained in the step (1), and treating with a two-stage cyclone separator and an electronic dust collector, thereby obtaining the anhydrous magnesium chloride. According to themethod, the production process of the anhydrous magnesium chloride can be shortened, no pollution is caused, and industrial production can be easily implemented; compared with other preparation methods, the method needs no protection atmosphere, other organic matters or heavy metals are also avoided, no toxic gases such as hydrogen chloride or ammonia gas are generated, and the environment protection investment cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic materials, and in particular relates to a method and device for preparing anhydrous magnesium chloride by one-step dehydration of large-scale centrifugal spray drying. The anhydrous magnesium chloride prepared by the method can be directly used in the production of metal magnesium by an electrolysis method. Background technique [0002] In the 21st century, due to the advantages of low density, high specific strength and specific stiffness, and strong damping, shock absorption and noise reduction capabilities, magnesium metal and its alloys are more and more used in transportation, electronic and electrical industries, and light industry and chemical industry. , metallurgy, aerospace, national defense and other sectors. The methods for producing metallic magnesium include thermal reduction and electrolysis. The electrolytic magnesium smelting process is advanced, with low energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/34
CPCC01F5/34C01P2002/72C01P2006/82
Inventor 刘宝亮王炎秋黄红云王秀福
Owner CHANGZHOU INST OF TECH
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