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Method and device for preparing anhydrous magnesium chloride

An anhydrous magnesium chloride and preparation device technology, applied in the direction of magnesium chloride, magnesium halide, etc., can solve the problems of low production efficiency, difficulty in uniform dispersion of gas, high cost of construction and operation, etc.

Active Publication Date: 2015-03-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method has the following problems: a) the cover is easily mixed into the product anhydrous magnesium chloride due to the movement of the material layer during the heating process, which seriously affects the purity of the anhydrous magnesium chloride; b) the reactant needs the cover quartz sand or Alumina is continuously protected, so that this method can only achieve intermittent production and cannot meet the requirements of continuous automatic production
Using gas chlorinating agent (HCl or Cl 2 ) In the melt, the preparation containing anhydrous magnesium chloride melt mainly has the following problems: a) the gas chlorination agent utilization rate is not high, because the gas is difficult to realize uniform dispersion in the melt, and needs to keep enough chlorine in the whole melt Magnesium oxide can be converted into magnesium chloride only when the gas concentration is reduced, especially when the magnesium oxide content in the melt is low, the gas chlorination agent utilization rate is very low; b) the recycling of the hydrochloric hydrogen gas obtained during dehydration requires a complex drying system, and this System cost and operating cost are high
At present, the key issues restricting the production of anhydrous magnesium chloride are: (1) The use of a large amount of chlorine gas and hydrogen chloride gas requires high sealing and corrosion resistance of the equipment, and it is difficult to purify the tail gas containing water vapor (purity must reach 99.5%) Above), increased the cost of operation; (2) anhydrous magnesium chloride is difficult to realize continuous production, and production efficiency is low; (3) product anhydrous magnesium chloride purity is low, has seriously reduced the current efficiency of follow-up electrolysis process, has increased power consumption

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  • Method and device for preparing anhydrous magnesium chloride
  • Method and device for preparing anhydrous magnesium chloride
  • Method and device for preparing anhydrous magnesium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] 945g of ammonium chloride and 350g of magnesium oxide are mixed evenly and then added to the chlorination and dehydration furnace with an aspect ratio of 3.5:1. The thickness of the mixture in the furnace is 15cm. The mixture is heated in different heating zones: firstly, it is heated at 150°C 0.2 hours, then heated at 300°C for 2.5 hours, and finally heated at 700°C for 0.5 hours to obtain anhydrous magnesium chloride. Anhydrous magnesium chloride is discharged from the discharge port at the bottom of the furnace, and a new batch of mixture is added from the feed port at the upper part of the furnace. In this embodiment, the amount of ammonium chloride added is 2.7 parts by weight based on the amount of magnesium oxide added as 1.00 parts by weight. image 3 The XRD pattern of the anhydrous magnesium chloride prepared for the present embodiment.

[0073] The obtained anhydrous magnesium chloride was characterized according to the above measurement method. The result ...

Embodiment 2

[0076] 1404g of ammonium chloride and 350g of magnesium oxide are mixed evenly and added to the chlorination and dehydration furnace with an aspect ratio of 3.5:1. The thickness of the mixture in the furnace is 23cm. The mixed materials are heated in different heating zones: firstly heated at 80°C 3.5 hours, then heated at 400°C for 0.2 hours, and finally heated at 450°C for 2.5 hours to obtain anhydrous magnesium chloride. Anhydrous magnesium chloride is discharged from the discharge port at the bottom of the furnace, and a new batch of mixture is added from the feed port at the upper part of the furnace. In this experiment, the amount of ammonium chloride added was 4.0 parts by weight based on the amount of magnesium oxide added as 1.00 parts by weight.

[0077] The obtained anhydrous magnesium chloride was characterized according to the above measurement method. The result is as follows:

[0078] Carry out XRD phase analysis on the sample composition, the composition is a...

Embodiment 3

[0080] 1404g of ammonium chloride and 350g of magnesium oxide are evenly mixed and then added to the chlorination dehydration furnace with an aspect ratio of 15:1. The thickness of the mixture in the furnace is 95cm. The mixed materials are heated in different heating zones: firstly heated at 100°C 1.0 hour, then heated at 380°C for 1.8 hours, and finally heated at 700°C for 1.0 hour to obtain anhydrous magnesium chloride. Anhydrous magnesium chloride is discharged from the discharge port at the bottom of the furnace, and a new batch of mixture is added from the feed port at the upper part of the furnace. In this experiment, the amount of ammonium chloride added was 4.0 parts by weight based on the amount of magnesium oxide added as 1.00 parts by weight.

[0081] The obtained anhydrous magnesium chloride was characterized according to the above measurement method. The result is as follows:

[0082] Carry out XRD phase analysis on the sample composition, the composition is an...

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Abstract

The invention relates to a device for preparing anhydrous magnesium chloride and a preparation method which uses the device. The device is a chlorination dehydration furnace and comprises a storage cabin, wherein the upper part of the storage cabin is a preheating zone; the middle part of the storage cabin is a double salt forming zone; the bottom of the storage cabin is an ammonium removing zone; the storage cabin is connected with an outlet and has certain sealing property. The preparation method comprises the following steps: uniformly mixing magnesium oxide and / or hydrated magnesium chloride and ammonium chloride, adding the mixture into the chlorination dehydration furnace, and heating, thereby preparing anhydrous magnesium chloride; and repeating the above operation steps when the anhydrous magnesium chloride is discharged out, thereby achieving continuous production. A method for preparing anhydrous magnesium chloride by using the rich magnesite and magnesium chloride hexahydrate resources in China is provided by the invention, continuous production of anhydrous magnesium chloride is achieved, the production efficiency is improved, the production cost is lowered, and the cost of environment protection is lowered; the prepared anhydrous magnesium chloride is high in purity, the content of the main impurity magnesium oxide in the anhydrous magnesium chloride can be controlled to be 0.5% or even less than 0.1%, and the anhydrous magnesium chloride can be used for preparing magnesium metal in an electrolysis manner and has very good industrial and commercial prospect.

Description

technical field [0001] The present invention relates to a preparation method and device of anhydrous magnesium chloride, in particular, to a method and device for preparing anhydrous magnesium chloride using magnesium oxide or hydrated magnesium chloride as a raw material. The process and device of the present invention can realize the continuous production of anhydrous magnesium chloride Chemical production, providing raw materials for the electrolysis of magnesium metal. Background technique [0002] Magnesium belongs to the IIA (second main group) group alkaline earth metal elements on the periodic table of elements. Metal magnesium is a silver-white metal with hard quality and slight ductility. Magnesium has a low density and a high ionization tendency. Compared with plastics, magnesium alloy has light weight, high specific strength, good vibration damping, good thermal fatigue performance, not easy to age, good thermal conductivity, strong electromagnetic shielding abil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/30C01F5/34
CPCC01F5/30C01F5/34
Inventor 卢旭晨张志敏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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