Granularity-controllable magnesium hydroxide reaction crystallization apparatus and process

A technology of reactive crystallization and magnesium hydroxide, which is applied in the directions of magnesium hydroxide, general layout of crystallization equipment, and crystallization separation, etc., can solve the problems of wide particle size distribution, difficult filtration, small addition amount, etc., and achieve the effect of narrow particle size distribution.

Active Publication Date: 2017-05-31
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product obtained by the ammonia method has high purity and large particle size, but there are air and water pollution in the production process, and the ammonia distillation operation is complicated and the cost is high.
The sodium hydroxide method can produce high-purity magnesium hydroxide products. If combined with the combined alkali production process, zero discharge of wastewater can be achieved and production costs can be effectively reduced; however, due to the strong alkalinity of sodium hydroxide, the reaction rate is too fast, The crystallization process is difficult to control, resulting in problems such as small particle size, wide particl

Method used

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  • Granularity-controllable magnesium hydroxide reaction crystallization apparatus and process
  • Granularity-controllable magnesium hydroxide reaction crystallization apparatus and process
  • Granularity-controllable magnesium hydroxide reaction crystallization apparatus and process

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Example 1

[0037] The three-stage magnesium hydroxide reaction crystallizer (1) is used to form a reaction crystallization device. The crystallizer stirring blade (7) adopts two-layer down-pressure rotating blades; a longitudinal partition (6) is installed between the jacketed kettle body (4) and the deflector (5); magnesium chloride feed pipe (9) The mouth and the sodium hydroxide feed pipe (10) are located outside the guide tube (5), and the height of the tube mouth is 20cm above the bottom edge of the guide tube (5), and they are arranged on the two sides of the longitudinal partition (6). Side; the diameter of the deflector cylinder (5) is 0.4 times the inner diameter of the jacketed kettle body (4), and the lower edge of the deflector cylinder (5) is 15 cm from the bottom of the jacketed kettle body (4).

[0038] In each reaction crystallizer (1), a sodium chloride solution with a mass concentration of 15% is added as the bottom liquid of the reaction crystallization,...

Example Embodiment

[0041] Example 2

[0042] The above-mentioned 6-stage magnesium hydroxide reaction crystallizer (1) is used to form a reaction crystallization device. The crystallizer stirring blade (7) adopts a three-layer downward pressure type rotating blade. A longitudinal partition (6) is installed between the jacketed kettle body (4) and the deflector (5) of the first, second and third stages of the reaction crystallizer; the magnesium chloride feed pipe (9) port and the sodium hydroxide feed The openings of the pipes (10) are all located outside the guide tube (5), and the height of the nozzles are all located 5cm above the lower edge of the guide tube (5), and they are arranged on both sides of the longitudinal partition (6); the guide tube (5) ) The diameter is 0.5 times the inner diameter of the jacketed kettle body (4), and the lower edge of the deflector cylinder (5) is 20 cm from the bottom of the jacketed kettle body (4). No longitudinal partitions (6) are installed in the jacket...

Example Embodiment

[0046] Example 3

[0047] The five-stage magnesium hydroxide reaction crystallizer (1) is used to form a reaction crystallization device. The crystallizer stirring blade (7) adopts a three-layer downward pressure type rotating blade. No longitudinal partition (6) is installed in the jacketed kettle body (4) of the first, second, and third stage reaction crystallizers, and the sodium hydroxide feed pipe (10) is located in the guide tube (5). The top edge of the flow tube (5) is 5cm below; the port of the magnesium chloride feed pipe (9) is located outside the flow tube (5) and 30cm above the bottom of the flow tube (5); the diameter of the flow tube (5) is jacketed The inner diameter of the kettle body (4) is 0.7 times, and the distance from the bottom edge of the deflector cylinder (5) to the bottom of the jacketed kettle body (4) is 40 cm. A longitudinal partition (6) is installed between the jacketed kettle body (4) and the deflector (5) of the 4th and 5th reaction crystalliz...

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Abstract

The invention discloses a granularity-controllable magnesium hydroxide reaction crystallization apparatus and process. The reaction crystallization apparatus consists of a reaction crystallizer (1), a conveying pump (2) and a pipeline (3). The reaction crystallizer (1) comprises a jacket-type kettle body (4), a guide barrel (5), a longitudinal separation plate (6), a stirring paddle (7), an electric stirrer (8), a magnesium chloride feeding pipe (9), a sodium hydroxide feeding pipe (10), a feed distributor (11), a magnesium hydroxide discharging pipe (12) and a magnesium hydroxide feeding pipe (13). The invention also provides the magnesium hydroxide reaction crystallization process. By utilizing the apparatus and the process provided by the invention, the granularity-controllable production of the magnesium hydroxide can be realized, the magnesium hydroxide with different granularities can be prepared, and the requirements of different users on the granularity of a magnesium hydroxide product can be met. The granularity-controllable magnesium hydroxide reaction crystallization apparatus and process have the advantages of flexibility and adjustability in product granularity and narrow granularity distribution.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and relates to a reaction crystallization device and process of magnesium hydroxide with controllable particle size, in particular to a reaction crystallization device and process for synthesizing magnesium hydroxide with different particle sizes by using magnesium chloride and sodium hydroxide as raw materials. Background technique [0002] Magnesium hydroxide is an important multifunctional inorganic powder material, which can be used as a green inorganic flame retardant, flue gas desulfurizer, acid waste water neutralizer, water heavy metal remover, etc. It is used as an anti-acid in the pharmaceutical industry agents, laxatives; [0003] At present, the main production methods of magnesium hydroxide products include two categories, one is to use natural brucite to directly produce magnesium hydroxide through crushing and removing impurities; the other is to produce magnesi...

Claims

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Application Information

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IPC IPC(8): C01F5/22B01D9/02
CPCB01D9/0031B01D9/004B01D9/005B01D9/0059B01D2009/0086C01F5/22C01P2004/61
Inventor 刘宝树胡永琪刘润静孙华
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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