Impinging-stream-based continuous magnesium hydroxide production process

Abstract

The invention discloses an impinging-stream-based continuous magnesium hydroxide production process, and relates to a magnesium hydroxide production process. The process comprises the steps that a magnesium salt and precipitant with certain concentration serve as raw materials, an impinging stream reactor is adopted, in the impinging stream reactor, the magnesium salt and the precipitant react at20-90 DEG C, magnesium hydroxide precipitates are generated, the obtained precipitates are aged at 50-120 DEG C for 1-10 hours, then filtering and drying are conducted, and a magnesium hydroxide product is finally obtained. Auxiliary equipment of the process comprises a raw material storage tank, a pump, a flowmeter, a filter, an ageing tank, a dryer and the like. Accordingly, the impinging streamreactor is adopted, the magnesium salt and the precipitant serve as the raw materials, and the magnesium hydroxide product which is high in dispersion, small in specific surface area, uniform in particle size and consistent in crystal form can be obtained. By means of the continuous magnesium hydroxide production process, the materials are mixed rapidly, the reaction is efficient, and residence time distribution is narrow. The process flow is short, the equipment is less, and the product quality is good and stable.

Description

technical field

[0001] The invention relates to a magnesium hydroxide production process, in particular to a continuous magnesium hydroxide production process based on impinging flow. Background technique

[0002] As a "green" inorganic flame retardant, magnesium hydroxide is more stable at high temperature and has better smoke suppression ability, and its indicators are better than aluminum hydroxide flame retardant. With the development of the global flame retardant product market showing the trend of non-halogenation, low hazard and low smoke, the market application prospect of flame retardant magnesium hydroxide is very broad.

[0003] At present, the methods for preparing magnesium hydroxide are mainly chemical precipitation method and natural brucite processing method (physical pulverization). The properties (physical properties and chemical composition content) of the two types of magnesium hydroxide products are different, the use effects are different, and the mark...

Examples

Embodiment 1

[0026] Embodiment 1. Adopt the magnesium chloride solution of 2mol / L and the sodium hydroxide of 4mol / L as raw material, equal-volume feed, adopt to put 6 nozzle impingement flow reactors to react, reaction temperature is 50 ℃, continuous production, after reaction The precipitate is filtered, aged for 4 hours under hydrothermal conditions at 100°C, filtered, washed and dried to obtain the magnesium hydroxide product.

Embodiment 2

[0027] Embodiment 2. Adopt 1mol / L magnesium nitrate solution and the ammoniacal liquor that mass concentration is 26%~28% as raw material, equal volume feeds, adopts to put 8 nozzle impingement flow reactors to react, reaction temperature is 60 ℃, continuous Production, after the reaction, the precipitate is filtered, aged at 120°C for 2 hours, then filtered, washed and dried to obtain the magnesium hydroxide product.

Embodiment 3

[0028] Embodiment 3. Using 1mol / L magnesium nitrate solution and ammonia as raw materials, the molar flow rate of ammonia is 4 times the equivalent of magnesium nitrate, using an impact flow reactor with 12 nozzles to react, the reaction temperature is 70 ° C, continuous production After the reaction, the precipitate was filtered, aged at 120°C for 2 hours under hydrothermal conditions, filtered, washed and dried to obtain the magnesium hydroxide product.

technical field

[0001] The invention relates to a magnesium hydroxide production process, in particular to a continuous magnesium hydroxide production process based on impinging flow. Background technique

[0002] As a "green" inorganic flame retardant, magnesium hydroxide is more stable at high temperature and has better smoke suppression ability, and its indicators are better than aluminum hydroxide flame retardant. With the development of the global flame retardant product market showing the trend of non-halogenation, low hazard and low smoke, the market application prospect of flame retardant magnesium hydroxide is very broad.

[0003] At present, the methods for preparing magnesium hydroxide are mainly chemical precipitation method and natural brucite processing method (physical pulverization). The properties (physical properties and chemical composition content) of the two types of magnesium hydroxide products are different, the use effects are different, and the mark...

Examples

Embodiment 1

[0026] Embodiment 1. Adopt the magnesium chloride solution of 2mol / L and the sodium hydroxide of 4mol / L as raw material, equal-volume feed, adopt to put 6 nozzle impingement flow reactors to react, reaction temperature is 50 ℃, continuous production, after reaction The precipitate is filtered, aged for 4 hours under hydrothermal conditions at 100°C, filtered, washed and dried to obtain the magnesium hydroxide product.

Embodiment 2

[0027] Embodiment 2. Adopt 1mol / L magnesium nitrate solution and the ammoniacal liquor that mass concentration is 26%~28% as raw material, equal volume feeds, adopts to put 8 nozzle impingement flow reactors to react, reaction temperature is 60 ℃, continuous Production, after the reaction, the precipitate is filtered, aged at 120°C for 2 hours, then filtered, washed and dried to obtain the magnesium hydroxide product.

Embodiment 3

[0028] Embodiment 3. Using 1mol / L magnesium nitrate solution and ammonia as raw materials, the molar flow rate of ammonia is 4 times the equivalent of magnesium nitrate, using an impact flow reactor with 12 nozzles to react, the reaction temperature is 70 ° C, continuous production After the reaction, the precipitate was filtered, aged at 120°C for 2 hours under hydrothermal conditions, filtered, washed and dried to obtain the magnesium hydroxide product.

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