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Device and method for continuously preparing magnesium hydroxide flame retardant

A technology of magnesium hydroxide and flame retardant, applied in magnesium hydroxide and other directions, can solve the problems of high energy consumption and complex process, and achieve the goal of reducing carbon emissions, realizing product particle size and width-thickness ratio, reducing equipment volume and investment. Effect

Active Publication Date: 2012-07-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing hydrothermal reaction process is complex and consumes a lot of energy. From the perspective of industrial application costs, further process optimization and technology development are needed.

Method used

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  • Device and method for continuously preparing magnesium hydroxide flame retardant
  • Device and method for continuously preparing magnesium hydroxide flame retardant
  • Device and method for continuously preparing magnesium hydroxide flame retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Continuous preparation of magnesium hydroxide flame retardant using bromine production waste liquid and ammonia gas

[0040] Add a small amount of activated carbon powder to the bromine production waste liquid and stir for a period of time, filter to remove the color and organic matter to obtain a clear and transparent solution, then stir and add a small amount of sodium carbonate or sodium hydroxide solution to adjust the pH to above 5.5, use a precision filter The precipitate is separated to remove iron and calcium ions to obtain a clear colorless refined magnesium chloride solution, which is diluted with water to prepare a magnesium chloride solution with a magnesium ion concentration of 2.0 mol / l. After the solution is preheated to 30°C, it is transported to the high-gravity continuous reactor with a metering pump, mixed with the circulating liquid, and reacted in reverse contact with the ammonia gas. The operating parameters are controlled: the volume ratio of the circ...

Embodiment 2

[0042] Continuous preparation of magnesium hydroxide flame retardant using bromine production waste liquid and ammonia water as raw materials

[0043] The refined magnesium chloride solution of Example 1 was diluted with water to prepare a magnesium chloride solution with a magnesium ion concentration of 2.6 mol / l, and ammonia gas evaporated from liquid ammonia was absorbed by water to prepare ammonia water with a weight ratio of 25%. After preheating the magnesium chloride solution and the ammonia water to 50℃, they are respectively transported to the high-gravity continuous reactor with a metering pump, and mixed with the circulating liquid to react. The operating parameters are controlled: the volume ratio of the circulating slurry to the continuous feed is 80:1 The reaction temperature is 55°C, the molar ratio of ammonia and magnesium is 3.5:1, and the reaction residence time is 1 hour. The magnesium hydroxide slurry is continuously discharged from the reactor and enters the b...

Embodiment 3

[0045] Continuous preparation of magnesium hydroxide flame retardant using bromine production waste liquid and lime milk as raw materials

[0046] Dilute the refined magnesium chloride solution of Example 1 with water to prepare a magnesium chloride solution with a magnesium ion concentration of 2.2 mol / l. Take the quicklime block and add it to 90°C deionized water, stir and digest for 1 hour, age at room temperature, and pass through a 200 mesh sieve , Made into Ca(OH) with a solid content of 8.0%~13.0%(w) 2 suspension. After preheating the magnesium chloride solution and the milk of lime to 80°C, they are transported to the high-gravity continuous reactor with a metering pump, and mixed with the circulating liquid to react. The operating parameters are controlled: the volume ratio of the circulating slurry to the continuous feed is 80: 1. The reaction temperature is 80°C, the calcium-magnesium molar ratio is 0.9:1, and the reaction residence time is 2 hours. The magnesium hydro...

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Abstract

The invention discloses a device and method for continuously preparing magnesium hydroxide flame retardant. The device comprises a super gravity reactor unit and one or more serially connected high pressure reactor units, and particularly comprises a super gravity reactor, a stirring tank, a circulating pump, a feeding and discharging heat exchanger, one or more serially connected high pressure reactors and a slurry storing tank. The method comprises the steps of: simultaneously introducing a refining magnesium salt solution a precipitant into the super gravity reactor; mixing with cyclic reaction slurry from the stirring tank for carrying out a precipitation reaction; transporting to the slurry storing tank from a magnesium hydroxide slurry overflow port for aging; pouring the magnesium hydroxide slurry into the feeding and discharging heat exchanger of the high pressure reactor unit to be heated; carrying out continuous hydrothermal treatment in the high pressure reactor; and transporting the last slurry exhausted from the high pressure reactor back into the feeding and discharging heat exchanger to be cooled, and then carrying out post treatment. In the invention, the crystallizing speed and the grain size of the product can be controlled; the product property is good; the energy consumption is greatly reduced; and the carbon emission is decreased.

Description

Technical field [0001] The invention relates to an inorganic chemical reactor and the preparation of a green inorganic flame retardant magnesium hydroxide, especially the application of supergravity technology in the process of preparing inorganic powders, and in particular to the production of continuous supergravity reaction precipitation and continuous hydrothermal treatment technology New technology of magnesium hydroxide flame retardant. Background technique [0002] Magnesium hydroxide has the characteristics of high decomposition temperature, good thermal stability, non-toxic, smokeless and smoke suppression, and can be used as a high-performance inorganic flame retardant in polymer materials. Due to the increasingly high requirements for environmental protection today, the research on environmentally friendly flame retardants has received increasing attention, making magnesium hydroxide flame retardants a hot spot for development and research (industrialization) at home a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/20C01F5/22
Inventor 宋云华陈建铭文利雄张鹏远
Owner BEIJING UNIV OF CHEM TECH
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