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Reaction system and method for preparing nano magnesium hydroxide

A nano-magnesium hydroxide and reaction system technology, applied in the field of nano-material preparation, can solve the problem that the stirring strength is not enough to disperse the nano-powder aggregates, it is impossible to control the nucleation and growth stages of the nano-powder, and the mixing and dispersing strengths are low. and other problems, to achieve the effect of good product quality stability, uniform appearance and fast mixing speed

Inactive Publication Date: 2013-04-10
YINGKOU WOKERUI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In tank reaction equipment, due to the low mixing and dispersion strength of mechanical agitation, its enhanced mass transfer makes the speed of uniform mixing of materials much lower than the reaction speed, and the agitation strength is far from enough to disperse the agglomerated nano-powder aggregates. Not to mention controlling the nucleation and growth stages in the preparation of nanopowders
Preparation of Nano Mg(OH) by Kettle Precipitation 2 There are serious problems such as uneven product particles, wide size distribution, serious agglomeration, and difficult to control morphology.

Method used

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  • Reaction system and method for preparing nano magnesium hydroxide
  • Reaction system and method for preparing nano magnesium hydroxide
  • Reaction system and method for preparing nano magnesium hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] like figure 1 As shown, a reaction system for preparing nano-magnesium hydroxide: it is composed of at least two sets of feeding devices, a reaction device (3) and a storage tank (4); the feeding device is connected to the reaction device (3), and the reaction device ( 3) Connect with the storage tank (4).

[0028] The feeding device includes a material tank (1) and a constant flow pump (2).

[0029] like figure 2 As shown, the reaction device (3) includes a reaction vessel (12), an ultrasonic probe fixed in the reaction vessel (12), an ultrasonic control system (11), which is combined at one end connected to the reaction vessel (12) The two feed pipes (5), the collection tank (6) located in the middle of the reaction vessel, and the discharge port (7) connected to the collection tank (6); the ultrasonic probe includes an ultrasonic transducer (9) and horn (8); the ultrasonic probe is tightly fixed in the reactor (12) through the sealing ring (10). An included angl...

Embodiment 2

[0033] MgCl 2 ·6H 2 O and polyethylene glycol 800 (PEG800) were dissolved in deionized water and stirred to form Mg 2+ Soluble magnesium salt solution with a concentration of 1.0mol / L, PEG800 added in an amount of 2% of the magnesium hydroxide output, placed in a material tank of the continuous reaction system; NaOH was also dissolved in deionized water to form OH - The lye with a concentration of 2.0mol / L is placed in another material tank of the continuous reaction system. Then two constant flow pumps are turned on at the same time, and equal volumes of soluble magnesium salt solution and lye are pumped into the reaction device at the same time, and the flow rate of the reaction solution is controlled at 5m / s. Simultaneously, turn on the ultrasonic wave of the reaction device, control the ultrasonic frequency to be 28KHz, and the ultrasonic power to be 100W. The quantitative production of nano-magnesium hydroxide can be realized by keeping the reaction conditions stable a...

Embodiment 3

[0035] MgCl 2 ·6H 2 O and polyvinyl alcohol (PVA) were dissolved in deionized water and stirred to form Mg 2+ Soluble magnesium salt solution with a concentration of 1.4mol / L, the amount of PVA added is 2.3% of the magnesium hydroxide output, placed in a material tank of the continuous reaction system; in addition, ammonia water is also dissolved in deionized water to form OH - Concentration is the lye of 2.8mol / L, is placed in another material tank of continuous reaction system. Then two constant flow pumps are turned on at the same time, and equal volumes of soluble magnesium salt solution and lye are pumped into the reaction device at the same time, and the flow rate of the reaction solution is controlled at 8m / s. Simultaneously, turn on the ultrasonic waves of the reaction device, control the ultrasonic waves to a frequency of 40KHz, and an ultrasonic power of 250W. The quantitative production of nano-magnesium hydroxide can be realized by keeping the reaction condition...

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Abstract

The invention discloses a reaction system and a method for preparing nano magnesium hydroxide. The invention adopts the technical scheme that the reaction system comprises a feeding device, a reaction device and a storage tank; the feeding device is connected with the reaction device; and the reaction device is connected with the storage tank. The method for preparing the nano magnesium hydroxidecomprises the following steps of: respectively placing soluble magnesium salt solution and alkali liquor in different material tanks; simultaneously starting a constant flow pump of the feeding device, simultaneously feeding the same volume of the soluble magnesium salt solution and the alkali liquor into the reaction device, controlling the flowing speed of reaction solution in the range of 2 to20m / s, simultaneously starting ultrasonic waves of the reaction device, controlling the frequency of the ultrasonic waves in the range of 20 to 100kHz and controlling the power of the ultrasonic waves in the range of 50 to 800W; and carrying out washing, solid-liquid separation and drying on reacted slurry to obtain a target product. The reaction system and the method are simple to operate and have small investment, short production period and mild production condition. The prepared nano powder have homogeneous appearance, narrow size distribution and good dispersity and is particularly suitable for industrial production.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a method and a reaction system for preparing nanometer magnesium hydroxide. Background technique [0002] Mg(OH) 2 It is an important chemical product and intermediate, which has a wide range of applications and demands in environmental protection, medicine, food, agriculture, chemical industry, petrochemical, electronics and other industries. Especially in recent years, nano Mg(OH) 2 As an environmentally friendly and environmentally friendly green flame retardant, it has become the development trend of flame retardants in the future because of its advantages of non-toxicity, high efficiency, smoke suppression, and pollution-free. my country is a country with a large magnesium resource, and it is very important for the development of Mg(OH) 2 Flame retardant is very beneficial; however, it is not a strong country in terms of production technology, and there is still a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/22B82Y40/00
Inventor 陈冬梅陈国荣
Owner YINGKOU WOKERUI TECH
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