Method for preparing fibrous nano magnesium hydrate

A nano-magnesium hydroxide and fibrous technology, which is applied in the field of hydrometallurgy, can solve the problems of inconvenient filtration, easy generation of gel, and difficult filtration and washing of gel, so as to reduce filling volume, reduce energy consumption, and facilitate comprehensive Use the effects of development

Inactive Publication Date: 2008-05-14
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

Mix brine containing magnesium chloride and ammonia water according to the molar ratio of magnesium chloride to free ammonia of 1:1.3-2.0, and react the mixture in an environment of 45-90°C for 5-30 minutes, filter and wash the reaction solution , dry, and pulverize to obtain solid magnesium hydroxide; the process is simple, but the preparation process is easy to produce gel, which is not convenient for subsequent filtration; in CN1389521, nano-magnesium hydroxide is prepared by sol-gel method, which uses soluble magnesium salt and Ammonia water is the main raw material, add a little sodium dodecylbenzenesulfonate, prepare nano-magnesium hydroxide colloid under normal temperature and ultrasonic vibration, then dehydrate the formed gel, then calcinate and grind to prepare nano-magnesium hydroxide, but the The gel prepared by the method is not easy to be washed by subsequent filtration

Method used

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  • Method for preparing fibrous nano magnesium hydrate

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Experimental program
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Effect test

Embodiment 1

[0021] Example 1: Qinghai Salt Lake bittern was used as raw material, and the contents of main elements were as follows.

[0022] main ion

[0023] Ca 2+ Add 1.5 times the equivalent mole of sodium sulfate into the bitter bittern, raise the temperature to 50°C and continue to stir, and react for 30min, the Ca in the bittern 2+ CaSO 4 The precipitate is removed to obtain a magnesium chloride solution; the magnesium salt solution obtained above is diluted to contain Mg 2+ 80g / l; Get the magnesium salt solution 200ml after this dilution, and add the dehydrated alcohol of 15ml and 10ml gelatin and sodium lauryl sulfate mixed solution (gelatin: sodium lauryl sulfate=1 : 1wt%), make the magnesium salt solution that contains composite dispersant; At room temperature 30 ℃, add 20% ammoniacal solution with the speed of 2ml / min in above-mentioned magnesium salt solution, keep stirring speed simultaneously and be 800r / min, Stop injecting lye until the system pH=9, and obtain...

Embodiment 2

[0025] Ca 2+ Add 1.5 times the equivalent mole of sodium sulfate into the bitter bittern, raise the temperature to 30°C and continue to stir, and react for 60 minutes, the Ca in bitter bittern 2+ CaSO4 The precipitate is removed to obtain a magnesium chloride solution; the magnesium salt solution obtained above is diluted to contain Mg 2+ 50g / l, get the magnesium salt solution 200ml after this dilution, and add the dehydrated alcohol of 10ml and the gelatin of 8ml and sodium lauryl sulfate mixed solution (gelatin: sodium lauryl sulfate=1 : 1wt%), make the magnesium salt solution that contains composite dispersant; At room temperature 15 ℃, add 25% ammonia solution with the speed of 4ml / min in above-mentioned magnesium salt solution, keep stirring speed and be 1000r / min, until System pH = 10, stop injecting lye, and get milky white Mg(OH) 2 suspension; then raise the temperature of the emulsion to 60°C and age for 2 hours; then filter the aged magnesium hydroxide emulsion, wa...

Embodiment 3

[0027] Ca 2+ Add 1.5 times the equivalent mole of sodium sulfate into the bitter bittern, raise the temperature to 40°C and continue to stir, and react for 45 minutes, the Ca in bitter bittern 2+ CaSO 4 The precipitate is removed to obtain a magnesium chloride solution; the magnesium salt solution obtained above is diluted to contain Mg 2+ 10g / l, get the magnesium salt solution 200ml after this dilution, and add the dehydrated alcohol of 6ml and 5ml gelatin and sodium lauryl sulfate mixed solution (gelatin: sodium lauryl sulfate=1 : 1wt%), make the magnesium salt solution that contains composite dispersant; At room temperature 20 ℃, add 10% sodium hydroxide solution with the speed of 8ml / min in above-mentioned magnesium salt solution, keep stirring speed simultaneously and be 1400r / min until the system pH = 10.5 to stop injecting lye, to obtain milky white Mg(OH) 2 suspension; then raise the temperature of the emulsion to 70°C and age for 1 h; then filter the aged magnesiu...

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Abstract

The invention relates to a preparation method of a fiber-shaped nanometer magnesium hydroxide. The bitter brine of the discharge liquid after extraction of potassium, lithium, boron and other elements from the salt lake water is used as the raw material; the ammonia liquor or the sodium hydroxide solution is taken as the precipitant; the mixed solution of absolute ethanol, gelatin and lauryl sodium sulfate is used as the compound dispersing agent; the technological proposal is that the precipitation reaction is carried out at room temperature; through a serial procedures of heating and aging, washing in the dilute ammonia liquor, filtering, drying in the vacuum and grinding, the pure-white fiber-shaped nanometer magnesia powder is prepared with an average size of 30 to 80nm in diameter and 200 to 500nm in length. When the fiber-shaped nanometer magnesia powder is used as an inorganic flame retardant, the filling amount needed decreases significantly and the fiber-shaped nanometer magnesia powder can reinforce and toughen the polymer materials; the reaction temperature is the normal temperature, which reduces the energy consumption significantly; the fiber-shaped nanometer magnesia powder also develops a new method for comprehensive utilization of the salt lake resources.

Description

1. Technical field [0001] The invention relates to a method for preparing fibrous nano-magnesium hydroxide, which belongs to the technical field of hydrometallurgy. 2. Background technology [0002] my country is a country with a large amount of magnesium resources, especially the huge reserves of magnesium resources in salt lakes. However, the development and utilization of salt lakes in my country are mainly concentrated on resources such as potassium, lithium, and boron, resulting in local enrichment of magnesium resources and destroying the ecology of salt lakes, which has become a "magnesium hazard" to some extent. However, the development and utilization of magnesium resources in salt lakes in my country is still in its infancy. There are many raw materials and low-grade products, but few high-end and functional products, forming a situation where low-end products are exported and high-end products are imported. Therefore, it is imperative to increase the development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/20C01F5/22B82B3/00
Inventor 徐宝强杨斌马文会刘大春谢克强戴永年刘永成易惠华伍继君邓勇王飞曲涛熊恒秦博
Owner KUNMING UNIV OF SCI & TECH
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