New method of rapid synthesis of basic bitter salt

A magnesium sulfate whisker and basic technology, which is applied in the field of inorganic chemical material preparation, can solve problems such as limiting the large-scale industrial application of basic magnesium sulfate whiskers, and achieves improving the hydrothermal reaction rate, reducing process energy consumption and energy consumption. low effect

Inactive Publication Date: 2004-03-17
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In a word, although there are many reports on the preparation method of basic magnesium sulfate whiskers, there are still many problems i

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  • New method of rapid synthesis of basic bitter salt
  • New method of rapid synthesis of basic bitter salt
  • New method of rapid synthesis of basic bitter salt

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[0026] The present invention is a kind of preparation method of hydrated basic magnesium sulfate whisker, take the inorganic water-soluble magnesium salt (magnesium chloride, magnesium sulfate) from the high-magnesium brine by-product of sea and lake salt chemical industry as main raw material, in precipitating agent (hydrogen Sodium oxide, potassium hydroxide, ammonium hydroxide) and stirring state (200-700rpm) at 25-90 ° C for precipitation reaction to generate a highly dispersed nano-magnesium hydroxide precursor suspension with an average particle size of 10-100 nanometers; Add a small amount of flocculant (polyacrylamide, starch, polyaluminum sulfate) to the above suspension to improve the solid-liquid separation effect, and resuspend the obtained solid in a solution containing sulfate (sodium sulfate, potassium sulfate, ammonium sulfate, Magnesium sulfate), magnesium hydroxide solubilizer (sulfuric acid, nitric acid, ethylenediaminetetraacetic acid, oxalic acid) and dispe...

Embodiment 1

[0035] Prepare 30% (w / v) magnesium chloride solution 100ml, 20% (w / v) potassium hydroxide solution 100ml, 0.1% (w / v) polyacrylamide solution 5ml, hydrothermal reaction solution (containing 30% sodium sulfate, 20% sulfuric acid and 10% sodium hexametaphosphate) 100ml. The magnesium chloride solution was added to the potassium hydroxide solution at 25° C. under stirring (800 rpm), and the magnesium chloride addition rate was 30 ml / min. After the feeding was completed, a magnesium hydroxide precursor suspension with an average particle diameter of 10 nanometers was prepared. The polyacrylamide solution was added into the obtained suspension, stirred for 10 minutes, and then allowed to settle for 30 minutes. Cool the resulting suspension, filter it, wash it with deionized water for 3 times, put it into the hydrothermal reaction solution, stir (300rpm) and disperse it for 30 minutes, then place it in a high-pressure hydrothermal reaction kettle, and set it in a stirring state (700...

Embodiment 2

[0037] Prepare 10% (w / v) magnesium sulfate solution 100ml, 5% (w / v) sodium hydroxide solution 100ml, 1% (w / v) starch solution 5ml, hydrothermal reaction solution (containing 10% potassium sulfate, 5 % nitric acid and 1% sodium hexametaphosphate) 100ml. The magnesium sulfate solution was added to the sodium hydroxide solution at 40° C. under stirring (500 rpm), and the magnesium sulfate addition rate was 15 ml / min. After the feeding is completed, a highly dispersed magnesium hydroxide precursor suspension with an average particle diameter of 60 nanometers is obtained. The starch solution was added into the resulting suspension, stirred for 10 minutes and then left to settle for 30 minutes. Cool the resulting suspension, filter it, wash it with deionized water for 3 times, put it into the hydrothermal reaction solution, stir (300rpm) and disperse it for 30 minutes, then place it in a high-pressure reactor, and conduct hydrothermal treatment at 200°C under stirring (200rpm) 1 h...

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Abstract

The present invention is the preparation process of hydrated basic magnesium sulfate whisker in the field of inorganic chemical material preparation. The preparation process of hydrated basic magnesium sulfate whisker with magnesium salt material as side product of salt producing process includes the normal temperature fast mixing to prepare high solubility and high dispersivity nano level magnesium hydroxide precursor; fast hydrothermal reaction of the precursor with water solution of sulfate, magnesium hydroxide as solubilizer and dispersant; and subsequent filtering, washing and drying. The hydrated basic magnesium sulfate whisker is homogeneous in size, regular in appearance and high in dispersivity, has the composition of 5Mg(OH)2.MgSO4.3H2O, average length of 5-50 microns and average diameter of 0.1-2 microns. The product may be used as reinforcer and fire retardant in preparing high strength rubber, plastic, resin, ceramic and other composite material.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic chemical materials, in particular to a new method for rapidly synthesizing basic magnesium sulfate whiskers. Background technique [0002] Whiskers have an aspect ratio greater than 10 and a cross-sectional area less than 5×10 -4 cm 2 single crystal fiber material. When whiskers are crystallized, the atomic structure is highly ordered and there are few internal defects. Therefore, its strength and modulus are close to the theoretical values ​​of its complete crystal material. It is a reinforcing and toughening agent for composite materials with excellent mechanical properties. [0003] Since whiskers were first discovered by Bell Telephone Company of the United States in 1948, more than 100 whisker materials have been prepared, including metal whiskers (such as Sn, Fe, Cu, Te, Cd, Ni, etc.) and non-metallic whiskers ( Such as Si 3 N 4 , SiC, Al 2 o 3 , ZrO 2 , AlN, TiO 2 ...

Claims

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Application Information

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IPC IPC(8): C30B7/10C30B29/10C30B29/62
Inventor 向兰刘峰魏飞
Owner TSINGHUA UNIV
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