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Method for preparing magnesium oxide crystal whiskers from brine through hydrothermal-basic magnesium chloride precursor

The technology of magnesium oxide whisker and magnesium chloride is applied in the field of marine chemical industry, and can solve the problems of poor quality of magnesium oxide whisker, difficulty in realizing industrialization, complicated process, etc., and achieve the effects of good appearance, low production cost and simple process method.

Pending Publication Date: 2019-02-19
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the methods of magnesium oxide whiskers produced at home and abroad have their own advantages, the process is complex and the conditions are harsh, and some require high temperature, high pressure or inert gas, so the production cost is high, and it is difficult to realize industrialization
And the quality of MgO whiskers is poor, there are many powders, broken crystals, coarse crystals, and many impurities in the whiskers, and its production is still in the production stage of crude primary products

Method used

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  • Method for preparing magnesium oxide crystal whiskers from brine through hydrothermal-basic magnesium chloride precursor
  • Method for preparing magnesium oxide crystal whiskers from brine through hydrothermal-basic magnesium chloride precursor
  • Method for preparing magnesium oxide crystal whiskers from brine through hydrothermal-basic magnesium chloride precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First, take 200ml of brine from the salt field, measure the concentration of magnesium ions in the brine of the salt field, add a certain volume of deionized water to dilute, and adjust the concentration of magnesium ions in the brine to 3mol / L. Configure 200ml of sodium hydroxide solution so that the molar ratio of magnesium ions to sodium hydroxide is 8.

[0032] Add the prepared brine to sodium hypochlorite for purification treatment, the volume ratio of sodium hypochlorite to brine is 1:1000, turn on the stirring device, the stirring speed is 150r / min, the stirring time is 15min, and then keep the settling time for 3.5h.

[0033] Put the purified brine into the crystallizer, turn on the stirring device, control the stirring rate at 150r / min, and add anhydrous ethanol with a volume fraction of 20% after the system is stable. Under the condition of keeping stirring, the sodium hydroxide solution prepared above was slowly added dropwise into the brine at a titration ra...

Embodiment 2

[0039] First, take 100ml of salt field brine, measure the concentration of magnesium ions in the salt field brine, add a certain volume of deionized water to dilute, and adjust the concentration of magnesium ions in the brine to 4mol / L. Configure 100ml of sodium hydroxide solution so that the molar ratio of magnesium ions to sodium hydroxide is 8.

[0040] Add the prepared brine to sodium hypochlorite for purification treatment, the volume ratio of sodium hypochlorite to brine is 1:1000, turn on the stirring device, the stirring speed is 100r / min, the stirring time is 10min, and then keep the settling time for 3h.

[0041] Put the purified brine into the crystallizer, turn on the stirring device, control the stirring rate at 100r / min, and add anhydrous ethanol with a volume fraction of 15% after the system is stable. Under the condition of keeping stirring, the sodium hydroxide solution configured above was slowly added dropwise into the brine at a titration rate of 10 d / min, ...

Embodiment 3

[0047] First, take 200ml of brine from the salt field, measure the concentration of magnesium ions in the brine of the salt field, add a certain volume of deionized water to dilute, and adjust the concentration of magnesium ions in the brine to 3mol / L. Configure 200ml of sodium hydroxide solution so that the molar ratio of magnesium ions to sodium hydroxide is 7.

[0048] Add the prepared brine to sodium hypochlorite for purification treatment, the volume ratio of sodium hypochlorite to brine is 1:1000, turn on the stirring device, the stirring speed is 150r / min, the stirring time is 15min, and then keep the settling time for 3.5h.

[0049] Put the purified brine into the crystallizer, turn on the stirring device, control the stirring rate at 150r / min, and add anhydrous ethanol with a volume fraction of 20% after the system is stable. Under the condition of keeping stirring, the sodium hydroxide solution configured above was slowly added dropwise into the brine at a titration ...

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Abstract

The invention discloses a method for preparing magnesium oxide crystal whiskers from brine through a hydrothermal-basic magnesium chloride precursor. The method includes the following steps of 1) selecting a brine raw material; 2) purifying brine raw materials; 3) adding absolute ethyl alcohol; 4) reacting crystallization; 5) conducting a hydrothermal reaction; 6) preparing precursor basic-magnesium-chloride crystal whiskers; 7) preparing the magnesium oxide crystal whiskers. According to the method for preparing the magnesium oxide crystal whiskers from the brine through a hydrothermal-basicmagnesium chloride precursor, the brine serves as the raw material, it is achieved that brine chemical resources are extracted and recycled, and meanwhile environment pollution caused by brine discharging is reduced; the technology method is simple, the production cost is low, and the magnesium oxide crystal whiskers prepared with the method are good in crystalline form and high in purity.

Description

technical field [0001] The invention belongs to the technical field of marine chemical industry, in particular to a method for preparing magnesium oxide whiskers from brine by using a hydrothermal-basic magnesium chloride precursor. Background technique [0002] Magnesium oxide whiskers are a kind of inorganic whisker materials with great development potential. Compared with silicon carbide whiskers, silicon nitride whiskers, and potassium titanate whiskers, the raw materials for preparing magnesium oxide whiskers are cheap and easy to obtain. . In particular, MgO whiskers have a high melting point and are not oxidized at high temperatures, making them have broad application prospects in the field of high-temperature composite materials. As a new multifunctional inorganic material, magnesium oxide whisker has good heat resistance (melting point as high as 2850°C), insulation, stability, and thermal conductivity (three times the thermal conductivity of alumina) among many ma...

Claims

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Application Information

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IPC IPC(8): C30B29/16C30B29/62C30B7/10C30B1/00
CPCC30B1/00C30B7/10C30B29/16C30B29/62
Inventor 路绍琰张辉王俐聪刘伟武海虹骆碧君张琦黄西平
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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