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A process for preparing high-purity silicon steel grade magnesium oxide from magnesium hydroxide

A magnesium hydroxide and silicon steel grade technology, applied in the direction of magnesium oxide, etc., can solve the problems of long process flow, unstable product quality, and low purity, and achieve the effect of short process flow, meeting industrial production requirements, and high purity

Inactive Publication Date: 2017-01-04
CENT SOUTH UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] However, the current process for producing silicon steel grade magnesia is long, and the purity is not high, and the product quality is unstable, which cannot meet the requirements of the fast-growing domestic production and development of oriented silicon steel sheets. The method for producing silicon steel grade magnesia from salt lake magnesium resources is still unclear. less

Method used

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  • A process for preparing high-purity silicon steel grade magnesium oxide from magnesium hydroxide
  • A process for preparing high-purity silicon steel grade magnesium oxide from magnesium hydroxide
  • A process for preparing high-purity silicon steel grade magnesium oxide from magnesium hydroxide

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Effect test

Embodiment 1

[0028] Put magnesium hydroxide into the muffle furnace, set the heating rate to 5°C / min, raise the temperature to 650°C, and keep it warm for 0.5h; take 10g of magnesium oxide obtained by light burning, put it into the reaction kettle, and add 200mL of deionized water, Raise the temperature to 80°C and stir thoroughly. After reacting for 0.5 hours, cool down the reactor to 75°C. At this time, adjust the ammonium bicarbonate metering pump, and dropwise add hydrogen carbonate with a concentration of 50g / L to the reactor at a rate of 0.2L / h. ammonium solution, fully stirred and reacted for 3 hours; the resulting suspension was filtered, washed, and dried at 100°C for 24 hours to obtain a precursor; the obtained precursor was placed in a muffle furnace, and the heating rate was set to 5°C / min. Raise the temperature to 1100° C. and keep it warm for 1.5 hours to obtain high-purity silicon steel grade magnesium oxide with a purity of 99.5%. The product profile is as follows figure 1...

Embodiment 2

[0030] Put magnesium hydroxide into the muffle furnace, set the heating rate to 7°C / min, raise the temperature to 550°C, and keep it warm for 2 hours; take 10g of magnesium oxide obtained by light burning, put it into the reaction kettle, and add 250mL of deionized water to heat up Fully stir at 85°C and react for 1 hour; after that, cool down the reactor to 60°C, at this time, adjust the ammonium bicarbonate metering pump, and add ammonium bicarbonate with a concentration of 50g / L dropwise to the reactor at a rate of 0.2L / h solution, fully stirred and reacted for 3 hours; the resulting suspension was filtered, washed, and dried at 110°C for 24 hours to obtain a precursor; to 1150° C., heat preservation for 1 hour, and obtain high-purity silicon steel-grade magnesium oxide with a purity of 99.4%. The magnesium oxide product has regular appearance and uniform particle size.

Embodiment 3

[0032] Put magnesium hydroxide into the muffle furnace, set the heating rate to 9°C / min, raise the temperature to 700°C, and keep it warm for 1.5h; take 10g of magnesium oxide obtained by light burning, put it into the reaction kettle, and add 150mL of deionized water, Raise the temperature to 75°C and stir thoroughly, and react for 1 hour; after that, cool down the reactor to 65°C, at this time, adjust the ammonium bicarbonate metering pump, and dropwise add hydrogen carbonate with a concentration of 50g / L to the reactor at a rate of 0.3L / h Ammonium solution, fully stirred and reacted for 2.5 hours; the resulting suspension was filtered, washed, and dried at 110°C for 20 hours to obtain a precursor; the obtained precursor was placed in a muffle furnace, and the heating rate was set to 4°C / min , the temperature was raised to 1050° C., and the temperature was maintained for 1.5 hours to obtain high-purity silicon steel grade magnesium oxide with a purity of 99.4%. The magnesium ...

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Abstract

The invention discloses a process for preparing high-purity silicon steel magnesium oxide from magnesium hydroxide. The process comprises the following steps: performing light roasting on magnesium hydroxide, adding magnesium hydroxide into water, heating to hydrate, further cooling, and slowly adding an ammonium bicarbonate solution into water to carbonize, thereby obtaining a suspension;filtering the suspension, washing and drying the residues obtained after filtration, and further roasting at high temperature, thereby obtaining the high-purity silicon steel magnesium oxide. According to the process, magnesium hydroxide is adopted as a raw material to prepare silicon steel magnesium oxide which is regular in morphology and high in purity, the process procedure is short, and the prepared magnesium oxide is stable in quality and high in production efficiency, and the industrial production requirements are met.

Description

technical field [0001] The invention relates to a process for preparing high-purity silicon steel-grade magnesium oxide from magnesium hydroxide, which belongs to the technical field of magnesium oxide preparation. Background technique [0002] The magnesium resources in Chaerhan Salt Lake in Qinghai, my country are extremely rich, and a large amount of magnesium chloride hexahydrate will be produced while developing potash fertilizers in Chaerhan Salt Lake, causing magnesium damage. At present, Qinghai Western Magnesium Industry Co., Ltd. has used the ammonia-based magnesium precipitation process for large-scale production of magnesium hydroxide. In order to better develop the value of magnesium compounds, a process for preparing high-purity silicon steel grade magnesium oxide from magnesium hydroxide has been developed. have great economic benefits. [0003] Silicon steel grade magnesia is a kind of light magnesia. Its purity requirement is ≥98%. It has good suspension pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/02
CPCC01F5/02
Inventor 徐徽廖浩然程俊峰李贵
Owner CENT SOUTH UNIV
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