Method for preparing high-purity magnesium oxide by taking bischofite as raw material

A bischofite and magnesia technology, applied in the direction of magnesia, can solve the problems of waste of resources, damage of excess magnesium, etc.

Active Publication Date: 2021-06-08
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of "magnesium damage" caused by excessive salt lake magnesium resources in the above-mentioned prior art an

Method used

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  • Method for preparing high-purity magnesium oxide by taking bischofite as raw material
  • Method for preparing high-purity magnesium oxide by taking bischofite as raw material
  • Method for preparing high-purity magnesium oxide by taking bischofite as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 10g of bischofite, put the bischofite into a high-temperature furnace, and raise the temperature to 700°C, 800°C, and 900°C at a rate of 5°C / min in an air atmosphere, and keep the bischofite for 2 hours. , take out the calcined product, clean the calcined product in an ultrasonic cleaner for 2 hours, filter and wash it with water, dry it in an oven for 2 hours, and then place it in a muffle furnace for calcination at 700°C for 1 hour to obtain the target product magnesium oxide.

[0033] Weigh (5±0.0002)g sample, put it into a 250ml beaker, add 55ml hydrochloric acid solution, stir well until completely dissolved, filter with medium-speed quantitative filter paper to remove hydrochloric acid insoluble matter. Transfer the filtrate into a 500ml volumetric flask, add water to dilute to the mark, and record it as solution A.

[0034]Pipette 25ml of solution A into a 250ml volumetric flask, dilute with water to the mark. Use a pipette to pipette 25ml of this solution...

Embodiment 2

[0041] Weigh 10g of bischofite, put the bischofite into a high-temperature furnace, raise the temperature to 700°C at a rate of 5, 10, and 15°C / min in an air atmosphere, keep the bischofite for 2 hours, and take out Calcined product, XRD detection is carried out to the product obtained, such as figure 1 shown. The calcined product was cleaned in an ultrasonic cleaner for 2 hours, filtered and washed with water, dried in an oven for 2 hours, and then calcined in a muffle furnace at 700 for 1 hour to obtain the target product magnesium oxide.

[0042] Weigh (5±0.0002)g sample, put it into a 250ml beaker, add 55ml hydrochloric acid solution, stir well until completely dissolved, filter with medium-speed quantitative filter paper to remove hydrochloric acid insoluble matter. Transfer the filtrate into a 500ml volumetric flask, add water to dilute to the mark, and record it as solution A.

[0043] Pipette 25ml of solution A into a 250ml volumetric flask, dilute with water to the ...

Embodiment 3

[0050] Weigh 10g bischofite, put the bischofite into a high-temperature furnace, raise the temperature up to 700°C at a rate of 5°C / min under air and argon atmosphere, keep the bischofite for 2 hours, and take out the calcined product , carry out XRD detection to the obtained product, such as figure 2 shown. The calcined product was cleaned in an ultrasonic cleaner for 2 hours, filtered and washed with water, dried in an oven for 2 hours, and then calcined in a muffle furnace at 700°C for 1 hour to obtain the target product magnesium oxide.

[0051] Weigh (5±0.0002)g sample, put it into a 250ml beaker, add 55ml hydrochloric acid solution, stir well until completely dissolved, filter with medium-speed quantitative filter paper to remove hydrochloric acid insoluble matter. Transfer the filtrate into a 500ml volumetric flask, add water to dilute to the mark, and record it as solution A.

[0052] Pipette 25ml of solution A into a 250ml volumetric flask, dilute with water to the...

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Abstract

The invention relates to a method for preparing high-purity magnesium oxide by taking bischofite as a raw material. The method comprises the following steps: heating bischofite in a high-temperature furnace to 700-900 DEG C at a heating rate of 5-15 DEG C/min, and carrying out primary calcination for 0.5-5 hours to obtain a primary calcined product; and carrying out ultrasonic cleaning on the primary calcined product in water, carrying out suction filtration and water washing, performing drying, performing heating to 700-900 DEG C in a muffle furnace, and carrying out secondary calcination for 0.5-2.5 hours to obtain the high-purity magnesium oxide. According to the method for preparing the high-purity magnesium oxide by taking bischofite as the raw material, comprehensive utilization of salt lake magnesium resources is realized while the ecological environment is protected, and the high-purity magnesium oxide is prepared by a process of calcination-impurity removal (ultrasonic treatment and suction filtration and water washing)-calcination; and the titration of the purity by the EDTA volumetric method shows that the high-purity magnesium oxide with the purity higher than 98% can be obtained, and an effective way is provided for the comprehensive and efficient utilization of salt lake magnesium resources.

Description

technical field [0001] The present invention relates to inorganic materials, more specifically to a method for preparing high-purity magnesium oxide using bischofite as raw material. Background technique [0002] There are more than 100 large and small salt lakes in Qinghai, Chaka Salt Lake, Chaerhan Salt Lake and Keke Salt Lake distributed in the Qaidam Basin are the largest and most famous salt lakes. One of the larger salt lakes holds all the salt the world can use for decades or even centuries. Therefore, the salt lake resource is the largest resource in Qinghai, ranking first in the country. Salt lake resources in Qinghai are characterized by huge reserves, high quality, and multi-component symbiosis of natural resources such as potassium, sodium, magnesium, boron, lithium, strontium, sulfur, and bromine. For a long time, limited by economic conditions, the development of salt lakes has been mainly to produce potassium chloride, and the utilization of other associated...

Claims

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Application Information

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IPC IPC(8): C01F5/06
CPCC01F5/06C01P2002/72C01P2006/80Y02P20/133
Inventor 唐忠锋刘伟华李萍高莉王建强钱渊
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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