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Method for efficiently producing hexagonal boron nitride and co-producing sodium metaborate from borax

A technology of hexagonal boron nitride and sodium metaborate, applied in the field of functional material preparation, can solve the problems of low boron conversion rate, increase time and cost, waste of resources, etc., and achieve the effects of high purity, reduced time and cost, and easy handling.

Active Publication Date: 2016-07-27
LIAONING SHOUGANG BORON IRON +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The common problem of the above process is that the conversion rate of boron is low, only 40-50% of the boron in the raw material is converted into the target product boron nitride, and the remaining boron remains in the product in other forms and needs to be removed by washing in the subsequent process
This not only increases the time and cost of post-processing of the product, but at the same time most of the boron is directly thrown away as waste, which also causes a waste of resources

Method used

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  • Method for efficiently producing hexagonal boron nitride and co-producing sodium metaborate from borax
  • Method for efficiently producing hexagonal boron nitride and co-producing sodium metaborate from borax

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Mix 4.0g of anhydrous borax and 4.8g of urea by ball milling, pass the mixture through a 200-mesh sieve, move the material under the sieve into a crucible, put it in a roasting furnace, pass in nitrogen protective gas, and heat up to 800°C at a rate of 3°C / min , kept at room temperature for 4 hours, and naturally cooled to room temperature to obtain 3.4 g of a roasted sample; ground, added 50 ml of deionized water, heated to 75 ° C in a water bath, kept stirring for 1.5 h, and filtered; the filter residue was dried at 80 ° C, moved into a crucible, and placed in a roasting furnace. Introduce nitrogen protective gas, heat up to 1200°C, keep warm for 2 hours, and cool naturally to room temperature to obtain hexagonal boron nitride with a yield of 84%; the filtrate is spray-dried and roasted at 500°C to obtain anhydrous sodium metaborate, Its yield was 86%.

[0031] attached figure 1 And attached figure 2 It is the sample XRD spectrogram in this embodiment. figure 1 a ...

Embodiment 2

[0034] Mix 4.0g of anhydrous borax and 7.2g of urea by ball milling, pass the mixture through a 250-mesh sieve, move the material under the sieve into a crucible, put it in a roasting furnace, pass in nitrogen protective gas, and raise the temperature to 900°C at a rate of 4°C / min , kept at room temperature for 4 hours, and naturally cooled to room temperature to obtain 4.47 g of roasted samples; ground, added 112 ml of deionized water, heated to 80 ° C in a water bath, kept stirring for 1 h, and filtered; the filter residue was dried at 80 ° C and moved into a crucible, placed in a roasting furnace, and passed Enter nitrogen protective gas, heat up to 1300°C, keep warm for 4h, and naturally cool to room temperature to obtain hexagonal boron nitride with a yield of 85%; the filtrate is spray-dried and roasted at 600°C to obtain anhydrous sodium metaborate, Its yield was 86%.

[0035] In this embodiment, the comprehensive utilization rate of boron is 85%.

Embodiment 3

[0037] Mix 4.0g of anhydrous borax and 5.3g of ammonium chloride by ball milling, pass the mixture through a 300-mesh sieve, move the material under the sieve into a crucible, place it in a roasting furnace, feed nitrogen protective gas, and heat up to 900°C, keep warm for 3h, cool down to room temperature naturally, and get 3.5g roasted sample; Grind, add 70ml deionized water, heat in water bath to 70°C, keep stirring for 1h, filter; filter residue is dried at 80°C, moved into crucible, and placed in roasting furnace , into a nitrogen protective gas, heated to 1250°C, kept warm for 3 hours, and naturally cooled to room temperature to obtain hexagonal boron nitride with a yield of 80%; the filtrate was spray-dried and roasted at 650°C to obtain anhydrous metaboric acid Sodium, the yield was 82%.

[0038] In this embodiment, the comprehensive utilization rate of boron is 81%.

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Abstract

The invention belongs to the technical field of functional material preparation and discloses a method for efficiently producing hexagonal boron nitride and co-producing sodium metaborate from borax. The method comprises the following steps of: preparing borax and a nitrogen source and feeding into a ball mill for ball milling; mixing uniformly and putting in a roasting furnace; introducing nitrogen or ammonia and performing low-temperature roasting; grinding the roasted material, washing with hot water, filtering and collecting the filter residue and filtrate; drying the filter residue and transferring into a crucible; putting the crucible in the roasting furnace; introducing nitrogen and performing high-temperature roasting; after roasting, naturally cooling to room temperature to obtain hexagonal boron nitride; and drying the filtrate and roasting to obtain anhydrous sodium metaborate. The production method disclosed by the invention can be used for efficiently producing hexagonal boron nitride and co-producing sodium metaborate, the technological conditions are mild, the production process is clean and safe, the utilization rate of the raw material boron is higher than 80%, the product yield is high, a few impurities are contained, and the performance is good.

Description

technical field [0001] The invention belongs to the technical field of functional material preparation, and relates to a method for efficiently producing hexagonal boron nitride and co-producing sodium metaborate by using borax. Background technique [0002] Hexagonal boron nitride is a white powdery solid, which is called "white graphite" because its crystal structure is very similar to graphite. Due to the strong chemical bond between B and N and its special crystal structure, boron nitride exhibits many excellent physical and chemical properties, such as high temperature and high pressure resistance, chemical corrosion resistance, high temperature insulation, good lubricity, medium High child absorption capacity, etc. Therefore, boron nitride is widely used in high-temperature structural materials, heat shielding materials, lubricating materials, high-voltage and high-frequency insulating materials, neutron radiation-proof packaging materials and other fields. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/064C01B35/12
CPCC01B21/0646C01B35/121C01P2002/72
Inventor 孙苒荻周宏强朱高远籍延广赵凯代英秋张红玲王浩宇徐红彬曹丹凤张懿张雪
Owner LIAONING SHOUGANG BORON IRON
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