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Doped boron nitride capable of removing heavy metal in high-temperature flue gas and preparation method thereof

A high-temperature flue gas, boron nitride technology, applied in the field of doping boron nitride, can solve problems such as increasing production cost, and achieve the effects of easy operation, improved adsorption capacity and adsorption selectivity, and high yield

Inactive Publication Date: 2019-09-06
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the wastewater generated by the introduced washing needs to be treated again, which increases the production cost to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Preparation of phosphorus-doped porous boron nitride,

[0031] (1) Add 12.6g of melamine, 12.4g of boric acid and 0.62g of dopant phosphorus into 500ml of deionized water, stir well so that the three raw materials are evenly distributed in the water, and place it in a constant temperature shaker at 85°C Shake at constant temperature and keep warm for 8 hours;

[0032] (2) Stop shaking the solution prepared in step (1) and lower the temperature to 20-30° C. by slow cooling to 20-30° C., flocs are produced, and the phosphorus-doped boron nitride precursor is obtained after suction filtration;

[0033] (3) Dry the phosphorus-doped boron nitride precursor obtained in step (2) by freeze-drying for 24 hours to obtain the dry phosphorus-doped boron nitride precursor required for the experiment;

[0034] (4) Grinding the dry phosphorus-doped boron nitride precursor obtained in step (3) with an agate mortar to obtain a powdery phosphorus-doped boron nitride precursor...

Embodiment (2

[0043] Example (2): Preparation of sulfur-doped porous boron nitride

[0044] (1) Add 12.6g of melamine, 12.4g of boric acid and 0.64g of dopant sulfur into 500ml of deionized water, stir well so that the three raw materials are evenly distributed in the water, place it in a constant temperature shaker, and heat it at 85°C Shake at constant temperature and keep warm for 8 hours;

[0045] (2) Stop shaking the solution configured in step (1) and lower the temperature to 20-30°C by slow cooling,

[0046] There are flocs, and the sulfur-doped boron nitride precursor is obtained after suction filtration;

[0047] (3) Dry the sulfur-doped boron nitride precursor obtained in step (2) by freeze-drying for 24 hours to obtain the dry sulfur-doped boron nitride precursor required for the experiment;

[0048] (4) Grinding the dry sulfur-doped boron nitride precursor obtained in step (3) with an agate mortar to obtain a powdery sulfur-doped boron nitride precursor;

[0049] (5) The powder...

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Abstract

The invention provides a doped boron nitride capable of removing heavy metal in high-temperature flue gas. The doped boron nitride comprises, by molar ratio, 0.1-1 mol of a doping substance, 1-5 mol of melamine and 1-5 mol of boric acid, wherein the raw materials of the melamine and boric acid are required for preparation of boron nitride. A preparation method of the doped boron nitride is also provided. The method includes the step of introducing the doping substance during preparation of a first-step precursor on the basis of preparation of the porous boron nitride based on a two-step approach to prepare a porous boron nitride material having a high specific surface area and high porosity, the adsorption selectivity of the heavy metal in the high-temperature flue gas according to different doping substances is different, and the doped boron nitride has higher adsorption capacity for the heavy metal in the high-temperature flue gas than undoped porous boron nitride.

Description

technical field [0001] The invention provides a doped boron nitride capable of removing heavy metals in high-temperature flue gas, and a preparation method of the doped boron nitride. Background technique [0002] With the development of China's urban modernization, my country's sewage treatment volume has increased year by year, and sludge as a by-product of sewage treatment has also increased. According to statistics, in 2018, my country's annual sludge output was about 40 million tons (based on a moisture content of 80%), and the treatment rate was less than 30%. The content of heavy metals in my country's sludge is relatively high, and some relatively prominent heavy metals such as Zn can reach several thousand ppm, and the average value can reach 1450 mg / kg. Incineration, as a technical method of sludge disposal with the best effect of "reduction, harmlessness, and resource utilization", has developed rapidly in the world. The "Guidelines for Best Available Technologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/28B01J20/30B01D53/02F23J15/00
CPCB01D53/02B01D2257/60B01D2258/0283B01J20/02B01J20/0248B01J20/0259B01J20/28011B01J20/30B01J20/3021B01J20/3071B01J20/3078F23J15/003
Inventor 李彦龙李洪喜李润东苏欣王子曦
Owner SHENYANG AEROSPACE UNIVERSITY
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