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Opoka-base carbon composite material and preparation method thereof

An opal shale and carbon composite material technology, applied in the field of mineral materials, can solve problems such as increasing the cost of hydrothermal carbonization, and achieve the effects of low cost, excellent adsorption performance, and large specific surface area

Active Publication Date: 2015-08-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only increases the cost of hydrothermal carbonization, but also the waste liquid after carbonization will bring new environmental problems

Method used

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  • Opoka-base carbon composite material and preparation method thereof
  • Opoka-base carbon composite material and preparation method thereof

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preparation example Construction

[0028] A method for preparing an opal shale-based carbon composite material, comprising the following steps:

[0029] a. The opal shale raw ore is crushed to 2 mixture;

[0030] b. The powder obtained after grinding the purified opal shale to <100 mesh can be used directly, or the powder can be calcined in a muffle furnace at 300-1000°C for 2-4 hours for thermal activation treatment to improve the surface activity of opal ;

[0031] c. Slurry preparation: disperse opal shale powder and water-soluble biomass carbon source in water at a mass ratio of 20-0.3, the mass ratio of opal shale to water is 0.005-0.15, and mechanically stir for 2-4 hours to form a slurry material;

[0032] d. Transfer the mixed slurry to a hydrothermal reaction kettle, and hydrothermally carbonize at 150-300°C for 4-72 hours;

[0033] e. After natural cooling, open the reaction kettle, centrifugally wash until neutral, and dry at 60-80°C to obtain an opal shale-based carbon composite material.

Embodiment 1

[0035] Crush the raw opal shale to 100 mesh, add water to make a suspension with a solid content of 20%, stir mechanically for 2 hours, settle naturally at room temperature for 1 minute, collect the upper liquid, wash and dry it by centrifugation, and complete the purification process of opal shale. Take 2g of the purified opal shale, grind it to <120 mesh, transfer it into a beaker, add 8g of sucrose and 30ml of water, and stir it vigorously for 4 hours to form a slurry. Transfer the slurry to a reaction kettle lined with tetrafluoroethylene, first raise the temperature to 180°C, keep the temperature constant for 30 minutes, then continue to raise the temperature to 200°C, keep the temperature for 14 hours, then take out the reaction kettle to cool naturally. Open the reaction kettle, remove the dry hard oil film in the upper layer of the mixed solution, centrifuge and wash to neutral, wash and centrifuge with absolute ethanol 3 times, dry at 60°C, and after cooling, the opal ...

Embodiment 2

[0038] Crush the raw opal shale to 100 mesh, add water to make a suspension with a solid content of 20%, stir mechanically for 2 hours, settle naturally at room temperature for 1 minute, collect the upper liquid, wash and dry it by centrifugation, and complete the purification process of opal shale. After the purified opal shale is ground, it is placed in a muffle furnace for calcination at 500° C. for 2 hours to obtain heat-activated opal shale powder. Weigh 0.5g of heat-activated opal shale powder, add 2g of glucose and 80ml of water, and stir vigorously for 2 hours to form a slurry. Transfer the slurry to a reaction kettle lined with tetrafluoroethylene, first raise the temperature to 160°C, keep the temperature constant for 30 minutes, then continue to raise the temperature to 180°C, and keep the temperature constant for 6 hours, then take out the reaction kettle and let it cool naturally. Open the reaction kettle, remove the dry and hard oil film in the upper layer of the...

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Abstract

The invention relates to an opoka-base carbon composite material and a preparation method thereof. The preparation method comprises the following steps: properly pretreating the opoka, proportionally mixing with a biomass water solution, and preparing the opoka-base carbon composite material by a nonhomogeneous hydrothermal synthesis process. The method maintains the abundant pore structure of the opoka, and fully utilizes the particular surface electric field of the opoka to implement the firm compounding of the mineral base and carbon material. The obtained composite material has excellent functions of adsorption, filtration aiding and heat insulation. Compared with the single opoka or hydrothermal carbon microspheres, the composite material has higher adsorption capacity, can be widely used in purifying air and water, and is especially used for treating pollutants in water bodies. The silicon-carbon composite material obtained after reduction can also be used as a battery high-performance negative pole material. The raw material is the cheap and accessible natural mineral with abundant resources and low production cost. The preparation method has the advantages of simple preparation technique, no need of other catalysts, low reaction temperature and environment friendliness.

Description

Technical field: [0001] The invention relates to a mineral material, especially an opal shale-based carbon composite material. A cheap and efficient porous composite material is obtained by using cheap biomass carbonaceous raw materials to carry out hydrothermal carbonization reaction on opal. Background technique: [0002] Opal Shale (SiO 2 ·nH 2 O) is a fine hot body formed by volcanic ash burning violently in the air and falling into the bottom of the lake, and then formed after a long geological process. It belongs to high-silicon and low-aluminum amorphous minerals. Because the particle size reaches the clay level, it is also called protein soil. The main component of opal shale is hydrous amorphous SiO 2 material, its activity is better than ordinary SiO 2 , and has the characteristics of small specific gravity, page-like bedding, fine and uniform particle size, loose and porous structure, strong surface electronegativity, and good adsorption. It is an excellent na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/00C01B31/02
Inventor 李芳菲刘森桂思文倪金鑫张敏马佳玉
Owner JILIN UNIV
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