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A kind of preparation method of cheap boron-containing carbon brick

A low-cost, boron-carbon technology, used in the field of graphite bricks, can solve the problems of high cost and low performance indicators, and achieve the effects of improving service life, good thermal conductivity and thermal expansion performance, and reducing costs.

Active Publication Date: 2020-12-25
永安市鼎丰碳素科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a low-cost method for preparing boron-containing carbon bricks, which can effectively solve the problem of existing boron-containing carbon bricks due to the limitations of raw materials. The performance indicators of the product are low and the cost is high

Method used

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  • A kind of preparation method of cheap boron-containing carbon brick

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preparation example Construction

[0020] The invention discloses a method for preparing a low-cost boron-containing carbon brick, which comprises the following steps:

[0021] (1) Raw material pretreatment: clean the plant straws, dry them at 60-100°C until the water content is ≤5%, initially crush them into 1-20mm sawdust, place them in a carbonization furnace, and raise the temperature to 300°C under the protection of inert gas. ~400°C pyrolysis treatment for 0.1~1h, then heat up to 650~850°C for 1~3h, then cool in the furnace to obtain biochar, and then crush and classify the obtained biochar into particles of different particle sizes: 5~10μm , 30-60μm, 100-300μm, 500-1000μm; preliminarily grind the purchased boron carbide powder into 30-80μm; plant straw materials are wheat straw, rice stalk, corn stalk, corn cob, wood scraps, tree roots and Paper strips, trees or shrubs.

[0022] 2) Mixing and kneading: Add three particle sizes of biochar with different particle sizes to the kneader at a ratio of 0-40% b...

Embodiment 1

[0030] A method for preparing low-cost boron-containing carbon bricks, comprising the following steps:

[0031] (1) Raw material pretreatment: Clean the plant straw, dry it at 60°C until the moisture content is ≤5%, and initially crush it into 1mm sawdust, put it in a carbonization furnace, and heat it up to 320°C for pyrolysis treatment under the protection of inert gas. 0.8h, then heat up to 750°C for 1h, then cool down with the furnace to obtain biochar, and then crush and classify the obtained biochar into particles of different particle sizes: 5~10μm, 30~60μm, 100~300μm, 500~ 1000 μm; the purchased boron carbide powder is preliminarily ground to 45 μm; the plant straw material is wheat straw.

[0032] 2) Mixing and kneading: Add three particle sizes of biochar with different particle sizes to the kneader at a mass percentage of 10%:16%:8%, and then add 10% boron carbide powder, Stir at 150°C for 2.5 hours. After stirring evenly, add the remaining amount of kneading agent...

Embodiment 2

[0039] A method for preparing low-cost boron-containing carbon bricks, comprising the following steps:

[0040] (1) Raw material pretreatment: clean the plant straw, dry it at 65°C until the water content is ≤5%, and initially crush it into 20mm sawdust, put it in a carbonization furnace, and heat it up to 400°C for pyrolysis treatment under the protection of inert gas. 0.1h, then heat up to 650°C for 3h, then cool in the furnace to obtain biochar, and then crush and classify the obtained biochar into particles of different particle sizes: 5~10μm, 30~60μm, 100~300μm, 500~ 1000μm; the purchased boron carbide powder is preliminarily ground to 30μm; the plant straw material is rice straw.

[0041] 2) Mixing and kneading: Add three particle sizes of biochar with different particle sizes to the kneader at a mass percentage of 30%:10%:5%, and then add 3% boron carbide powder, Stir at 100°C for 0.5h. After stirring evenly, add the remaining amount of kneading agent and continue knea...

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Abstract

The invention discloses a preparation method of a boron-containing carbon brick with a low price. The preparation method comprises the following steps: (1) raw material pretreatment; 2) mixing and kneading, namely adding three kinds of biomass charcoal with different particle sizes into a mixing and kneading machine according to a mass percentage ratio of (0-40%):(10-20%):(5-15%); 3) molding, namely placing the prepared mixed and kneaded paste material into a die for extrusion or vibration molding; 4) roasting; 5) impregnation; 6) secondary roasting, namely placing an impregnated product intoa roasting furnace, and roasting the impregnated product at 800-1200 DEG C for 3-12h; and 7) machining, namely machining a carbon block material into a required shape by using a machine tool. The preparation method breaks through an original technical process, and agricultural waste straws are used as raw materials, so that the cost is greatly reduced, and the effects of turning wastes into wealthand protecting the environment can be achieved; and in addition, the product prepared by using the preparation method has higher volume density as well as flexural and compressive strength and betterheat conduction and heat expansion properties, and the service life of the carbon brick is greatly prolonged due to the properties.

Description

technical field [0001] The invention relates to the technology in the field of graphite bricks, in particular to a method for preparing low-cost boron-containing carbon bricks. Background technique [0002] With the continuous development of society, the demand for energy is gradually increasing, and fossil fuels are gradually exhausted, so it is urgent to find better and more efficient clean energy. Nuclear energy is one of the important options to solve the current energy and environmental crisis in our country. Shandong Shidaowan Nuclear Power Plant uses a new type of modular high-temperature gas-cooled reactor independently developed and designed by Tsinghua University. It has high safety and can provide up to 900 ℃ The heat of high-temperature process marks that the fourth-generation high-temperature gas-cooled reactor is entering commercialization. [0003] The main structure of the high-temperature gas-cooled reactor includes fuel elements, core, neutron reflector, n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/52C04B35/622C04B41/87
CPCC04B35/52C04B35/521C04B35/62204C04B35/62209C04B35/62213C04B41/5053C04B41/87C04B2235/3821C04B2235/77C04B2235/9607
Inventor 李芳王铁军
Owner 永安市鼎丰碳素科技有限公司
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