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A modified carbonaceous chute and its preparation method

A modified carbon and chute technology, applied in the field of modified carbon chute and its preparation, can solve the problems of easy cracks, easy burn-through of carbon chute, temperature rise, etc., achieve high mechanical strength and bending strength, improve The frequency of use and the effect of improving corrosion resistance

Active Publication Date: 2022-03-01
LANXING SILICON MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the continuous furnace holes, the existing carbonaceous chute has a fast oxidation speed, and the carbonaceous chute is easy to burn through, resulting in repeated shutdowns or burnt equipment, which seriously affects the normal production of the electric furnace
Furthermore, when the molten metal silicon flows through the carbonaceous chute, the temperature rises sharply, which is prone to problems such as cracks and fractures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Add an aqueous solution of paraformaldehyde (40 degree of polymerization) and methanesulfonic acid to coal tar pitch (softening point: 80°C), and heat to 110°C for 2 hours to obtain modified coal pitch. The weight ratio of coal tar pitch to paraformaldehyde and methanesulfonic acid is 10:2.5:0.1.

[0031] (2) First, 30 parts by weight of graphite powder, 40 parts by weight of needle coke (the density of needle coke is 2.1g / cm 3 , ash content ≤ 1.0%, aspect ratio 1.8) into the kneader for dry mixing, the temperature of dry mixing is 150 ℃, the time is 60min, after mixing evenly, then add 20 parts by weight of modified coal tar pitch for wet mixing, wet mixing The temperature is 150°C and the time is 50min. After wet mixing, it is placed in an extruder for extrusion molding. The extrusion molding pressure is 10MPa to obtain a cylindrical blank with a diameter of 80mm and a length of 80mm;

[0032] (3) The blank obtained in step (2) is placed in a roasting furnace for...

Embodiment 2

[0037] (1) Add an aqueous solution of paraformaldehyde (polymerization degree 40) and methanesulfonic acid to coal tar pitch (softening point: 85°C), and heat to 120°C for 1.5 hours to obtain modified coal pitch. The weight ratio of coal tar pitch to paraformaldehyde and methanesulfonic acid is 10.0:3.0:0.08.

[0038] (2) First, 35 parts by weight of graphite powder, 45 parts by weight of needle coke (the density of needle coke is 2.1g / cm 3 , ash content ≤ 1.0%, aspect ratio 1.8) into the kneader for dry mixing, the temperature of dry mixing is 140 ℃, the time is 60min, after mixing evenly, then add 25 parts by weight of modified coal tar pitch for wet mixing, wet mixing The temperature is 140°C and the time is 50min. After wet mixing, it is placed in an extruder for extrusion molding. The extrusion molding pressure is 10MPa to obtain a cylindrical blank with a diameter of 80mm and a length of 80mm;

[0039] (3) The blank obtained in step (2) is placed in a roasting furnace f...

Embodiment 3

[0044] (1) Add an aqueous solution of paraformaldehyde (polymerization degree 40) and methanesulfonic acid to coal tar pitch (softening point: 80°C), and heat to 110°C for 2 hours to obtain modified coal pitch; coal tar pitch and paraformaldehyde , The weight ratio of methanesulfonic acid is 10.0:3.0:0.07.

[0045] (2) First, 35 parts by weight of graphite powder, 50 parts by weight of needle coke (the density of needle coke is 2.1g / cm 3 , ash content ≤ 1.0%, aspect ratio 1.8) into the kneader for dry mixing, the temperature of dry mixing is 145 ℃, the time is 60min, after mixing evenly, then add 23 parts by weight of modified coal tar pitch for wet mixing, wet mixing The temperature is 155°C and the time is 50min. After wet mixing, it is placed in an extruder for extrusion molding. The extrusion molding pressure is 10Mpa to obtain a cylindrical blank with a diameter of 80mm and a length of 80mm;

[0046] (3) The blank obtained in step (2) is placed in a roasting furnace for ...

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Abstract

The invention discloses a modified carbonaceous chute and a preparation method thereof. The carbonaceous chute includes castables and graphite materials as aggregates. The weight ratio of graphite materials to castables is 1: (3-7), wherein the graphite materials include the following raw material components in parts by weight: graphite 25-40 parts; 30-55 parts of needle coke; 15-25 parts of asphalt. The carbonaceous chute of the present invention can reduce the oxidation speed of the carbonaceous chute, resist the erosion of high-temperature baked materials, greatly improve the service life, and have very high mechanical strength and bending strength, and are not prone to cracks and fractures.

Description

technical field [0001] The invention relates to a modified carbonaceous chute and a preparation method thereof, in particular to a modified carbonaceous chute with high temperature resistance and good toughness and a preparation method thereof. Background technique [0002] Submerged arc furnace, also known as electric arc furnace or resistance electric furnace, is mainly used to produce industrial silicon, calcium carbide, yellow phosphorus and other products, and is also commonly known as electric furnace in this industry. [0003] The inner structure of the furnace is mainly composed of the furnace shell, the carbon bricks in the furnace, the furnace eye and the furnace outlet channel. For example, in the production of silicon metal, the silicon dioxide in the silica is reduced with a carbonaceous reducing agent in the crucible area of ​​the furnace to generate molten metal silicon (up to 1500°C), which then flows into the silicon bag through the chute of the furnace eye....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/52C04B35/622
CPCC04B35/66C04B35/52C04B35/622C04B2235/425C04B2235/422
Inventor 王宝庆高建军张正宏聂恒声
Owner LANXING SILICON MATERIALS