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A kind of environment-friendly high-life repairing furnace sand and its production method

A production method and environment-friendly technology, which is applied in the field of refractory materials for converter protection in iron and steel smelting, can solve the problems of unsatisfactory thermal shock resistance and oxidation resistance of refractory materials, high labor intensity, and low converter furnace life. Achieve outstanding environmental protection effect, short sintering time and rapid sintering reaction

Active Publication Date: 2018-02-09
鞍山市和丰耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 2) Synthetic resin is made by the reaction of phenol and formaldehyde. It can be well mixed with refractory particles at room temperature. After carbonization, the residual carbon rate is high. The current production of magnesia carbon bricks and furnace sand is very large; but it The glassy network structure formed after carbonization is not ideal for the thermal shock resistance and oxidation resistance of refractory materials. In addition, the smell of phenol has also caused strong dissatisfaction from many parties.
[0009] 1) Since pitch, coal tar or phenolic resin are mainly used as carbon sources, a large amount of smoke is generated during the furnace repair process, which pollutes the environment;
[0010] 2) The corrosion resistance is not good, and the number of times of use is low, resulting in large consumption of refractory materials and high labor intensity;
[0011] 3) Affect the further increase of the overall furnace life, especially the low life of the converter for smelting pure steel;

Method used

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  • A kind of environment-friendly high-life repairing furnace sand and its production method
  • A kind of environment-friendly high-life repairing furnace sand and its production method
  • A kind of environment-friendly high-life repairing furnace sand and its production method

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Experimental program
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Effect test

Embodiment 1

[0054] Take the repairing sand for a 70-ton converter in a steel plant as an example. The conditions are shown in Table 2:

[0055] Table 2 Production conditions of a 70-ton converter in a steel plant

[0056]

[0057]

[0058] In order to achieve the above purpose, the furnace sand for the converter can be realized through the following technical solutions:

[0059] The 70-ton converter sand is an environmentally friendly and long-life repairing sand, which is prepared from the following raw materials in parts by weight: MS91 dead-burned magnesia: 65 parts, CARBORES F 112M carbon-containing resin powder and ultra-fine carbon black N330. Carbon source: 12 parts, pitch fiber: 0.01 parts, composite fluidizing agent composed of refined naphthalene and allyl polyoxyethylene ether: 2.5 parts, composite sintering agent composed of silicon carbide micropowder and borax: 0.2 parts, metal aluminum powder and Composite antioxidant composed of metal silicon powder: 2.0 parts.

...

Embodiment 2

[0071] Take the furnace sand for 300 tons converter in a steel plant as an example. The conditions are shown in Table 3:

[0072] Table 3 Production conditions of a 300-ton converter in a steel plant

[0073] 1

Nominal capacity

210t

2

Furnace ratio

1.0m 3 / t.

3

Average tapping amount

215t

4

Maximum tapping amount

230t

5

Average smelting cycle

45min, of which pure oxygen blowing time: 15min

6

blowing mode

top and bottom blow

7

Tapping temperature

1630~1690℃

8

Final slag alkalinity

2.8~4.0

9

furnace age

10000 furnaces

10

Tapping time

4.5~8min

[0074] In order to achieve the above purpose, the furnace sand for the converter can be realized through the following technical solutions:

[0075] The 300-ton converter sand is an environmentally friendly and long-life repairing sand, which is prepared from the following raw mate...

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Abstract

The invention relates to environment-friendly type long-life fettling sand, which is prepared from the following raw materials (by weight): 65-90 parts of sintered magnesia, 12-20 parts of a composite carbon source composed of carbon-containing resin powder and carbon black, 0.01-0.20 part of pitch fiber, 2.5-4.5 parts of a composite fluidizing reagent composed of refined naphthalene and allyl polyethenoxy ether, 0.2-1.5 parts of a composite sintering agent composed of silicon carbide micro-powder and borax, and 2.0-5.5 parts of a composite antioxidant composed of metallic aluminum powder and metallic silicon powder. In comparison with the prior art, the invention has the following beneficial effects: sintering time is short; scour resistance and spalling resistance are greatly improved; especially the environmental protection effect is prominent; smoke amount is obviously reduced; there is no peculiar smell; total service life is raised by 25-32%; fettling time is reduced; labor intensity is lowered; and win-win relationship between steel mills and refractory suppliers is realized.

Description

technical field [0001] The invention relates to the technical field of refractory materials used for furnace protection of iron and steel smelting converters, in particular to an environment-friendly and long-life repairing sand and a production method thereof. Background technique [0002] Furnace repair sand for converter protection is the most widely used refractory material for converter protection. Its service life directly affects the effect of converter protection and also affects the furnace life of the converter. [0003] The principle of repairing sand is the process of interfacial reaction between magnesia particles and carbonaceous materials softened and melted at high temperature. At the same time, to resist the erosion of molten steel, in order to make the formed magnesia-carbon sintered body strong and uniform in structure, a fluidizing agent should be added to reduce the surface tension of magnesia particles, so that magnesia particles can be fully sintered. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
CPCC04B35/043
Inventor 李涛孙逊李勇付凤超刘习胜
Owner 鞍山市和丰耐火材料有限公司
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