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Rapid-hardening blast furnace hearth repair material and preparation method thereof

A blast furnace furnace and repairing material technology, applied in the field of metallurgical refractory materials, can solve problems such as the fit of ceramic cups and residual carbon bricks, threats to the safe production of blast furnaces, and the rise in temperature of hearth side walls. Good anti-erosion and anti-erosion properties, fast hardening, and prolonging the service life

Active Publication Date: 2020-05-05
CHINA JINGYE ENG TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, there are many blast furnaces in China that the temperature of the side wall of the hearth has risen sharply shortly after the furnace is opened, which seriously threatens the safe production of the blast furnace and the service life of the first generation furnace.
After research and analysis, the hearth structure of bricklaying or ceramic cups commonly used in blast furnaces not only needs to be customized in advance, but the construction time is long, and the thickness of brick joints in various parts of the masonry has a greater impact on the longevity of the blast furnace. Generally, the hearth is eroded They all start from the gaps in the masonry, and it is difficult to solve the fit problem between the ceramic cup and the residual carbon brick when the hearth is repaired
The existence of these production hidden dangers has brought huge economic losses to the enterprise, and effective measures should be taken to solve this problem

Method used

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  • Rapid-hardening blast furnace hearth repair material and preparation method thereof
  • Rapid-hardening blast furnace hearth repair material and preparation method thereof

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Effect test

preparation example Construction

[0042] The preparation method of rapid hardening type blast furnace hearth repair material of the present invention, the steps are as follows:

[0043] In parts by weight, first prepare the above-mentioned composite ultrafine powder, dispersant, and coagulant according to the ratio described, and uniformly mix for 5-8 minutes in a double-helix conical mixer to obtain a mixed powder, and take out the mixed powder;

[0044] Then prepare the solid material except the composite superfine powder according to the stated ratio, and uniformly mix with the taken-out mixed powder in a planetary forced mixer for 3-5 minutes to obtain a mixed material;

[0045] Finally, at the construction site, add the sol binder prepared according to the ratio to the obtained mixture, mix evenly in a planetary forced mixer for 5-10 minutes, and stir evenly to obtain a rapid-hardening blast furnace hearth repair material that can be used Pumping construction.

Embodiment

[0048] Table 1 lists the raw materials of each embodiment of the rapid-hardening blast furnace hearth repair material of the present invention, its content measured by weight, and main technical performance indicators.

[0049] Table 1 each embodiment and performance

[0050]

[0051]

[0052] The determination of the self-flow value is to pour the uniformly mixed repair material into the truncated cone mold of the cement mortar fluidity tester, lift the round mold to let the repair material flow on the smooth plate until it stops, and then measure the diameter of the repair material is the self-flow value. The mixed restorative material is poured into a standard mold of 40mm×40mm×160mm to show that the hardening standard is not pressed. The fast-hardening blast furnace hearth repair material of the invention has good self-flowing property and quick hardening. According to the provisions of the national standard, the performance indicators such as flexural strength, co...

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Abstract

The invention discloses a rapidly-hardened blast furnace hearth repair material, which comprises a solid material, an admixture and a binding agent, wherein the solid material contains corundum particles and / or fine powder, silicon carbide particles and / or fine powder, a carbon additive and composite superfine powder, and the admixture includes a dispersant and a coagulation accelerator. The invention further discloses a preparation method of the rapidly-hardened blast furnace hearth repair material. The repair material belongs to a downgrade flow type and rapidly-hardened type, can be pumped and poured by clinging to a hearth carbon brick formwork, a pouring body and carbon bricks are closely attached, the construction is rapid and simple and convenient, the repair material is rapidly hardened, the construction period can be effectively shortened by 25%, the structure integrity of the repaired hearth is good, no brick joint exists, and the compactness is high.

Description

technical field [0001] The invention belongs to the technical field of metallurgical refractory materials, and relates to a material for repairing a blast furnace hearth and a preparation method thereof, more specifically, to a rapid-hardening pumped self-flowing repair material for repairing a blast furnace hearth and a preparation method thereof. Background technique [0002] Since the bosh of the furnace adopts copper staves, the weak link of blast furnace longevity has been transferred from the middle and lower parts of the furnace body, the furnace waist, and the bosh to the hearth. According to incomplete statistics, in recent years, there have been more than 50 large-scale blast furnace hearth burn-through accidents in China, and more than 10 blast furnace burn-through accidents have occurred in foreign countries, many of which even occurred in the early stages of furnace service, and some even started furnaces. Less than 1 year. At the same time, there are many blas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3418C04B2235/3826C04B2235/447C04B2235/9676
Inventor 范咏莲高栋唐勋海张雯文张君博徐自伟郑江张正富
Owner CHINA JINGYE ENG TECH CO LTD
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