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High-temperature treated magnesia carbon brick for RH dip pipe and circulating pipe and preparation method thereof

A technology of high-temperature treatment and magnesia-carbon bricks, which is applied in the field of refractory materials for iron and steel smelting RH vacuum refining furnaces. It can solve the problems of large porosity and general high-temperature strength performance, so as to reduce porosity, strong slag erosion resistance, and improve product quality. The effect of stability

Active Publication Date: 2021-06-04
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

However, for the conditions of use of refractory materials lining RH dipped pipes and circulation pipes, ordinary unfired magnesia-carbon bricks have not been sintered at high temperatures, have general high-temperature strength properties, and large porosity, which cannot meet the requirements of RH refractory materials. Optimize the production process and perform high-temperature firing treatment on ordinary unfired magnesia-carbon bricks, which greatly improves the porosity and high-temperature strength performance

Method used

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  • High-temperature treated magnesia carbon brick for RH dip pipe and circulating pipe and preparation method thereof
  • High-temperature treated magnesia carbon brick for RH dip pipe and circulating pipe and preparation method thereof
  • High-temperature treated magnesia carbon brick for RH dip pipe and circulating pipe and preparation method thereof

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Embodiment 1

[0047] A high-temperature heat-treated magnesia-carbon brick for RH dipping pipes and circulation pipes. The raw material formula is shown in Table 1:

[0048] Table 1: the raw material formula of embodiment 1

[0049]

[0050] The manufacturing method of high-temperature heat-treated magnesia-carbon bricks for RH dipping pipes and circulation pipes is as follows:

[0051] 1) Raw material index detection.

[0052] 2) Ingredients: Accurately prepare each material according to the above weight parts for later use.

[0053] 3) Mixing (600L high-speed mixing machine, model: HNG-600L):

[0054] a. Coarse and medium grain magnesia (3-5mm, 1-3mm, 0-1mm) dry mixed for 2 minutes;

[0055] b. Add 2 / 3 of the total amount of resin (resin temperature 25-35°C) and mix for 3 minutes;

[0056] c. Add graphite and mix at low speed for 3 minutes;

[0057] d. Add the remaining resin and mix for 1 min;

[0058] e. Turn off the kneader and add magnesia with a particle size of ≤0.075mm, ca...

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Abstract

The invention discloses a high-temperature treated magnesia carbon brick for an RH dip pipe and a circulating pipe and a preparation method thereof. The magnesia carbon brick is prepared from the following raw materials in parts by weight: 20-30 parts of magnesia with a particle size of 3-5mm, 10-30 parts of magnesia with a particle size of 1-3mm, 20-30 parts of magnesia with a particle size of less than or equal to 1mm, 10-30 parts of magnesia with a particle size of less than or equal to 0.075 mm, 3-10 parts of crystalline flake graphite, 0.2-2 parts of ultrafine graphite with a particle size of 10-15 [mu]m, 0.2-2 parts of resin powder, 0.2-2 parts of carbon black, 0.1-3 parts of aluminum-silicon alloy powder, 0.1-2 parts of lanthanum oxide, 0.5-3 parts of macrocrystalline magnesia micro powder with a particle size of 10-15 [mu]m, 0.1-1 part of chromium metal and 2.2-3.5 parts of thermosetting phenolic resin. The high-temperature heat-treated magnesia carbon bricks are used as the RH dip pipe and circulating pipe lining refractory material to replace magnesia spinel bricks and magnesia-chrome bricks, the porosity of the RH dip pipe and circulating pipe refractory material is optimized, the high-temperature performance is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of refractory materials for iron and steel smelting RH vacuum refining furnaces, in particular to a high-temperature-treated magnesia-carbon brick for RH dipping pipes and circulation pipes and a preparation method thereof. Background technique [0002] RH vacuum refining furnace is a secondary refining process equipment for producing high-quality steel. The main functions are dehydrogenation, decarburization, deoxidation, desulfurization, adjustment of alloying composition, temperature adjustment, production of ultra-low carbon steel, production of high-clean steel grades, etc. Therefore, RH vacuum refining furnace is widely used in iron and steel enterprises at home and abroad. Dip tube and circulation tube are important components of RH vacuum refining furnace. On the one hand, due to the large temperature difference during operation, the refractory material repeatedly expands and contracts under extremely cold an...

Claims

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Application Information

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IPC IPC(8): C04B35/043C04B35/622C04B41/85C21C7/10
CPCC04B35/043C04B35/622C04B41/85C04B41/5001C21C7/10C04B2235/425C04B2235/424C04B2235/428C04B2235/402C04B2235/3227C04B2235/404C04B2235/5427C04B2235/5436C04B2235/9607C04B2235/9669C04B41/4535C04B41/0072Y02P10/20
Inventor 逄洪运李涛王鹏孙逊李瑞鹏战昱明王琼王忠明
Owner 鞍山市和丰耐火材料有限公司
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