Heat treatment method after magnesia carbon brick recovery

A heat treatment method and technology of magnesia-carbon bricks, which are applied in the field of heat treatment of recycled refractory materials after use, can solve the problems of complicated process and increased processing costs of recycled magnesia-carbon bricks, so as to reduce oxidation loss, reduce water vapor treatment process, and reduce treatment costs Effect

Active Publication Date: 2014-02-05
WUGANG REFRACTORY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively complete the reaction of aluminum carbide, but the process is complicated, which increases the cost of recycling magnesia carbon bricks after use.

Method used

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  • Heat treatment method after magnesia carbon brick recovery
  • Heat treatment method after magnesia carbon brick recovery

Examples

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Effect test

Embodiment 1

[0034] A heat treatment method after recovery of magnesia carbon bricks, comprising the following steps:

[0035] 1) Select magnesia carbon bricks, remove miscellaneous bricks, and then remove impurities such as attachments and metamorphic layers on the bricks one by one;

[0036] 2) Sprinkle the magnesia carbon bricks collected in step 1);

[0037] 3) Put the water-sprayed magnesia-carbon brick in a semi-closed device, put it into an electric cellar, and heat it from room temperature to 500 °C at a rate of 10 °C / min for heat preservation and heat treatment for 24 hours; among them, the semi-closed device The surrounding area and the lower end are closed, and the upper end is open. The semi-airtight device includes an inner iron basket 1 hollowed out all around and an outer shell 2 closed all around. m×2.2m×2.2m.

[0038] 4) The magnesia-carbon bricks after heat treatment in step 3) are crushed and iron-removed to obtain magnesia carbon powder. The magnesia carbon powder is ...

Embodiment 2

[0040] A heat treatment method after recovery of magnesia carbon bricks, comprising the following steps:

[0041] 1) Select magnesia carbon bricks, remove miscellaneous bricks, and then remove impurities such as attachments and metamorphic layers on the bricks one by one;

[0042] 2) Sprinkle the magnesia carbon bricks collected in step 1);

[0043] 3) Put the water-sprayed magnesia-carbon bricks in a semi-closed device, put them into an electric cellar, and heat them from room temperature to 650 °C at a rate of 5 °C / min for heat preservation and heat treatment for 12 hours; among them, the semi-closed device The surrounding and the lower end are closed, and the upper end is open. The semi-closed device includes an inner iron basket 1 hollowed out all around and an outer shell 2 closed all around. The length, width and height of the inner iron basket are 1.1m×1.1m×1.1m, and the length, width and height of the outer shell are 1.2m×1.2m×1.2m.

[0044] 4) The magnesia-carbon br...

Embodiment 3

[0046] A heat treatment method after recovery of magnesia carbon bricks, comprising the following steps:

[0047] 1) Select magnesia carbon bricks, remove miscellaneous bricks, and then remove impurities such as attachments and metamorphic layers on the bricks one by one;

[0048] 2) Sprinkle the magnesia carbon bricks collected in step 1);

[0049]3) Put the water-sprayed magnesia-carbon bricks in a semi-closed device, put them into an electric cellar, and heat them from room temperature to 800 °C at a rate of 20 °C / min for heat preservation and heat treatment for 6 hours; among them, the semi-closed device The surrounding and the lower end are closed, and the upper end is open. The semi-closed device includes an inner iron basket 1 hollowed out all around and an outer shell 2 closed all around. The length, width and height of the inner iron basket are 1.5m×1.5m×1.5m, and the length, width and height of the outer shell are 1.7m×1.7m×1.7m.

[0050] 4) The magnesia-carbon bri...

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Abstract

The invention discloses a heat treatment method after magnesia carbon brick recovery. The heat treatment comprises the following steps: firstly, selecting magnesia carbon bricks and removing sundry bricks and impurities attached on the magnesia carbon bricks; secondly, performing watering treatment on the collected magnesia carbon bricks; thirdly, putting the watered magnesia carbon bricks into a semi-sealed device, heating to 500-800 DEG C from the room temperature at a rate of 5-20 DEG C per minute and then carrying out heat-retaining heat treatment, wherein the heat retaining time ranges from 6 to 24 hours; crushing the magnesia carbon bricks after the heat treatment and removing iron to obtain magnesia carbon powder. The heat treatment method is characterized in that the non-dried used recycled magnesia carbon bricks are subjected to semi-sealed type heat treatment, in a semi-sealed iron housing, water in the used recycled magnesia carbon bricks is heated to form water vapor which is not discharged immediately and formed into high-pressure water vapor, the high-pressure water vapor promotes hydration of aluminum carbide in the used recycled magnesia carbon bricks, and therefore, an independent water vapor treatment process is reduced and the treatment cost of the used recycled magnesia carbon bricks is reduced; meanwhile, in the meantime, the oxidization loss of graphite in the used recycled magnesia carbon bricks is reduced and the utilization rate of the used recycled magnesia carbon bricks is increased.

Description

technical field [0001] The invention relates to a heat treatment method for recycled refractory materials, in particular to a heat treatment method for recycled magnesia-carbon bricks. Background technique [0002] Raw materials such as magnesia are in short supply, and the profits of refractory products are shrinking day by day. In order to reduce the production cost of converter magnesia-carbon bricks, many domestic refractory enterprises began to use recycled magnesia-carbon bricks. After processing, they replaced magnesia raw materials and continued to produce magnesia-carbon bricks. [0003] At present, the heat treatment after recovery of domestic magnesia-carbon bricks mainly includes full-burning loss method, half-burning loss method and non-burning method, as follows: [0004] 1) Total combustion loss method: through the characteristics of violent oxidation of graphite above 800 °C, the graphite and phenolic resin binder in the recycled magnesia-carbon bricks are c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 徐志华周勇周辉刘良兵秦常杰田先明雷中兴洪学勤易碧辉
Owner WUGANG REFRACTORY CO LTD
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