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Method for preparing high-temperature-resistant steel slag brick by utilizing accelerated carbonization

A high-temperature-resistant steel slag brick technology, which is applied in the field of preparing high-temperature-resistant cement-free steel slag bricks by accelerated carbonization, can solve the problems of low utilization rate of steel slag resources and insufficient high-temperature resistance of brick structures, so as to achieve sustainable development and maintenance. The effect of short time and simple preparation method

Active Publication Date: 2022-05-13
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the existing problems of steel slag and the principle of accelerated carbonization, the present invention adopts a method for preparing high-temperature-resistant steel slag bricks by means of carbonization maintenance, which solves the problems of low resource utilization rate of steel slag and insufficient high-temperature resistance of brick structures

Method used

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  • Method for preparing high-temperature-resistant steel slag brick by utilizing accelerated carbonization
  • Method for preparing high-temperature-resistant steel slag brick by utilizing accelerated carbonization

Examples

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Embodiment 1

[0018] A method for preparing high-temperature-resistant steel slag bricks by accelerated carbonization in this embodiment specifically includes the following steps:

[0019] Step 1, using finely ground converter steel slag powder as the raw material for making bricks, the average particle size of steel slag powder particles is 6 μm;

[0020] Step 2, mixing the steel slag powder with water at a water-to-solid ratio of 0.12, dividing the mixing water into two parts on average, and adding in twice, each stirring time is 30s, to form a mixture of steel slag powder and water;

[0021] Step 3: Weigh an appropriate amount of the mixture in step 2, pour the mixture into the mold and place it under the molding press, pressurize to 15MPa at a constant speed, keep the constant pressure for 20s, and then unload;

[0022] Step 4, immediately put the pressed test block into the temperature-controlled pressure carbonization reactor. The reaction kettle was heated to 70°C in advance and kep...

Embodiment 2

[0025] A method for preparing high-temperature-resistant steel slag bricks by accelerated carbonization in this embodiment specifically includes the following steps:

[0026] Step 1, using finely ground converter steel slag powder as the raw material for making bricks, the average particle size of steel slag powder particles is 17 μm;

[0027] Step 2, mixing the steel slag powder with water at a water-solid ratio of 0.12, adding water twice and stirring for 30 seconds each time to form a mixture of steel slag powder and water;

[0028] Step 3: Weigh an appropriate amount of the mixture in step 2, pour the mixture into the mold and place it under the molding press, pressurize to 12MPa at a constant speed, keep the constant pressure for 20s, and then unload;

[0029] Step 4, immediately put the pressed test block into the temperature-controlled pressure carbonization reactor. The reaction kettle was heated to 50°C in advance and kept at a constant temperature. After the test bl...

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Abstract

The invention discloses a method for preparing a high-temperature-resistant steel slag brick by utilizing accelerated carbonization. The high-temperature-resistant steel slag brick is prepared by mixing 100% steel slag powder and water, during preparation, ground converter steel slag industrial waste is used as a raw material, a blank brick is obtained through compression molding by adopting a low water-solid ratio and high molding pressure, the blank brick is placed in a high-temperature reaction kettle, carbon dioxide gas or industrial flue gas is introduced for accelerated carbonization maintenance, and the high-temperature-resistant steel slag brick is obtained. The steel slag brick is prepared from industrial waste generated by steelmaking, carbon dioxide is used for accelerating curing to achieve the high-temperature-resistant effect, the curing time is short, the strength is high, the high temperature as high as 600 DEG C can be borne, cement clinker is not needed, the cost is low, and the environment-friendly concept of green buildings is met.

Description

technical field [0001] The invention relates to the field of solid waste utilization and the technical field of accelerated carbonization, in particular to a method for preparing high-temperature-resistant cement-free steel slag bricks by utilizing accelerated carbonization. Background technique [0002] Steel slag is difficult to recycle due to low hydration activity and poor volume stability. However, studies have shown that accelerated carbonization can effectively solve these two problems. The accelerated carbonization of steel slag can generate a large amount of calcium carbonate to obtain sufficient strength and durability. In order to facilitate the carbonization process and avoid the risk of volume stability, it is usually used in the form of steel slag bricks. [0003] The brick structure has the disadvantage of poor high temperature resistance. For example, the compressive strength of M10 mortar clay bricks decreases by 35% when the temperature reaches 300°C, whic...

Claims

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Application Information

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IPC IPC(8): C04B30/00C04B40/02C04B111/28
CPCC04B30/00C04B40/0259C04B40/0236C04B2201/50C04B2111/28C04B2111/00017C04B18/142Y02W30/91
Inventor 林忠财仲心卓罗双
Owner HUNAN UNIV
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