Method for reducing, quenching and tempering molten steel slags in reducing atmosphere

A quenching and tempering treatment and steel slag technology, which is applied in the field of reduction and tempering treatment of molten steel slag under reducing atmosphere, can solve the problems of low gelling activity, slow hydration speed, and harm to the volume stability of cement concrete, so as to optimize mineral composition and improve The effect of gelling activity

Inactive Publication Date: 2015-12-02
SHAOGUAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with cement clinker, the total amount of gelling active minerals in steel slag is insufficient, and the formation temperature of silicate minerals is high, the crystallization is dense, and the hydration rate is slow, resulting in a low overall gelling activity; in addition, free CaO and RO is potentially harmful to the volume stability of cement concrete

Method used

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  • Method for reducing, quenching and tempering molten steel slags in reducing atmosphere
  • Method for reducing, quenching and tempering molten steel slags in reducing atmosphere
  • Method for reducing, quenching and tempering molten steel slags in reducing atmosphere

Examples

Experimental program
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Effect test

Embodiment 1

[0020] After the raw materials are crushed and ground, 93% converter steel slag and 7% graphite are selected as reducing component adjustment materials according to the weight percentage, and an appropriate amount of water is added to mix evenly, and slowly pressed by a YAW-300B cement press to make Φ12cm×2cm For the material cake, the maximum pressure is 100kN and maintained for 30s. The pressed cakes are layered and placed in a high-purity MgO ceramic crucible or molybdenum crucible, and placed in a high-temperature electric furnace with a reducing atmosphere to perform a high-temperature simulation reconstruction test. During the test, the high-temperature electric furnace was first vacuum degassed and filled with nitrogen, and then protected in the atmosphere (N 2 ) to 1400°C, and kept at the highest set temperature for 120 minutes, then cooled to room temperature in the furnace under the protection of the atmosphere, and then taken out. For the obtained samples, YB / T140-...

Embodiment 2

[0023] After crushing and grinding the raw materials, select 90% converter steel slag and 10% bituminous coal as reducing component adjustment materials according to the weight percentage, add appropriate amount of water and mix evenly, and slowly press it with a YAW-300B cement press to make Φ12cm×2cm For the material cake, the maximum pressure is 100kN and maintained for 30s. The pressed cakes are layered and placed in a high-purity MgO ceramic crucible or molybdenum crucible, and placed in a high-temperature electric furnace with a reducing atmosphere to perform a high-temperature simulation reconstruction test. During the test, the high-temperature electric furnace was first vacuum degassed and filled with nitrogen, and then protected in the atmosphere (N 2 ) to 1400°C, and kept at the highest set temperature for 120 minutes, then cooled to room temperature in the furnace under the protection of the atmosphere, and then taken out. For the obtained samples, YB / T140-2009 "M...

Embodiment 3

[0026] After the raw materials are crushed and ground, 85% converter steel slag and 15% bituminous coal are selected as the reducing component adjustment materials according to the weight percentage, and an appropriate amount of water is added to mix evenly, and slowly pressed by a YAW-300B cement press to make Φ12cm×2cm For the material cake, the maximum pressure is 100kN and maintained for 30s. The pressed cakes are layered and placed in a high-purity MgO ceramic crucible or molybdenum crucible, and placed in a high-temperature electric furnace with a reducing atmosphere to perform a high-temperature simulation reconstruction test. During the test, the high-temperature electric furnace was first vacuum degassed and filled with nitrogen, and then protected in the atmosphere (N 2 ) to 1400°C, and kept at the highest set temperature for 240 minutes, then cooled to room temperature in the furnace under the protection of the atmosphere, and then taken out. For the obtained sampl...

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Abstract

The invention relates to a method for reducing, quenching and tempering molten steel slags in a reducing atmosphere. The method comprises the following steps: firstly, crushing and grinding steel slags and a reducing component regulating material until the Blaine specific surface area is 200-400m<2>/kg, mixing a proper amount of water into the mixture, uniformly mixing, pressing the mixture into a pat, and baking; then, calcining the pat in a reducing atmosphere high-temperature furnace (the high-temperature electric resistance furnace is vacuumized firstly when a test is performed) at a temperature of 1300-1600 DEG C in a protective atmosphere, and insulating for more than 30 minutes to enable each component to carry out a chemical reaction at a high temperature; and finally, cooling, crushing and grinding the reduced material to prepare modified steel slag powder. According to the method, Fe2O3 and FeO in the steel slags can be reduced to zero-valent iron on the one hand, on the other hand, an iron-aluminum-calcium phase can be decomposed to release CaO, and the zero-valent iron and CaO are beneficial to formation of high cementitious activity silicate minerals, so that mineral composition of the steel slags can be essentially optimized, and the cementitious activity of steel slags is improved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of metallurgical steel slag, and relates to a reduction quenching and tempering treatment method for molten steel slag under a reducing atmosphere. Background technique [0002] Steel slag is the waste slag discharged during the steelmaking process. It belongs to a large amount of industrial solid waste. The discharge of steel slag is generally about 15% to 20% of steel production. Since 2008, my country's annual output of crude steel has exceeded 500 million tons, reaching 823 million tons in 2014, accounting for 49.6% of global crude steel production. In the same year, my country's steel slag discharge exceeded 100 million tons. The disposal and accumulation of a large amount of steel slag not only pollutes the environment but also takes up a large amount of land and causes a waste of resources. The main mineral composition of steel slag is: tricalcium silicate, dicalcium sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B5/00C04B5/06
Inventor 赵三银黎载波赵旭光贺图升陈衍泽
Owner SHAOGUAN COLLEGE
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