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Modified AOD (Argon Oxygen Decarburization) slag as well as preparation method and application thereof and building material

A construction material and modification technology, applied in the field of metallurgy, can solve the problems of poor product safety and high leaching concentration of Cr element, and achieve the effects of low production cost, low leaching concentration and good application prospects

Active Publication Date: 2022-05-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the leaching concentration of Cr element in the above-mentioned stainless steel refining slag is high (≥0.2mg / L), and the product safety is poor

Method used

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  • Modified AOD (Argon Oxygen Decarburization) slag as well as preparation method and application thereof and building material
  • Modified AOD (Argon Oxygen Decarburization) slag as well as preparation method and application thereof and building material
  • Modified AOD (Argon Oxygen Decarburization) slag as well as preparation method and application thereof and building material

Examples

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preparation example Construction

[0025] The invention provides a kind of preparation method of modified AOD slag, comprises the following steps:

[0026] Melt and mix AOD slag and fly ash to obtain molten slag;

[0027] The molten slag is quenched to obtain modified AOD slag.

[0028] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0029] The invention melts and mixes AOD slag and fly ash to obtain molten slag.

[0030] The present invention has no special limitation on the source of the AOD slag, and the AOD slag well-known to those skilled in the art can be used; Refining slag produced by refining. In the present invention, the water content of the AOD slag is preferably ≤5wt%, more preferably 2wt%. In the present invention, the chemical composition of the AOD slag preferably includes CaO 55-60wt%, more preferably 56-59wt%, further preferably 57-58wt%; SiO 2 25~30wt%, more preferably 26~29wt%...

Embodiment 1

[0041] (1) Modified AOD slag

[0042] Mix 65g of AOD slag and 35g of fly ash evenly and place them in a corundum crucible, place the corundum crucible in a vertical resistance furnace, raise the temperature to 1550°C at a rate of 5°C / min, heat-preserve, melt and mix for 60min, and obtain a molten scum.

[0043] The corundum crucible was removed from the vertical resistance furnace, high-pressure water quenching was carried out at a cooling rate of 400° C. / min, and the obtained granulated slag was ground to obtain modified AOD slag with a particle size of 0.08 mm (specific surface area of ​​542 m 2 / kg), wherein, the water pressure of high pressure water quenching is 0.6MPa.

[0044] (2) Building materials

[0045] The modified AOD slag and Portland cement clinker are mixed at a mass ratio of 2:8 to obtain building materials.

Embodiment 2

[0047] The modified AOD slag and building materials were prepared according to the method of Example 1, the difference from Example 1 was that the amount of AOD slag was 70g, and the amount of fly ash was 30g.

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Abstract

The invention provides modified AOD (Argon Oxygen Decarburization) slag as well as a preparation method and application thereof and a building material, and relates to the technical field of metallurgical technologies. According to the method, the molten AOD slag and the fly ash are mixed and then subjected to cold quenching, a large number of glass phases are generated in the modified AOD slag, the hydration activity, the chromium curing capacity and the stability are excellent, the leaching concentration of Cr in the obtained modified AOD slag is smaller than or equal to 0.042 mg / L and is far lower than the Cr leaching standard value 1.5 mg / L in detoxified chromium slag specified by HJ / T 301-2007, the leaching concentration of the Cr element in the modified AOD slag is low, safety is high, and the method is suitable for industrial production. Good application prospects are realized in building materials. Moreover, the preparation method provided by the invention is wide in raw material source, low in price, low in production cost, high in safety and suitable for industrial production, the resource utilization rate of the AOD slag and the fly ash is increased, and the pollution of solid waste to the environment is reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a modified AOD slag, its preparation method and application, and building materials. Background technique [0002] AOD slag is the remaining refining slag produced by the argon oxygen decarburization refining furnace in the stainless steel production process. It is difficult to use because of its poor activity and certain leaching of toxic Cr elements. The main components of AOD slag are CaO 55-60wt%, SiO 2 25~30wt%, Cr 2 o 3 1~3wt%, MgO 2~5wt%. Prior art CN109180030A discloses a building cementitious material and building materials. The building cementitious material is made by mixing and grinding stainless steel refining slag and industrial waste slag, wherein the stainless steel refining steel slag is AOD furnace steel slag for smelting stainless steel, and the industrial waste slag is Iron and steel mill waste and / or steel slag tailings; building materials produced by ...

Claims

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Application Information

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IPC IPC(8): C04B5/06C04B28/04C04B18/14
CPCC04B5/06C04B28/04C04B18/142Y02W30/91
Inventor 张延玲武绍文赵峥张帅余阚高朝辉许香帅
Owner UNIV OF SCI & TECH BEIJING
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