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Stokehole modified steel slag and preparation method thereof

A steel slag and modification technology, applied in the field of modified steel slag powder and its preparation, can solve the problems of low activity and poor stability of steel slag.

Active Publication Date: 2021-07-09
张文
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems of low steel slag activity and poor stability in the existing treatment technology, the present invention provides a modified steel slag that is easy to operate, has high gelling activity, and can be used as cement mixture or concrete admixture and its preparation method

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  • Stokehole modified steel slag and preparation method thereof

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preparation example Construction

[0024] The invention provides a method for preparing modified steel slag, comprising the following steps:

[0025] The molten steel slag in the steelmaking furnace is discharged into the slag tank, fully stirred with the modifier prepared in advance, and then quenched to obtain the modified steel slag.

[0026] The components and contents of the modifying agent are respectively 1%-15% of limestone powder, 1%-10% of sandstone powder and 1%-10% of fly ash, and the particle diameters are all less than 0.15mm.

[0027] The steel slag is suitable for the steel slag whose chemical composition has a total content of CaO and MgO less than or equal to 55%. In the example of the present invention preferably include the chemical composition of following mass content: CaO 44-46%, SiO2 30-32%, MgO 3-6%, Al2O31-2%, Fe2O3 O-1%, more preferably: CaO 45.72% , SiO2 31.65%, MgO 5.64%, Al2O3 1.37%, Fe2O3 0.60%.

[0028] In the present invention, in the modified steel slag, the content of the st...

Embodiment 1

[0038] Press limestone powder: sandstone powder: the mass ratio of fly ash=13: 1: 1 prepares modifying agent in advance, the molten state steel slag that just discharges and modifying agent are mixed by the mass ratio of 85: 15 in steel-making workshop, After stirring evenly, let it stand for 20 minutes, then rapidly cool to close to room temperature, grind the obtained modified steel slag into steel slag powder with a specific surface area of ​​400-450m2 / kg, and mix evenly according to the mass ratio of modified steel slag powder: reference cement = 3:7 As the sample to be tested, according to GB / T 51003-2014 "Technical Specifications for the Application of Mineral Admixtures", the performance of the mortar was tested and the activity index of the modified steel slag powder was calculated. The results are shown in Table 2.

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Abstract

The invention provides stokehole modified steel slag and a preparation method thereof. According to the invention, steel slag which is discharged from converter steelmaking and has a temperature of 1400 DEG C or above is discharged to a slag tank, and meanwhile, a modifier (limestone powder, sandstone and fly ash) is mixed with the molten steel slag, wherein the particle size of the modifier is smaller than 0.15 mm, the modifier comprises, in percentage by weight, 1%-15% of the limestone powder, 1%-10% of sandstone powder and 1%-10% of the fly ash, and the total addition amount of the modifier is 5-25%; and the total content of CaO and MgO in the chemical components of the steel slag is less than 55%. The modified steel slag can be used as a cement admixture or a concrete admixture and is applied to cement or concrete. The modified steel slag is high in gelation activity, and the preparation method is simple to operate.

Description

technical field [0001] The invention relates to cement-based materials and the steel industry, in particular to a modified steel slag powder and its preparation method and application. Background technique [0002] Steel slag is the solid waste obtained by cooling the molten material discharged from the steelmaking process with a temperature above 1400°C. As a solid waste in the steel production process, its production volume is 10%-15% of the crude steel output. The amount of steel slag produced is large, but its comprehensive utilization rate is only 20%-30%, and its utilization direction is mainly for recycling inside the steel plant, civil engineering and road engineering. Steel slag contains a considerable amount of scrap steel or magnetic iron oxides, and steel companies will directly recycle it; in civil engineering, tailings can be used as cement mixture or concrete admixture; in road engineering, it is mostly used as road base material . [0003] The low utilizati...

Claims

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Application Information

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IPC IPC(8): C04B7/17C04B7/26
CPCC04B7/17C04B7/26Y02P40/10Y02W30/91
Inventor 张文蔡基伟
Owner 张文
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