A control method for realizing reduction and upgrading of steel slag, water-quenched slag and its application

A control method and technology of water quenching slag, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of high energy consumption, long reaction period, and difficulty in ensuring the adequacy of the reaction, and achieve high efficiency The effect of comprehensive utilization

Active Publication Date: 2022-04-26
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the molten state, the reduced iron is directly combined with silicon to form a layered phase between ferrosilicon and slag. At this time, the interface reaction between liquid and liquid mainly occurs, and the adequacy of the reaction is difficult to be guaranteed. There are long reaction cycles and energy consumption. major issues

Method used

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  • A control method for realizing reduction and upgrading of steel slag, water-quenched slag and its application
  • A control method for realizing reduction and upgrading of steel slag, water-quenched slag and its application
  • A control method for realizing reduction and upgrading of steel slag, water-quenched slag and its application

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Experimental program
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Effect test

Embodiment 1

[0039] The implementation process of the embodiment includes:

[0040] Separately crush and grind steel slag, siliceous reducing agent and auxiliary agent until the Blaine specific surface area is 150-180m 2 / kg, add silicon powder with 8% steel slag quality as siliceous reducing agent, 1% bituminous coal as auxiliary agent, add appropriate amount of water and mix evenly, press into a cylindrical block with a diameter of 10cm and a height of 10cm, and dry it. Place the dried material in a high-purity MgO ceramic crucible, place the crucible in a vacuum high-temperature furnace for calcination, and control the calcination temperature system, respectively at 1050°C±50°C, 1200°C±50°C, 1300°C±50°C ℃ and 1525℃±25℃ for 30 minutes each in four stages. After the material is melted in the fourth heat preservation stage, the modifier calcium oxide is added to adjust the basicity R to be 1.0 (R=CaO / SiO 2 mass ratio).

[0041]The reduced material was water-quenched to obtain reduced fe...

Embodiment 2

[0043] The implementation process of the embodiment includes:

[0044] Crush and grind the steel slag, siliceous reducing agent and auxiliary agent separately until the Blaine specific surface area is 200-230m 2 / kg, add silicon carbide with 15% steel slag mass as silicon reducing agent, 1.5% semi-coke as auxiliary agent, add appropriate amount of water and mix evenly, press into a cylindrical block with a diameter of 10cm and a height of 10cm, and dry . Place the dried material in a molybdenum crucible, place the crucible in a vacuum high-temperature furnace for calcination, and control the calcination temperature system, respectively at 1050°C±50°C, 1200°C±50°C, 1300°C±50°C and 1525°C ℃ ± 25 ℃ four stages of insulation for 30min each. After the material is melted in the fourth heat preservation stage, the modifying agent calcium oxide is added to adjust the basicity R to 1.1.

[0045] The reduced material was water-quenched to obtain reduced ferrosilicon alloy and water-q...

Embodiment 3

[0047] The implementation process of the embodiment includes:

[0048] Separately crush and grind steel slag, siliceous reducing agent and auxiliary agent until the Blaine specific surface area is 250-280m 2 / kg, add ferrosilicon with steel slag mass 30% as siliceous reducing agent, 2% mixture of bituminous coal and semi-coke (mass percentage of bituminous coal and semi-coke is 1:1) as auxiliary agent, add appropriate amount of water to mix evenly, and press into A cylindrical block with a diameter of 10 cm and a height of 10 cm is dried. Place the dried material in a high-purity MgO ceramic crucible, place the crucible in a vacuum high-temperature furnace for calcination, and control the calcination temperature system, respectively at 1050°C±50°C, 1200°C±50°C, 1300°C±50°C ℃ and 1525℃±25℃ for 30 minutes each in four stages. After the material is melted in the fourth heat preservation stage, the modifying agent silicon dioxide is added to adjust the basicity to 1.25.

[0049...

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Abstract

The invention discloses a control method for realizing the reduction and modification of steel slag, water-quenched slag and its application. The process of the control method includes: mixing steel slag, siliceous reducing agent and auxiliary agent powder into water, mixing them evenly, and pressing them into blocks , drying; the siliceous reducing agent accounts for 8%-35% of the steel slag mass, and the auxiliary agent accounts for 1%-2.3% of the steel slag mass; the dried block is calcined in a vacuum environment, and the calcining temperature system is controlled. Four stages of 1050°C±50°C, 1200°C±50°C, 1300°C±50°C and 1525°C±25°C; in the fourth stage of calcination and heat preservation stage, after the material is melted, the alkalinity is adjusted to 1.0-1.4; water quenching, A reduced ferrosilicon alloy and water-quenched slag are obtained. The invention adopts a temperature system combining direct reduction and melting modification, fully dissociates iron-containing compounds in steel slag and completes modification through stepwise reduction, and realizes high-efficiency comprehensive utilization of steel slag.

Description

technical field [0001] The invention relates to the technical field of steel slag comprehensive treatment, in particular to a control method for realizing reduction and upgrading of steel slag, water-quenched slag and its application. Background technique [0002] Steel slag is a typical solid waste in the production process of electric furnace or converter steelmaking, and its main components are calcium oxide, silicon dioxide, iron oxide and alumina. With the increase in steel production, the discharge of steel slag is also on the rise. A large amount of steel slag is discarded and piled up, which not only causes waste of resources but also pollutes the environment. Steel slag contains about 20% to 30% iron components, which have recovery value, and the silicate minerals in steel slag have certain potential gelling activity, which has a potential basis for development as cement mixture. However, iron minerals are mainly RO phase (solid solution of FeO, MgO and MnO), which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/04C04B18/14
CPCC04B20/04C04B18/142Y02W30/91
Inventor 李小明张馨艺臧旭媛郑建潞邢相栋吴育庆王伟安阮锦榜庞焯刚
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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