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High-temperature liquid-state steel slag granulating device and process

A technology of liquid steel slag and steel slag, which is applied in the field of high-temperature liquid steel slag granulation device and granulation process, can solve the problems of narrow application range, poor uniformity, poor stability of steel slag balls, etc., and achieve high efficiency, sufficient granulation, and steel slag Fully granulated effect

Inactive Publication Date: 2013-07-17
HENAN UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to solve the problems of poor stability, poor uniformity and narrow application range of steel slag balls, the present invention provides a high-temperature liquid steel slag granulation device and granulation process, which effectively expands the application range of steel slag balls and eliminates the internal Unstable phase, improve the quality of steel slag ball

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  • High-temperature liquid-state steel slag granulating device and process

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Embodiment 2

[0029] The weight of liquid electric furnace steel slag is 500kg, the temperature is 1600°C, and its chemical composition (weight percentage) is as follows: CaO: 29.1%, MgO: 9.7%, SiO 2 :16.5%,Al 2 o 3 : 3.5%, FeO: 20.9%, MnO: 4.5%, free calcium oxide 6.3%, free magnesium oxide: 8.9%, other 0.6%. The steel slag flow rate is 0.1t / min, the gas pressure in the air cavity is 0.05MPa, and the air volume is 5m 3 / min; the angle between the spray panel and the horizontal direction is 55°; the angle between the second layer of nozzles and the normal line of the panel is 5°, after the steel slag is granulated according to the above process, the FeO phase in the steel slag disappears, and the content of free CaO and MgO is low. to 0.1%, while 2CaO·Fe 2 o 3 The phase increases significantly, the steel slag is granulated into balls, with a spinel structure, and the structure is stable.

[0030] The comparison of the appearance and composition of the steel slag processed by this meth...

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Abstract

The invention relates to a high-temperature liquid-state steel slag granulating device and process. The high-temperature liquid-state steel slag granulating device comprises a liquid-state steel slag pouring system and a steel slag granulating system, wherein an atomizing nozzle of a cooling water spraying device in the steel slag granulating system is connected with an air cavity of an air spraying device, the air spraying device is provided with a spraying panel with an adjustable angle, the angle of the spraying panel, and air pressure in the air cavity and air quantity of an air nozzle are adjusted so that liquid-state steel slag is blown to do parabolic flight, and the liquid-state steel slag fully reacts with air and moisture in the flying process to form granulated steel slag spheres. According to the invention, a structure with upper and lower layers of nozzles is adopted, thus the steel slag is atomized twice in the flying process, atomization efficiency of the steel slag is greatly improved; explosion effect generated by cooling water and high-temperature steel slag is utilized to ensure that the steel slag is granulated more fully; meanwhile, dissociative calcium oxide and magnesium oxide can be digested, and a glass-state layer of a spinel structure is formed on the surface of the steel slag, thus tissue structure is smaller and more stable.

Description

technical field [0001] The invention relates to the technical field of recycling waste steel slag in the iron and steel industry, in particular to a high-temperature liquid steel slag granulation device and a granulation process. Background technique [0002] With the development of the steel industry, the discharge of steel slag is increasing day by day. Due to my country's backward recycling technology of steel slag, only a small part (less than 10%) is used for steel slag cement and road construction, and most of it is used for landfill. According to incomplete statistics, in 2011, the cumulative accumulation of waste steel slag in my country was not less than 350 million tons, which not only occupied a large amount of land resources, but also seriously polluted the environment. Therefore, the recycling of steel slag has become a technical problem to be solved urgently in the iron and steel industry. At present, my country's steel slag treatment processes mainly include ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06C21B3/08
CPCC21B2400/024C21B2400/026C21B2400/062Y02W30/50
Inventor 闫焉服闫红星王智伟李华侨庞团结李坤遂宋建波
Owner HENAN UNIV OF SCI & TECH
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