Environmental-protecting and energy-saving premelting refining slag conditioning agent

A kind of technology of environmental protection, energy saving and slag adjusting agent

Inactive Publication Date: 2017-04-26
QINGDAO SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the difficulty of slag removal in the early stage of refining, and the slag is not easy to foam; it contains CaF 2 , the technical problem of polluting the environment, a refining slagging agent is proposed that can shorten the slagging time of the LF furnace in the early stage and reduce power consumption. At the same time, the slag adjusting agent contains a part of deoxidizer, which can quickly deoxidize and reduce waste.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A domestic steel company uses a 100t converter and LF furnace to produce one of the 40Cr alloy structural steel furnaces. The molten steel weight of this furnace is 103t. The LF furnace enters the station at 1511℃. After entering the station, 300kg of refined slag agent and 900kg of lime (CaO The content is around 86%). Among them, the chemical composition of the refined slag regulator is: Al: 20%-22%, CaO: 35%-37%, Al 2 O 3 :39%-41%, MgO≤2.5%, SiO 2 ≤2.5%, FeO+MnO≤0.7%, S≤0.2%, P≤0.2%, TiO≤0.30%, H 2 O≤0.7%. Preparation process: firstly mix other raw materials except aluminum powder and use flat kiln to pre-melt, the pre-melting temperature is controlled at 1400-1450 ℃, then it is crushed and ground into powder (particle size ≤ 2mm), the aluminum powder and the above powder After mixing uniformly, it is pressed into spherical particles, the particle size is 15-25mm, and the melting point is ≤1300℃.

[0023] 13 minutes after the power was turned on, the slag was completel...

Embodiment 2

[0026] A domestic steel company uses a 100t converter and an LF furnace to produce one of the 42CrMo alloy structural steel furnaces. The molten steel weight of the furnace is 105t, and the LF furnace enters the station at 1507℃. After entering the station, 250kg of refined slag regulator and 950kg of lime (CaO The content is around 86%). Among them, the chemical composition of the refined slagging agent is as follows: Al: 23%-25%, CaO: 32%-34%, Al 2 O 3 :36%-38%, MgO≤2%, SiO 2 ≤2%, FeO+MnO≤0.5%, S≤0.15%, P≤0.15%, TiO≤0.20%, H 2 O≤0.5%. The preparation process is as follows: firstly mix the other raw materials except aluminum powder uniformly and pre-melt them in a flat kiln. The pre-melting temperature is controlled at 1400-1450°C, and then they are crushed and ground into powder (particle size ≤ 2mm), and the aluminum powder is mixed with the above After the powder is mixed uniformly, it is pressed into spherical particles, the particle size is 15-25mm, and the melting point ...

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Abstract

The invention proposes an environmental-protecting and energy-saving premelting refining slag conditioning agent. The environmental-protecting and energy-saving premelting refining slag conditioning agent comprises the following chemical components in percentage by weight: 20-28% of Al, 29-37% of CaO, 33-41% of Al2O3, MgO not more than 2.5%, SiO2 not more than 2.5%, FeO+MnO not more than 0.7%, S not more than 0.2%, P not more than 0.2%, TiO not more than 0.30%, and H2O not more than 0.7%. The refining slag conditioning agent is premolten beforehand, wherein CaO and Al2O3 are combined to generate a lot of low-melting-point 12CaO-7Al2O3; the melting point of the refining slag conditioning agent is lowered; the slag can be quickly molten at the earlier stage of LF furnace refining; the power supply time is shortened; and the energy is saved; and as aluminum is uniformly distributed in the slag conditioning agent, the earlier deoxidation speed is quicker, and the deoxidation effect is excellent. The refining slag conditioning agent is lower in content of TiO, balances the [Ti] element in molten steel, and has a certain capacity of absorbing the [Ti] element in the molten steel.

Description

Technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and particularly relates to a pre-melted refining slagging agent used for LF furnace refining and slagging. Background technique [0002] As we all know, adding a certain amount of aluminum to steel can refine the grain, improve toughness, and also improve the oxidation resistance of steel, improve the electromagnetic ability of steel, and improve the wear resistance and fatigue resistance of nitrided steel. , Improve the corrosion resistance of steel. At the same time, due to the continuous improvement of market demand, aluminum-containing steel grades occupy an increasing share in the steel market, so many manufacturers have begun large-scale production of aluminum-containing steel grades. [0003] In domestic steel companies, LF furnace refining technology has been widely used, and LF furnace slagging is used in the entire LF furnace refining process to desulfurize, deoxidize, bubb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C22C30/00C22C32/00B22F3/02C22C1/10
CPCC21C7/06B22F3/02C22C1/1094C22C30/00C22C32/001
Inventor 张虎杨尚堃肖超张智涛柯加祥郭发军吴志敏王时松刘界鹏
Owner QINGDAO SPECIAL STEEL CO LTD
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