Composite foaming agent for LF furnace under weak deoxidation process and application method of composite foaming agent
A composite foaming agent and process technology, which is applied in the field of composite foaming agent for LF furnace under weak deoxidation process, can solve the problems of low foaming degree of LF furnace refining slag and inability to realize submerged arc operation in the heating process, so as to reduce deoxidation agent consumption, reduce oxygen content, and reduce power consumption
Inactive Publication Date: 2015-10-07
QINHUANGDAO SHOUQIN METAL MATERIAL
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Problems solved by technology
[0004] The purpose of the present invention is to provide a compound foaming agent for LF furnace under weak deoxidation process and its use method, which solves the problem that the foaming degree of LF furnace refining slag is low and the whole process of submerged arc operation cannot be realized in the heating process
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0017] A composite blowing agent for LF furnace under weak deoxidation process and its preparation:
[0018] 1. High-calcium limestone decomposes very quickly at steelmaking temperature, and its reaction speed is mainly affected by C0 2 The control of the diffusion of gas in the particles, in order to slow down the gas generation speed, through field use and exploration, the particle size of high calcium limestone is controlled from 10 to 30mm, which can meet the process needs of LF furnace:
[0019] 2. Before the preparation of the composite foaming agent, the high-calcium limestone was dried at 120°C for 3 hours;
[0020] 3. During the preparation of the composite blowing agent, high-calcium limestone and silicon carbide are mechanically mixed for 4 minutes. After uniform mixing, they are packed in 10kg / bag, which is convenient for manual input on site. The main components of the composite blowing agent and their percentages by weight are: CaCO 3 : 68.7%, SiC: 20.2%, MgCO ...
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The invention provides a composite foaming agent for an LF furnace under a weak deoxidation process and an application method of the composite foaming agent, and belongs to the technical field of external refining. The composite foaming agent mainly comprises, by weight, 63% to 75% of CaCO3, 15% to 26% of SiC, 3% to 5% of MgCO3, 3% to 6% of SiO2, smaller than 2% of C, smaller than 1% of H2O, smaller than 0.02% of S and the balance Fe2O3 and Al2O3. The composite foaming agent has the advantages that products generated by the composite foaming agent can serve as components of refining slag, and the composite foaming agent has the advantages of being low in price and wide in material drawing range. The oxygen content in the slag can be reduced and consumption of other deoxidizing agents can be reduced through the composite foaming agent.
Description
technical field [0001] The invention belongs to the technical field of out-of-furnace refining, and in particular relates to a composite foaming agent for an LF furnace under a weak deoxidation process and a use method thereof. Background technique [0002] At present, most domestic iron and steel enterprises are on the verge of losing money, and reducing production costs and improving product quality have become the top priorities of major iron and steel enterprises. The foam slag refining process of LF furnace is an effective means to improve thermal efficiency, reduce production cost and carry out molten steel refining. However, the molten steel and top slag of the LF furnace have very low oxidation properties, and it is impossible to use their own reactions to provide a large amount of internal gas source required for slag foaming; the bubbles generated by bottom blowing argon during the refining process of the LF furnace are relatively large, which is harmful to The fo...
Claims
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Inventor 杨荣光王志刚王宏宇王国连孙顺义史志强郑展祥杨秋荣
Owner QINHUANGDAO SHOUQIN METAL MATERIAL