Carbon blowing technique for electric furnace smelting
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A technology of electric furnace smelting and carbon spraying, which is applied in the direction of electric furnace, process efficiency improvement, furnace, etc., can solve the problems such as difficult to accurately and effectively control the amount of carbon increase, uneven distribution, poor effect of carbon increase, etc., and shorten the smelting time , Scrap steel recovery rate improvement, the effect of saving electric energy
Inactive Publication Date: 2011-10-12
兰州兴元铸锻有限公司 +1
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Problems solved by technology
Due to the obstruction of the steel slag in the furnace, when the above-mentioned technology is used to increase carbon, most of the carbon powder is sprayed on the steel slag, which cannot be evenly distributed in the molten steel and is wasted, resulting in poor carbon increase effect, large waste, high cost, and difficult to be accurate and effective Control the amount of carbon increase with half the effort
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[0021] The present invention comprises the following steps:
[0022] a. Filling coke powder
[0023] First screen the coke powder: particle size φ≤3mm, moisture content≤3%, sulfur content≤2.5%, and then put 0.8 tons of coke powder after screening into the gunning machine 1. The gunning machine 1 is a purchased part, the model is PB-Y1.2.
[0024] b. Adjust the compressed air pressure
[0025] Adjust the pressure of the gunning machine 1 and the pressure of the self-consumable carbon spray gun 3 to 0.2 MPa to 0.3 MPa;
[0026] c. Open the toner feed valve of the gunning machine;
[0027] d. Insert the self-consumable carbon spray gun 3 through the slag layer 5 into the molten steel in the electric arc furnace molten pool 4;
[0028] e. Electric arc furnace smelting:
[0029] ⑴For the first time, add 12 tons of scrap steel to the electric furnace, send electricity, blow oxygen to melt, and form a molten pool when the ...
[0035] The steps of this embodiment are the same as those of Embodiment 1, the difference is: step e electric arc furnace smelting,
[0036] ⑴ For the first time, add 13 tons of scrap steel to the electric furnace, send electricity and blow oxygen to melt, so that the furnace material is melted to form a molten pool with a carbon content of >0.30%.
[0037] (2) For the second time, add 11 tons of steel scrap to the electric furnace, send electricity and blow oxygen to melt, so that the furnace material is melted to form a molten pool with a carbon content of >0.30%.
[0038] (3) For the third time, add 10.5 tons of steel scrap to the electric furnace, send electricity, blow oxygen to melt, when the temperature of the molten pool rises, all the scrap steel is melted, and when the temperature is >1550°C, take a sample ① (see Table 2), and analyze the furnace through a spectrum analyzer The chemical composition of the mo...
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Abstract
The invention relates to a carbon blowing technique for electric furnace smelting. The method comprises the following steps: a. filling carbon powder: screening carbon powder to obtain carbon powder of which the granularity phi is at most 3mm, the water content is at most 3% and the sulfur content is at most 2.5%, and filling the screened carbon powder in a supplementary blowing machine (1); b. adjusting pressure of compressed air: respectively adjusting the pressure of the supplementary blowing machine (1) and the pressure of the self-consumption carbon blowing gun (3) to 0.2-0.3 MPa; c. opening a carbon powder baiting valve of the supplementary blowing machine; d. inserting the self-consumption carbon blowing gun (3) into molten steel of an electric arc furnace melting bath (4) via a furnace slag layer (5); and e. electric arc furnace smelting by charging three times: when the temperature of the melting bath is increased, melting down scrap steel, starting the supplementary blowing machine to blow the carbon powder into the melting bath three minutes a time, and tapping after the steel meets the chemical composition requirement for steel grade Q235 and achieve the tapping conditions. The invention can save electric energy, increases the steel scrap recovery rate, is simple to operate, and has the advantages of simple equipment and strong feasibility. By adopting the carbon blowing technique, the electricity can be saved by 30 KWH per ton of steel, and the steel scrap recovery rate can be increased by more than 1%, the comprehensive economic benefit per ton of steel is more than 50 Yuan. If the technique is used for electric furnace smelting all over China, 10 billion Yuan can be saved every year.
Description
technical field [0001] The invention relates to a carburization technology in the electric furnace smelting process, and more specifically relates to a carbon spraying technology in the electric furnace smelting process. Background technique [0002] According to the data released by the Ministry of Industry and Information Technology in May 2011, my country's crude steel output has reached 170 million tons in the first quarter of this year, and it is expected to exceed the 700 million tons mark for the whole year. At present, the proportion of electric arc furnace steelmaking in my country is about 20%, that is, 150 million tons of steel is smelted by electric arc furnace. It is predicted that by the end of the "Twelfth Five-Year Plan", this proportion will exceed 30%, that is, more than 200 million tons. The main energy sources for electric arc furnace steelmaking are electrical energy and chemical energy. The electric energy is supplied from the outside, and the chemical...
Claims
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