Smelting process for increasing yield of electric-arc furnace
A technology of yield rate and electric arc furnace, which is applied in the direction of electric furnace, improvement of process efficiency, furnace, etc., can solve problems such as low yield rate of scrap steel, thin foam slag, etc., and achieve the effect of improving yield rate
Active Publication Date: 2014-09-10
TONGYU HEAVY IND
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Problems solved by technology
[0003] The purpose of the present invention is to provide a smelting process to improve the yield of electric arc furnace, so as to solve the problems of thinner foam slag and low scrap yield in the prior art
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Embodiment Construction
[0011] The present invention increases step-by-step slag plugging, slag opening and timely carbon spraying processes, and its specific process steps are as follows:
[0012] A. Slag plugging: add the amount of pig iron in batches, and the amount of carbon is 5%. After the second material is added, when there is a sign that the molten steel in the molten pool overflows from the slag port, start to block the slag port with powdery waste. Under the action of high temperature sintering, a slag shell is formed to block the slag mouth. At this stage, it is not necessary to completely block it, as long as the water-cooled oxygen lance can still be operated at the furnace mouth.
[0013] B. Full blocking of the slag opening: After the third material is added, due to the limited molten pool, more molten steel will flow out of the slag opening in large quantities. At this time, the height of the slag opening should be raised until it is completely blocked.
[0014] C. Slag opening: In t...
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The invention discloses a smelting process for increasing yield of an electric-arc furnace, and belongs to the technical field of smelting. According to the smelting process, procedures such as plugging the cinder notch, opening the cinder notch and spraying carbon in time are added. The smelting process comprises the following specific steps of: A. plugging the cinder notch, namely, adding pig iron in different batches, wherein the total carbon content is 2-10%, and when motel iron in a melting pool overflows from the cinder notch, the cinder notch is plugged by using a powder waste material so as to form a slag crust to plug the cinder notch under the function of high-temperature sintering; B. completely plugging the cinder botch, namely, after the pig iron is added for the third time, as the melting pool is limited in size, more generally a large quantity of molten ion overflows from the cinder notch, then increasing the height of the cinder notch till the cinder botch is completely plugged; C. opening the cinder notch, namely, at the later period of smelting and when the carbon element is completely reacted, opening the cinder notch by using a self-consumed oxygen gun in a combustion mode, blowing the cinder notch and shaking the furnace so as to prevent the slag steel from overflowing; D. spraying carbon, namely, after the cinder notch is combusted, inserting the carbon gun into the furnace port in time to start the carbon spraying operation so as to achieve an appropriate steel tapping carbon content, wherein the carbon spraying quantity is determined according to the residual carbon content of the motel iron; and E. tapping steel, namely, raising the temperature in large current till the steel is smelted.
Description
technical field [0001] The invention belongs to the technical field of smelting. Background technique [0002] The characteristic of electric arc furnace smelting is that it can theoretically use unlimited cold materials such as scrap steel. It can use all scrap steel smelting without hot charging of molten iron. If the equipment conditions permit, it can use scrap steel preheating technology. At present, electric arc furnaces in some small steel mills use all-scrap steel smelting without scrap preheating technology. Most of the electric arc furnace smelting methods use foam slag smelting method, but when the slag opening is not blocked, the foam slag layer is thin and the slag The degree of steel emulsification is smaller than this method, the reaction speed is slow under the same equipment capacity, the carbon content in the smelting process is low, the scrap yield is not high, and the production potential is not maximized. Contents of the invention [0003] The purpose...
Claims
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IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 司兴奎刘殿山倪洪运王成业
Owner TONGYU HEAVY IND