Method for realizing direct nickel alloying in stainless steel smelting process by electric arc furnace
A stainless steel and electric arc furnace technology is applied in the field of nickel alloying, which can solve the problems of high production energy consumption and high cost, and achieve the effects of saving added amount, reducing energy consumption and reducing cost.
Inactive Publication Date: 2009-11-18
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0013] The purpose of the present invention is to provide a method for smelting stainless steel in an electric arc furnace to realize nickel direct alloying, which solves the problems of desulfurization, high production energy consumption and high cost in direct nickel alloying
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[0037] Caliguli nickel concentrate and Gansu Jinshan nickel concentrate were respectively selected as the raw materials of the embodiment of the present invention, and the components after desulfurization are shown in Table 1.
[0038] Table 1 Nickel concentrate composition after desulfurization
[0039] Composition / wt%
[0040] After the concentrate source is selected, a total of 6 schemes are adopted, and each scheme is shown in Table 2. The specific implementation process is as figure 1 As shown, the desulfurized nickel concentrate and coke are mixed according to the ratio given in Table 2 to form pellets, and molten iron is added 5 minutes after the start of 100t electric arc furnace smelting. The ratio of the amount of molten iron to the total amount of metal raw materials is shown in Table 2. 10 minutes after the start of smelting, the pellets made of nickel ore and coke were added in batches. Among them, Scheme 1 and Scheme 4 were added in two batches, and ot...
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The invention discloses a method for directly alloying nickel by smelting stainless steel in an electric arc furnace. 15:1~20:1 mixed to make pellets, added in batches during the process of smelting stainless steel in electric arc furnace, the total addition amount is controlled at 100~150kg / t molten steel, and molten iron is added during the smelting process, and the addition amount is the weight of metal raw materials During the oxidation period of electric furnace smelting, the ratio of oxygen and oil injected by the oxygen burner is 4:1-5:1, and the pellets are injected to promote their timely melting and realize oxidative desulfurization; at the end of smelting , Stop oxygen to create a reducing atmosphere, maintain a certain alkalinity of the slag, and realize slag desulfurization. The invention saves a large amount of nickel materials, copper materials, etc., saves equipment investment, reduces costs, and improves production and economic benefits.
Description
technical field [0001] The invention relates to a nickel alloying process for smelting stainless steel, in particular to a method for directly alloying nickel by adding desulfurized nickel concentrate in the stainless steel smelting process. Background technique [0002] The raw material for nickel alloying in stainless steel production is generally electrolytic nickel or nickel-iron. Some manufacturers use nickel oxide block. Because electrolytic nickel, nickel-iron and nickel oxide block are expensive, the use of cheap nickel alloying raw material is important to reduce the cost of stainless steel. measure. [0003] Nickel element has the characteristics of pro-S, O, Fe, and Cu elements, and its minerals are closely combined or associated. There are two main types of nickel ore in nature: sulfide ore and oxide ore, of which sulfide ore accounts for about 13% and oxide ore accounts for about 87%. Nickel sulfide ore is difficult to mine, but it can be enriched into nickel ...
Claims
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IPC IPC(8): C22C33/04C21C7/04C22C38/08
Inventor 陈兆平
Owner BAOSHAN IRON & STEEL CO LTD