TW570984B - Method for recovering stainless steel slag from EBT steel-discharging-type electric furnace - Google Patents

Abstract

A method for recovering stainless steel slag from an EBT steel-discharging-type electric furnace is used to recover precious metal from an EBT steel-discharging-type electric furnace during production of stainless steel, and comprises: tilting the EBT steel-discharging-type electric furnace so that the slag contained therein is pre-loaded into a steel containing barrel; returning the EBT steel-discharging-type electric furnace to its original status; moving the steel containing barrel containing slag to a position below the outlet of steel liquid of the EBT steel-discharging-type electric furnace; and opening the outlet of steel liquid of the EBT steel-discharging-type electric furnace to drain the stainless steel iron liquid in the EBT steel-discharging-type electric furnace into the steel containing barrel loaded with slag so that the molten stainless steel impinge on the slag in the steel containing barrel to form a mixing function. Thus, precious metal can be recycled at a high efficiency during production of stainless steel by an EBT steel-discharging-type electric furnace, thereby improving the economic efficiency of the process.

Description

570984

[Scope of the invention] The present invention relates to a method for recovering slag metal. In particular, it is particularly applicable to EBT Escentric Bottom electric furnaces.

Tapping), and when it is used to produce stainless steel, it can achieve and greatly improve its precious metal recovery efficiency. EBT tapping type stainless steel slag metal recovery method. [Background of the Invention] According to the traditional steel refining furnace used for refining carbon steel, as shown in Fig. 1, it is a pot-type electric arc furnace 90. The electric arc furnace 90 is provided with an electrode rod 91 through which a three-way current flows. It is used to melt the scrap iron metal, and there are an operation port 9.2 (or outlet) and a steel outlet 93 on both sides. The operation port 92 can be used to input oxygen in the electric melting pass to facilitate electricity. Melting operation; and when the scrap iron metal is melted in the inner electrode of the electric arc furnace, carbon steel 94 and slag 95 floating thereon will be generated. The slag 95 generally includes Fe0, Mn〇, Si〇2, A1Λ, ㈤ And other miscellaneous shellfish, because the refining and recovery of the metal contained in the slag 95 is not cost-effective, and it has an adverse effect on the quality of carbon steel, the slag for carbon steel production is generally removed, and its operation is to first The electric arc furnace 90 is poured to one side of the operation port 92, the slag 95 is poured into a slag bucket 96, and the electric arc furnace 90 is poured to the side of the tap hole 93, so that the carbon steel 94 is poured. Into a Sheng steel bucket 97. And because this type of Asian electric arc furnace 90 is pouring carbon steel molten steel g 4 into the steel drum 9 7%, some slag 9 5 will be poured into the steel drum g 7 together, resulting in The quality of carbon steel refining is unfavorable. Therefore, most of the steelmaking furnaces used in the industry recently use EBT EtCentric Boiler Tapping. As shown in Figure 2, the EBT's electric melting operation is similar. Traditional kettle arc

570984 V. Description of the invention (2) The furnace includes a plate-shaped electric furnace 80. The bottom edge of the electric furnace 80 is provided with a molten steel outlet 81, and the opening and closing system of the molten steel outlet 81 is blocked. Control of the plate 82: After the baffle 82 is drawn out, the carbon steel M in the electric furnace 80 is discharged from the mouth 81 and flows away-the preset steel drum _ eight I carbon steel 83 is effective The upper-floor furnace breaks the production Q and is separated, which greatly improves the refining quality of carbon steel. As the steel industry is becoming more and more competitive, in order to make a profit and live! It belongs to; J sample is a trend, so the production process of carbon steel and stainless steel due to the production process of stainless steel needs to add precious metals such as: ί Oxygen =: 1! Precious metals react with lice in a machine that does not record molten steel to become Cr2 03 and Ni0, so the production of stainless steel _ horse furnace slag 4

Ni calculation) m ", two, the oral collection of precious metals (such as Cr, f) has become an important issue. 1 The yield of precious gold in the slag is an important indicator of the profit of stainless steel production. Yiran, the production of stainless steel When the accompanying slag is ^, it needs to be mixed with the non-recorded molten iron = Dingbei heavy metal recovery, and the power of EBT tapping type electric energy can reach its reduction effect. Furnace slag # ,, said that you can not effectively belong to the valuables in the slag; see the 6 role, and the recovery of the general use of the current J 2 recovery. And if you consider the precious gold pot electric arc furnace (It has the function of changing molten steel and electric furnace to traditional money-making equipment for the industry; 1, the function of pouring and mixing 3), and the EBT steel-type electric furnace will be used to solve the problem of basin production due to the current general income. Difficult problem ', and then developed the precious metal recycling benefits of heavy metals in stationery when scale steel

Page 5 57〇984 V. Description of the invention (3) = law, sincerity is the key direction for industry players to strive for R & D and breakthrough. [Summary of the invention] The main purpose of this month is to provide a one-time, can effectively reduce the steel in the furnace electric furnace in the production of copper does not record EBT tapping-type electric steel-raw 'metal recovery and recovery, and thoroughly the invention Λ Λ in = steel slag metal recovery method i, a kind of ΕΒΤ steel-type electric furnace does not refer to the lack of precious metals, and the recovery of precious metals; ίη the application of electric arc furnace to stainless steel production, and has a positive economic improvement Benefits. ^ Furnace ί: 下 i :::: f The technique feature is to first place the -Steel drum in electricity = f the Sheng steel drum and move it below the electric furnace molten steel outlet into the Sheng Steel 2, the water outlet The stainless steel molten iron is discharged from the molten steel outlet to record the molten steel i, f❿t in the steel ladle, which has slag in advance, so it will not make you angry: I% will have an impact with the slag. Stir and mix, such as ― > Act as 02 + 4〇, * Heart 203 + can be selected as the ancient version of Ding Dong Lr2〇3 + 3C --- > 3c〇 + 2Cr; by this: / can reach the production of stainless steel Accompanied by all the valuables in furnace A such as Cr, Ni, etc .; F ancient to special & " pedestal eight τ berry to belong to * indium cut: Γ :, and completely solve the current ebt recording steel its The difficulty of recovering precious metals in furnace fishing is to further improve the purpose, technical characteristics and other effects of the present invention.

Page 6 570984 V. Description of the invention (4) Understand the detailed description of the "wire matching diagram" as follows: [Implementation Note] = Please refer to Figure 3, the EBT tapping type electric furnace stainless steel recycling method according to the present invention and its applied EBT output The steel-type electric furnace includes a metal supporting device 20 and a linkage device 30. The electric furnace 10 is provided with a pen -11 '. The upper cover device ii is provided with an electric stun rod and related passages; A bottom edge on one side is provided with—and an operating port 13—a baffle plate 12 is provided at the molten steel outlet 12 for opening and closing the molten steel outlet 12. The operating port 13 can be used as a furnace, Check two, and the lower part of the molten steel outlet 12 and the operation port 13 are respectively-the ladle position A and the slag barrel position B, where the ladle position A can place a ladle 40 γ and the After the electric furnace 10 is electrofused, it has stainless steel molten iron 15 and slag 16 floating on the upper layer. The supporting device 20 includes a supporting frame 21 provided at the bottom edge of the electric furnace 10 and teeth of the supporting frame 21. Dynamically linked teeth move structure 22; and the linkage device 30 is connected to the support of the electric furnace 10 source 21. It is used to perform the operation of tilting the electric furnace 10. Following referring to Figs. 4 and 5, when the present invention is applied to the production of stainless steel molten iron 5, the operation method of recovering and reducing precious metals in its slag 16 is as follows: 1 Place the steel bucket 40 on one side of the electric furnace 丨 0 slag outlet 丨 3 (ie, the slag bucket position B), start the linkage device 30, and make the electric furnace 10 tilt according to the support device 20 rotation 2 · Pour the slag 16 into the steel bucket 40, and then return to the original position of the electric furnace 10. 3. Move the steel bucket 40 containing the slag 16 to the electric furnace 1 〇 Molten steel

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5. Description of the invention (5) Below the outlet 12 (that is, the position A of the steel ladle). 4 · Draw out the baffle 14 to open the molten steel outlet 12 and let the non-produced molten steel 15 leak from the molten steel outlet 12 and flow into the steel ladle 40. Since the steel bucket 40 already contains the slag 16 in advance, when the non-scaly hot metal 15 leaks down, it will cause impact mixing with the slag 16 to make the slag 1 The precious metals in 6 can be reduced, such as 2Cr2 03 + 3Si > 3Si02 + 4Cr Cr2 03 + 3C ----- > 3C0 + 2Cr method, the steel drum should be filled with slag for stainless steel Iron production does not record the effects of steel collection, while the recovery of precious metals, which are difficult to slag precious metals, does not record steel to recover the profit. To sum up, k patent applications. For example, if you are familiar with the modification or change of the technical effect of this case, [Schematic symbol description 90 EBT EBT tapping type electric furnace stainless steel slag metal recovery side first put the slag bucket position and hold the slag, then move the steel bucket to the molten steel outlet 1 2 The position of the steel drum below 2 and the operation mode of 15 water stirring and mixing can indeed achieve the high-efficiency reduction of the precious metals such as Cr, ... in the slag. Disadvantages; and the standard f of the operation method of the present invention is even better than the traditional pot-type electric arc furnace for generating precious metals, and has a positive economic efficiency. The present invention has indeed met the requirements of the invention patent, according to the law = 'the above It is only the preferred implementation of the present invention 2 ', and anyone who is right to rely on the spirit of the present invention should be covered by the scope of this application patent. ,

570984 V. Description of the invention (6) 91 Electrode rod 92 Working port 93 Steel outlet 94 Carbon molten steel 95 Slag 96 Slag bucket 97 Steel drum 80 Electric furnace 81 Steel water outlet 82 Baffle 83 Carbon steel 84 Steel drum 85 Slag 10 Electric furnace 20 Support device 30 Linkage device 11 Cover device 12 Molten steel outlet 13 Working port 14 Baffle A Ladle position B Slag barrel position 15 No molten steel 16 Slag

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Page ί 570984 Brief description of the drawings Figure 1 is a schematic diagram of the operation of a traditional pot-type electric arc furnace. Figure 2 is the operation diagram of the conventional EBT tapping electric furnace. Fig. 3 is a schematic diagram of an EBT tapping type electric furnace applied in the present invention. FIG. 4 is a first schematic view of the operation method of the present invention. Figure 5 is the second schematic diagram of the operation method of the present invention. 1 ίϊΐ ϊ

Claims (1)

570984 VI. Scope of patent application, a kind of ΕΒΐ _ _ ΕΒΤ steel-type electric furnace ^ ^ ^ non-recorded steel furnace metal slag metal recovery method, borrowing a collection ', which includes the following steps: chemical conversion of precious metals back to a · The ΕΒτ 屮 细 "A on b. Continue to pour the slag produced in stainless steel and Λ Λ into a steel drum; The stainless steel 锴 k 1 Zn: into a steel drum with slag in 5 Hai, so that The mixing action of simmering water and the furnace inside the steel drum produces an impact type of mixing 2. As described in the item 1 of the scope of the patent application, the metal recovery method of the stainless steel furnace of the EBT tapping type electric furnace, before performing step b, The EBT tapping electric furnace is restored to its original state. 3. According to the method of recovering stainless steel slag metal from an EBT tapping electric furnace described in item i of the scope of the patent application, before performing step b, the steel bucket containing the slag is moved to one of the EBT tapping electric furnaces. Below the molten steel outlet. 4. The method for recovering fishery metals from the stainless steel furnace of the EBT tapping type electric furnace described in item} in the scope of the patent application, wherein before carrying out this step, the molten steel outlet of the EBT tapping type electric furnace is opened.