201124539 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種鋼水精鍊方法，且特別是有關於 一種盛鋼桶鋼水精鍊脫硫方法。 【先前技術】 盛鋼桶精鍊是電爐鍊鋼過程必備的製程之一，其中還 原造渣是精鍊製程中不可或缺的一環。還原渣程序在精鍊 • 製程中除扮演降低鋼水中的硫含量與調整鋼液成份的角色 外，還能保護熔鋼不被高溫氧化。 廢鋼（steel scrap)經電爐熔解成鋼水並脫構處理後， 將鋼水倒入盛鋼桶内，以電弧加熱方式，使盛鋼桶鋼水加 溫至1620°C，而後開始進行脫硫精煉製程，所使用的脫硫 劑以氧化鈣（CaO)為主。然而目前的電爐鋼廠均將鍊鋼 產生的爐潰作一次性使用，導致大量並未反應完全的精鍊 渣在還有很強的脫硫能力時就被拋棄，不僅浪費造渣成 • 本，更造成環境的負擔。 目前已有增加精鍊渣使用次數的技術。利用將高爐 (blast furnace ) 鐵水之脫硫潰經過多道處理步驟，包括 機械粉碎、撒水冷卻、金屬磁選、補充石灰源及碳源等步 驟，製成再生脫硫渣重複利用。然而，由於製程繁複使得 再生成本居高不下，且尚須委託相關處理業者進行處理， 就經濟效益來說，並不符合電爐鍊鋼業的需求。 此外，上述技術尚須配合改良的輸送流程，並牵涉到 硬體設備及精鍊爐體結構上的重新設計，需要大幅改變目 201124539 前鍊鋼業的排潰習慣’因此難以實際顧於產業，尤其難 以應用在電爐廠。 【發明内容】 因此’本發明之一態樣是在提供一種盛鋼桶鋼水精鍊 脫硫方法，包括將盛鋼桶鋼水精鍊後之脫硫渣，直接加入 另一鋼水中進行脫硫反應。 本發明之另一態樣是在提供一種盛鋼桶鋼水精鍊脫硫 #劑’為於盛鋼桶鋼水精鍊中進行至少一次脫硫反應所產出 之脫硫渣，可用於硫含量介於約0 06_0 〇3 wt %之間的鋼水 脫硫。 根據上述，本發明實施方式具有下列技術優點： 本發明實施方式之盛鋼桶鋼水精鍊脫硫方法，利用進 t過一次脫硫反應所產出之脫硫渣具有較低熔點 ，於接觸 局溫鋼水時會自然散開、氧_可再與鋼水接觸脫硫的特 ^接進行脫硫渣再利用，不需冷卻、破碎等前處理步 ’、不:添加其他原料，真正達到環保與節能的目的。 進行施方式’將脫硫渣與鋼水分離取出後，不 保拷赫古μ卩直接將脫硫渣運用於另一鋼水之脫硫，可 升溫^脫硫起始溫度，以縮短精鍊升溫的時間並節省 2主冷此外，脫硫渣於盛鋼桶中因熔點低，故在高溫 可古s机動狀態，較顆粒狀氧化鈣具有更好的覆蓋性， ^有效1絕外界氧氣，促進氧化妈與鋼水中的硫反應完全。 理，^土明之實施方式，特別避免對脫硫渣進行破碎處 八有防止氣化詞與外界水氣反應產生氫氧化#5( CaOH) 201124539 維持氧化鈣的反應性’達到完整的脫硫效果。 本發明實施方式之盛_鋼水精鍊脫硫方法， 適回收之電爐鍊鋼業使用，可重複利用盛鋼桶鋼 之脫硫渣，不經過任何前處理，直接加入鋼水 I70、仃脫硫，並達到結構鋼等級所需的脫硫標準。 【實施方式】 本發明貝施方式之盛鋼桶鋼水精鍊脫硫方法，包括將 鲁盛鋼桶鋼水精鍊產出之脫硫渣，直接加人另-鋼水中進行 脫硫反應’可用於原始含硫量介於約〇 〇6_〇 〇3 wt %之間的 鋼水（廢鋼）脫硫。 凊參照第1圖，其繪示依照本發明實施方式的一種盛 鋼桶鋼水精鍊脫硫的方法流程圖，包含下列步驟： 步驟110’將氧化鈣粒料加入第一爐次之鋼水（以下 簡稱第一鋼水）中形成一次脫硫渣。依照本實施方式之一 實施例’氧化鈣粒料添加量為第一鋼水量之丨u 8wt%。 秦鋼水的溫度係控制於1620-1630 °c之間，造渣之時間為約 30-50分鐘’第一鋼水中所含之硫可降至〇 〇3 wt %以下。 表1為氧化鈣粒料經過一次脫硫處理後，形成的一次 脫硫渣成份。 表1 一次脫硫渔成份 成份 CaO Si02 AI2O3 Fe2〇3 MgO MnO P2O5 CaS Total 含量 (wt.%) 63.99 18.45 10.36 3.086 1.583 2.246 0.021 0476 100.11 201124539 由表1可看出以氧化約粒料為 中捭加了眉太新轾的盼抹為,/為原料產生之一次脫硫渣 中曰力了原本新鮮的脫硫劑（氧㈣ 質，例如氧化石夕、氧化銘、氧化 所沒有的雜 7 4 Λ上、Α 乳化鐵等，但氧化鈣（CaO) 仍為主要成伤。3有雜質的一次脫硫渣，i熔點會下降， 約介於1400-150(TC之間（氧化鈣的熔點為2572。〇 )。 由於一次脫硫渣的熔點（1400-1500。(：）低於鋼水脫硫 溫度（1620-1630 °C )，可於第二爐次的高溫鋼水中熔融分 散’而暴露出未反應的氧化鈣部份以進行脫硫反應。201124539 VI. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a refining method for molten steel, and in particular to a method for refining desulfurization of steel ladle. [Prior Art] Shenggang refining is one of the necessary processes for the electric furnace chain steel process, and the original slag is an indispensable part of the refining process. In the refining process, in addition to reducing the sulfur content in the molten steel and adjusting the composition of the molten steel, the reducing slag program also protects the molten steel from high temperature oxidation. After the steel scrap is melted into molten steel by electric furnace and deconstructed, the molten steel is poured into a steel ladle, and the molten steel is heated to 1620 ° C by arc heating, and then desulfurization is started. In the refining process, the desulfurizing agent used is mainly calcium oxide (CaO). However, the current electric furnace steel mills use the furnace produced by the chain steel for one-time use, resulting in a large number of unreacted refining slags being discarded when there is still a strong desulfurization capacity, not only wasting slag into It also creates a burden on the environment. There are currently techniques for increasing the number of times the refining slag is used. The re-desulfurization slag is reused by a plurality of treatment steps including desulfurization of molten iron in a blast furnace, including mechanical pulverization, water-spraying, metal magnetic separation, supplementation of lime source and carbon source. However, due to the complicated process, the cost of recycling is high, and it is still necessary to entrust the relevant processing industry to deal with it. In terms of economic benefits, it does not meet the demand of the electric furnace chain steel industry. In addition, the above technology still needs to cooperate with the improved conveying process, and involves the redesign of the hardware equipment and the structure of the refining furnace. It is necessary to drastically change the habit of the pre-chain steel industry in 201124539, so it is difficult to actually take care of the industry, especially Difficult to apply in electric furnace plants. SUMMARY OF THE INVENTION Therefore, one aspect of the present invention provides a method for refining desulfurization of molten steel in steel drums, which comprises directly adding desulfurization slag after refining molten steel in steel drums to another molten steel for desulfurization reaction. . Another aspect of the present invention provides a desulfurization slag produced by at least one desulfurization reaction in a steel refining of a steel drum, which is used for the sulfur content. The molten steel is desulfurized between about 0 06_0 〇 3 wt %. According to the above, the embodiments of the present invention have the following technical advantages: The steel refining and desulfurization method for the steel drum of the embodiment of the present invention uses the desulfurization slag produced by the desulfurization reaction once to have a lower melting point at the contact bureau. When warm steel water will naturally disperse, oxygen _ can be contacted with molten steel to desulfurization, and then use desulfurization slag for reuse, no need for cooling, crushing and other pre-treatment steps', no: adding other raw materials, truly achieving environmental protection and The purpose of energy saving. After the desulfurization slag is separated from the molten steel, the desulfurization slag is directly applied to the desulfurization of another molten steel, and the initial temperature of desulfurization can be raised to shorten the temperature of refining. The time and save 2 main cold In addition, the desulfurization slag in the steel drum because of the low melting point, so the high temperature can be s mobile state, better coverage than granular calcium oxide, ^ effective 1 external oxygen, promote Oxidation mother reacts completely with sulfur in molten steel. Rational, ^Tuming's implementation, especially to avoid the crushing of the desulfurization slag, to prevent the gasification word from reacting with the external water and gas to produce hydroxide #5(CaOH) 201124539 Maintaining the reactivity of calcium oxide' to achieve complete desulfurization effect . The steel-refining desulfurization method of the embodiment of the present invention is used in the electric furnace chain steel industry suitable for recycling, and the desulfurization slag of the steel drum steel can be reused, and the molten steel I70 and the desulfurization are directly added without any pretreatment. And meet the desulfurization standards required for structural steel grades. [Embodiment] The method for refining desulfurization of molten steel in the steel drum of the present invention includes the desulfurization slag produced by refining steel from the steel drum of Lusheng steel, and directly adding desulfurization reaction in another steel water. The molten steel (scraper) with a raw sulfur content between about 〇〇6_〇〇3 wt% is desulfurized. Referring to FIG. 1 , a flow chart of a method for refining desulfurization of molten steel in steel drum according to an embodiment of the present invention includes the following steps: Step 110 ′ adding calcium oxide pellets to the molten steel of the first heat ( Hereinafter, the primary desulfurization slag is formed in the first molten steel. According to one embodiment of the present embodiment, the amount of calcium oxide pellets added is 丨u 8 wt% of the amount of the first molten steel. The temperature of Qingang water is controlled between 1620-1630 °c, and the slagging time is about 30-50 minutes. The sulfur contained in the first molten steel can be reduced to less than wt3 wt%. Table 1 shows the composition of the primary desulfurization slag formed by the calcium oxide pellets after one desulfurization treatment. Table 1 Primary desulfurization and fishing ingredients CaO Si02 AI2O3 Fe2〇3 MgO MnO P2O5 CaS Total content (wt.%) 63.99 18.45 10.36 3.086 1.583 2.246 0.021 0476 100.11 201124539 It can be seen from Table 1 that the oxidation of about pellets is medium and The eyebrows are too new and look forward to, / for the primary desulfurization slag produced by the raw materials, the original fresh desulfurizer (oxygen (4), such as oxidized stone, oxidation, and oxidation, 7 4 Λ Upper, Α emulsified iron, etc., but calcium oxide (CaO) is still the main injury. 3 Primary desulfurization slag with impurities, i melting point will drop, about 1400-150 (TC) (the melting point of calcium oxide is 2572 〇). Due to the melting point of the primary desulfurization slag (1400-1500. (:) is lower than the molten steel desulfurization temperature (1620-1630 °C), it can be melt-dispersed in the second heat of molten steel) and exposed. The unreacted calcium oxide portion is subjected to a desulfurization reaction.
步驟120，出鋼後將一次脫硫渣取出，直接加入第二 爐次的鋼水（以下簡稱第二鋼水）中，即可進行第二鋼水 的脫硫。脫硫之反應式如下： [FeS] + CaO = (FeO) + CaS 。 本文所述之「直接加入」，係為盛鋼桶鋼水精鍊產出之 脫硫渣取出後，在加入另一鋼水之前，只進行必要之運送 及暫時堆放，即加入另一鋼水中，不經任何刻意處理，包 括破碎、沖水、降溫等處理。 依照本實施方式之一實施例，鋼水的溫度係控制於 1620-1630 °C之間，脫硫反應之時間為約30-50分鐘，以利 脫硫反應進行，並避免溫度過高導致爐襯耗損。 請參照第2圖，為一次脫硫渣的熱差分析圖 (Differential Thermal Analysis)。第 2 圖中顯示在 1432°C 有明顯的吸熱峰，表示一次脫硫渣的熔點接近1432°C。因 為脫硫溫度設定在約1620°C ’因此’ 一次脫硫渣於高溫鋼 水中很容易熔融分散而覆蓋於鋼水表面’暴露出未反應的 氧化鈣部份以進行脫硫反應 201124539 本發明之實施例將一次脫硫渣直接加入鋼水中，不在 空氣中破壞渣之結構，使渣中之氧化鈣到鋼水中才暴露出 來，可維持一次脫硫渣内部氧化約的反應性，促進脫硫反 應，因此可達到同一批氧化鈣應用於至少二個爐次的效 果，不需再額外補充脫硫劑。此外，由於脫硫渣的熔點低， 因此在高溫鋼水中呈現半流動狀態，相較於顆粒氧化鈣可 具有較佳的覆蓋性，能隔絕外界氧氣。 依照本實施方式之一實施例，更可藉由控制第二鋼水 中之游離氧含量，促進脫硫效果。游離氧含量控制在約20 ® ppm以下，可達較好的脫硫效果。控制氧含量的方法可包 括脫硫反應進行時，於第二鋼水中加入一脫氧劑，例如純 在呂或純鎮。 實施例： 將市售之氧化辦進行細化處理以增加表面積，形成氧 化鈣粒料，並存放於真空或密閉環境備用，避免氧化鈣粒 料受潮形成氫氧化鈣而影響脫硫能力。 ® 使用之廢鋼的原始含硫量為0.054 wt.%，其他成份包 含碳 0.015 wt.%、石夕 0.021wt.%、猛 0.087 wt.%、磷 0.018 wt.% ;其餘包括鉻、鎳、鉬、銅、鋅、铭、鈦、約等，其 含量均少於0.01 wt.%。 將70公斤之上述廢鋼置於高週波爐内準備熔鍊，控制 高週波爐溫度緩慢升溫，由1525t、1602°C、1615°C直至 達到1631°C，以除去鋼材中生成之廢渣。此外，可適量添 加矽鐵和錳鐵調整鋼水成份。 201124539 將1120克氧化鈣粒料(添加量約為鋼水量之 及50純銘添加於炫融之鋼水中，以1622 分鐘進行脫硫反應並造渣。 0 〇月，.、、、第3圖，為本實施例之第一鋼水脫硫反應進 時之炫融鋼與脫硫渣的外觀則。第3目（a)為了 脫硫反應時，氧化·料覆蓋於鋼水上的照片；第3圖（^ 為出鋼水時將鋼水倒人砂模賴片；第3圖（c)為在） :水：=—次脫硫反應所產出的-次脫硫渣外觀昭 片，-=脫硫渔從鋼水中取出時呈現半流動狀，冷卻後^ 的顆粒較細的氧化1恤料結成較大塊狀的 r=:t為放大圖)，由於吸附了雜質及沾附部份鋼 :的重收的重量會略大於原本加入的氧化約粒 枓的重里’在本實施例中，回收的脫硫潰量為1280克。In step 120, after the tapping, the primary desulfurization slag is taken out and directly added to the molten steel of the second heat (hereinafter referred to as the second molten steel), and the second molten steel is desulfurized. The reaction formula for desulfurization is as follows: [FeS] + CaO = (FeO) + CaS. The "direct addition" described in this paper is to take out the desulfurization slag produced by the steel refining of Shengsteel, and then carry out the necessary transportation and temporary stacking before adding another molten steel, that is, adding another molten steel. Without any deliberate treatment, including crushing, flushing, cooling and other treatments. According to an embodiment of the present embodiment, the temperature of the molten steel is controlled between 1620-1630 ° C, and the time of the desulfurization reaction is about 30-50 minutes to facilitate the desulfurization reaction, and the lining is prevented from being caused by the excessive temperature. Loss. Please refer to Figure 2 for the differential thermal analysis of the primary desulfurization slag. Figure 2 shows a significant endothermic peak at 1432 ° C, indicating that the melting point of the primary desulfurization slag is close to 1432 ° C. Since the desulfurization temperature is set at about 1620 ° C 'so' the primary desulfurization slag is easily melt-dispersed in the high-temperature molten steel to cover the surface of the molten steel 'exposure of the unreacted calcium oxide portion for the desulfurization reaction 201124539. In the embodiment, the primary desulfurization slag is directly added into the molten steel, and the structure of the slag is not destroyed in the air, so that the calcium oxide in the slag is exposed to the molten steel, and the reactivity of the internal oxidation of the primary desulfurization slag can be maintained, and the desulfurization reaction is promoted. Therefore, the effect of applying the same batch of calcium oxide to at least two heats can be achieved, and no additional desulfurizing agent is needed. In addition, since the melting point of the desulfurization slag is low, it exhibits a semi-flow state in the high-temperature molten steel, and has better coverage than the particulate calcium oxide, and is capable of isolating external oxygen. According to an embodiment of the present embodiment, the desulfurization effect can be further promoted by controlling the content of free oxygen in the second molten steel. The free oxygen content is controlled below about 20 ® ppm for better desulfurization. The method of controlling the oxygen content may include adding a deoxidizing agent to the second molten steel when the desulfurization reaction is carried out, for example, purely in Lv or pure town. EXAMPLES: A commercially available oxidation plant is subjected to a refining treatment to increase the surface area, form calcium oxide pellets, and store in a vacuum or a closed environment for use to prevent the calcium oxide particles from being wetted to form calcium hydroxide and affect the desulfurization ability. The original sulphur content of the scrap used is 0.054 wt.%, and other components include carbon 0.015 wt.%, Shixi 0.021 wt.%, sharp 0.087 wt.%, phosphorus 0.018 wt.%; the rest include chromium, nickel, molybdenum , copper, zinc, Ming, titanium, about, etc., the content of which is less than 0.01 wt.%. 70 kg of the above scrap was placed in a high-frequency furnace to prepare a melting chain, and the temperature of the high-frequency furnace was controlled to slowly increase from 1525t, 1602°C, 1615°C to 1631°C to remove the waste generated in the steel. In addition, strontium iron and ferromanganese can be added in an appropriate amount to adjust the molten steel composition. 201124539 1120g of calcium oxide pellets (added amount is about 50% of the amount of molten steel added to the molten steel, desulfurization reaction and slagging in 1622 minutes. 0 〇月,.,,, 3rd For the appearance of the molten steel and the desulfurized slag in the first molten steel desulfurization reaction of the present embodiment, the third item (a) is a photograph of the oxidation material covering the steel water for the desulfurization reaction; 3 (^ is the steel water poured into the sand mold when the tapping water; 3 (c) is): water: = - the desulfurization reaction produced by the - secondary desulfurization slag appearance, -=Desulfurization fish is semi-fluid when taken out from the molten steel. After cooling, the finer oxidized 1 material is formed into a larger block. r=:t is an enlarged view), due to the adsorption of impurities and adherence The weight of the steel: the weight of the re-receiving will be slightly larger than the weight of the originally added oxidized granules. In the present embodiment, the recovered desulfurization amount is 1280 g.
依，本實施例之方法，同一批氧化辦粒料可至少 於兩個爐:欠的盛峨鋼水精鍊脫硫⑽1參昭第4A、4B m:批氧化·料進行兩個爐次的盛鋼桶鋼水精 鍊脫硫反應的結果圖。第4A圖及第4B圖的左邊縱 含量,、右邊縱轴為游離氧含量相對於時間的關係圖，實: 方塊連接之曲線為硫含量隨時間變化曲線，空心圓 之曲線為在鋼液中之游離氧隨時間變化曲線。7 第4a圖為第一爐次，利用新鮮之氧化舞粒料進扞脱 硫反應的結果；第4B目為第二爐次，利用第一爐次所產 之一次脫硫渣回收再進行脫硫反應的結果。 第4A圖中，當游離氧含量控制在20 ppm以下時，以 新鮮之氧化鈣粒料進行鋼水脫硫反應，可於2〇分鐘左右將 201124539 鋼水中的硫含量降低至0.03 wt.%的標準以下。 第4B圖中，當游離氧含量控制在20 ppm以下時，以 第一爐次所產出之一次脫硫渣回收再進行脫硫反應，約於 30分鐘左右即可將鋼水中的硫含量降低至0.03 wt.%的標 準以下。 根據第4A圖及第4B圖的結果，證實以本發明實施方 式的方法，可有效利用進行過至少一次脫硫反應所產出之 一次脫硫渣再進行另一爐次的脫硫反應，在相同條件下所 需的脫硫時間相去不遠，且可達到製備結構鋼等級的精鍊 程度（硫含量0.03 wt.%以下）。 本發明實施例之一次脫硫渣，使用於盛鋼桶鋼水脫硫 並達到0.03 wt.%以下硫含量所需的時間約為30-50分鐘以 内，恰可配合一般電爐煉鋼之連鑄程序，即精鍊時間40-50 分鐘後直接進入分配器，完全適用於現有一貫化作業之電 爐鋼廠的生產流程。 由上述本發明實施方式可知，應用本發明具有下列優 點： 一、 有效再利用盛鋼桶鋼水精鍊之脫硫爐渣，脫硫效 率與新鮮脫硫劑接近，且可達到製備結構鋼等級的精鍊程 度。 二、 脫硫爐渣回收再利用之程續簡單，不需前處理及 額外設備，即可達到高效率的脫硫效果，確實節省時間及 處理成本。 雖然本發明已以實施方式揭露如上，然其並非用以限 定本發明，任何熟習此技藝者，在不脫離本發明之精神和 201124539 範圍内，當可作各種之更動與潤飾，因此本發明之保護範 圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、優點與實施例 能更明顯易懂，所附圖式之說明如下： 第1圖係繪示依照本發明實施方式的一種盛鋼桶鋼水 精鍊脫硫的方法流程圖。 φ 第2圖為一次脫硫渣的熱差分析圖。 第3圖為本實施例脫硫反應進行時之熔融鋼水與脫硫 渣的外觀照片，（A)為氧化鈣粒料覆蓋於鋼水上的照片， (B )為出鋼水時將鋼水倒入砂模的照片，（C )為產出的 一次脫硫渣外觀照片。 第4A圖為利用新鮮之氧化鈣粒料進行脫硫反應的結 果。 第4B圖為利用第一爐次所產出之一次脫硫渣回收再 φ 進行脫硫反應的結果。 120 :步驟 【主要元件符號說明】 110 :步驟According to the method of the present embodiment, the same batch of oxidized pellets can be at least two furnaces: deficiated sulphur steel refining desulfurization (10) 1 ginseng 4A, 4B m: batch oxidation and material for two furnaces of steel drum The result of the molten steel refining desulfurization reaction. The vertical content of the left side of the 4A and 4B figures, and the vertical axis of the right side are the relationship of the free oxygen content with respect to time. Actual: The curve of the square connection is the curve of the sulfur content with time, and the curve of the hollow circle is in the molten steel. The curve of free oxygen over time. 7 Figure 4a shows the results of the desulfurization reaction using fresh oxidized dance pellets in the first heat, and the second heat in the fourth heat, using the primary desulfurization slag produced in the first heat to recover the sulfur. The result of the reaction. In Figure 4A, when the free oxygen content is controlled below 20 ppm, the molten steel desulfurization reaction is carried out with fresh calcium oxide pellets, and the sulfur content in 201124539 molten steel can be reduced to 0.03 wt.% in about 2 minutes. The standard is below. In Fig. 4B, when the free oxygen content is controlled below 20 ppm, the primary desulfurization slag produced in the first heat is recovered and then subjected to a desulfurization reaction, and the sulfur content in the molten steel can be lowered in about 30 minutes. It is below the standard of 0.03 wt.%. According to the results of FIG. 4A and FIG. 4B, it is confirmed that the method according to the embodiment of the present invention can effectively utilize the primary desulfurization slag produced by performing at least one desulfurization reaction and then carry out the desulfurization reaction of another heat. The desulfurization time required under the same conditions is not far away, and the degree of refining of the prepared structural steel grade (sulfur content of 0.03 wt.% or less) can be achieved. The primary desulfurization slag of the embodiment of the invention is used for desulfurization of steel ladle steel and the time required to reach a sulfur content of less than 0.03 wt.% is about 30-50 minutes, which can be matched with continuous casting of general electric furnace steelmaking. The program, which takes 40-50 minutes of refining time, directly enters the distributor and is fully suitable for the production process of existing furnaces in the existing furnaces. It can be seen from the above embodiments of the present invention that the application of the present invention has the following advantages: 1. Effectively reusing the desulfurization slag of the steel refining of the steel drum, the desulfurization efficiency is close to that of the fresh desulfurizing agent, and the refining of the structural steel grade can be achieved. degree. Second, the process of recycling and re-using the desulfurization furnace slag is simple, without pre-treatment and additional equipment, it can achieve high-efficiency desulfurization effect, which saves time and processing costs. The present invention has been disclosed in the above embodiments, and is not intended to limit the present invention. Any one skilled in the art can make various changes and modifications without departing from the spirit of the present invention and 201124539. The scope of protection is subject to the definition of the scope of the patent application attached. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; Flow chart of the method for refining desulfurization of steel drum steel. φ Fig. 2 is a heat difference analysis diagram of primary desulfurization slag. Fig. 3 is a photograph showing the appearance of molten steel water and desulfurization slag during the desulfurization reaction of the present embodiment, (A) is a photograph of the calcium oxide pellets covering the steel water, and (B) is the molten steel when the molten steel is discharged. Pour a picture of the sand mold, (C) is a photograph of the appearance of the primary desulfurization slag produced. Figure 4A shows the results of a desulfurization reaction using fresh calcium oxide pellets. Figure 4B shows the results of the desulfurization reaction using the primary desulfurization slag produced by the first heat and then φ. 120 :Step [Key component symbol description] 110 : Step