546387 A7 ____B7_ 五、發明説明（i ) [技術領域] 本發明係有關於一種移動床爐用爐床，該移動床爐係 用以於在爐内移動之移動床上，將含有碳材料之氧化鐵塊 狀物加熱、還原以製造還原鐵塊狀物者，舉例而言，係有 關於一種用以進行還原鐵製造之旋轉爐床爐用爐床。 [習知背景] 與製造還原鐵塊狀物之移動床爐用爐床有關之習知技 術，諸如美國專利第4, 597, 564號，其中揭露於旋轉爐 床爐之爐床上面，具有可暴露於熱之面之爐床，且該爐床 係以全燒白雲石粒所構成的耐火材製成。此習知技術中， 由全燒白雲石粒構成之耐火材厚度為7.542cm，而其化學 組成為· CaO=約 54%、MgO=約 38%、Fe203=約 4% 以 下’粒度則具有100%負lcm之粒度。 然而，雖然全燒白雲石粒較菱鎂石粒廉價，但因其非 作為廢棄物而產生者，故必須另外購入以供移動床爐使 用，因而需要其費用。 又，於日本專利公開公報2997459中揭露將主成分為 氧化鐵之爐床材料（全鐵含量3〇%以上）於移動床之基礎耐 火物上施工成層狀之爐床。 該習知技術中，使用將爐床材料於還原爐内燒結而形 《之移動床，該燒結而形成之移動床於還原製程之操作溫 | 度下為非熔融狀態。將操作溫度升高至125〇〜135〇它時燒 結結束，並形成堅硬多孔質之爐床。 又，該習知技術中，+基礎耐火物與該爐床材料之間 本纟國國家標準（CNS) A4規格7^0X297公釐)~" ---~546387 A7 ____B7_ V. Description of the Invention (i) [Technical Field] The present invention relates to a hearth for a moving bed furnace. The moving bed furnace is used on a moving bed moving inside the furnace, and will contain iron oxide containing carbon materials. Those who heat and reduce lumps to produce reduced iron lumps are, for example, related to a hearth for a rotary hearth furnace for making reduced iron. [Conventional background] Known technologies related to the manufacture of hearths for moving hearth furnaces of reduced iron lumps, such as U.S. Patent No. 4,597,564, which are disclosed on the hearth of rotary hearth furnaces, have The hearth exposed to the hot side, and the hearth is made of refractory material composed of completely burned dolomite particles. In this conventional technique, the thickness of the refractory material composed of completely burned dolomite particles is 7.542 cm, and its chemical composition is CaO = about 54%, MgO = about 38%, Fe203 = about 4% or less. The particle size has 100 % Negative lcm particle size. However, although the whole-burned dolomite grains are cheaper than the magnesite grains, since they are not generated as waste, they must be purchased separately for the use of a moving bed furnace, which requires its cost. In addition, Japanese Patent Laid-Open Publication No. 2997459 discloses that a hearth material whose main component is iron oxide (a total iron content of 30% or more) is constructed as a layered hearth on a base refractory of a moving bed. In this conventional technique, a moving bed in which a hearth material is sintered in a reduction furnace is used, and the moving bed formed by the sintering is in a non-melted state at the operating temperature of the reduction process. Increasing the operating temperature to 125 ° to 135 ° will complete the sintering and form a hard porous hearth. Also, in this conventional technology, between the + base refractory and the hearth material, this country's national standard (CNS) A4 specification 7 ^ 0X297 mm) ~ " --- ~
t. (請先閲讀背面之注意事項再填寫本頁) -4- 546387 A7 Γ_____________ Β7 五、發明説明（2) 。介有主成分為氧化鎂之中間層。氧化鎂熔點乃高達2800 °C，於操作溫度i30(rc左右不會產生其他耐火物與低熔點 物質。主成分為氧化鎂之中間層宜形成為氧化鎂熔塊破碎 後之粉狀、粒狀、塊狀者。 然而，因必須購入主成分為氧化鐵之爐床材料或主成 分為氧化鎂之中間層，故有需要購入費用之缺點。 且於‘ &生鐵或鋼鐵等之製鐵製程中，為了保護爐 及容器物而於内部鋪設有耐火物。因其耐火物會損耗，故 必須定期地重新鋪設，且每噸粗鋼約產生7kg耐火物屑， 該耐火物屑產生量係以碳酸鎂（氧化鎂）系最多，約佔全體 的 40% 〇 然而，目前處理及利用狀況，於日本國内係填埋或保 管約佔68%，而當作有價物活用者只有僅約佔15%。尤其 最近，更有填埋地不足、填埋費用高漲之問題。 [發明之揭示] 本發明之課題係於提供一種耐熱性佳，且使用廉價材 料之爐床，其係、用以解決如前述與移動床爐用爐床有關之 習知技術缺點者。 本發明係將包含有氧化鎂之耐火物屑鋪設於移動床爐 用爐床上面，而一面確保耐熱性一面削減爐床材料購入費 用9並同時推動耐火物屑再生者，其要旨如下。 (1)本發明之移動床爐用爐床，係用以將含有還原劑之 氧化鐵塊狀物於移動床上加熱、還原以製造還原鐵塊狀物 者5其特徵在於：於前述爐床上面鋪設有包含氧化鎂在内 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐）t. (Please read the notes on the back before filling this page) -4- 546387 A7 Γ _____________ Β7 V. Description of the invention (2). An intermediate layer whose main component is magnesium oxide is interposed. The melting point of magnesium oxide is as high as 2800 ° C. At the operating temperature of i30 (rc, no other refractory and low melting point substances will be produced. The intermediate layer whose main component is magnesium oxide should be formed into a powdery or granular form after the magnesium oxide frit is broken. However, because it is necessary to purchase the hearth material whose main component is iron oxide or the intermediate layer whose main component is magnesium oxide, there is a disadvantage of the need to purchase costs. And in the iron & steel manufacturing process such as pig iron or steel In order to protect the furnace and the container, refractory is laid inside. Because the refractory will be lost, it must be re-layed regularly. About 7 kg of refractory chips are produced per ton of crude steel. The amount of refractory chips is based on carbonic acid. Magnesium (magnesium oxide) is the largest, accounting for about 40% of the total. However, the current state of processing and utilization, about 68% of the landfill or storage in Japan, and only about 15% of the use of valuables In particular, recently, there are problems of insufficient landfill cost and high landfill cost. [Disclosure of the Invention] The subject of the present invention is to provide a hearth which has good heat resistance and uses inexpensive materials. Previously The disadvantages of the conventional technology related to the hearth for the moving hearth furnace. The present invention is to lay refractory chips containing magnesium oxide on the hearth for the hearth of the moving hearth furnace, while reducing the purchase cost of the hearth material while ensuring heat resistance Those who promote the regeneration of refractory debris at the same time have the following main points: (1) The hearth for a moving bed furnace of the present invention is used to heat and reduce iron oxide blocks containing a reducing agent on a moving bed to produce reduced iron blocks. The objector 5 is characterized in that the paper size including magnesium oxide is laid on the hearth, and the paper size is in accordance with Chinese National Standard (CNS) A4 (210X297 mm)
*可| (請先閲讀背面之注意事項再填寫本頁) 546387 A7 B7 五、發明説明（3 ) 之而ί火物屑者。 …- f (請先閲讀背面之注意事項再填寫本頁) (2) 如（1)項之移動床爐用爐床，其中該耐火物屑中之氧 化鎂含有量係30質量％以上者。 (3) 如（1)或（2)項之移動床爐用爐床，其中該耐火物屑上 面具有由氧化鐵塊狀物構成之耐熱層者。 於此，所謂的還原劑，可為碳材料等粉狀固態還原材， 並以容易取得之焦炭末或煤粉為佳。 所明氧化鐵塊狀物，係將包含有金屬氧化物之粉塵或 金屬碎渣回收而成型者，以使用雙輥成型機成型為橢圓形 煤磚之塊狀物為佳。 、可| 所謂耐火物屑，舉例而言，係於製造生鐵或製鋼等製 私中，作為耐火材使用而用完之耐火物粉碎、分類後之屑， 以包含有多量MgQ之耐火物屬為佳。該财火物屑乃作為廢 棄物而大量產生者，故不需購入費用。 所謂由氧化鐵塊狀物構成之耐熱層，即，於氧化鐵塊 狀物在移動床加熱、還原過程中殘留於爐床上之氧 狀物所形成之耐熱層。 於爐床上面鋪設有主成分為氧化镁之耐火物屑之移動 床上，供給含有碳材料之氧化鐵塊狀物，而進行加熱、還 原前述氧化鐵塊狀物時，該氧化鐵塊狀物之一部份沒有藉 排出裝置完全排出，而殘留於移動床上。因該殘留之氧二 鐵塊狀物中含有碳，故使前述碳燃燒氣化， 狀物。 礼貝塊 於通常之操作溫度（讓~⑽。c)下，氧化鐵塊狀物不 本紙張尺度適财關家標準（CNS) A4規格⑽χ297^ -6- 546387 A7 -——______B7 五、發明説明()""'" " 4 會熔融。萬一爐内溫度部分地成為高溫，或使前述氧化鐵 f狀物熔點部分地降低等，以致前述氧化鐵塊狀物熔融 時，因包含有氧化鎂（理想含有量為3〇%重量％以上）之耐 火物之耐火物屑熔點高，故不會使耐火物屑通過。 氧化鐵塊狀物一旦熔解並再凝固，而黏著於爐床之基 礎耐火物時，會形成堅固之基岩狀，很難藉排出裝置加以 排出。如前述於氧化鐵塊狀物與爐床之基礎耐火物之間配 没有尚熔點耐火物屑時，即使該氧化鐵塊狀物一旦熔解並 再凝固，亦不會黏著於爐床之基礎耐火物，而可藉排出事 置於耐火物屑層輕易地剝離，且易於排出。 [圖式之簡單說明] 第1圖係移動床爐用爐床由侧面觀看之全體圖。 第2圖係本發明所用之MgO-FeO-Si〇2系耐火物屑之 狀態圖。 第3圖係本發明所用之MgO-CaO-Si〇2系耐火物屑之 狀態圖。 第4圖係本發明所用之Mg〇_A12〇3-Si〇2系耐火物屑之 狀態圖。 第5圖係顯示本發明之耐火物屑之製造程序圖。 [發明之實施形態] 以下將藉第1圖詳細地說明本發明之移動床爐用爐床 實施形態。爐床之結構係於爐床基礎耐火物1上鋪設有耐 火層2，且其上存在由氧化鐵塊狀物構成之耐熱層4。 氧化鐵塊狀物3係藉塊狀物進料裝置6進料於爐床 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐） (請先閱讀背面之注意事項再填寫本頁) .、訂| 546387 A7 --------B7_________ 五、發明説明（） 5 上，並於爐床移動過程中加熱、還原，而變化為還原鐵塊 狀物5。忒遏原鐵塊狀物5則藉塊狀物排出裝置7朝爐外 排出。 爐床上之耐火物屑2之層厚度宜為5〇mm以上。若不 足50mm則一旦溶解並再凝固之氧化鐵塊狀物藉排出裝 置在耐火物屑層剝離、排出時，爐床基礎耐火物上之耐火 物屑層可能會消失，使爐床基礎耐火物裸露。 耐火物屑2之粒徑宜為5inm以上且丨〇mm，且重量佔 80%以上者。若1〇mm以上屑粒過多，則一旦熔解並再凝 固之氧化鐵塊狀物藉排出裝置在耐火物屑層剝離、排出 時，耐火物屑之剝離厚度會增厚。 接著’針對本發明所用之耐火物屑之熔融溫度，用第2 圖〜第 4 圖之 Mg0-Fe〇-Si〇2 系、Mg0_Ca〇_Si〇2 系、及 MgO-Al2(VSi〇2系之狀態圖作為實施例進行說明。 第2圖係MgO-FeO-Si〇2系狀態圖，第3圖乃* Yes | (Please read the precautions on the back before filling out this page) 546387 A7 B7 V. The description of the invention (3) Those who ignite fire debris. …-F (Please read the precautions on the back before filling this page) (2) For the hearth for moving bed furnaces such as (1), the content of magnesium oxide in the refractory chips is 30% by mass or more. (3) The hearth for a moving hearth furnace according to item (1) or (2), in which the refractory chips have a heat-resistant layer composed of iron oxide blocks. Here, the so-called reducing agent may be a powdery solid reducing material such as a carbon material, and it is preferably coke powder or pulverized coal that is easily available. The iron oxide lumps described are those formed by recovering dust or metal slag containing metal oxides, and it is preferable to use a two-roll forming machine to form lumps of oval briquettes. ， 可 | The so-called refractory scraps are, for example, smashed and classified scraps of refractory materials used in the manufacture of pig iron or steel and used as refractory materials. The refractory materials containing a large amount of MgQ are good. The firewood debris is generated in large quantities as waste, so no purchase cost is required. The so-called heat-resistant layer composed of iron oxide lumps is a heat-resistant layer formed by iron oxide lumps remaining on the hearth during heating and reduction of the moving bed. On the moving bed on which a refractory chip consisting mainly of magnesium oxide is laid on the hearth, an iron oxide block containing a carbon material is supplied, and heating and reduction of the aforementioned iron oxide block are performed. Part of it was not completely discharged by the discharge device, but remained on the moving bed. Because the residual iron oxide block contains carbon, the carbon is burned and gasified. Libei block at the normal operating temperature (ranging ~ ⑽.c), iron oxide block is not the paper size suitable for financial standards (CNS) A4 specification ⑽χ297 ^ -6- 546387 A7 -----______ B7 V. Invention Explanation () " " '" " 4 will melt. If the temperature in the furnace becomes partly high, or the melting point of the iron oxide f-like substance is partially lowered, etc., so that when the iron oxide lump is melted, magnesium oxide is contained (the ideal content is 30% by weight or more). The refractory chips have a high melting point, so they will not pass through the refractory chips. Once the iron oxide lumps melt and re-solidify, and stick to the base refractory of the hearth, it will form a solid bedrock-like shape, which is difficult to be discharged by the discharge device. As mentioned above, when there is no refractory refractory chip between the iron oxide block and the base refractory of the hearth, even if the iron oxide block once melts and solidifies, it will not stick to the base refractory of the hearth. , And can be easily peeled off by placing it in the refractory chip layer, and easy to discharge. [Brief description of the drawings] Fig. 1 is an overall view of a hearth for a moving hearth furnace viewed from the side. Fig. 2 is a state diagram of MgO-FeO-Si02-based refractory chips used in the present invention. Fig. 3 is a state diagram of MgO-CaO-Si02-based refractory chips used in the present invention. Fig. 4 is a state diagram of Mg〇_A12〇3-Si〇2 refractory chips used in the present invention. Fig. 5 is a flow chart showing the manufacturing process of the refractory chips of the present invention. [Embodiment of the invention] Hereinafter, an embodiment of the hearth for a moving hearth furnace of the present invention will be described in detail with reference to Fig. 1. The structure of the hearth is that a refractory layer 2 is laid on the base refractory 1 of the hearth, and there is a heat-resistant layer 4 composed of iron oxide blocks. Iron oxide block 3 is fed by the block feeding device 6 to the hearth. The paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling this page) ., Order | 546387 A7 -------- B7_________ 5. Description of the invention () 5 and heating and reduction during the hearth movement, and change to reduced iron block 5. The original iron block 5 is discharged out of the furnace by the block discharge device 7. The layer thickness of the refractory chips 2 on the hearth is preferably 50 mm or more. If it is less than 50mm, once the refractory debris layer is dissolved and re-solidified by the exhaust device, the refractory debris layer on the hearth base refractory may disappear, leaving the hearth foundation refractory exposed. . The particle diameter of the refractory chips 2 is preferably 5 inm or more and 0 mm, and the weight accounts for more than 80%. If there are too many crumbs above 10 mm, once the refractory crumb layer is melted and re-solidified by the discharge device and peeled off and discharged, the refractory crumb peeling thickness will increase. Next, according to the melting temperature of the refractory chips used in the present invention, the Mg0-Fe〇-Si〇2 system, Mg0_Ca〇_Si〇2 system, and MgO-Al2 (VSi〇2 system) The state diagram is described as an example. Fig. 2 is a state diagram of the MgO-FeO-Si〇2 system, and Fig. 3 is
Mg0-Ca0-Si02 系狀態圖，第 4 圖則為 Mg〇-Al203-Si〇2 系 ^ 狀態圖。依據該等狀態圖，MgO為30%以上時，於大部分 範圍中溶點為15〇〇。〇以上。相對於此，MgO不足30%時， 有生成溶點於13 5 0 C以下之低溶點―化合物之可能性。 然後’針對作為爐床材料使用之耐火物屑之製造方 法’以苐5圖作說明。 首先5回收製造生鐵或製鋼等製鐵過程中所產生之财 火物肩，並依材料類別施行分級處理。 分級處理後之耐火物屑，係分為二階段破碎，以顎 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐） (請先閲讀背面之注意事項再填寫本頁) ’訂丨 五、發明説明（6) 碎機進行一次破碎，使300mm大小之耐火物屑破碎為 大J後’再使1 〇〇mm大小破碎為20mm大小。 接著對5〜20mm大小者與不足5mm大小者進行分類 處理亚將5〜2〇mm大小之耐火物屑作為移動床爐之爐床 材料使用。 此外，亦可將該大小之耐火物屑作為耐火漿料耐火材 之添加材料使用。 亦可使不足5mm大小之耐火物屑經乾燥處理、熔渣選 別、及粉碎處理，而再生作為耐火物原料。 [產業上可利用性] 猎本發明可提供一種耐熱性佳，且使用廉價材料之移 動床爐用爐床。具體而言，因將包含有氧化鎮之耐火物之 耐火物屑鋪設於爐床上面，而可一面確保耐熱性一面削減 爐床材料之講入費用。 又，因使用包含有氧化鎮之耐火物之耐火物屬故可 削減耐火物屑之處理費用（填埋等）。 ^耐火物屬之爐床材料化只要破碎、分類即可，非常簡 進而，即使氧化鐵塊狀物一旦熔解並再凝固，亦合 黏著於爐床之基礎耐火物，容易以排出穿 ’、不會 排出。 、置剝離，且易於 [元件標號對照] 1…爐床基礎耐火物 2…耐火物屑 546387 A7 B7 五、發明説明（7 ) 3.. .氧化鐵塊狀物 4.. .对熱層 5.. .還原鐵塊狀物 6.. .塊狀物進料裝置 7.. .塊狀物排出裝置 (請先閱讀背面之注意事項再填寫本頁) 訂· 本紙張尺度適用中國國家標準（CNS) A4規格（210X297公釐） -10-The state diagram of Mg0-Ca0-Si02 system, and the fourth diagram is the state diagram of Mg〇-Al203-Si〇2 system. According to these state diagrams, when MgO is 30% or more, the melting point is 150% in most ranges. 〇 Above. In contrast, when MgO is less than 30%, there is a possibility that a low melting point-compound having a melting point of less than 1350 ° C may be formed. Next, "the manufacturing method of refractory chips used as a hearth material" will be described with reference to Fig. 5. First of all, the shoulders of wealth and fire generated during iron making such as pig iron or steel are recovered and classified according to the type of material. The graded refractory chips are broken into two stages. The jaw size of the paper applies the Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling this page) 'Order 丨V. Description of the invention (6) The crusher performs a crushing to crush 300mm refractory chips into large J ', and then crush 100mm to 20mm. Next, classify the size of 5-20mm and the size less than 5mm. Use refractory chips of 5-20mm as the hearth material of the moving hearth furnace. In addition, this size of refractory chips can also be used as an additive for refractory slurry refractories. It is also possible to regenerate refractory chips with a size of less than 5 mm as a raw material for refractory materials by drying, slag selection, and crushing. [Industrial Applicability] The present invention can provide a hearth for a moving hearth furnace which is excellent in heat resistance and uses inexpensive materials. Specifically, because the refractory chips including the oxidized refractory are laid on the hearth surface, the cost of the hearth material can be reduced while ensuring heat resistance. In addition, the use of refractory materials including oxidation-resistant refractory materials can reduce the disposal costs of refractory chips (landfill, etc.). ^ The materialization of the refractory hearth is only required to be broken and classified. It is very simple. Even if the iron oxide block is melted and solidified, it will also adhere to the base refractory, which is easy to pass through. Will drain. It is easy to peel off [component number comparison] 1 ... hearth base refractory 2 ... refractory scrap 546387 A7 B7 5. Description of the invention (7) 3. .. Iron oxide block 4.. .. Reduced iron lump 6.. Lump feeding device 7. Lump discharge device (please read the precautions on the back before filling in this page). CNS) A4 size (210X297 mm) -10-