TW201000640A - Process for production of direct-reduced iron - Google Patents

Process for production of direct-reduced iron Download PDF

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Publication number
TW201000640A
TW201000640A TW98113608A TW98113608A TW201000640A TW 201000640 A TW201000640 A TW 201000640A TW 98113608 A TW98113608 A TW 98113608A TW 98113608 A TW98113608 A TW 98113608A TW 201000640 A TW201000640 A TW 201000640A
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Taiwan
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zinc
coal dust
iron
raw material
iron ore
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TW98113608A
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Chinese (zh)
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TWI424065B (en
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Natuki Ishiwata
Hiroyuki Hiroha
Koichi Nushiro
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Jfe Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/006—Starting from ores containing non ferrous metallic oxides
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
    • C21B13/105—Rotary hearth-type furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
    • C21B13/143—Injection of partially reduced ore into a molten bath
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/34—Obtaining zinc oxide
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/02—Working-up flue dust
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2200/00—Recycling of non-gaseous waste material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2100/00—Exhaust gas
    • C21C2100/02—Treatment of the exhaust gas
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2200/00—Recycling of waste material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/216—Sintering; Agglomerating in rotary furnaces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Abstract

A process for the production of direct-reduced iron, which comprises a step of preparing a mixed raw material, a step of charging the mixed raw material, and a reduction step. The step of preparing a mixed raw material is conducted by preparing a mixed raw material containing both an iron ore (X) which contains a high-zinc iron ore (A) containing 0.01mass% or more of zinc and 50mass% or more of iron and a carbonaceous solid reducing agent. The step of charging the mixed raw material is conducted by charging the mixed raw material onto a moving hearth. The reduction step is conducted by providing heat from above the moving hearth and reducing the mixed raw material charged onto the moving hearth to obtain a reduction product.

Description

201000640 六、發明說明： 【發明所屬之技術領域】 本發明係關於使用爐床移動式爐(m〇 vable hearth furnace) 施行含鐵物之還原的方法’特別係關於從高濃度含有辞的鐵 礦中製造還原鐵之方法。 【先前技術】 粗鋼生產法大致可區分為：從鐵礦生產生鐵並形成鋼的高 爐-轉爐法，以及將廢·解並施行精煉的電爐法。隨中國 等新興國家㈣起’全世界的_生產量正急遽增加。特別 係高爐·轉爐法所使用_ ”求較為急迫，不僅價格高 漲，且頗難取得良質鐵礦。 、 之=方之外’亦已知有使用爐床移動式爐的還㈣ 全:二之爐法係製造以還原鐵為代表_ 二 式爐法中，於朝水平方向移_ 上裝載者鐵礦與固態還原材料等，並從上方利用韓射傳南 施仃加熱而將鐵礦還原，並 … 再將溶_屬分離而製造還 平U 3357_ W ㈣如參照日本專利特開 叙報、特開平叫723!2號公報）。 另-，如同鐵礦般’全世界性對鋅的需求正4遽增 口 “⑽已構·題。雖鋅精煉有各種方法七 將硫化礦施行氧化煅燒而劁 —般係 煉製而奸餘/ 輯，躲_4乾式施行 獲仔鋅金屬。相_鋅亦是潛在有硫_、氧化鋅等 098113608 201000640 鋅原料不足的問題。 在鐵原料、鋅原料等資源不足已構成問題的狀況下，本發 明者等：#眼於在鐵射含有較通常更多辞份的含高辞鐵 礦。此種含高鋅鐵礦亦是最好在高爐-轉爐法中使用為原 料仁鋅έ有嚴鬲的原料幾乎尚未被利用。主要理由係礦石 中所έ的鋅將依爐壁附著物的形式殘留於高爐内。礦石中的 鋅伤係經過燒結過程，再被夾帶入高爐甲。被夾帶入高爐中 的鋅將在爐内被縣*蒸氣化，並氧化凝聚於溫度較低且氧 化電位較高的部分處。特別容易凝聚於諸如高爐爐身内壁等 處，並與周遭的焦炭、礦石黏著而使填充物呈鈍態化。此種 鈍態部分稱「擬設」（ansatz)，會使爐内填充物質的下降呈 不安定，誘發「懸料」、「崩料」等麻煩。 依此的話，鋅份雖在高爐操作中係屬於會成為麻煩肇因的 成分，但亦屬有價的金屬。鋅係除屬於例如電池原料之外， 其他亦是屬於為提升鋼板表面耐蝕性而不可或缺的鍍敷材 料等金屬。如前述，一般係將硫化礦施行氧化煅燒而製作氧 化鋅，再依濕式或乾式施行煉製而獲得鋅金屬，但，近年亦 有提案將製鐵煤塵等施行煉製，而獲得粗氧化辞，並當作鋅 煉製原料用的方法。 例如鋅濃度超過lOmass%的粗氡化鋅之情況，藉由施行華 爾滋法(Waelz process)等處理，便可形成高濃度粗氧化鋅， 並可使用為鋅煉製原料。此外，當鋅濃度超過5〇mass%的報 098113608 4 201000640 法等鋅精煉中所使 氧化辞之情況’便可直接使用為例如j s p 用的粗氧化辞。 藉由依此回收的鋅濃度，將隨粗氧化辞的使 幅差異，當然，鋅濃度越高便越有經濟價值，但尚:丄 能兼顧還原鐵與高濃度粗氧化鋅之生產的還原鐵” 法。 /、、之製方 【發明内容】 鐵之 本發明目的在於提供能有效利用含高鋅鐵礦的還 製造方法。 為達成上述目的’本發明將提供具有以下觀點的還原鐵之 製造方法。 ^ [1] ·一種還原鐵之製造方法，係包括有： 準備含有鐵礦(X)與碳系固態還原材料之混合原料的步 驟，而，該鐵礦(X)係含有含高鋅鐵礦(A);該含高鋅鐵礦(⑸ 係含有鋅O.Olmass%以上、鐵5〇mass%以上； 將上述混合原料裝載於爐床移動式爐的爐床上之混合原 料裝載步驟；以及 從爐床上部施行熱供應，而將移動式爐床上所裝载的混合 原料還原，獲得還原生成物的還原步驟。 [2] .如[1]項所記載的還原鐵之製造方法，其中，上述含高 辞鐵礦（A)係含有0.01〜0.5mass%的辞與50〜70mass%的鐵。 [3] ·如[1]項所記載的還原鐵之製造方法，其中，上述含高 098113608 5 201000640 鋅鐵礦(A)係相對於鐵礦(X)，具有1〇〜1〇〇massQ/。的調配比 例。 [4] ·如[1]項所記載的還原鐵之製造方法，其中，上述混合 原料裝載步驟係將經成塊化混合原料裝載於移動式爐床上。 [5] .如[1]項所記載的還原鐵之製造方法，其中，上述還原 步驟係將混合原料依120(rc以上的加熱溫度施行還原。 [6] .如[5]項所記載的還原鐵之製造方法，其中，上述加熱 溫度係1250°C以上且未滿i400〇C。 m.如π]項所記載的還原鐵之製造方法，其中，上述還原 步驟係從爐床上部施行熱供應，而將移動式爐床上所裝載的 混合原料進行還原’使上述混合原料未賴或僅部分炼融， 而獲得還原鐵。 [8] .如[1]項所記載的還原鐵之製造方法，其中，更進一步 包括有：從由上賴床移動式爐所產生的煤塵中，回收粗氧 化鋅的回收步驟； 準備上述祕的步驟鮮備含有鐵離）、讀煤塵、及 碳系固態還原材料的混合原料；而，該鐵礦(χ)係含有含高 鋅鐵礦㈧，該含高鋅鐵礦⑷係含有鋅O.OWs%以上、鐵 50mass%以上。 [9] .如剛所記制還原鐵之製造方法，其中，上述混合 原料係具有〇.45maSS%以上的平均辞濃产。 [1〇].如[9]項所記載的還原鐵之製造H，其巾，上述平 098113608 广 201000640 均鋅濃度係0.45-0.60mass%。 [11] .如[8]項所記載的還原鐵之製造方法，其中，上述含 鋅煤塵係從來自高爐的生成煤塵、來自轉爐的生成煤塵、及 來自電爐的生成煤塵所構成群組中選擇至少丨種的煤塵。 [12] ·如[1]項所§己載的遥原鐵之製造方法，其中，更進一 步包括有：將由爐床移動式爐所生成的煤塵回收，而獲得回 收煤塵的回收步驟； ( 上述準備原料的步驟係準備含有鐵礦(X)、上述回收煤 塵、及碳系固態還原材料的混合原料；而，該鐵礦(χ)係含 有含N鋅鐵礦(A)，該含高鋅鐵礦(A)係含有鋅〇〇lmass%以 上及鐵50mass%以上。 [13] .如[1]項所記載的還原鐵之製造方法，其中，更進一 步包括有： 將由爐床移動式爐所生成的煤塵回收之步驟； ( 將所回㈣煤塵I載於上述移動式爐床上的步驟；以及 從該爐床上部進行熱供應，而從由上述爐床移動式爐所生 成的煤塵中獲得粗氧化鋅的步驟。 [14]·如[1]項所記載的還原鐵之製造方法，其中，更進一 'V ^括有.使上述還原生成物:¾融的⑥融步驟。 [15].如[1]項所記载的還原鐵之製造方法，其_，更進一 步包括有：使上述還原生成物,熔融的您融步驟； 上述混合原料係含有：鐵雜）、碳系固態還原材料、及 098113608 7 201000640 造渣材料；該鐵礦(X)係含有含高鋅鐵礦(A)，該含高辞鐵礦 (A)係含有辞〇.〇imass%以上及鐵50mass%以上。 [16].如[14]項所記載的還原鐵之製造方法’其中，上述熔 融步驟係使上述還原生成物依1400°C以上的加熱溫度熔 融。 [Π].如[16]項所記載的還原鐵之製造方法，其中，上述加 熱溫度係145(TC以上且1500。(：以下。 [18] .如[1]項所記載的還原鐵之製造方法，其中，更進一 步包括有： 使上述還原生成物熔融的熔融步驟；以及 從由上述爐床移動式爐所生成的煤塵中回收粗氧化鋅的 回收步驟； 上述準備原料的步驟，係準備含有鐵礦(χ)、含鋅煤塵、 碳系固態還原材料、及造渣材料的混合原料；該鐵礦(χ)係 含有含高辞鐵礦(Α)，該含高鋅鐵礦(Α)係含有鋅〇 〇lmass% 以上、鐵50mass%以上。 [19] .如[18]項所記載的還原鐵之製造方法’其中，上述混 合原料係具有〇.45mass%以上的平均辞濃度。 [20] .如[19]項所記載的還原鐵之製造方法，其中，上述平 均辞濃度係0.45〜0.60mass%。 [21] ·如[18]項所記載的還原鐵之製造方法’其中，上述含 鋅煤塵係從來自高爐的生成煤塵、來自轉爐的生成煤塵、及 098113608 〇 201000640 1種的煤麈。 其中，更進— 來自電爐料㈣賴構成群財選擇至少 [22].如[1]項所記載的還原鐵之製造方法， 步包括有： 使^還原生成物溶融的炫融步驟；以及 ;m木移動式爐生成的煤塵回收，而獲得回收媒鹿 步驟； $塵的回 上述準備原料的步驟，係準備含有鐵礦⑻、上 塵、碳系固態還原材料、及造渣材料的混合原料：媒 係含有含高鋅鐵礦㈧，該含高辞鐵礦(A)係：:(x) O.Olmass%以上、鐵別麵办以上。 辞 [23].如[1]項所記載的還原鐵之製造方法，其中， 步包括有： 史進一 使上述還原生成物熔融的熔融步驟； 將由爐床移動式爐所生成的煤塵回收之步驟； (,將所时的煤塵裝載於上述移動式爐床上的步驟；： 從该爐床上部進行熱供應，而從由上述爐床移動式及 成的煤塵中獲得粗氧化辞的步驟。 ^现所生 [24].如[1]項所記载的還原鐵之製造方法，其中， 混合原料裝載步驟之前，更進一步包括有：為在移動=上述 上所裝載的碳質材上積層混合原料，而使碳f #^床 式爐床上的碳質材裝載步驟。 ；私動 【實施方式】 098113608 9 201000640 實施形態1 : 貫施开> 態1的還原鐵之製造方法’係包括有：準備混合原 料的步驟、混合原料裝載步驟、還原步驟、及熔融步驟。 上述準備混合原料的步驟，係準備將鐵礦（其係含有含高 鋅鐵礦；該含高鋅鐵礦係含有：鋅001mass%以上、鐵 50maSS%以上）、碳系固態還原材料、及造渣材料相混合的 混合原料。上述混合原料裝載步驟係將上述混合原料裝載於 移動式爐床上。上述還原步驟係從爐床上部進行熱供應，而 將移動式爐床上所裝載的混合原料還原。上述熔融步驟係使 還原生成物溶融。 本發明者等係使用含高鋅鐵礦，為能有效利用所含有的鐵 伤與鋅伤’便考慮使用爐床移動式爐。使用爐床移動式爐的 粒鐵之製造方法’係製造還原鐵的製程之一，在朝水平方向 移動的爐床’裝載著鐵礦與固態還原材料等，並從上方進行 韓射傳熱而施行加熱’便將鐵礦還原，在爐床上使該還原生 成物炫融’而將炫潰與金屬分離，便製得屬於還原鐵的粒 鐵。 該爐床移動式爐係在加熱爐的爐床朝水平移動過程中便 施行加熱的爐。所謂「朝水平移動的爐床」代表性係有如圖 1所示旋轉移動形態。具有旋轉移動形態的爐床移動式爐， 特別稱「轉腔爐」（rotary hearth furnace)。實施形雜！中， 使用此種爐床移動式爐(特別係轉膛爐），對含高辞鐵礦施行 098113608 10 201000640 還原•炫融處理，而製得還原鐵的粒鐵。以下，針對爐床移 動式爐係使用轉膛爐的情況，依實施形態1進行說明。 另外，實施形態1所使用之所謂「含高辞鐵礦」，相較於 通常利用為高爐原料的鐵礦之下，屬鋅含有量較高，一般係 屬於含有鋅O.Olmass%以上、鐵50mass°/〇以上的鐵礦。實施 形態1所使用含高鋅鐵礦的鋅含量及鐵含量上限並無限 制’因為屬於鐵礦而自行決定，相關鋅係例如〇5mass%程 ( 度以下、相關鐵係例如70mass%程度以下。此外，含高辞鐵 礦的NkO、Re等鹼成分含有量，係依氧化物換算計通常 0.08mass%以上。鹼成分含有量較佳係lmass%以下，理由 係能有效地預防轉膛爐排氣系統阻塞。 實施形態1係使用此種含高鋅鐵礦進行粒鐵製造的技 術’將含高鋅鐵礦利用轉膛爐進行還原時，亦可混合普通鐵 礦使用。混合普通鐵礦使用的情況，亦是含高鋅鐵礦=配入 ： 礦石整體的約l〇maSS%以上時將可適當地獲得實施形態工 效果。 使用圖1，針對實施形態1所用的轉膛爐一實施形態進行 說明。轉膛爐1係如圖1所示，利用經區分為預熱帶2&仃 還原帶2b、溶融帶2c及冷卻帶2d的爐體2，覆蓋著旋轉&移 動的爐床3。在該旋轉爐床3上裝載著例如由含高鋅鐵礦與 固態還原材料構成的原料4。該原料4係使用將含高鋅鐵 礦反系固怨還原材料、及造渣材料進行混合的混合原料 098113608 11 201000640 / 二★下述亦可把行成塊化。覆蓋旋轉爐床3的爐體 ^著耐火物。且為保護爐床耐火物，亦有在爐床3 ，並在其上面積層原料4的情沉。此外，在爐 L，=:a置燃燒器5 ’將該燃燒器5的燃料燃燒熱當作 ：疋轉爐床3上的混合原料4中之鐵鑛還原。另外， 圖1中’ 6係將原料裝人旋轉爐床3±的裝入裝置，了係將 還原物排出的排出裝置，8係冷卻裝置。此外，爐體2内的 環境溫度係設為左右’通常在溶融帶中控制為咖 °C左右的高温。 含高鋅鐵擴係含有依照產地在量方面會有差異' 分。此外’在碳系固態還原材料代表例的煤戾、煤焦隹 中含有灰分。所以，僅施行還原操作的爐床移動式爐法:炭 同於而爐·轉爐法’在成品還原鐵中混人脈石的情形係益不 避免，且亦會有來自還原材料的灰分附著於成品上並現2 可能性。當在轉腔爐的爐床上將原料施行還原·溶融時，飞 =還原中所生成的金屬、與殘_炫渣迅速分離，可_ 咼後度成品粒鐵。 X件 貫施形態1所獲得粒鐵係如上述，施行還原、溶融 溶造成分分離’再從轉膛爐的排出物，於施行壓縮等之^ 狀態下，表觀密度可達5曝咖3以上。另外，通^的 成品粒鐵係經由篩分步驟，便可將粒徑形成3軸以上 100mm以下。 上、 098113608 12 201000640 吏用轉腔爐，對含高鋅鐵;廣施行還原處理時，亦、 a g]態還原材料與造渣材料，並裝載於旋 床上。碳系固態還原材料係諸如煤炭、焦炭、石墨等:爐 材料係諸如石灰粉、白雲石、蛇紋岩等含有㈤、 驗性成分等等。 2〇等201000640 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a method for performing reduction of iron-containing materials using a m〇vable hearth furnace, particularly regarding iron ore containing high concentration A method of manufacturing reduced iron. [Prior Art] The crude steel production method can be roughly classified into a blast furnace-converter method in which iron is produced from iron ore and forms steel, and an electric furnace method in which waste is decomposed and refined. With the emerging countries such as China (4), the world's production volume is increasing rapidly. In particular, the use of blast furnace and converter method is more urgent, not only is the price high, but it is difficult to obtain good quality iron ore. It is also known to use the hearth mobile furnace. (4) Full: 2 The furnace method is mainly represented by reduced iron. In the second furnace method, the iron ore and solid reduction materials are loaded in the horizontal direction, and the iron ore is reduced by heating from the top. Separate the solute and make it. U 3357_ W (4) See Japanese Patent Special Report, pp. 723! 2 for the other.) - As with iron ore, 'the demand for zinc worldwide is positive 4遽增口" (10) has been constructed. Although there are various methods for zinc refining, the sulphide ore is oxidized and calcined, and the smelting and refining system is used. Phase _ zinc is also a potential sulfur _, zinc oxide, etc. 098113608 201000640 zinc raw materials are insufficient. In the case where the shortage of resources such as iron raw materials and zinc raw materials has constituted a problem, the present inventors and the like: # Eyes contain a high iron ore containing more normal credits in the iron shot. Such high-zinc-containing iron ore is also preferably used in the blast furnace-converter process as a raw material. The main reason is that the zinc in the ore will remain in the blast furnace in the form of attachments to the furnace wall. The zinc damage in the ore is sintered and then entrained into the blast furnace. The zinc entrained in the blast furnace will be vaporized by the county in the furnace and oxidized and condensed at a portion where the temperature is low and the oxidation potential is high. It is particularly easy to condense on the inner wall of a blast furnace shaft, etc., and adheres to coke and ore around it to make the filler passivated. Such a passive part is called "ansatz", which causes the drop of the filling material in the furnace to be unstable, which causes troubles such as "suspension" and "collapse". In this case, although zinc is a component that causes trouble in blast furnace operation, it is also a valuable metal. In addition to the battery materials, for example, the zinc system is a metal such as a plating material which is indispensable for improving the corrosion resistance of the steel sheet surface. As described above, in general, the sulphide ore is subjected to oxidative calcination to produce zinc oxide, and the zinc metal is obtained by wet or dry refining. However, in recent years, there has been a proposal to refine the iron-making dust and the like to obtain a crude oxidation word. And used as a method for zinc refining raw materials. For example, in the case of a coarse zinc oxide having a zinc concentration exceeding 10% by mass, a high-concentration crude zinc oxide can be formed by a treatment such as a Waelz process, and a raw material for zinc refining can be used. Further, when the zinc concentration exceeds 5 〇 mass%, the oxidized word in the zinc refining of the 098113608 4 201000640 method can be directly used as the crude oxidized word for, for example, j s p . With the zinc concentration recovered according to this, the difference in the amount of the oxidized slag will be changed. Of course, the higher the zinc concentration, the more economic value, but it is still: the reduced iron which can reduce the production of reduced iron and high-concentration crude zinc oxide. [Invention] The object of the invention is to provide a method for producing a high-zinc-containing ore which can effectively utilize the high-zinc iron ore. In order to achieve the above object, the present invention provides a method for producing reduced iron having the following points. ^ [1] A method for producing reduced iron, comprising: preparing a mixed raw material containing iron ore (X) and a carbon-based solid reducing material, wherein the iron ore (X) contains high zinc iron Mine (A); the high-zinc-iron ore ((5) contains zinc O. Olmass% or more, iron 5 mass% or more; the mixed raw material loading step of loading the above mixed raw material on a hearth of a hearth mobile furnace; The method of producing a reduced iron according to the item [1], wherein the method of producing the reduced iron according to the item [1], wherein the heat source is supplied from the furnace bed, and the mixed material to be loaded on the movable hearth is reduced. The above-mentioned high iron ore (A) contains 0 [01] The method for producing reduced iron according to [1], wherein the above-mentioned high-containing 098113608 5 201000640 zinc-iron ore (A) is relatively The method for producing reduced iron according to the item [1], wherein the mixed raw material loading step is carried out in the iron ore (X). [5] The method for producing reduced iron according to the above aspect, wherein the reducing step is performed by reducing the mixed raw material at a heating temperature of 120 or more. The method for producing reduced iron according to the item [5], wherein the heating temperature is 1250 ° C or more and less than i400 〇 C. m. The method for producing reduced iron according to the item π], wherein The above reduction step is to carry out heat supply from the hearth, and to reduce the mixed raw materials loaded on the mobile hearth, so that the mixed raw materials are not or only partially fused to obtain reduced iron. [8] . The method for producing reduced iron according to the item 1, wherein the method further comprises: moving from the bed In the coal dust generated by the dynamic furnace, the recovery step of recovering the crude zinc oxide; preparing the above-mentioned secret step to prepare the mixed raw material containing the iron separation), the read coal dust, and the carbon-based solid reduction material; and the iron ore (χ) Containing high-zinc iron ore (8), the high-zinc-iron ore (4) contains zinc O.OWs% or more and iron 50 mass% or more. [9] . The method for producing reduced iron as described, wherein the mixed raw material The product has an average yield of 〇.45maSS% or more. [1〇]. For the production of reduced iron described in [9], the towel has a uniform zinc concentration of 0.45-0.60 mass%. [11] The method for producing reduced iron according to the item [8], wherein the zinc-containing coal dust is selected from the group consisting of coal dust generated from a blast furnace, coal dust generated from a converter, and coal dust generated from an electric furnace. At least the kind of coal dust. [12] The method for manufacturing the remote iron as set forth in [1], further comprising: recovering the coal dust generated by the hearth moving furnace, and recovering the recovered coal dust; The step of preparing the raw material is to prepare a mixed raw material containing iron ore (X), the above-mentioned recovered coal dust, and a carbon-based solid reducing material; and the iron ore (χ) contains N-containing zinc iron ore (A), which contains high zinc. The iron ore (A) is a method for producing reduced iron according to the item [1], which further includes: a moving furnace by a hearth a step of recovering the generated coal dust; (the step of carrying back the (four) coal dust I on the above-mentioned mobile hearth; and supplying heat from the hearth, and obtaining the coal dust generated by the above-mentioned hearth moving furnace [14] The method for producing reduced iron according to the item [1], wherein the method of producing reduced iron is further included in the step of melting the above-mentioned reduced product: 3⁄4. The method for producing reduced iron according to the item [1], further comprising: The original product, the melting step of the melting; the above mixed raw material contains: iron complex), carbon-based solid reducing material, and 098113608 7 201000640 slag forming material; the iron ore (X) contains high zinc iron ore (A) [16] The method for producing reduced iron according to the item [14], wherein the melting step is such that the molten iron ore (A) contains a remark of 〇 s s 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 ' The method for producing reduced iron according to the above aspect, wherein the heating temperature is 145 (TC or more and 1500 or less). The method for producing reduced iron according to the above aspect, further comprising: a melting step of melting the reduced product; and recovering coarseness from coal dust generated by the hearth moving furnace The step of recovering zinc oxide; the step of preparing the raw material is to prepare a mixed raw material containing iron ore, zinc-containing coal dust, carbon-based solid reducing material, and slag-forming material; the iron ore (χ) system contains a high-word Iron ore (Α), which contains high zinc iron ore (Α) containing zinc 〇〇lmass% [19] The method for producing reduced iron according to the item [18], wherein the mixed raw material has an average concentration of 〇.45 mass% or more. [20] . The method for producing reduced iron according to the above aspect, wherein the above-mentioned average concentration is 0.45 to 0.60 mass%. [21] The method for producing reduced iron according to the item [18], wherein the zinc-containing coal dust is derived from Coal dust from the blast furnace, coal dust from the converter, and coal gangue from 098,113,608 to 20,1000,640. Among them, more advanced - from the electric charge (4) to form a group of wealth selection at least [22]. As described in [1], the method for producing reduced iron, the steps include: a step of melting the reduction product; The methane generated by the m wood mobile furnace is recovered, and the recycled medium deer step is obtained; the dust is returned to the above-mentioned step of preparing the raw materials, and the mixed raw materials containing the iron ore (8), the dust, the carbon-based solid reducing material, and the slag-forming material are prepared. : The medium contains high-zinc iron ore (8), and the high-grade iron ore (A) system:: (x) O. Olmass% or more, and iron noodles. [23] The method for producing reduced iron according to the item [1], wherein the step comprises: a step of melting the molten product by Shi Jinyi; and a step of recovering the coal dust generated by the hearth moving furnace (Step of loading the coal dust at the time on the above-mentioned mobile hearth;: Performing the heat supply from the hearth, and obtaining the crude oxidation word from the coal dust moving and formed by the hearth. [24] The method for producing reduced iron according to [1], wherein before the step of loading the mixed raw material, the method further comprises: laminating the mixed raw material for the carbon material loaded on the mobile = above And the carbon material loading step of the carbon f #^ bed type hearth.; private movement [embodiment] 098113608 9 201000640 Embodiment 1: The method for manufacturing the reduced iron of the state 1 includes: a step of preparing a mixed raw material, a mixed raw material loading step, a reducing step, and a melting step. The step of preparing the mixed raw material is prepared to prepare iron ore (which contains high zinc iron ore; the high zinc iron ore containing: zinc 001mass% a mixed raw material in which a carbon-based solid reducing material and a slag-forming material are mixed. The mixed raw material loading step is performed by loading the mixed raw material on a movable hearth. The reducing step is performed from the hearth. The supply of the mixed raw material loaded on the mobile hearth is reduced. The melting step is to melt the reduced product. The inventors used a high-zinc iron ore to effectively utilize the iron and zinc damage contained therein. It is considered to use a hearth mobile furnace. The method for producing a granular iron using a hearth moving furnace is one of the processes for producing reduced iron, and the furnace bed moving in the horizontal direction is loaded with iron ore and solid reducing materials. And performing heat transfer from above to perform heat transfer, the iron ore is reduced, and the reduced product is condensed on the hearth to separate the smash from the metal, thereby producing granulated iron belonging to reduced iron. The mobile furnace is a furnace that is heated during the horizontal movement of the hearth of the heating furnace. The so-called "hearth moving horizontally" is representative of a rotational movement pattern as shown in FIG. A hearth moving furnace with a rotating and moving form, especially called a "rotary hearth furnace". In the implementation of the miscellaneous!, the use of such a hearth mobile furnace (especially a converter) Iron ore 098113608 10 201000640 Reduction and smelting treatment to obtain granulated iron of reduced iron. Hereinafter, a case where a rotary kiln is used for a hearth moving furnace will be described in the first embodiment. The so-called "including high iron ore" used is higher in zinc content than iron ore normally used as raw material for blast furnaces, and generally belongs to zinc O.Olmass% or more and iron 50 mass%/〇. Iron ore. The upper limit of zinc content and iron content of high-zinc-containing ore used in the first embodiment is not limited. 'Because it belongs to iron ore, it is determined by itself. The relevant zinc system is, for example, 〇5mass% (less than the degree, related iron system, for example, 70mass%) Below the level. In addition, the content of an alkali component such as NkO or Re containing a high iron ore is usually 0.08 mass% or more in terms of an oxide. The alkali component content is preferably lmass% or less for the purpose of effectively preventing clogging of the converter exhaust system. In the first embodiment, the technique for producing granulated iron using such high-zinc-iron ore is used. When the high-zinc-containing iron ore is reduced by a rotary kiln, it can be mixed with ordinary iron ore. In the case of mixing ordinary iron ore, it is also a high-zinc iron ore = blending: When the ore is about 10 〇 maSS% or more, the effect of the embodiment can be appropriately obtained. An embodiment of a rotary kiln used in the first embodiment will be described with reference to Fig. 1 . As shown in Fig. 1, the rotary kiln 1 is covered with a rotary &amplified hearth 3 by means of a furnace body 2 which is divided into a pre-tropical zone 2& reduction zone 2b, a melting zone 2c and a cooling zone 2d. On the rotary hearth 3, for example, a raw material 4 composed of a high-zinc-iron ore and a solid reducing material is placed. The raw material 4 is a mixed raw material which is obtained by mixing a high-zinc iron ore anti-reinforcing material and a slag-forming material. 098113608 11 201000640 / 2 ★ The following can also be used to form a block. The furnace body covering the rotary hearth 3 is refractory. And to protect the hearth refractory, there is also a sinking in the hearth 3, and on the upper layer of the raw material 4 of the area. Further, in the furnace L, =: a, the burner 5' is set to treat the fuel combustion heat of the burner 5 as: iron ore reduction in the mixed raw material 4 on the rotary hearth 3. Further, in Fig. 1, '6 is a loading device for loading a raw material into a rotary hearth 3±, and is a discharge device for discharging the reduced product, and an 8-series cooling device. Further, the ambient temperature in the furnace body 2 is set to the left and right 'normally controlled to a high temperature of about 5% in the melting zone. The expansion of high-zinc-containing irons varies according to the amount of origin. Further, ash is contained in coal gangue and coal yoke which are representative examples of carbon-based solid reducing materials. Therefore, the furnace moving furnace method in which only the reduction operation is performed: the carbon is the same as the furnace and the converter method. The mixing of the gangue in the finished reduced iron is inevitable, and the ash from the reducing material is also attached to the finished product. And now 2 possibilities. When the raw material is subjected to reduction and melting in the hearth of the rotary chamber furnace, the metal formed in the fly=reduction is rapidly separated from the residual residue, and the finished granular iron can be obtained. The X-shaped form of the obtained granular iron is as described above, and is subjected to reduction and dissolution to cause separation and separation, and then the effluent from the converter is subjected to compression, etc., and the apparent density is up to 5 the above. Further, the finished granular iron can be formed into a three-axis or more and a size of 100 mm or less by a sieving step.上, 098113608 12 201000640 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转 转The carbon-based solid reducing material is such as coal, coke, graphite, etc.: the furnace material such as lime powder, dolomite, serpentine, etc. contains (5), an inspective component, and the like. 2〇, etc.

當含高辞鐵礦係礦石塊的情況，在施行粉碎的情况下，〆 ❹J如粒徑1Gmm以下的礦石粉，因此與碳系固態還原材= 等進行混合並裝載於旋轉爐床上便可進行還原。 邛 含高鋅鐵礦係微粉礦的情況(粒徑3mm以下），亦可與石山 系固態還原材料、造渣材料—起施行成塊化，而依内含碳^ 材顆粒的形式使用。經成塊化的原料在加熱時的飛散情^交 少，可提升煤塵的鋅濃度。同樣的，亦可施行壓縮成形，麫 壓塊後再使用。此外，在造粒時，亦可混合入諸如膨潤土等 無機黏結劑、或諸如糖蜜、玉米澱粉(m〇lasses)等有機黏結 劑，便可更加提咼強度。該等顆粒、壓塊係可經使水分蒸發 後才使用。另一方面，含高鋅鐵礦直接依粉狀狀態使用亦具 有效果。藉由直接使用粉原料，便不需要為製造塊用的設 備、電力、黏結劑等耗費，對經濟性提升具貢獻。 利用轉膛爐對含咼鋅鐵礦施行還原•熔融時的加熱溫度， 較佳係1400 C以上。更佳145〇。(：以上。藉由將轉膛爐内的 最高溫度設為1450°C以上，爐内及在爐内進行還原•熔融 的原料便呈高溫。特別係藉由熔融原料達145〇。〇以上，便 098113608 13 201000640 可確保充分地流動性，可輕易地將金屬鐵中的脈石成分^ 去，可製造良好性狀的粒鐵。 藉由在爐床上裝載碳質材，並在該礙質材上積層著含有人 高鋅鐵礦的混合原料，便可防止溶融金屬或炫逢對濟床的而才 火物造成侵餘。當耐火物遭受侵飯時，鐵份會被吸入耐火物 中’因而藉由防止爐床耐火物遭受侵蝕，便可減少鐵份的損 耗，對粒鐵的生產性提升具有貢獻。 轉膛爐中所生成排氣中含有的煤塵被回收。該煤塵相較於 高鋅鐵礦之下，因為鋅較濃化，因而可使用為粗氧化鋅的原 料。圖2所示係施行此種煤塵回收的轉膛爐一般設備流程概 略圖。 圖2中，分別從礦石漏斗U、煤炭漏斗12、及造渣材料 漏斗13中排出的鐵礦、煤炭、造渣材料，將利用混合機 14 (視需要使用造粒機等）進行混合而形成混合原料，利用轉 膛爐15施行加熱經還原•熔融而形成還原鐵，再從還原鐵 排出口 16排出。由轉膛爐15所生成的排氣將利用抽風扇 19進仃抽吸並從煙囪20排出，此時，將利用排氣管用濾袋 集塵益、17執行煤塵回收。所回收的煤塵將使用粉體搬送用 運料車18等搬出。在混合原料中，當含高鋅鐵礦係調配礦 石整體約lOmass%以上時’便可使所回收煤塵中的鋅濃度形 成lmass%以上。 依如上述，從由轉膛爐所生成排氣中回收的煤塵（以下稱 098113608 14 201000640 「第1回收煤塵」），將再度於轉腔爐中，從爐床上部進行 熱供應並施行處理，在將轉膛爐所生成的煤塵回收，便可猙 得粗氧化鋅。在將該第i回收煤塵再度利用轉腔爐施行處= 時，將回收所生成煤塵的物質，以下稱「第2回收煤塵。 將弟1回收煤塵利用轉腫爐施行處理時，只要對第1回 塵施行處理便可，但就從促進還原反應的觀點，亦可在少量 (相對於第1回收煤塵在2mass%以下）第i回收煤塵中混: f 入碳系固態還原材料或造渣材料。依此的話，藉由將煤塵再 度利用轉膛爐施行煉製，便如下述，可將第1回收煤塵中的 鋅濃縮。當第〗回收煤塵中的鋅濃度達既定量以上時，在第 1回收煤塵中混合入碳系固態還原材料、造渣材料及鐵確， 亦可增加粒鐵製造量。當在第1回收煤塵中混合入鐵礦並施 行處理時，若與第2回收煤塵中的目標鋅濃度相同，則若使 用含高鋅鐵礦便可增加鐵礦調配量，因而玎一邊進行煤塵中 I 的鋅濃縮’ 一邊製造更多量粒鐵，故屬較佳。 煤塵中的鋅濃縮係如圖3所示’將煤慶場23的第1 煤塵使用粉體搬送用運料車18等進行搬送，並利甩轉腔姨 15施行加熱，且抽吸所生成的排氣，再利用排氣管用濾袋 集塵為17施行煤塵回收便可實施。或，如圖4所示，# ' 精由 與混合原料的漏斗11〜13並排設置第丨回收煤塵儲存漏斗 22便可實施。此設備係相對於圖2所示設備，追加回收煤 塵搬送輪送帶21與第1回收煤塵儲存漏斗22。回收煤塵搬 098113608 15 201000640 係分枝為一，利用第〜 輸达π a將第！回收煤塵搬送入第）回收煤塵儲/ 22中再利用轉膛爐15施行加熱而再利用，並利用^斗 收煤塵搬送輪择恶^ k & 回 定輸送f 2ib將第2回收煤塵依產品 所抽取出的第2 Θ你杖旌& s 、裀取出。 口收媒塵係屬於微粉，目錢帛 送用運料車18等進行搬送。 知极椒 當在煤獅混合入鐵鑛時，將第〗回收煤塵儲存於第 回收煤塵儲存漏斗22中，驻士唯 省存於卓】 刼H杰4; 猎由凋配入少量的碳系固態還 ” U料、及鐵礦’便可使用為轉膛爐的原料，〜: 用轉脸爐】5施行加熱而進行還原· :你 煤塵的形式回收。 τ㈣弟2回收 如前述，含有粗氧化鋅的第2回收煤塵係配合辞濃 不同的使用用途，但依上述方法所生產的第2回收煤塵，= 為鋅濃度超過1〇_S%，因而可利用諸如華爾滋法等中間處 理形成高濃度的粗氧化鋅’可使用為鋅煉製原料。 回收第1回收煤塵時的、思合原料，即使礦石全部均非屬含 南鋅之礦石的情況’若鑛石中的平均辞濃度達纏職％ 以上’便可使、__處理而獲得第2回收煤塵的辞濃度達 50麵s%以上。麵獲得回㈣塵的辞濃度達伽ass%以 上，便不需要中間處理，可直接使用為鋅精煉所使用的粗氧 化鋅，因而屬較佳。 如上述，針對回收煤塵（第] 收煤塵）藉由利用轉膛爐再 098113608 16 201000640 度施行處理，便可提升回收煤塵（第2回收㈣）中的辞濃 度，且經濟性亦提升。除此之外，具有不需要設置為施行煤 塵處理的其體備（中間處理設備)之設置成本，且亦不需要 將所生成煤塵搬送至中間處理設備處的搬送成本之優點。 上述中’將㈣_所生朗氣巾含㈣煤塵回收並使 用’但亦有將除回㈣塵以外的含鋅職，在將含高辞鐵礦 利用轉輯前還敎際便齡人使肖。藉由混合人辞濃度In the case of the ore-bearing ore block, in the case of pulverization, 〆❹J, such as ore powder having a particle size of 1 Gmm or less, is mixed with a carbon-based solid reduction material = and loaded on a rotary hearth. reduction.情况 In the case of high-zinc-iron ore fine powder ore (particle size of 3 mm or less), it can also be used in the form of agglomerated solid-state reducing materials and slag-forming materials, and used in the form of particles containing carbonaceous materials. The bulking of the raw materials in the heating can reduce the zinc concentration of the coal dust. Similarly, compression molding can be performed, and the block can be used after being pressed. Further, in the case of granulation, an inorganic binder such as bentonite or an organic binder such as molasses or corn starch may be mixed to further enhance the strength. The granules and briquettes can be used after evaporating the water. On the other hand, the use of high-zinc-iron ore directly in the form of a powder is also effective. By directly using the powder raw material, it is not necessary to consume equipment, electricity, and a binder for manufacturing the block, and contributes to economic improvement. The heating temperature at the time of reduction and melting of the cerium-containing zinc-iron ore by a rotary kiln is preferably 1400 C or more. Better 145〇. (: Above. By setting the maximum temperature in the converter to 1450 ° C or higher, the raw materials in the furnace and in the furnace are heated and melted at a high temperature, especially by melting the raw material up to 145 〇. 098113608 13 201000640 ensures sufficient fluidity, can easily remove the gangue components in the metal iron, and can produce ferrite with good properties. By loading carbon material on the hearth, and on the material With a mixture of raw materials containing human high-zinc-iron ore, it can prevent the molten metal or the smoldering of the smoldering material. When the refractory is invaded, the iron will be inhaled into the refractory. By preventing the erosion of the refractory of the hearth, the loss of iron can be reduced, and the productivity of the granular iron is contributed. The coal dust contained in the exhaust gas generated in the converter is recovered. The coal dust is higher than the high zinc iron. Under the mine, because zinc is concentrated, it can be used as raw material for crude zinc oxide. Figure 2 shows a schematic diagram of the general equipment flow of the converter for performing such coal dust recovery. In Figure 2, from the ore funnel U, Coal funnel 12, and slag The iron ore, coal, and slag-forming material discharged from the hopper 13 are mixed by a mixer 14 (using a granulator or the like as needed) to form a mixed raw material, and heated and reduced by melting in a rotary kiln 15 to form reduced iron. Then, it is discharged from the reduced iron discharge port 16. The exhaust gas generated by the rotary kiln 15 is sucked by the exhaust fan 19 and discharged from the chimney 20, and at this time, the filter bag for the exhaust pipe is used to collect dust, 17 The coal dust is recovered, and the recovered coal dust is carried out by using the powder conveying vehicle 18 or the like. In the mixed raw material, when the high-zinc-iron ore-containing ore is disposed in an amount of more than 10 mass% or more, the recovered coal dust can be recovered. The zinc concentration is lmass% or more. As described above, the coal dust recovered from the exhaust gas generated by the converter (hereinafter referred to as 098113608 14 201000640 "the first recovered coal dust") will be re-introduced from the furnace chamber from the hearth. The heat supply is carried out and treated, and the coal dust generated in the converter is recovered, and the crude zinc oxide is obtained. When the i-th recovered coal dust is reused in the operation of the rotary furnace, the generated coal dust is recovered. ,the following It is called "the second recovery of coal dust. When the treatment of the recovery of the coal dust by the younger brother 1 is carried out by the rotary furnace, the first dust can be treated. However, from the viewpoint of promoting the reduction reaction, it can be used in a small amount (relative to the first recovery). Coal dust is less than 2 mass%) The i-recycled coal dust is mixed: f is a carbon-based solid reducing material or a slag-forming material. In this case, the coal dust is re-refined by using a rotary kiln, as shown below. The concentration of zinc in the coal dust is recovered. When the concentration of zinc in the recovered coal dust is more than the above quantitative amount, the carbon-based solid reducing material, the slag-forming material and the iron are mixed in the first recovered coal dust, and the amount of the granular iron can be increased. When the iron ore is mixed and treated in the first recovered coal dust, if the target zinc concentration in the second recovered coal dust is the same, if the high-zinc iron ore is used, the iron ore blending amount can be increased, so that the iron ore blending amount is increased. Zinc concentration of I in coal dust is preferred because it produces more iron. As shown in Fig. 3, the zinc concentrating in the coal dust is carried out by using the first coal dust of the coal field 23 to be transported by the powder transporting vehicle 18, and the heating is performed by the rotating bowl 姨15, and the suction is generated. Exhaust gas can be carried out by using the filter bag dust collection for the exhaust pipe to perform coal dust recovery. Alternatively, as shown in Fig. 4, it can be carried out by arranging the ninth recovery coal dust storage funnel 22 side by side with the funnels 11 to 13 of the mixed raw materials. This apparatus is additionally provided with respect to the apparatus shown in Fig. 2, in which the coal dust transfer belt 21 and the first recovered coal dust storage funnel 22 are additionally recovered. Recycling coal dust 098113608 15 201000640 The branch is one, using the first ~ lose π a will be the first! The recovered coal dust is transported into the first) recovered coal dust storage / 22 and reused in the converter 15 for heating and reuse, and the use of the bucket to collect the dust transfer wheel to select the evil ^ k & the return transport f 2ib to the second recovered coal dust according to the product The second 抽取 Θ Θ 旌 旌 amp 茵 茵 茵 茵 茵 茵 茵 茵 茵 茵 茵 茵 茵 茵The mouth-collecting medium dust is a micro-powder, and the target money is sent to the transport vehicle 18 for transport. When the coal lion is mixed into the iron ore, the first recovered coal dust is stored in the recovered coal dust storage funnel 22, and the resident is only in the province. 刼H Jie 4; hunting is mixed with a small amount of carbon The solid state also "U material, and iron ore" can be used as a raw material for the converter, ~: Use the face furnace] 5 to perform heating to reduce ·: Recycling in the form of coal dust. τ (four) brother 2 recovery as mentioned above, contains coarse The second recovered coal dust of zinc oxide is used for different purposes, but the second recovered coal dust produced by the above method has a zinc concentration of more than 1〇_S%, and thus intermediate treatment such as Waltz method can be utilized. The formation of high-concentration crude zinc oxide can be used as a raw material for zinc refining. The raw material for the first recovery of coal dust is recovered, even if the ore is not all of the ore containing zinc. 'If the average concentration in the ore is If you get more than % of the work, you can get the second recovered coal dust with a concentration of 50% s% or more. If you get back to the (4) dust, the concentration of the dust is more than sass%, so you don't need intermediate treatment. Direct use of the crude zinc oxide used for zinc refining As described above, the recovery of coal dust (the first collection of coal dust) can be improved by recycling the coal dust (the second recovery (4)) by using the rotary kiln at 098113608 16 201000640 degrees, and the economy is also improved. In addition, there is an installation cost of the body preparation (intermediate processing equipment) that does not need to be disposed to perform the coal dust treatment, and there is no need to carry out the transportation cost of the generated coal dust to the intermediate processing equipment. _ The raw air towel contains (4) coal dust recovery and use 'but there will be a zinc-containing job that will be removed (four) dust, before the use of the high iron ore mine will be used. Human concentration

較高於含高鋅鐵礦的煤塵，便如上述，從由職爐所生成排 氣中回收的煤塵’便可獲得具有高濃度粗氧化鋅的煤塵。 如别述’含有粗氧化鋅的回收煤塵係配合辞濃度而有不同 的使用用途，但不管自家產生、或外部產生，使用含鋅煤塵 所生產的时職均可達鋅濃度超過1Gmass%，因而利用諸 如華爾滋法等中間處理便可形成高濃度的粗氧化鋅，可使用 為鋅煉製原料。 與含高鋅鐵礦混合使用的含㈣塵並錢別的限制，可使 用例如來自高爐的生成煤塵、來自轉爐的生成煤 爐的生成煤塵等鋼鐵業的煤塵等。 迅 右混合原料中的平均鋅滚度達〇 45 — %以上 轉=盧施行處賴獲得回收煤塵的鋅濃度達⑽咖％以 上右所獲得回收煤塵的鋅濃度達50mass%以上，便0 2門處理’可直接使用為鋅精煉所用的粗氧化鋅，因而屬較 098113608 17 201000640 依如上述，當將含高鋅鐵礦利用轉膛爐進行還原時，藉由 混合入含鋅煤塵使用，便可提升回收煤塵中的鋅濃度，且亦 提升經濟性。 以下，針對本發明一實施形態進行詳細說明。 在轉膛爐的爐床上裝載著含有：含高鋅鐵礦、碳系固態還 原材料、及造渣材料的混合原料，—邊使爐床進行旋轉而使 爐内移動-邊施行升溫加熱，並將空氣錢加氧的空氣吹入 爐内，使利用還原反應所生成的c〇或Hz進行2次燃燒。 所生成的排氣經冷卻後，便將排氣中所含有的煤塵回收。 另一方面，使爐床上所殘存的混合原料完全熔融而形成液體 之後，經冷卻、固化，便獲得渣鐵分離的粒鐵。藉由在移動 的爐床上進行加熱，便可具有下述效果： )廣石中的氧化鐵與碳系固態還原材料中的碳產生反應 而形成金屬鐵； 〜 b)鐵知係利用滲碳反應㈣伽出㈣代⑽ 一―等)與諸如石灰粉、白雲石：= CaO、Na2Q等鹼性成分進行混合，而降低魅並炫融； 、c)藉由保持—定期間熔融狀態，便可獲得分離為炫融金屬 鐵。卩刀（金屬）與炫融脈石份(溶邊）的效果； 可製得與生鐵同樣能使用屬於還原鐵的粒鐵。 另一方面’石廣叾巾的辞份係依氧化鋅形式存在，利用碳系 固態還原材料進行還原揮發並被搬送於排氣中，在冷卻之同 098113608 201000640 時亦進行氡化凝聚’而㈣氣中分離出，並被當作煤塵回 收。該煤塵騎經濃化，直減經再精製步雜成為辞煉製 的原料。 因為轉膛爐係未具有填充層的爐’因而不會有如高爐中所 出現’因原騎含有的鋅份_於爐壁上，導齡炭或鑛石 出現黏著、填充物呈鈍態化等現象發生，不會出現操作障礙 情況。 轉膛爐加熱時鋅成分會揮發，在被搬送入排氣中之同時， 爐床上所裝載的混合原料其中-部分飛散，而混合於回收煤 塵中。所以，时煤射的誠錢域所揮發的鋅份量與 飛散的混合原料量而決定’混合原料中的鋅濃度越高，則所 回收煤塵的鋅濃度越高。根據本發明者等的研究，確認到混 合原料的飛散量在通常操作中幾乎呈—定’屬於混合原料投 入量的 0.5mass%左右。且，煤塵中的鋅濃度越高，鋅原料 的價值越高。所以，藉由實施本發明，便可回收鋅濃度較高 的煤塵，俾可更有效地利用含高鋅鐵礦。 再者，藉由轉腫爐上所裝載混合原料的全部或其中一部分 係使用所回收的煤塵’則亦可將上述辞濃度較高的煤塵中之 鋅更進一步濃縮並回收。 η [實施例1] 098113608 19 201000640 鐵的製造試驗。此外，亦將由轉膛爐所生成的煤塵回收並施 行鋅濃度測定。轉膛爐的規格係如表1所示。此外，表2 中，「T-Fe」係指總計Fe。 [表1]Higher than the coal dust containing high zinc iron ore, as described above, coal dust having a high concentration of crude zinc oxide can be obtained from the coal dust recovered from the exhaust gas generated by the furnace. As mentioned above, the recovered coal dust containing crude zinc oxide has different use purposes, but whether it is produced by itself or externally produced, the zinc concentration produced by using zinc-containing coal dust can reach a zinc concentration of more than 1 Gmass%. A high concentration of crude zinc oxide can be formed by an intermediate treatment such as the waltz method, and it can be used as a raw material for zinc refining. In addition to the limitation of (4) dust containing high-zinc iron ore, it is possible to use, for example, coal dust generated from a blast furnace, coal dust generated from a coal-fired furnace from a converter, and coal dust generated from a coal-fired furnace. The average zinc rolling degree in the right-mixed raw material reaches —45-% or more = Lu Shixing relies on the zinc concentration of the recovered coal dust to reach (10)% or more, and the zinc concentration of the recovered coal dust obtained by the right is more than 50 mass%, then 0 2 The treatment can be directly used as the crude zinc oxide used for zinc refining, so it is more than 098113608 17 201000640. As described above, when the high-zinc-containing iron ore is reduced by using a rotary kiln, by mixing into the zinc-containing coal dust, it can be used. Improve the concentration of zinc in the recovered coal dust, and also improve the economy. Hereinafter, an embodiment of the present invention will be described in detail. On the hearth of the rotary kiln, a mixed raw material containing: high-zinc iron ore, a carbon-based solid reducing material, and a slag-forming material is loaded, and while the hearth is rotated to move the furnace, heating is performed while heating The air-oxygenated air is blown into the furnace to cause two combustions by c〇 or Hz generated by the reduction reaction. After the generated exhaust gas is cooled, the coal dust contained in the exhaust gas is recovered. On the other hand, the mixed raw material remaining on the hearth is completely melted to form a liquid, and then cooled and solidified to obtain granulated iron separated by slag iron. By heating on a moving hearth, the following effects can be obtained:) Iron oxide in the feldspar reacts with carbon in the carbon-based solid reducing material to form metallic iron; ~ b) Iron knows to utilize carburizing reaction (4) Gamma (four) generation (10) one-etc. is mixed with alkaline components such as lime powder, dolomite: = CaO, Na2Q, etc., to reduce charm and smelt; c) by maintaining the molten state during the period Separated into smelting metal iron. The effect of the trowel (metal) and the fused gangue (dissolved edge); the granulated iron belonging to the reduced iron can be produced similarly to the pig iron. On the other hand, the remarks of 'Shiguang's towel are in the form of zinc oxide, which is reduced and volatilized by a carbon-based solid reducing material and transported to the exhaust gas. When cooled, the same as 098113608 201000640, it is also condensed and aggregated. It is separated and recovered as coal dust. The coal dust is concentrated by the concentration, and the refining step is reduced to become the raw material of the refining system. Because the converter system does not have a furnace with a filling layer, it does not appear as in the blast furnace. Because of the zinc content contained in the original riding _ on the furnace wall, the ageing charcoal or ore is stuck and the filling is passive. Occurs, there will be no operational obstacles. When the rotary kiln is heated, the zinc component volatilizes, and while being transported into the exhaust gas, the mixed raw materials loaded on the hearth are partially scattered and mixed in the recovered coal dust. Therefore, the amount of zinc volatilized in the real money field of the coal shot is determined by the amount of the mixed raw material. The higher the zinc concentration in the mixed raw material, the higher the zinc concentration of the recovered coal dust. According to the study by the inventors of the present invention, it has been confirmed that the amount of scattering of the mixed raw material is almost constant at about 0.5 mass% of the mixed raw material input amount in the normal operation. Moreover, the higher the zinc concentration in the coal dust, the higher the value of the zinc material. Therefore, by implementing the present invention, coal dust having a high zinc concentration can be recovered, and the high-zinc iron ore can be utilized more effectively. Further, the zinc in the coal dust having a higher concentration can be further concentrated and recovered by using the recovered coal dust in all or part of the mixed raw materials loaded on the rotary furnace. η [Example 1] 098113608 19 201000640 Iron production test. In addition, the coal dust generated by the converter is recovered and the zinc concentration is measured. The specifications of the converter are shown in Table 1. In addition, in Table 2, "T-Fe" means total Fe. [Table 1]

爐中心直徑 7m 爐寬 lm 加熱溫度 1300〜1500〇C 所使用礦石的組成係如表2所示。 [表2] (mass%) T-Fe FeO Si02 ai2o3 Zn 礦石A 63.0 23.2 4.28 1.13 0.050 礦石B 64.0 22.3 4.1 1.00 0.001 礦石A係含高鋅鐵礦，礦石B係鋅含有量較低的一般礦 石。雖脈石份及鐵份二者大致相同，但礦石A的鋅濃度為 礦石B的約50倍左右。 將礦石、碳糸固悲逛原材料的煤厌、及造〉查材料的石灰進 行混合而形成混合原料。表3所示係所使用煤炭的組成，表 4所示係試驗所使用混合原料的調配。此外，表3中，FC 係指固定碳，VM係指揮發份，Ash係指灰分。 [表3] (mass%) FC VM Ash Si02 ai2o3 煤炭 85 7 8 4.5 2.5 098113608 20 201000640 [表4] (kg/t-iron) 礦石A 礦石B 煤炭 石灰 調配1 — 1562 344 171 調配2 1587 — 343 179 調配3 145 1420 345 171 使用表4所示調配1〜3，依照表5所示條件進行轉膛爐的 操作。在爐床上將碳質材的煤炭錄設層厚50mm，並在其上 面積層混合原料，將此情況設為「有下層碳質材」，且將混 合原料係在未成塊化下裝載呈層厚約10mm使用的情況記 為「粉」，將經成塊化而形成粒徑10〜15mm顆粒的情況記為 「塊」，並標示於原料狀態攔位中。 [表5] 操作No. 溫度（°C) 調配 下層碳質材 原料狀態 備註 1 1400 1 無 粉 比較例 2 1460 1 無 粉 比較例 3 1400 2 無 粉 本發明例 4 1400 3 無 粉 本發明例 5 1460 2 無 粉 本發明例 6 1460 2 有 粉 本發明例 7 1460 2 無 塊 本發明例 表6所示係依照表5所示條件進行粒鐵製造時，煤塵鋅濃 度與鐵份回收率的結果。 098113608 21 201000640 [表6] 操作No. 煤塵鋅濃度 鐵份回收率 處理時間 備註 1 0.20% 97.0% 14分 比較例 2 0.19% 97.0% 13分 比較例 3 7.8% 97.0% 13.5 分 本發明例 4 1.0% 97.0% 13.5 分 本發明例 5 8.1% 98.0% 13分 本發明例 6 7.9% 99.0% 12分 本發明例 7 9.6% 99.5% 12分 本發明例 表6中，操作No.3係使用含高鋅之礦石的本發明例。煤 塵中的鋅濃度上升至7.8mass°/〇。 操作No.4係在一般礦石中調配入約lOmass%含高鋅鐵礦 的情況例。此情況亦是煤塵中的鋅濃度上升至l.Omass%以 上。 操作No.5係經1450°C以上的高溫施行加熱處理，得知處 理時間縮短，生產性提升。 操作No.6係除操作No.5之外，尚在爐床上鋪設碳質材， 並在其上積層著混合原料的情況，鐵份回收率上升。 操作No.7係除操作No.5之外，尚使用塊原料的情況，煤 塵中的鋅濃度上升。 其次，施行所回收煤塵的再生利用。 利用如同圖1、圖4所示的相同設備，使用含高鋅鐵礦、 及鋅含有量較低的一般鐵礦，施行粒鐵製造試驗時，調查鐵 礦的辞濃度、與所回收煤塵的鋅濃度間之關係。調查時係將 098113608 22 201000640 含高辞鐵礦的礦石A、與普通鐵礦的礦石B進行混合使用， 使鋅濃度連續變化而分設為操作No.11〜19，將第1次利用 轉膛爐施行處理所生成煤塵（第1回收煤塵）回收，針對所回 收的煤塵全量利用轉膛爐依1460°C施行13分鐘的加熱處 理，並將所生成的煤塵（第2回收煤塵）回收。 表7及圖5所示係混合原料中的礦石鋅濃度、與第1次利 用轉膛爐施行處理所生成的煤塵，成為第2次利用轉膛爐施 行處理的原料之第1回收煤塵的鋅濃度測定結果、與最終成 品煤塵的第2回收煤塵之鋅濃度測定結果。 由表7及圖5中得知，混合原料中的礦石鋅濃度若達 0.005mass%以上，成品煤塵的第2回收煤塵鋅濃度便超過 50mass%，可直接使用為ISP法等鋅精煉的原料。 [表7] 操作No. 礦石A _配比 鋅濃度 第2次回 收煤塵原 單位 備註 混合原 料礦石 第1次回 收煤塵 第2次回 收煤塵 mass% mass% mass% mass% kg/t-Fe 11 0.0 0.001 0.16 23 0.067 比較例 12 3.0 0.002 0.41 41 0.096 本發明例 13 5.0 0.003 0.57 47 0.116 本發明例 14 6.0 0.004 0.65 50 0.125 本發明例 15 7.5 0.005 0.77 53 0.140 本發明例 16 8.0 0.005 0.81 54 0.145 本發明例 17 10 0.006 0.97 57 0.164 本發明例 18 15 0.008 1.36 62 0.213 本發明例 19 20 0.011 1.76 66 0.261 本發明例 098113608 23 201000640 其次，使用含高鋅鐵礦與含鋅煤塵相混合的原料。 所使用含鋅煤塵的組成係如表8所示。在此，含鋅煤塵係 使用來自轉爐的生成煤塵。 [表8] T-Fe FeO Si〇2 ai2o3 Zn 含鋅煤塵 48 16.29 1.49 1.17 1.4 利用如同圖1所示的相同設備，使用含高鋅鐵礦及含鋅煤 塵，施行粒鐵製造試驗時，調查混合原料中的鋅濃度、與所 回收煤塵的鋅濃度間之關係。調查時係使用將含高鋅鐵礦的 礦石A與含鋅煤塵相混合，並使鋅濃度連續變化而分設為 操作No.21〜25，混合原料係利用轉膛爐依1460°C施行13 分鐘的加熱處理，並將所生成的煤塵回收。 表9所示係混合原料中的含鋅煤塵調配比率、與鋅濃度、 及回收煤塵的鋅濃度之測定結果。 [表9] 操作No. 含鋅煤塵調配比 辞濃度 備註 混合原料 回收煤塵 mass% mass% mass% 21 0 0.04 8 本發明例 22 10 0.17 28 本發明例 23 20 0.31 41 本發明例 24 30 0.45 50 本發明例 25 35 0.51 53 本發明例 由表9中得知，隨混合原料中的含鋅煤塵調配比率上升， 098113608 24 201000640 回收煤塵的鋅濃度亦隨之上升，若混合原料中的鋅濃度達 O.Cmass%以上，屬於成品煤塵的回收煤塵鋅濃度會超過 50mass%，可成為isp法等辞精煉能直接使用的原料。 實施形態2 : 實施形態2的還原鐵之製造方法，係包括有：準備混合原 料的步驟、混合原料裝載步驟、及還原步驟。 山準備混合原料的步驟係準備將含有含高鋅鐵礦的鐵礦、與 碳系固態還原材料相混合的混合原料，該含高辞鐵礦係含有 辞O.Olmass。/。以上、鐵5〇mass%以上。混合原料裂载步驟係 使上述混合㈣裝載於移動式爐床上。縣步驟係從爐床上 部進订熱供應，而將移動式爐床上所裝載的混合原料還原， 並使上述混合騎树融或僅其巾—部分㈣，而獲得還原 鐵。 、 本發明者等係使用含高鋅鐵確，為能有效利用所含有的鐵 份與鋅份，便考慮使用爐床移動式爐。使賤床移動式爐的 還原鐵之製造方法，係製造還原鐵的製程之一，在朝水^方 向移動的爐床，裝載著鐵礦與固態還原材料等，並從1方= 仃輻射傳熱而施行加熱，便將鐵礦還原而製造還原鐵。、 該爐床移動式爐係在加熱爐的爐床朝水平移動過程中施 行加熱的爐’所謂「朝水平移動的爐床 ⑪ 所千# # 表性係有如圖6 ^職轉移動形態，此形態的爐床移動式__為 098113608 爐」。實施形態2中，使用此種爐床移動式爐(特別係轉腔 25 201000640 爐），對含高鋅鐵礦施行還原而製造還原鐵。以下，針對爐 床移動式爐係使用轉膛爐的情況’依實施形態2進行說明。 另外，實施形態2所使用所謂「含高鋅鐵礦」，相較於通 常利用為高爐原料的鐵礦之下，屬鋅含有量較高，一般係屬 於含有鋅0.01mass%以上、鐵50mass°/〇以上的鐵礦。實施形 態2所使用含高鋅鐵礦的鋅含量及鐵含量上限並無限制，因 為屬於鐵礦而自行決定’相關鋅係例如〇.5mass%程度以 下、相關鐵係例如70mass%程度以下。此外，含高鋅鐵礦的 Na2〇、K2〇等鹼成分含有量，係依氧化物換算計通常 0.08mass%以上。鹼成分含有量較佳係lmass%以下，理由 係能有效地預防轉膛爐排氣系統阻塞。 實施形態2係使用此種含高鋅鐵礦進行還原鐵製造的技 術，將含高鋅鐵礦利用轉膛爐進行還原時，亦可混合普通鐵 礦使用。混合普通鐵礦使用的情況，亦是含高鋅鐵礦調配入 礦石整體的約l〇mass%以上時，可適當地獲得實施形態2 效果。 使用圖6 ’針對實施形態2所用的轉膛爐—實施形態進 況明。轉腔爐丨係如圖6所示，利用經區分為預熱帶上 還原帶2b、及冷卻帶2d的爐體2，覆蓋著旋轉移動的爐 =二轉爐床3上裝載著例如由含高鋅鐵確與碳㈣ 錢 心混合原料4。混合原料4係如下述亦可施 、土化。覆蓋旋轉爐床3的爐體2係有張貼著耐火物。且 098113608 26 201000640 保護爐床耐火物，亦有在爐床 θ A 上裝载碳質材，並在其上面 積層此合原料4的情況。此外，在 在壚體2的上部設置燃燒器 5，將該燃燒器5的燃料燃燒熱告 〜、、、田作熱源，將旋轉爐床3上 的混合原料4中之鐵礦還原。另 卜’圖6中’ 6係將原料裝 入方疋轉爐床3上的裝入装置，7 笔Q .. . ^ 係將逛原物排出的排出裝 置，8係冷卻裝置。一般爐溫係 ^ B_ 制為13〇〇。〇左右。理由係 有助於爐肢耐火物壽命的延伸。 4.^5, . 本务明並非積極地將混合原 ,, 枓溶融’但在還原過程中將豆中一 ' ^ 。卩份熔融的情況，亦涵蓋 於貫她形態2的範圍内。 含高鋅鐵礦係含有依照產地 八 士冰. 里方面會有差異的脈石成 为。此外，在碳系固態還原材 取 中八古亦八Λ 表例的煤炭、煤焦、焦炭 中3有灰刀。所以，僅施行還 同於高爐-轉濟法，在成口還语作的爐床移動式爐法係不 避免，且亦會有 脈石的情形係無法 Π % 材抖的灰分附著於成品上並混入的 t可此性。所以，實施形態2所獲得還盾》 尚未被#八八# V原鐵係脈石成分、灰分 «未被充刀刀離，因此表觀密 曰谕轩厭# β 1 剛從轉膛爐中排出， 且施订壓等之前的狀態）呈 〆估田喆丄 句3〇0〇kg/m3狀態。 虽使用轉膛爐，對含高鋅鐵石廣 入入#灸'订還原處理時，亦一起混 合入石反糸固態還原材料，並震载 ^ 151能、罗；疋轉移動的爐床上。碳系 固“原材料係諸如煤炭、焦炭、石墨等。 反糸 當含高鋅鐵礦係礦石塊的情況 二 忐例如棱僻τ Λ 靶行粉碎的情況下，形 成例如拉们Gmm以下_石粉 098113608 u此與碳系固態還原材料 27 201000640 等進行混合並裝載於旋轉爐床上便可進行還原。 含面鋅鐵確係微粉礦的情況(粒徑3mni以下），亦可與碳 系固態還原材料一起施行成塊化，而依内含碳質材顆粒的形 式使用。經成塊化的原料在加熱時的飛散情形較少，可提升 煤塵的鋅濃度。同樣的，亦可施行壓縮成形，經壓塊後再使 用。此外’在成塊化時，亦可混合入諸如膨潤土等無機黏結 劑、或諸如糖蜜、玉米殿粉等有機黏结劑，而可更加提高強 度。該等顆粒、壓塊亦可經使水分蒸發後才使用。 另一方面’含高鋅鐵礦直接依粉狀狀態使用亦具有效果。 藉由直接使用粉原料，便不需要為製造塊用的設備費用，亦 不需要為製造塊用所需的電力、黏結劑等耗費，對經濟性提 升具貢獻。 利用轉腔爐對含高鋅鐵礦施行還原時的加熱溫度較佳係 1250 C以上。藉由將轉膛爐内的最高溫度設為125(rc以 上，爐内及在爐内進行還原的原料呈高溫。藉由設定為125〇 °C以上，還原反應變快，俾可高速地製造還原鐵。實施形態 2中，加熱溫度的上限係混合原料尚未完全熔融的溫度（未 滿1450 C) ’在通常的操作中將控制為未滿μ⑽。c。 藉由在爐床上裝載碳質材，並在該碳質材上積層著含有含 高鋅鐵礦的混合原料，便可防止部份溶融的混合原料對爐床 的财火物造成侵# K火物遭受錢時，鐵份會被吸入耐 火物中因而藉由防止爐床耐火物遭受侵I虫，便可減少鐵份 098113608 28 201000640 的損耗，對還原鐵的生產性提升具有貢獻。 轉腔爐中所生成排氣中含有的煤塵被回收。該煤塵相較於 :辞鐵廣之下，因為鋅較濃化，因而可使用為粗氧化辞的原 料圖7所不係施行此種媒塵回收的轉腔爐—般設備流程概 略圖。 圖7中’分別從礦石漏斗n、煤炭漏斗！2中排出的鐵礦、 =炭’利用混合機14(視需要使用造粒機等）進行混合而形成 口 ^料彻轉腔爐15施行加熱經還原而形成還原鐵， 再相原鐵排出σ 16排出。由轉腔爐15所生成的排氣利用 抽風扇19進行抽吸並從煙㈣排出，此時，排氣管用 遽袋集塵It η執行煤塵㈣。所回㈣煤塵係❹粉體搬 1運料18等搬出。在混合原料中，當含高鋅鐵礦係調 配:石整體約1Gmass%以上時，便可使所回收煤塵中的辞濃 度形成lmass%以上。 「似口上述，從由職爐所生成排氣中回收的煤塵（以下稱 弟1回彳«塵」），㈣度於_料 熱供應並施行處理，將職爐所生成_鹿 丁 X的煤塵回收，便可獲得 ::’。在糊1回收煤塵再度利用轉腔爐施行處理 呀’將回收所生成煤塵的物質，以下 將第！回收煤塵利用轉廳施行處理^，^ 2回收煤塵」。 、 /、要對弟1回收煤 塵崎處理便可，但就從促賴原反一_ ” 回收煤塵中少量混合人衫㈣還原#料(相料d回收 098113608 29 201000640 煤塵在2mass%以下）。依此的話，藉由將煤塵再度利用轉膛 爐施行煉製，便如下述，可將第1回收煤塵中的鋅濃縮。當 第1回收煤塵中的鋅濃度達既定量以上時，在第1回收煤塵 中混合入碳系固態還原材料與鐵礦，亦可增加還原鐵製造 量。當在第1回收煤塵中混合入鐵礦並施行處理時，若與第 2回收煤塵中的目標鋅濃度相同，則當使用含高鋅鐵礦時， 便可增加鐵礦調配量，因而可一邊進行煤塵中的鋅濃縮，一 邊製造更多量還原鐵，故屬較佳。 煤塵中的鋅濃縮係如圖8所示，將煤塵場23的第1回收 煤塵使用粉體搬送用運料車18等進行搬送，並利用轉膛爐 15施行加熱，且抽吸所生成的排氣，再利用排氣管用濾袋 集塵器17施行煤塵回收便可實施。或，如圖9所示，藉由 與混合原料的漏斗11、12並排設置第1回收煤塵儲存漏斗 22便可實施。此設備係相對於圖7所示設備，追加回收煤 塵搬送輸送帶21與第1回收煤塵儲存漏斗22。回收煤塵搬 送輸送帶21係分支為21a、21b，利用第1回收煤塵搬送輸 送帶21a將第1回收煤塵搬送入第1回收煤塵儲存漏斗22 中，再利用轉腔爐15施行加熱而再利用，並利用第2回收 煤塵搬送輸送帶21b將第2回收煤塵依產品形式抽取出。所 抽取出的第2回收煤塵係屬於微粉，因而使用例如粉體搬送 用運料車18等進行搬送。 當在煤塵中混合入鐵礦時，將第1回收煤塵儲存於第1 098113608 30 201000640 回收煤塵儲存漏斗22中，藉由調配人少量的碳系固態還原 材料、與鐵礦’便可使用為轉膛爐的原料，當利用轉膛爐 15施行加熱而進行還原時，便依第2回收煤塵的形式回收。 如前述’含有粗氧化鋅的第2回收煤塵係配合辞濃度會有 不同的使用料’但依上述方法所生產的第2喊煤塵，因 為辞毅超過1()刪8%，_可_諸如華爾滋法等中間處 理形成尚濃度的粗氧化辞，可使用為鋅煉製原料。 f 0收第1回收煤塵時的混合原料’即使礦石全部均非屬含 高鋅之礦场Jt況’若礦石巾的平均鋅濃度達請5mass% 以上，便可使經轉腔爐處理而獲得第2回收煤塵的辞濃度達 5〇_%以上。若所獲得回收煤塵的鋅濃度達50mass%以 上’便不需要中間處理’可直接使用為鋅精煉所使用的粗氧 化鋅，因而屬較佳。 如上述’針對回收煤塵（第1回收煤塵）藉由利用轉腔爐再 (度施行處理’便可提升回收煤塵（第2回收煤塵）中的辞濃 度’且經濟性亦提升。除此之外，具有不需要設置為施行煤 塵處理的其他設備（巾間處理設備)之設置成本，且亦不需要 將所生成煤塵搬送至中間處理設備處的搬送成本之優點。 上述中’將由轉膛爐所生成排氣中含有的煤塵回收並使 用’但亦有躲回收煤塵以外的含鋅煤塵，在將含高辞鐵礦 利用轉膛爐施行還原之際混合使用。藉由混合入鋅濃度較高 於含南鋅鐵礦的煤塵，便如上述，從由轉膛爐所生成排氣中 098113608 31 201000640 回㈣顧’便可獲得具有高濃度粗氧化鋅的煤塵。 如别述，含有粗氧化鋅的回收煤塵係配合辞濃度而有不同 的使用用途，但不管自家產生、或外部產生，使用含辞煤塵 所生產的回收煤塵均可達鋅濃度超過1〇刪说，因而利用諸 如華爾滋法等中間處理便可形成高濃度的粗氧化鋅，可使用 為辞煉製原料。 與3间辞鐵礦混合使用的含辞煤塵並無特別的限制，可使 用例如來自高爐的生成煤塵、來自轉爐的生成煤塵、來自電 爐的生成煤塵等鋼鐵業的煤塵等。 若混合原料中的平均鋅濃度達〇 45mass%以上，便可使由 轉腫爐施行處理所獲得回收煤塵的鋅濃度達5〇mass%以 上。右所獲得回收煤塵的鋅濃度達5〇_%以上，便不需要 里可直接使用為鋅精煉所用的粗氧化鋅，因而屬較 佳。 2士上述，當將含咼鋅鐵礦利用轉膛爐進行還原時，藉由 一 3鋅煤塵使用，便可提升回收煤塵中的鋅濃度，且亦 提升經濟性。 以下，針對實施形態2之一實施形態進行詳細說明。 2轉赌爐的爐床上裝載著含有：含高鋅鐵石廣與碳系固態還 原d的％合原料’ 一邊使爐床進行旋轉而使爐内移動一邊施 /一 力熱，並將空氣或附加氧的空氣吹入爐内，使利用還 原反應所生成的C0或H2進行2次燃燒。 098113608 32 201000640 所生成的排氣經冷卻後，將排氣中— 爐床上所殘存的混合原料充分#所含有㈣塵回收。使 另一方面 . 1 J -5¾. 〇 ’礦石中的鋅份係依氧化鋅 固態還原材料進行還原揮發並被 二子，利用碳系 時亦進扞取一 "h，l & . 氣在冷卻之同 疋原，獲得還原鐵。 塵回 製 時亦進行氧化凝聚，而從排氣中分離出;冷部 收。該煤塵係鋅經濃化，直接或 虽作煤塵 的原料。 ’χ ν驟而成為鋅煉 因為轉膛爐係未具有填充層的爐，因 出現，因原料所含有的鋅份崎於爐 爐中所 出現黏著、填充物呈鈍態化等現象發生，不二:炭或確石 情況。 θ出現知作障礙 _爐加熱時鋅成分會揮發，在被搬〜 爐床上崎載岐合雜其中1分飛散，岐^ 口同= 塵中。所《，回收煤塵中的鋅濃度係依照所揮發的鋅份量鱼 飛散的混合騎量而蚊，混合原射的鋅濃度越高，麟 回收煤塵的鋅濃度越高。減本發明料的研究，確認到混 合原料的錄量在通常猶巾幾乎H屬於混合原料投 入量的〇.5mass%左右。且，煤塵中的鋅濃度越高，鋅原料 的價值越高。所以，藉由實施實施形態2，便可回收鋅濃度 較高的煤塵，俾可更有效地利用含高鋅鐵確。 再者，藉由轉膛爐上所裝載混合原料的全部或其中一部分 係使用所回收的煤塵，而亦可將上述鋅濃度較高的煤塵中之 098113608 33 201000640 鋅更進一步濃縮並回收。 [實施例2] 為確認實施形態2的有效性，便在如同圖6所示的相同轉 膛爐中，使用含高鋅鐵礦、及鋅含有量較低的一般礦石，施 行還原鐵的製造試驗。此外，亦將由轉膛爐所生成的煤塵回 收並施行鋅濃度測定。轉膛爐的規格係如表10所示。 [表 10]Furnace center diameter 7m Furnace width lm Heating temperature 1300~1500〇C The composition of the ore used is shown in Table 2. [Table 2] (mass%) T-Fe FeO Si02 ai2o3 Zn Ore A 63.0 23.2 4.28 1.13 0.050 Ore B 64.0 22.3 4.1 1.00 0.001 Ore A contains high-zinc iron ore, ore B is a general ore with a low zinc content. Although both the gangue and the iron are roughly the same, the ore A has a zinc concentration of about 50 times that of the ore B. The ore, the carbon stagnation of the raw materials, and the lime of the materials are mixed to form a mixed raw material. Table 3 shows the composition of the coal used, and Table 4 shows the blending of the mixed materials used in the test. In addition, in Table 3, FC refers to fixed carbon, VM system directs hair, and Ash refers to ash. [Table 3] (mass%) FC VM Ash Si02 ai2o3 Coal 85 7 8 4.5 2.5 098113608 20 201000640 [Table 4] (kg/t-iron) Ore A Ore B Coal Lime Blending 1 — 1562 344 171 Blending 2 1587 — 343 179 Dispensing 3 145 1420 345 171 Using the adjustments 1 to 3 shown in Table 4, perform the operation of the converter according to the conditions shown in Table 5. The carbon material of the carbon material is recorded on the hearth by a layer thickness of 50 mm, and the raw material is mixed in the upper layer, and this condition is referred to as "the lower carbon material", and the mixed raw material is loaded under the unblocking layer thickness. The case of use of about 10 mm is referred to as "powder", and the case where the particles are formed into a particle size of 10 to 15 mm is referred to as "block", and is indicated in the raw material state. [Table 5] Operation No. Temperature (°C) Preparation of lower carbon material Raw material status Remark 1 1400 1 No powder Comparative Example 2 1460 1 No powder Comparative Example 3 1400 2 No powder Inventive Example 4 1400 3 No powder Example of the present invention 5 1460 2 Powder-free Inventive Example 6 1460 2 Powdered Inventive Example 7 1460 2 No block. Table 6 of the present invention shows the zinc dust concentration and iron recovery rate when the granular iron is produced according to the conditions shown in Table 5. result. 098113608 21 201000640 [Table 6] Operation No. Coal dust Zinc concentration Iron recovery rate Treatment time Remarks 1 0.20% 97.0% 14 points Comparative Example 2 0.19% 97.0% 13 points Comparative Example 3 7.8% 97.0% 13.5 points Inventive Example 4 1.0 % 97.0% 13.5 Inventive Example 5 8.1% 98.0% 13 points Inventive Example 6 7.9% 99.0% 12 points Inventive Example 7 9.6% 99.5% 12 points In the present invention, in Table 6, the operation No. 3 is used in a high content. An example of the invention of zinc ore. The zinc concentration in the coal dust rose to 7.8 mass ° / 〇. Operation No. 4 is an example in which about 10 mass% of high zinc iron ore is blended in general ore. In this case, the zinc concentration in the coal dust is increased to more than 1.0%. Operation No. 5 was subjected to heat treatment at a high temperature of 1450 ° C or higher, and it was found that the treatment time was shortened and the productivity was improved. In the operation No. 6, in addition to the operation No. 5, the carbon material was laid on the hearth, and when the mixed raw material was laminated thereon, the iron recovery rate was increased. Operation No. 7 is a case where the bulk material is used in addition to the operation No. 5, and the zinc concentration in the coal dust increases. Secondly, the recycling of recovered coal dust is carried out. Using the same equipment as shown in Fig. 1 and Fig. 4, using a high-zinc iron ore and a general iron ore with a low zinc content, the iron ore production test is conducted, and the iron ore concentration and the recovered coal dust are investigated. The relationship between zinc concentrations. At the time of the investigation, 098113608 22 201000640 ore A containing the high iron ore was mixed with the ore B of the ordinary iron ore, and the zinc concentration was continuously changed and divided into operations No. 11 to 19, and the first use was transferred. The coal dust (first recovered coal dust) generated by the furnace treatment is recovered, and the entire amount of the collected coal dust is subjected to heat treatment at 1460 ° C for 13 minutes using a rotary kiln, and the generated coal dust (second recovered coal dust) is recovered. Table 7 and Fig. 5 show the zinc concentration of the ore in the mixed raw material and the coal dust generated by the first use of the converter, and the first recovered coal dust of the raw material processed by the converter. The result of the concentration measurement and the measurement result of the zinc concentration of the second recovered coal dust of the final product coal dust. As is clear from Table 7 and Fig. 5, if the concentration of ore zinc in the mixed raw material is 0.005 mass% or more, the concentration of the second recovered coal dust of the finished coal dust exceeds 50 mass%, and it can be directly used as a raw material for zinc refining such as the ISP method. [Table 7] Operation No. Ore A _ ratio Zinc concentration Second recovery coal dust original unit Remarks Mixed raw material ore First recovery coal dust Second recovery coal dust mass% mass% mass% mass% kg/t-Fe 11 0.0 0.001 0.16 23 0.067 Comparative Example 12 3.0 0.002 0.41 41 0.096 Inventive Example 13 5.0 0.003 0.57 47 0.116 Inventive Example 14 6.0 0.004 0.65 50 0.125 Inventive Example 15 7.5 0.005 0.77 53 0.140 Inventive Example 16 8.0 0.005 0.81 54 0.145 Example 17 10 0.006 0.97 57 0.164 Inventive Example 18 15 0.008 1.36 62 0.213 Inventive Example 19 20 0.011 1.76 66 0.261 Inventive Example 098113608 23 201000640 Next, a raw material containing high zinc iron ore mixed with zinc-containing coal dust was used. The composition of the zinc-containing coal dust used is shown in Table 8. Here, the zinc-containing coal dust is used to generate coal dust from a converter. [Table 8] T-Fe FeO Si〇2 ai2o3 Zn Zinc-containing coal dust 48 16.29 1.49 1.17 1.4 Using the same equipment as shown in Figure 1, using high-zinc iron ore and zinc-containing coal dust for the production of granular iron, investigate The relationship between the concentration of zinc in the mixed raw material and the zinc concentration of the recovered coal dust. In the investigation, the ore A containing high zinc iron ore was mixed with zinc-containing coal dust, and the zinc concentration was continuously changed and divided into operation No. 21 to 25, and the mixed raw material was carried out by using a rotary furnace at 1460 ° C. Heat treatment in minutes and recover the generated coal dust. Table 9 shows the measurement results of the zinc-containing coal dust blending ratio, the zinc concentration, and the zinc concentration of the recovered coal dust in the mixed raw materials. [Table 9] Operation No. Zinc-containing coal dust blending ratio Concentration Remarks Mixed raw material recovered coal dust mass% mass% mass% 21 0 0.04 8 Inventive Example 22 10 0.17 28 Inventive Example 23 20 0.31 41 Inventive Example 24 30 0.45 50 Inventive Example 25 35 0.51 53 In the example of the present invention, it is known from Table 9 that as the zinc-containing coal dust mixing ratio in the mixed raw material increases, the zinc concentration of the recovered coal dust of 098113608 24 201000640 also rises, if the zinc concentration in the mixed raw material reaches O.Cmass% or more, the concentration of recovered coal dust and zinc belonging to the finished coal dust will exceed 50 mass%, and it can be used as a raw material directly used by the isp method. Embodiment 2: The method for producing reduced iron according to Embodiment 2 includes a step of preparing a mixed raw material, a step of loading a mixed raw material, and a reducing step. The step of preparing the mixed raw material for the mountain is to prepare a mixed raw material containing iron ore containing high zinc iron ore and mixed with a carbon-based solid reducing material containing O. Ommass. /. Above, iron 5〇mass% or more. The mixed raw material cracking step is to load the above mixture (4) on a mobile hearth. The county step is to order the heat supply from the hearth, and to reduce the mixed raw materials loaded on the mobile hearth, and to make the above-mentioned mixed riding tree melt or only the towel-part (4) to obtain reduced iron. The inventors of the present invention have used a high-zinc iron, and in order to effectively utilize the iron and zinc contained therein, it is considered to use a hearth mobile furnace. The method for producing reduced iron in a trampoline mobile furnace is one of the processes for producing reduced iron, and is placed on a hearth moving in the direction of water, loaded with iron ore and solid reducing material, and transmitted from one side = 仃 radiation When heated and heated, the iron ore is reduced to produce reduced iron. The moving furnace of the hearth is heated in the process of moving the hearth of the heating furnace to the horizontal direction. The so-called "horizontal movement of the hearth 11" is performed as shown in Fig. 6 The shape of the hearth mobile __ is 098113608 furnace. In the second embodiment, the cast iron moving furnace (especially the rotary chamber 25 201000640 furnace) is used to reduce the high-zinc-containing iron ore to produce reduced iron. Hereinafter, the case where a rotary kiln is used for a furnace moving furnace will be described based on the second embodiment. In addition, the so-called "high-zinc-containing iron ore" used in the second embodiment is higher in zinc content than iron ore which is usually used as a blast furnace raw material, and generally contains 0.01 mass% or more of iron and 50 mass% of iron. /〇 above the iron ore. The upper limit of the zinc content and the iron content of the high-zinc-containing ore used in the second embodiment is not limited, and it is determined by the iron ore. The relevant zinc system is, for example, less than 5 mass%, and the relevant iron system is, for example, 70 mass% or less. Further, the content of the alkali component such as Na2〇 or K2〇 containing high zinc iron ore is usually 0.08 mass% or more in terms of oxide. The alkali component content is preferably lmass% or less for the purpose of effectively preventing clogging of the converter exhaust system. In the second embodiment, the technique for producing reduced iron by using the high-zinc iron ore is used. When the high-zinc-containing iron ore is reduced by a rotary kiln, it can be mixed with ordinary iron ore. In the case where the mixed iron ore is used, when the high-zinc-iron ore is blended into the ore as a whole, the effect of the second embodiment can be appropriately obtained. The embodiment of Fig. 6 is used for the rotary kiln used in the second embodiment. The rotary chamber furnace system is shown in Fig. 6. The furnace body 2, which is divided into a pre-tropical reduction belt 2b and a cooling belt 2d, is covered with a rotary moving furnace = the second rotary hearth 3 is loaded with, for example, high zinc. Iron is indeed mixed with carbon (four) money heart raw material 4. The mixed raw material 4 can also be applied and soiled as follows. The furnace body 2 covering the rotary hearth 3 is attached with a refractory. And 098113608 26 201000640 protects the refractory of the hearth, and also has the case where the carbon material is loaded on the hearth θ A and the raw material 4 is laminated thereon. Further, a burner 5 is provided on the upper portion of the body 2, and the fuel of the burner 5 is burned to heat the iron ore in the mixed raw material 4 on the rotary hearth 3. Further, in Fig. 6, '6' is a loading device for loading the raw material into the square crucible bed 3, and 7 pens are the discharge devices for discharging the originals, and 8 series cooling devices. The general furnace temperature system ^ B_ is 13 〇〇. Hey around. The reason is to contribute to the extension of the life of the furnace refractory. 4.^5, . This service is not actively mixing the original, 枓 ’ 'but in the process of reducing the bean ' ^ ^. The case of smelting is also covered in the scope of her form 2. The high-zinc-containing iron ore system contains gangues that differ according to the origin of the Ba Shi ice. In addition, there are gray knives in coal, coal char, and coke in the carbon-based solid-state reduction materials. Therefore, it is not the same as the blast furnace-transfer method, and the hearth-moving furnace method that is still used in the mouth is not avoided, and there are also cases where the gangue is not able to adhere to the finished product. The mixed t can be this. Therefore, the shield obtained in the second embodiment has not yet been #八八# V original iron gangue composition, ash «not filled with a knife, so the appearance of the 曰谕 曰谕 厌 # # β 1 just from the converter The state before the discharge, and the pressure is applied, is in the state of 〆田喆丄句3〇0〇kg/m3. Although the use of a rotary kiln, when the high-zinc-containing iron is widely used in the reduction of the moxibustion, it is also mixed into the stone-reverse solid-state reducing material, and the shock can be 151, and the shovel can be moved to the moving hearth. Carbon-based solids “raw materials such as coal, coke, graphite, etc.. In the case of high-zinc-iron ore-bearing ore blocks, such as ridges and τ Λ target pulverization, for example, the formation of the Gmm below _ stone powder 098113608 u This can be reduced by mixing with carbon-based solid reducing material 27 201000640 and loading it on a rotary hearth. The surface zinc-iron is finely powdered (with a particle size of 3 mni or less), together with the carbon-based solid reducing material. It is used in the form of lumps, and is used in the form of particles containing carbonaceous materials. The entangled raw materials have less scattering during heating and can increase the zinc concentration of coal dust. Similarly, compression forming can be carried out. It can be used after the block. In addition, when it is formed into a block, it can also be mixed with an inorganic binder such as bentonite or an organic binder such as molasses and corn house powder to increase the strength. The particles and compacts can also be used. On the other hand, the use of high-zinc-iron ore directly in the form of powder also has an effect. By directly using the powder raw material, there is no need for the equipment cost for manufacturing the block. It is also not necessary to use the power, binder, etc. required for the production of the block, and contributes to the economic improvement. The heating temperature for the reduction of the high-zinc-iron ore by the rotary furnace is preferably 1250 C or more. The maximum temperature in the rotary kiln is set to 125 (rc or more, and the raw material in the furnace and in the furnace is heated at a high temperature. By setting it to 125 〇 ° C or higher, the reduction reaction is fast, and the reduced iron can be produced at a high speed. In the second embodiment, the upper limit of the heating temperature is a temperature at which the mixed raw material has not completely melted (less than 1450 C). In the normal operation, it is controlled to be less than μ (10). c. By loading the carbon material on the hearth, and The carbon material is laminated with a mixed raw material containing high-zinc iron ore to prevent the partially melted mixed raw material from invading the fireworks of the hearth. When the K fire is subjected to money, the iron is inhaled into the refractory. Therefore, by preventing the refractory of the hearth from being invaded by the insect, the loss of the iron 098113608 28 201000640 can be reduced, contributing to the productivity improvement of the reduced iron. The coal dust contained in the exhaust gas generated in the rotary furnace is recovered. The coal dust is compared to: Under the iron, because the zinc is thicker, it can be used as a raw material for the crude oxidation. Figure 7 is not a schematic diagram of the equipment flow of the furnace. Figure 7 in 'from the ore funnel n, coal funnel! 2 iron ore discharged in the second, = charcoal 'mixed machine 14 (using a granulator, etc. if necessary) to form a mouth and gas into the furnace 15 to heat and reduce to form reduced iron, and then The phase iron discharge σ 16 is discharged. The exhaust gas generated by the rotary chamber furnace 15 is sucked by the exhaust fan 19 and discharged from the smoke (four). At this time, the exhaust pipe performs coal dust (4) with the pocket dust collection It η. When the high-zinc-iron ore is blended and the total amount of the stone is about 1 Gmass% or more, the concentration of the recovered coal dust can be lmass% or more. "Similar to the above, the coal dust recovered from the exhaust gas generated by the furnace (hereinafter referred to as the "Dust 1" «dust), (4) degree of heat supply and treatment, will be generated by the furnace _ deer X With coal dust recovery, you can get::'. In the paste 1, the coal dust is recycled and reused in the converter. The material that will generate the coal dust will be recovered. Recycling of coal dust is carried out using the transfer hall to process ^, ^ 2 to recover coal dust." , /, to the brother 1 recycling coal dust can be treated, but from the promotion of the original _ _ recycling coal dust a small amount of mixed shirt (four) to reduce # material (phase material d recovery 098113608 29 201000640 coal dust below 2mass%). In this case, by re-smelting the coal dust by the rotary kiln, the zinc in the first recovered coal dust can be concentrated as follows. When the zinc concentration in the first recovered coal dust is more than the quantitative amount, the first The recovered coal dust is mixed with the carbon-based solid reducing material and the iron ore, and the reduced iron production amount can also be increased. When the iron ore is mixed and treated in the first recovered coal dust, the target zinc concentration in the second recovered coal dust is the same. When the high-zinc iron ore is used, the iron ore blending amount can be increased, so that it is preferable to produce a larger amount of reduced iron while performing zinc concentration in the coal dust. The zinc concentration in the coal dust is as shown in the figure. As shown in Fig. 8, the first recovered coal dust of the coal dust field 23 is transported by the powder transfer conveyance cart 18 or the like, and is heated by the rotary kiln 15, and the generated exhaust gas is sucked, and the exhaust pipe filter is used. The bag dust collector 17 can perform coal dust recovery. Alternatively, as shown in Fig. 9, the first recovered coal dust storage funnel 22 may be disposed side by side with the funnels 11 and 12 of the mixed raw materials. The equipment is additionally recovered with respect to the equipment shown in Fig. 7 and the coal dust conveying conveyor belt is additionally recovered. 21 and the first recovered coal dust storage funnel 22. The recovered coal dust transfer conveyor 21 is branched into 21a and 21b, and the first recovered coal dust transport conveyor 21a is used to transport the first recovered coal dust into the first recovered coal dust storage funnel 22, and reused. The rotary chamber furnace 15 is heated and reused, and the second recovered coal dust is extracted according to the product by the second recovered coal dust transfer conveyor belt 21b. The second recovered coal dust extracted is a fine powder, and thus, for example, powder transfer is used. When the iron ore is mixed in the coal dust, the first recovered coal dust is stored in the recovered coal dust storage funnel 22, and a small amount of carbon-based solid reducing material is blended with The iron ore' can be used as a raw material for the rotary kiln, and when it is reduced by heating by the rotary kiln 15, it is recovered in the form of the second recovered coal dust. The second recovered coal dust system has different usage materials, but the second shouting coal dust produced by the above method, because the rhyme exceeds 1 (), 8%, _ can be formed by intermediate treatment such as Waltz The crude oxidation of the concentration can be used as a raw material for zinc refining. f 0 The mixed raw material in the first recovery of coal dust is 'even if the ore is not a high-zinc-containing mine Jt condition' if the average zinc concentration of the ore towel reaches If the amount is 5 mass% or more, the concentration of the second recovered coal dust obtained by the rotary chamber furnace can reach 5 〇 _% or more. If the zinc concentration of the recovered coal dust is 50 mass% or more, the intermediate treatment is not required. It is preferred to use the crude zinc oxide used for zinc refining. As described above, the use of the rotary chamber furnace for the recovery of coal dust (the first recovered coal dust) can improve the concentration of the recovered coal dust (the second recovered coal dust) and the economy is also improved. There is an installation cost of other equipment (inter-storage processing equipment) that does not need to be set to perform coal dust treatment, and there is no need to transfer the generated coal dust to the intermediate processing equipment. The above-mentioned will be replaced by a converter furnace. The coal dust contained in the exhaust gas is recovered and used, but the zinc-containing coal dust other than the coal dust is also used in combination, and the mixed iron ore is used in the reduction furnace. The zinc concentration is higher by mixing. The coal dust containing the south zinc iron ore is as described above, and the coal dust with high concentration of coarse zinc oxide can be obtained from the exhaust gas generated by the converter, 098113608 31 201000640 (4) Gu. As described above, the crude zinc oxide is contained. The recovery of coal dust is different from the use of the concentration of the coal dust, but whether it is produced by itself or externally generated, the recovered coal dust produced by using the coal-containing dust can reach a zinc concentration of more than 1 〇. Therefore, a high concentration of crude zinc oxide can be formed by intermediate treatment such as the waltz method, and can be used as a raw material for refining. There is no particular limitation on the coal-containing dust used in combination with the three iron ore, and for example, Coal dust generated in the blast furnace, coal dust generated from the converter, coal dust from the steel industry such as coal dust generated from the electric furnace, etc. If the average zinc concentration in the mixed raw material reaches mas45 mass% or more, the recovered coal dust obtained by the treatment of the rotary furnace can be obtained. The zinc concentration is more than 5 〇 mass%. The zinc concentration of the recovered coal dust obtained by the right is more than 5 〇 _%, so that it is not necessary to directly use the crude zinc oxide used for zinc refining, so it is preferable. When the cerium-containing zinc iron ore is reduced by a rotary kiln, the zinc concentration in the recovered coal dust can be increased by using one of the three zinc dusts, and the economy is also improved. Hereinafter, an embodiment of the second embodiment is carried out. The 2nd turn gambling furnace is equipped with a "% raw material containing high zincite and a carbon-based solid-state reduction d" while rotating the hearth to move the furnace. Heat, and air or oxygen-laden air is blown into the furnace to make 2 times of combustion using C0 or H2 generated by the reduction reaction. 098113608 32 201000640 The generated exhaust gas is cooled and then exhausted - on the hearth The remaining mixed raw materials are fully contained in (4) dust recovery. On the other hand, 1 J -53⁄4. The zinc in the ore is reduced and volatilized by the zinc oxide solid reducing material and is replaced by two. Take a "h,l & . gas in the same cooling as the original, to obtain reduced iron. Oxidation and condensation in the dust recovery system, and separated from the exhaust; cold part of the collection. The coal dust is concentrated by zinc Directly or as a raw material for coal dust. 'χ ν 成为 成为 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 锌 因为 因为 因为 因为 因为 因为 因为 因为 因为 因为 因为It is a phenomenon of passivation, etc., not the case of charcoal or real stone. θ appears to be a barrier to obstacles _ The zinc component will volatilize when heated, and it will be moved to the hearth of the furnace. One of the points is scattered, and the same is true. "The concentration of zinc in the recovered coal dust is based on the mixed amount of the scattered amount of zinc. The higher the zinc concentration of the mixed original, the higher the zinc concentration of the recovered coal dust. In the study of the reduction of the material of the present invention, it was confirmed that the amount of the mixed raw material was about 55 mass%, which is almost H, which is the amount of the mixed raw material. Moreover, the higher the zinc concentration in the coal dust, the higher the value of the zinc material. Therefore, by carrying out the second embodiment, it is possible to recover coal dust having a high zinc concentration, and it is possible to more effectively utilize high-zinc-containing iron. Further, by using the recovered coal dust in all or a part of the mixed raw materials loaded on the rotary kiln, the 098113608 33 201000640 zinc in the coal dust having the higher zinc concentration may be further concentrated and recovered. [Example 2] In order to confirm the effectiveness of the second embodiment, in the same rotary kiln as shown in Fig. 6, the production of reduced iron was carried out using a general ore containing high zinc iron ore and a low zinc content. test. In addition, the coal dust generated by the converter is also recovered and the zinc concentration is measured. The specifications of the converter are shown in Table 10. [Table 10]

爐中心直徑 7m 爐寬 lm 加熱溫度 1300~1500〇C 所使用礦石的組成係如表11所示。此外，表11中，「T-Fe」 係指總計Fe。 [表 11] (mass%) T-Fe FeO Si02 Al2〇3 Zn 礦石A 63.0 23.2 4.28 1.13 0.050 礦石B 64.0 22.3 4.1 1.00 0.001 礦石A係含高鋅鐵礦，礦石B係鋅含有量較低的一般礦 石。雖脈石份及鐵份二者大致相同，但礦石A的鋅濃度為 礦石B的約50倍左右。 將礦石、與碳系固'態還原材料的煤炭進行混合而形成混合 原料。表12所示係所使用煤炭的組成，表13所示係試驗所 使用混合原料的調配。此外，表12中，FC係指固定碳， VM係指揮發份，Ash係指灰分。 098113608 34 201000640 [表 12] (mass%) FC VM Ash Si02 Al2〇3 煤炭 85 7 8 4.5 2.5 [表 13] (kg/t-iron) 礦石A 礦石B 煤炭 調配1 — 1562 344 調配2 1587 — 343 調配3 145 1420 345 使用表13所示調配1〜3，依照表14所示條件進行轉膛爐 的操作。在爐床上將碳質材的煤炭鋪設層厚50mm，並在其 上面積層混合原料，將此情況設為「有下層碳質材」，且將 混合原料係在未成塊化下裝載呈層厚約10mm使用的情況 記為「粉」，將經成塊化而形成粒徑10〜15mm顆粒的情況記 為「塊」，並標示於原料狀態攔位中。 [表H] 操作No. 溫度（°C) 調配 下層碳質材 原料狀態 備註 1 1200 1 無 粉 比較例 2 1260 1 無 粉 比較例 3 1200 2 無 粉 本發明例 4 1200 3 益 粉 本發明例 5 1260 2 益 粉 本發明例 6 1260 2 有 粉 本發明例 7 1260 2 無 塊 本發明例 表15所示係依照表14所示條件進行還原鐵製造時，煤塵 鋅濃度與鐵份回收率的結果。 098113608 35 201000640 [表 15] 操作No. 煤塵辞濃度 鐵份回收率 處理時間 備註 1 0.18% 97.0% 12分 比較例 2 0.17% 97.0% 11分 比較例 3 7.6% 97.0% 11.5 分 本發明例 4 1.0% 97.0% 11_5 分 本發明例 5 7.9% 98.0% 10.5 分 本發明例 6 7.8% 99.0% 10.5 分 本發明例 7 8.8% 99.5% 10.5 分 本發明例 表15中，操作No.3係使用含高鋅之礦石的本發明例。煤 塵中的鋅濃度上升至7.6mass°/〇。 操作No.4係在一般礦石中調配入約lOmass%含高鋅鐵礦 的情況例。此情況亦是煤塵中的鋅濃度上升至l.Omass%以 操作No.5係經1250°C以上的高溫施行加熱處理，得知處 理時間縮短，生產性提升。 操作No.6係除操作No.5之外，尚在爐床上鋪設碳質材， 並在其上積層著混合原料的情況，鐵份回收率上升。 操作No.7係除操作No.5之外，尚使用塊原料的情況，煤 塵中的鋅濃度上升。 其次，施行所回收煤塵的再生利用。 利用如同圖6、圖9所示的相同設備，使用含高鋅鐵礦、 及鋅含有量較低的一般礦石，施行還原鐵製造試驗時，調查 098113608 36 201000640 礦石的鋅濃度、與所回收煤塵的鋅濃度間之關係。調查時係 將含高鋅礦石的礦石A、與普通礦石的礦石B進行混合使 ' 用，使鋅濃度連續變化而分設為操作No.11〜19，將第1次 " 利用轉膛爐施行處理所生成煤塵（第1回收煤塵）回收，所回 收的煤塵全量利用轉膛爐依1260°C施行13分鐘的加熱處 理，所生成的煤塵（第2回收煤塵）回收。 表16及圖10所示係混合原料中的礦石鋅濃度、與第1 ,f 次利用轉膛爐施行處理所生成的煤塵，成為第2次利用轉膛 爐施行處理的原料之第1回收煤塵的鋅濃度測定結果、與最 終成品煤塵的第2回收煤塵之鋅濃度測定結果。 [表 16] 操作No. 礦石A 調配比 鋅濃度 第2次回收煤 塵原單位 備註 混合原 料礦石 第1次回 收煤塵 第2次回 收煤塵 mass% mass% mass% mass% kg/t-Fe 11 0.0 0.001 0.16 22 0.071 比較例 12 3.0 0.002 0.38 38 0.102 本發明例 13 5.0 0.003 0.55 46 0.118 本發明例 14 6.0 0.004 0.64 49 0.127 本發明例 15 7.5 0.005 0.78 53 0.141 本發明例 16 8.0 0.005 0.79 53 0.147 本發明例 17 10 0.006 0.99 58 0.162 本發明例 18 15 0.008 1.42 63 0.209 本發明例 19 20 0.011 1.83 67 0.257 本發明例 由表16及圖10中得知，混合原料中的礦石鋅濃度若達 098113608 37 201000640 0.005mass%以上，成品煤塵的第2回收煤塵鋅濃度便超過 50mass%，可直接使用為ISP法等辞精煉的原料。 其次，使用含高鋅鐵礦與含鋅煤塵相混合的原料。 所使用含鋅煤塵的組成係如表Π所示。在此，含鋅煤塵 係使用來自轉爐的生成煤塵。 [表Π] T-Fe FeO Si02 Al2〇3 Zn 含鋅煤塵 48 16.29 1.49 1.17 1.4 利用如同圖6所示的相同設備，使用含高鋅鐵礦、及含鋅 煤塵，施行還原鐵製造試驗時，調查混合原料中的鋅濃度、 與所回收煤塵的鋅濃度間之關係。調查時係使用將含高鋅鐵 礦的礦石A與含鋅煤塵相混合，並使鋅濃度連續變化而分 設為操作No.21〜25，混合原料係利用轉膛爐依1260°C施行 13分鐘的加熱處理，並將所生成的煤塵回收。 表18所示係混合原料中的含鋅煤塵調配比率、與鋅濃 度、及回收煤塵的鋅濃度之測定結果。 [表 18] 操作No. 含鋅煤塵調配比 鋅ϋ t度 備註 混合原料 回收煤塵 mass% mass% mass% 21 〇 0.04 8 本發明例 22 10 0.17 29 本發明例 23 20 0.31 42 本發明例 24 30 0.45 51 本發明例 25 35 0.51 55 本發明例 由表18中得知，隨混合原料中的含辞煤塵調配比率上 098113608 38 201000640 升，回收煤塵的鋅濃度亦隨之上升，若混合原料中的鋅濃度 達0.45mass%以上，屬於成品煤塵的回收煤塵鋅濃度便會超 過50mass%，可成為ISP法等鋅精煉能直接使用的原料。 【圖式簡單說明】 圖1為實施形態1所使用轉膛爐一實施形態概略圖。 圖2為實施形態1所使用設備流程一實施形態概略圖。 圖3為實施形態1所使用設備流程一實施形態概略圖（回 收煤塵利用）。 圖4為實施形態1所使用設備流程一實施形態概略圖（回 收煤塵利用）。 圖5為實施例1中，相對於混合原料的含高鋅之礦石調配 率，鋅濃度的變化圖。 圖6為實施形態2所使用轉膛爐一實施形態概略圖。 圖7為實施形態2所使用設備流程一實施形態概略圖。 圖8為實施形態2所使用設備流程一實施形態概略圖（回 收煤塵利用）。 圖9為實施形態2所使用設備流程一實施形態概略圖（回 收煤塵利用）。 圖10為實施例2中，相對於混合原料的含高鋅之礦石調 配率，鋅濃度的變化圖。 【主要元件符號說明】 1 轉膛爐 098113608 39 201000640 2 爐體 2a 預熱帶 2b 還原帶 2c 熔融帶 2d 冷卻帶 3 旋轉爐床 4 混合原料 5 燃燒器 6 裝入裝置 7 排出裝置 8 冷卻裝置 11 礦石漏斗 12 煤厌漏斗 13 造渣材料漏斗 14 混合機 15 轉膛爐 16 還原鐵排出口 17 排氣管用濾袋集塵器 18 粉體搬送用運料車 19 抽風扇 20 煙囪 21 回收煤塵搬送輸送帶 098113608 40 201000640 21a 第1回收煤塵搬送輸送帶 21b 第2回收煤塵搬送輸送帶 22 第1回收煤塵儲存漏斗 23 煤塵場 098113608 41Furnace center diameter 7m Furnace width lm Heating temperature 1300~1500〇C The composition of the ore used is shown in Table 11. Further, in Table 11, "T-Fe" means a total of Fe. [Table 11] (mass%) T-Fe FeO Si02 Al2〇3 Zn ore A 63.0 23.2 4.28 1.13 0.050 Ore B 64.0 22.3 4.1 1.00 0.001 Ore A contains high-zinc iron ore, ore B is low in zinc content. ore. Although both the gangue and the iron are roughly the same, the ore A has a zinc concentration of about 50 times that of the ore B. The ore and the coal of the carbon-based solid state reducing material are mixed to form a mixed raw material. Table 12 shows the composition of the coal used, and Table 13 shows the blending of the mixed materials used in the test. In addition, in Table 12, FC means fixed carbon, VM system directs hair, and Ash means ash. 098113608 34 201000640 [Table 12] (mass%) FC VM Ash Si02 Al2〇3 Coal 85 7 8 4.5 2.5 [Table 13] (kg/t-iron) Ore A Ore B Coal Blending 1 — 1562 344 Blending 2 1587 — 343 Preparation 3 145 1420 345 Using the mixing 1 to 3 shown in Table 13, the operation of the converter was carried out in accordance with the conditions shown in Table 14. On the hearth, the coal of the carbon material is layered to a thickness of 50 mm, and the raw material is mixed in the upper layer, and this is referred to as "the lower carbon material", and the mixed raw material is loaded under the unblocking layer thickness. The case of use of 10 mm is referred to as "powder", and the case where the particles are formed into a particle size of 10 to 15 mm is referred to as "block", and is indicated in the raw material state. [Table H] Operation No. Temperature (°C) Preparation of the lower carbonaceous material Raw material state Remarks 1 1200 1 No powder Comparative Example 2 1260 1 No powder Comparative Example 3 1200 2 No powder Inventive Example 4 1200 3 Profit powder Example of the present invention 5 1260 2 Boiler powder Inventive Example 6 1260 2 Powdered Inventive Example 7 1260 2 No block. Table 15 of the present invention shows the zinc dust concentration and iron recovery rate when the reduced iron is produced according to the conditions shown in Table 14. result. 098113608 35 201000640 [Table 15] Operation No. Coal dust concentration Iron recovery rate Treatment time Remarks 1 0.18% 97.0% 12 points Comparative Example 2 0.17% 97.0% 11 points Comparative Example 3 7.6% 97.0% 11.5 points Inventive Example 4 1.0 % 97.0% 11_5 Inventive Example 5 7.9% 98.0% 10.5 Inventive Example 6 7.8% 99.0% 10.5 Inventive Example 7 8.8% 99.5% 10.5 In the present invention, in Table 15, the operation No. 3 is used in a high content. An example of the invention of zinc ore. The zinc concentration in the coal dust increased to 7.6 mass ° / 〇. Operation No. 4 is an example in which about 10 mass% of high zinc iron ore is blended in general ore. In this case, the zinc concentration in the coal dust is increased to 1.0% by mass. The operation No. 5 is subjected to heat treatment at a high temperature of 1250 ° C or higher, and the treatment time is shortened, and the productivity is improved. In the operation No. 6, in addition to the operation No. 5, the carbon material was laid on the hearth, and when the mixed raw material was laminated thereon, the iron recovery rate was increased. Operation No. 7 is a case where the bulk material is used in addition to the operation No. 5, and the zinc concentration in the coal dust increases. Secondly, the recycling of recovered coal dust is carried out. Using the same equipment as shown in Fig. 6 and Fig. 9, using the general ore containing high zinc iron ore and low zinc content, when conducting the reduced iron manufacturing test, investigate the zinc concentration of the ore 098113608 36 201000640 and the recovered coal dust The relationship between the zinc concentrations. In the investigation, the ore A containing high zinc ore and the ore B of ordinary ore were mixed to make the zinc concentration continuously change and set to operation No. 11 to 19, and the first time " The coal dust (first recovered coal dust) generated by the treatment is recovered, and the total amount of the collected coal dust is heat-treated at 1260 ° C for 13 minutes in a rotary kiln, and the generated coal dust (second recovered coal dust) is recovered. In Table 16 and FIG. 10, the zinc concentration of the ore in the mixed raw material and the coal dust generated by the first and the fth times using the rotary kiln are the first recovered coal dust which is the second raw material to be treated by the rotary kiln. The zinc concentration measurement result and the zinc concentration measurement result of the second recovered coal dust of the final product coal dust. [Table 16] Operation No. Ore A ratio Zinc concentration Second recovery coal dust original unit Remarks Mixed raw material ore First recovery coal dust Second recovery coal dust mass% mass% mass% mass% kg/t-Fe 11 0.0 0.001 0.16 22 0.071 Comparative Example 12 3.0 0.002 0.38 38 0.102 Inventive Example 13 5.0 0.003 0.55 46 0.118 Inventive Example 14 6.0 0.004 0.64 49 0.127 Inventive Example 15 7.5 0.005 0.78 53 0.141 Inventive Example 16 8.0 0.005 0.79 53 0.147 Inventive Example 17 10 0.006 0.99 58 0.162 Inventive Example 18 15 0.008 1.42 63 0.209 Inventive Example 19 20 0.011 1.83 67 0.257 The present invention is known from Table 16 and Figure 10, and the concentration of ore zinc in the mixed raw material is 098113608 37 201000640 0.005 Above mass%, the second recovered coal dust zinc concentration of the finished coal dust exceeds 50 mass%, and can be directly used as a raw material refined by the ISP method. Secondly, a raw material containing high zinc iron ore mixed with zinc-containing coal dust is used. The composition of the zinc-containing coal dust used is shown in Table 。. Here, zinc-containing coal dust is used to generate coal dust from a converter. [Formula] T-Fe FeO Si02 Al2〇3 Zn Zinc-containing coal dust 48 16.29 1.49 1.17 1.4 When using the same equipment as shown in Figure 6, using high-zinc iron ore and zinc-containing coal dust for the test of reduced iron production, The relationship between the concentration of zinc in the mixed raw material and the zinc concentration of the recovered coal dust was investigated. In the investigation, the ore A containing high zinc iron ore was mixed with zinc-containing coal dust, and the zinc concentration was continuously changed and divided into operation No. 21 to 25, and the mixed raw material was carried out by using a rotary furnace at 1260 ° C. Heat treatment in minutes and recover the generated coal dust. Table 18 shows the measurement results of the zinc-containing coal dust blending ratio, the zinc concentration, and the zinc concentration of the recovered coal dust in the mixed raw materials. [Table 18] Operation No. Zinc-containing coal dust blending ratio Zinc ϋ t-degree Remarks Mixed raw material recovered coal dust mass% mass% mass% 21 〇 0.04 8 Inventive Example 22 10 0.17 29 Inventive Example 23 20 0.31 42 Inventive Example 24 30 0.45 51 Inventive Example 25 35 0.51 55 The present invention is known from Table 18, and as the ratio of the coal-containing dust in the mixed raw material is 098113608 38 201000640 liters, the zinc concentration of the recovered coal dust also rises, if mixed in the raw material The zinc concentration is more than 0.45 mass%, and the zinc dust concentration of the recovered coal dust which belongs to the finished coal dust will exceed 50 mass%, which can be used as a raw material for direct use of zinc refining such as the ISP method. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing an embodiment of a rotary kiln used in the first embodiment. Fig. 2 is a schematic view showing an embodiment of a flow of equipment used in the first embodiment. Fig. 3 is a schematic view showing an embodiment of the flow of equipment used in the first embodiment (recovering coal dust utilization). Fig. 4 is a schematic view showing an embodiment of a flow of equipment used in the first embodiment (recovering coal dust utilization). Fig. 5 is a graph showing changes in zinc concentration in the case of the high-zinc-containing ore blending ratio of the mixed raw material in Example 1. Fig. 6 is a schematic view showing an embodiment of a rotary kiln used in the second embodiment. Fig. 7 is a schematic view showing an embodiment of a flow of equipment used in the second embodiment. Fig. 8 is a schematic view showing an embodiment of the flow of the apparatus used in the second embodiment (recovering coal dust utilization). Fig. 9 is a schematic view showing an embodiment of the flow of equipment used in the second embodiment (recovering coal dust utilization). Fig. 10 is a graph showing the change in zinc concentration with respect to the high zinc-containing ore blending ratio with respect to the mixed raw material in Example 2. [Main component symbol description] 1 Transfer furnace 098113608 39 201000640 2 Furnace body 2a Pre-tropical zone 2b Reduction zone 2c Melting zone 2d Cooling zone 3 Rotary hearth 4 Mixing material 5 Burner 6 Loading device 7 Discharge device 8 Cooling device 11 Ore Funnel 12 Coal hopper funnel 13 Slag material hopper 14 Mixer 15 Transfer furnace 16 Reduced iron discharge port 17 Filter bag dust collector 18 Powder transfer truck 19 Pump fan 20 Chimney 21 Recovery coal dust conveyor belt 098113608 40 201000640 21a 1st recycled coal dust conveying conveyor 21b 2nd recycling coal dust conveying conveyor 22 1st recycling coal dust storage funnel 23 Coal dust field 098113608 41

Claims (1)

201000640 七、申請專利範圍： 1. 一種還原鐵之製造方法，係包括有： 準備含有鐵礦(X)與石炭系固態還原材料之混合原料的步 驟’而該鐵礦(X)係含有含高鋅鐵礦(A)，該含高鋅鐵礦(a) 係含有鋅0.01mass〇/。以上、鐵SOmass。/。以上； 將上述混合原料裝載於爐床移動式爐的爐床上之混合原 料裝載步驟；以及 從爐床上部施行熱供應，而將移動式爐床上所裝載的混合 原料還原，獲得還原生成物的還原步驟。 2. 如申請專利範圍弟1項之還原鐵之製造方法，其中，上 述含局鋅鐵礦(A)係含有〇.〇1〜〇.5mass%的鋅與5〇〜7〇mass〇/0 的鐵。 3. 如申請專利範圍第1項之還原鐵之製造方法，其中，上 述含高鋅鐵礦(A)係相對於鐵礦(x)具有丨〇〜丨〇〇mass%的調 酉己比例。 4. 如申請專利範圍第丨項之還原鐵之製造方法，其中，上 述混合原料裝載步驟係將經成塊化之混合原料裝載於移動 式爐床上。 5. 如申請專利範圍第丨項之還原鐵之製造方法，其中，上 述還原步驟係將混合原料依120(TC以上的加熱溫度施行還 原而構成。 6·如申請專利範圍第5項之還原鐵之製造方法，其中，上 098113608 42 201000640 述加熱溫度係1250°C以上且未滿1400°C。 7_如申請專利範圍第1項之還原鐵之製造方法，其中上 述還原步驟係從爐床上部施行熱供應，而將移動式爐床上所 裝載的混合原料進行還原，使上述混合原料未熔融或者僅部 分熔融，而獲得還原鐵。 8. 如申請專利範圍第1項之還原鐵之製造方法，其中，更 進一步包括有從由上述爐床移動式爐所產生的煤塵中回收 / 粗氧化鋅的回收步驟； 、 . 上述準備原料的步驟係準備含有鐵礦(χ)、含鋅煤塵及碳 系固態還原材料的混合原料而構成；該鐵礦(χ)係含有含高 辞鐵礦(Α)，該含高辞鐵礦(Α)係含有鋅〇 〇lmass〇/〇以上、鐵 50mass%以上。 9. 如申請專利範圍第8項之還原鐵之製造方法，其中，上 述混合原料係具有〇.45mass%以上的平均鋅濃度。 (1G.如巾請專利範圍第9項之還原鐵之製造方法，其中， 上述平均鋅濃度係0.45〜〇.60mass%。 11. 如申明專利範圍第8項之還原鐵之製造方法’其中， 上述含鋅煤塵係從來自高爐的生賴塵、來自轉爐的生成煤 塵及來自電爐的生成煤塵所構成群組中選擇之至少】種煤 塵。 12. 如申μ專利|&圍第丨項之還原鐵之製造方法，其中， 更進步包括有將爐床移動式爐所生成的煤塵回收而獲得 098113608 43 201000640 回收煤塵的回收步驟； 上述準備原料的步驟係準備含有鐵礦(X)、上述回收煤塵 及碳系固態還原材料的混合原料而構成；該鐵礦⑻係含有 含高鋅鐵礦⑷，該含高鋅鐵礦(A)係含有辞⑽顧以以上 及鐵50mass%以上。 13. 如申請專利範圍第1項之還原鐵之製造方法，其中， 更進一步包括有： 將爐床移動式爐所生成㈣舒以回收之步驟； 將所回收的煤塵I載於上述移動式爐床上的步驟；以及 從該爐床上部進行熱供應，而從上述爐床㈣式爐所生成 的煤塵中獲得粗氧化辞的步驟。 14. 如申請專利範圍第〗項之還原鐵之製造方法，其中， 更進步包括有使上述還原生成物熔融的熔融步驟。 15♦如申請專利範圍® 1項之還原鐵之製造方法，其中’ 更進步包括有使上述還原生成物熔融的熔融步驟； 上述此合原料係含有鐵礦(X)、碳系固態還原材料及造渣 材料’ 4鐵礦(X)係含有含高鋅鐵礦(A)，該含高鋅鐵礦(A) 係含有辞〇.〇lmass%以上及鐵5〇画5%以上。 16. 如申睛專利範圍第14項之還原鐵之製造方法，其中， 上述炼融步驟係使上述還原生成物依14 0 〇 t：以上的加熱温 度熔融。 17. 如申請專利範圍第16項之還原鐵之製造方法，其中， 098113608 44 201000640 上述加熱溫度係1450°C以上且1500°C以下。 18. 如申請專利範圍第1項之還原鐵之製造方法，其中， 更進一步包括有： 使上述還原生成物熔融的熔融步驟；以及 從上述爐床移動式爐所生成的煤塵中回收粗氧化鋅的回 收步驟； 上述準備原料的步驟係準備含有鐵礦(X)、含鋅煤塵、碳 系固態還原材料及造渣材料的混合原料而構成；該鐵礦(X) 係含有含高鋅鐵礦（A)，該含高鋅鐵礦（A)係含有鋅 O.Olmass%以上、鐵 50mass%以上。 19. 如申請專利範圍第18項之還原鐵之製造方法，其中， 上述混合原料係具有0.45mass%以上的平均辞濃度。 20. 如申請專利範圍第19項之還原鐵之製造方法，其中， 上述平均辞濃度係0.45〜0.60mass%。 21. 如申請專利範圍第18項之還原鐵之製造方法，其中， 上述含鋅煤塵係從來自高爐的生成煤塵、來自轉爐的生成煤 塵及來自電爐的生成煤塵所構成群組中選擇之至少1種煤 塵。 22. 如申請專利範圍第1項之還原鐵之製造方法，其中， 更進一步包括有： 使上述還原生成物熔融的熔融步驟；以及 將爐床移動式爐生成的煤塵予以回收，而獲得回收煤塵的 098113608 45 201000640 回收步驟； 上述準備原料的步驟係準備含有鐵礦（X)、上述回收煤 塵、碳糸固悲运原材料及造〉查材料的混合原料而構成，該鐵 礦（X)係含有含高鋅鐵礦(A)，該含高鋅鐵礦(A)係含有鋅 0.0111^55%以上、鐵5〇1]1^3%以上。 23. 如申請專利範圍第1項之還原鐵之製造方法，其中， 更進一步包括有： 使上述還原生成物熔融的熔融步驟； 將爐床移動式爐所生成的煤塵予以回收之步驟； 將所回收的煤塵裝載於上述移動式爐床上的步驟；以及 從該爐床上部進行熱供應，而從上述爐床移動式爐所生成 的煤塵中獲得粗氧化鋅的步驟。 24. 如申請專利範圍第1項之還原鐵之製造方法，其中， 在上述混合原料裝載步驟之前，更進一步包括有：為了在移 動式爐床上裝載碳質材之外並且積層混合原料，而使碳質材 裝載於移動式爐床上的碳質材裝載步驟。 098113608 46201000640 VII. Patent application scope: 1. A method for manufacturing reduced iron, comprising: preparing a step of preparing a mixed raw material containing iron ore (X) and a carbonaceous solid reducing material, and the iron ore (X) containing high content Zinc-iron ore (A), which contains high zinc iron ore (a) contains zinc 0.01 mass 〇 /. Above, iron SOmass. /. The above; the mixed raw material loading step of loading the mixed raw material on the hearth of the hearth moving furnace; and performing heat supply from the hearth, and reducing the mixed raw materials loaded on the moving hearth to obtain reduction of the reduced product step. 2. The method for producing reduced iron according to the patent application scope, wherein the above-mentioned zinc-iron ore (A) contains 〇.〇1~〇.5mass% of zinc and 5〇~7〇mass〇/0 Iron. 3. The method for producing reduced iron according to the first aspect of the invention, wherein the high-zinc-containing iron ore (A) has a ratio of 丨〇 to 丨〇〇 mass% relative to iron ore (x). 4. The method of producing reduced iron according to the scope of the invention, wherein the mixed raw material loading step is to load the bulked mixed raw material on a mobile hearth. 5. The method for producing reduced iron according to the invention of claim 2, wherein the reducing step is carried out by subjecting the mixed raw material to reduction at a heating temperature of 120 (TC or higher). 6. The reduced iron according to item 5 of the patent application. The manufacturing method is the above, wherein the heating temperature is 1250 ° C or more and less than 1400 ° C. The manufacturing method of the reduced iron according to the first aspect of the patent application, wherein the reducing step is from the hearth The heat supply is performed, and the mixed raw materials loaded on the mobile hearth are reduced, and the mixed raw materials are not melted or partially melted to obtain reduced iron. 8. The method for producing reduced iron according to claim 1 of the patent scope, Further, the method further includes a step of recovering/reducing crude zinc oxide from the coal dust generated by the above-mentioned hearth moving furnace; and the step of preparing the raw material is prepared to contain iron ore (iron), zinc-containing coal dust, and carbon system. The solid state reducing material is composed of a mixed raw material; the iron ore (χ) system contains a high iron ore (Α) containing zinc 〇〇lmass〇/〇 The method of manufacturing the reduced iron according to the eighth aspect of the invention, wherein the mixed raw material has an average zinc concentration of 〇.45 mass% or more. (1G. The method for producing reduced iron according to the above aspect, wherein the average zinc concentration is 0.45 to 6060.% by mass. 11. The method for producing reduced iron according to claim 8 of the patent scope, wherein the zinc-containing coal dust is derived from a blast furnace At least the selected type of coal dust is selected from the group consisting of the dust generated from the converter and the coal dust generated from the electric furnace. 12. The method for manufacturing reduced iron according to the patent of the application of the invention, wherein The invention comprises the steps of recovering coal dust generated by the hearth moving furnace to obtain 098113608 43 201000640 recovery coal dust; the step of preparing the raw material is preparing a mixed raw material containing iron ore (X), the above-mentioned recovered coal dust and carbon-based solid reducing material. And the iron ore (8) contains high-zinc-iron ore (4), and the high-zinc-iron ore (A) contains more than 50% of the above and more than 50 mass% of iron. A method for producing reduced iron according to item 1, further comprising: a step of generating (4) a recovery by a hearth moving furnace; a step of loading the recovered coal dust I on the movable hearth; and a heat supply is provided on the hearth, and a step of obtaining a crude oxidation word from the coal dust generated by the above-mentioned hearth (four) type furnace. 14. The method for producing reduced iron according to the scope of the patent application, wherein further improvement includes The melting step of melting the above-mentioned reduction product. 15♦ The method for producing reduced iron according to the scope of application of the patent application, wherein the 'further progress includes a melting step for melting the reduced product; the raw material contains iron ore ( X), carbon-based solid reducing materials and slagging materials' 4 iron ore (X) contains high-zinc iron ore (A), which contains high-zinc iron ore (A) containing remarks. 〇lmass% or more and iron 5 draws more than 5%. 16. The method for producing reduced iron according to claim 14, wherein the refining step melts the reduced product at a heating temperature of 14 Torr or more. 17. The method for producing reduced iron according to item 16 of the patent application, wherein the heating temperature is 1400113608 44 201000640 and the heating temperature is 1450 ° C or higher and 1500 ° C or lower. 18. The method for producing reduced iron according to the first aspect of the invention, further comprising: a melting step of melting the reduced product; and recovering crude zinc oxide from the coal dust generated by the hearth moving furnace The step of preparing the raw material is prepared by preparing a mixed raw material containing iron ore (X), zinc-containing coal dust, a carbon-based solid reducing material, and a slag-forming material; the iron ore (X) contains high-zinc-iron ore. (A) The high-zinc-containing iron ore (A) contains zinc O. Olmass% or more and iron 50 mass% or more. 19. The method for producing reduced iron according to claim 18, wherein the mixed raw material has an average concentration of 0.45 mass% or more. 20. The method for producing reduced iron according to claim 19, wherein the average concentration is 0.45 to 0.60 mass%. 21. The method for producing reduced iron according to claim 18, wherein the zinc-containing coal dust is selected from the group consisting of coal dust generated from a blast furnace, coal dust generated from a converter, and coal dust generated from an electric furnace. Kind of coal dust. 22. The method for producing reduced iron according to the first aspect of the invention, further comprising: a melting step of melting the reduced product; and recovering coal dust generated by the hearth moving furnace to obtain recovered coal dust 098113608 45 201000640 Recovery step; The above steps of preparing raw materials are prepared by preparing a mixed raw material containing iron ore (X), the above-mentioned recovered coal dust, carbon stagnation material, and a material for inspection, and the iron ore (X) contains Containing high zinc iron ore (A), the high zinc iron ore (A) contains zinc 0.0111^55% or more and iron 5〇1]1^3% or more. 23. The method for producing reduced iron according to the first aspect of the invention, further comprising: a melting step of melting the reduced product; and a step of recovering coal dust generated by the hearth moving furnace; a step of loading the recovered coal dust on the moving hearth; and obtaining a heat supply from the hearth to obtain coarse zinc oxide from the coal dust generated by the hearth moving furnace. 24. The method for producing reduced iron according to claim 1, wherein, before the step of loading the mixed raw material, further comprising: in order to load the carbonaceous material on the mobile hearth and to laminate the raw materials A carbonaceous material loading step in which the carbonaceous material is loaded on a mobile hearth. 098113608 46
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