JPS63103012A - Production of molten iron containing chromium - Google Patents
Production of molten iron containing chromiumInfo
- Publication number
- JPS63103012A JPS63103012A JP24667986A JP24667986A JPS63103012A JP S63103012 A JPS63103012 A JP S63103012A JP 24667986 A JP24667986 A JP 24667986A JP 24667986 A JP24667986 A JP 24667986A JP S63103012 A JPS63103012 A JP S63103012A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- chromium
- tuyere
- powdered
- supplied
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 75
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 title claims description 72
- 239000011651 chromium Substances 0.000 title claims description 72
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000001301 oxygen Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000002893 slag Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 239000003575 carbonaceous material Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 5
- 239000012254 powdered material Substances 0.000 claims description 5
- 238000007664 blowing Methods 0.000 abstract description 8
- 238000003723 Smelting Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 2
- 239000000567 combustion gas Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- 238000006722 reduction reaction Methods 0.000 description 5
- 239000000571 coke Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000002801 charged material Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
- C21B13/0026—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide in the flame of a burner or a hot gas stream
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、電力を製錬用の・エネルギーとして使用する
ことなく含クロム溶銑を製造する方法において、クロム
源の一部としてクロム鉱石を使用しこのクロム鉱石の溶
融還元も同時に行えるようにした熱経済的な含クロム溶
銑の製造法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention uses chromium ore as part of the chromium source in a method for producing chromium-containing hot metal without using electricity as energy for smelting. This invention relates to a thermoeconomic method for producing chromium-containing hot metal that enables simultaneous reduction of chromium ore.
従来より、ステンレス鋼製造用の含クロム溶銑の製造法
としては、電気炉による方法が一つの技術体系を形成し
ている。この方法は、製鋼用アーク炉に、クロム源１
コークス、フラックスおよび必要に応じて副材料を装入
して溶解し、含クロム溶銑を得るものである。そのさい
のクロム源としては、高炭素フェロクロムが使用される
のが通常である、この高炭素フェロクロムを製造するの
にも電気炉が使用され、この場合にはクロム鉱石の半還
元ベレー／ ト等が使用されたり焼結鉱が使用されたり
する。この従来法によると電力消費量が非常に大きいの
で、近年、クロム鉱石を炭材等の還元材によって直接的
に溶融還元する方法の開発が推進されている。その傾向
としては１転炉によってクロム鉱石の溶融還元を行う方
間に注力されているようである１例えば特開昭５８−７
７５４８号公報。BACKGROUND ART Conventionally, as a method for producing chromium-containing hot metal for producing stainless steel, a method using an electric furnace has formed one technological system. In this method, a chromium source is added to a steelmaking arc furnace.
Coke, flux, and auxiliary materials as necessary are charged and melted to obtain chromium-containing hot metal. High carbon ferrochrome is usually used as the chromium source in this case. Electric furnaces are also used to produce this high carbon ferrochrome, and in this case, semi-reduced berets of chromium ore, etc. or sintered ore. Since this conventional method consumes a very large amount of electricity, in recent years there has been a push to develop a method for directly melting and reducing chromium ore using a reducing agent such as carbonaceous material. The trend seems to be to focus on methods of melting and reducing chromium ore using a converter.
Publication No. 7548.
特開昭５９−１４５７５８号公報、特開昭５９−１５０
０５９号公報、特開昭５９−１５００６０号公報、特開
昭５９−１５００６１号公報、特開昭５９−１５００６
２号公報等は転炉によるクロム鉱石の溶融還元を開示し
ている。また特開昭５０−１）６３１７号公報は特殊な
混合槽を使用してクロム鉱石の溶融還元を行う方法を開
示する。JP-A-59-145758, JP-A-59-150
059, JP 59-150060, JP 59-150061, JP 59-15006
Publication No. 2 and others disclose melting and reduction of chromium ore using a converter. Furthermore, Japanese Patent Application Laid-Open No. 1983-6317 discloses a method for melting and reducing chromium ore using a special mixing tank.
一方１本願と同一出願人に係る特願昭５９−１８２１９
号（特開昭６０−１６２７１８号公報）において、特殊
な竪型炉を使用し、この竪型炉の羽口にクロム源の一部
としての粉状のクロム鉱石を吹込むことによってその溶
融還元を図る方法を提案した。この出願人の提案に係る
竪型炉による方法の骨子は、炉の上部に原料装入口をそ
して炉の下部付近に上下二段の羽口をもつ竪型炉を用い
て含クロム溶銑を製造するものであり、上部の原料装入
口からクロム源、鉄源、炭材および造滓材を装入し、該
上下の羽口から熱風を吹込むと同時に０羽口から粉状ク
ロム鉱石および発熱材を炉内に供給することにより、こ
の粉状クロム鉱石を溶融還元しながら含クロム溶銑を得
るものである。On the other hand, Japanese Patent Application No. 18219/1989 filed by the same applicant as the present application
No. 60-162718), a special vertical furnace was used to melt and reduce powdered chromium ore as part of the chromium source by injecting it into the tuyeres of the vertical furnace. We proposed a method to achieve this. The gist of the method using a vertical furnace proposed by this applicant is to produce chromium-containing hot metal using a vertical furnace that has a raw material charging port in the upper part of the furnace and two stages of upper and lower tuyere near the bottom of the furnace. The chromium source, iron source, carbon material, and slag material are charged from the upper raw material charging port, and hot air is blown from the upper and lower tuyeres, and at the same time, powdered chromium ore and heat-generating material are charged from the zero tuyere. By supplying this powdered chromium ore into the furnace, chromium-containing hot metal is obtained while melting and reducing the powdered chromium ore.
また、この特開昭６０−１６２７１８号公報に提案した
方法を部分的に改善した含クロム溶銑の製造法を特願昭
６０−１９２７５１号、特願昭６１−９５８５号および
特願昭６１−９５８６号に提案した。In addition, a method for producing chromium-containing hot metal that is a partial improvement of the method proposed in JP-A-60-162718 has been disclosed in Japanese Patent Application No. 60-192751, Japanese Patent Application No. 61-9585, and Japanese Patent Application No. 61-9586. I proposed the issue.
本発明の目的とするところは、前記の特願昭５９−１８
２１９号（特開昭６０−１６２７１８号公報）に提案し
た竪型炉による含クロム溶銑製造法の一層の改善にあり
、具体的には、該竪型炉の上段羽口付近での粉体の融液
化挙動について未解決であった問題を解決して、クロム
鉱石を安定してしかも良好な熱効率のもとで溶融還元で
きるようにすることである。The object of the present invention is to
The purpose is to further improve the method for producing chromium-containing hot metal using a vertical furnace proposed in No. 219 (Japanese Unexamined Patent Publication No. 60-162718). The purpose of the present invention is to solve the unresolved problems regarding the melting behavior and to make it possible to melt and reduce chromium ore stably and with good thermal efficiency.
本発明は、炉の上部に原料装入口をそして炉の下部付近
に上下二段の羽口をもつ竪型炉を用いて含クロム溶銑を
製造するにさいし、該上部の原料装入口からクロム源、
鉄源、炭材および造滓材を装入し、該上下の羽口から高
温酸素富化空気を吹込むと同時に、上段羽口から粉状ク
ロム鉱石および粉状造滓材からなる粉状材料を炉内に供
給することにより、この粉状クロム鉱石を溶融還元しな
がら含クロム溶銑を製造する方法において。The present invention provides a method for producing chromium-containing hot metal using a vertical furnace having a raw material charging port in the upper part of the furnace and upper and lower tuyeres near the bottom of the furnace. ,
Iron source, carbon material, and slag material are charged, and high temperature oxygen-enriched air is blown from the upper and lower tuyeres, and at the same time, powdered material consisting of powdered chromium ore and powdered slag material is blown from the upper tuyere. In a method for producing chromium-containing hot metal while melting and reducing this powdered chromium ore by supplying it into a furnace.
上段羽口から炉内に供給する高温酸素富化空気の送風条
件と粉状材料の吹込み量を下記の条件式（１）を満足す
るように制御することを特徴とする。It is characterized by controlling the blowing conditions of high-temperature oxygen-enriched air supplied into the furnace from the upper tuyere and the amount of powdered material blown so as to satisfy the following conditional expression (1).
１３００≧（Ｑ ！ ＋ Ｑ ｌ ） ／ Ｗ Ｐ ≧
８３０ ・・（１まただし、Ｑｓは上段羽ロ一本か
ら炉内に供給する高温酸素富化空気の単位時間当りの顕
熱（ｋｃａｌ／ｍｉｎ） ＊ Ｑ 貢は上段羽口一本
から炉内に供給する高温酸素富化空気と炭材との単位時
間当りの反応熱（Ｋｃａｌ／■ｉｎ）、 そしてＷｐ
は上段羽ロ一本から炉内に供給する粉状材料の単位時間
当りの重！ｔ（Ｋｇ／ｍｉｎ）を表す。1300≧(Q!+Ql)/WP≧
830...(1 However, Qs is the sensible heat per unit time (kcal/min) of high-temperature oxygen-enriched air supplied into the furnace from one upper tuyere. The heat of reaction per unit time between the high temperature oxygen-enriched air supplied to the carbonaceous material (Kcal/■in), and Wp
is the weight of powdered material fed into the furnace from one upper impeller per unit time! t (Kg/min).
第１図に本発明法を実施する竪型炉の例を示した０図示
のように、この竪型炉は全体としては縦長のシャフトか
らなり、この炉の上部には、原料装入口１が、また下部
には、上段羽口（複数個）２と下段羽口（複数個）３と
からなる二段羽口が設けられている。４は熱風炉であり
、この熱風炉４で得られた熱風が各羽口２と３に供給さ
れる。Figure 1 shows an example of a vertical furnace for carrying out the method of the present invention.As shown in Figure 1, this vertical furnace consists of a vertically long shaft as a whole, and a raw material charging port 1 is installed in the upper part of the furnace. Further, in the lower part, two-stage tuyere consisting of upper tuyeres (plurality) 2 and lower tuyeres (plurality) 3 is provided. 4 is a hot air stove, and hot air obtained from this hot air stove 4 is supplied to each tuyere 2 and 3.
そのさい、酸素源５によって熱風に酸素を富化すること
ができるようになっている。上段羽口２にはこの高温酸
素富化空気と共に容器６内の粉状クロム鉱石１５と容器
７内の造滓材１６キヤリヤガス８によって供給され、こ
れらが上段羽口２から炉内に吹き込まれる。なお図にお
いて、ｌＯ〜１２は、クロム源としての高炭素フェロク
ロム、鉄源としての鋼屑、炭材としてのコークス、造滓
材としての石灰石や螢石などを収容する容器群であり、
これらの１炉頂装入原料は計量器１３によって所定の量
となるように計量されながら原料装入口１から炉内に装
入される。１７は出銑０．１８は生成した炉内含クロム
溶銑を示している。At this time, the hot air can be enriched with oxygen by the oxygen source 5. The high-temperature oxygen-enriched air is supplied to the upper tuyere 2 by powdered chromium ore 15 in a container 6, slag material 16 in a container 7, and carrier gas 8, and these are blown into the furnace from the upper tuyere 2. In the figure, 10~12 is a group of containers that contain high carbon ferrochrome as a chromium source, steel scrap as an iron source, coke as a carbon material, limestone and fluorite as a slag material,
These raw materials charged at the top of the furnace are charged into the furnace from the raw material charging port 1 while being weighed to a predetermined amount by a measuring device 13. 17 shows the tapped iron and 0.18 shows the generated chromium-containing hot metal in the furnace.
本発明者らは、このような竪型炉によるクロム鉱石の吹
き込みにさいし、上段羽口から炉内に吹込む粉状クロム
鉱石をどのようにしたら熱効率的に良好に且つ安定して
溶融還元せしめることができるかという点を重点項目に
して実験を重ねた。In blowing chromium ore into such a vertical furnace, the present inventors have investigated how to melt and reduce the powdered chromium ore, which is blown into the furnace from the upper tuyere, in a thermally efficient and stable manner. We conducted repeated experiments with a focus on whether it could be done.
上段羽口から炉内に吹き込まれた粉状クロム鉱石および
粉状造滓材は、下段羽口前のコークス燃焼領域で溶融し
、その溶融物がコークス充填層を滴下する間にクロム鉱
石が還元されることになるであろうが、この還元反応は
吸熱反応である。したがって、この部分へは適切な熱の
供給が必要となる０本発明者らは、上段羽口前と下段羽
口前で生成する燃焼ガスによって供給される熱量の総和
を一定としたうえで、下段羽口前の燃焼ガスによって供
給される熱量と上段羽口前の燃焼ガスによって供給され
る熱量との相対割合を変化させる実験を行った。Powdered chromium ore and powdered slag material injected into the furnace from the upper tuyere are melted in the coke combustion area in front of the lower tuyere, and while the melt drips down the coke packed bed, the chromium ore is reduced. However, this reduction reaction is endothermic. Therefore, it is necessary to supply appropriate heat to this part.The present inventors set the total amount of heat supplied by the combustion gas generated in front of the upper and lower tuyeres to be constant, and then An experiment was conducted in which the relative proportion of the amount of heat supplied by the combustion gas in front of the lower tuyere and the amount of heat supplied by the combustion gas in front of the upper tuyere was varied.
すなわち、上下段羽口前の燃焼ガスによる供給熱量は、
炉内に吹き込まれる高温酸素富化空気の顕熱Ｑ、と、こ
の高温酸素富化空気と炭材との反応２８Ｑ８との和であ
ると考えることができるが。In other words, the amount of heat supplied by the combustion gas before the upper and lower tuyeres is:
It can be considered that it is the sum of the sensible heat Q of the high-temperature oxygen-enriched air blown into the furnace and the reaction 28Q8 between this high-temperature oxygen-enriched air and the carbonaceous material.
上下段羽口前での燃焼ガスの供給熱量の全体量は一定と
なるように全体の高温酸素富化空気の送風条件を規制し
たうえ、下段羽口から吹き込む高温酸素富化空気の流量
、温度または酸素富化率を相対的に下げた場合には、こ
れに対応させて、上段羽口から吹き込む高温酸素富化空
気の流量、温度または酸素富化率を相対的に上げるとい
う上下羽口前での燃焼ガスによる供給熱量の相対変化を
与えながら、上段羽口から粉状クロム鉱石と粉状造滓材
からなる粉状材料を単位時間当りＷ、の量で吹き込みを
行う実験を行った。その実験結果の一例を第２図に示し
た。The overall blowing conditions of high-temperature oxygen-enriched air are regulated so that the total amount of heat supplied from the combustion gas in front of the upper and lower tuyeres remains constant, and the flow rate and temperature of the high-temperature oxygen-enriched air blown from the lower tuyeres are controlled. Alternatively, if the oxygen enrichment rate is relatively lowered, the flow rate, temperature, or oxygen enrichment rate of the high-temperature oxygen-enriched air blown from the upper tuyeres will be relatively increased. An experiment was conducted in which powdered material consisting of powdered chromium ore and powdered slag material was injected from the upper tuyere at an amount of W per unit time while giving a relative change in the amount of heat supplied by the combustion gas. An example of the experimental results is shown in FIG.
第２図は上段羽口での（Ｑｓ＋ＱＲ）／ＷＰでクロム収
率を整理したものである。第２図の横軸に示す（Ｑｓ＋
Ｑａ）／Ｗｐの値が大きくなることは、上段羽口前での
粉体の単位重量当りの燃焼ガスの熱量が大きくなること
であり、これに対応して、下段羽口前の燃焼ガスによる
熱量が相対的に小さくなることを示している。第２図に
見られるように、クロム収率は全体的に右下がりに低下
している。つまり、下段羽口前での燃焼ガスによる熱量
が相対的に小さくなるとクロム収率は低下してくる。そ
して、（Ｑｓ＋Ｑｌ）／ＷＦの値が１３００（Ｋｃａｌ
／にｇ）となるところを境にしてこの値を超えるとクロ
ム収率は急激に低下することがわかる。一方＋ （Ｑ
ｓ ＋ Ｑ ＊ ） ／ Ｗ ｒの値が約８００（Ｋｃ
ａｌ／Ｋｇ）となるところを境にしてこの値より小さく
なると粉状物質が羽口前で未溶融のまま滞留する現象が
生じて運転の続行が不可能になることがわかった。Figure 2 shows the chromium yield in terms of (Qs+QR)/WP at the upper tuyere. (Qs+
An increase in the value of Qa)/Wp means that the amount of heat of the combustion gas per unit weight of powder in front of the upper tuyere increases, and correspondingly, the amount of heat generated by the combustion gas in front of the lower tuyere increases. This shows that the amount of heat becomes relatively small. As seen in FIG. 2, the chromium yield is decreasing downward to the right as a whole. In other words, when the amount of heat generated by the combustion gas in front of the lower tuyere becomes relatively small, the chromium yield decreases. Then, the value of (Qs+Ql)/WF is 1300 (Kcal
It can be seen that when this value is exceeded, the chromium yield decreases rapidly. On the other hand + (Q
s + Q * ) / W r value is about 800 (Kc
It has been found that when the value becomes smaller than this value, a phenomenon occurs in which powdery substances remain unmelted in front of the tuyere, making it impossible to continue operation.
すなわち、（Ｑｓ ＋Ｑ訛）／Ｗ、が８００〜１３００
（Ｋｃａｌ／Ｋｇ）となるように、上段羽口の各々から
吹込む高温酸素富化空気の送風条件と粉状物質の量を制
御すれば粉状クロム鉱石の還元が安定して且つ良好に行
われることが判明した。この場合、上段羽口と下段羽口
から吹込む高温酸素富化空気の全体の量は装入物質の量
や種類によって成る値以上に規制することが必要となる
が、この全送風量を上段羽口と下段羽口に配分するさい
の配分割合を適切に調整することによって（ＱＳ ＋Ｑ
つ）／Ｗ、が８００〜１３００（Ｋｃａｌ／Ｋｇ）とな
るように制御するのが好適である。そのさい、 （Ｑｓ
＋Ｑ、ｌ）／Ｗ、の値が８００〜１３００（Ｋｃａｌ
／Ｋｇ）の範囲内であっても操業上許容できる範囲での
出来るだけ小さな値となるようにして下段羽口前での熱
量の供給を増大させるのがよい。すなわち、クロム鉱石
の溶融還元反応（吸熱反応）に要する熱量は主として下
段羽口から供給するのが望ましい。In other words, (Qs + Q accent)/W is 800 to 1300
(Kcal/Kg), the reduction of powdered chromium ore can be performed stably and well by controlling the blowing conditions of the high-temperature oxygen-enriched air blown from each upper tuyere and the amount of powdery material. It turned out that it was. In this case, it is necessary to regulate the total amount of high-temperature oxygen-enriched air blown from the upper and lower tuyeres to a value greater than or equal to the value determined by the amount and type of charged material; By appropriately adjusting the distribution ratio when distributing to the tuyere and lower tuyere (QS +Q
It is preferable to control the temperature so that the ratio (Kcal/Kg) is 800 to 1300 (Kcal/Kg). At that time, (Qs
+Q, l)/W, value is 800 to 1300 (Kcal
/Kg), it is preferable to increase the amount of heat supplied in front of the lower tuyeres so that the value is as small as possible within the operationally acceptable range. That is, it is desirable that the amount of heat required for the melting reduction reaction (endothermic reaction) of the chromium ore is mainly supplied from the lower tuyere.
実施例１
第１図に示したような炉内径がＯ，ｆｌ＋ｗの竪型炉で
あって、底部に一本の上段羽口と一本の下段羽口を取り
付けたの竪型炉の上部から、第１表に示すような量で炉
頂装入原料を装入し、上段羽口および下段羽口からそれ
ぞれ０．９Ｎ＋ｗ”／ｍｉｎおよび１．ＩＮ＋ｗ’／＋
＊ｉｎの流量で、温度が８００℃１酸素濃度が２８．５
％、１湿分が５ｇ／Ｎ＋ｗ’の高温酸素富化空気を炉内
に吹き込み、且つ上段羽口からは、第２表に示す粉末の
混合物を（Ｑ ｓ ＋ Ｃ＋＋） ／ Ｗ ？ −８６
８（Ｋｃａｌ／Ｋｇ）となる条件で炉内に吹き込んだ、
粉体の滞留は認められず、安定して含クロム溶銑を製造
できた。Example 1 A vertical furnace with an inner diameter of O, fl+w as shown in Fig. 1, with one upper tuyere and one lower tuyere attached to the bottom. , the top charging material was charged in the amount shown in Table 1, and the flow rate was 0.9N+w"/min and 1.IN+w'/+ from the upper and lower tuyeres, respectively.
*In flow rate, temperature is 800℃ 1 oxygen concentration is 28.5
%, high temperature oxygen-enriched air with a moisture content of 5 g/N+w' was blown into the furnace, and from the upper tuyere, a mixture of powders shown in Table 2 was added (Q s + C++) / W ? -86
8 (Kcal/Kg) into the furnace,
No powder retention was observed, and chromium-containing hot metal could be produced stably.
この結果として、出滓口から取り出されたスラグ中の未
還元クロム濃度は０．８％、またクロムの収率は９７．
２％と良好にクロム鉱石の溶融還元を行うことができ、
第３表に示すような組成の含クロム溶銑を得ることがで
きた。As a result, the unreduced chromium concentration in the slag taken out from the slag port was 0.8%, and the chromium yield was 97%.
It is possible to melt and reduce chromium ore with a good rate of 2%.
It was possible to obtain chromium-containing hot metal having the composition shown in Table 3.
第１表（炉頂装入原料）
第２表（上段羽口吹き込み物質）
第３表（含クロム溶銑の組成 重量％）実施例２
上段羽口からの高温酸素富化空気の吹き込み流量を１．
１Ｎｍ”／ｍｉｎ、下段羽口からの高温酸素富化空気流
量を０．９Ｎｍ’／ｓｉｎとし、 （Ｑ ｓ ＋ Ｑ
＊） ／ Ｗ ？＝ １０６１（Ｋｃａｌ／にｇ）
とした以外は、実施例１と同一の条件で含クロム溶銑を
製造した。本例でも第４表に示す組成の含クロム溶銑を
安定して製造できたが、スラグ中の未還元クロム濃度は
１．３％となり、クロム収率は９５．７％であった。Table 1 (Materials charged at the top of the furnace) Table 2 (Materials blown into the upper tuyere) Table 3 (Composition of chromium-containing hot metal, weight %) Example 2 The flow rate of high-temperature oxygen-enriched air from the upper tuyere was set at 1 ．．
1Nm''/min, the flow rate of high-temperature oxygen-enriched air from the lower tuyere is 0.9Nm'/sin, (Q s + Q
*) / W? = 1061 (Kcal/g)
Chromium-containing hot metal was produced under the same conditions as in Example 1 except for the following. In this example as well, chromium-containing hot metal having the composition shown in Table 4 was stably produced, but the unreduced chromium concentration in the slag was 1.3% and the chromium yield was 95.7%.
第４表（含クロム溶銑の組成 重量％）実施例３（比較
例）
上段羽口からの高温酸素富化空気の吹き込み流量を１．
５Ｎｍ、’／ｍｉｎ、下段羽口からの高温酸素富化空気
流量を０．５Ｎｍ３／ｓ＋ｉｎとし、（Ｑ ｓ ” Ｃ
＋＋） ／ Ｗ ？＝ １４６０（Ｋｃａｌハｇ）と
した以外は、実施例１と同一の条件で含クロム溶銑を製
造した。炉外に排出されたスラグ中には未還元クロムが
２．９％含有されており、クロム収率は９０．４％であ
った。本例で得られた含クロム溶銑の組成を第５表に示
したが。Table 4 (Composition of chromium-containing hot metal, weight %) Example 3 (comparative example) The flow rate of high-temperature oxygen-enriched air from the upper tuyere was set at 1.
5Nm, '/min, the flow rate of high-temperature oxygen-enriched air from the lower tuyere is 0.5Nm3/s+in, (Q s "C
++) / W? Chromium-containing hot metal was produced under the same conditions as in Example 1, except that = 1460 (Kcal hag). The slag discharged outside the furnace contained 2.9% unreduced chromium, and the chromium yield was 90.4%. The composition of the chromium-containing hot metal obtained in this example is shown in Table 5.
含クロム溶銑中の（Ｓｉ）は１．８％となり、実施例１
に比べて高い値を示した。(Si) in the chromium-containing hot metal was 1.8%, and in Example 1
It showed a higher value compared to .
第５表（含クロム溶銑の組成 重量％）実施例４（比較
例）
上段羽口からの高温酸素富化空気の吹き込み流量を０．
７Ｎ＋ｍ”／ｍｉｎ＋ 下段羽口からの高温酸素富化空
気流量を１．３Ｎｍ”／ｓｉｎとし、（ＱＳ＋Ｑｌ）／
ＷＰ＝ ６７５（Ｋｃａｌ／Ｋｇ） とした以外は、実
施例１と同一の条件で含クロム溶銑を製造を試みた。し
かし。Table 5 (Composition of chromium-containing hot metal, weight %) Example 4 (comparative example) The flow rate of high-temperature oxygen-enriched air from the upper tuyere was set at 0.
7N+m”/min+ The flow rate of high-temperature oxygen-enriched air from the lower tuyere is 1.3Nm”/sin, (QS+Ql)/
An attempt was made to produce chromium-containing hot metal under the same conditions as in Example 1 except that WP = 675 (Kcal/Kg). but.
上段羽口前に粉体が滞留したので含クロム溶銑の製造は
不可能となった。Powder remained in front of the upper tuyere, making it impossible to produce chromium-containing hot metal.
第１図は本発明法に実施するのに好適な竪型炉の略断面
図、第２図は本発明法に従って制御する（Ｑｓ＋Ｑ＊）
／ＷＰとクロム収率との関係図である。
１・・炉上部の原料装入口、２・・上段羽口。
３・・下段羽口、４・・熱風炉、５・・酸素源。
１５・・粉状クロム鉱石、１６・・造滓材。Figure 1 is a schematic cross-sectional view of a vertical furnace suitable for implementing the method of the present invention, and Figure 2 is a furnace controlled according to the method of the present invention (Qs+Q*).
FIG. 2 is a diagram showing the relationship between /WP and chromium yield. 1. Raw material charging inlet at the top of the furnace, 2. Upper tuyere. 3. Lower tuyere, 4. Hot blast furnace, 5. Oxygen source. 15... Powdered chromium ore, 16... Slag material.
Claims (1)
の羽口をもつ竪型炉を用いて含クロム溶銑を製造するに
さいし、該上部の原料装入口からクロム源、鉄源、炭材
および造滓材を装入し、該上下の羽口から高温酸素富化
空気を吹込むと同時に上段羽口から粉状クロム鉱石およ
び粉状造滓材からなる粉状材料を炉内に供給することに
より、該粉状クロム鉱石を溶融還元しながら含クロム溶
銑を製造する方法において、 該上段羽口から炉内に供給する高温酸素富化空気の送風
条件と粉状材料の吹込み量を下記の条件式（１）を満足
するように制御することを特徴とする含クロム溶銑の製
造法、 １３００≧（Ｑ＿３＋Ｑ＿Ｒ）／Ｗ＿Ｐ≧８３０・・（
１）ただし、Ｑ＿３は上段羽口一本から炉内に供給する
高温酸素富化空気の単位時間当りの顕熱（Ｋｃａｌ／ｍ
ｉｎ）、Ｑ＿Ｒは上段羽口一本から炉内に供給する高温
酸素富化空気と炭材との単位時間当りの反応熱（ｋｃａ
ｌ／ｍｉｎ）、そしてＷ＿Ｐは上段羽口一本から炉内に
供給する粉状材料の単位時間当りの重量（Ｋｇ／ｍｉｎ
）を表す。[Claims] When producing chromium-containing hot metal using a vertical furnace having a raw material charging port in the upper part of the furnace and upper and lower tuyeres near the bottom of the furnace, A chromium source, iron source, carbon material, and slag material are charged, and high-temperature oxygen-enriched air is blown through the upper and lower tuyeres.At the same time, powder consisting of powdered chromium ore and powdered slag material is blown from the upper tuyere. In the method of producing chromium-containing hot metal while melting and reducing the powdered chromium ore by supplying powdered chromium ore into the furnace, A method for producing chromium-containing hot metal, characterized by controlling the amount of blown metal such that it satisfies the following conditional expression (1), 1300≧(Q_3+Q_R)/W_P≧830...(
1) However, Q_3 is the sensible heat per unit time (Kcal/m
in), Q_R is the reaction heat per unit time (kca
l/min), and W_P is the weight per unit time (Kg/min) of the powdered material fed into the furnace from one upper tuyere.
) represents.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24667986A JPS63103012A (en) | 1986-10-17 | 1986-10-17 | Production of molten iron containing chromium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24667986A JPS63103012A (en) | 1986-10-17 | 1986-10-17 | Production of molten iron containing chromium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63103012A true JPS63103012A (en) | 1988-05-07 |
Family
ID=17152004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24667986A Pending JPS63103012A (en) | 1986-10-17 | 1986-10-17 | Production of molten iron containing chromium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63103012A (en) |
-
1986
- 1986-10-17 JP JP24667986A patent/JPS63103012A/en active Pending
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