JPS6326307A - Molded sic lump - Google Patents
Molded sic lumpInfo
- Publication number
- JPS6326307A JPS6326307A JP61168860A JP16886086A JPS6326307A JP S6326307 A JPS6326307 A JP S6326307A JP 61168860 A JP61168860 A JP 61168860A JP 16886086 A JP16886086 A JP 16886086A JP S6326307 A JPS6326307 A JP S6326307A
- Authority
- JP
- Japan
- Prior art keywords
- sic
- cast iron
- cupola
- iron
- molded
- 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
- 239000000843 powder Substances 0.000 claims abstract description 49
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000000654 additive Substances 0.000 claims abstract description 24
- 230000000996 additive effect Effects 0.000 claims abstract description 24
- 229910052742 iron Inorganic materials 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 26
- 150000001875 compounds Chemical class 0.000 claims description 8
- 229910001018 Cast iron Inorganic materials 0.000 abstract description 12
- 238000002844 melting Methods 0.000 abstract description 10
- 230000008018 melting Effects 0.000 abstract description 10
- 239000002994 raw material Substances 0.000 abstract description 8
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 239000000571 coke Substances 0.000 abstract description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract 2
- 229910052681 coesite Inorganic materials 0.000 abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract 2
- 239000000377 silicon dioxide Substances 0.000 abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- 229910052682 stishovite Inorganic materials 0.000 abstract 2
- 229910052905 tridymite Inorganic materials 0.000 abstract 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract 1
- 235000010216 calcium carbonate Nutrition 0.000 abstract 1
- 238000002156 mixing Methods 0.000 description 8
- 239000002893 slag Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 229910000805 Pig iron Inorganic materials 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229910017384 Fe3Si Inorganic materials 0.000 description 1
- 229910015364 Fe5Si3 Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、鋳鉄等の溶解操業において合金添加材として
用いられるＳｉＣ成型塊に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a SiC molded ingot used as an alloy additive in melting operations for cast iron and the like.
（従来の技術）
近年、キュポラ操業において、溶融鋳鉄中のＣ９Ｓｉの
成分調整用添加原料としてＳｉＣが注目されている。こ
れは、キュポラにＳｉＣを添加すると、ＳｉＣが合金元
素であるＣ、 Ｓｉ源となるだけでなく、溶湯の精錬お
よび温度上昇等の効果があると言われているためである
。(Prior Art) In recent years, SiC has attracted attention as an additive raw material for adjusting the composition of C9Si in molten cast iron in cupola operations. This is because it is said that when SiC is added to the cupola, it not only serves as a source of alloying elements C and Si, but also has effects such as refining the molten metal and increasing the temperature.
キュポラに添加するＳｉＣ材は、人頭大の塊から微粒の
状態で製造されるが、製造塊はそれ自体強度が弱いため
、粒径５曹璽以下にして、セメント等の無機粘結剤をバ
インダとして５〜１５ｃｍの大きさの立方体や豆炭形に
成型し、このＳｉＣ成型塊をキュポラ等への装入原料と
している。The SiC material added to cupolas is produced in the form of head-sized lumps or fine particles, but the produced lumps themselves have low strength, so the particle size is reduced to 5 mm or less, and an inorganic binder such as cement is added to the SiC material. As a binder, it is molded into a cube or charcoal shape with a size of 5 to 15 cm, and this molded SiC lump is used as a raw material for charging into a cupola or the like.
（発明が解決しようとする問題点）
キュポラ内に装入されたＳｉＣ成型塊は、自ら溶けるこ
とはなく （ＳｉＣは２７００°ＣでＣとＳｉに分解
する）、成型塊中のＳｉＣが熔解した鉄と接触すること
によって共晶反応が生して溶鉄中に溶は込んでいく。(Problem to be solved by the invention) The molded SiC lump charged in the cupola does not melt by itself (SiC decomposes into C and Si at 2700°C), and the SiC in the molded lump melts. When it comes into contact with iron, a eutectic reaction occurs and it melts into the molten iron.
従って、ＳｉＣ成型塊は、キュポラ内で滴下する溶鉄に
接するか否かによって、溶鉄中へのＳｉ、 Ｃの熔は込
み量が変化し、溶鉄の成分が安定せず、溶鉄への吸収歩
留も悪くなる。更に、長ｊＩＪ１間の連続操業を実施し
た場合、未反応のＳｉＣ塊がヘッドコークス中に多数混
入して炉況を不安定にする事態を招来する結果となる。Therefore, depending on whether or not the SiC molded lump comes into contact with the molten iron dripping in the cupola, the amount of Si and C injected into the molten iron changes, the components of the molten iron are not stabilized, and the absorption yield into the molten iron is reduced. It also gets worse. Furthermore, if continuous operation is carried out for a long period of time, a large number of unreacted SiC lumps will be mixed into the head coke, resulting in an unstable furnace condition.
本発明はかかる問題に鑑みなされたもので、キュポラ等
の熔解炉操業において、溶湯への吸収効率が高くかつ安
定したＳｉＣ成型塊を提供することを目的とする。The present invention was made in view of this problem, and an object of the present invention is to provide a SiC molded lump that has high absorption efficiency into molten metal and is stable in operation of a melting furnace such as a cupola.
（問題点を解決するための手段）
軟土の目的を達成するために講じられた本発明のＳｉＣ
成型塊の特徴とするところは、ＳｉＣ粉粒に高ＩｊＬ還
元雰囲気で溶融鉄を生成する添加材粉粒を混在させた点
にある。(Means for solving the problems) SiC of the present invention taken to achieve the purpose of soft soil
The feature of the molded lump is that SiC powder is mixed with additive powder that produces molten iron in a high IjL reducing atmosphere.
（実施例）
本発明に係るＳｉＣ成型塊は、ＳｉＣ粉粒に高温還元雰
囲気で溶融鉄を生成する添加材粉粒が混在して成型され
たものである。(Example) The SiC molded lump according to the present invention is formed by mixing SiC powder with additive powder that generates molten iron in a high-temperature reducing atmosphere.
ＳｉＣ粉粒は、既述の通り、別途製造された塊状のｓｔ
ｃ＋Ｊを粉砕したものであり、望ましくば、成型性およ
び溶解容易性から５＋＋ｎ以下にしたものである。勿論
、ＳｉＣ材の製造過程で生じた粉粒も用いられる。As mentioned above, the SiC powder particles are separately manufactured in the form of lumps of st.
It is obtained by pulverizing c+J, and preferably has a particle size of 5++n or less in view of moldability and ease of dissolution. Of course, powder particles produced during the manufacturing process of the SiC material can also be used.
前記ＳｉＣ材は、ＳｉＣ成分が重量％で５０〜９５％程
度のものまでいろいろ供給されているが、本発明におい
てはいずれの種類のものでも使用できる。Various types of SiC materials are available, ranging from 50 to 95% by weight of the SiC component, but any type of material can be used in the present invention.
尚、他の成分は、主としてＳｉＯ□、 ＦｒｅｅＣ，Ｓ
であり、通常ＳｉＣ成分が低くなるほど５ｉ０２成分が
増大する傾向にある。因みに、−分析例を紹介すると、
ＳｉＣ５０％−３ｉＯ□１５．３％、ＳｉＣ７０％−３
Ｉ０２１１゜７％、ＳｉＣ９３％−３ｉｎ２Ｑ、９％で
ある。In addition, other components are mainly SiO□, FreeC,S
Generally, the lower the SiC component, the more the 5i02 component tends to increase. By the way, - to introduce an analysis example,
SiC50%-3iO□15.3%, SiC70%-3
I0211°7%, SiC93%-3in2Q, 9%.
前記ＳｉＣ粉粒に添加される添加材粉粒は、キュポラ等
の溶解炉内の高温還元雰囲気下で溶融鉄を生成すること
ができるものであり、例えば鋼材、鋳鉄材、酸化鉄等の
鉄材の粉粒を例示することができる。The additive powder added to the SiC powder is capable of producing molten iron in a high-temperature reducing atmosphere in a melting furnace such as a cupola. An example is powder particles.
添加材粉粒の大きさは、成型性、均一分散性、溶解容易
性からＳｉＣ粉粒と同程以下、望ましくは粒径３菖薦以
下とされる。The size of the additive powder particles is set to be the same or smaller than that of the SiC powder particles, preferably 3 mm or less, from the viewpoint of moldability, uniform dispersibility, and ease of dissolution.
添加材粉粒とＳｉＣ粉粒との混合割合は、成型塊が溶解
炉投入作業用マグネットに吸着する程度であればよく、
通常、添加材粉粒が重量％で４０％以」二とするが、特
に限定されない。尚、添加材を酸化鉄とした場合、Ｆｅ
３１］４（マグネタイト）であればマグネットに吸着す
るので問題ないが、Ｆｅ２Ｏ＋等の吸着しないものにつ
いては、他の搬送手段で炉内へ装入すればよい。The mixing ratio of the additive powder and the SiC powder may be such that the molded lump is adsorbed to the magnet for feeding into the melting furnace.
Usually, the amount of additive powder particles is 40% or more by weight, but there is no particular limitation. In addition, when the additive is iron oxide, Fe
31] 4 (magnetite), there is no problem since it is adsorbed by the magnet, but materials that do not adsorb, such as Fe2O+, may be charged into the furnace using other conveyance means.
軟土の通り、添加材粉粒の混合割合は、自在に決定する
ことができるが、望ましくは、ＳｉＣ中のＳｉと添加材
粉粒中のＦｅとが融点の低いＦｅ−５ｉを生成できる範
囲に決定する方が、熔解歩留りの向」二を期待できる。As with soft soil, the mixing ratio of the additive powder particles can be determined freely, but it is preferably within a range where Si in SiC and Fe in the additive powder particles can generate Fe-5i with a low melting point. If you decide to do this, you can expect to see an improvement in the melting yield.
前記Ｆｅ−５ｉとしては、Ｆｅ３Ｓｉ （１４゜４％Ｓ
ｉ） 、Ｆｅ５５ｉ３（２３，２％Ｓｉ） 、Ｆｅ５ｉ
２（５０，５％Ｓｉ）を挙げることができる。As the Fe-5i, Fe3Si (14°4%S
i), Fe55i3 (23,2%Si), Fe5i
2 (50.5% Si).
例えば、Ｆｅ５Ｓｉ３を狙って配合する場合について説
明すると次の通りである。ＳｉＣ粉粒として、ＳｉＣ純
度７０％（２１％Ｃ１４９％Ｓｉ ）のＳｉＣ材粉粒を
用い、添加材粉粒として、４．２％Ｃ，１，０％Ｓｉの
鋳鉄材粉粒を用いた場合、添加材粉粒の配合割合をＸ％
とすると、下記式が成立し、
１．０Ｘ＋４９（１００−Ｘ） −２３，２ｘ １
００Ｘ＝５３．８％が決定される。For example, the case where Fe5Si3 is targeted for blending will be explained as follows. When using SiC powder with a SiC purity of 70% (21%C, 149%Si) as the SiC powder, and using cast iron powder with 4.2%C and 1.0%Si as the additive powder. , the blending ratio of additive powder particles is X%
Then, the following formula is established, 1.0X+49(100-X) -23,2x 1
00X=53.8% is determined.
尚、添加材粉粒として、酸化鉄粉粒を用いた場合は、例
えば下記式のように
Ｆｅ３０４＋ＳｉＣ→Ｆｅ−１−３ｉ０２＋Ｃ３ｉＣ中
のＳｉが還元剤として用いられるので、この分を考慮し
て配合割合を決定する必要がある。In addition, when iron oxide powder is used as the additive powder, Si in Fe304+SiC→Fe-1-3i02+C3iC is used as a reducing agent as shown in the following formula, so take this into account when adjusting the blending ratio. need to be determined.
上記ＳｉＣ粉粒と添加材粉粒とを均一に混合した後、成
型塊に成型される。成型された成型塊の大きさは、自由
に決定することができるが、通常５０〜１２０ ｖｓｖ
ｓ程度とされる。尚、キュポラに投入する場合では、炉
径の１／１０程度がよいと言われている。After the SiC powder and the additive powder are uniformly mixed, they are molded into a molded lump. The size of the molded lump can be determined freely, but is usually 50 to 120 vsv
It is said to be about s. In addition, when charging into a cupola, it is said that about 1/10 of the diameter of the furnace is good.
ところで、ＳｉＣ粉粒のＳｉＣ純度が低い場合、既述し
た通り、不純物として５ｉｏ２が多く含有される。By the way, when the SiC purity of the SiC powder is low, as described above, a large amount of 5io2 is contained as an impurity.
Ｓｉｎ□が多く含有していると、溶解炉内で高融点の５
ｉ０２系スラグが生成する。このスラグは流動性が悪い
ので、コークスやＳｉＣの表面に付着し易く、コークス
の燃焼性やＳｉＣの共晶反応を阻害する。If a large amount of Sin□ is contained, the high melting point of 5
i02 series slag is generated. Since this slag has poor fluidity, it easily adheres to the surface of coke and SiC, inhibiting the combustibility of coke and the eutectic reaction of SiC.
その結果、キュポラの炉況を悪化させる傾向を生じる。As a result, there is a tendency to deteriorate the furnace condition of the cupola.
これを防止するためには、スラグの流動性を上げること
が必要であり、本発明においては、ＳｉＣ粉粒中の５ｉ
０２の作用を中和するためにＣａ化合物を用い、添加材
粉粒として、鉄材粉粒とＣａ化合物粉粒との混合粉粒を
用いる。In order to prevent this, it is necessary to increase the fluidity of the slag, and in the present invention, it is necessary to increase the fluidity of the slag.
In order to neutralize the effect of 02, a Ca compound is used, and a mixed powder of iron material powder and Ca compound powder is used as the additive powder.
Ｃａ化合物としては、ＣａＯやＣａＣ０３を例示するこ
とができ、その添加量はＣａＯに換算して、重量比でＣ
ａＯ／５ｉＯ２＝ ０．７〜１．０とするのがよい。０
．７未満ではスラグの流動性改善の効果が少なく、−方
、１．０を越えると、溶解炉の操業が塩基性操業となり
、酸化したＳｉがＣで還元されずに、５ｉｎ２がＣａＯ
と結合してしまいＳｉの合金化が妨げられ、ＳｔＣのＳ
ｉ歩留が悪化する。Examples of Ca compounds include CaO and CaC03, and the amount added is calculated as CaO in terms of weight ratio.
It is preferable that aO/5iO2=0.7 to 1.0. 0
．． If it is less than 7, the effect of improving the fluidity of slag will be small; if it exceeds 1.0, the operation of the melting furnace will become basic, and oxidized Si will not be reduced by C, and 5in2 will become CaO.
This prevents the alloying of Si, and the S of StC
i Yield deteriorates.
尚、前記Ｃａ化合物の添加量の算定基準となる５ｉ０２
は、厳密に言えば、溶鉄の精錬におけるスラグ中の５ｉ
０２量ということになり、ＳｉＣ粉粒中の５ｉＯｉのほ
かに、ＳｉＣが溶鉄を精錬することによって発生する５
ｉ０２量も考慮しなければならないが、後者の量は実際
上微量であり、前者の５ｈｏ２量だけで十分実用的であ
る。In addition, 5i02 is the calculation standard for the amount of Ca compound added.
Strictly speaking, 5i in slag in molten iron refining is
In addition to the 5iOi in the SiC powder, the amount of 5iOi generated by SiC refining molten iron is
Although the amount of i02 must also be taken into consideration, the latter amount is actually very small, and the former amount of 5ho2 alone is sufficient for practical use.
Ｃａ化合物の配合例を挙げると下記の通りである。Examples of the combination of Ca compounds are as follows.
ＳｉＣ粉粒として、ＳｉＣ７０％−５ｉ０２量２％のも
のを用い、Ｃａｂ／ ５ｉＯｚ−０，７とするとＣａｂ
／１２％＝０．７
これによりＣａＯ−８，４％を得る。従って、ＳｉＣに
対して８．４％のＣａＯ粉粒を添加すればよい。As SiC powder particles, if SiC70%-5i02 amount 2% is used and Cab/5iOz-0,7 is used, Cab
/12%=0.7 This gives CaO-8.4%. Therefore, it is sufficient to add 8.4% of CaO powder to SiC.
この場合、Ｃａ化合物としてＣａＣ０３を用いるとする
と、分子量の割合で
となり、ＳｉＣに対して１５％のＣａＣ０３を添加すれ
ばよい。In this case, if CaC03 is used as the Ca compound, the molecular weight ratio is as follows, and it is sufficient to add 15% of CaC03 to SiC.
次に本発明に係るＳｉＣ成型塊を用いたキュポラ操業実
施例について、従来のＳｉＣ粉粒のみからなる成型塊を
用いた場合と比較して説明する。Next, an example of cupola operation using the SiC molded lump according to the present invention will be described in comparison with a case where a conventional molded lump made only of SiC powder particles is used.
ｆｌ、ｌ 使用したＳｉＣ成型塊
■実施例
ＳｉＣ粉粒・・・ ＳｉＣ純度７０％のＳｉＣ材の粉砕
粒（粒径３ｍｍ以下）を使用
添加材粉粒−Ｃ４，２％、Ｓｉ １．０％、Ｍｎ ０．
６％、残部実質的にＦｅの銑鉄の粉砕粒（
粒径３ ａｍ以下）を使用
配合比 ・・・ ＳｉＣ粉粒５ｏ％、添加材粉粒５ｏ％
成型塊の大きさ・・・１００ｍｍφＸ １００ ｍｍ
ｋｌの円柱形■従来例
■で挙げたＳｉＣ粉粒のみを使用して、１００龍φＸ１
００＋ｎｈの円柱形に成型した。fl, l SiC molded lump used ■Example SiC powder granules...Crushed granules of SiC material with SiC purity of 70% (particle size 3 mm or less) were used Additive powder granules - C4.2%, Si 1.0% , Mn 0.
6%, the balance is essentially Fe crushed pig iron particles (particle size 3 am or less).Blending ratio: 50% SiC powder, 50% additive powder.
Size of molded lump...100mmφX 100mm
kl cylindrical shape ■ Conventional example ■ Using only the SiC powder particles, 100 dragon
It was molded into a cylindrical shape of 00+nh.
（２）キュポラ装入原料および配合（重量％）・・・第
１表に示す。(2) Cupola charging raw materials and composition (wt%)...shown in Table 1.
次 葉
第 １ 表
（３） 操業結果
出銑が安定した後、５時間に亘って２０分毎（サンプリ
ング総数１５）に、出銑温度、出銑Ｃ％、出銑Ｓｔ％に
ついて調べた。その結果を第２表に示す。Table 1 (3) Operation results After the tapping became stable, the tapping temperature, tapping C%, and tapping St% were investigated every 20 minutes for 5 hours (total number of samples: 15). The results are shown in Table 2.
第２表
第２表より、実施例は従来例に比べて、成分のバラツキ
が小さくなっていることが確認された。Table 2 From Table 2, it was confirmed that the variations in the components were smaller in the examples than in the conventional examples.
また、第１表および第２表に基づいて、Ｓｉ歩留を下記
の計算式により算出した。Furthermore, based on Tables 1 and 2, the Si yield was calculated using the following formula.
又
Ｓｉ歩留＝ −Ｘ１００％
ここに、Ｘは全原料中のＳｉ含有量（χ）であり、Ｘ＝
Σ（原料中のＳｉ％）×（その原料の配合％）
又は第２表中の平均Ｓｔ％を示す。Also, Si yield = -X100% Here, X is the Si content (χ) in the total raw material, and X =
Σ (Si% in the raw material) x (blending % of the raw material) or the average St% in Table 2 is shown.
尚、原料中のＳｉ含有量は次の通りである。Incidentally, the Si content in the raw materials is as follows.
銑鉄１．０％、故銑１．７％、鋼屑０．１％ＳｉＣ成型
塊（実施例）２５％
（従来例）４９％
計算結果は、実施例８５％、従来例８１％であり、本発
明のＳｉＣ成型塊を用いた場合、Ｓｉ歩留の向上が確認
された。Pig iron 1.0%, waste pig iron 1.7%, steel scrap 0.1% SiC molded ingot (example) 25% (conventional example) 49% The calculation results are 85% in the example and 81% in the conventional example, When the SiC molded lump of the present invention was used, it was confirmed that the Si yield was improved.
（発明の効果）
以上説明した通り、本発明のＳｉＣ成型塊は、ＳｉＣ粉
粒に高温還元雰囲気で溶融鉄を生成する添加材粉粒が混
在しているので、溶解炉中で添加材粉粒より生じた溶解
鉄がＳｉＣ粉粒に極めて容易に接触し、ＳｉＣとＦｅと
の共晶反応を促進させることができ、溶鉄中のＣ，Ｓｉ
成分の安定化、吸収歩留の向上に資することができ、延
いては炉況の安定した操業を図ることができ、当分野に
おける利用価値は著大である。(Effects of the Invention) As explained above, the SiC molded lump of the present invention contains SiC powder mixed with additive powder that generates molten iron in a high-temperature reducing atmosphere. The molten iron generated from the molten iron contacts the SiC powder very easily, promoting the eutectic reaction between SiC and Fe.
It can contribute to stabilizing the components and improving the absorption yield, which in turn allows stable operation of the furnace, and has great utility value in this field.
Claims (4)
いて、ＳｉＣ粉粒に高温還元雰囲気で溶融鉄を生成する
添加材粉粒が混在していることを特徴とするＳｉＣ成型
塊。(1) A SiC molded lump in which SiC powder particles are molded into a lump shape, characterized in that the SiC powder particles are mixed with additive powder particles that generate molten iron in a high-temperature reducing atmosphere.
許請求の範囲第１項記載のＳｉＣ成型塊。(2) The SiC molded ingot according to claim 1, wherein the additive powder particles are iron powder particles.
ことを特徴とする特許請求の範囲第１項記載のＳｉＣ成
型塊。(3) The SiC molded lump according to claim 1, wherein the additive powder particles are iron material powder particles and Ca compound powder particles.
有量に対してＣａＯに換算して重量比でＣａＯ／ＳｉＯ
＿２が０．７〜１．０となる範囲で添加されていること
を特徴とする特許請求の範囲第３項記載のＳｉＣ成型塊
。(4) The Ca compound is calculated as CaO/SiO in terms of the weight ratio of CaO to the impurity SiO_2 content in the SiC powder particles.
The SiC molded lump according to claim 3, wherein _2 is added in a range of 0.7 to 1.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61168860A JPS6326307A (en) | 1986-07-17 | 1986-07-17 | Molded sic lump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61168860A JPS6326307A (en) | 1986-07-17 | 1986-07-17 | Molded sic lump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6326307A true JPS6326307A (en) | 1988-02-03 |
Family
ID=15875901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61168860A Pending JPS6326307A (en) | 1986-07-17 | 1986-07-17 | Molded sic lump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6326307A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS571563A (en) * | 1980-06-03 | 1982-01-06 | Shin Kobe Electric Mach Co Ltd | Production of grid body for pole plate of storage battery |
-
1986
- 1986-07-17 JP JP61168860A patent/JPS6326307A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS571563A (en) * | 1980-06-03 | 1982-01-06 | Shin Kobe Electric Mach Co Ltd | Production of grid body for pole plate of storage battery |
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