JPH0446057A - Magnesia-chrominum-based synthetic raw material - Google Patents
Magnesia-chrominum-based synthetic raw materialInfo
- Publication number
- JPH0446057A JPH0446057A JP2152700A JP15270090A JPH0446057A JP H0446057 A JPH0446057 A JP H0446057A JP 2152700 A JP2152700 A JP 2152700A JP 15270090 A JP15270090 A JP 15270090A JP H0446057 A JPH0446057 A JP H0446057A
- Authority
- JP
- Japan
- Prior art keywords
- magnesia
- raw material
- chromium
- mgo
- based synthetic
- 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.)
- Granted
Links
- 239000002994 raw material Substances 0.000 title abstract description 43
- 230000004907 flux Effects 0.000 claims abstract description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract description 62
- 239000011651 chromium Substances 0.000 abstract description 35
- 235000012245 magnesium oxide Nutrition 0.000 abstract description 31
- 239000000395 magnesium oxide Substances 0.000 abstract description 31
- 229910052804 chromium Inorganic materials 0.000 abstract description 29
- 239000000203 mixture Substances 0.000 abstract description 24
- 239000002893 slag Substances 0.000 abstract description 21
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 14
- 230000007797 corrosion Effects 0.000 abstract description 12
- 238000005260 corrosion Methods 0.000 abstract description 12
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 abstract description 11
- 229910000423 chromium oxide Inorganic materials 0.000 abstract description 11
- 239000011819 refractory material Substances 0.000 abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 6
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 229910052681 coesite Inorganic materials 0.000 abstract description 3
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 3
- 239000000377 silicon dioxide Substances 0.000 abstract description 3
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 229910052682 stishovite Inorganic materials 0.000 abstract description 3
- 229910052905 tridymite Inorganic materials 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract 2
- 229910052593 corundum Inorganic materials 0.000 abstract 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- 229910019830 Cr2 O3 Inorganic materials 0.000 abstract 1
- 229910052596 spinel Inorganic materials 0.000 description 14
- 239000011029 spinel Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 240000004322 Lens culinaris Species 0.000 description 1
- 235000014647 Lens culinaris subsp culinaris Nutrition 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明はマグネシア・クロム質耐火物の耐食性及びスラ
グ浸潤を改良−するためのマグネシア・クロム系合成原
料に関し、更に詳しくは一定重量比のマグネシア原料と
クロム鉱か、酸化クロムまたはそれら両者を混合し、成
形後焼成するか、電融して製造されるマグネシア・クロ
ム系合成原料に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnesia-chromium synthetic raw material for improving the corrosion resistance and slag infiltration of magnesia-chromium refractories. This invention relates to a magnesia-chromium synthetic raw material produced by mixing raw materials with chromium ore, chromium oxide, or both, and then firing or melting the mixture after molding.
［従来の技術］
製鋼炉、特に二次精錬炉などの特殊精錬炉に使用される
耐火物は高温下で、且つＣａｏ ／ Ｓ ｉ Ｏ２の低
い低塩基度スラグや溶鋼摩耗など苛酷な使用条件下で使
用され、著しい損耗を受ける０通常、これらの使用部位
には、マグネシア・クロム質耐火物が使用されているが
、より耐食性の向上を図るために種々の改良がなされて
いる。耐食性の向上を図るために、フラックス成分の少
ないマグネシア原料やクロム鉱を使用すること、あるい
はＣｒｚＯｓを付加した原料を使用し、ｔＭ及び焼結す
ることにより緻密で均一な組織のマグネシア・クロム系
原料を使用することで対応してきた。[Prior Art] Refractories used in steelmaking furnaces, especially special refining furnaces such as secondary refining furnaces, are used under severe usage conditions such as high temperatures and low basicity slag with low Cao/SiO2 and molten steel wear. Normally, magnesia-chromium refractories are used in these parts, but various improvements have been made to improve their corrosion resistance. In order to improve corrosion resistance, magnesia raw materials and chromite with low flux components are used, or raw materials with added CrzOs are used, and magnesia/chromium-based raw materials with a dense and uniform structure are created by tM and sintering. I have dealt with this by using .
その例が特開昭５９−５４６７０号公報及び特開昭６４
−４２３６２号公報で既に発表されている。特開昭５９
−５４６７０号公報は重量割合でＭｇＯ１３〜６２％、
ＣｒｚＯｓ３６〜８４％且つ両者の合量が８５％以上の
化学組成のピクロクロマイトを使用して耐食性の向上を
図ったものであり、特開昭６４−４２３６２号公報はＣ
ｒｚｏ ｓ／ ＭｇＯの重量比が０．１５〜０．４５で
、ＣｒｚＯ３／合計フラックス成分の重量比が１．８〜
３．１の電融マグネシア・クロム原料を使用し、耐食性
の向上を図ったものである。Examples are JP-A-59-54670 and JP-A-64.
It has already been announced in Publication No. -42362. Japanese Unexamined Patent Publication 1983
-54670 publication has MgO of 13 to 62% by weight,
The corrosion resistance is improved by using picrochromite with a chemical composition of 36 to 84% CrzOs and a total content of 85% or more, and JP-A-64-42362 discloses C
The weight ratio of rzos/MgO is 0.15 to 0.45, and the weight ratio of CrzO3/total flux component is 1.8 to 0.45.
3.1 electrofused magnesia/chromium raw material is used to improve corrosion resistance.
［発明が解決しようとする課題］
本発明は特にＣａＯ／５ｉＯｚの低い低塩基度スラグに
対して優れた耐食性を有するマグネシア・クロム系合成
原料を提供することによって、より使用条件の苛酷な分
野に使用の拡大を区ると共に耐火物使用原単位の低下を
意図するものである。[Problems to be Solved by the Invention] The present invention provides a magnesia-chromium-based synthetic raw material that has excellent corrosion resistance, especially against low basicity slag with low CaO/5iOz, and is suitable for use in fields with more severe usage conditions. The aim is to expand the use of refractories and reduce the unit consumption of refractories.
［課題を解決するための手段］
本発明はマグネシア・クロム系原料の耐スラグ性に影響
を及ぼす特性が電融あるいは焼結により得られたマグネ
シア・クロム系原料中に生成する二次スピネルの組成を
制御することにより耐食性が大幅に改善されるという知
見に基づいて完成したものである。[Means for Solving the Problems] The present invention aims at improving the composition of secondary spinel produced in magnesia-chromium-based raw materials obtained by electrofusion or sintering, which has characteristics that affect the slag resistance of magnesia-chromium-based raw materials. This was completed based on the knowledge that corrosion resistance can be significantly improved by controlling
即ち、本発明はＭｇＯ５５〜７０重量％、Ｃｒ２０３２
５〜３５重量％の化学組成であり、Ｍ ｇＯ／ Ｃｒ
２０ ｓの重量比が１．６〜２．８の範囲内にあり、且
つＳｉｎ、、Ａｌ２Ｏ５、Ｆｅ２０ｓ、ＣａＯの合計フ
ラックス成分量が１０重量％以下であることを特徴とす
るマグネシア・クロム系合成原石に係る。That is, the present invention uses 55 to 70% by weight of MgO, Cr2032
The chemical composition is 5-35% by weight, MgO/Cr
Magnesia-chromium based synthesis characterized in that the weight ratio of 20s is within the range of 1.6 to 2.8, and the total flux component amount of Sin, Al2O5, Fe20s, and CaO is 10% by weight or less. Concerning rough stones.
［作 用］
本発明のマグネシア・クロム系合成原料は原料中の合計
フラックス成分を単に低下させたり、あるいはＣＩ”２
０３値を高めてマグネシア・クロム系原料の緻密化や組
織の均一化を図ることよりも、原料中のペリクレース結
晶や結晶粒界に生成する二次スピネルの組成をより耐食
性に優れた組成にしようとするものである。そのために
はマグネシア・クロム系合成原料の化学組成をＭｇＯ５
５〜７０重量％、Ｃｒ２０３２５〜３５重量％、合計フ
ラックス成分量を１０重量％以下にするとよい。[Function] The magnesia-chromium based synthetic raw material of the present invention simply reduces the total flux component in the raw material, or
Rather than increasing the 03 value to make the magnesia/chromium-based raw material more dense and homogeneous, it is better to make the composition of the secondary spinel that forms at the periclase crystals and grain boundaries in the raw material more corrosion resistant. That is. For this purpose, the chemical composition of magnesia/chromium-based synthetic raw materials must be changed to MgO5.
5 to 70% by weight, Cr20, 325 to 35% by weight, and the total amount of flux components is preferably 10% by weight or less.
従来、マグネシア原料中の８１０２、ＣａＯは少ない方
が良いとされてきた。その理由は５ｉＯｚ、ＣａＯ成分
は低融点の珪酸塩質相を原料中に生成して原料の品質を
低下すると共にクロム鉱中の三・二酸化物を珪酸塩質相
に溶解する。その溶解度はＦｅｚＯｘ＞ＡｂＯ３＞Ｃｒ
ｚＯｓの順にあり、Ｃｒ２Ｏ５は最も溶解しにくい、ま
た、スピネルの融点及び分解点はＭｇＣｒ２０゜が２１
８０℃、Ｍｇ、１２０．が２１３５℃、ＭｇＦｅ２０ｚ
が１７７０℃である。Conventionally, it has been thought that it is better to have less 8102 and CaO in the magnesia raw material. The reason for this is that the 5 iOz CaO component produces a silicate phase with a low melting point in the raw material, lowering the quality of the raw material, and also dissolves tri-dioxide in the chromite into the silicate phase. Its solubility is FezOx>AbO3>Cr
zOs, and Cr2O5 is the least soluble, and the melting point and decomposition point of spinel are MgCr20° and 21
80°C, Mg, 120. is 2135℃, MgFe20z
is 1770°C.
ＳｉＣ２やＣａＯが多い原料中には低融点組成のスゆ
とネルが生成し易く、このなめも５ｉＯｚやＣａＯ成分
は少ない方が良い、しかしながら、クローム鉱は天然品
であり、ＭｇＯ１Ｃｒ２０ｉ、Ｆｅ酸化物、Ａｌ２Ｏ，
の他にＳｉｎ、やＣａＯを伴った複雑な組成で産出する
。従って、低塩基度スラグに対してはＣｒ２Ｏ５成分が
耐食性に優れているが、低フラックスでＣｒｚＯｓ値の
高い原料を製造するにはクロム鉱の使用量が限られ、酸
化クロムを使用せざるを得ない、しかし、このようなＣ
ｒｚＯ＊値の高いマグネシア・クロム系合成原料は高価
であり、且つれんかに使用した場涜に焼結しにくい欠点
がある。酸化クロムを使用しないか、少量使用してマグ
ネシア・クロム系原料中に低塩基度スラグに対して優れ
た耐スラグ性のＭｇＣｒｚＯ＜組成のスピネルを多く生
成させた原料が望ましい。Syutonel with a low melting point composition is likely to be formed in raw materials containing a lot of SiC2 and CaO, and it is better to have less 5iOz and CaO components.However, chromite is a natural product, and MgO1Cr20i, Fe oxide , Al2O,
It is produced with a complex composition that also includes Sin and CaO. Therefore, the Cr2O5 component has excellent corrosion resistance against low basicity slag, but in order to produce raw materials with low flux and high CrzOs value, the amount of chromite used is limited, and chromium oxide must be used. No, but C like this
Magnesia-chromium based synthetic raw materials with high rzO* values are expensive and have the disadvantage that they are difficult to sinter when used in lentils. It is desirable to use a raw material that does not use chromium oxide or uses a small amount of chromium oxide to produce a large amount of spinel with a composition of MgCrzO<, which has excellent slag resistance against low basicity slag, in the magnesia-chromium-based raw material.
各種電融マグネシア・クロム鉱中のペリクレース結晶粒
界に生成した二次スピネルを分析した結果、合計フラッ
クス成分量の多いものやＣｒ２０３値の低い電融マグネ
シア・クロム系原料中のスピネルはＭ ｇＣｒ２０ 、
組成のスピネルは少なく、Ｍ ｇ（Ａ １． Ｆ ｅ）
２０．系スピネルが多い。一方、酸化クロムを多量に添
加して製造したマグネシア・クロム系原料つにいてもＭ
ｇｃ ｒ、○１組成のスピネルは増加せず、酸化クロ
ムを添加した効果は少ない。As a result of analyzing the secondary spinel formed at the periclase grain boundaries in various types of fused magnesia/chromite, spinel in fused magnesia/chromium-based raw materials with a high total flux content or a low Cr203 value has M gCr20 ,
There is less spinel in the composition, M g (A 1. Fe)
20. There are many types of spinel. On the other hand, even when magnesia/chromium-based raw materials manufactured by adding a large amount of chromium oxide
The spinel with gcr, ○1 composition did not increase, and the effect of adding chromium oxide was small.
従って、低塩基度スラグに対する耐スラグ性に効果があ
るＭｇＣｒｚＣＬ組成のスピネルを多く生成させるため
の適正な化学組成はＭｇＯ５５〜７０重量％、Ｃｒ２０
３２５〜３０重量％、ＭｇＯ／Ｃｒ２Ｏ３重量比が１．
６〜２．８、ＭｇＯ、Ｃｒ２０）＋以外の合計フラック
ス成分量１０重量％以下に限定される。Therefore, the appropriate chemical composition for producing a large amount of spinel with the MgCrzCL composition, which is effective in slag resistance against low basicity slag, is 55 to 70% by weight of MgO and Cr20.
325-30% by weight, MgO/Cr2O3 weight ratio is 1.
The total amount of flux components other than 6 to 2.8, MgO, and Cr20)+ is limited to 10% by weight or less.
本発明のマグネシア・クロム系合成原料の製造方法は一
定量比のマグネシア原料とクロム鉱及び酸化クロムの１
種か、２種を混合後炉例えば電気炉中で十分溶融し、自
然冷却することにより製造することができる。なお、原
料中の２次スピネルの組成を制御することができれば焼
結方法を特に限定するものではない。The method for producing a magnesia/chromium-based synthetic raw material of the present invention includes a magnesia raw material, chromium ore, and chromium oxide in a certain ratio.
It can be produced by mixing one or two species, sufficiently melting the mixture in a furnace, for example, an electric furnace, and cooling naturally. Note that the sintering method is not particularly limited as long as the composition of the secondary spinel in the raw material can be controlled.
［実 施 例コ
実施例
第１表に示す組成のマグネシア原料、クロム鉱及び酸化
クロム原料を所定重量比で混合し、電気炉で完全に原料
を電融することによりマグネシアクロム系合成原料を製
造した。[Example Example] Magnesia raw materials, chromium ore, and chromium oxide raw materials having the composition shown in Table 1 are mixed in a predetermined weight ratio, and the raw materials are completely electromelted in an electric furnace to produce a magnesia chromium-based synthetic raw material. did.
得られたマグネシア・クロム系合成原料の化学組成、粒
物性及び低塩基度スラグに対する耐スラグ性の評価を第
２表に示す、なお、鉱物組成はいずれもペリクレースと
Ｃｒ−スピネルであることをＸ線回折により確認した。The chemical composition, grain properties, and evaluation of slag resistance against low basicity slag of the obtained magnesia-chromium-based synthetic raw material are shown in Table 2. Confirmed by line diffraction.
耐スラグテスト用ブリゲットの作製；
上述のようにして得られたマグネシア・クロム系合成原
料を粉砕、粒調した後粒度３〜１ｍｍ４０％、 １〜０
．３−輪２０ ％、 −〇 、３−一４０％にバインダ
ー（サンサルＸ＞４％（外掛）を加えて混合した。Preparation of brigette for slag resistance test; After crushing and granulating the magnesia-chromium synthetic raw material obtained as described above, the particle size was 3 to 1 mm, 40%, 1 to 0.
．． A binder (Sansal
得られた混合物を加圧成形（成形圧力５００ ｋｇ／ａ
ｍ２）して８０Ｘ６０Ｘ４Ｃ）＋ｍの寸法のブリゲット
を得た。成形後のブリケットを１００〜１１０℃の温度
で恒量になるまで乾燥した後スラグテストに供した。The obtained mixture was pressure molded (molding pressure 500 kg/a
m2) to obtain a brigette with dimensions of 80x60x4C)+m. The molded briquettes were dried at a temperature of 100 to 110° C. until a constant weight was obtained, and then subjected to a slag test.
耐久ラグテスト条件：
回転侵食テスト法
１５００℃×１時闇を１サイクルとして４サイクル １
サイクルのスラグ使用量２００ｓスラグの組成Ｃａｏ
／ Ｓ ｉｏ ２＝約１侵食テストの評価方法
テスト後試料を回転炉から取り出し、それぞれの試料に
ついて溶損量を測定した。評価は比較例Ａを１００とし
た時の溶損指数で示した。Durability lag test conditions: Rotary erosion test method 1500℃ x 1 hour darkness for 4 cycles 1
Cycle slag consumption 200s Slag composition Cao
/S io 2=approximately 1 Evaluation method of erosion test After the test, the samples were taken out of the rotary furnace, and the amount of erosion was measured for each sample. The evaluation was shown by the erosion index when Comparative Example A was set as 100.
比較例Ａは市販の代表的なマグネシア・クロム系合成原
料であり、これと比較して耐スラグ性を評価した。Comparative Example A is a typical commercially available magnesia-chromium synthetic raw material, and the slag resistance was evaluated in comparison with this.
本発明のＤ〜ＧはＣｒ２０−２５〜３５重量％、ＭｇＯ
５５〜７０重量％、合計フラックス成分は１０重量？Ｊ
以下にあり、Ｍ ｇ Ｏ／ Ｃｒ ２０３重量−比は１
６〜２，８の範囲内にある１ｗ、料中に生成した二次ス
ピネルの組成（第３表）は試料間に殆ど差がなく、Ｃｒ
＋○ユが約７０％のもので、Ｍ ［Ｉ Ｃｒ ２０４の
理論組成に近い、一方、耐スラグ性については比較例Ａ
、Ｂよりも極めて優れていた。D to G of the present invention are 20-25 to 35% by weight of Cr, MgO
55-70% by weight, total flux component is 10% by weight? J
and the M g O/Cr 203 weight-ratio is 1
The composition of the secondary spinel produced in the 1W material (Table 3), which is within the range of Cr.
It has about 70% +○Y, which is close to the theoretical composition of M [I Cr 204, while the slag resistance is similar to that of Comparative Example A
, was extremely superior to B.
比較例ＢはＣｒ２０＝が２５％以下と少なく、スピネル
の組成もＣｒ２０ｚが少ない、耐食性についても劣るが
、この原因はＣｒ２０−分が不足しているためと考えら
れる、
一方、酸化クロムを本発明品より多く使用し、製造した
比較例Ｃはスピネル中のＣｒ２Ｏ＊が少ない、この点は
測定位置の違いやバラツキが考えられる。しかし、耐ス
ラグ性についても本発明品Ｅ〜Ｇよりも劣る。従って、
高価な酸化クロムを使用したわりにはその改善効果が少
ない。Comparative example B has a low Cr20 = 25% or less, the spinel composition has a low Cr20z, and its corrosion resistance is poor, but this is thought to be due to the lack of Cr20-.On the other hand, the chromium oxide of the present invention Comparative Example C, which was manufactured using a larger amount than the product, had less Cr2O* in the spinel, which may be due to differences in measurement positions and variations. However, the slag resistance is also inferior to the products E to G of the present invention. Therefore,
Although expensive chromium oxide is used, the improvement effect is small.
第
表
（重量％）
［発明の効果］
本発明のマグネシア・クロム系合成原料は低塩基度スラ
グに対して耐スラグ性に極めて優れたものである。従っ
て、定形、不定形耐火物とすることによって高耐食性が
要求される製鉄、製鋼用耐火物や新製調法用耐火物に適
用可能な原料である。Table 1 (wt%) [Effects of the Invention] The magnesia-chromium synthetic raw material of the present invention has extremely excellent slag resistance against low basicity slag. Therefore, it is a raw material that can be applied to refractories for iron and steel manufacturing, and refractories for new manufacturing methods, which require high corrosion resistance by forming shaped or unshaped refractories.
Claims (1)
重量％の化学組成をもち、ＭｇＯ／Ｃｒ＿２Ｏ＿３の重
量比が１．６〜２．８の範囲内にあり、且つＳｉＯ＿２
、Ａｌ＿２Ｏ＿３、Ｆｅ＿２Ｏ＿３、ＣａＯの合計フラ
ックス成分量が１０重量％以下であることを特徴とする
マグネシア・クロム系合成原料。MgO55-70% by weight, Cr_2O_325-35
% by weight, the weight ratio of MgO/Cr_2O_3 is within the range of 1.6 to 2.8, and SiO_2
, Al_2O_3, Fe_2O_3, and CaO in a total flux component amount of 10% by weight or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2152700A JPH075355B2 (en) | 1990-06-13 | 1990-06-13 | Magnesia / Chromium synthetic raw material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2152700A JPH075355B2 (en) | 1990-06-13 | 1990-06-13 | Magnesia / Chromium synthetic raw material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0446057A true JPH0446057A (en) | 1992-02-17 |
| JPH075355B2 JPH075355B2 (en) | 1995-01-25 |
Family
ID=15546237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2152700A Expired - Lifetime JPH075355B2 (en) | 1990-06-13 | 1990-06-13 | Magnesia / Chromium synthetic raw material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH075355B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6237787B1 (en) * | 1996-06-13 | 2001-05-29 | Johnson & Johnson Consumer Products, Inc. | Packaging system for storing and dispensing products |
-
1990
- 1990-06-13 JP JP2152700A patent/JPH075355B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6237787B1 (en) * | 1996-06-13 | 2001-05-29 | Johnson & Johnson Consumer Products, Inc. | Packaging system for storing and dispensing products |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH075355B2 (en) | 1995-01-25 |
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