JPH04209745A - Method for extracting refractory composition from graphite-containing refractory - Google Patents
Method for extracting refractory composition from graphite-containing refractoryInfo
- Publication number
- JPH04209745A JPH04209745A JP2400360A JP40036090A JPH04209745A JP H04209745 A JPH04209745 A JP H04209745A JP 2400360 A JP2400360 A JP 2400360A JP 40036090 A JP40036090 A JP 40036090A JP H04209745 A JPH04209745 A JP H04209745A
- Authority
- JP
- Japan
- Prior art keywords
- graphite
- refractory
- container
- composition
- containing refractory
- 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.)
- Withdrawn
Links
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 43
- 239000010439 graphite Substances 0.000 title claims abstract description 43
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000000203 mixture Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000001590 oxidative effect Effects 0.000 claims abstract description 4
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 abstract description 6
- 238000011049 filling Methods 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 20
- 239000011819 refractory material Substances 0.000 description 20
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 239000000395 magnesium oxide Substances 0.000 description 6
- 239000011449 brick Substances 0.000 description 5
- 239000011362 coarse particle Substances 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- -1 A12 There are Ch Chemical compound 0.000 description 1
- 229910000497 Amalgam Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
［０００１１ [00011
【産業上の利用分野］本発明は、低品位黒鉛含有耐火物
あるいは使用後回収された黒鉛含有耐火物から、黒鉛を
含む燃焼成分の灰分と耐火組成物を耐火物で内張リライ
ニングされた円筒型または回転容器を用いて分別抽出す
る方法に関するものである。
［０００２］
【従来の技術】現在、おもに鉄鋼業では、黒鉛の耐熱性
、溶融スラブとの濡れにくさ及び熱伝導性の特性から転
炉ではマグネシア−黒鉛質煉瓦、連鋳関係ではアルミナ
−黒鉛質煉瓦及び混銑車ではアルミナ−炭化珪素−黒鉛
質などの黒鉛含有耐火物が昭和５０年前半から急速に使
用され始め、現在では全耐火物使用量の約１５〜２０％
近く占めるに至って来た。ところが、これら耐火物の有
効使用率としては、約４０〜６０％と比較的低く必ずし
も資源の効果的な使用がなされていない。
［０００３］一方、使用後回収耐火物の活用方法として
は、特公昭５８−１１７８１６号公報に記載されている
如く出鋼後転炉内に残留させたスラグ中に投入し、炉体
煉瓦の補修に使用する方法、更には特開昭５３−４５６
１６号公報に記載されている如く転炉造滓材の代替とし
て使用されているのが現状である。また、最近では、キ
ャスタブル中に粗骨材として添加する方法も行われつつ
ある。
［０００４］[Industrial Application Field] The present invention is a low-grade graphite-containing refractory or a graphite-containing refractory recovered after use, which is relined with ash of a combustion component containing graphite and a refractory composition. This invention relates to a method of fractional extraction using a cylindrical or rotating container. [0002] [Prior Art] Currently, mainly in the steel industry, magnesia-graphite bricks are used for converters, and alumina-graphite is used for continuous casting, due to graphite's heat resistance, resistance to wetting with molten slabs, and thermal conductivity properties. Graphite-containing refractories such as alumina-silicon carbide-graphite began to be used rapidly in the first half of 1975 for solid bricks and mixed pig iron cars, and currently account for approximately 15 to 20% of the total amount of refractories used.
It has come to occupy a place in the near future. However, the effective usage rate of these refractories is relatively low at about 40 to 60%, and resources are not necessarily used effectively. [0003] On the other hand, as a method of utilizing recovered refractories after use, as described in Japanese Patent Publication No. 58-117816, it is put into the slag left in the converter after steel tapping, and used for repairing furnace bricks. The method used in JP-A-53-456
Currently, it is used as a substitute for converter slag material as described in Publication No. 16. Also, recently, a method of adding coarse aggregate to castable is also being used. [0004]
【発明の解決しようとする課題】しかしながら、黒鉛含
有耐火物を精錬スラグに添加してコーティングしても本
来の耐火物に相当する耐食性は望めず耐火物の有効活用
化までは至っていない。また、耐火物中のＭｇＯやＣａ
Ｏ等の活用のために転炉造滓材として用いる場合も耐火
物といった高価な素材を転活し得ていない実状にある。
［０００５１本発明は、上記問題点を解決するため多量
に発生する使用済みの黒鉛含有耐火物あるいは低品位耐
火物から高級耐火組成物を耐火物製造時の粒度を低下す
ることなく分別抽出し、高級耐火組成物の再利用を容易
にしかも安価で行なう方法を提供するものである。
［０００６］However, even if graphite-containing refractories are added to refined slag and coated, corrosion resistance equivalent to that of the original refractories cannot be expected, and the refractories have not yet been effectively utilized. In addition, MgO and Ca in refractories
Even when used as a converter-building slag material for the utilization of oxygen, etc., the reality is that expensive materials such as refractories cannot be converted. [00051] In order to solve the above problems, the present invention separates and extracts a high-grade refractory composition from used graphite-containing refractories or low-grade refractories that are generated in large quantities without reducing the particle size during refractory production, An object of the present invention is to provide a method for easily and inexpensively reusing high-grade refractory compositions. [0006]
【課題を解決するための手段】本発明は、黒鉛含有耐火
物を円筒型あるいは円錘筒型回転容器に該容器の内容積
率を７０％以下に充填し、且つ該容器を内径の臨界回転
速度の５〜５０％で回転駆動させるとともに、容器内を
高温酸化雰囲気にして黒鉛含有耐火物中の黒鉛あるいは
含有燃焼成分を灰化して、該黒鉛含有耐火物から遊離し
た耐火組成物を該容器内に１個または複数個の大粒と細
粒とを分別する分離板を設け、該分離板を通して黒鉛含
有耐火物が転動する領域から長手方向に分離して、粒度
を低下させることなく抽出を行なう方法である。
［０００７］本発明の黒鉛含有耐火物は、マグネシア−
黒鉛質、アルミナ−黒鉛質、アルミナ−炭化珪素−黒鉛
質、ジルコニア−黒鉛質などの高品位耐火物あるいは一
般の黒鉛含有耐火物の使用後の回収耐火物を含むもので
特に使用後の耐火物の再生の効果が大きい。
［０００８］これ等の処理について図面を示して説明す
る。図１は装置の概略図を示し、 （イ）は回転型容器
の断面図を示し、 （ロ）は（イ）図の回転型容器のＡ
Ａ°断面図である。３は円筒型回転容器で、１はバーナ
、６は容器の内張り耐火物、２は回転駆動装置、７は開
口部である。
［０００９１図１の装置の概略図に示すように、黒鉛含
有耐火物の使用後の回収物を耐火物６で内張リライニン
グされた円筒型（または円錐筒型図示せず）の回転容器
３に該内容積の７０％以下の装填率で供給し、該容器を
水平もしくは傾斜させ内径りの臨界回転速度Ｎｃ （
＝４２、 ３／７Ｄ）の５〜５０％で回転駆動させ、該
容器の一端よりバーナー１にて容器内を高温酸化雰囲気
にせしめ、使用後回収物中の黒鉛または燃焼成分を灰化
せしめるとともに使用後の黒鉛含有耐火物の回収物の回
転容器内での断面方向の偏析−転動効果により灰分と耐
火組成物を連続的に分別抽出せしめ、系外に回収する方
法である。
［００１０１この回転容器内への使用後の回収物の装填
率としては、容器内で回収物の転勤流動が得られる７０
％以下の範囲が好ましい。７０％を越える装填率では、
容器内での回収物の挙動が単純な円運動のみが主体とな
り、内壁に沿った円運動から離れた直後からの放物線的
な落下現象が充分に得られないために酸化した表面灰化
層を粉砕分離する効果が得られない。
［００１１１また、回転速度としては内径りの臨界回転
速度Ｎｃ （＝４２． ３／、／’−Ｄ）の５〜５０
％が好ましい。
［００１２］また、本発明において円筒型（円錐筒型図
示せず）の容器３の回転速度を５〜５０％に調節するこ
とにより、容器内の回収物は内壁に沿った円運動と自由
表面での流下運動の双方から構成されるカスケード流動
を呈する。この際、未酸化の塊状粗大粒は、容器断面の
外周側に粒度偏析し、内壁に沿った円運動から外れると
きに放物線の軌跡で落下するため酸化した表面灰化層を
粉砕分離出来、しかも粉粒状に混合剥離した灰分と耐火
組成物は相対的に容器断面の内周部に粒度偏析する。
［００１３］この際に混合剥離した耐火組成物が容器断
面の円周部に粒度偏析するまでに未酸化の塊状粗大粒の
落下により粉砕され抽出粒度が低下するため、塊状粗大
粒から剥離した耐火組成物を迅速に分離する必要がある
。このために、該容器内に分離板として例えば歯車状の
円板４を設けることにより剥離した耐火組成物を円板４
の開孔部４ａを通して容器長手方向に迅速に分離するこ
とにより、塊状粗大粒の落下時に粉砕されず粒度を低下
させることなく抽出が可能となる。この歯車状の円板４
は抽出炉に直接仕切り板を設は内外周部に複数の空孔を
穿設したもので良く、いわゆる下流側へ流下する細粒を
大塊粒から分別するものであれば良く金網あるいはロス
ドル等を用いる。この分離板は、原料用耐火物の粒径よ
りも小さい孔又は切欠を有するものであり、好ましくは
４０ｍｍφより小さいことが好ましい。又この分離板は
１個又は複数個設置するが、複数個の場合、孔又は切欠
は同一径のもの、又は出口に近づくもの程小さくしたも
のを設置する。
［００１４］一方、回転速度をＮｃの５％以下では塊状
粗大粒の酸化した表面灰化層の粉砕効果が低下し、Ｎｃ
の５０％以上では、自由表面での滑らかな流下現象が得
られないため粉粒状に混合剥離した灰分と耐火組成物の
粒度及び密度偏析効果が充分に得られない。ここで、容
器内の温度としては、黒鉛の酸化促進及び灰分の溶融合
体の造粒効果を考慮して５００℃以上が好ましい。
［００１５］又、分離効率を向上する目的で、円筒型容
器の内径を連続的に変化させた円錐型容器を用いれば、
断面方向だけでなく、容器の長さ方向での粒度偏析効果
が得られ、大口径側から比較的粒度の小さい粒子を、小
口径側から比較的粒度の大きい粒子を分別回収すること
が可能である。
［００１６１更に、内張リライニング材質については、
回収された黒鉛含有耐火物と同種で黒鉛が含有していな
い耐火物もしくは回収再利用しようとする耐火組成物と
処理温度で反応しにくい成分の耐火物が好ましい。これ
等の操作によって抽出される組成物は、ＭｇＯ，Ａ１２
Ｃｈ、ＺｒＯ２等があり、これ等以外には別ルートから
前記組成物を含んだ灰分（Ｆ ｅ２０３． Ｓ ｉｏ２
．その他）が排出される。
［００１７］[Means for Solving the Problems] The present invention is directed to filling a cylindrical or conical rotating container with a graphite-containing refractory to an inner volume ratio of 70% or less, and rotating the container at a critical rotation of the inner diameter. While rotating at 5 to 50% of the speed, the inside of the container is made into a high-temperature oxidizing atmosphere to ash the graphite or the combustion components contained in the graphite-containing refractory, and the refractory composition liberated from the graphite-containing refractory is transferred to the container. A separator plate for separating one or more large particles and fine particles is provided in the interior, and through the separator plate, the graphite-containing refractory is separated in the longitudinal direction from the area where it rolls, and extraction is performed without reducing the particle size. This is the way to do it. [0007] The graphite-containing refractory of the present invention includes magnesia
High-grade refractories such as graphite, alumina-graphite, alumina-silicon carbide-graphite, zirconia-graphite, etc., or general graphite-containing refractories, including recovered refractories after use, especially used refractories. The regeneration effect is great. [0008] These processes will be explained with reference to the drawings. Figure 1 shows a schematic diagram of the device, (a) shows a cross-sectional view of the rotary container, and (b) shows A of the rotary container in figure (a).
It is an A degree cross-sectional view. 3 is a cylindrical rotating container, 1 is a burner, 6 is a refractory lining of the container, 2 is a rotational drive device, and 7 is an opening. [00091 As shown in the schematic diagram of the apparatus in FIG. 1, a cylindrical (or conical cylinder type not shown) rotating container 3 lined with a refractory 6 and relined with a refractory material 6 is used to collect the recovered material after using the graphite-containing refractory. is supplied at a loading rate of 70% or less of the internal volume, and the critical rotational speed Nc (
= 42, 3/7D) at 5 to 50%, and burner 1 is used from one end of the container to create a high-temperature oxidizing atmosphere inside the container to incinerate graphite or combustion components in the recovered material after use. This is a method in which the ash and refractory composition are continuously separated and extracted by segregation and rolling effects in the cross-sectional direction within a rotating container of recovered graphite-containing refractories after use, and recovered outside the system. [00101 The loading rate of the recovered materials after use into this rotating container is 70 to obtain a transfer flow of the recovered materials within the container.
% or less is preferable. At loading rates over 70%,
The behavior of the recovered material inside the container is mainly based on simple circular motion, and the parabolic falling phenomenon immediately after leaving the circular motion along the inner wall cannot be sufficiently obtained, so the oxidized surface ash layer is removed. The effect of crushing and separating cannot be obtained. [00111 Also, the rotational speed is 5 to 50 of the inner critical rotational speed Nc (=42.3/, /'-D)
% is preferred. [0012] Furthermore, in the present invention, by adjusting the rotational speed of the cylindrical (conical cylinder type not shown) container 3 to 5 to 50%, the recovered material in the container can move in a circular motion along the inner wall and on the free surface. It exhibits a cascade flow consisting of both downward motion at and. At this time, the unoxidized lumpy coarse particles are segregated in particle size on the outer circumferential side of the cross section of the container, and when they deviate from the circular motion along the inner wall, they fall in a parabolic trajectory, making it possible to crush and separate the oxidized surface ash layer. The ash and the refractory composition mixed and exfoliated into powder particles are relatively segregated in particle size at the inner circumference of the cross section of the container. [0013] At this time, before the mixed and exfoliated refractory composition is segregated in particle size at the circumferential portion of the cross section of the container, the unoxidized massive coarse particles are crushed by falling and the extracted particle size is reduced, so that the refractory composition exfoliated from the agglomerated coarse particles There is a need to separate the composition quickly. For this purpose, a gear-shaped disc 4, for example, is provided as a separating plate in the container, and the peeled fireproof composition is removed from the disc 4.
By quickly separating the bulk particles in the longitudinal direction of the container through the openings 4a, extraction is possible without reducing the particle size of the bulky coarse particles, which are not crushed when they fall. This gear-shaped disk 4
Instead of installing a partition plate directly in the extraction furnace, a partition plate with multiple holes drilled in the inner and outer peripheries may be used.If it separates the fine particles flowing downstream from the large particles, a wire mesh or Rosdol plate may be used. Use. This separation plate has holes or notches smaller than the particle size of the raw material refractory, preferably smaller than 40 mmφ. One or more separator plates may be installed; in the case of multiple separators, the holes or notches should be of the same diameter, or those closer to the outlet should have smaller diameters. [0014] On the other hand, when the rotation speed is 5% or less of Nc, the pulverizing effect of the oxidized surface ash layer of massive coarse particles decreases, and the Nc
If it is 50% or more, a smooth flowing phenomenon on the free surface cannot be obtained, so that the particle size and density segregation effect of the exfoliated ash and refractory composition mixed in powder and granules cannot be sufficiently obtained. Here, the temperature inside the container is preferably 500° C. or higher, taking into account the acceleration of oxidation of graphite and the granulation effect of the molten amalgam of ash. [0015] Furthermore, for the purpose of improving separation efficiency, if a conical container in which the inner diameter of the cylindrical container is continuously changed is used,
Particle size segregation effects can be obtained not only in the cross-sectional direction but also in the longitudinal direction of the container, making it possible to separate and collect relatively small particles from the large diameter side and relatively large particles from the small diameter side. be. [00161 Furthermore, regarding the inner relining material,
It is preferable to use a refractory that is the same type as the recovered graphite-containing refractory but does not contain graphite, or a refractory whose components do not easily react with the refractory composition to be recovered and reused at the processing temperature. The composition extracted by these operations is MgO, A12
There are Ch, ZrO2, etc., and in addition to these, ash (F e203. S io2
．． etc.) are discharged. [0017]
【実施例】図１に示すようなマグネシア質で内張リライ
ニングされた内径２５０ｍｍ長さ１２００ｍｍで傾斜角
度３°に設置された回転円筒型容器内に円板の外周部に
２０ｍφの半円状の開孔部を有した歯車状の分離板を長
手方向で反バーナー設置側３００ｍｍの位置に設置した
。
［００１８］容器内温度を９００℃に昇温保定し、円筒
内酸素濃度を１８〜２０％にコントロールした後、回転
速度を２Ｏｒ、ｐ、ｍで回転させ（内径の臨界回転速度
の約２４％）、７０ｍｍから５０ｍｍに粒度調節した使
用後マグネシア−黒鉛質煉瓦を装填率３０％で投入した
。
［００１９１反バーナー側より抽出されたマグネシアク
リンカ−の粒度を表１に示す。又、歯車状の分離板を設
置しないで行なった結果も表１に示す。同表に示すよう
に分離板がない方法に比較し本発明方法では、煉瓦製造
時の粒度構成に近いマグネシアクリンカ−が抽出出来て
いる。
［００２０１
【表１］
［００２１１
【発明の効果］本発明により、これまで付加価値の高い
有効利用がなされていなかった使用後黒鉛含有耐火物か
ら高級耐火組成物を容易にしかも安価で配合粒度を低下
させることなく分別抽出することが可能となり、有限の
耐火組成物の有効なリサイクルが出来、鉄鋼業用耐火物
の絶対使用量の節減が可能となった。[Example] As shown in Fig. 1, inside a rotating cylindrical container relined with magnesia and having an inner diameter of 250 mm, a length of 1200 mm, and an inclination angle of 3°, a semicircular shape of 20 mφ was placed on the outer periphery of the disc. A gear-shaped separation plate having an opening was installed at a position 300 mm away from the burner installation side in the longitudinal direction. [0018] After raising and holding the temperature inside the container at 900°C and controlling the oxygen concentration inside the cylinder at 18 to 20%, the rotation speed was rotated at 2 Or, p, m (approximately 24% of the critical rotation speed of the inner diameter). ), used magnesia-graphite bricks whose particle size was adjusted from 70 mm to 50 mm were charged at a loading rate of 30%. [00191 Table 1 shows the particle size of magnesia clinker extracted from the anti-burner side. Table 1 also shows the results obtained without installing a gear-shaped separation plate. As shown in the same table, compared to the method without a separator, the method of the present invention allows magnesia clinker to be extracted that has a particle size structure similar to that used in brick manufacturing. [00201] [Table 1] [00211] [Effects of the Invention] The present invention makes it possible to easily produce high-grade refractory compositions from used graphite-containing refractories, which have not been effectively used with high added value, and to reduce the compound particle size at low cost. It has become possible to separate and extract the material without degrading it, making it possible to effectively recycle the limited amount of refractory composition, and reducing the absolute amount of refractories used in the steel industry.
【図１】本発明を実施する装置例の概略図を示し、（イ
）は回転型容器の断面図、 （ロ）は（イ）図の回転型
容器のＡ−Ａ’断面図である。FIG. 1 shows a schematic diagram of an example of an apparatus for carrying out the present invention, in which (a) is a cross-sectional view of a rotary container, and (b) is a cross-sectional view taken along line AA' of the rotary container shown in (a).
１・・・バーナー ２・・・駆動モーター ３・・・回転円筒型容器 ４・・・分離板 ５・・・分離板固定モルタル ６・・・内張り耐火物 1... Burner 2... Drive motor 3...Rotating cylindrical container 4... Separation plate 5...Separator plate fixing mortar 6... Lining refractory material
【図１】[Figure 1]
Claims (1)
回転容器に該容器の内容積率を７０％以下に充填し、且
つ該容器を内径の臨界回転速度の５〜５０％で回転駆動
させるとともに、容器内を高温酸化雰囲気にして黒鉛含
有耐火物中の黒鉛あるいは含有燃焼成分を灰化して、該
黒鉛含有耐火物中の耐火組成物を抽出する方法において
、円筒型あるいは円錘型回転容器内に、１個または複数
個の大粒、細粒分離板を設置し、黒鉛含有耐火物と剥離
した耐火組成物を該容器内の長手方向で分別しつつ耐火
組成物を抽出することを特徴とする黒鉛含有耐火物から
耐火組成物の抽出方法。Claim 1: A cylindrical or cylindrical rotating container is filled with a graphite-containing refractory to an internal volume ratio of 70% or less, and the container is rotated at 5 to 50% of the critical rotational speed of the inner diameter. In the method of extracting the refractory composition in the graphite-containing refractory by driving the container and creating a high-temperature oxidizing atmosphere in the container to incinerate the graphite or the combustion components contained in the graphite-containing refractory, the method uses a cylindrical or conical shape. One or more large-grain and fine-grain separators are installed in a rotating container, and the refractory composition is extracted while separating the graphite-containing refractory and the peeled refractory composition in the longitudinal direction of the container. A method for extracting a refractory composition from a graphite-containing refractory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2400360A JPH04209745A (en) | 1990-12-04 | 1990-12-04 | Method for extracting refractory composition from graphite-containing refractory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2400360A JPH04209745A (en) | 1990-12-04 | 1990-12-04 | Method for extracting refractory composition from graphite-containing refractory |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04209745A true JPH04209745A (en) | 1992-07-31 |
Family
ID=18510278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2400360A Withdrawn JPH04209745A (en) | 1990-12-04 | 1990-12-04 | Method for extracting refractory composition from graphite-containing refractory |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04209745A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012140318A (en) * | 2010-12-17 | 2012-07-26 | Jfe Steel Corp | Method for reusing used carbon-containing refractory |
-
1990
- 1990-12-04 JP JP2400360A patent/JPH04209745A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012140318A (en) * | 2010-12-17 | 2012-07-26 | Jfe Steel Corp | Method for reusing used carbon-containing refractory |
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| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980312 |