JPS6261528B2 - - Google Patents
Info
- Publication number
- JPS6261528B2 JPS6261528B2 JP57179620A JP17962082A JPS6261528B2 JP S6261528 B2 JPS6261528 B2 JP S6261528B2 JP 57179620 A JP57179620 A JP 57179620A JP 17962082 A JP17962082 A JP 17962082A JP S6261528 B2 JPS6261528 B2 JP S6261528B2
- Authority
- JP
- Japan
- Prior art keywords
- graphite
- furnace
- silica
- alumina
- expanded graphite
- 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.)
- Expired
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 37
- 229910002804 graphite Inorganic materials 0.000 claims description 37
- 239000010439 graphite Substances 0.000 claims description 37
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 22
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 13
- 239000000377 silicon dioxide Substances 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000012784 inorganic fiber Substances 0.000 claims description 6
- 239000011247 coating layer Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 239000011229 interlayer Substances 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 10
- 239000002253 acid Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 3
- 238000009830 intercalation Methods 0.000 description 3
- 230000002687 intercalation Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Carbon And Carbon Compounds (AREA)
Description
【発明の詳細な説明】 本発明は膨張黒鉛製造炉に関する。[Detailed description of the invention] The present invention relates to an expanded graphite manufacturing furnace.
一般に膨張黒鉛は、天然黒鉛・キツシユ黒鉛・
熱分解黒鉛など高度に結晶構造の発達した黒鉛を
濃硫酸及び硝酸、濃硫酸及び過マンガン酸カリウ
ム溶液などの強酸化剤の処理液で酸処理して黒鉛
層間化合物を生成させ、水洗したのち酸処理黒鉛
を急速に加熱して黒鉛結晶のＣ軸方向に膨張処理
して得られる。 Generally, expanded graphite is natural graphite, wood graphite,
Graphite with a highly developed crystal structure, such as pyrolytic graphite, is acid-treated with a treatment solution containing a strong oxidizing agent such as concentrated sulfuric acid, nitric acid, concentrated sulfuric acid, and potassium permanganate solution to generate a graphite intercalation compound, and after washing with water, acid treatment is performed. It is obtained by rapidly heating treated graphite to expand it in the C-axis direction of graphite crystals.
従来、膨張黒鉛製造用の加熱炉はガスバーナー
による直接加熱炉が用いられているが、この直接
加熱炉内壁の材質はSUS310S又はチタン合金等
の耐熱合金を用いていた為1000℃以上の温度で長
時間使用することは、炉材の耐久性の点より不可
能とされていた。 Conventionally, a direct heating furnace using a gas burner has been used as a heating furnace for producing expanded graphite, but since the inner wall of this direct heating furnace is made of heat-resistant alloys such as SUS310S or titanium alloy, it can withstand temperatures of over 1000℃. It was considered impossible to use it for a long time due to the durability of the furnace material.
ガスバーナーによる直接加熱炉では、熱の付与
が瞬間的である為1000℃以下の温度での加熱では
膨張に必要な熱が不十分となり、一部で未膨張黒
鉛が発生する場合があつた。この為膨張黒鉛をシ
ートに成形した後、フレームで再加熱し未膨張黒
鉛を膨張させる必要があつた。 In direct heating furnaces using gas burners, heat is applied instantaneously, so heating at temperatures below 1000°C may not provide enough heat for expansion, resulting in unexpanded graphite being generated in some areas. For this reason, it was necessary to form the expanded graphite into a sheet and then reheat it in a frame to expand the unexpanded graphite.
一方、膨張の為の加熱温度を1200℃以上にする
と、熱量が十分である為直接加熱膨張においても
未膨張を発生せず、再加熱処理の必要がなくな
る。しかし、1200℃以上の高温で連続使用するた
めには鋼材では耐久性に無理がある。発明者等は
種々検討した結果、加熱炉の内壁を耐熱性のよい
シリカアルミナ系の塗布物層又はシリカアルミナ
系無機繊維の成形品を用いる構成にすることによ
り1200℃以上の加熱膨張を可能とし、再加熱処理
を行なわずに良好な黒鉛を得ることが可能である
ことを見出した。 On the other hand, when the heating temperature for expansion is set to 1200° C. or higher, the amount of heat is sufficient so that no unexpanded state occurs even in direct heating and expansion, eliminating the need for reheating treatment. However, steel materials are not durable enough for continuous use at high temperatures of 1200°C or higher. As a result of various studies, the inventors have found that heating expansion of 1200°C or higher is possible by configuring the inner wall of the heating furnace with a coated layer of silica-alumina or a molded product of silica-alumina inorganic fiber, which has good heat resistance. discovered that it is possible to obtain good graphite without reheating.
本発明は、層間化合物を形成した黒鉛をバーナ
ーの炎で加熱膨張させる炉において、内壁にシリ
カ・アルミナ系塗布物層又はシリカ・アルミナ系
無機繊維の成形品を用いた膨張黒鉛製造炉に関す
る。 The present invention relates to an expanded graphite production furnace that uses a silica/alumina coating layer or a molded product of silica/alumina inorganic fibers on the inner wall in a furnace in which graphite with an intercalation compound formed thereon is heated and expanded by a burner flame.
本発明の膨張黒鉛製造炉は袋管の閉管部に層間
化合物を形成した黒鉛（酸処理黒鉛）吹き出し用
のノズル及びガスバーナーを配設したもので、袋
管の内部にノズルの先端及びガスバーナーの先端
を近接させて配置し、ガスバーナーにより炉内を
所定温度に保持し、ガスバーナーよりのフレーム
に対してノズルより酸処理黒鉛を吹き付けて酸処
理黒鉛を膨張させる。炉内の温度は未膨張黒鉛が
残らないように1200℃以上にすることが好まし
い。また炉の内壁は高温での繰返し使用に耐える
シリカ・アルミナ系塗布物層又はシリカ・アルミ
ナ系無機繊維の成形品を使用する。シリカ・アル
ミナ系の塗布物層はシリカ及びアルミナを主成分
とする泥漿を繰返し炉の内壁に塗布したり、あら
かじめ上記泥漿を用いてスリツプキヤステイング
法により製した袋管を所定寸法に加工する等によ
り得る。シリカ・アルミナ系無機繊維の成形品
は、シリカ及びアルミナを主成分とする無機繊維
と無機結合剤とを混合したのち成形及び焼成した
ものを用いる。 The expanded graphite production furnace of the present invention is equipped with a nozzle and a gas burner for blowing out graphite (acid-treated graphite) in which an intercalation compound has been formed in the closed part of a bag tube. The tips of the furnaces are placed close to each other, the inside of the furnace is maintained at a predetermined temperature by a gas burner, and acid-treated graphite is sprayed from a nozzle onto the frame from the gas burner to expand the acid-treated graphite. The temperature inside the furnace is preferably 1200° C. or higher so that no unexpanded graphite remains. The inner wall of the furnace is made of a silica/alumina coated layer or a silica/alumina inorganic fiber molded product that can withstand repeated use at high temperatures. The silica/alumina coating layer can be obtained by repeatedly applying a slurry mainly composed of silica and alumina to the inner wall of a furnace, or by processing a bag tube made in advance by the slip casting method using the slurry to the specified dimensions. obtained by. The silica/alumina-based inorganic fiber molded product is obtained by mixing inorganic fibers mainly composed of silica and alumina with an inorganic binder, then molding and firing.
以下比較例及び実施例について説明する。 Comparative examples and examples will be explained below.
比較例
第１図は従来の膨張黒鉛製造炉の要部断面図
で、厚さ５mmのSUS310S耐熱鋼板１の横形円筒
状の袋管内壁の外側に厚さ50mmの保温材（イソラ
イト工業製、商品名カオウール）を貼り付けた。
炉内温度はガスバーナー３により1000℃以下に調
節し、ノズル４から酸処理黒鉛をフレーム９に吹
き付けて上記黒鉛を瞬間的に膨張させ取出し口５
より取出す。この炉で得られた膨張黒鉛は６％の
未膨張黒鉛を含有していた。Comparative Example Figure 1 is a cross-sectional view of the main parts of a conventional expanded graphite manufacturing furnace, in which a 50 mm thick heat insulating material (manufactured by Isolite Industries, Ltd. The famous Kao Wool) was pasted.
The temperature inside the furnace is adjusted to 1000 degrees Celsius or lower using the gas burner 3, and acid-treated graphite is sprayed onto the frame 9 from the nozzle 4 to cause the graphite to expand instantly
Take it out. The expanded graphite obtained in this furnace contained 6% unexpanded graphite.
実施例
第２図は本発明の一実施例になる横形円筒状の
膨張黒鉛製造炉の要部断面図である。厚さ50mmの
シリカ・アルミナ系塗布物層（旭硝子製、商品名
キヤスターCA―16）からなる耐熱内壁８の外側
に保温材７（旭硝子製、商品名軽量キヤスター
LC10）を巻き付け、更に最外部は炉の強度を保
つ為に4.5mmのSS41鋼板からなる補強材６を配し
た構造とした。この炉の炉内温度をガスバーナー
３により1500℃に保持し、比較例と同様にしてノ
ズル４から酸処理黒鉛をフレーム９に吹き付けて
膨張させた。得られた膨張黒鉛中には未膨張のも
のは見られなかつた。Embodiment FIG. 2 is a sectional view of a main part of a horizontal cylindrical expanded graphite production furnace according to an embodiment of the present invention. A heat insulating material 7 (manufactured by Asahi Glass Co., Ltd., product name: Lightweight Caster) is placed on the outside of a heat-resistant inner wall 8 consisting of a 50 mm thick silica/alumina coating layer (manufactured by Asahi Glass Co., Ltd., product name: Caster CA-16).
LC10) was wrapped around the furnace, and a reinforcing material 6 made of 4.5mm SS41 steel plate was placed on the outermost layer to maintain the strength of the furnace. The temperature inside the furnace was maintained at 1500° C. by the gas burner 3, and acid-treated graphite was blown onto the frame 9 from the nozzle 4 and expanded in the same manner as in the comparative example. No unexpanded graphite was found in the expanded graphite obtained.
本発明によれば炉内温度を従来炉よりも高くす
ることが出来るので未膨張の黒鉛を含むことがな
く従つてシート等に成形後の再膨張処理工程が不
要になる。 According to the present invention, since the temperature inside the furnace can be made higher than that of conventional furnaces, unexpanded graphite is not included, and therefore a re-expansion treatment step after forming into a sheet or the like is not necessary.
また、本発明の膨張黒鉛製造炉は２年間使用し
ても劣化せず従来の膨張黒鉛製造炉の内壁の寿命
約50時間よりも耐久性の点で格段に優れる。 Further, the expanded graphite production furnace of the present invention does not deteriorate even after two years of use, and is much superior in durability to the approximately 50-hour lifespan of the inner walls of conventional expanded graphite production furnaces.
第１図は従来の膨張黒鉛製造炉の要部断面図及
び第２図は本発明の一実施例になる膨張黒鉛製造
炉の要部断面図である。
符号の説明 １…耐熱鋼板、２…保温材、３…
ガスバーナー、４…ノズル、５…取出し口、６…
補強材、７…保温材、８…耐熱内壁、９…フレー
ム。
FIG. 1 is a sectional view of a main part of a conventional expanded graphite manufacturing furnace, and FIG. 2 is a sectional view of a main part of an expanded graphite manufacturing furnace according to an embodiment of the present invention. Explanation of symbols 1...Heat-resistant steel plate, 2...Heat insulation material, 3...
Gas burner, 4... nozzle, 5... outlet, 6...
Reinforcing material, 7... Heat insulating material, 8... Heat resistant inner wall, 9... Frame.
Claims (1)
加熱膨張させる炉において、内壁にシリカ・アル
ミナ系塗布物層又はシリカ・アルミナ系無機繊維
の成形品を用いた膨張黒鉛製造炉。1. An expanded graphite manufacturing furnace that uses a silica/alumina coating layer or a molded product of silica/alumina inorganic fibers on the inner wall in a furnace that heats and expands graphite with an interlayer compound formed thereon using a burner flame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57179620A JPS5969413A (en) | 1982-10-13 | 1982-10-13 | Furnace for manufacturing expanded graphite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57179620A JPS5969413A (en) | 1982-10-13 | 1982-10-13 | Furnace for manufacturing expanded graphite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5969413A JPS5969413A (en) | 1984-04-19 |
| JPS6261528B2 true JPS6261528B2 (en) | 1987-12-22 |
Family
ID=16068937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57179620A Granted JPS5969413A (en) | 1982-10-13 | 1982-10-13 | Furnace for manufacturing expanded graphite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5969413A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0662285B2 (en) * | 1988-09-22 | 1994-08-17 | 工業技術院長 | Method for producing elastic graphite body |
| RU2176217C1 (en) * | 2001-02-12 | 2001-11-27 | Усошин Владимир Аполлонович | Method and plant for production of sorbent based on thermally expanded graphite |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3584846A (en) * | 1969-11-14 | 1971-06-15 | Lyle E Mccoy | Heating apparatus for elongate material |
-
1982
- 1982-10-13 JP JP57179620A patent/JPS5969413A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3584846A (en) * | 1969-11-14 | 1971-06-15 | Lyle E Mccoy | Heating apparatus for elongate material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5969413A (en) | 1984-04-19 |
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