JPH01160609A - Manufacture of expanded graphite sheet - Google Patents
Manufacture of expanded graphite sheetInfo
- Publication number
- JPH01160609A JPH01160609A JP32047887A JP32047887A JPH01160609A JP H01160609 A JPH01160609 A JP H01160609A JP 32047887 A JP32047887 A JP 32047887A JP 32047887 A JP32047887 A JP 32047887A JP H01160609 A JPH01160609 A JP H01160609A
- Authority
- JP
- Japan
- Prior art keywords
- graphite
- expanded graphite
- impurities
- expansion
- expanded
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 60
- 239000010439 graphite Substances 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000005096 rolling process Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 22
- 239000007770 graphite material Substances 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 20
- 239000002994 raw material Substances 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 7
- 230000005484 gravity Effects 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 238000007873 sieving Methods 0.000 description 12
- 239000002245 particle Substances 0.000 description 7
- 238000000746 purification Methods 0.000 description 6
- 238000000790 scattering method Methods 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- 235000011835 quiches Nutrition 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000004062 sedimentation 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
Landscapes
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、天然黒鉛、または溶銑予備処理から発生する
キッシュグラファイト等の黒鉛を原料とし、これを圧延
して膨張黒鉛シートを製造する方法に関するものである
。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing an expanded graphite sheet by rolling natural graphite or graphite such as quiche graphite generated from hot metal pretreatment as a raw material. It is something.
天然黒鉛や上記キッシュグラファイト等にはＳｉ。 Natural graphite and the above-mentioned quiche graphite contain Si.
Ｃａ、 Ｆｅ等の不純物が含まれており、また膨張処理
後の黒鉛には、加熱膨張処理の前処理として行う薬品処
理における薬品の浸漬不充分な黒鉛、生れの悪い黒鉛な
どが含まれている。これらの不純物が含まれたままの膨
張黒鉛をシート状に成形した場合、シートの強度が低下
し、シートｉ面の美感も悪化するから、これら不純物等
は極力除去する必要がある。It contains impurities such as Ca and Fe, and the graphite after expansion treatment contains graphite that has not been immersed in chemicals sufficiently in the chemical treatment performed as a pretreatment for heating and expansion treatment, and graphite that is poorly formed. . If expanded graphite containing these impurities is formed into a sheet, the strength of the sheet will decrease and the aesthetic appearance of the i-side of the sheet will also deteriorate, so it is necessary to remove these impurities as much as possible.
従来、かかる不純物等の除去は、原料精製直後か上記薬
品処理の直後に篩い分けすることにより行っていた。Conventionally, such impurities and the like have been removed by sieving immediately after raw material purification or immediately after the above-mentioned chemical treatment.
しかし上記不純物除去に当り乾式で篩い分けを行う方法
では、上記不純物等と正常の黒鉛粒子との間に比重およ
び粒度の差がほとんど見られないため、篩い分けが不充
分であった。However, in the dry sieving method for removing the impurities, there is almost no difference in specific gravity and particle size between the impurities and normal graphite particles, so sieving is insufficient.
他方、湿式篩い分け（水洗法、加圧浮上法、強制沈降法
等）は篩い分は効率が良く、一般に行われているが、乾
燥等の後処理が必要となり、コスト高となる。On the other hand, wet sieving (water washing method, pressurized flotation method, forced sedimentation method, etc.) has good sieving efficiency and is commonly performed, but it requires post-processing such as drying and is expensive.
そこで本発明の目的は、不純物等を黒鉛から効率良く、
かつ経済的に除去する方法を提供することにある。Therefore, the purpose of the present invention is to efficiently remove impurities from graphite.
The object of the present invention is to provide an economical method for removing such substances.
上記問題点を解決するための本発明は、黒鉛原料を、加
熱膨張炉において膨張処理し、得られる膨張黒鉛を圧延
して膨張黒鉛シートを製造する方法において、上記膨張
処理後でかつ圧延前において上記膨張黒鉛の乾式篩い分
けを行うことを特徴とするものである。To solve the above problems, the present invention provides a method for manufacturing an expanded graphite sheet by subjecting graphite raw material to expansion treatment in a heating expansion furnace and rolling the obtained expanded graphite, after the expansion treatment and before rolling. This method is characterized in that the expanded graphite is subjected to dry sieving.
本発明では、黒鉛原料からの不純物等の除去を、加熱膨
張処理後において乾式篩い分けを行う点に特徴がある。The present invention is characterized in that impurities and the like are removed from the graphite raw material by dry sieving after heating and expansion treatment.
該膨張処理後は、良黒鉛は膨張し嵩密度が小さく粒度が
大きくなるのに対して、不純物等は膨張せず嵩密度や粒
度はもとのままの状態を維持するから、良黒鉛と不純物
との嵩密度と粒度における差が大となる。したがって、
この膨張処理後であれば乾式であっても容易にかつ効率
よく不純物を篩い分けることができる。After the expansion treatment, good graphite expands and has a small bulk density and a large particle size, while impurities do not expand and maintain their bulk density and particle size as they were. There is a large difference in bulk density and particle size. therefore,
After this expansion treatment, impurities can be easily and efficiently screened out even in a dry method.
さらに、圧延前に上記篩い分けを行うこととしているの
で、良黒鉛のみを圧延に供することができ、均質で表面
の美観の優れた膨張黒鉛シートを得ることができる。Furthermore, since the above-mentioned sieving is performed before rolling, only good graphite can be subjected to rolling, and an expanded graphite sheet that is homogeneous and has an excellent surface appearance can be obtained.
以下、本発明を図面に基づきさらに具体的に説明する。 Hereinafter, the present invention will be explained in more detail based on the drawings.
第１図において、黒鉛原料１には、加熱膨張性のいわゆ
る良黒鉛の他に、加熱非膨張性のＳｔ、 Ｃａ、 Ｆｅ
等の不純物や生れの悪い黒鉛が含まれている。この黒鉛
原料１は、薬品処理２された後、膨張炉３において加熱
膨張処理すると、前記良黒鉛は膨張するのに対して不純
物等は膨張しないため、良黒鉛と不純物とで比重と粒度
が大きく異なることになり、乾式の篩い分けが容易とな
る。そこで膨張炉３から出た膨張黒鉛１を振動スクリー
ン４により微振動を与えながら篩い分けを行い、不純物
等（篩下孔）ＩＢを除去する。次いで実質的に良黒鉛の
みからなる膨張黒鉛（篩下孔）ＩＡを予備成形機５の下
り勾配の予備成形用ベルト５１と搬送ベルト５２との間
に供し予備成形を行う。In FIG. 1, the graphite raw material 1 includes, in addition to heat-expandable so-called good graphite, non-heat-expandable St, Ca, and Fe.
Contains impurities such as and poor quality graphite. When this graphite raw material 1 is subjected to chemical treatment 2 and then heated and expanded in an expansion furnace 3, the good graphite expands while the impurities do not, so the specific gravity and particle size of the good graphite and impurities are large. This makes dry sieving easier. Therefore, the expanded graphite 1 discharged from the expansion furnace 3 is sieved with a vibrating screen 4 while being subjected to slight vibrations to remove impurities (holes under the sieve) IB. Next, expanded graphite (sieve holes) IA consisting essentially of good graphite is provided between the downwardly inclined preforming belt 51 of the preforming machine 5 and the conveyor belt 52 to perform preforming.
次にこの膨張黒鉛ＩＡを主圧延ロール６．７，８゜９対
間を通して主圧延を行い、得られるシート状の膨張黒鉛
ＩＡを巻取ロール１０によって巻取り、製品とする。な
お、上記主圧延ロール６．７間には、圧延効率の低下を
防止するため加熱装置１１を設け、再加熱を行うのが好
ましい。また上記振動スクリーンの例としては、「モー
ゲンセンサイザー」のような確率篩や「ソニクリーン」
のような超音波による微振動篩等が適用できる。Next, this expanded graphite IA is subjected to main rolling through nine pairs of main rolling rolls 6.7 and 8°, and the obtained sheet-like expanded graphite IA is wound up with a winding roll 10 to form a product. Note that it is preferable to provide a heating device 11 between the main rolling rolls 6 and 7 to perform reheating in order to prevent reduction in rolling efficiency. In addition, examples of the above-mentioned vibrating screens include stochastic sieves such as ``Mogensensizer'' and ``Sonicleen.''
A micro-vibration sieve using ultrasonic waves such as the one shown in FIG.
第２図は、上記篩い分は法として空気飛散法を用いたも
のである。第１図と同様の処理をした黒鉛原料を膨張炉
３に供給し、加熱膨張させる。次いで膨張炉３から出た
膨張黒鉛１が空気流分級機１２内のノズル１３より噴出
された空気により飛散される過程で膨張しなかった比重
の大きな不純物等はスクリーン１４を介して下方へ篩下
孔ＩＢとして排出され、膨張したため比重の小さくなっ
た良黒鉛ＩＡは下方に沈降せず空気流に乗って前方の予
備成形機５まで達せられる。１部の超微粉はスクリーン
１５を介して図示しない集塵機へ送られる。膨張黒鉛Ｉ
Ａはその後第１図と同様にして成形されシート製品とな
る。In FIG. 2, the air scattering method was used as the sieving method. A graphite raw material treated in the same manner as shown in FIG. 1 is supplied to an expansion furnace 3 and is heated and expanded. Next, in the process in which the expanded graphite 1 discharged from the expansion furnace 3 is scattered by the air ejected from the nozzle 13 in the air classifier 12, impurities with large specific gravity that did not expand are sieved downward through the screen 14. The good graphite IA, which is discharged as holes IB and whose specific gravity has become smaller due to expansion, does not settle downward, but is carried by the air flow to the preforming machine 5 in front. A portion of the ultrafine powder is sent through a screen 15 to a dust collector (not shown). Expanded graphite I
A is then molded into a sheet product in the same manner as shown in FIG.
上記空気流分級機１２は特に限定はしないが、回転翼を
用いて分級するものは、膨張した黒鉛を破壊するので好
ましくない。The air classifier 12 is not particularly limited, but one that uses rotary blades for classification is not preferred because it destroys expanded graphite.
なお、上述の通り本発明では振動スクリーン法、空気飛
散法のいずれも適用可能であるが、特に膨張度の高い、
すなわち強度の弱い黒鉛に対しては、空気飛散法が望ま
しい。As mentioned above, in the present invention, both the vibrating screen method and the air scattering method can be applied, but in particular,
In other words, the air scattering method is preferable for graphite, which has low strength.
また、膨張炉室後にホッパーを設けて一旦貯留した後、
上記のように圧延工程へ供する過程で篩い分けする方法
やそのホッパー自体をサイクロン等の空気分級機として
篩い分けする方法も本発明に含まれる。In addition, a hopper is installed after the expansion furnace chamber to temporarily store the
The present invention also includes a method of sieving during the process of subjecting to the rolling process as described above, and a method of sieving by using the hopper itself as an air classifier such as a cyclone.
次に実施例により本発明の効果を明らかにする。 Next, the effects of the present invention will be clarified through examples.
まず、従来法による黒鉛の精製結果を粒度等と共に第１
表に示す。First, the results of refining graphite using the conventional method, along with the particle size etc.
Shown in the table.
次に本発明による振動スクリーン法による膨張。Next, expansion by the vibrating screen method according to the present invention.
黒鉛の精製結果を第２表、第３表に示す。第２表。The graphite purification results are shown in Tables 2 and 3. Table 2.
第３表はそれぞれ１ｍ／ｍ 、 ０．５ｍ／ｍの綾織
スクリーンを使用した場合の結果である。Table 3 shows the results when using 1 m/m and 0.5 m/m twill screens, respectively.
なお、使用したスクリーンの大きさは５００巾Ｘ １０
００長、傾斜角は１０″、振巾は１０１１φ、振動数は
７６０ｒｐｍとした。The size of the screen used was 500 width x 10
00 length, the inclination angle was 10'', the swing width was 1011φ, and the vibration frequency was 760 rpm.
次に本発明において空気飛散法を使用した場合の精製結
果を第４表に示す。ただし、分級点は０．５．使用空気
量は３ｍ’／ｍｉｎ＋ 空気速度は０．５ｍ／ｓｅｃ
であった。Next, Table 4 shows the purification results when the air scattering method was used in the present invention. However, the classification point is 0.5. The amount of air used is 3m'/min+ The air velocity is 0.5m/sec
Met.
従来法（第１表）における精製後の黒鉛中の５ｉ０２．
Ａ Ｅ ２０：ｌ 、 ＰｅｚＯｚの含量と本発明
による振動スクリーン法（１ｍ／ｍ）（第２表）のそれ
らの含量とを比較すると、例えば、第１表の精製黒鉛中
のＳｉｎｇのｉ＝０．８（％）であるのに対し、本発明
法（第２表）の篩上品のＳｉＯ□量−０，４（％）であ
り、本発明法の方が精製効率の高いことがわかった。同
様に、Ａ ｊ２２０３１ ＦｅｚＯ３についても、また
振動スクリーン法（０，５ｍ／ｍ） （第３表）、空
気飛散法（第４表）についても従来法（第１表）と比較
して、精製効率が向上していることがわかった。5i02. in graphite after purification in the conventional method (Table 1).
Comparing the contents of A E 20:l, PezOz with their contents in the vibrating screen method according to the invention (1 m/m) (Table 2), for example Sing's i=0 in purified graphite in Table 1 .8 (%), whereas the amount of SiO□ in the sieve material of the method of the present invention (Table 2) was -0.4 (%), indicating that the method of the present invention has a higher purification efficiency. . Similarly, the purification efficiency of A j22031 FezO3, the vibrating screen method (0.5 m/m) (Table 3), and the air scattering method (Table 4) was also improved compared to the conventional method (Table 1). was found to be improving.
以上の通り、本発明によれば、不純物等を黒鉛から効率
良く、かつ経済的に除去でき、もって均質かつ表面の美
観の優れた膨張黒鉛シートを得ることができる。As described above, according to the present invention, impurities and the like can be efficiently and economically removed from graphite, thereby making it possible to obtain an expanded graphite sheet that is homogeneous and has an excellent surface appearance.
第１図は本発明の振動スクリーン法による実施例の概要
図、第２図は本発明の他の空気飛散法による実施例の概
要図である。
１・・・黒鉛原料、１′・・・膨張黒鉛、ＩＡ・・・篩
上品、ＩＢ・・・篩下品、ＩＡ’・・・膨張黒鉛シート
、２・・・薬品処理、３・・・膨張炉、４・・・スクリ
ーン、５・・・予備成形機、６，７．８．９・・・主圧
延ロール、１０・・・巻取ロール、１１・・・加熱装置
、１２・・・空気分級器、１３・・・ノズル、１４・・
・スクリーン。FIG. 1 is a schematic diagram of an embodiment using the vibrating screen method of the present invention, and FIG. 2 is a schematic diagram of an embodiment using another air scattering method of the present invention. 1... Graphite raw material, 1'... Expanded graphite, IA... Sieved product, IB... Sieved product, IA'... Expanded graphite sheet, 2... Chemical treatment, 3... Expanded Furnace, 4... Screen, 5... Preforming machine, 6, 7.8.9... Main rolling roll, 10... Winding roll, 11... Heating device, 12... Air Classifier, 13... Nozzle, 14...
·screen.
Claims (1)
られる膨張黒鉛を圧延して膨張黒鉛シートを製造する方
法において、上記膨張処理後でかつ圧延前において上記
膨張黒鉛の乾式篩い分けを行うことを特徴とする膨張黒
鉛シートの製造方法。(1) In a method of manufacturing an expanded graphite sheet by subjecting graphite material to expansion treatment in a heating expansion furnace and rolling the obtained expanded graphite, the expanded graphite is dry sieved after the expansion treatment and before rolling. A method for manufacturing an expanded graphite sheet, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32047887A JPH01160609A (en) | 1987-12-18 | 1987-12-18 | Manufacture of expanded graphite sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32047887A JPH01160609A (en) | 1987-12-18 | 1987-12-18 | Manufacture of expanded graphite sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01160609A true JPH01160609A (en) | 1989-06-23 |
Family
ID=18121890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32047887A Pending JPH01160609A (en) | 1987-12-18 | 1987-12-18 | Manufacture of expanded graphite sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01160609A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6406612B1 (en) | 1999-05-20 | 2002-06-18 | Graftech Inc. | Expandable graphite and method |
| US6669919B1 (en) | 2000-11-16 | 2003-12-30 | Advanced Energy Technology Inc. | Intercalated graphite flakes exhibiting improved expansion characteristics and process therefor |
| RU2686906C1 (en) * | 2018-01-30 | 2019-05-06 | Общество с ограниченной ответственностью "Силур" | Method of evaluating quality of thermal expanded of graphite |
-
1987
- 1987-12-18 JP JP32047887A patent/JPH01160609A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6406612B1 (en) | 1999-05-20 | 2002-06-18 | Graftech Inc. | Expandable graphite and method |
| US6669919B1 (en) | 2000-11-16 | 2003-12-30 | Advanced Energy Technology Inc. | Intercalated graphite flakes exhibiting improved expansion characteristics and process therefor |
| RU2686906C1 (en) * | 2018-01-30 | 2019-05-06 | Общество с ограниченной ответственностью "Силур" | Method of evaluating quality of thermal expanded of graphite |
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