JPH07187731A - Cement clinker manufacturing method - Google Patents
Cement clinker manufacturing methodInfo
- Publication number
- JPH07187731A JPH07187731A JP5327470A JP32747093A JPH07187731A JP H07187731 A JPH07187731 A JP H07187731A JP 5327470 A JP5327470 A JP 5327470A JP 32747093 A JP32747093 A JP 32747093A JP H07187731 A JPH07187731 A JP H07187731A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- cement clinker
- cement
- component
- composite material
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
(57)【要約】
【目的】 有機成分及び無機成分から成る複合材をセメ
ントクリンカー原料と共に原料の一部及び焼成燃料の一
部として再利用することにより、省資源及び省エネルギ
ーが可能で、且つ、アルカリ骨材反応や金属腐食を起こ
し難いセメントを得る為のセメントクリンカーの製造方
法を提供することを目的とする。
【構成】 Ｎａ2 ＯとＫ2 Ｏの合計含有量が５重量％以
下であるガラス成分１０〜４０重量％、Ｎａ2 ＯとＫ2
Ｏの合計含有量が１．５重量％以下であって塩素の含有
量が０．０５重量％以下である硅砂成分４０〜８０重量
％及び樹脂成分１０〜６０重量％とから成る複合材をセ
メントクリンカー原料と共に焼成することを特徴とする
セメントクリンカーの製造方法。(57) [Summary] [Objective] By reusing a composite material consisting of an organic component and an inorganic component together with a cement clinker raw material as a part of the raw material and a part of the burning fuel, resource saving and energy saving are possible, and It is an object of the present invention to provide a method for producing a cement clinker for obtaining a cement that is unlikely to cause alkali-aggregate reaction and metal corrosion. [Structure] 10 to 40% by weight of a glass component having a total content of Na 2 O and K 2 O of 5% by weight or less, Na 2 O and K 2
Cement composite material consisting of 40-80% by weight silica sand component and 10-60% by weight resin component with a total O content of 1.5% by weight or less and a chlorine content of 0.05% by weight or less. A method for producing a cement clinker, which comprises firing with a clinker raw material.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えばガラス繊維強化
レジンコンクリート、ガラス繊維強化プラスチック等の
複合材廃棄物の再利用によるセメントクリンカーの製造
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing cement clinker by recycling composite material waste such as glass fiber reinforced resin concrete and glass fiber reinforced plastic.
【０００２】[0002]
【従来の技術】従来、例えばガラス繊維強化レジンコン
クリート、ガラス繊維強化プラスチック等の複合材から
成形体を得る時のクズ、工事残材、使用済み品等の廃棄
物の処理方法としては、廃棄物を破砕して埋め立てする
か、又は廃棄物を焼却して有機成分を除去したのち無機
成分を埋め立てする方法しか無いのが実態である。これ
は、上記複合材の廃棄物が有機成分及び無機成分を含む
複数の成分から成り、これら各成分を分別回収すること
が困難であり、従って有効に再利用する適切な方法が無
かった事による。2. Description of the Related Art Conventionally, as a method for treating wastes such as scraps, construction residual materials and used products when a molded product is obtained from a composite material such as glass fiber reinforced resin concrete and glass fiber reinforced plastic The actual situation is that the only method is to crush and reclaim land, or to incinerate waste to remove organic components and then reclaim inorganic components. This is because the waste material of the composite material is composed of a plurality of components including an organic component and an inorganic component, and it is difficult to separately collect each of these components, and therefore, there was no suitable method for effectively reusing them. .
【０００３】しかし、上記従来の処理方法には、破砕処
理や焼却処理に費用がかかる、適当な埋め立て場所が乏
しい等の問題点がある。However, the above-mentioned conventional treatment methods have problems that the crushing treatment and the incineration treatment are expensive, and that there is no suitable landfill site.
【０００４】一方、セメントの製造は、天然資源を原料
として用いると共に、高いエネルギーを必要とするの
で、資源の再利用も含めた省資源、省エネルギーを出来
るだけ図る必要がある。On the other hand, since the production of cement requires high energy as well as using natural resources as raw materials, it is necessary to save resources and energy including recycling of resources as much as possible.
【０００５】又、セメントから成形体を得た後、アルカ
リ骨材反応が発生したり、鉄筋コンクリートとして使用
した時に鉄筋腐食を防止する為に、セメント中の全アル
カリ量及び塩素量を極力低く抑える事が必要である。そ
こで塩素を含まぬクズプラスチックを燃料としてセメン
トクリンカーを製造する方法が提案されている（特開昭
４７−３９１２４号公報）。Further, after obtaining a molded product from cement, the total amount of alkali and chlorine in the cement should be kept as low as possible in order to prevent alkali-aggregate reaction and corrosion of reinforcing bars when used as reinforced concrete. is necessary. Therefore, a method of producing a cement clinker using a waste plastic containing no chlorine as a fuel has been proposed (Japanese Patent Laid-Open No. 47-39124).
【０００６】[0006]
【発明が解決しようとする課題】本発明は、上記欠点に
鑑み、有機成分及び無機成分から成る複合材をセメント
クリンカー原料と共に原料の一部及び焼成燃料の一部と
して再利用することにより、省資源及び省エネルギーが
可能で、且つ、アルカリ骨材反応や金属腐食を起こし難
いセメントを得る為の、セメントクリンカーの製造方法
を提供することを目的とする。In view of the above-mentioned drawbacks, the present invention conserves energy by reusing a composite material composed of an organic component and an inorganic component together with a cement clinker raw material as a part of the raw material and a part of the burned fuel. It is an object of the present invention to provide a method for producing a cement clinker for obtaining a cement that can save resources and energy and that is unlikely to cause alkali-aggregate reaction and metal corrosion.
【０００７】[0007]
【課題を解決するための手段】本発明のセメントクリン
カーの製造方法は、Ｎａ2 ＯとＫ2 Ｏの合計含有量が５
重量％以下であるガラス成分１０〜４０重量％、Ｎａ2
ＯとＫ2 Ｏの合計含有量が１．５重量％以下であって塩
素の含有量が０．０５重量％以下である硅砂成分４０〜
８０重量％及び有機成分１０〜６０重量％とから成る複
合材をセメントクリンカー原料と共に焼成することを特
徴とし、そのことにより上記目的が達成される。尚、以
下、「重量％」は「％」と記す。The method for producing a cement clinker according to the present invention has a total content of Na 2 O and K 2 O of 5 or less.
10 to 40% by weight of glass component, Na 2
Silica sand component 40 having a total content of O and K 2 O of 1.5% by weight or less and a chlorine content of 0.05% by weight or less
A composite material consisting of 80% by weight and 10 to 60% by weight of an organic component is characterized by being fired together with a cement clinker raw material, whereby the above object is achieved. In the following, "% by weight" will be referred to as "%".
【０００８】本発明のセメントクリンカーの製造方法に
おいては、上記複合材中の無機成分であるガラス成分と
硅砂成分は他の無機成分と共に焼成されてセメントクリ
ンカーとなり、セメント原料の一つとして再利用され
る。又、有機成分である樹脂成分はセメントクリンカー
焼成時の燃料の一部として再利用される。In the method for producing cement clinker of the present invention, the glass component and the silica sand component which are the inorganic components in the above composite material are fired together with other inorganic components to form the cement clinker, which is reused as one of the cement raw materials. It Further, the resin component, which is an organic component, is reused as a part of the fuel at the time of firing the cement clinker.
【０００９】本発明においては、前述の如く、複合材中
の１０〜４０％を占めるガラス成分のＮａ2 ＯとＫ2 Ｏ
の合計含有量は多くなると最終的に得られる成形体のア
ルカリ骨材反応を促進するため５％以下であることが必
要であり、例えばガラス繊維の場合、全アルカリ量が１
％以下であるＥガラス、ＥＣＲガラス及びＳガラス等は
好適に用いられるが、Ｎａ2 Ｏ含有量が約８．５％と高
いＣガラスは使用出来ない。In the present invention, as described above, the glass components Na 2 O and K 2 O, which account for 10 to 40% of the composite material, are used.
When the total content of the above is large, it is necessary to be 5% or less in order to accelerate the alkali-aggregate reaction of the finally obtained molded body. For example, in the case of glass fiber, the total alkali content is 1%.
%, The E glass, ECR glass, S glass and the like are preferably used, but C glass having a high Na 2 O content of about 8.5% cannot be used.
【００１０】又、複合材中の４０〜８０％を占める硅砂
成分のＮａ2 ＯとＫ2 Ｏの合計含有量は１．５％以下、
塩素の含有量は多くなると鉄筋の腐食を促進するため
０．０５％以下であることが必要であり、例えば全アル
カリ量、塩素量ともに多い海岸の砂等は硅砂分として使
用出来ない。Further, the total content of silica particles Na 2 O and K 2 O, which accounts for 40 to 80% in the composite material, is 1.5% or less,
When the content of chlorine is large, it is necessary to be 0.05% or less in order to promote the corrosion of the reinforcing bar. For example, coastal sand having a large total alkali content and a large chlorine content cannot be used as silica sand.
【００１１】本発明において、複合材中の１０〜６０％
を占める樹脂成分の種類は、特に限定されるものではな
く、不飽和ポリエステル樹脂、エポキシ樹脂、フェノー
ル樹脂等の熱硬化性樹脂及びそれらの硬化剤やポリエチ
レン樹脂、ポリプロピレン樹脂等の熱可塑性樹脂等が好
適に用いられる。In the present invention, 10 to 60% of the composite material
The type of resin component occupying is not particularly limited, and unsaturated polyester resins, epoxy resins, thermosetting resins such as phenol resins and their curing agents and polyethylene resins, thermoplastic resins such as polypropylene resins, etc. It is preferably used.
【００１２】例えば、樹脂成分として不飽和ポリエステ
ル樹脂を１０〜６０％含有する複合材を用いる場合、７
００〜４３００ｋｃａｌ／ｋｇの熱利用が可能であり、
省エネルギーに寄与する。For example, when a composite material containing 10 to 60% of unsaturated polyester resin as a resin component is used,
It is possible to use heat of 00-4300 kcal / kg,
Contribute to energy saving.
【００１３】又、本発明において用いる複合材中には、
本発明の目的を阻害しない範囲で必要に応じ、炭酸カル
シウム、クレー、タルク等の無機充填剤、着色顔料、安
定剤等の添加剤が適当量含有されていても良い。In the composite material used in the present invention,
If necessary, additives such as calcium carbonate, clay, talc and other inorganic fillers, color pigments, stabilizers and the like may be contained in appropriate amounts as long as the object of the present invention is not impaired.
【００１４】本発明においては、セメントクリンカー原
料中に占める上記複合材の含有量は、特に限定されるも
のではないが、０．１〜６０％程度が好ましく、なかで
も１０〜３０％程度がより好ましい。複合材の含有量が
０．１％程度未満であると複合材を用いる意味が無く、
逆に６０％程度を超えるとセメントクリンカーの成分調
整を他の無機原料で行うことが困難となる。In the present invention, the content of the composite material in the cement clinker raw material is not particularly limited, but is preferably about 0.1 to 60%, and more preferably about 10 to 30%. preferable. If the content of the composite material is less than about 0.1%, it makes no sense to use the composite material,
On the other hand, if it exceeds about 60%, it becomes difficult to adjust the components of the cement clinker with other inorganic raw materials.
【００１５】セメントクリンカー原料として上記複合材
と共に用いられる他の無機原料としては、石灰石、粘
土、硅石、酸化鉄等、一般的にセメントクリンカー原料
として用いられるものが挙げられ、複合材と共に所定の
セメントクリンカーの成分となるように配合されて用い
られる。Other inorganic raw materials used as the cement clinker raw material together with the above-mentioned composite material include limestone, clay, silica stone, iron oxide and the like which are generally used as the cement clinker raw material, and a predetermined cement together with the composite material. It is used by being blended so as to be a component of the clinker.
【００１６】上記セメントクリンカー原料は、約１５０
０℃前後に加熱された焼成炉中で常法により焼成され、
排出、冷却されてセメントクリンカーとなる。The above cement clinker raw material is about 150
Firing in a firing furnace heated to around 0 ° C. by a conventional method,
It is discharged and cooled to become cement clinker.
【００１７】本発明の製造方法においては、複合材の焼
成炉への投入方法は、特に限定されるものではなく、複
合材を破砕もしくは粉砕して直接焼成炉へ投入しても良
いし、又、破砕もしくは粉砕した複合材を上記他の無機
原料と予め混合して焼成炉へ投入しても良いが、均一な
セメントクリンカーを得る為には後者の方がより好まし
い。In the manufacturing method of the present invention, the method of charging the composite material into the firing furnace is not particularly limited, and the composite material may be crushed or crushed and directly charged into the firing furnace. The crushed or crushed composite material may be mixed with the above-mentioned other inorganic raw material in advance and charged into the firing furnace, but the latter is more preferable in order to obtain a uniform cement clinker.
【００１８】本発明において用いられる上記焼成炉の種
類は、特に限定されるものではないが、均一な加熱と熱
分解ガスのスムースな排出を行う為には回転機構を有す
る焼成炉を使用するのが望ましく、焼成の主燃料として
は、石炭、重油等一般的に用いられるものを用いれば良
い。又、焼成温度は、約１５００℃前後の通常のセメン
トクリンカー製造時の温度で良い。The type of the firing furnace used in the present invention is not particularly limited, but in order to perform uniform heating and smooth discharge of the pyrolysis gas, a firing furnace having a rotating mechanism is used. However, as the main fuel for calcination, commonly used fuels such as coal and heavy oil may be used. Further, the firing temperature may be a temperature of about 1500 ° C. during the usual production of cement clinker.
【００１９】上記により製造されたセメントクリンカー
は、所定量の石膏、高炉スラグ、フライアッシュ等を配
合して、仕上げミルで微粉砕することにより、所望のセ
メントとすることが出来る。The cement clinker produced as described above can be made into a desired cement by mixing a predetermined amount of gypsum, blast furnace slag, fly ash and the like and finely pulverizing it with a finishing mill.
【００２０】[0020]
【作用】本発明の製造方法は、ガラス成分、硅砂成分及
び樹脂成分から成る複合材をセメントクリンカーの原料
の一部及び焼成時の燃料の一部として再利用するので、
省資源及び省エネルギーが可能となる。又、上記複合材
中の全アルカリ量及び塩素量を一定量以下に設定してい
るので、得られるセメントクリンカーから作成されるセ
メントは、アルカリ骨材反応や金属腐食を起こし難い。In the production method of the present invention, since the composite material composed of the glass component, the silica sand component and the resin component is reused as a part of the raw material of the cement clinker and a part of the fuel at the time of firing,
Resources and energy can be saved. Further, since the total amount of alkali and chlorine in the composite material are set to be equal to or less than a certain amount, the cement prepared from the obtained cement clinker is unlikely to cause alkali-aggregate reaction and metal corrosion.
【００２１】[0021]
【００２２】以下に本発明の実施例を説明する。図１は
本発明の製造方法に用いられる焼成炉の１例を示す説明
図である。Examples of the present invention will be described below. FIG. 1 is an explanatory diagram showing an example of a firing furnace used in the manufacturing method of the present invention.
【００２３】（実施例）(Example)
【００２４】Ｎａ2 Ｏの含有量が約０．１％及びＫ2 Ｏ
の含有量が約０．４％であるＥガラスのガラス繊維「ロ
ービングＲＳ２４０ＰＥ−５３５」（日東紡績社製）１
９％、Ｎａ2 Ｏの含有量が約０．０８％、Ｋ2 Ｏの含有
量が約０．１３％及び塩素の含有量が約０．０１５％で
ある硅砂７号５８％及び不飽和ポリエステル樹脂「ポリ
マール３７２」（武田薬品工業社製）２３％から成るガ
ラス繊維強化プラスチック複合材を破砕し粉砕してガラ
ス繊維強化複合材の粉末を得た。得られた複合材粉末の
全アルカリ含有量は０．２１５％、塩素含有量は０．０
０８７％であった。The content of Na 2 O is about 0.1% and K 2 O
Glass fiber "Roving RS240PE-535" (manufactured by Nitto Boseki Co., Ltd.) of E glass having a content of about 0.4% 1
9%, Na 2 O content of about 0.08%, K 2 O content of about 0.13% and chlorine content of about 0.015% Silica sand No. 58% and unsaturated polyester A glass fiber reinforced plastic composite material consisting of 23% of resin "Polymer 372" (manufactured by Takeda Chemical Industries, Ltd.) was crushed and crushed to obtain a glass fiber reinforced composite powder. The total alkali content of the obtained composite powder is 0.215%, the chlorine content is 0.0
It was 087%.
【００２５】上記ガラス繊維強化複合材の粉末と石灰
石、粘土（カオリン）、硅石、及び酸化鉄とを表１に示
す配合組成で混合しセメントクリンカー原料を作成し
た。尚、用いた各原料の化学組成は表１に示されるとお
りであった。又、強熱減量はＪＩＳ Ｋ−００６７に準
じて測定した。A powder of the above glass fiber reinforced composite material, limestone, clay (kaolin), silica and iron oxide were mixed in the composition shown in Table 1 to prepare a cement clinker raw material. The chemical composition of each raw material used was as shown in Table 1. The loss on ignition was measured according to JIS K-0067.
【００２６】図１に示される、傾斜した回転する焼成炉
１内がバーナ４により約１５００℃に加熱されている焼
成炉１の原料投入口２から上記セメントクリンカー原料
を原料の投入方向ａに投入した。投入後、不飽和ポリエ
ステル樹脂の熱分解ガスの大部分は燃焼し、一部熱分解
ガスは熱分解ガスの排出口５から二次燃焼炉６に移り完
全燃焼した。一方、無機原料は焼成されて焼成物の排出
口３から排出され、冷却固化してセメントクリンカーを
得た。The cement clinker raw material is fed in the raw material feeding direction a from the raw material feeding port 2 of the firing furnace 1 in which the inside of the inclined and rotating firing furnace 1 shown in FIG. 1 is heated to about 1500 ° C. by the burner 4. did. After the charging, most of the pyrolysis gas of the unsaturated polyester resin was burned, and part of the pyrolysis gas was transferred from the pyrolysis gas discharge port 5 to the secondary combustion furnace 6 and completely burned. On the other hand, the inorganic raw material was calcined and discharged from the calcined product discharge port 3, cooled and solidified to obtain a cement clinker.
【００２７】次いで、上記セメントクリンカーと表１に
示される化学組成を有する石膏を表１に示す配合組成で
混合し、常法により仕上げミルで微粉砕して普通ポルト
ランドセメントを得た。得られた普通ポルトランドセメ
ントの全アルカリ含有量は０．１５％、塩素含有量は
０．００２６％であった。Then, the cement clinker and gypsum having the chemical composition shown in Table 1 were mixed in the composition shown in Table 1 and finely pulverized by a finishing mill by a conventional method to obtain ordinary Portland cement. The resulting ordinary Portland cement had a total alkali content of 0.15% and a chlorine content of 0.0026%.
【００２８】[0028]
【表１】 [Table 1]
【００２９】[0029]
【発明の効果】以上述べたように、本発明によるセメン
トクリンカーの製造方法は、複合材を原料及び燃料の一
部として再利用するので、省エネルギー及び省資源が可
能となる。又、該セメントクリンカーから得られるセメ
ントは、アルカリ骨材反応や金属腐食を起こし難い高品
質のものである。As described above, in the method for producing a cement clinker according to the present invention, since the composite material is reused as a part of the raw material and the fuel, it is possible to save energy and resources. Further, the cement obtained from the cement clinker is of high quality which is unlikely to cause alkali-aggregate reaction or metal corrosion.
【００３０】[0030]
【図１】本発明のセメントクリンカーの製造方法に用い
る焼成炉の一例を示す説明図である。FIG. 1 is an explanatory diagram showing an example of a firing furnace used in the method for producing a cement clinker of the present invention.
【符号の説明】 １ 焼成炉 ２ 原料の投入口 ３ 焼成物の排出口 ４ バーナ ５ 熱分解ガスの排出口 ６ 二次燃焼炉 ７ 排気ガスの排出口 ａ 原料の投入方向 ｂ 焼成物の排出方向 ｃ 主燃料の投入方向 ｄ 熱分解ガスの排出方向 ｅ 排気ガスの排出方向[Explanation of symbols] 1 firing furnace 2 raw material input port 3 burned material discharge port 4 burner 5 pyrolysis gas discharge port 6 secondary combustion furnace 7 exhaust gas discharge port a raw material input direction b burned product discharge direction c Main fuel injection direction d Pyrolysis gas discharge direction e Exhaust gas discharge direction
Claims (1)
％以下であるガラス成分１０〜４０重量％、Ｎａ2 Ｏと
Ｋ2 Ｏの合計含有量が１．５重量％以下であって塩素の
含有量が０．０５重量％以下である硅砂成分４０〜８０
重量％及び樹脂成分１０〜６０重量％とから成る複合材
をセメントクリンカー原料と共に焼成することを特徴と
するセメントクリンカーの製造方法。1. A glass component having a total content of Na 2 O and K 2 O of 5% by weight or less and 10 to 40% by weight, and a total content of Na 2 O and K 2 O of 1.5% by weight or less. Silica sand component having a chlorine content of 0.05% by weight or less
A method for producing a cement clinker, which comprises firing a composite material comprising 10% by weight of a resin component and 10 to 60% by weight of a resin component together with a cement clinker raw material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5327470A JPH07187731A (en) | 1993-12-24 | 1993-12-24 | Cement clinker manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5327470A JPH07187731A (en) | 1993-12-24 | 1993-12-24 | Cement clinker manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07187731A true JPH07187731A (en) | 1995-07-25 |
Family
ID=18199522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5327470A Pending JPH07187731A (en) | 1993-12-24 | 1993-12-24 | Cement clinker manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07187731A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001342045A (en) * | 2000-05-29 | 2001-12-11 | Taiheiyo Cement Corp | Method of manufacturing cement clinker |
-
1993
- 1993-12-24 JP JP5327470A patent/JPH07187731A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001342045A (en) * | 2000-05-29 | 2001-12-11 | Taiheiyo Cement Corp | Method of manufacturing cement clinker |
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