【０００１】[0001]
【発明の属する技術分野】本発明は、焼結造粒物、例え
ば造粒物を発泡焼結させた人工軽量骨材の製造方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sintered granulated product, for example, an artificial lightweight aggregate obtained by subjecting a granulated product to foam sintering.
【０００２】[0002]
【従来の技術及びその課題】従来、人工軽量骨材を製造
するにあたっては、膨張性けつ岩或いは膨張性粘土を粉
砕或いは解砕して粉末とした後造粒し、該造粒物をロー
タリキルン等によって焼成することにより製造されてい
る。2. Description of the Related Art Conventionally, in producing an artificial lightweight aggregate, expansive shale or expansive clay is pulverized or crushed into powder and then granulated, and the granulated material is rotary kiln. It is manufactured by sintering.
【０００３】ここで、膨張性けつ岩或いは膨張性粘土等
の粉末原料を造粒するにあたっては、成形性及びハンド
リング性を考慮し、該粉末原料に水、及び必要に応じて
ベントナイト、水ガラス等の粘結剤を添加混合して含水
率を１０〜３０％程度に調湿しながら、パン型のペレタ
イザー等で造粒することがなされている。[0003] When granulating a powder material such as expansive shale or expansive clay, water and, if necessary, bentonite, water glass, etc. are added to the powder material in consideration of formability and handling properties. The mixture is granulated with a bread-type pelletizer or the like while adding and mixing the binder and adjusting the moisture content to about 10 to 30%.
【０００４】しかし、この様な造粒直後の高い含水率の
造粒物を、そのままロータリキルンに投入して焼成する
こととすると、造粒物中に存在する水分の急激な蒸発に
より造粒物が爆裂、破壊され、焼成後の製品歩留りが悪
くなる。そこで、従来においては、造粒物の焼成前に該
造粒物を乾燥機等を使って充分（例えば、含水率１％以
下）に乾燥することが成されていた。However, if such a granulated material having a high moisture content immediately after granulation is directly charged into a rotary kiln and calcined, the granulated material is rapidly evaporated due to rapid evaporation of water present in the granulated material. Explodes and breaks, resulting in a poor product yield after firing. Therefore, conventionally, prior to firing the granules, the granules have been sufficiently dried (for example, a water content of 1% or less) using a drier or the like.
【０００５】この造粒物の乾燥は、例えば電気エネルギ
ーを使用した乾燥機によって、５０〜２００℃で１〜５
時間かけて行われるものであったため、電気エネルギー
を大量に消費し、製造コストを高騰させていたと共に、
この乾燥工程は、乾燥条件によっては長時間を要するた
めに製造上のネック工程ともなっていた。The granules are dried at a temperature of 50 to 200 ° C. for 1 to 5 by a dryer using electric energy, for example.
Because it took time, it consumed large amounts of electrical energy, increased production costs,
Since this drying step requires a long time depending on the drying conditions, it has also been a bottleneck step in production.
【０００６】本発明は、上述した従来の焼結造粒物の製
造方法が有していた課題に鑑み成されたものであって、
その目的は、焼成前の造粒物の乾燥を、不要或いは従来
の乾燥時間に比して極端に短い乾燥時間で済む焼結造粒
物の製造方法を提供することにある。なお、製紙スラッ
ジを造粒し易い含水率とするため、及び造粒粒径を制御
するために生石灰を添加する技術（実開昭４８−６９８
２１）、或いはフライアッシュ、都市ゴミ焼却灰及び／
又は下水汚泥焼却灰の焼結造粒物を製造するにあたっ
て、該焼結造粒物を高強度のものとするために生石灰を
添加する技術（特開平７−２０６４９１、特開平８−２
１７５０１）は存在するが、これらの技術の目的と上記
した本発明の目的とは根本的に相違する。The present invention has been made in view of the problems of the above-described conventional method for producing a sintered granulated product,
An object of the present invention is to provide a method for producing a sintered granulated product in which drying of the granulated product before firing is unnecessary or requires only an extremely short drying time as compared with the conventional drying time. In addition, a technique of adding quicklime to the papermaking sludge to obtain a water content that facilitates granulation and to control the granulated particle size (Japanese Utility Model Application Laid-Open No. 48-698).
21) or fly ash, municipal waste incineration ash and / or
Alternatively, in producing sintered granules of sewage sludge incineration ash, a technique of adding quicklime to make the sintered granules high in strength (Japanese Patent Laid-Open Nos. 7-206491, 8-2).
17501) exists, but the purpose of these techniques is fundamentally different from the object of the present invention described above.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記した目的
を達成するため、無機質粉末を主体とする原料粉末に、
生石灰を含む脱水材を１０wt％以上添加混合して造粒し
た後、該造粒物を焼成して焼結造粒物を製造する焼結造
粒物の製造方法とした。ここで、上記無機質粉末として
は、膨張性けつ岩、膨張性粘土、真珠岩粉末、フライア
ッシュ粉末、焼却灰、廃ガラス粉末、或いはこれらの混
合物等が挙げられる。According to the present invention, there is provided a raw material powder mainly composed of an inorganic powder,
A dewatering material containing quicklime was added and mixed in an amount of 10% by weight or more and granulated, and then the granulated product was fired to produce a sintered granulated product. Here, examples of the inorganic powder include expansive shale, expansive clay, perlite, fly ash powder, incinerated ash, waste glass powder, and mixtures thereof.
【０００８】上記した本発明にかかる焼結造粒物の製造
方法によれば、粉末原料を造粒するにあたって必須とな
る水の他、該水の存在により水和反応を起こして発熱す
る生石灰を含む脱水材を粉末原料に１０wt％以上添加混
合して造粒することとしたため、従来と同様に適度な水
の存在により粉末原料を支障なく造粒できると共に、生
石灰を含む脱水材の存在により造粒途中において水が徐
々に生石灰等との水和反応に消費され、また生石灰等の
水和反応による発熱によって蒸発し、低含水率の造粒物
を造粒できる。そのため、該造粒物を乾燥することな
く、或いは従来の乾燥時間に比して極端に短い乾燥時間
で乾燥させた後、焼成しても造粒物が爆裂、破壊する憂
いが少ない。According to the method for producing a sintered granulated product according to the present invention described above, in addition to water essential for granulating a powder raw material, quicklime which generates a hydration reaction due to the presence of the water and generates heat is produced. The powdered raw material containing 10% by weight or more is added to the powdered raw material and granulated, so that the powdered raw material can be granulated without any trouble as in the past as well as the dewatering material containing quicklime, as in the past. During the granulation, water is gradually consumed by the hydration reaction with quick lime and the like, and is evaporated by the heat generated by the hydration reaction of quick lime and the like, whereby a granulated product having a low water content can be granulated. Therefore, even if the granulated material is dried without drying or after being dried for an extremely short drying time as compared with the conventional drying time, the granulated material is less likely to explode or break.
【０００９】ここで、上記水と共に無機質粉末を主体と
する原料粉末に添加混合する生石灰を含む脱水材として
は、該脱水材中に生石灰を３０〜７０wt％含むものが好
ましい。これは、生石灰の含有量が３０wt％に満たない
脱水材では、原料粉末に添加する脱水材の総量を著しく
多くしないと脱水効果が現れないためであり、逆に生石
灰の含有量が７０wt％を越える脱水材では、安定した造
粒物が得られ難く、人工軽量骨材のような発泡焼結物を
得ようとした場合、良品を歩留り良く製造することがで
きないためである。このような、生石灰を含む脱水材と
しては、仮焼ドロマイト等の他、生石灰を上記配合にな
るように再生セメント、セメントダスト、都市ゴミ焼却
灰、或いは下水汚泥焼却灰等に添加混合した人工の混合
物でも良いが、中でもセメント焼成系のサスペンション
プレヒーターから分取された生石灰を含むセメントクリ
ンカーの中間焼成品は好ましい。これは、セメント焼成
系のサスペンションプレヒーターから分取された生石灰
を含むセメントクリンカーの中間焼成品は、セメント製
造工程から容易に分取でき、入手が容易であると共に安
価であり、しかもシリカ分やアルミナ分が含まれている
ため、これらと生石灰等の他成分が造粒工程で若干水和
し、ハンドリング性の良い造粒物が得られるためであ
る。The dehydrated material containing quicklime which is added to and mixed with the raw material powder mainly composed of an inorganic powder together with the water is preferably a dehydrated material containing 30 to 70% by weight of quicklime. This is because a dehydrated material having a content of quicklime less than 30 wt% does not produce a dewatering effect unless the total amount of the dehydrated material added to the raw material powder is significantly increased. This is because a stable granulated product is difficult to obtain with a dehydrated material that exceeds the above, and a non-defective product cannot be manufactured with high yield when obtaining a foamed sintered product such as an artificial lightweight aggregate. As such a dehydrated material containing quicklime, in addition to calcined dolomite, etc., artificial lime added and mixed with recycled cement, cement dust, municipal waste incineration ash, or sewage sludge incineration ash so that the above-mentioned composition is obtained. Although a mixture may be used, an intermediate calcined cement clinker containing quicklime separated from a cement calcining suspension preheater is particularly preferable. This is because the intermediate fired product of cement clinker containing quick lime separated from the cement pre-suspension suspension preheater can be easily separated from the cement production process, is easily available and inexpensive, and has a silica content and This is because the alumina component is contained, and these components and other components such as quicklime are slightly hydrated in the granulation step, and a granulated material having good handling properties is obtained.
【００１０】また、原料粉末に添加混合する上記生石灰
を含む脱水材の割合は、１０wt％以上とする必要があ
る。これは、無機質粉末を主体とする原料粉末に対する
上記生石灰を含む脱水材の添加混合割合が１０wt％に満
たない量では、造粒物中の水分を十分脱水させることが
できず、得られた造粒物を、その後乾燥することなく、
或いは従来の乾燥時間に比して極端に短い乾燥時間で乾
燥させた後、焼成しても造粒物が爆裂、破壊する憂いが
少ないほどの低含水率とすることができないためであ
る。なお、生石灰を含む脱水材として、上記セメント焼
成系のサスペンションプレヒーターから分取された生石
灰を含むセメントクリンカーの中間焼成品を使用した場
合には、上記造粒工程において１０〜５０wt％の割合で
無機質粉末を主体とする原料粉末に添加混合することが
好ましい。これは、無機質粉末を主体とする原料粉末に
対する上記生石灰を含むセメントクリンカーの中間焼成
品の添加混合割合が５０wt％を越える量では、生石灰等
の水和膨張により造粒物にマイクロクラックが入る等し
て安定した造粒物が得られ難いためである。The proportion of the dehydrated material containing quick lime to be added to and mixed with the raw material powder must be 10 wt% or more. If the mixing ratio of the dehydrated material containing quicklime to the raw material powder mainly composed of inorganic powder is less than 10% by weight, the water in the granulated product cannot be sufficiently dehydrated, and the resulting granulated material cannot be sufficiently dehydrated. Without drying the granules afterwards,
Alternatively, even after drying in an extremely short drying time as compared with the conventional drying time, the granulated material cannot be reduced to a low moisture content such that there is little fear of explosion or destruction. In the case where an intermediate calcined product of cement clinker containing calcined lime separated from the cement calcination suspension preheater is used as the dehydrated material containing calcined lime, the granulation step has a ratio of 10 to 50 wt%. It is preferable to add and mix the raw material powder mainly composed of inorganic powder. This is because, when the mixing ratio of the intermediate calcined cement clinker containing quicklime to the raw material powder mainly composed of inorganic powder exceeds 50 wt%, microcracks are formed in the granulated material due to hydration expansion of quicklime and the like. This makes it difficult to obtain a stable granulated product.
【００１１】また、上記本発明にかかる焼結造粒物の製
造方法は、特に膨張性けつ岩或いは膨張性粘土を造粒
し、焼成することにより製造する人工軽量骨材の製造
に、その製造にかかる費用を削減できるために好適に利
用できる。なお、本発明で言う焼結造粒物とは、造粒物
を焼成し、該造粒物の少なくとも一部を焼結させたもの
を言い、発泡焼結物も含まれる。The method for producing a sintered granulated product according to the present invention is particularly suitable for producing an artificial lightweight aggregate produced by granulating and firing expansible shale or expansive clay. It can be used favorably because the cost required for can be reduced. The term “sintered granulated product” as used in the present invention refers to a product obtained by firing a granulated product and sintering at least a part of the granulated product, and includes a foamed sintered product.
【００１２】[0012]
【発明の実施の形態】以下、上記した本発明にかかる焼
結造粒物（人工軽量骨材）の製造方法の一実施の形態を
説明する。先ず、例えば膨張性けつ岩等の原料をボール
ミル，竪型ミル，クラッシャ等の粉砕機を利用して粉砕
し、平均粒径１００μｍ程度の原料粉末とした後、該原
料粉末に、生石灰を含む脱水材を１０wt％以上、好まし
くはセメント焼成系のサスペンションプレヒーターから
分取された生石灰を含むセメントクリンカーの中間焼成
品を１０〜５０wt％、必要に応じて粘結剤としてベント
ナイトを最多で１０wt％、水を造粒物中の合計量が１０
〜３０wt％になるように添加し、ミキサー，二軸混練機
等の混合機を利用して十分に混合する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a method for producing a sintered granulated product (artificial lightweight aggregate) according to the present invention will be described. First, a raw material such as expansive shale is pulverized using a pulverizer such as a ball mill, a vertical mill or a crusher to obtain a raw material powder having an average particle diameter of about 100 μm. 10 to 50% by weight, preferably 10 to 50% by weight of an intermediate calcined product of cement clinker containing quick lime fractionated from a cement pre-suspension suspension preheater, and up to 10% by weight of bentonite as a binder if necessary. When the total amount of water in the granulated product is 10
-30% by weight, and sufficiently mixed using a mixer such as a mixer or a twin-screw kneader.
【００１３】続いて、この調湿された原料粉末を、直ぐ
さまパン型ペレタイザー，エキストルーダー等の造粒機
を使用し、適宜散水しながら平均粒径２０ｍｍ程度の造
粒物に成形した後、該造粒物を乾燥することなく、ロー
タリーキルンによって焼成・発泡焼結させ、焼結造粒物
である人工軽量骨材を製造する。このロータリーキルン
を用いた造粒物の焼成・発泡焼結条件は、焼成温度１０
５０〜１３００℃程度で、ロータリーキルン内における
滞留時間１５〜６０ｍｉｎ程度で行えば良い。Subsequently, the conditioned raw material powder is immediately formed into a granulated product having an average particle size of about 20 mm using a granulating machine such as a pan-type pelletizer or an extruder while appropriately spraying water. The granulated product is fired and foamed and sintered by a rotary kiln without drying to produce an artificial lightweight aggregate that is a sintered granulated product. The conditions for firing and foaming and sintering the granules using this rotary kiln are as follows:
What is necessary is just to carry out at about 50-1300 degreeC and residence time in a rotary kiln about 15-60 minutes.
【００１４】上記した焼結造粒物の製造方法を実施する
ことにより、造粒工程においては、従来と同様に適度な
水の存在により原料粉末を支障なく造粒できると共に、
生石灰を含む脱水材（例えば、セメント焼成系のサスペ
ンションプレヒーターから分取された生石灰を含むセメ
ントクリンカーの中間焼成品）の存在により造粒途中に
おいて水が徐々に生石灰等との水和反応に消費され、ま
た生石灰等の水和反応による発熱によって蒸発し、低含
水率の造粒物を造粒できる。そのため、該造粒物を乾燥
することなく焼成しても、造粒物が爆裂、破壊する憂い
が少なく、歩留り良く焼結造粒物を製造できる。By carrying out the above-mentioned method for producing a sintered granulated product, in the granulating step, the raw material powder can be granulated without any problem by the presence of a suitable amount of water as in the conventional case.
Due to the presence of a dehydrated material containing quicklime (eg, an intermediate fired product of cement clinker containing quicklime separated from a cement firing suspension preheater), water is gradually consumed in the hydration reaction with quicklime etc. during granulation. Also, it is evaporated by the heat generated by the hydration reaction of quicklime or the like, and a granulated product having a low water content can be granulated. Therefore, even if the granulated product is fired without drying, the granulated product is less likely to explode or break, and a sintered granulated product can be produced with good yield.
【００１５】[0015]
【試験例】以下、上記した本発明にかかる焼結造粒物
（人工軽量骨材）の製造方法を見出した試験例につき、
より具体的に説明する。Test Examples Hereinafter, test examples in which a method for producing a sintered granulated product (artificial lightweight aggregate) according to the present invention as described above will be described.
This will be described more specifically.
【００１６】なお、以下の試験例においては、原料粉末
としては、平均粒径１００μｍ程度にボールミルを用い
て粉砕された淡路島産の膨張性けつ岩を使用し、生石灰
を含む脱水材としては、太平洋セメント株式会社のセメ
ント焼成系のサスペンションプレヒーターから分取され
た生石灰を含むセメントクリンカーの中間焼成品（以
下、単に「セメントクリンカーの中間焼成品」と言
う。）、また半硬焼の仮焼ドロマイトを使用した。この
セメントクリンカーの中間焼成品の主な成分は、ＳｉＯ
２：１９．０％、Ａｌ２Ｏ３：４．３％、Ｆｅ２Ｏ３：
２．７％、ＣａＯ：６０．５％、ＭｇＯ：１．５％であ
り、また、仮焼ドロマイトの主な成分は、ＭｇＯ：４２
％、ＣａＯ：５８％であり、共に生石灰を十分に含有し
たものであった。また、奥多摩鉱業株式会社製の純粋な
生石灰も脱水材として使用した。また、上記原料粉末
と、脱水材、粘結剤としてのベントナイト、そして水と
の混合には、二軸混練機を用いて１０ｍｉｎ程度行っ
た。更に、造粒物の成形には、ペレタイザーを使用し、
平均粒径２０ｍｍ程度の造粒物を成形し、該造粒物を乾
燥することなくロータリーキルンに投入し、焼成温度１
１５０℃程度で、滞留時間２０ｍｉｎ程度で造粒物の焼
成・発泡焼結を行った。In the following test examples, the raw material powder used was expandable shale from Awajishima ground using a ball mill to an average particle size of about 100 μm, and the dehydrated material containing quicklime was Pacific Ocean. An intermediate calcined product of cement clinker containing quick lime fractionated from a cement pre-suspension suspension pre-heater of Cement Co., Ltd. It was used. The main component of this cement clinker intermediate fired product is SiO
2: 19.0%, Al 2 O 3: 4.3%, Fe 2 O 3:
2.7%, CaO: 60.5%, MgO: 1.5%, and the main component of the calcined dolomite is MgO: 42
% And CaO: 58%, both of which contained quicklime sufficiently. Pure quick lime manufactured by Okutama Mining Co., Ltd. was also used as a dewatering material. The mixing of the raw material powder, a dehydrating material, bentonite as a binder, and water was performed for about 10 minutes using a twin-screw kneader. Furthermore, use a pelletizer to mold the granules,
A granulated product having an average particle size of about 20 mm is formed, and the granulated product is put into a rotary kiln without drying, and a firing temperature of 1
The granulated material was fired and foamed and sintered at about 150 ° C. for a residence time of about 20 minutes.
【００１７】〔試験例１〜２４〕上記原料粉末に対し、
表１に記載した種々の重量割合で、上記脱水材、粘結剤
及び水の一部を上記混合機を用いて混合し、得られた混
合物を直ちに上記造粒機を使用して適宜散水しながら造
粒した後、ロータリーキルンによって各々上記条件で造
粒物を焼成・発泡焼結させ、人工軽量骨材を製造した。[Test Examples 1 to 24]
At the various weight ratios described in Table 1, the dehydrating material, the binder and a part of the water were mixed using the mixer, and the resulting mixture was immediately watered appropriately using the granulator. After granulation, the granulated product was fired and foamed and sintered by the rotary kiln under the above conditions to produce an artificial lightweight aggregate.
【００１８】上記人工軽量骨材の製造方法を評価するた
め、各造粒物の成形性、及び各造粒物の焼成・発泡焼結
後の歩留りを各々測定した。なお、歩留りは、製造過程
で破壊せずに得られた人工軽量骨材の造粒物全体に対す
る割合で示した。測定結果を、表１に併記する。In order to evaluate the method for producing the artificial lightweight aggregate, the formability of each granulated product and the yield after firing and foam sintering of each granulated product were measured. In addition, the yield was shown by the ratio with respect to the whole granulated material of the artificial lightweight aggregate obtained without breaking in the manufacturing process. Table 1 also shows the measurement results.
【００１９】[0019]
【表１】[Table 1]
【００２０】上記試験により、膨張性けつ岩の粉末に、
水と共に生石灰を含む脱水材を適量添加混合して造粒す
ることとすると（試験例４〜１２及び１６〜１９）、造
粒物の成形性に影響を与えることなく、低含水率の造粒
物を造粒でき、該造粒物を乾燥することなくロータリー
キルンによって焼成・発泡焼結させても、人工軽量骨材
を歩留り良く製造できることが分かった。According to the above test, expansive shale powder was
When an appropriate amount of a dehydrated material containing quicklime is added and mixed with water to perform granulation (Test Examples 4 to 12 and 16 to 19), granulation with a low water content is performed without affecting the formability of the granulated product. It was found that an artificial lightweight aggregate could be produced with good yield even if the granulated product could be granulated and the granulated product was fired and foamed and sintered by a rotary kiln without drying.
【００２１】また、生石灰を含む脱水材の膨張性けつ岩
粉末への添加混合割合が、１０wt％に満たない場合（試
験例１〜３，１５）は、低含水率の造粒物が得られず、
乾燥することなく該造粒物をロータリーキルンによって
焼成・発泡焼結させると、多くの造粒物が爆裂、破壊
し、歩留りが悪くなることが分かった。When the mixing ratio of the dehydrated material containing quicklime to the expansive shale powder is less than 10 wt% (Test Examples 1 to 3 and 15), granules having a low water content can be obtained. Without
When the granules were fired and foamed and sintered by a rotary kiln without drying, it was found that many granules exploded and broken, resulting in poor yield.
【００２２】更に、生石灰を含む脱水材としてセメント
クリンカーの中間焼成品を使用した場合は、該セメント
クリンカーの中間焼成品の膨張性けつ岩粉末への添加混
合割合が５０wt％を越えると（試験例１３，１４）、造
粒工程において生石灰の水和発熱が程良く起こらず、造
粒物の成形性に悪影響が生じ、歩留りが悪くなることか
ら好ましくないことが分かった。Further, when an intermediate calcined product of cement clinker is used as a dehydrated material containing quicklime, if the mixing ratio of the intermediate calcined product of cement clinker to the expansive shale powder exceeds 50 wt% (Test Example) 13, 14), it has been found that the heat of hydration of quicklime does not occur appropriately in the granulation process, which adversely affects the formability of the granulated product and reduces the yield, which is not preferable.
【００２３】また、脱水材として純粋な生石灰を使用し
た場合（試験例２０〜２４）は、造粒物の成形性が安定
せず、やはり歩留りが悪くなることから好ましくないこ
とが分かった。It was also found that when pure quicklime was used as the dewatering material (Test Examples 20 to 24), the formability of the granulated product was not stable, and the yield was unfavorably lowered.
【００２４】[0024]
【発明の効果】以上、説明した本発明にかかる焼結造粒
物の製造方法によれば、低含水率の造粒物を造粒でき、
焼成前の造粒物の乾燥工程を不要、或いは極端に短くで
きる効果がある。According to the method for producing a sintered granulated product according to the present invention described above, a granulated product having a low water content can be granulated.
There is an effect that the step of drying the granulated material before firing is unnecessary or extremely short.
フロントページの続き (72)発明者 山下 一彦 大阪府大阪市西成区南津守２−３−18 太 平洋セメント株式会社内 Ｆターム(参考） 4G004 AA03 JA02 LA01 NA02Continuation of the front page (72) Inventor Kazuhiko Yamashita 2-3-18 Minamitsumori, Nishinari-ku, Osaka-shi, Osaka Taiheiyo Cement Co., Ltd. F-term (reference) 4G004 AA03 JA02 LA01 NA02
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11008296AJP2000203958A (en) | 1999-01-14 | 1999-01-14 | Production of sintered granule |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11008296AJP2000203958A (en) | 1999-01-14 | 1999-01-14 | Production of sintered granule |
| Publication Number | Publication Date |
|---|---|
| JP2000203958Atrue JP2000203958A (en) | 2000-07-25 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11008296APendingJP2000203958A (en) | 1999-01-14 | 1999-01-14 | Production of sintered granule |
| Country | Link |
|---|---|
| JP (1) | JP2000203958A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100857510B1 (en) | 2007-06-01 | 2008-09-08 | 한국건설기술연구원 | Artificial aggregate for high strength concrete with fire resistance and its manufacturing method |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100857510B1 (en) | 2007-06-01 | 2008-09-08 | 한국건설기술연구원 | Artificial aggregate for high strength concrete with fire resistance and its manufacturing method |
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