JPH1067571A - Production of hydraulic alumina - Google Patents
Production of hydraulic aluminaInfo
- Publication number
- JPH1067571A JPH1067571A JP8222490A JP22249096A JPH1067571A JP H1067571 A JPH1067571 A JP H1067571A JP 8222490 A JP8222490 A JP 8222490A JP 22249096 A JP22249096 A JP 22249096A JP H1067571 A JPH1067571 A JP H1067571A
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- hydraulic
- gibbsite
- hydraulic alumina
- lithium salt
- 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.)
- Granted
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
- C04B7/32—Aluminous cements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Products (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は水硬性アルミナの製
造方法に関する。更に詳細には、それ自身単独で耐火物
を形成し得る、或いは他の骨材成分と混合・成形して耐
火物組成物等を形成し得るに優れたバインダー能を有す
る水硬性アルミナの製造方法に関するもので、特に早硬
性を有する水硬性アルミナの製造方法に関するものであ
る。The present invention relates to a method for producing hydraulic alumina. More specifically, a method for producing a hydraulic alumina having an excellent binder ability to form a refractory by itself or to mix and mold with other aggregate components to form a refractory composition or the like More particularly, the present invention relates to a method for producing a hydraulic alumina having an early setting property.
【０００２】[0002]
【従来の技術】各種耐火物成形体のバインダーとしては
アルミナセメント、粘土等各種の無機結合材が使用され
ている。その中でも、少なくとも部分的に再水和性を有
するアルミナは、実質的にＣａ分を含まないため、高温
耐熱性や耐Ｃｌ性が優れている等の特長が知られている
（特公昭５７−７５９０号公報）。再水和性を有するア
ルミナは，アルミナセメントに比較してこのような特長
を有するものの、硬化速度の温度依存性が大きいため、
冬季の施工時に硬化が不十分であったり、逆に夏季にお
いては成形型に流し込む前に流動性を失うとの問題があ
った。2. Description of the Related Art Various inorganic binders such as alumina cement and clay are used as binders for various refractory moldings. Among them, alumina having at least partially rehydration properties does not substantially contain Ca, and is known to have features such as excellent high-temperature heat resistance and excellent Cl resistance (Japanese Patent Publication No. 57-57). No. 7590). Alumina, which has rehydration properties, has these characteristics compared to alumina cement, but because of the large temperature dependence of the curing rate,
There has been a problem that the hardening is insufficient during the construction in winter or the fluidity is lost before pouring into the mold in summer.
【０００３】これらの問題を解決するため再水和性を有
するアルミナに、硬化調整剤を添加する方法が知られて
いる（特開昭５６−９２７２号公報）。たとえば、硬化
促進剤としてはＬｉ塩、アルミナセメント、アルミナセ
メント水和物、アルカリ金属水酸化物、アルカリ土類金
属水酸化物、粘土類等が挙げられており、可使時間延長
剤としては、気化性シリカ、分散剤、ポリリン酸類、ア
ミノカルボン酸類、オキシアミノカルボン酸類、カルボ
ン酸やオキシカルボン酸類又はそれらの塩類、塩化アル
ミニウム類、石膏、少糖類、多価アルコール、食塩ある
いはリン酸化合物等が提示されている。[0003] In order to solve these problems, there is known a method of adding a curing modifier to alumina having rehydration properties (Japanese Patent Application Laid-Open No. 56-9272). For example, as a hardening accelerator, Li salt, alumina cement, alumina cement hydrate, alkali metal hydroxide, alkaline earth metal hydroxide, clays and the like are listed. Vaporizable silica, dispersing agents, polyphosphoric acids, aminocarboxylic acids, oxyaminocarboxylic acids, carboxylic acids and oxycarboxylic acids or salts thereof, aluminum chlorides, gypsum, oligosaccharides, polyhydric alcohols, salt or phosphoric acid compounds, etc. Has been presented.
【０００４】[0004]
【発明が解決しようとする課題】耐火組成物のなかに硬
化促進剤を添加・混合する上記方法でも一定の効果は見
られるが、なお所望とする十分な硬化促進効果は得られ
なかった。このような事情に鑑み、本発明者等は比較的
低温域に於いても、水と混合して硬化せしむるときの硬
化時間が短くできる水硬性アルミナの製造方法を得るべ
く鋭意研究を重ねた結果、特定の硬化促進剤を水硬性ア
ルミナの特定の製造過程で添加存在せしめ、さらに処理
する場合には、上記課題を満足する水硬性アルミナが得
られることを見出し、本発明を完成するに至った。Although the above-described method of adding and mixing a curing accelerator in a refractory composition has a certain effect, it has not been possible to obtain a desired sufficient curing acceleration effect. In view of such circumstances, the present inventors have conducted intensive studies to obtain a method for producing hydraulic alumina that can shorten the curing time when mixed with water and cured, even in a relatively low temperature range. As a result, it was found that a specific hardening accelerator was added and present in a specific manufacturing process of hydraulic alumina, and in the case of further processing, a hydraulic alumina satisfying the above-mentioned problems was obtained. Reached.
【０００５】[0005]
【課題を解決するための手段】すなわち本発明は、ギブ
サイトを瞬間仮焼し、次いで粉砕して、少なくとも部分
的に再水和性を有する遷移アルミナよりなる水硬性アル
ミナを製造する方法に於いて、前記粉砕前のギブサイト
または遷移アルミナ１００重量部（Ａｌ2 Ｏ3に換算し
て）に対してリチウム塩を０．０５〜５重量部（Ｌｉ2
Ｏに換算して）添加後、粉砕することを特徴とする、水
硬性アルミナの製造方法を提供するにある。That is, the present invention relates to a method for producing a hydraulic alumina comprising a transition alumina having at least partially rehydration properties by flash calcining gibbsite and then pulverizing it. And 0.05 to 5 parts by weight of a lithium salt (Li 2 O 3 ) based on 100 parts by weight (in terms of Al 2 O 3 ) of gibbsite or transition alumina before the pulverization.
It is an object of the present invention to provide a method for producing hydraulic alumina, characterized by pulverizing after addition (in terms of O).
【０００６】[0006]
【発明の実施の形態】以下、本発明方法を詳細に説明す
る。本発明において再水和性アルミナとは、１００℃以
下で水と接触させると硬化性を呈するアルミナであり、
より具体的にはＸ線回折によりρアルミナおよびχアル
ミナを総量で少なくとも５０％含有し、残部が他の遷移
アルミナあるいは無定形アルミナ等を含有した混合物の
パターンを示すアルミナを言う。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention will be described below in detail. In the present invention, the rehydratable alumina is alumina which exhibits curability when brought into contact with water at 100 ° C. or lower,
More specifically, it refers to alumina which shows a pattern of a mixture containing, by X-ray diffraction, at least 50% of ρ-alumina and 総 -alumina in total, with the balance containing other transition alumina or amorphous alumina.
【０００７】このような再水和性アルミナは、代表的に
はバイヤー法で得られるギブサイトを瞬間仮焼して得ら
れる。通常、原料としてのギブサイトは価格と入手の容
易性より中心粒径が約４０〜約１００μｍのものが使用
される。ギブサイトの純度については異物を含まないも
のであれば特に制限はない。通常、Ｎａ2 Ｏ含有量は
０．０２〜１重量％程度である。ギブサイトの瞬間仮焼
は公知の装置で行われる。公知条件では、瞬間仮焼は、
通常、接触する熱ガス温度約４００℃〜１２００℃、線
速度約５ｍ／秒〜約５０ｍ／秒の気流中に同伴させて、
接触時間約０．１秒〜約１０秒の条件で焼成することに
より実施される。仮焼管出口を通過したアルミナは、通
常サイクロン、バグフィルター、電気集塵機等公知の方
法で気流より分離、回収し、再水和性アルミナを得る。
通常、得られた再水和性アルミナは、その水硬性効果を
より発揮し易くするために、粉砕処理を行う。[0007] Such rehydratable alumina is typically obtained by flash calcining gibbsite obtained by the Bayer method. Usually, gibbsite as a raw material has a central particle size of about 40 to about 100 μm from the viewpoint of cost and availability. There is no particular limitation on the purity of gibbsite as long as it does not contain any foreign matter. Usually, the Na 2 O content is about 0.02 to 1% by weight. Instant calcination of gibbsite is performed by a known apparatus. Under known conditions, instantaneous calcination is
Usually, the gas is brought into contact with a hot gas temperature of about 400 ° C. to 1200 ° C. and a linear velocity of about 5 m / sec to about 50 m / sec.
It is carried out by firing under the condition of a contact time of about 0.1 second to about 10 seconds. Alumina that has passed through the calcining tube outlet is separated and recovered from the gas stream by a known method such as a cyclone, a bag filter, or an electric dust collector to obtain a rehydratable alumina.
Usually, the obtained rehydratable alumina is subjected to a pulverizing treatment in order to more easily exert its hydraulic effect.
【０００８】本発明の実施に際しては、該粉砕処理前の
ギブサイト或いは遷移アルミナにリチウム塩を添加して
おくことを必須とする。リチウム塩としては、特に制限
されるものではないが、得られた水硬性アルミナを耐火
組成物の成形用バインダーとして用いた場合、焼成時に
腐食性あるいは環境に悪影響を与えないものが望まし
い。具体的な例としては、炭酸塩、酸化物、水酸化物、
アルミン酸塩等が使用できる。添加量はギブサイト或い
は遷移アルミナ１００重量部（Ａｌ2 Ｏ3 に換算）に対
し、リチウム塩（Ｌｉ2 Ｏに換算）を約０．０５〜約５
重量部、より好ましくは約０．５〜約４重量部の範囲で
使用される。リチウム塩の添加量が上記範囲未満の場合
には硬化時間の短縮効果が少なく、他方これより多いと
耐火組成物の焼成後の物性に望ましくない影響を与える
場合がある。In practicing the present invention, it is essential that a lithium salt is added to gibbsite or transition alumina before the pulverizing treatment. The lithium salt is not particularly limited. However, when the obtained hydraulic alumina is used as a binder for forming a refractory composition, a lithium salt that does not adversely affect corrosiveness or the environment during firing is desirable. Specific examples include carbonates, oxides, hydroxides,
Aluminates and the like can be used. To amount added gibbsite or transition alumina 100 parts by weight (converted to Al 2 O 3), from about 0.05 to about lithium salt (converted to Li 2 O) 5
Parts by weight, more preferably in the range of about 0.5 to about 4 parts by weight. If the amount of the lithium salt is less than the above range, the effect of shortening the curing time is small, while if it is more than this, the physical properties of the refractory composition after firing may be undesirably affected.
【０００９】リチウム塩の添加は、水硬性アルミナの製
造工程のうち、粉砕工程の前であればいずれの工程であ
ってもよく、たとえばバイヤー工程等ではアルミン酸ソ
ーダ溶液からのギブサイト析出時やギブサイト濾過時に
添加する、或いは瞬間仮焼前の市販のギブサイトに添加
混合する、さらには瞬間仮焼後に得られた遷移アルミナ
に添加する等の方法が可能であるが，作業の容易性や効
果発現の点から瞬間仮焼後に添加する方法が推奨され
る。The addition of the lithium salt may be carried out in any of the steps of producing hydraulic alumina before the pulverizing step. For example, in the buyer step or the like, gibbsite may be precipitated from a sodium aluminate solution or may be added. It is possible to add it at the time of filtration, add it to commercial gibbsite before flash calcining, and add it to the transition alumina obtained after flash calcining. From the point of view, the method of adding after instantaneous calcination is recommended.
【００１０】リチウム塩を添加したギブサイト或いは瞬
間仮焼後の遷移アルミナは次いで粉砕処理を行う。粉砕
はボールミル、振動ミル等、公知の装置を用いればよ
い。粉砕はアルミナの中心粒径が約１〜２０μｍ、好ま
しくは約１〜約１５μｍになるまで実施すればよい。中
心粒径が２０μｍを越える場合には、成形加工中に粒子
沈降を生じ、ハンドリングが困難であるばかりでなく、
成形体のバインダーとして十分な強度を発揮し得ない場
合がある。他方、中心粒径が上記未満の場合は、嵩密度
が低いためこれを含む耐火組成物の必要水混合量が大き
くなる。The gibbsite to which the lithium salt has been added or the transition alumina after flash calcination is then subjected to a pulverizing treatment. A known apparatus such as a ball mill and a vibration mill may be used for the pulverization. The pulverization may be performed until the center particle size of alumina becomes about 1 to 20 μm, preferably about 1 to about 15 μm. When the center particle diameter exceeds 20 μm, particle sedimentation occurs during molding, and not only is handling difficult, but also
In some cases, it may not be possible to exhibit sufficient strength as a binder for a molded article. On the other hand, when the center particle size is less than the above, the required water mixing amount of the refractory composition containing the bulk density increases because the bulk density is low.
【００１１】以上の方法により得られた本発明の水硬性
アルミナは、それ自身単独で、あるいは他の骨材成分と
混合し耐火組成物となし、これに水を混合して硬化せし
むる時、従来の水硬性アルミナに比較して硬化時間を短
くできることが特長である。ここで硬化時間とは、たと
えば水と混合後流し込み成形する場合、水硬性アルミナ
単独あるいは水硬性アルミナをバインダーとする耐火組
成物を流し込んだ後、脱枠が可能になる時間を示してい
る。通常の耐火組成物を流し込み成形する場合、硬化時
間は数時間〜数十時間であり、施工が冬季室外等の低温
域で行う場合には、通常の水硬性アルミナはこの時間の
上限になってしまい、著しく施工の能率が落ち、極端な
場合には硬化に至らないことがあるが、本発明方法によ
りえらた水硬性アルミナの硬化時間は雰囲気温度、適用
する量、骨材添加の有無にもよるが、通常１０分〜２４
時間である。The hydraulic alumina of the present invention obtained by the above method is used alone or in combination with other aggregate components to form a refractory composition, which is mixed with water to be cured. The feature is that the curing time can be shortened as compared with conventional hydraulic alumina. Here, for example, in the case of casting after mixing with water, the curing time refers to a time during which demolding becomes possible after casting a refractory composition using hydraulic alumina alone or hydraulic alumina as a binder. When casting a normal refractory composition, the curing time is several hours to several tens of hours, and when the construction is performed in a low temperature region such as outdoors in winter, the normal hydraulic alumina becomes the upper limit of this time. That is, the efficiency of construction is significantly reduced, and in extreme cases, curing may not be achieved.However, the curing time of the hydraulic alumina obtained by the method of the present invention depends on the ambient temperature, the amount to be applied, the presence or absence of the addition of aggregate. Normally 10 minutes to 24 hours
Time.
【００１２】本発明方法で得た少なくとも部分的に再水
和可能なアルミナよりなる水硬性アルミナの上記以外の
物性は、灼熱原料が４〜１５％、ＢＥＴ比表面積が１０
０〜３００ｍ2 ／ｇ、窒素吸着法細孔容積は０．１〜
０．３ｃｍ3 ／ｇ、嵩密度は重装時に０．８〜１．３ｇ
／ｃｍ3 である。The other physical properties of the hydraulic alumina obtained by the method of the present invention comprising at least partially rehydratable alumina are as follows: 4-15% of the raw material for burning, and 10% for the BET specific surface area.
0 to 300 m 2 / g, nitrogen adsorption method pore volume is 0.1 to
0.3 cm 3 / g, bulk density is 0.8-1.3 g when heavy
/ Cm 3 .
【００１３】本発明の水硬性アルミナは単独でアルミナ
成形体原料やコーティング原料とすることもできる。ま
た、公知の骨材成分と混合し、耐火物、触媒担体、各種
薬品の担体、吸着剤、無機膜、吸着ボード、断熱材その
他の成形体のバインダーとして利用できる。このように
骨材成分と混合されたものを、本発明では耐火組成物等
と称する場合がある。本発明の水硬性アルミナが適用で
きる骨材の例としては、α−アルミナ、再水和性を有し
ない遷移アルミナ、ムライト、シリカ、珪藻土、シリカ
とアルミナが共存する混合物、ガラスまたは複合酸化
物、天然ゼオライト、合成ゼオライト、シャモット，水
酸化アルミニウム、粘土、タルク、ベントナイト、ゼオ
ライト、コージェライト、チタニア、ジルコンサンド、
ジルコニア、炭化珪素、クロミア、マグネシア等があ
り、また骨材の形状としては、粉状、塊状、発泡体、繊
維状等が利用できる。耐火組成物等として使用される場
合、骨材成分のほか、成形性あるいは多孔性を改良する
目的の有機物を添加することもできる。耐火組成物等中
に占める水硬性アルミナは通常１重量％以上、好ましく
は３重量％以上の範囲で使用される。The hydraulic alumina of the present invention can be used alone as a raw material for an alumina compact or a raw material for coating. Further, it can be mixed with a known aggregate component and used as a refractory, a catalyst carrier, a carrier for various chemicals, an adsorbent, an inorganic film, an adsorption board, a heat insulating material, and a binder for other molded articles. In the present invention, such a mixture with the aggregate component is sometimes referred to as a refractory composition or the like. Examples of aggregates to which the hydraulic alumina of the present invention can be applied include α-alumina, transition alumina having no rehydration property, mullite, silica, diatomaceous earth, a mixture in which silica and alumina coexist, glass or a composite oxide, Natural zeolite, synthetic zeolite, chamotte, aluminum hydroxide, clay, talc, bentonite, zeolite, cordierite, titania, zircon sand,
There are zirconia, silicon carbide, chromia, magnesia, and the like, and as the shape of the aggregate, powder, lump, foam, fiber, and the like can be used. When used as a refractory composition or the like, an organic substance for the purpose of improving moldability or porosity can be added in addition to the aggregate component. The hydraulic alumina occupying in the refractory composition or the like is usually used in a range of 1% by weight or more, preferably 3% by weight or more.
【００１４】本発明の水硬性アルミナを耐火組成物等と
なしたものは、水と混合し公知の方法で成形できる。水
硬性アルミナがその効果を発揮するためには、水の存在
が不可欠である。水の量は、混合する他の成分等により
異なるが、水硬性アルミナ１００重量部あたり約２０〜
２００重量部が必要である。本発明の水硬性アルミナ
は、比較的低温度雰囲気でも早硬性を発揮する冬季使用
にも適したものであり、水温および気温が約５℃以上
で、成形中の水の蒸発が実質上無視できる温度以下で使
用可能である。硬化速度あるいは硬化後の強度を制御す
る目的で成形体を水が実質的に蒸発しないような条件で
加熱あるいは冷却することも可能である。The refractory composition of the hydraulic alumina of the present invention can be mixed with water and molded by a known method. In order for hydraulic alumina to exert its effect, the presence of water is indispensable. Although the amount of water varies depending on other components to be mixed, it is about 20 to 100 parts by weight of hydraulic alumina.
200 parts by weight are required. The hydraulic alumina of the present invention is also suitable for use in winter, exhibiting fast-setting even in a relatively low temperature atmosphere, and has a water temperature and an air temperature of about 5 ° C. or more, and the evaporation of water during molding can be substantially ignored. Can be used below the temperature. For the purpose of controlling the curing speed or the strength after curing, it is also possible to heat or cool the molded body under conditions such that water does not substantially evaporate.
【００１５】本発明の水硬性アルミナは、このような広
い利用が考えられるが、いずれの場合においても熟成が
必要である。熟成は成形後の成形体を、水が存在する条
件で静置することにより達成される。水が特に蒸発しや
すい条件においては、シートをかぶせる等の処置が必要
である。熟成時間は、熟成温度により異なるが、約１分
〜１６８時間、普通には１時間〜７２時間である。この
時間内に水硬性アルミナは硬化し、成形体に強度を賦与
する。Although the hydraulic alumina of the present invention can be used in such a wide range, aging is required in any case. Aging is achieved by allowing the molded article after molding to stand under conditions where water is present. Under conditions where water evaporates particularly easily, it is necessary to take measures such as covering the sheet. The aging time varies depending on the aging temperature, but is about 1 minute to 168 hours, usually 1 hour to 72 hours. During this time, the hydraulic alumina hardens and imparts strength to the compact.
【００１６】[0016]
【発明の効果】以上詳述した本発明の方法によれば、硬
化時間が短い水硬性アルミナが、廉価に得られ、その産
業的効果は頗る大である。According to the method of the present invention described in detail above, hydraulic alumina having a short curing time can be obtained at low cost, and its industrial effect is extremely large.
【００１７】[0017]
【実施例】以下、本発明方法を実施例により、さらに詳
細に説明するが、本発明方法はかかる実施例により制限
されるものではない。なお、本文中において示した物性
値は次の測定法によった。 硬化時間；水硬性アルミナ１００ｇと純水１５０ｇを混
合し、ジャーに投入した後、ＪＩＳ−Ｒ５２０１による
針入度が１．３ｃｍになる時間を測定した（使用機器は
丸菱化学機械製作所製、１．５ｍｍ針、荷重２０８ｇで
ある）。 中心粒径；日機装マイクロトラックＭＫ−II型で測定し
た．EXAMPLES Hereinafter, the method of the present invention will be described in more detail with reference to examples, but the method of the present invention is not limited to these examples. In addition, the physical property values shown in the text were based on the following measurement methods. Curing time: 100 g of hydraulic alumina and 150 g of pure water were mixed and charged into a jar, and the time required for the penetration to 1.3 cm according to JIS-R5201 was measured (the equipment used was Marubishi Chemical Machine Works, 1 0.5 mm needle, load 208 g). Central particle size: measured with Nikkiso Microtrac Model MK-II.
【００１８】実施例１ バイヤー工程で得られた中心粒径４２μのギブサイトを
約７００℃の熱ガス気流中に投入し瞬間仮焼した。得ら
れた瞬間仮焼品の灼熱原料は６．２％であった。次いで
瞬間仮焼品２８５ｇと和光純薬製炭酸リチウム１５ｇ
（Ａｌ2 Ｏ3 １００重量部に対しＬｉ2 Ｏ換算で２．１
重量部）を混合後、ボールミルで２時間粉砕した。得ら
れた水硬性アルミナは結晶形が炭酸リチウム（Ｚａｂｕ
ｅｌｉｔｅ）を含有するχ，ρで表される再水和性アル
ミナであり、中心粒径が９．９μｍで、ＢＥＴ表面積が
２４７ｍ2 ／ｇであった。このアルミナの硬化時間は６
８分であった。Example 1 Gibbsite having a center particle size of 42 μm obtained in the Bayer process was charged into a hot gas stream at about 700 ° C. and calcined instantaneously. The burning raw material of the obtained instant calcined product was 6.2%. Next, 285 g of instant calcined product and 15 g of lithium carbonate made by Wako Pure Chemical
(2.1 parts by weight of Li 2 O based on 100 parts by weight of Al 2 O 3)
(Parts by weight), and pulverized with a ball mill for 2 hours. The crystal form of the obtained hydraulic alumina is lithium carbonate (Zabu).
and a rehydratable alumina represented by χ, ρ, containing 9.9 μm and having a BET surface area of 247 m 2 / g. The curing time of this alumina is 6
8 minutes.
【００１９】比較例１ 炭酸リチウムを添加すること以外は、実施例１と同じ操
作で水硬性アルミナを得た。得られた水硬性アルミナは
結晶形がχ，ρで表される再水和性アルミナであり、中
心粒径が９．５μｍでＢＥＴ表面積が２５５ｍ2 ／ｇで
あった。このアルミナの硬化時間は９４分であった。Comparative Example 1 A hydraulic alumina was obtained in the same manner as in Example 1 except that lithium carbonate was added. The obtained hydraulic alumina was a rehydratable alumina whose crystal form was represented by χ, ρ, had a central particle size of 9.5 μm, and a BET surface area of 255 m 2 / g. The curing time of this alumina was 94 minutes.
【００２０】比較例２ 比較例１の再水和性アルミナ９５ｇに和光純薬製炭酸リ
チウム５ｇ（Ａｌ2 Ｏ 3 １００重量部に対しＬｉ2 Ｏ換
算で２．１重量部）を添加・混合し水硬性アルミナを得
た。得られた製品の結晶形は炭酸リチウム（Ｚａｂｕｅ
ｌｉｔｅ）を含有するχ，ρで表される再水和性アルミ
ナであり、中心粒径が９．５μｍで、ＢＥＴ表面積が２
４１ｍ2 ／ｇであった。このアルミナの硬化時間は９２
分であった。Comparative Example 2 95 g of the rehydratable alumina of Comparative Example 1 was
5g (AlTwoO ThreeLi to 100 parts by weightTwoO exchange
2.1 parts by weight in total) and mixed to obtain hydraulic alumina
Was. The crystal form of the obtained product is lithium carbonate (Zabue).
rehydratable aluminum represented by χ and ρ
With a central particle size of 9.5 μm and a BET surface area of 2
41mTwo/ G. The curing time of this alumina was 92
Minutes.
Claims (3)
て、少なくとも部分的に再水和性を有する遷移アルミナ
よりなる水硬性アルミナを製造する方法に於いて、前記
粉砕前のギブサイトまたは遷移アルミナ１００重量部
（Ａｌ2 Ｏ3 に換算して）に対してリチウム塩を０．０
５〜５重量部（Ｌｉ2 Ｏに換算して）添加後、粉砕する
ことを特徴とする水硬性アルミナの製造方法。1. A method for producing a hydraulic alumina comprising a transition alumina having at least partially rehydratable properties, wherein said gibbsite or transition alumina is preliminarily calcined and then pulverized. 100 parts by weight (in terms of Al 2 O 3 ) of lithium salt in 0.0
5-5 parts by weight (in terms of Li 2 O) After the addition, the production method of hydraulic alumina, characterized by grinding.
の中心粒径が４０〜１００μｍであり、粉砕後のこれら
の中心粒径が１〜２０μであることを特徴とする請求項
１記載の水硬性アルミナの製造方法。2. The hydraulic alumina according to claim 1, wherein the central particle diameter of the gibbsite or transition alumina before pulverization is 40 to 100 μm, and the central particle diameter after pulverization is 1 to 20 μm. Manufacturing method.
いずれかで行うことを特徴とする請求項１または２記載
の水硬性アルミナの製造方法。3. The method for producing hydraulic alumina according to claim 1, wherein the pulverizing treatment is performed by using a ball mill or a vibration mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22249096A JP3341594B2 (en) | 1996-08-23 | 1996-08-23 | Method for producing hydraulic alumina |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22249096A JP3341594B2 (en) | 1996-08-23 | 1996-08-23 | Method for producing hydraulic alumina |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1067571A true JPH1067571A (en) | 1998-03-10 |
| JP3341594B2 JP3341594B2 (en) | 2002-11-05 |
Family
ID=16783252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22249096A Expired - Fee Related JP3341594B2 (en) | 1996-08-23 | 1996-08-23 | Method for producing hydraulic alumina |
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| Country | Link |
|---|---|
| JP (1) | JP3341594B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001302233A (en) * | 2000-04-27 | 2001-10-31 | Sumitomo Chem Co Ltd | Method for producing alumina powder |
| JP2003095711A (en) * | 2001-09-27 | 2003-04-03 | Sumitomo Osaka Cement Co Ltd | Unburned hardened cement, and production method |
| JP2006056989A (en) * | 2004-08-19 | 2006-03-02 | Mitsubishi Materials Corp | Hydraulic alumina, neutral solidification material for water-containing soil obtained by using the same, method for producing hydraulic alumina, method for preventing heavy metal from being eluted, and method of dehydration and solidification treatment of highly water-containing soil |
| JP2006297285A (en) * | 2005-04-20 | 2006-11-02 | Ube Ind Ltd | Low alkali hardner for water-containing soil and hardening treatment method |
| JP4690729B2 (en) * | 2005-01-14 | 2011-06-01 | 三菱マテリアル株式会社 | Hydraulic alumina composition for hydrous soil neutral solidifying material, method for producing the same, neutral solidifying material for hydrous soil, method for preventing heavy metal elution, and dehydration solidification method for highly hydrous soil |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200399488A1 (en) | 2018-02-28 | 2020-12-24 | Sumitomo Chemical Company, Limited | Particle composition |
-
1996
- 1996-08-23 JP JP22249096A patent/JP3341594B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001302233A (en) * | 2000-04-27 | 2001-10-31 | Sumitomo Chem Co Ltd | Method for producing alumina powder |
| JP2003095711A (en) * | 2001-09-27 | 2003-04-03 | Sumitomo Osaka Cement Co Ltd | Unburned hardened cement, and production method |
| JP2006056989A (en) * | 2004-08-19 | 2006-03-02 | Mitsubishi Materials Corp | Hydraulic alumina, neutral solidification material for water-containing soil obtained by using the same, method for producing hydraulic alumina, method for preventing heavy metal from being eluted, and method of dehydration and solidification treatment of highly water-containing soil |
| JP4680549B2 (en) * | 2004-08-19 | 2011-05-11 | 三菱マテリアル株式会社 | Hydraulic alumina composition for hydrous soil neutral solidifying material, method for producing the same, neutral solidifying material for hydrous soil, method for preventing heavy metal elution, and dehydration solidification method for highly hydrous soil |
| JP4690729B2 (en) * | 2005-01-14 | 2011-06-01 | 三菱マテリアル株式会社 | Hydraulic alumina composition for hydrous soil neutral solidifying material, method for producing the same, neutral solidifying material for hydrous soil, method for preventing heavy metal elution, and dehydration solidification method for highly hydrous soil |
| JP2006297285A (en) * | 2005-04-20 | 2006-11-02 | Ube Ind Ltd | Low alkali hardner for water-containing soil and hardening treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3341594B2 (en) | 2002-11-05 |
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