JP2003221227A - Method for producing boehmite - Google Patents
Method for producing boehmiteInfo
- Publication number
- JP2003221227A JP2003221227A JP2002019581A JP2002019581A JP2003221227A JP 2003221227 A JP2003221227 A JP 2003221227A JP 2002019581 A JP2002019581 A JP 2002019581A JP 2002019581 A JP2002019581 A JP 2002019581A JP 2003221227 A JP2003221227 A JP 2003221227A
- Authority
- JP
- Japan
- Prior art keywords
- boehmite
- aluminum hydroxide
- producing
- comparative example
- produced
- 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
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- 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、プラスチック、ゴ
ム等の難燃化フィラー、電子材料のフィラー、触媒担
体、製紙用塗工内填剤、塗料用顔料、高純度アルミナの
原料等に用いられるベーマイトの製造方法に関する。TECHNICAL FIELD The present invention is used for flame retardant fillers such as plastics and rubbers, fillers for electronic materials, catalyst carriers, coating fillers for papermaking, pigments for paints, raw materials for high purity alumina, etc. The present invention relates to a method for manufacturing boehmite.
【０００２】[0002]
【従来の技術】従来より、ベーマイトの製造方法は種々
提供されているが、一般的には原料の水酸化アルミニウ
ムを水熱処理することにより行われている。この製造方
法は、水酸化アルミニウムと反応促進剤（金属化合物）
に水を加えたスラリーの撹拌混合工程、圧力容器により
水蒸気雰囲気下で加熱しながら湿式養生する水熱処理工
程、反応生成物の脱水工程、水洗工程、濾過工程、乾燥
工程の各工程から成り立っている（例えば、特開平６−
２６３４３７号公報、特開２０００−８６２３５号公報
参照）。2. Description of the Related Art Conventionally, various methods for producing boehmite have been provided, but generally, it is carried out by hydrothermally treating aluminum hydroxide as a raw material. This manufacturing method uses aluminum hydroxide and a reaction accelerator (metal compound).
It consists of a stirring and mixing process of slurry with water added, a hydrothermal treatment process of wet curing while heating in a steam atmosphere with a pressure vessel, a dehydration process of reaction products, a washing process, a filtration process, and a drying process. (For example, JP-A-6-
263437, Japanese Patent Laid-Open No. 2000-86235).
【０００３】従来の水熱処理によるベーマイトの製造方
法によれば、水酸化アルミニウムに反応促進剤としてア
ルカリ土類金属やアルカリ金属の水酸化物、酸化物、塩
化物、硫酸塩等を加えるため、水洗工程が不可欠で、こ
の水洗工程を経ても反応促進剤に由来するＮａやＣａ等
の不純物がなおも残存し易く、高純度のベーマイトを製
造し難いということがあった。水酸化アルミニウムに水
を加えたスラリーを水熱処理するため、１バッチ当たり
の仕込量が制約され、また、水洗工程の他、脱水工程、
濾過工程が不可欠で工程が煩雑であるという課題があっ
た。また、高収率でベーマイトを得るには長時間養生し
なければならず、生産効率を高めるために短時間で養生
できる製造方法が望まれていた。According to the conventional method for producing boehmite by hydrothermal treatment, since hydroxides, oxides, chlorides, sulfates and the like of alkaline earth metals and alkali metals are added to aluminum hydroxide as reaction accelerators, it is washed with water. Since the process is indispensable, impurities such as Na and Ca derived from the reaction accelerator are still liable to remain even after the water washing process, and it is difficult to produce high-purity boehmite. Since the slurry obtained by adding water to aluminum hydroxide is subjected to hydrothermal treatment, the amount charged per batch is restricted, and in addition to the washing step, the dehydration step,
There is a problem that the filtration process is indispensable and the process is complicated. Further, in order to obtain boehmite at a high yield, it has to be aged for a long time, and a production method that can be aged in a short time has been desired in order to improve production efficiency.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記従来の
ベーマイトの製造方法に鑑みなされたものであり、製造
時間が短く少ない工程数で低コストに高純度のベーマイ
トを効率的に製造できる方法に関する。SUMMARY OF THE INVENTION The present invention has been made in view of the above conventional method for producing boehmite, and is a method for efficiently producing high-purity boehmite at low cost with a short production time and a small number of steps. Regarding
【０００５】[0005]
【課題を解決するための手段】上記課題を解決する本発
明のベーマイトの製造方法は、水酸化アルミニウム粉を
圧力容器を用いて水蒸気雰囲気下、加熱しながら乾式養
生することを要旨とする。ここで、乾式養生とは、出発
原料の水酸化アルミニウムに水を加えることなく粉状の
ままで養生することを意味する。また、本明細書中で用
いる湿式養生とは、乾式養生の対語で、水酸化アルミニ
ウムに水を加えスラリー状（液状）にして養生すること
を意味する。また、上記発明において、板状のベーマイ
トを製造できる。更に、上記のいずれかの発明におい
て、乾式養生は、１４０〜３００℃で加熱しながら行う
ことができる。The method for producing boehmite according to the present invention for solving the above-mentioned problems is characterized in that aluminum hydroxide powder is dry-cured while being heated in a steam atmosphere using a pressure vessel. Here, the dry curing means that the starting aluminum hydroxide is cured in a powder state without adding water. Further, the wet curing used in the present specification is the opposite of dry curing and means curing by adding water to aluminum hydroxide to form a slurry (liquid state). Further, in the above invention, plate-shaped boehmite can be produced. Further, in any of the above inventions, the dry curing can be performed while heating at 140 to 300 ° C.
【０００６】[0006]
【発明の実施の形態】以下、本発明の実施形態について
説明する。出発原料の水酸化アルミニウムは、粉状のも
のを用いる。なお、粉状とは、スラリー状で市販される
水酸化アルミニウムを乾燥させて粉状にしたものも含
む。製造されるベーマイトの粒径は、水酸化アルミニウ
ムの粒径との依存性があるので、必要とするベーマイト
の粒径に対応させて種々の粒径の水酸化アルミニウムを
選択して用いることができる。水酸化アルミニウムの粒
度調整は、ボールミル等で粉砕して行っても良い。ま
た、用途に応じて、ＮａやＣａ等の不純物の少ない高純
度の水酸化アルミニウムを用いることもできる。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. Powdered aluminum hydroxide is used as a starting material. In addition, the powdery form also includes a product obtained by drying aluminum hydroxide, which is commercially available in the form of a slurry, into a powdery form. Since the particle size of boehmite produced depends on the particle size of aluminum hydroxide, aluminum hydroxide having various particle sizes can be selected and used in accordance with the required particle size of boehmite. . The particle size of aluminum hydroxide may be adjusted by crushing with a ball mill or the like. In addition, high-purity aluminum hydroxide containing few impurities such as Na and Ca can be used depending on the application.
【０００７】上記の水酸化アルミニウム粉を容器に充填
し、オートクレーブなどの圧力容器内で水蒸気雰囲気
下、加熱しながら乾式養生する。加熱温度は、１４０〜
３００℃が好ましく、１４５〜２５０℃がより好まし
く、１５０〜１８０℃が最も好ましい。加熱温度が、１
４０℃より低いとベーマイトを十分に得られないからで
あり、３００℃より高いとコスト面で好ましくないから
である。The above aluminum hydroxide powder is filled in a container, and dry curing is carried out in a pressure container such as an autoclave under a steam atmosphere while heating. The heating temperature is 140 ~
300 degreeC is preferable, 145-250 degreeC is more preferable, 150-180 degreeC is the most preferable. Heating temperature is 1
This is because if the temperature is lower than 40 ° C, boehmite cannot be sufficiently obtained, and if the temperature is higher than 300 ° C, it is not preferable in terms of cost.
【０００８】上記の乾式養生終了後、オートクレーブを
放冷した後、乾燥させることによりベーマイトを得る。
なお、本発明の製造方法によるベーマイトは、水分含有
量が少ないため、ベーマイトの用途に応じて乾燥を省略
しても良い。After completion of the above dry curing, the autoclave is allowed to cool and then dried to obtain boehmite.
Since the boehmite produced by the production method of the present invention has a low water content, the drying may be omitted depending on the application of the boehmite.
【０００９】以上説明した本発明のベーマイトの製造方
法によれば、水を加えて水酸化アルミニウムをスラリー
状にする必要がなく、粉状のままで製造に供することが
できるため、１バッチ当たりの仕込量を増量させること
ができ、ひいては生産性の向上に資することができる。
また、水への加熱エネルギーが不要のため、エネルギー
コストを低減させることも可能となる。更に、スラリー
状の水酸化アルミニウムを水熱処理しないことにより、
脱水、水洗、濾過の各工程が不要で、簡易な工程でベー
マイトを製造できるばかりか、廃水処理の付帯施設も不
要となり、この点でも製造コストを低減化できる。ま
た、スラリー状の水酸化アルミニウムを用いて水熱処理
する場合に比し、本発明で得られるベーマイトは付着す
る水分が少なく、乾燥工程を短時間で仕上げることがで
き、効率的にベーマイトを製造できる。According to the method for producing boehmite of the present invention described above, it is not necessary to add water to make aluminum hydroxide into a slurry form, and the product can be used in the form of powder as it is, so that it can be produced per batch. The charged amount can be increased, which in turn can contribute to the improvement of productivity.
Moreover, since heating energy for water is unnecessary, it is possible to reduce energy cost. Furthermore, by not hydrothermally treating slurry aluminum hydroxide,
Since each process of dehydration, washing with water, and filtration is not required, boehmite can be produced by a simple process, and an additional facility for wastewater treatment is not required, which also reduces the production cost. Further, compared with the case where hydrothermal treatment is performed using slurry aluminum hydroxide, the boehmite obtained in the present invention has less attached water, the drying step can be completed in a short time, and the boehmite can be efficiently produced. .
【００１０】また、反応促進剤が不要で出発原料の水酸
化アルミニウム粉のみで足りるため、反応促進剤に由来
するＮａやＣａ等の不純物が残存することがなく、高純
度のベーマイトを得ることができる。更に、反応促進剤
が不要なことから製造コストを低減化させることもでき
る。Further, since a reaction accelerator is not required and only aluminum hydroxide powder as a starting material is sufficient, impurities such as Na and Ca derived from the reaction accelerator do not remain, and high-purity boehmite can be obtained. it can. Further, since a reaction accelerator is not necessary, it is possible to reduce the manufacturing cost.
【００１１】また、本発明のベーマイトの製造方法によ
れば、短時間でベーマイトを製造することができる。本
発明のベーマイトの製造方法は、板状ベーマイトの製造
に好適であるが、製造条件を検討することにより針状な
ど他の形態のベーマイトの製造も可能である。According to the boehmite production method of the present invention, boehmite can be produced in a short time. The method for producing boehmite of the present invention is suitable for producing plate-like boehmite, but it is also possible to produce other forms of boehmite such as needles by examining the production conditions.
【００１２】[0012]
【実施例】次いで、本発明を実施例を挙げて詳細に説明
するが、本発明は以下の実施例に限定されるものではな
い。EXAMPLES Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples.
【００１３】所定時間養生後得られるベーマイトの収率
（％）と養生（反応）時間との関係、粒径及びアスペク
ト比を各々実施例と比較例について調べた。実施例１〜
実施例５は、表１〜表４に示すように各々粒径が異なる
水酸化アルミニウム粉１ｋｇを容器に充填し、オートク
レーブを用いて飽和状態の水蒸気雰囲気下、所定温度で
所定時間加熱しながら乾式養生した。養生後、オートク
レーブを自然放冷し、１３０℃で乾燥させて板状ベーマ
イトが得られた。The relationship between the yield (%) of boehmite obtained after aging for a predetermined time and the aging (reaction) time, the particle size and the aspect ratio were examined for each Example and Comparative Example. Example 1
In Example 5, as shown in Tables 1 to 4, 1 kg of aluminum hydroxide powders each having a different particle size was filled in a container, and a dry type while heating at a predetermined temperature for a predetermined time in a saturated steam atmosphere using an autoclave. I was cured. After curing, the autoclave was naturally cooled and dried at 130 ° C to obtain a plate-shaped boehmite.
【００１４】比較例１〜比較例６は、表１〜表４に示す
ように各々粒径の異なる水酸化アルミニウム粉１ｋｇと
所定量の水を容器に入れ、十分に撹拌混合してスラリー
とし、これをオートクレーブを用いて水蒸気雰囲気下、
所定温度で所定時間加熱しながら湿式養生した。養生
後、脱水、水洗、濾過、乾燥の各工程を経て板状ベーマ
イトが得られた。なお、比較例３〜比較例５について
は、反応促進剤を添加した（比較例３と比較例４：Ｎａ
ＯＨ、８５．５ｇ（対Ａｌ（ＯＨ）３１６．７モル％、
比較例５：ＣａＡｃ２、２５１．０ｇ（対Ａｌ（ＯＨ）
３１１．１モル％））。また、水酸化アルミニウムに加
えた水の量は、比較例１、比較例３及び比較例６では各
々５ｋｇ、比較例２では１０ｋｇ、比較例４と比較例５
では各々３ｋｇであった。表２中、ＣａＡｃ２は、酢酸
カルシウム・一水和物である。In Comparative Examples 1 to 6, as shown in Tables 1 to 4, 1 kg of aluminum hydroxide powder having different particle diameters and a predetermined amount of water were placed in a container and sufficiently stirred and mixed to form a slurry. Using an autoclave in a steam atmosphere,
Wet curing was performed while heating at a predetermined temperature for a predetermined time. After curing, plate boehmite was obtained through the steps of dehydration, washing with water, filtration and drying. In addition, about Comparative Example 3-5, the reaction accelerator was added (Comparative Example 3 and Comparative Example 4: Na.
OH, 85.5 g (versus Al (OH) 3 16.7 mol%,
Comparative Example 5: CaAc 2 , 251.0 g (vs. Al (OH))
3 11.1 mol%)). The amount of water added to aluminum hydroxide was 5 kg in each of Comparative Example 1, Comparative Example 3, and Comparative Example 6, 10 kg in Comparative Example 2, and Comparative Example 4 and Comparative Example 5.
Then, it was 3 kg each. In Table 2, CaAc 2 is calcium acetate monohydrate.
【００１５】結果は、表１〜表４に示した。実施例１
は、乾式養生後１時間で収率が１００％に達したが、比
較例１と比較例２は長時間を要した（表１参照）。ま
た、比較例３は、５時間でほぼ１００％の収率であっ
た。実施例１に比べ水酸化アルミニウムの粒径が大きい
実施例２は、３時間で収率１００％に達し、反応促進剤
が添加された比較例４及び比較例５より短時間で製造で
きた（表２参照）。粒径が実施例１と同様で加熱温度を
１５０℃で乾式養生した実施例３は、５時間で収率１０
０％に達したが、同じ条件で湿式養生した比較例６は、
６時間でも３９％に過ぎなかった（表３参照）。また、
実施例５と実施例６から、水酸化アルミニウムの粒径が
大きい場合も本発明の製造方法が適用でき、大きな粒径
の板状ベーマイトを短時間で製造できることが判明し
た。The results are shown in Tables 1 to 4. Example 1
The yield reached 100% in 1 hour after dry curing, but it took a long time in Comparative Example 1 and Comparative Example 2 (see Table 1). In Comparative Example 3, the yield was almost 100% in 5 hours. In Example 2 in which the particle size of aluminum hydroxide was larger than that in Example 1, the yield reached 100% in 3 hours and could be produced in a shorter time than in Comparative Examples 4 and 5 to which the reaction accelerator was added ( See Table 2). In Example 3 in which the particle size was the same as in Example 1 and the heating temperature was 150 ° C. for dry curing, the yield was 10 in 5 hours.
Comparative Example 6, which reached 0%, was wet-cured under the same conditions.
Even 6 hours was only 39% (see Table 3). Also,
From Example 5 and Example 6, it was found that the manufacturing method of the present invention can be applied even when the particle size of aluminum hydroxide is large, and plate boehmite having a large particle size can be manufactured in a short time.
【００１６】反応促進剤を添加した比較例３〜比較例５
では、水洗工程を繰り返しても、板状ベーマイトに含ま
れるＮａは０．１ｗｔ％（Ｎａ２Ｏ換算の実測代表値、
比較例３及び比較例４参照）、Ｃａは０．５ｗｔ％（Ｃ
ａＯ換算の実測代表値、比較例５参照）であり、反応促
進剤に由来するＮａやＣａを十分に除去することができ
なかった。一方、実施例では、板状ベーマイトに反応促
進剤に由来するＮａやＣａが含まれることがないので、
例えば、Ｎａが０．００２ｗｔ％（Ｎａ２Ｏ換算）の純
度の高い水酸化アルミニウムを出発原料として用いた場
合、極めて高純度の板状ベーマイトを容易に得ることが
できる。Comparative Examples 3 to 5 to which a reaction accelerator was added
Then, even if the washing step is repeated, Na contained in the plate boehmite is 0.1 wt% (measured representative value in terms of Na 2 O,
Comparative Example 3 and Comparative Example 4), Ca is 0.5 wt% (C
It is a measured representative value in terms of aO, see Comparative Example 5), and Na and Ca derived from the reaction accelerator could not be sufficiently removed. On the other hand, in Examples, since the plate-shaped boehmite does not contain Na or Ca derived from the reaction accelerator,
For example, when high-purity aluminum hydroxide having a Na content of 0.002 wt% (as Na 2 O) is used as a starting material, extremely high-purity plate boehmite can be easily obtained.
【００１７】表１〜表４から明らかなように、本発明の
製造方法により得られた板状ベーマイトの粒径は、出発
原料の水酸化アルミニウムの粒径に良く対応し、所望の
粒径の板状ベーマイトを容易に製造できる。As is clear from Tables 1 to 4, the particle size of the plate-shaped boehmite obtained by the production method of the present invention corresponds well to the particle size of aluminum hydroxide as a starting material and has a desired particle size. Plate boehmite can be easily manufactured.
【００１８】また、反応促進剤を加えることなく乾式養
生した実施例と湿式養生した比較例を比べると、実施例
の方が相対的にアスペクト比の大きな板状ベーマイトが
得られた（実施例１と比較例１、比較例２、実施例３と
比較例６を各々参照）。このことより、本発明の板状ベ
ーマイトの製造方法によれば、反応促進剤を添加するこ
となく、アスペクト比の大きな高純度の板状ベーマイト
の製造が可能となる。なお、アスペクト比は、板状ベー
マイトの長径と厚みの比である。Further, comparing the dry-cured example without adding the reaction accelerator and the wet-cured comparative example, a plate-shaped boehmite having a relatively large aspect ratio was obtained in the example (Example 1). And Comparative Example 1, Comparative Example 2, Example 3 and Comparative Example 6). From this, according to the method for producing plate-like boehmite of the present invention, it is possible to produce high-purity plate-like boehmite having a large aspect ratio without adding a reaction accelerator. The aspect ratio is the ratio of the major axis and the thickness of the plate boehmite.
【００１９】なお、板状ベーマイトの同定は、Ｘ線回析
により行った。また、図１から図３は、各々実施例１〜
実施例３の電顕写真像を示し、図４と図５は各々比較例
１と比較例５の電顕写真像を示すが、いずれも板状のベ
ーマイトが観察された。板状ベーマイトの収率は、Ｘ線
回析と熱重量分析（ＴＧ）により導出した。The plate boehmite was identified by X-ray diffraction. In addition, FIGS.
The electron micrograph images of Example 3 are shown, and FIGS. 4 and 5 show the electron micrograph images of Comparative Example 1 and Comparative Example 5, respectively, in which plate-shaped boehmite was observed. The yield of plate boehmite was derived by X-ray diffraction and thermogravimetric analysis (TG).
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【表２】 [Table 2]
【００２２】[0022]
【表３】 [Table 3]
【００２３】[0023]
【表４】 [Table 4]
【００２４】[0024]
【発明の効果】本発明は、上記のように構成されるた
め、以下の効果を奏する。本発明によれば、水酸化アル
ミニウムに水を加えることなく粉末のままで製造に供す
ることができるため、１バッチ当たりの仕込量を増量さ
せることができ、ひいては生産性の向上に資するベーマ
イトの製造方法を提供できる。また、水への加熱エネル
ギーが不要なことによるエネルギーコストの低減、廃水
処理の付帯施設の不要なことによる製造コストの低減が
可能で、安価なベーマイトの製造方法を提供できる。脱
水、水洗、濾過の各工程が不要で、簡易な工程で効率的
なベーマイトの製造方法を提供できる。更に、得られる
ベーマイトに付着する水分が少ないので、乾燥工程を短
時間で仕上げることもでき、効率的なベーマイトの製造
が可能となる。Since the present invention is configured as described above, it has the following effects. According to the present invention, aluminum hydroxide can be used as a powder as it is without adding water to the production, so that the amount of charge per batch can be increased, and thus the production of boehmite that contributes to the improvement of productivity. A method can be provided. Further, it is possible to reduce the energy cost by not requiring heating energy for water and the manufacturing cost by not requiring an auxiliary facility for wastewater treatment, and it is possible to provide an inexpensive method for producing boehmite. It is possible to provide an efficient method for producing boehmite with simple steps, since each step of dehydration, washing with water, and filtration is unnecessary. Further, since the amount of water attached to the obtained boehmite is small, the drying step can be completed in a short time, and the boehmite can be efficiently produced.
【００２５】また、本発明によれば、反応促進剤は不要
で出発原料の水酸化アルミニウム粉のみで足りるため、
反応促進剤に由来するＮａやＣａ等の不純物が残存する
ことがなく、高純度のベーマイトを製造できる。また、
反応促進剤が不要なため製造コストを低減化させること
もできる。Further, according to the present invention, since the reaction accelerator is not necessary and only the aluminum hydroxide powder as the starting material is sufficient,
High-purity boehmite can be produced without leaving impurities such as Na and Ca derived from the reaction accelerator. Also,
Since a reaction accelerator is unnecessary, it is possible to reduce the manufacturing cost.
【００２６】また、本発明によれば、短時間でベーマイ
トの製造ができるので、生産性に優れた安価なベーマイ
トの製造方法を提供できる。Further, according to the present invention, since boehmite can be produced in a short time, it is possible to provide an inexpensive method for producing boehmite which is excellent in productivity.
【００２７】上記より、本発明の製造方法により製造さ
れるベーマイトは、プラスチック、ゴム等の難燃化フィ
ラー、触媒担体、製紙用塗工内填剤、塗料用顔料等に用
いることができることは勿論のこと、高純度のベーマイ
トが得られることより電子材料のフィラー、絶縁材、高
純度アルミナの原料等に用いることもできる。From the above, it goes without saying that the boehmite produced by the production method of the present invention can be used as a flame-retardant filler such as plastic or rubber, a catalyst carrier, an internal filler for papermaking coatings, a pigment for coatings and the like. Therefore, since high-purity boehmite can be obtained, it can be used as a filler of an electronic material, an insulating material, a raw material of high-purity alumina, and the like.
【図１】実施例１により製造された板状ベーマイトの電
顕写真像を示す。FIG. 1 shows an electron micrograph image of the plate-shaped boehmite produced in Example 1.
【図２】実施例２により製造された板状ベーマイトの電
顕写真像を示す。FIG. 2 shows an electron micrograph image of the plate-shaped boehmite produced in Example 2.
【図３】実施例３により製造された板状ベーマイトの電
顕写真像を示す。FIG. 3 shows an electron micrograph image of a plate-shaped boehmite produced in Example 3.
【図４】比較例１により製造された板状ベーマイトの電
顕写真像を示す。FIG. 4 shows an electron micrograph image of the plate-shaped boehmite produced in Comparative Example 1.
【図５】比較例５により製造された板状ベーマイトの電
顕写真像を示す。FIG. 5 shows an electron micrograph image of the plate-shaped boehmite produced in Comparative Example 5.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 木方 宏和 岐阜県大垣市赤坂町2093番地 河合石灰工 業株式会社内 Ｆターム(参考） 4G076 AA10 AB06 BA24 BA43 BA45 BD02 CA08 DA01 DA02 DA15 FA08 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hirokazu Kikata Kawai Lime Works, 2093 Akasaka-cho, Ogaki City, Gifu Prefecture Business F-term (reference) 4G076 AA10 AB06 BA24 BA43 BA45 BD02 CA08 DA01 DA02 DA15 FA08
Claims (3)
水蒸気雰囲気下、加熱しながら乾式養生することを特徴
とするベーマイトの製造方法。1. A method for producing boehmite, which comprises subjecting aluminum hydroxide powder to dry curing while heating in a steam atmosphere in a pressure vessel.
を特徴とする請求項１記載のベーマイトの製造方法。2. The method for producing boehmite according to claim 1, wherein the boehmite produced is plate-shaped.
を特徴とする請求項１又は請求項２記載のベーマイトの
製造方法。3. The method for producing boehmite according to claim 1 or 2, wherein the heating temperature is 140 to 300 ° C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002019581A JP4181777B2 (en) | 2002-01-29 | 2002-01-29 | Boehmite production method |
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| JP2003221227A true JP2003221227A (en) | 2003-08-05 |
| JP4181777B2 JP4181777B2 (en) | 2008-11-19 |
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