JP5120530B2 - Basic aluminum nitrate aqueous solution and method for producing the same - Google Patents
Basic aluminum nitrate aqueous solution and method for producing the same Download PDFInfo
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本発明は、保存安定性の優れた高濃度の塩基性硝酸アルミニウム水溶液及びその製造方法に関する。本発明の塩基性硝酸アルミニウム水溶液は、セラミックバインダー、触媒原料、顔料や充填剤などの表面改質剤、アルミナゾルやアルミナの製造原料あるいはアルミナゾルの粘度調整剤など種々の分野に利用される。 The present invention relates to a high-concentration basic aluminum nitrate aqueous solution excellent in storage stability and a method for producing the same. The basic aluminum nitrate aqueous solution of the present invention is used in various fields such as ceramic binders, catalyst raw materials, surface modifiers such as pigments and fillers, alumina sol and alumina production raw materials, and alumina sol viscosity modifiers.
塩基性硝酸アルミニウム水溶液が様々な分野において有用であることは古くから知られており、その製造方法や品質の改良に関して種々の提案がなされている。 It has been known for a long time that an aqueous solution of basic aluminum nitrate is useful in various fields, and various proposals have been made for improving its production method and quality.
アルミン酸ナトリウム水溶液と硝酸アルミニウム水溶液を、系のＡｌ2Ｏ3濃度８．４質量％、温度約８０℃にて混合溶解し、濃縮後析出物を除去することによるＡｌ2Ｏ3濃度２０．５質量％、Ａｌ／ＮＯ3化学当量比５．０２の塩基性硝酸アルミニウム水溶液の製造方法や、アルミン酸カリウム水溶液と硝酸水溶液を、系のＡｌ2Ｏ3濃度４．２３質量％にて溶解し、９５℃に加熱濃縮後析出物を除去することによるＡｌ2Ｏ3濃度２０質量％、Ａｌ／ＮＯ3化学当量比３．５の塩基性硝酸アルミニウム水溶液の製造方法が開示されている（特許文献１参照）。 An aqueous solution of sodium aluminate and an aqueous solution of aluminum nitrate are mixed and dissolved at a system Al 2 O 3 concentration of 8.4% by mass at a temperature of about 80 ° C., and after concentration, an Al 2 O 3 concentration of 20.5 is removed. A method for producing a basic aluminum nitrate aqueous solution having a mass%, Al / NO 3 chemical equivalent ratio of 5.02, and a potassium aluminate aqueous solution and an aqueous nitric acid solution are dissolved at a system Al 2 O 3 concentration of 4.23% by mass, A method of producing a basic aluminum nitrate aqueous solution having an Al 2 O 3 concentration of 20% by mass and an Al / NO 3 chemical equivalent ratio of 3.5 by removing the precipitate after heating and concentrating at 95 ° C. is disclosed (Patent Document 1). reference).
また、アルミン酸ナトリウム水溶液に炭酸ガスを加えて水酸化アルミニウムを析出させ、これを濾過、洗浄して得た水酸化アルミニウムペーストを硝酸に加えて加熱溶解することによるポリ硝酸アルミニウム溶液の製造方法が開示されている（特許文献２参照）。 In addition, a method for producing a polyaluminum nitrate solution by adding carbon dioxide to an aqueous solution of sodium aluminate to precipitate aluminum hydroxide, filtering and washing the resulting aluminum hydroxide paste to nitric acid and heating and dissolving the solution. It is disclosed (see Patent Document 2).
更には、約１〜４のｐＨ及び約３０℃から反応溶液の沸点までの温度においてアルミニウム金属を塩基性硝酸アルミニウムの存在下に濃度約５〜３０質量％の硝酸と反応させ、但しアルミニウム金属及び塩基性硝酸アルミニウム含有硝酸水溶液を向流で接触させることを特徴とする金属アルミニウムと硝酸水溶液の反応による塩基性硝酸アルミニウム溶液の製造方法が開示されている（特許文献３参照）。 Further, the aluminum metal is reacted with nitric acid having a concentration of about 5 to 30% by weight in the presence of basic aluminum nitrate at a pH of about 1 to 4 and a temperature of about 30 ° C. to the boiling point of the reaction solution, provided that the aluminum metal and A method for producing a basic aluminum nitrate solution by a reaction between metallic aluminum and an aqueous nitric acid solution, characterized in that a basic aluminum nitrate-containing nitric acid aqueous solution is brought into contact with the aqueous solution, is disclosed (see Patent Document 3).
しかしながら、これらの特許にて開示されている塩基性硝酸アルミニウム水溶液は、そのＡｌ2Ｏ3濃度が最大で約２０質量％であり、それ以上のＡｌ2Ｏ3濃度を有する塩基性硝酸アルミニウム水溶液については開示されていない。 However, the basic aluminum nitrate aqueous solution disclosed in these patents has a maximum Al 2 O 3 concentration of about 20% by mass, and has a higher Al 2 O 3 concentration. Is not disclosed.
アルミニウム酸化物と硝酸水溶液とを２５℃以下の温度で反応させて水酸化アルミニウムの沈殿を生成させ、これを分離、洗浄した後、硝酸又は硝酸アルミニウムの水溶液中で熟成することからなる安定な塩基性硝酸アルミニウム水溶液の製造方法が開示されている。しかしながら、この塩基性硝酸アルミニウム水溶液は、相変化防止剤など保存安定性を付与し得る助剤を含有したＡｌ2Ｏ3濃度２８〜２９質量％の紡糸溶液として開示されており、塩基性硝酸アルミニウム水溶液単独で高いＡｌ2Ｏ3濃度を有する場合の保存安定性については開示されていない（特許文献４参照）。
現在知られている塩基性硝酸アルミニウム水溶液は、Ａｌ2Ｏ3濃度２５質量％以上に濃縮を行った場合、濃縮終了後に静置保存した際に徐々に析出物を生じるため、保存安定性の問題が生じる。このために、多くの用途において各種の添加剤を加えて混合物を作成する際に、塩基性硝酸アルミニウム水溶液の濃度を高くできないことによって混合物の組成が制限されてしまい、目的とする性能を十分に達成できない場合がある。 The currently known basic aluminum nitrate aqueous solution, when concentrated to an Al 2 O 3 concentration of 25% by mass or more, gradually produces precipitates when stored at a standstill after the concentration is completed, thus causing storage stability problems. Occurs. For this reason, when preparing a mixture by adding various additives in many applications, the composition of the mixture is limited by the fact that the concentration of the basic aluminum nitrate aqueous solution cannot be increased, and the intended performance is sufficiently obtained. May not be achieved.
本発明は、塩基性硝酸アルミニウム水溶液に、乳酸、酒石酸及びクエン酸から選ばれる一種以上の酸を含有させることにより、高いＡｌ2Ｏ3濃度に濃縮をした場合でも保存安定性が良好で、使用場面に制限の少ない塩基性硝酸アルミニウム水溶液を提供しようとするものである。そして、この保存安定性の良好な塩基性硝酸アルミニウム水溶液の効率よい製造方法を提供しようとするものである。 In the present invention, the basic aluminum nitrate aqueous solution contains one or more acids selected from lactic acid, tartaric acid and citric acid, so that the storage stability is good even when concentrated to a high Al 2 O 3 concentration. It is intended to provide a basic aluminum nitrate aqueous solution with few restrictions on the scene. And it aims at providing the efficient manufacturing method of this basic aluminum nitrate aqueous solution with favorable storage stability.
本発明は、乳酸、酒石酸及びクエン酸から選ばれる一種以上の酸を、０．０１〜０．３の硝酸イオンに対するカルボン酸イオンのモル比（ＣＯＯ−／ＮＯ3 −モル比）で含有する、１２〜３５質量％のＡｌ2Ｏ3濃度及び０．８〜２．５の硝酸イオンとカルボン酸イオンとの合計モル数に対するアルミニウムのモル数の比｛Ａｌ／(ＮＯ3 −＋ＣＯＯ−)モル比｝を有する塩基性硝酸アルミニウム水溶液であり、更には硝酸又は硝酸アルミニウムと、乳酸、酒石酸及びクエン酸から選ばれる一種以上の酸との混合水溶液に水酸化アルミニウムのゲルを混合し加熱熟成すること、或いは硝酸又は硝酸アルミニウムの水溶液に水酸化アルミニウムを混合して加熱熟成した後に、乳酸、酒石酸及びクエン酸から選ばれる一種以上の酸を添加して混合することを特徴とする塩基性硝酸アルミニウム水溶液の製造方法である。 The present invention, lactic acid, one or more acids selected from tartaric acid and citric acid, the molar ratio of carboxylic acid ions to nitrate ions 0.01 to 0.3 containing at (COO - molar ratio - / NO 3), The ratio of the number of moles of aluminum to the total number of moles of 12 to 35 mass% Al 2 O 3 concentration and 0.8 to 2.5 nitrate and carboxylate ions {Al / (NO 3 − + COO − ) mole ratio }, Further mixed with aluminum hydroxide gel in a mixed aqueous solution of nitric acid or aluminum nitrate and one or more acids selected from lactic acid, tartaric acid and citric acid, and aged by heating. Alternatively, aluminum hydroxide is mixed with nitric acid or an aqueous solution of aluminum nitrate and heat-aged, and then one or more acids selected from lactic acid, tartaric acid and citric acid are added and mixed. A method for producing a basic aluminum nitrate aqueous solution, characterized in Rukoto.
本発明で得られた塩基性硝酸アルミニウム水溶液は、それ単独でＡｌ2Ｏ3濃度２３〜３５質量％に濃縮した場合でも保存中に析出物を生じることが無いので、各種の添加剤を加えて混合物を作成する際に、高いＡｌ2Ｏ3濃度に濃縮して使用することができる。そのため、作成する混合物の組成における制限が少なくなり、種々の用途において有益に使用することができる。 Since the basic aluminum nitrate aqueous solution obtained in the present invention alone does not produce precipitates during storage even when concentrated to an Al 2 O 3 concentration of 23 to 35% by mass, various additives are added. When preparing the mixture, it can be concentrated to a high Al 2 O 3 concentration and used. Therefore, there is less restriction on the composition of the mixture to be produced, and it can be used beneficially in various applications.
本発明の塩基性硝酸アルミニウム水溶液は、乳酸、酒石酸及びクエン酸から選ばれる一種以上の酸を含有する、高いＡｌ2Ｏ3濃度においても保存安定性の改良された塩基性硝酸アルミニウム水溶液である。 The basic aluminum nitrate aqueous solution of the present invention is a basic aluminum nitrate aqueous solution containing one or more acids selected from lactic acid, tartaric acid and citric acid and having improved storage stability even at high Al 2 O 3 concentrations.
本発明の塩基性硝酸アルミニウム水溶液は、Ａｌ(ＯH)X(ＮＯ3)3-X（但し、Xは０．９〜２．７の実数）の化学組成で示される化合物と乳酸、酒石酸及びクエン酸から選ばれる一種以上の酸との混合物であるだけでなく、場合によっては塩基性硝酸アルミニウム内の硝酸イオンを全部又は部分的に乳酸、酒石酸及びクエン酸から選ばれる一種以上のカルボン酸イオンに置換えた構造を有する塩基性アルミニウム塩も含有することがある。いずれの場合であっても、硝酸イオンとカルボン酸イオンの合計モル数に対するアルミニウムのモル数の比｛Ａｌ／(ＮＯ3 −＋ＣＯＯ−)モル比｝が０．８〜２．５であることが好ましい。この値が０．８よりも小さい場合には、得られる塩基性硝酸アルミニウム水溶液の粘度が高くなりすぎるため、実用上好ましくない。逆に２．５よりも大きい場合には、製造時に水酸化アルミニウムが十分に溶解されず、目的の塩基性硝酸アルミニウム水溶液が得られない。なお、Ａｌ(ＯH)X(ＮＯ3)3-X（但し、Xは０．９〜２．７の実数）の化学組成で示される化合物の水溶液は、場合によっては[Ａｌ(ＯH)X(ＮＯ3)3-X]Y（但し、Xは０．９〜２．７の実数、Yは２０未満の整数を示す）のようなポリマーを一部含有することがあるが、コロイド粒子は含有しない。 The basic aluminum nitrate aqueous solution of the present invention comprises a compound represented by a chemical composition of Al (OH) X (NO 3 ) 3-X (where X is a real number of 0.9 to 2.7), lactic acid, tartaric acid and citric acid. It is not only a mixture with one or more acids selected from acids, but in some cases nitrate ions in basic aluminum nitrate may be wholly or partly converted into one or more carboxylate ions selected from lactic acid, tartaric acid and citric acid. A basic aluminum salt having a substituted structure may also be contained. In any case, the ratio of the number of moles of aluminum to the total number of moles of nitrate ions and carboxylate ions {Al / (NO 3 − + COO − ) mole ratio} is 0.8 to 2.5. preferable. When this value is smaller than 0.8, the viscosity of the obtained basic aluminum nitrate aqueous solution becomes too high, which is not preferable for practical use. On the other hand, when the ratio is larger than 2.5, the aluminum hydroxide is not sufficiently dissolved at the time of production, and the desired basic aluminum nitrate aqueous solution cannot be obtained. An aqueous solution of a compound represented by a chemical composition of Al (OH) X (NO 3 ) 3-X (where X is a real number from 0.9 to 2.7) may be [Al (OH) X ( NO 3 ) 3-X ] Y (where X is a real number from 0.9 to 2.7, Y is an integer less than 20), but may contain some colloidal particles do not do.
本発明における乳酸、酒石酸及びクエン酸から選ばれる一種以上の酸の量は、硝酸イオンに対するカルボン酸イオンのモル比（ＣＯＯ−／ＮＯ3 −モル比）０．０１〜０．３の範囲内であることが好ましい。硝酸イオンに対するカルボン酸イオンのモル比（ＣＯＯ−／ＮＯ3 −モル比）が０．０１より小さい場合には、保存安定性の改良効果が小さすぎて目的とする性能が得られず、高いＡｌ2Ｏ3濃度に濃縮した後の静置保存時に析出物を生じるため好ましくない。また、硝酸イオンに対するカルボン酸イオンのモル比（ＣＯＯ−／ＮＯ3 −モル比）が０．３より大きい場合には、高いＡｌ2Ｏ3濃度に濃縮した後の静置保存において析出物の生成は抑制できるものの、塩基性硝酸アルミニウム水溶液が顕著に増粘し、最終的には液体の状態を保てなくなるため、実用上好ましくない。 The amount of one or more acid selected lactic, tartaric acid and citric acid in the present invention, the molar ratio of the carboxylic acid ion to nitrate ion in the range of (COO - - / NO 3 molar ratio) 0.01 to 0.3 Preferably there is. The molar ratio of carboxylic acid ions to nitrate ions when (COO - - / NO 3 molar ratio) is less than 0.01 is not obtained the desired performance characteristics and the effect of improving the storage stability is too small, high Al This is not preferable because precipitates are generated during storage at rest after concentration to 2 O 3 concentration. The molar ratio of the carboxylic acid ion to nitrate ion generated in (COO - molar ratio - / NO 3) is larger than 0.3, the high Al 2 O 3 precipitates in standing storage after concentration in concentration However, it is not practically preferable because the basic aluminum nitrate aqueous solution is remarkably thickened and cannot be maintained in a liquid state.
本発明の塩基性硝酸アルミニウム水溶液は、以下の二通りの方法にて製造することができる。なお、いずれの方法で製造しても、保存安定性の改良効果に差は見られない。
（１）硝酸又は硝酸アルミニウムと、乳酸、酒石酸及びクエン酸から選ばれる一種以上の酸との混合水溶液に水酸化アルミニウムを混合し、加熱熟成することを含む塩基性硝酸アルミニウム水溶液の製造方法。
（２）硝酸又は硝酸アルミニウムの水溶液に、水酸化アルミニウムを混合して加熱熟成した後に、乳酸、酒石酸及びクエン酸から選ばれる一種以上の酸を添加して混合することを含む塩基性硝酸アルミニウム水溶液の製造方法。
The basic aluminum nitrate aqueous solution of the present invention can be produced by the following two methods. In addition, even if it manufactures by any method, a difference is not seen in the improvement effect of storage stability.
(1) A method for producing a basic aqueous aluminum nitrate solution, which comprises mixing aluminum hydroxide in a mixed aqueous solution of nitric acid or aluminum nitrate and one or more acids selected from lactic acid, tartaric acid and citric acid, followed by heat aging.
(2) A basic aluminum nitrate aqueous solution comprising adding and mixing one or more acids selected from lactic acid, tartaric acid and citric acid after mixing and aging aluminum hydroxide in an aqueous solution of nitric acid or aluminum nitrate Manufacturing method.
本発明の原料となる水酸化アルミニウムは、工業材料として市販されているものを使用することができる。通常のバイヤー法により製造されたギブサイト構造を有する結晶性の水酸化アルミニウムや制酸剤として知られている乾燥水酸化アルミニウムゲルのような無定形の水酸化アルミニウムがその代表的な例として挙げられる。 As the aluminum hydroxide used as the raw material of the present invention, those commercially available as industrial materials can be used. Typical examples thereof include amorphous aluminum hydroxide having a gibbsite structure produced by a general buyer method and amorphous aluminum hydroxide such as dry aluminum hydroxide gel known as an antacid. .
また、本発明の原料となる水酸化アルミニウムは、従来から知られている任意の方法により製造することもできる。例えば、アルミン酸ナトリウム水溶液のようなアルミン酸アルカリ水溶液に炭酸ガスを添加して中和反応を行うことにより、水酸化アルミニウムを得ることができる。また、アルミン酸アルカリ水溶液に塩化アルミニウムや硝酸アルミニウム、硫酸アルミニウムなどを添加して中和反応を行うことによっても、水酸化アルミニウムを得ることができる。こうして得た水酸化アルミニウムは、そのままでも塩基性硝酸アルミニウム水溶液の原料として使用することができるが、必要に応じて濾過及び脱塩を行い、不要なイオンを除去してから塩基性硝酸アルミニウム水溶液の原料として使用することもできる。 Moreover, the aluminum hydroxide used as the raw material of the present invention can be produced by any conventionally known method. For example, aluminum hydroxide can be obtained by adding a carbon dioxide gas to an aqueous alkali aluminate solution such as an aqueous sodium aluminate solution to carry out a neutralization reaction. Alternatively, aluminum hydroxide can be obtained by adding aluminum chloride, aluminum nitrate, aluminum sulfate or the like to the aqueous alkali aluminate solution to carry out a neutralization reaction. The aluminum hydroxide thus obtained can be used as it is as a raw material for a basic aluminum nitrate aqueous solution, but after filtration and desalting as necessary to remove unnecessary ions, the basic aluminum nitrate aqueous solution It can also be used as a raw material.
硝酸又は硝酸アルミニウムの水溶液、或いは硝酸又は硝酸アルミニウムと、乳酸、酒石酸及びクエン酸から選ばれる一種以上の酸との混合水溶液に水酸化アルミニウムを添加する工程は、撹拌下に行うのが好ましい。この工程における温度及び時間は特に制限はないが、１５℃〜９９℃の温度で３０分〜５時間かけて行うのが良い。また、水酸化アルミニウムの添加は、所定の量を一度に添加しても良いし、数回に分けて添加しても良い。数回に分けて添加する場合は、異なる温度の下で段階的に行っても良い。 The step of adding aluminum hydroxide to nitric acid or an aqueous solution of aluminum nitrate or a mixed aqueous solution of nitric acid or aluminum nitrate and one or more acids selected from lactic acid, tartaric acid and citric acid is preferably performed with stirring. The temperature and time in this step are not particularly limited, but it is preferable to carry out at a temperature of 15 ° C to 99 ° C for 30 minutes to 5 hours. In addition, aluminum hydroxide may be added in a predetermined amount at once, or may be added in several times. When adding in several times, you may carry out in steps under different temperature.
本発明の塩基性硝酸アルミニウム水溶液を製造する際に行う加熱熟成工程は、好ましくは６０℃〜１３０℃の温度で３０分〜１２時間で行うのが良い。この加熱熟成工程も撹拌下に行うのが好ましい。この加熱熟成工程が３０分よりも短いと水酸化アルミニウムが十分に溶解せず、逆に１２時間よりも長くなると一旦生成した塩基性アルミニウム塩が更に反応して酸化アルミニウム水和物のコロイド粒子を生成してしまい、本発明の目的とする塩基性アルミニウム塩水溶液が得られなくなるため好ましくない。また、加熱熟成の温度は、６０℃より低いと水酸化アルミニウムが十分に溶解せず、１３０℃より高いと一旦生成した塩基性アルミニウム塩が更に反応して酸化アルミニウム水和物のコロイド粒子を生成してしまい、これも本発明の目的とする塩基性アルミニウム塩水溶液が得られなくなるため好ましくない。 The heat aging step performed when producing the basic aluminum nitrate aqueous solution of the present invention is preferably performed at a temperature of 60 ° C. to 130 ° C. for 30 minutes to 12 hours. This heat aging step is also preferably performed with stirring. If this heating and aging process is shorter than 30 minutes, the aluminum hydroxide is not sufficiently dissolved. Conversely, if it is longer than 12 hours, the basic aluminum salt once formed further reacts to form colloidal particles of aluminum oxide hydrate. This is not preferable because the basic aluminum salt aqueous solution targeted by the present invention cannot be obtained. Also, when the heat aging temperature is lower than 60 ° C, the aluminum hydroxide does not dissolve sufficiently, and when it is higher than 130 ° C, the basic aluminum salt once generated further reacts to produce colloidal particles of aluminum oxide hydrate. This is also not preferable because the basic aqueous aluminum salt solution of the present invention cannot be obtained.
本発明の製造工程における撹拌は、一般的に知られているパドル型、アンカー型、ファウドラー型、ディスパー型などの撹拌機やホモジナイザーなどを用いることができる。 For the stirring in the production process of the present invention, a generally known paddle type, anchor type, fowler type, disper type or the like stirrer or homogenizer can be used.
本発明の塩基性硝酸アルミニウム水溶液を製造する際は、Ａｌ2Ｏ3濃度を５〜２３質量％の範囲内で行うのが良い。より好ましくは、Ａｌ2Ｏ3濃度を１２〜２３質量％の範囲内で行うのが良い。製造時のＡｌ2Ｏ3濃度が５質量％より低い場合は、製造容器や保管スペースなどが必要以上に大きくなるだけで、得られる塩基性硝酸アルミニウム水溶液の品質には全く影響しないため、実用上好ましくない。また、製造時のＡｌ2Ｏ3濃度が１２〜２３質量％の範囲内であれば、用途によっては製造後に濃縮操作を行わなくても使用できることがあるため、より好ましい。製造時のＡｌ2Ｏ3濃度が２３質量％よりも高いと、水酸化アルミニウムのゲルが十分に溶解せず、目的とする塩基性硝酸アルミニウム水溶液が得られないため好ましくない。 When producing the basic aluminum nitrate aqueous solution of the present invention, the Al 2 O 3 concentration is preferably within a range of 5 to 23% by mass. More preferably, the Al 2 O 3 concentration is within the range of 12 to 23% by mass. If the Al 2 O 3 concentration during production is lower than 5% by mass, the production container and storage space will be larger than necessary, and the quality of the resulting basic aluminum nitrate aqueous solution will not be affected at all. It is not preferable. Further, as long as it is within the range concentration of Al 2 O 3 during manufacture of 12-23 wt%, for some applications it may be used even without concentrating operation after manufacture, more preferably. When the Al 2 O 3 concentration at the time of production is higher than 23% by mass, the aluminum hydroxide gel is not sufficiently dissolved and the intended basic aluminum nitrate aqueous solution cannot be obtained, which is not preferable.
また、本発明の塩基性硝酸アルミニウム水溶液は、Ａｌ2Ｏ3濃度５〜３５質量％の範囲内で必要に応じて濃縮を行うことができる。濃縮には、主として蒸発法を用いることができる。 Also, the basic aluminum nitrate solution of the present invention can be carried out optionally concentrated within the concentration of Al 2 O 3 5-35% by weight. For the concentration, an evaporation method can be mainly used.
本発明の塩基性硝酸アルミニウム水溶液は、各種組成物を作る目的で添加される成分を、従来の塩基性硝酸アルミニウム水溶液と同様に混合使用することができる。本発明の塩基性硝酸アルミニウム水溶液は、従来の塩基性硝酸アルミニウム水溶液に比べて、高いＡｌ2Ｏ3濃度を有する状態で使用することができるため、目的とする組成物の処方が組み易くなり、実用面において非常に有益である。 In the basic aqueous aluminum nitrate solution of the present invention, components added for the purpose of preparing various compositions can be mixed and used in the same manner as in the conventional basic aluminum nitrate aqueous solution. Since the basic aluminum nitrate aqueous solution of the present invention can be used in a state having a high Al 2 O 3 concentration as compared with the conventional basic aluminum nitrate aqueous solution, it becomes easy to formulate the target composition, It is very useful in practical use.
本発明の塩基性硝酸アルミニウム水溶液と混合使用される成分としては、アルミナゾル、シリカゾル、その他の金属酸化物ゾル、アルカリ金属珪酸塩水溶液、アルキルシリケートの部分加水分解液、ポリビニルアルコール、ヒドロキシエチルセルロース、ゼラチンなどの水溶性高分子、メラミン樹脂、尿素樹脂などの水溶性樹脂、アクリル系などの樹脂エマルジョン、ベントナイトやアルギン酸ソーダなどの増粘剤、アクリル樹脂などの有機溶媒溶解樹脂液、エチレングリコール、メチルアルコール、Ｎ，Ｎ−ジメチルホルムアミド（ＤＭＦ）などの有機溶媒、カップリング剤の部分加水分解液、界面活性剤、各種酸、各種アルカリ、耐火物粉末、金属粉末、顔料、塗料などが挙げられる。 Examples of the components used by mixing with the basic aluminum nitrate aqueous solution of the present invention include alumina sol, silica sol, other metal oxide sols, alkali metal silicate aqueous solutions, alkyl silicate partial hydrolysates, polyvinyl alcohol, hydroxyethyl cellulose, gelatin and the like. Water-soluble polymers, water-soluble resins such as melamine resin and urea resin, acrylic resin emulsions, thickeners such as bentonite and sodium alginate, organic solvent-soluble resin liquids such as acrylic resins, ethylene glycol, methyl alcohol, Examples thereof include organic solvents such as N, N-dimethylformamide (DMF), partial hydrolysis solutions of coupling agents, surfactants, various acids, various alkalis, refractory powders, metal powders, pigments, paints, and the like.
以下具体的に使用方法を述べる。 The usage method will be specifically described below.
本発明の塩基性硝酸アルミニウム水溶液は、各種触媒の用途に利用することができ、とくに自動車用触媒のバインダーや合成触媒のバインダーに有効に利用することが出来る。本発明の塩基性硝酸アルミニウム水溶液と、アルミナ、シリカ、アルミナ−シリカ系酸化物、ゼオライトなどの担体成分及び水などを混合して作成したスラリーを造粒、乾燥、粉砕することにより、粉末状や粒状の触媒担体を得ることができる。また、同様に作成したスラリーを使用して、ハニカム構造体のような触媒用途に適した基材上に塗布あるいは浸漬して乾燥することや、繊維質の基材に含浸させて乾燥することにより、種々の形態の触媒担体を得ることができる。 The basic aluminum nitrate aqueous solution of the present invention can be used in various catalyst applications, and in particular, can be effectively used as a binder for automobile catalysts and a binder for synthetic catalysts. A slurry prepared by mixing the basic aluminum nitrate aqueous solution of the present invention with a carrier component such as alumina, silica, alumina-silica-based oxide, zeolite, and water is granulated, dried, and pulverized to obtain powder or A granular catalyst support can be obtained. Also, by using the slurry prepared in the same manner, it can be applied to or dipped on a substrate suitable for a catalyst such as a honeycomb structure and dried, or impregnated into a fibrous substrate and dried. Various forms of catalyst carriers can be obtained.
本発明の塩基性硝酸アルミニウム水溶液は、セラミックスファイバー成形用のバインダーとして有効に利用することができる。本発明の塩基性硝酸アルミニウム水溶液と、アルミナ、シリカ、アルミナ−シリカ、ジルコニアなどのセラミックファイバー、水などを混合したスラリーに、必要に応じて澱粉などの凝集剤を加えてセラミックファイバーを凝集させた後、真空吸引などの方法で脱水し所定の形状に成形することにより、セラミックファイバーの成形品を得ることができる。これらの成形品は、耐熱性断熱材、その他の用途に使用される。 The basic aluminum nitrate aqueous solution of the present invention can be effectively used as a binder for forming ceramic fibers. The slurry was mixed with the basic aluminum nitrate aqueous solution of the present invention, ceramic fibers such as alumina, silica, alumina-silica, zirconia, water, and the like, and a flocculant such as starch was added as necessary to agglomerate the ceramic fibers. Thereafter, a ceramic fiber molded product can be obtained by dehydrating and molding into a predetermined shape by a method such as vacuum suction. These molded articles are used for heat-resistant heat insulating materials and other applications.
本発明の塩基性硝酸アルミニウム水溶液は、耐火物の含浸剤やバインダー、耐火コーティング剤用のバインダーなどに有効に利用することができ、セラミックス、ガラス、金属、プラスチックス、木材、紙などの基材に適用することができる。本発明の塩基性硝酸アルミニウム水溶液と、アルミナ、シリカ、アルミナ−シリカ、ジルコニア、珪酸アルミニウム、珪酸ジルコニウム、粘土などの耐火耐熱性粉末と、必要に応じて水、無機繊維、増粘剤、沈降防止剤などを混合したスラリーを、所定の形状の型枠に流し込み、乾燥硬化した後に脱型することにより目的とする耐火物を得ることができる。また、同様に製造したスラリーは、耐火コーティング剤として所望の基材上に塗布して使用することもできる。 The basic aluminum nitrate aqueous solution of the present invention can be effectively used as a refractory impregnating agent, a binder, a binder for a refractory coating agent, and a substrate such as ceramics, glass, metal, plastics, wood, paper, etc. Can be applied to. Basic aluminum nitrate aqueous solution of the present invention, fire-resistant and heat-resistant powder such as alumina, silica, alumina-silica, zirconia, aluminum silicate, zirconium silicate, clay, and water, inorganic fiber, thickener, settling prevention as required The target refractory can be obtained by pouring the slurry mixed with the agent or the like into a mold having a predetermined shape, drying and curing, and then demolding. Moreover, the slurry manufactured similarly can also be apply | coated and used on a desired base material as a fireproof coating agent.
本発明の塩基性硝酸アルミニウム水溶液は、アルミナファイバー用の原料として有効に利用することができる。本発明の塩基性硝酸アルミニウム水溶液と、水溶性高分子及び必要に応じてシリカゾルを混合して作成した紡糸液を用いて紡糸することによりアルミナファイバーを製造することができる。 The basic aluminum nitrate aqueous solution of the present invention can be effectively used as a raw material for alumina fibers. An alumina fiber can be produced by spinning using a spinning solution prepared by mixing the basic aluminum nitrate aqueous solution of the present invention, a water-soluble polymer and, if necessary, silica sol.
本発明の塩基性硝酸アルミニウム水溶液は、制汗剤の原料として有効に利用することができる。本発明の塩基性硝酸アルミニウム水溶液を噴霧乾燥などの方法で乾燥し粉砕して得た固体状の塩基性硝酸アルミニウムを使用し、必要に応じて溶媒や香料などの添加剤を添加して、溶液、エアロゾル、粉末、ゲル、クリームなど種々の形態の制汗剤を製造することができる。 The basic aluminum nitrate aqueous solution of the present invention can be effectively used as a raw material for an antiperspirant. Using solid basic aluminum nitrate obtained by drying and pulverizing the basic aluminum nitrate aqueous solution of the present invention by a method such as spray drying, and adding additives such as a solvent and a fragrance as necessary, a solution Various forms of antiperspirants such as aerosols, powders, gels and creams can be produced.
本発明の塩基性硝酸アルミニウム水溶液は、抄紙用の凝集剤として有効に利用することができる。 The basic aluminum nitrate aqueous solution of the present invention can be effectively used as a flocculant for papermaking.
本発明の塩基性硝酸アルミニウム水溶液は、その他にも各種のコーティング剤、顔料や充填剤などの表面改質剤、アルミナゾルやアルミナの製造原料あるいはアルミナゾルの粘度調整剤など種々の分野において、有効に利用することができる。 The basic aluminum nitrate aqueous solution of the present invention is effectively used in various other fields such as various coating agents, surface modifiers such as pigments and fillers, alumina sol and alumina raw materials, and alumina sol viscosity modifiers. can do.
本発明の塩基性硝酸アルミニウム水溶液は、シリカゾルと混合することにより、陽に帯電したシリカゾルを製造することができる。 The basic aluminum nitrate aqueous solution of the present invention can be mixed with a silica sol to produce a positively charged silica sol.
本発明の塩基性硝酸アルミニウム水溶液を使用して得た陽に帯電したシリカゾルは、各種触媒の用途、とくにＮＯｘ除去触媒のバインダーや補強剤として有効に利用することができる。本発明の塩基性硝酸アルミニウム水溶液を使用して得た陽に帯電したシリカゾルと、チタン、モリブデン、バナジウム、タングステン等の触媒活性を有する化合物を含有する触媒粉末とを混合し、成形、乾燥、焼成することにより、ＮＯｘ除去触媒を製造することができる。また、本発明の塩基性硝酸アルミニウム水溶液を使用して得た陽に帯電したシリカゾルと、チタン、モリブデン、バナジウム、タングステン等の触媒活性を有する化合物を含有する触媒粉末とを混合して得たスラリーを、種々の形状の触媒担体に塗布或いは浸漬することによっても、ＮＯｘ除去触媒を製造することができる。 The positively charged silica sol obtained by using the basic aluminum nitrate aqueous solution of the present invention can be effectively used for various catalysts, particularly as a binder or reinforcing agent for NO x removal catalyst. Mixing a positively charged silica sol obtained by using the basic aluminum nitrate aqueous solution of the present invention and a catalyst powder containing a compound having a catalytic activity such as titanium, molybdenum, vanadium, tungsten, etc., molding, drying and firing By doing so, a NO x removal catalyst can be manufactured. Further, a slurry obtained by mixing a positively charged silica sol obtained by using the basic aluminum nitrate aqueous solution of the present invention and a catalyst powder containing a compound having a catalytic activity such as titanium, molybdenum, vanadium, and tungsten. The NOx removal catalyst can also be produced by coating or dipping the catalyst on various types of catalyst carriers.
本発明の塩基性硝酸アルミニウム水溶液を使用して得た陽に帯電したシリカゾルと、アルミナ、シリカ、アルミナ−シリカ系酸化物、ゼオライトなどの担体成分及び水などを混合して作成したスラリーを乾燥することにより、粉末状や粒状の触媒担体を得ることができる。また、同様に作成したスラリーを使用して、ハニカム構造体のような触媒用途に適した基材上に塗布あるいは浸漬して乾燥することや、繊維質の基材に含浸させて乾燥することにより、種々の形態の触媒担体を得ることができる。 A slurry prepared by mixing a positively charged silica sol obtained by using the basic aluminum nitrate aqueous solution of the present invention, a carrier component such as alumina, silica, an alumina-silica oxide, zeolite, and water is dried. As a result, a powdery or granular catalyst carrier can be obtained. Also, by using the slurry prepared in the same manner, it can be applied to or dipped on a substrate suitable for a catalyst such as a honeycomb structure and dried, or impregnated into a fibrous substrate and dried. Various forms of catalyst carriers can be obtained.
また、本発明の塩基性硝酸アルミニウム水溶液を使用して得た陽に帯電したシリカゾルは、チタン、モリブデン、バナジウム、タングステンなどの触媒活性を有する化合物を含有する触媒粉末、アルミナ、シリカ、アルミナ−シリカ系酸化物、ゼオライトなどの担体成分、ハニカム構造体のような触媒用途に適した基材、及び各種バインダーを使用して製造した触媒に含浸させる方法により、触媒の補強剤として有効に利用することができる。 The positively charged silica sol obtained by using the basic aluminum nitrate aqueous solution of the present invention is a catalyst powder containing a compound having catalytic activity such as titanium, molybdenum, vanadium, tungsten, alumina, silica, alumina-silica. It can be effectively used as a catalyst reinforcing agent by a method of impregnating a catalyst produced using a carrier component such as a base oxide or zeolite, a substrate suitable for a catalyst such as a honeycomb structure, and various binders. Can do.
本発明の塩基性硝酸アルミニウム水溶液を用いて製造した陽に帯電したシリカゾルは、インクジェット記録媒体用のマイクロフィラーとして有効に利用することができる。本発明の塩基性硝酸アルミニウム水溶液を用いて製造した陽に帯電したシリカゾルと、ＰＶＡや樹脂エマルジョンなどの水性樹脂とを混合して、紙、プラスチックフィルム、シート上に塗工し、インク受容層を形成させることにより、インクの吸収性、印刷の鮮明性、色彩、光沢、表面の硬さなどの良好なインクジェット記録媒体を得ることができる。 The positively charged silica sol produced using the basic aluminum nitrate aqueous solution of the present invention can be effectively used as a microfiller for an ink jet recording medium. A positively charged silica sol produced using the basic aluminum nitrate aqueous solution of the present invention and an aqueous resin such as PVA or a resin emulsion are mixed and coated on paper, a plastic film, a sheet, and an ink receiving layer is formed. By forming the ink jet recording medium, it is possible to obtain an ink jet recording medium having good ink absorptivity, print sharpness, color, gloss, surface hardness, and the like.
本発明の塩基性硝酸アルミニウム水溶液を用いて製造した陽に帯電したシリカゾルは、鋼板用の耐蝕コーティング剤の材料として有効に利用することができ、自動車、家電、建材用に使用される亜鉛やアルミニウムなどのメッキ鋼板や、トランス、モーター用に使用される電磁鋼板に利用することができる。本発明の塩基性硝酸アルミニウム水溶液を用いて製造した陽に帯電したシリカゾルと、多価金属リン酸塩、硼酸、硼酸塩などの無機化合物、及び必要に応じて各種添加剤と混合して鋼板の表面に塗布、乾燥することにより、耐蝕コーティングされた鋼板を得ることができる。 The positively charged silica sol produced using the basic aluminum nitrate aqueous solution of the present invention can be effectively used as a material for a corrosion-resistant coating agent for steel sheet, and is used for automobiles, home appliances and building materials. It can be used for plated steel sheets such as, and electromagnetic steel sheets used for transformers and motors. The positively charged silica sol produced using the basic aqueous aluminum nitrate solution of the present invention, an inorganic compound such as polyvalent metal phosphate, boric acid and borate, and various additives as required are mixed with the steel sheet. By coating and drying on the surface, a corrosion-resistant coated steel sheet can be obtained.
本発明の塩基性硝酸アルミニウム水溶液及びその製造方法に関する、実施例及び比較例を以下に示す。 The Example and comparative example regarding the basic aluminum nitrate aqueous solution of this invention and its manufacturing method are shown below.
実施例１
２Ｌのガラス容器に純水３３５．９ｇを投入し、６０質量％硝酸水溶液２７４．４ｇおよび８８質量％乳酸４０．１ｇを加えて、ファウドラー型撹拌機を用いて撹拌混合した。そこに市販の乾燥水酸化アルミニウムゲル｛キョーワード２００Ｓ（商品名）：協和化学工業（株）製、Ａｌ2Ｏ3濃度５５質量％｝３６３．０ｇを少しずつ９０分間かけて添加して更に３０分間撹拌混合し、続いて水が蒸発しないように９０℃に加熱して３時間熟成した後、冷却して１０００ｇの塩基性硝酸アルミニウム水溶液を得た。得られた塩基性硝酸アルミニウム水溶液は、比重１．３８１、粘度１４．６ｍＰａ・ｓ、ｐＨ２．５、電導度４６．３ｍＳ／ｃｍ、Ａｌ2Ｏ3濃度２０．０質量％、硝酸のＮＯ3 −と乳酸のＣＯＯ−の合計モル数に対するＡｌのモル数の比：Ａｌ／(ＮＯ3 −＋ＣＯＯ−)モル比＝１．３１、乳酸のＣＯＯ−のモル数と硝酸のＮＯ3 −のモル数の比：ＣＯＯ−／ＮＯ3 −モル比＝０．１５であった。この塩基性硝酸アルミニウム水溶液は、２０℃で３ヶ月以上放置しても、沈降物や粘度増加、ゲル化などは見られず、安定であった。
Example 1
335.9 g of pure water was put into a 2 L glass container, 274.4 g of 60 mass% nitric acid aqueous solution and 40.1 g of 88 mass% lactic acid were added, and the mixture was stirred and mixed using a Faudler type stirrer. A commercial dry aluminum hydroxide gel {KYOWARD 200S (trade name): manufactured by Kyowa Chemical Industry Co., Ltd., Al 2 O 3 concentration 55 mass%} 363.0 g was added little by little over 90 minutes, and further 30 The mixture was stirred and mixed for minutes, and then heated to 90 ° C. so that water would not evaporate and aged for 3 hours, and then cooled to obtain 1000 g of a basic aluminum nitrate aqueous solution. The obtained basic aluminum nitrate aqueous solution has a specific gravity of 1.381, a viscosity of 14.6 mPa · s, a pH of 2.5, an electric conductivity of 46.3 mS / cm, an Al 2 O 3 concentration of 20.0% by mass, nitric acid NO 3 − lactic acid of COO - ratio of the number of moles of Al to the total number of moles of: Al / (NO 3 - + COO -) molar ratio = 1.31, lactic COO - moles of nitric acid NO 3 of - number of moles of ratio: COO - / NO 3 - were molar ratio = 0.15. Even when this basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 3 months or more, it did not show precipitates, increased viscosity, or gelation, and was stable.
得られた塩基性硝酸アルミニウム水溶液を減圧蒸留によりＡｌ2Ｏ3濃度２７．７質量％まで濃縮した。濃縮後の塩基性硝酸アルミニウム水溶液を２０℃で１０日間静置しても析出物は発生せず、安定な状態のままであった。 The obtained basic aluminum nitrate aqueous solution was concentrated by distillation under reduced pressure to an Al 2 O 3 concentration of 27.7% by mass. Even when the concentrated basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 10 days, no precipitate was generated, and it remained in a stable state.
実施例２
２Ｌのガラス容器に純水３５７．２ｇを投入し、６０質量％硝酸水溶液２７４．４ｇを加えて、ファウドラー型撹拌機を用いて撹拌混合した。そこに市販の乾燥水酸化アルミニウムゲル｛キョーワード２００Ｓ（商品名）｝３６３．０ｇを少しずつ９０分間かけて添加して更に３０分間撹拌混合し、続いて水が蒸発しないように９０℃に加熱して３時間熟成した後、冷却した。そこに８８質量％乳酸５．４３ｇを投入し、３０分間撹拌して１０００ｇの塩基性硝酸アルミニウム水溶液を得た。得られた塩基性硝酸アルミニウム水溶液は、比重１．３６６、粘度１０．６ｍＰａ・ｓ、ｐＨ２．６、電導度５９．９ｍＳ／ｃｍ、Ａｌ2Ｏ3濃度２０．０質量％、硝酸のＮＯ3 −と乳酸のＣＯＯ−の合計モル数に対するＡｌのモル数の比：Ａｌ／(ＮＯ3 −＋ＣＯＯ−)モル比＝１．４７、乳酸のＣＯＯ−のモル数と硝酸のＮＯ3 −のモル数の比：ＣＯＯ−／ＮＯ3 −モル比＝０．０２であった。この塩基性硝酸アルミニウム水溶液は、２０℃で３ヶ月以上放置しても、沈降物や粘度増加、ゲル化などは見られず、安定であった。
Example 2
357.2 g of pure water was put into a 2 L glass container, 274.4 g of a 60 mass% nitric acid aqueous solution was added, and the mixture was stirred and mixed using a Faudler type stirrer. 363.0 g of commercially available dry aluminum hydroxide gel {KYOWARD 200S (trade name)} was added thereto gradually over 90 minutes, and the mixture was further stirred for 30 minutes and then heated to 90 ° C. so that water would not evaporate. The mixture was aged for 3 hours and then cooled. Thereto, 4.43 g of 88% by mass lactic acid was added and stirred for 30 minutes to obtain 1000 g of a basic aqueous aluminum nitrate solution. The obtained basic aluminum nitrate aqueous solution has a specific gravity of 1.366, a viscosity of 10.6 mPa · s, a pH of 2.6, an electric conductivity of 59.9 mS / cm, an Al 2 O 3 concentration of 20.0% by mass, nitric acid NO 3 − The ratio of the number of moles of Al to the total number of moles of COO − in lactic acid: Al / (NO 3 − + COO − ) mole ratio = 1.47, the number of moles of COO − in lactic acid and the number of moles of NO 3 − in nitric acid ratio: COO - / NO 3 - were molar ratio = 0.02. Even when this basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 3 months or more, it did not show precipitates, increased viscosity, or gelation, and was stable.
得られた塩基性硝酸アルミニウム水溶液を減圧蒸留によりＡｌ2Ｏ3濃度３０．０質量％まで濃縮した。濃縮後の塩基性硝酸アルミニウム水溶液を２０℃で１０日間静置しても析出物は発生せず、安定な状態のままであった。 The obtained basic aluminum nitrate aqueous solution was concentrated by distillation under reduced pressure to an Al 2 O 3 concentration of 30.0% by mass. Even when the concentrated basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 10 days, no precipitate was generated, and it remained in a stable state.
実施例３
２Ｌのガラス容器に純水４０８．８ｇを投入し、６０質量％硝酸水溶液２０５．９ｇおよび８８質量％乳酸２２．３２ｇを加えて、ファウドラー型撹拌機を用いて撹拌混合した。そこに市販の乾燥水酸化アルミニウムゲル｛キョーワード２００Ｓ（商品名）｝１２１．０ｇを１５分間で添加した後１5分間撹拌混合した。これを８０℃に加熱して、更に市販の乾燥水酸化アルミニウムゲル｛キョーワード２００Ｓ（商品名）｝２４２．０ｇを１時間かけて添加した。続いて水が蒸発しないように９０℃に加熱して３時間熟成した後、冷却して１０００ｇの塩基性硝酸アルミニウム水溶液を得た。得られた塩基性硝酸アルミニウム水溶液は、比重１．３３１、粘度１０．２ｍＰａ・ｓ、ｐＨ３．１、電導度４７．６ｍＳ／ｃｍ、Ａｌ2Ｏ3濃度２０．０質量％、硝酸のＮＯ3 −と乳酸のＣＯＯ−の合計モル数に対するＡｌのモル数の比：Ａｌ／(ＮＯ3 −＋ＣＯＯ−)モル比＝１．８、乳酸のＣＯＯ−のモル数と硝酸のＮＯ3 −のモル数の比：ＣＯＯ−／ＮＯ3 −モル比＝０．１１であった。この塩基性硝酸アルミニウム水溶液は、２０℃で３ヶ月以上放置しても、沈降物や粘度増加、ゲル化などは見られず、安定であった。
Example 3
408.8 g of pure water was put into a 2 L glass container, 205.9 g of 60% by mass nitric acid aqueous solution and 22.32 g of 88% by mass lactic acid were added, and the mixture was stirred and mixed using a Faudler type stirrer. Thereto, 121.0 g of a commercially available dry aluminum hydroxide gel {KYOWARD 200S (trade name)} was added over 15 minutes, followed by stirring and mixing for 15 minutes. This was heated to 80 ° C., and 242.0 g of a commercially available dried aluminum hydroxide gel {KYOWARD 200S (trade name)} was added over 1 hour. Subsequently, the mixture was heated to 90 ° C. for aging for 3 hours so as not to evaporate water, and then cooled to obtain 1000 g of a basic aluminum nitrate aqueous solution. The obtained basic aluminum nitrate aqueous solution has a specific gravity of 1.331, a viscosity of 10.2 mPa · s, a pH of 3.1, an electric conductivity of 47.6 mS / cm, an Al 2 O 3 concentration of 20.0% by mass, nitric acid NO 3 − The ratio of the number of moles of Al to the total number of moles of COO − in lactic acid: Al / (NO 3 − + COO − ) mole ratio = 1.8, the number of moles of COO − in lactic acid and the number of moles of NO 3 − in nitric acid ratio: COO - / NO 3 - were molar ratio = 0.11. Even when this basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 3 months or more, it did not show precipitates, increased viscosity, or gelation, and was stable.
得られた塩基性硝酸アルミニウム水溶液を減圧蒸留によりＡｌ2Ｏ3濃度３０．６質量％まで濃縮した。濃縮後の塩基性硝酸アルミニウム水溶液を２０℃で１０日間静置しても析出物は発生せず、安定な状態のままであった。 The obtained basic aluminum nitrate aqueous solution was concentrated by distillation under reduced pressure to an Al 2 O 3 concentration of 30.6% by mass. Even when the concentrated basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 10 days, no precipitate was generated, and it remained in a stable state.
実施例４
２Ｌのガラス容器に純水３５２．８ｇを投入し、６０質量％硝酸水溶液２７４．４ｇおよびＬ（＋）酒石酸９．８５ｇを加えて、ファウドラー型撹拌機を用いて撹拌混合した。そこに市販の乾燥水酸化アルミニウムゲル｛キョーワード２００Ｓ（商品名）｝３６３．０ｇを少しずつ９０分間かけて添加して更に３０分間撹拌混合し、続いて水が蒸発しないように９０℃に加熱して３時間熟成した後、冷却して１０００ｇの塩基性硝酸アルミニウム水溶液を得た。得られた塩基性硝酸アルミニウム水溶液は、比重１．３７６、粘度１２．６ｍＰａ・ｓ、ｐＨ２．６、電導度５６．４ｍＳ／ｃｍ、Ａｌ2Ｏ3濃度２０．０質量％、硝酸のＮＯ3 −とＬ(+)酒石酸のＣＯＯ−の合計モル数に対するＡｌのモル数の比：Ａｌ／(ＮＯ3 −＋ＣＯＯ−)モル比＝１．４３、Ｌ(+)酒石酸のＣＯＯ−のモル数と硝酸のＮＯ3 −のモル数の比：ＣＯＯ−／ＮＯ3 −モル比＝０．０５であった。この塩基性硝酸アルミニウム水溶液は、２０℃で３ヶ月以上放置しても、沈降物や粘度増加、ゲル化などは見られず、安定であった。
Example 4
352.8 g of pure water was put into a 2 L glass container, 274.4 g of 60 mass% nitric acid aqueous solution and 9.85 g of L (+) tartaric acid were added, and the mixture was stirred and mixed using a Faudler type stirrer. 363.0 g of commercially available dry aluminum hydroxide gel {KYOWARD 200S (trade name)} was added thereto gradually over 90 minutes, and the mixture was further stirred for 30 minutes and then heated to 90 ° C. so that water would not evaporate. The mixture was aged for 3 hours and then cooled to obtain 1000 g of a basic aqueous aluminum nitrate solution. The obtained basic aluminum nitrate aqueous solution has a specific gravity of 1.376, a viscosity of 12.6 mPa · s, a pH of 2.6, an electric conductivity of 56.4 mS / cm, an Al 2 O 3 concentration of 20.0% by mass, nitric acid NO 3 − Ratio of the number of moles of Al to the total number of moles of COO − in L (+) tartaric acid: Al / (NO 3 − + COO − ) molar ratio = 1.43, the number of moles of COO − in L (+) tartaric acid and nitric acid the ratio of moles of - NO 3 of: COO - / NO 3 - were molar ratio = 0.05. Even when this basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 3 months or more, it did not show precipitates, increased viscosity, or gelation, and was stable.
得られた塩基性硝酸アルミニウム水溶液を減圧蒸留によりＡｌ2Ｏ3濃度２０．０質量％まで濃縮した。濃縮後の塩基性硝酸アルミニウム水溶液を２０℃で１０日間静置しても析出物は発生せず、安定な状態のままであった。 The obtained basic aluminum nitrate aqueous solution was concentrated by distillation under reduced pressure to an Al 2 O 3 concentration of 20.0% by mass. Even when the concentrated basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 10 days, no precipitate was generated, and it remained in a stable state.
実施例５
２Ｌのガラス容器に純水３５８．１ｇを投入し、６０質量％硝酸水溶液２７４．４ｇおよびクエン酸一水和物６．３７ｇを加えて、ファウドラー型撹拌機を用いて撹拌混合した。そこに市販の乾燥水酸化アルミニウムゲル｛キョーワード２００Ｓ（商品名）｝３６３．０ｇを少しずつ９０分間かけて添加して更に３０分間撹拌混合し、続いて水が蒸発しないように９０℃に加熱して３時間熟成した後、冷却して１０００ｇの塩基性硝酸アルミニウム水溶液を得た。得られた塩基性硝酸アルミニウム水溶液は、比重１．３７１、粘度１１．２ｍＰａ・ｓ、ｐＨ２．６、電導度６０．１ｍＳ／ｃｍ、Ａｌ2Ｏ3濃度２０．０質量％、硝酸のＮＯ3 −とクエン酸のＣＯＯ−の合計モル数に対するＡｌのモル数の比：Ａｌ／(ＮＯ3 −＋ＣＯＯ−)モル比＝１．４５、クエン酸のＣＯＯ−のモル数と硝酸のＮＯ3 −のモル数の比：ＣＯＯ−／ＮＯ3 −モル比＝０．０３５であった。この塩基性硝酸アルミニウム水溶液は、２０℃で３ヶ月以上放置しても、沈降物や粘度増加、ゲル化などは見られず、安定であった。
Example 5
358.1 g of pure water was put into a 2 L glass container, 274.4 g of a 60 mass% nitric acid aqueous solution and 6.37 g of citric acid monohydrate were added, and the mixture was stirred and mixed using a Faudler type stirrer. 363.0 g of commercially available dry aluminum hydroxide gel {KYOWARD 200S (trade name)} was added thereto gradually over 90 minutes, and the mixture was further stirred for 30 minutes and then heated to 90 ° C. so that water would not evaporate. The mixture was aged for 3 hours and then cooled to obtain 1000 g of a basic aqueous aluminum nitrate solution. The obtained basic aluminum nitrate aqueous solution has a specific gravity of 1.371, a viscosity of 11.2 mPa · s, a pH of 2.6, an electric conductivity of 60.1 mS / cm, an Al 2 O 3 concentration of 20.0% by mass, nitric acid NO 3 − Ratio of the number of moles of Al to the total number of moles of COO − in citric acid: Al / (NO 3 − + COO − ) mole ratio = 1.45, the number of moles of COO − in citric acid and the mole of NO 3 − in nitric acid the number ratio: COO - / NO 3 - were molar ratio = 0.035. Even when this basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 3 months or more, it did not show precipitates, increased viscosity, or gelation, and was stable.
得られた塩基性硝酸アルミニウム水溶液を減圧蒸留によりＡｌ2Ｏ3濃度２８．３質量％まで濃縮した。濃縮後の塩基性硝酸アルミニウム水溶液を２０℃で１０日間静置しても析出物は発生せず、安定な状態のままであった。 The obtained basic aluminum nitrate aqueous solution was concentrated by distillation under reduced pressure to an Al 2 O 3 concentration of 28.3% by mass. Even when the concentrated basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 10 days, no precipitate was generated, and it remained in a stable state.
実施例６
ガス吹き込み管を装着した３Ｌステンレス製容器に市販の液体アルミン酸ナトリウム｛ＡＳ−１７（商品名）：（株）北陸化成工業所製、Ａｌ2Ｏ3濃度１９．１質量％、Na2Ｏ濃度１９．４質量％｝３２５ｇ及び純水１２１０ｇを投入して、撹拌している中に、ガス状二酸化炭素を流速２Ｌ／ｍｉｎの速度で１５分間導入した。ガス状二酸化炭素導入直後の反応混合物スラリーは、ｐＨ１１．０、液温３０℃であった。続いて、この反応混合物スラリーを、ディスパー型撹拌機を用いて２３００ｒｐｍにて４時間撹拌し、撹拌処理済みの反応混合物スラリー（ｐＨ１１．３、Ａｌ2Ｏ3濃度４．０質量％）１５８０ｇを得た。以上の操作を更に２回行って得た反応混合物スラリー４７４０ｇを、ヌッチェを用いて濾過し、更に純水を注入して濾水の電導度が２０μＳ／ｃｍ以下になるまで洗浄して、水酸化アルミニウムのウェットゲル（Ａｌ2Ｏ3濃度１８．１質量％）１０５０ｇを得た。
Example 6
Commercially available liquid sodium aluminate {AS-17 (trade name) manufactured by Hokuriku Kasei Kogyo Co., Ltd., Al 2 O 3 concentration 19.1% by mass, Na 2 O concentration in a 3 L stainless steel vessel equipped with a gas blowing tube 19.4 mass%} 325 g and 1210 g of pure water were added, and while stirring, gaseous carbon dioxide was introduced at a flow rate of 2 L / min for 15 minutes. The reaction mixture slurry immediately after the introduction of gaseous carbon dioxide had a pH of 11.0 and a liquid temperature of 30 ° C. Subsequently, this reaction mixture slurry was stirred at 2300 rpm for 4 hours using a disper-type stirrer to obtain 1580 g of a reaction mixture slurry (pH 11.3, Al 2 O 3 concentration 4.0% by mass) that had been stirred. It was. 4740 g of the reaction mixture slurry obtained by performing the above operation two more times is filtered using a Nutsche, and further pure water is injected to wash the filtrate until the conductivity of the filtrate is 20 μS / cm or less. 1050 g of aluminum wet gel (Al 2 O 3 concentration 18.1% by mass) was obtained.
別途用意した２Ｌのガラス容器に６０質量％硝酸水溶液１５４．４ｇおよび８８質量％乳酸１６．７４ｇを加えて、ファウドラー型撹拌機を用いて撹拌混合した。そこに上記水酸化アルミニウムのウェットゲル８２８．８ｇを解砕しながら少しずつ２時間かけて添加して更に３０分間撹拌混合し、続いて水が蒸発しないように９０℃に加熱して３時間熟成した後、冷却して１０００ｇの塩基性硝酸アルミニウム水溶液を得た。得られた塩基性硝酸アルミニウム水溶液は、比重１．２３２、粘度６．７ｍＰａ・ｓ、ｐＨ３．４、電導度４４．７ｍＳ／ｃｍ、Ａｌ2Ｏ3濃度１５．０質量％、硝酸のＮＯ3 −と乳酸のＣＯＯ−の合計モル数に対するＡｌのモル数の比：Ａｌ／(ＮＯ3 −＋ＣＯＯ−)モル比＝１．８０、乳酸のＣＯＯ−のモル数と硝酸のＮＯ3 −のモル数の比：ＣＯＯ−／ＮＯ3 −モル比＝０．１１であった。この塩基性硝酸アルミニウム水溶液は、２０℃で３ヶ月以上放置しても、沈降物や粘度増加、ゲル化などは見られず、安定であった。 154.4 g of 60 mass% nitric acid aqueous solution and 16.74 g of 88 mass% lactic acid were added to a 2 L glass container prepared separately, and the mixture was stirred and mixed using a Faudler type stirrer. 828.8 g of the aluminum hydroxide wet gel was crushed and gradually added over 2 hours, and further stirred and mixed for 30 minutes. Subsequently, the mixture was aged for 3 hours by heating to 90 ° C. so that water would not evaporate. After cooling, 1000 g of basic aluminum nitrate aqueous solution was obtained. The obtained basic aluminum nitrate aqueous solution has a specific gravity of 1.232, a viscosity of 6.7 mPa · s, a pH of 3.4, an electric conductivity of 44.7 mS / cm, an Al 2 O 3 concentration of 15.0% by mass, nitric acid NO 3 − The ratio of the number of moles of Al to the total number of moles of COO − of lactic acid: Al / (NO 3 − + COO − ) mole ratio = 1.80, the number of moles of COO − of lactic acid and the number of moles of NO 3 − of nitric acid ratio: COO - / NO 3 - were molar ratio = 0.11. Even when this basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 3 months or more, it did not show precipitates, increased viscosity, or gelation, and was stable.
得られた塩基性硝酸アルミニウム水溶液を減圧蒸留によりＡｌ2Ｏ3濃度３０．０質量％まで濃縮した。濃縮後の塩基性硝酸アルミニウム水溶液を２０℃で１０日間静置しても析出物は発生せず、安定な状態のままであった。 The obtained basic aluminum nitrate aqueous solution was concentrated by distillation under reduced pressure to an Al 2 O 3 concentration of 30.0% by mass. Even when the concentrated basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 10 days, no precipitate was generated, and it remained in a stable state.
実施例７
２Ｌのガラス容器に純水３８２．０ｇを投入し、硝酸アルミニウム９水塩３２６．６ｇを少しずつゆっくり加え、更に８８質量％乳酸９．１ｇを加えて、ファウドラー型撹拌機を用いて撹拌混合した。そこに市販の乾燥水酸化アルミニウムゲル｛キョーワード２００Ｓ（商品名）｝２８２．３ｇを少しずつ６０分間かけて添加して更に３０分間撹拌混合し、続いて水が蒸発しないように９０℃に加熱して３時間熟成した後、冷却して１０００ｇの塩基性硝酸アルミニウム水溶液を得た。得られた塩基性硝酸アルミニウム水溶液は、比重１．３６６、粘度１０．５ｍＰａ・ｓ、ｐＨ２．７、電導度５９．３ｍＳ／ｃｍ、Ａｌ2Ｏ3濃度２０．０質量％、硝酸のＮＯ3 −と乳酸のＣＯＯ−の合計モル数に対するＡｌのモル数の比：Ａｌ／(ＮＯ3 −＋ＣＯＯ−)モル比＝１．４５、乳酸のＣＯＯ−のモル数と硝酸のＮＯ3 −のモル数の比：ＣＯＯ−／ＮＯ3 −モル比＝０．０３５であった。この塩基性硝酸アルミニウム水溶液は、２０℃で３ヶ月以上放置しても、沈降物や粘度増加、ゲル化などは見られず、安定であった。
Example 7
382.0 g of pure water was put into a 2 L glass container, 326.6 g of aluminum nitrate nonahydrate was slowly added little by little, and 9.1 g of 88% by mass lactic acid was further added, and the mixture was stirred and mixed using a Fowler type stirrer. . 282.3 g of commercially available dry aluminum hydroxide gel {KYOWARD 200S (trade name)} was added to the solution over 60 minutes, and the mixture was further stirred and mixed for 30 minutes. Subsequently, the mixture was heated to 90 ° C. so as not to evaporate water. The mixture was aged for 3 hours and then cooled to obtain 1000 g of a basic aqueous aluminum nitrate solution. The obtained basic aluminum nitrate aqueous solution has a specific gravity of 1.366, a viscosity of 10.5 mPa · s, a pH of 2.7, an electrical conductivity of 59.3 mS / cm, an Al 2 O 3 concentration of 20.0% by mass, nitric acid NO 3 − lactic acid of COO - ratio of the number of moles of Al to the total number of moles of: Al / (NO 3 - + COO -) molar ratio = 1.45, lactic COO - moles of nitric acid NO 3 of - number of moles of ratio: COO - / NO 3 - were molar ratio = 0.035. Even when this basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 3 months or more, it did not show precipitates, increased viscosity, or gelation, and was stable.
得られた塩基性硝酸アルミニウム水溶液を減圧蒸留によりＡｌ2Ｏ3濃度３０．０質量％まで濃縮した。濃縮後の塩基性硝酸アルミニウム水溶液を２０℃で１０日間静置しても析出物は発生せず、安定な状態のままであった。 The obtained basic aluminum nitrate aqueous solution was concentrated by distillation under reduced pressure to an Al 2 O 3 concentration of 30.0% by mass. Even when the concentrated basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 10 days, no precipitate was generated, and it remained in a stable state.
比較例１
２Ｌのガラス容器に純水３６２．６ｇを投入し、６０質量％硝酸水溶液２７４．４ｇを加えて、ファウドラー型撹拌機を用いて撹拌混合した。そこに市販の乾燥水酸化アルミニウムゲル｛キョーワード２００Ｓ（商品名）｝３６３．０ｇを少しずつ９０分間かけて添加して更に３０分間撹拌混合し、続いて水が蒸発しないように９０℃に加熱して３時間熟成した後、冷却して１０００ｇの塩基性硝酸アルミニウム水溶液を得た。得られた塩基性硝酸アルミニウム水溶液は、比重１．３６４、粘度９．６ｍＰａ・ｓ、ｐＨ２．６、電導度６５．６ｍＳ／ｃｍ、Ａｌ2Ｏ3濃度２０．０質量％、硝酸のＮＯ3 −のモル数に対するＡｌのモル数の比：Ａｌ／ＮＯ3 −モル比＝１．５０であった。この塩基性硝酸アルミニウム水溶液は、２０℃で３ヶ月以上放置しても、沈降物や粘度増加、ゲル化などは見られず、安定であった。
Comparative Example 1
362.6 g of pure water was put into a 2 L glass container, 274.4 g of 60 mass% nitric acid aqueous solution was added, and the mixture was stirred and mixed using a Faudler type stirrer. 363.0 g of commercially available dry aluminum hydroxide gel {KYOWARD 200S (trade name)} was added thereto gradually over 90 minutes, and the mixture was further stirred for 30 minutes and then heated to 90 ° C. so that water would not evaporate. The mixture was aged for 3 hours and then cooled to obtain 1000 g of a basic aqueous aluminum nitrate solution. The obtained basic aluminum nitrate aqueous solution had a specific gravity of 1.364, a viscosity of 9.6 mPa · s, a pH of 2.6, an electric conductivity of 65.6 mS / cm, an Al 2 O 3 concentration of 20.0% by mass, nitric acid NO 3 − number of moles of Al to the number of moles: Al / NO 3 - were molar ratio = 1.50. Even when this basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 3 months or more, it did not show precipitates, increased viscosity, or gelation, and was stable.
得られた塩基性硝酸アルミニウム水溶液を減圧蒸留によりＡｌ2Ｏ3濃度２７．０質量％まで濃縮した。濃縮後の塩基性硝酸アルミニウム水溶液を２０℃で静置したところ、１日後に析出物が僅かに認められ、１０日後には多量の析出物が発生した。 The obtained basic aluminum nitrate aqueous solution was concentrated by distillation under reduced pressure to an Al 2 O 3 concentration of 27.0% by mass. When the concentrated basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C., a slight amount of precipitate was observed after 1 day, and a large amount of precipitate was generated after 10 days.
比較例２
２Ｌのガラス容器に純水３６３．３ｇを投入し、６０質量％硝酸水溶液３４３．２ｇを加えて、ファウドラー型撹拌機を用いて撹拌混合した。そこに市販の乾燥水酸化アルミニウムゲル｛キョーワード２００Ｓ（商品名）｝３６３．０ｇを少しずつ９０分間かけて添加して更に３０分間撹拌混合し、続いて水が蒸発しないように９０℃に加熱して３時間熟成した後、冷却して１０００ｇの塩基性硝酸アルミニウム水溶液を得た。得られた塩基性硝酸アルミニウム水溶液は、比重１．３９３、粘度１１．９ｍＰａ・ｓ、ｐＨ２．２、電導度６２．１ｍＳ／ｃｍ、Ａｌ2Ｏ3濃度１８．７質量％、硝酸のＮＯ3 −のモル数に対するＡｌのモル数の比：Ａｌ／ＮＯ3 −モル比＝１．２０であった。この塩基性硝酸アルミニウム水溶液は、２０℃で３ヶ月以上放置しても、沈降物や粘度増加、ゲル化などは見られず、安定であった。
Comparative Example 2
363.3 g of pure water was put into a 2 L glass container, 343.2 g of 60% by mass nitric acid aqueous solution was added, and the mixture was stirred and mixed using a Faudler type stirrer. 363.0 g of commercially available dry aluminum hydroxide gel {KYOWARD 200S (trade name)} was added thereto gradually over 90 minutes, and the mixture was further stirred for 30 minutes and then heated to 90 ° C. so that water would not evaporate. The mixture was aged for 3 hours and then cooled to obtain 1000 g of a basic aqueous aluminum nitrate solution. The obtained basic aluminum nitrate aqueous solution has a specific gravity of 1.393, a viscosity of 11.9 mPa · s, a pH of 2.2, an electric conductivity of 62.1 mS / cm, an Al 2 O 3 concentration of 18.7% by mass, and NO 3 − in nitric acid. number of moles of Al to the number of moles: Al / NO 3 - were molar ratio = 1.20. Even when this basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 3 months or more, it did not show precipitates, increased viscosity, or gelation, and was stable.
得られた塩基性硝酸アルミニウム水溶液を減圧蒸留によりＡｌ2Ｏ3濃度２７．３質量％まで濃縮した。濃縮後の塩基性硝酸アルミニウム水溶液を２０℃で静置したところ、１日後に多量の析出物が発生し、１０日後には更に析出物が増加した。 The obtained basic aluminum nitrate aqueous solution was concentrated by distillation under reduced pressure to an Al 2 O 3 concentration of 27.3 mass%. When the concentrated basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C., a large amount of precipitate was generated after 1 day, and the precipitate was further increased after 10 days.
比較例３
２Ｌのガラス容器に純水２２８．８ｇを投入し、６０質量％硝酸水溶液２７４．４ｇおよび８８質量％乳酸１３３．８ｇを加えて、ファウドラー型撹拌機を用いて撹拌混合した。そこに市販の乾燥水酸化アルミニウムゲル｛キョーワード２００Ｓ（商品名）｝３６３．０ｇを少しずつ９０分間かけて添加して更に３０分間撹拌混合し、続いて水が蒸発しないように９０℃に加熱して３時間熟成した後、冷却して１０００ｇの塩基性硝酸アルミニウム水溶液を得た。得られた塩基性硝酸アルミニウム水溶液は、比重１．３７８、粘度３９．２ｍＰａ・ｓ、ｐＨ２．６、電導度２８．０ｍＳ／ｃｍ、Ａｌ2Ｏ3濃度２０．０質量％、硝酸のＮＯ3 −と乳酸のＣＯＯ−の合計モル数に対するＡｌのモル数の比：Ａｌ／(ＮＯ3 −＋ＣＯＯ−)モル比＝１．００、乳酸のＣＯＯ−のモル数と硝酸のＮＯ3 −のモル数の比：ＣＯＯ−／ＮＯ3 −モル比＝０．５であった。この塩基性硝酸アルミニウム水溶液は、２０℃で３ヶ月以上放置しても、沈降物や粘度増加、ゲル化などは見られず、安定であった。
Comparative Example 3
228.8 g of pure water was put into a 2 L glass container, 274.4 g of 60% by mass nitric acid aqueous solution and 133.8 g of 88% by mass lactic acid were added, and the mixture was stirred and mixed using a Faudler type stirrer. 363.0 g of commercially available dry aluminum hydroxide gel {KYOWARD 200S (trade name)} was added thereto gradually over 90 minutes, and the mixture was further stirred for 30 minutes and then heated to 90 ° C. so that water would not evaporate. The mixture was aged for 3 hours and then cooled to obtain 1000 g of a basic aqueous aluminum nitrate solution. The obtained basic aluminum nitrate aqueous solution had a specific gravity of 1.378, a viscosity of 39.2 mPa · s, a pH of 2.6, an electric conductivity of 28.0 mS / cm, an Al 2 O 3 concentration of 20.0% by mass, nitric acid NO 3 − The ratio of the number of moles of Al to the total number of moles of COO − of lactic acid: Al / (NO 3 − + COO − ) mole ratio = 1.00, the number of moles of COO − of lactic acid and the number of moles of NO 3 − of nitric acid ratio: COO - / NO 3 - were molar ratio = 0.5. Even when this basic aluminum nitrate aqueous solution was allowed to stand at 20 ° C. for 3 months or more, it did not show precipitates, increased viscosity, or gelation, and was stable.
得られた塩基性硝酸アルミニウム水溶液を減圧蒸留により濃縮を行ったが、Ａｌ2Ｏ3濃度２４．０質量％になった時点で激しく粘度増加したため、これ以上濃縮できなかった。 The obtained basic aluminum nitrate aqueous solution was concentrated by distillation under reduced pressure. However, when the Al 2 O 3 concentration reached 24.0% by mass, the viscosity increased drastically and could not be further concentrated.
実施例１〜７及び比較例１〜３に記載の塩基性硝酸アルミニウム水溶液を減圧蒸留によりＡｌ2Ｏ3濃度２４〜３０質量％まで濃縮し、２０℃で静置して保存時の析出物の発生状況を目視で評価した結果を表1に示す。 The basic aluminum nitrate aqueous solutions described in Examples 1 to 7 and Comparative Examples 1 to 3 were concentrated by distillation under reduced pressure to an Al 2 O 3 concentration of 24 to 30% by mass, and allowed to stand at 20 ° C. Table 1 shows the results of visual evaluation of the occurrence.
本発明の保存安定性の優れた塩基性硝酸アルミニウム水溶液は、セラミックバインダー、触媒原料、顔料や充填剤などの表面改質剤、アルミナゾルやアルミナの製造原料或いはアルミナゾルの粘度調整剤など種々の分野に利用される。 The basic aluminum nitrate aqueous solution having excellent storage stability of the present invention is used in various fields such as ceramic binders, catalyst raw materials, surface modifiers such as pigments and fillers, alumina sol and alumina raw materials, and alumina sol viscosity modifiers. Used.
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