JPH1179731A - Synthesis of spherical aluminosilicate from high-concentration solution - Google Patents

Synthesis of spherical aluminosilicate from high-concentration solution

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Publication number
JPH1179731A
JPH1179731A JP9286295A JP28629597A JPH1179731A JP H1179731 A JPH1179731 A JP H1179731A JP 9286295 A JP9286295 A JP 9286295A JP 28629597 A JP28629597 A JP 28629597A JP H1179731 A JPH1179731 A JP H1179731A
Authority
JP
Japan
Prior art keywords
soln
aluminum
silicon
aluminosilicate
spherical
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
Application number
JP9286295A
Other languages
Japanese (ja)
Other versions
JP3292865B2 (en
Inventor
Masaya Suzuki
正哉 鈴木
Shinji Watamura
信治 渡村
Masaki Maeda
雅喜 前田
Keiichi Inukai
恵一 犬飼
Fumihiko Ohashi
文彦 大橋
Yasuo Shibazaki
靖雄 芝崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
Agency of Industrial Science and Technology
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Priority to JP28629597A priority Critical patent/JP3292865B2/en
Publication of JPH1179731A publication Critical patent/JPH1179731A/en
Application granted granted Critical
Publication of JP3292865B2 publication Critical patent/JP3292865B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To synthesize aluminosilicate in a large amt. in a short time while suppressing energy consumption by mixing a silicon compd. soln. of high concn. and an aluminum compd. soln., dropping an alkali soln. into the mixture to neutralize, and separating and collecting a solid content produced at room temp. SOLUTION: A silicon compd. soln. of 10 to 500 mmol, and an aluminum compd. soln. of 10 to 100 mmol are mixed with 0.5 to 2.0 molar ratio of silicon/ aluminum, and then an alkali soln. is dropped into the mixture soln. by 0.5 to 2 mol/min rate to neutralize and to produce a solid content at room temp. The produced solid content is separated by filtering and with a centrifugal separating machine, then cleaned, and dried to obtain spherical aluminosilicate. The obtd. spherical aluminosilicate is a highly functional porous material having 1 to 10 nm particle diameter, >=70 m<2> /g specific surface area by nitrogen adsorption, and 0.5 to 2.0 silicon/aluminum ratio, and can be synthesized in a large amt. at room temp.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、高濃度の原料溶液
から低温度で球状アルミノケイ酸塩を合成する方法に関
するものであり、高い表面活性により吸着機能やイオン
交換機能に優れ、高比表面積と孔隙を利用した有害汚染
物質吸着材、脱臭材、生活環境の湿度を自律的に制御す
る湿度調節材等に応用可能な、球状アルミノケイ酸塩の
大量合成法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for synthesizing a spherical aluminosilicate at a low temperature from a high-concentration raw material solution. The present invention relates to a method for mass-synthesizing spherical aluminosilicate, which can be applied to a harmful pollutant adsorbent utilizing pores, a deodorant, a humidity regulator for autonomously controlling the humidity of a living environment, and the like.

【0002】[0002]

【従来の技術】球状アルミノケイ酸塩は、土壌中におい
て天然に存在するものであり、土壌における養分や水分
の移動および植物への供給、さらに有害な汚染物質の集
積や残留などに対して影響を与えている。球状アルミノ
ケイ酸塩は火山放出物の風化産物として土壌や軽石層中
に産することが明らかにされ、なかでも球状アルミノケ
イ酸塩からなる土壌として代表的な鹿沼土は軽石を構成
する発泡火山ガラスの相当部分が球状アルミノケイ酸塩
化したものであり、園芸用土として活用されている。
2. Description of the Related Art Spherical aluminosilicates are naturally occurring in soil, and have an effect on the transfer of nutrients and water in the soil and supply to plants, as well as on the accumulation and residue of harmful pollutants. Have given. Spherical aluminosilicate has been found to be produced in the soil and pumice layers as a weathered product of volcanic discharges. A significant portion is converted to spherical aluminosilicate, and is used as horticultural soil.

【0003】球状アルミノケイ酸塩の優れた物性は工業
的にも有用と思われる。しかし、天然の土壌から球状ア
ルミノケイ酸塩だけを分離することは困難であり、ま
た、天然土壌中の球状アルミノケイ酸塩の表面に皮膜と
して存在していると考えられる酸化鉄は、火山灰土壌お
よび風化軽石から分離した粘土画分から遊離酸化鉄を取
り除くためのDithionite−citrate−
bicarbonate処理(Mehra and J
ackson:Clays and ClayMine
rals,7,317,1960)を10回反復しても
酸化鉄を完全に取り除くことはできなかった(Yosh
inaga:Soil Science,Plant
Nutr.,12,47,1966)ことからも、天然
の土壌中から高純度の球状アルミノケイ酸塩を入手する
ことは不可能であった。
[0003] The excellent physical properties of spherical aluminosilicates are considered to be industrially useful. However, it is difficult to separate only spherical aluminosilicate from natural soil, and iron oxide, which is considered to be present as a film on the surface of spherical aluminosilicate in natural soil, is used in volcanic ash soil and weathered soil. Dithionite-citrate for removing free iron oxide from a clay fraction separated from pumice
Bicarbonate processing (Mehra and J
ackson: Clays and ClayMine
rals, 7, 317, 1960) was not able to completely remove the iron oxide even after repeating 10 times (Yoshi).
inaga: Soil Science, Plant
Nutr. , 12, 47, 1966), it was impossible to obtain a high-purity spherical aluminosilicate from natural soil.

【0004】このようなことから、高純度の球状アルミ
ノケイ酸塩を得るため、人工的に合成することが試みら
れ、2mmol以下の単量体ケイ酸化合物溶液と0.5
〜4mmolのアルミニウム化合物溶液の混合物にNa
OH/Al比が3.0となるように水酸化ナトリウムを
添加し、100℃で約5日間加熱することにより球状ア
ルミノケイ酸塩を得ていた(Wade:粘土科学,2
5,53,1985)。
[0004] In view of the above, artificial synthesis has been attempted to obtain high-purity spherical aluminosilicates.
A mixture of 44 mmol aluminum compound solution
Sodium hydroxide was added so that the OH / Al ratio became 3.0, and the mixture was heated at 100 ° C. for about 5 days to obtain a spherical aluminosilicate (Wade: Clay Science, 2
5, 53, 1985).

【0005】上述のような希薄な反応条件が選ばれた理
由としては、出発原料を平衡に近い条件で徐々に低濃度
で混合し、またpHをアルカリで徐々に中和しないと無
定形シリカや水酸化アルミニウム(ベーマイトやギブサ
イト)が先に生成してしまうと考えられたためであり、
従って、上記の条件よりも高濃度での合成は不可能であ
ると考えられた。
[0005] The reason why the above-mentioned dilute reaction conditions are selected is that the starting materials are gradually mixed at a low concentration under equilibrium conditions, and amorphous silica or amorphous silica is used unless the pH is gradually neutralized with alkali. Aluminum hydroxide (boehmite and gibbsite) was thought to be generated first,
Therefore, it was considered that synthesis at a higher concentration than the above conditions was impossible.

【0006】[0006]

【発明が解決しようとする課題】上述の如く、球状アル
ミノケイ酸塩の合成方法は開発されているが、従来の方
法は、出発原料が2〜4mmol程度の稀薄溶液からし
か合成されていないため、量的にわずかしか合成できな
いこと、副反応生成物を生じるため生成物の純度が低い
こと、比較的低温ではあるが、長時間の加熱を必要とす
ること等の問題点を残しているため、工業的に利用でき
る大量合成法としては不適当であった。
As described above, a method for synthesizing a spherical aluminosilicate has been developed. However, in the conventional method, starting materials are synthesized only from a dilute solution of about 2 to 4 mmol. Since it can be synthesized only in a small amount, the purity of the product is low due to the generation of side reaction products, but it is relatively low temperature, but it still has problems such as requiring long-time heating, It was unsuitable as an industrially available mass synthesis method.

【0007】本発明は、球状アルミノケイ酸塩を従来の
方法よりも短時間に、エネルギー消費も抑えながら、大
量に合成する方法を提供するものである。
[0007] The present invention provides a method for synthesizing a large amount of spherical aluminosilicate in a shorter time than conventional methods, while suppressing energy consumption.

【0008】[0008]

【課題を解決するための手段】上記課題を解決する本発
明は、高濃度のケイ素化合物溶液およびアルミニウム化
合物溶液を所定のケイ素/アルミニウムのモル比率にな
るように混合して調製した溶液に、アルカリ性溶液を徐
々に滴下することにより、溶液のpHを中性付近とする
ことで室温レベルの低温度で生成、析出する固形分を回
収、洗浄することにより高純度の球状アルミノケイ酸塩
を室温で合成する方法、である。
SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problems is characterized in that a solution prepared by mixing a high-concentration silicon compound solution and a high-concentration aluminum compound solution at a predetermined silicon / aluminum molar ratio is added to an alkaline solution. By gradually dropping the solution, the pH of the solution is adjusted to around neutral to generate at a low temperature of room temperature, and the precipitated solids are collected and washed to synthesize a high-purity spherical aluminosilicate at room temperature. How to do.

【0009】[0009]

【発明の実施の形態】次に、本発明についてさらに詳述
する。本発明方法では、原料としてケイ素化合物とアル
ミニウム化合物が用いられる。ケイ素源として使用され
る試剤は、モノケイ酸であればよく、具体的には、例え
ば、オルトケイ酸エチル、オルトケイ酸ナトリウム、オ
ルトケイ酸アルキル、メタケイ酸ナトリウム、無定形コ
ロイド状二酸化ケイ素(アエロジルなど)などが好適な
ものとして挙げられる。また、上記ケイ酸塩分子と結合
させるアルミニウム源としては、アルミニウムイオンで
あればよく、具体的には、例えば、塩化アルミニウムな
どのアルミニウム化合物が挙げられる。これらの原料を
適切な溶媒に溶解させ、所定の濃度の溶液を調製する。
溶媒としては、例えば、水、アルコールが挙げられる。
これらの溶液をケイ素/アルミニウムのモル比率が0.
5〜2.0になるように混合する。溶媒中のケイ素化合
物およびアルミニウム化合物の溶液の濃度は0.1〜1
000mmolであるが、好適な濃度としては10〜5
00mmolのケイ素化合物溶液と10〜1000mm
olのアルミニウム化合物溶液を混合することが好まし
い。これにより、ケイ素化合物溶液にアルミニウム化合
物を混合した後、アルカリ性溶液を滴下し、中和させる
ことにより室温で生成される固形分が目的とする球状ア
ルミノケイ酸塩である。アルカリ性溶液の滴下速度は局
所的なpH変化が小さい方が反応副生成物等の生成を抑
制できるので、できるかぎり徐々に滴下する方が好まし
いが、滴下速度を必要以上に遅くすると、反応時間が延
長され、不利である。好適な滴下速度としては分速0.
5〜2mlが望ましい。中和反応に必要なアルカリ性溶
液としては、水酸化ナトリウム、水酸化カリウム、アン
モニアなどが挙げられる。固形分を分離回収する際、反
応副生成物である塩を除去する。除去方法は特に制限さ
れないが、ろ過、遠心分離機による分離等で行うことが
できる。脱塩後、数回純水で洗浄、乾燥を行うことによ
り本発明の球状アルミノケイ酸塩が分離回収される。本
発明方法により、粒径が1〜10nmの範囲にあり、窒
素吸着による比表面積が70m2 /g以上である球状ア
ルミノケイ酸塩が合成される。
Next, the present invention will be described in more detail. In the method of the present invention, a silicon compound and an aluminum compound are used as raw materials. The reagent used as the silicon source may be monosilicic acid, and specifically, for example, ethyl orthosilicate, sodium orthosilicate, alkyl orthosilicate, sodium metasilicate, amorphous colloidal silicon dioxide (such as Aerosil) Are preferred. The aluminum source to be bonded to the silicate molecule may be any aluminum ion, and specifically includes, for example, an aluminum compound such as aluminum chloride. These materials are dissolved in an appropriate solvent to prepare a solution having a predetermined concentration.
Examples of the solvent include water and alcohol.
These solutions were prepared with a silicon / aluminum molar ratio of 0.
Mix to 5 to 2.0. The concentration of the solution of the silicon compound and the aluminum compound in the solvent is 0.1 to 1
000 mmol, but a preferred concentration is 10-5
00 mmol silicon compound solution and 10-1000 mm
ol of the aluminum compound solution is preferably mixed. Thus, after mixing the aluminum compound with the silicon compound solution, the alkaline solution is dropped and neutralized, and the solid content generated at room temperature is the desired spherical aluminosilicate. As for the dropping rate of the alkaline solution, the smaller the local pH change, the more the generation of reaction by-products and the like can be suppressed. Prolonged and disadvantageous. A suitable dropping rate is 0.1 minute / minute.
5 to 2 ml is desirable. Examples of the alkaline solution required for the neutralization reaction include sodium hydroxide, potassium hydroxide, and ammonia. When separating and collecting a solid content, a salt which is a reaction by-product is removed. The removal method is not particularly limited, but can be performed by filtration, separation by a centrifuge, or the like. After desalting, the spherical aluminosilicate of the present invention is separated and recovered by washing and drying several times with pure water. According to the method of the present invention, a spherical aluminosilicate having a particle diameter in the range of 1 to 10 nm and a specific surface area by nitrogen adsorption of 70 m 2 / g or more is synthesized.

【0010】[0010]

【実施例】次に、本発明を実施例に基づいて具体的に説
明するが、本発明は当該実施例のみに限定されるもので
はない。
Next, the present invention will be specifically described based on examples, but the present invention is not limited to only the examples.

【0011】SiO2 濃度が20mmolになるように
純水で希釈したオルトケイ酸エチル水溶液200mlを
調製した。この時、オルトケイ酸エチルが水に良く溶け
るように1時間程度超音波分散処理を行った。また、こ
れとは別に塩化アルミニウムを純水に溶解させ、80m
mol水溶液200mlを調製した。オルトケイ酸エチ
ル水溶液に塩化アルミニウム水溶液を混合し、マグネテ
ィックスターラーで撹拌した。このときのケイ素/アル
ミニウム比は0.5である。さらに水酸化ナトリウムを
純水に溶解させ、100mmol水溶液を調製し、オル
トケイ酸エチル水溶液と塩化アルミニウム水溶液の混合
溶液に、よく撹拌しながら約0.6ml/分の速度で滴
下した。溶液のpHが中性付近まで滴下した後、室温で
生成、析出してきた沈殿物を回収するため、0.1μm
孔径のミリポアフィルターによりろ過した。ろ過により
回収した生成物は、40℃の乾燥器で約1日から2日乾
燥した。
A 200 ml aqueous solution of ethyl orthosilicate diluted with pure water was prepared so that the SiO 2 concentration became 20 mmol. At this time, ultrasonic dispersion treatment was performed for about one hour so that ethyl orthosilicate was well dissolved in water. Separately, aluminum chloride was dissolved in pure water,
A 200 ml aqueous solution was prepared. An aqueous solution of aluminum chloride was mixed with the aqueous solution of ethyl orthosilicate and stirred with a magnetic stirrer. At this time, the silicon / aluminum ratio is 0.5. Further, sodium hydroxide was dissolved in pure water to prepare a 100 mmol aqueous solution, and the solution was added dropwise to a mixed solution of an ethyl orthosilicate aqueous solution and an aluminum chloride aqueous solution at a rate of about 0.6 ml / min with good stirring. After the pH of the solution was dropped to around neutral, 0.1 μm
The mixture was filtered through a millipore filter having a pore size. The product recovered by filtration was dried in a dryer at 40 ° C. for about 1 to 2 days.

【0012】以上の方法によって得られた生成物は、粉
末X線回折において2θ=7.5,26.5,40.5
°付近にブロードなビークを有し、球状アルミノケイ酸
塩特有のX線回折パターンを示した。赤外線吸収分光法
による測定からはアルミノケイ酸塩に特有な吸収のみが
観察され、球状アルミノケイ酸塩と同じスペクトルが得
られた。電子顕微鏡観察により直径が3〜5nmの球状
粒子であることが確認された。また、以上の測定結果か
ら副生成物は認められなかった。窒素吸着による比表面
積は約100m2 /g、細孔直径は約5.5nmであっ
た。
[0012] The product obtained by the above-mentioned method was 2θ = 7.5, 26.5, 40.5 in powder X-ray diffraction.
It had a broad beak around ° and showed an X-ray diffraction pattern unique to spherical aluminosilicate. From the measurement by infrared absorption spectroscopy, only absorption specific to the aluminosilicate was observed, and the same spectrum as that of the spherical aluminosilicate was obtained. Electron microscope observation confirmed that the particles were spherical particles having a diameter of 3 to 5 nm. In addition, no by-product was recognized from the above measurement results. The specific surface area by nitrogen adsorption was about 100 m 2 / g, and the pore diameter was about 5.5 nm.

【0013】[0013]

【発明の効果】以上に説明したように、本発明は、高濃
度の原料溶液から低温度で球状アルミノケイ酸塩を合成
する方法に係り、高い表面活性により吸着機能やイオン
交換機能に優れ、高比表面積と孔隙を利用した有害汚染
物質吸着材、脱臭材、生活環境の湿度を自律的に制御す
る湿度調節材等に応用可能な、球状アルミノケイ酸塩の
大量合成を可能としたものであり、従来の合成法よりも
効率よく、短時間で、かつエネルギー的にも有利に球状
アルミノケイ酸塩を供し得るものである。本発明によっ
て合成される球状アルミノケイ酸塩は、有害汚染物質吸
着材、脱臭材、自律的調湿材等として広範な産業分野で
の利用が可能である。よって、本発明は、高機能多孔質
材料の提供に寄与する技術として、業界に寄与するとこ
ろは極めて大きいものである。
As described above, the present invention relates to a method for synthesizing a spherical aluminosilicate from a high-concentration raw material solution at a low temperature. It enables large-scale synthesis of spherical aluminosilicate, which can be applied to harmful pollutant adsorbents using specific surface area and pores, deodorants, humidity regulators that autonomously control the humidity of living environment, etc. The present invention can provide a spherical aluminosilicate more efficiently, more quickly and more energy-efficiently than conventional synthesis methods. The spherical aluminosilicate synthesized according to the present invention can be used in a wide range of industrial fields as a harmful pollutant adsorbent, a deodorant, an autonomous humidity control material, and the like. Therefore, the present invention greatly contributes to the industry as a technology that contributes to the provision of a highly functional porous material.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施例で得られた生成物の赤外線吸収
分光法による測定結果を示す。
FIG. 1 shows the results of measurement of products obtained in Examples of the present invention by infrared absorption spectroscopy.

【図2】本発明の実施例で得られた生成物のX線回折パ
ターンによる測定結果を示す。
FIG. 2 shows the results of measurement by X-ray diffraction patterns of the products obtained in Examples of the present invention.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 大橋 文彦 愛知県名古屋市西区平出町169番地の2 サンドエル3C (72)発明者 芝崎 靖雄 愛知県名古屋市熱田区大宝2−4 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Fumihiko Ohashi 2 Sandel 3C at 169 Hirade-cho, Nishi-ku, Nagoya City, Aichi Prefecture (72) Inventor Yasuo Shibazaki 2-4, Daiho, Atsuta-ku, Nagoya City, Aichi Prefecture

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 高濃度の原料溶液から長時間の加熱をす
ることなく室温で球状アルミノケイ酸塩を合成する方法
であって、ケイ素化合物溶液とアルミニウム化合物溶液
を混合した後、アルカリ性溶液を滴下させ中和すること
により室温で生成される固形分を分離回収することを特
徴とする球状アルミノケイ酸塩の合成法。
1. A method of synthesizing a spherical aluminosilicate from a high-concentration raw material solution at room temperature without heating for a long time. After mixing a silicon compound solution and an aluminum compound solution, an alkaline solution is dropped. A method for synthesizing a spherical aluminosilicate, comprising separating and recovering a solid produced at room temperature by neutralization.
【請求項2】 10〜500mmolのケイ素化合物溶
液と10〜1000mmolのアルミニウム化合物溶液
を混合する請求項1記載の球状アルミノケイ酸塩の合成
法。
2. The method for synthesizing a spherical aluminosilicate according to claim 1, wherein 10 to 500 mmol of the silicon compound solution and 10 to 1000 mmol of the aluminum compound solution are mixed.
【請求項3】 球状アルミノケイ酸塩の粒径が1〜10
nmの範囲にあり、窒素吸着による比表面積が70m2
/g以上であり、ケイ素/アルミニウムのモル比率が
0.5〜2.0である請求項1記載の球状アルミノケイ
酸塩の合成法。
3. The particle size of the spherical aluminosilicate is 1 to 10
and the specific surface area by nitrogen adsorption is 70 m 2.
2. The method for synthesizing a spherical aluminosilicate according to claim 1, wherein the molar ratio of silicon / aluminum is 0.5 to 2.0 or more.
JP28629597A 1997-09-04 1997-09-04 Synthesis of spherical aluminosilicate from highly concentrated solution Expired - Lifetime JP3292865B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28629597A JP3292865B2 (en) 1997-09-04 1997-09-04 Synthesis of spherical aluminosilicate from highly concentrated solution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28629597A JP3292865B2 (en) 1997-09-04 1997-09-04 Synthesis of spherical aluminosilicate from highly concentrated solution

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US6799242B1 (en) 1999-03-05 2004-09-28 Sanyo Electric Co., Ltd. Optical disc player with sleep mode

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6799242B1 (en) 1999-03-05 2004-09-28 Sanyo Electric Co., Ltd. Optical disc player with sleep mode

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