JP2009227484A - Method for producing lithium-type zeolite - Google Patents

Method for producing lithium-type zeolite Download PDF

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JP2009227484A
JP2009227484A JP2008072014A JP2008072014A JP2009227484A JP 2009227484 A JP2009227484 A JP 2009227484A JP 2008072014 A JP2008072014 A JP 2008072014A JP 2008072014 A JP2008072014 A JP 2008072014A JP 2009227484 A JP2009227484 A JP 2009227484A
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lithium
zeolite
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type zeolite
aqueous solution
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JP5594710B2 (en
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Kiyoshi Mizuno
清 水野
Motoki Uehara
元樹 上原
Taiji Matsumoto
泰治 松本
Yoshiaki Goto
義昭 後藤
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Tochigi Prefecture
Railway Technical Research Institute
Ryukoku University
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Railway Technical Research Institute
Ryukoku University
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a lithium-type zeolite by which the lithium-type zeolite can be produced at a synthesis temperature in a range of 20-50°C, in such a very low lithium hydroxide, that is, alkali concentration as 1 M (1 mol) and in a short synthesis time. <P>SOLUTION: The method for producing the lithium-type zeolite comprises adding an aqueous lithium hydroxide solution to metakaolin obtained by firing and activating kaolinite which is a natural clay mineral, and bringing those into a reaction at a low temperature of 20-50°C, whereby the lithium-type zeolite is produced in a low alkali concentration and in a short synthesis time. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、天然カオリナイトを焼成したメタカリオンを使用した、リチウム型ゼオライトの製造方法に係り、特に、アルカリ骨材反応を抑制するコンクリート材料に適するリチウム型ゼオライトの製造方法に関するものである。   The present invention relates to a method for producing a lithium type zeolite using metakalion obtained by calcining natural kaolinite, and more particularly to a method for producing a lithium type zeolite suitable for a concrete material that suppresses alkali aggregate reaction.

アルカリ骨材反応とは、コンクリート中の骨材の特定の鉱物とアルカリ性細孔溶液との間の化学反応によって、局部的な容積膨張が生じ、コンクリートにひび割れを生じさせるとともに、強度低下あるいは弾性の低下という物性の変化が生じる現象であり、道路・橋梁・トンネル・ビル等のコンクリート構造物の崩壊をもたらすことから社会的な問題となっている。この対策として、リチウム型ゼオライトがアルカリ骨材反応抑制に有効なことが報告されている。   Alkali-aggregate reaction refers to local volume expansion caused by a chemical reaction between a specific mineral of aggregate in the concrete and the alkaline pore solution, causing cracks in the concrete and reducing strength or elasticity. This is a phenomenon that causes a change in physical properties, such as a decline, and it is a social problem because it causes the collapse of concrete structures such as roads, bridges, tunnels, and buildings. As a countermeasure, it has been reported that lithium-type zeolite is effective in suppressing alkali-aggregate reaction.

かかるリチウム型ゼオライトはこれまでに、ＡＢＷゼオライトやＥＤＩゼオライトなどの合成が報告されている（下記非特許文献１〜４参照）が、これらを製造するためには、アルミナゾル、シリカゾル、水酸化リチウムから調製したゲル、あるいは天然の粘土鉱物であるカオリナイトを焼成し活性化したメタカオリンあるいは天然粘土鉱物であるアロフェンに水酸化リチウム水溶液を加え、６０℃〜２００℃程度の高温条件下で合成された。あるいは、リチウム以外の金属を含むゼオライト（例えば、ナトリウム型ゼオライトＡ）を塩化リチウムなどのリチウム塩溶液中でイオン交換処理を数回繰り返した後、塩化物イオンを洗浄することにより製造されていた（下記特許文献１参照）。
特開平１１−２２６４２９号 「アルミナゾル、シリカゾル、水酸化リチウムからのリチウム型ＥＤＩゼオライトの合成方法」，Ｔ．Ｍａｔｓｕｍｏｔｏ，Ｔ．Ｍｉｙａｚａｋｉ，ａｎｄ Ｙ．Ｇｏｔｏ：Ｊ．Ｅｕｒ．Ｃｅｒａｍ．Ｓｏｃ．, ２６，４５５−４５８，（２００６） 「メタカオリンからのＬｉ型ＡＢＷゼオライトの合成方法」，Ｒ．Ｂａｒｒｅｒ，ａｎｄ Ｄ．Ｅ．Ｍａｉｎｗａｒｉｎｇ：Ｊ．Ｃｈｅｍ．Ｓｏｃ．Ｄａｌｔｏｎ．，１９７２，２５３４−２５４６，（１９７２） 「カオリナイトからのＬｉ型ＡＢＷゼオライトの合成方法」，Ａ．Ａ．Ｋｏｓｏｒｕｋｏｖ，Ｌ．Ｇ．Ｎａｄｅｌ，ａｎｄ Ａ．Ｓ．Ｃｈｉｒｋｏｖ，Ｒｕｓｓｉａｎ Ｊ．ｌｎｏｒｇ．Ｃｈｅｍ. ，３１，５０３，（１９８６） 「アロフェンからのリチウム型ＡＢＷゼオライトとリチウム型ＥＤＩゼオライトの合成方法」，興野雄亮、吉葉光雄、星佳宏、磯文夫，渡辺雄二郎、小松優、守吉佑介、無機マテリアル学会第１１２回学術講演会要旨集、ｐ．８−９、（２００６） So far, such lithium-type zeolite has been reported to be synthesized such as ABW zeolite and EDI zeolite (see Non-Patent Documents 1 to 4 below). In order to produce these, alumina sol, silica sol, lithium hydroxide is used. A lithium hydroxide aqueous solution was added to the prepared gel or metakaolin obtained by calcination and activation of kaolinite, which is a natural clay mineral, or allophane, which was a natural clay mineral, and synthesized under a high temperature condition of about 60 ° C to 200 ° C. Alternatively, a zeolite containing a metal other than lithium (for example, sodium-type zeolite A) was produced by repeating ion exchange treatment several times in a lithium salt solution such as lithium chloride and then washing chloride ions ( See Patent Document 1 below).
JP-A-11-226429 “Method for synthesizing lithium-type EDI zeolite from alumina sol, silica sol and lithium hydroxide”, T.W. Matsumoto, T .; Miyazaki, and Y.M. Goto: J.M. Eur. Ceram. Soc. , 26, 455-458, (2006) “Synthesis of Li-type ABW zeolite from metakaolin”, R.A. Barrer, and D.B. E. Mainwaring: J.M. Chem. Soc. Dalton. , 1972, 2534-2546, (1972) “Synthesis of Li-type ABW zeolite from kaolinite”, A. A. Kosorukov, L.M. G. Nadel, and A.M. S. Kirkov, Russian J. et al. lorg. Chem., 31, 503, (1986) "Synthesis of Lithium-type ABW Zeolite and Lithium-Type EDI Zeolite from Allophane", Yusuke Okino, Mitsuo Yoshiba, Yoshihiro Hoshi, Fumio Tsuji, Yujiro Watanabe, Yu Komatsu, Yusuke Moriyoshi, Abstracts of the 112th Annual Meeting of the Society of Inorganic Materials Shu, p. 8-9, (2006)

しかしながら、従来のリチウム型ゼオライトの製造方法は、合成法においては高温条件下にすることが必要であり、イオン交換法においてはイオン交換操作の回数が多いため、コストが高いという問題があった。   However, the conventional method for producing lithium zeolite requires a high temperature condition in the synthesis method, and in the ion exchange method, the number of ion exchange operations is large.

また、リチウム型に限らず、ゼオライトの合成温度は８０℃以上の報告が殆どであり、２０℃〜５０℃でのゼオライトの合成例は数少なく、それも極めて高いアルカリ濃度が必要か、あるいは合成時間が数カ月かち数年という極めて長くかかることから、工業的には現実的でないとされていた。   Moreover, not only the lithium type, the synthesis temperature of zeolite is mostly reported to be 80 ° C. or higher, and there are few examples of zeolite synthesis at 20 ° C. to 50 ° C., which also requires a very high alkali concentration, or the synthesis time. However, it took a very long time of several months to several years, so it was considered unrealistic industrially.

本発明は、上記状況に鑑みて、合成温度が２０℃〜５０℃の範囲で、しかも水酸化リチウムのアルカリ濃度が１Ｍ（１モル）と極めて希薄な濃度であり、短い合成時間で製造することができるリチウム型ゼオライトの製造方法を提供することを目的とする。   In view of the above situation, the present invention is manufactured in a short synthesis time with a synthesis temperature in the range of 20 ° C. to 50 ° C. and an alkali concentration of lithium hydroxide of 1M (1 mol). An object of the present invention is to provide a method for producing a lithium-type zeolite that can be used.

本発明は、上記目的を達成するために、
〔１〕リチウム型ゼオライトの製造方法において、天然の粘土鉱物であるカオリナイトを焼成し活性化したメタカオリンに水酸化リチウム水溶液を加え、２０℃〜５０℃の低温下の反応によって、アルカリ濃度が低く、しかも短い合成時間でリチウム型ゼオライトを製造することを特徴とする。 In order to achieve the above object, the present invention provides
[1] In a method for producing lithium zeolite, an aqueous lithium hydroxide solution is added to metakaolin obtained by calcining and activating kaolinite, a natural clay mineral, and the alkali concentration is lowered by a reaction at a low temperature of 20 ° C to 50 ° C. Moreover, it is characterized in that lithium zeolite is produced in a short synthesis time.

〔２〕上記〔１〕記載のリチウム型ゼオライトの製造方法において、前記メタカオリン１に対して、１０倍量の１Ｍ（モル）水酸化リチウム水溶液を加えることを特徴とする。   [2] The method for producing a lithium zeolite according to [1] above, wherein 10 times the amount of 1M (mol) lithium hydroxide aqueous solution is added to the metakaolin 1.

〔３〕上記〔１〕又は〔２〕記載のリチウム型ゼオライトの製造方法において、前記水酸化リチウム水溶液を２０℃〜５０℃に調整した雰囲気中で２４時間から１２０時間保持することを特徴とする。   [3] The method for producing a lithium zeolite according to [1] or [2], wherein the lithium hydroxide aqueous solution is maintained in an atmosphere adjusted to 20 ° C. to 50 ° C. for 24 hours to 120 hours. .

〔４〕上記〔１〕、〔２〕又は〔３〕記載のリチウム型ゼオライトの製造方法において、前記メタカオリン１に対して１０倍量の１Ｍ（モル）水酸化リチウム水溶液を加え、密閉容器に入れ、この密閉容器を２０℃〜５０℃に調整した雰囲気中で２４時間から１２０時間保持し、該保持時間が経過した後、得られた沈殿物を常温でろ過・洗浄・乾燥し、白色粉末からなるリチウム型ゼオライトを得ることを特徴とする。   [4] In the method for producing a lithium-type zeolite described in [1], [2] or [3] above, 10 times the amount of 1M (mol) lithium hydroxide aqueous solution is added to the metakaolin 1, and the mixture is placed in a sealed container. The sealed container is held in an atmosphere adjusted to 20 ° C. to 50 ° C. for 24 to 120 hours, and after the holding time has elapsed, the resulting precipitate is filtered, washed and dried at room temperature to obtain a white powder. A lithium type zeolite is obtained.

本発明によれば、次のような効果を奏することができる。   According to the present invention, the following effects can be achieved.

（１）２０℃〜５０℃という極めて低温でリチウム型ゼオライトが合成できる。   (1) Lithium-type zeolite can be synthesized at an extremely low temperature of 20 ° C to 50 ° C.

（２）メタカオリンは安価（１００〜１５０円／ｋｇ）であり、合成コストが低い。   (2) Metakaolin is inexpensive (100 to 150 yen / kg) and the synthesis cost is low.

（３）メタカオリンは鉄等の着色不純物が極めて少ないため、白色度の高い、リチウム型ゼオライトが得られる。   (3) Since metakaolin has very little colored impurities such as iron, a lithium zeolite with high whiteness can be obtained.

本発明のリチウム型ゼオライトの製造方法は、天然の粘土鉱物であるカオリナイトを焼成し活性化したメタカオリンに水酸化リチウム水溶液を加え、２０℃〜５０℃の低温下の反応によって、リチウム型ゼオライトを製造する。   According to the method for producing a lithium zeolite of the present invention, a lithium hydroxide aqueous solution is added to metakaolin obtained by calcining and activating kaolinite, which is a natural clay mineral, and a reaction at a low temperature of 20 ° C. to 50 ° C. To manufacture.

以下、本発明の実施の形態について詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail.

本発明のリチウム型ゼオライトの製造方法は、天然の粘土鉱物であるカオリナイトを焼成し活性化したメタカオリンに水酸化リチウム水溶液を加え、２０℃〜５０℃の低温下の反応によって、リチウム型ゼオライトを製造する。   According to the method for producing a lithium zeolite of the present invention, a lithium hydroxide aqueous solution is added to metakaolin obtained by calcining and activating kaolinite, which is a natural clay mineral, and a reaction at a low temperature of 20 ° C. to 50 ° C. To manufacture.

図１は本発明の実施例に係るリチウム型ゼオライトの製造装置を示す図、図２は本発明の実施例のリチウム型ゼオライトの製造方法を示すフローチャートである。   FIG. 1 is a diagram showing an apparatus for producing a lithium zeolite according to an embodiment of the present invention, and FIG. 2 is a flowchart showing a method for producing a lithium zeolite according to an embodiment of the present invention.

図１において、１は密閉容器、２は密閉容器１内の沈殿物、３は電子制御装置、４は制御部、５は温度調整装置、６は計時装置、７は沈殿物２の排出口、７Ａは電磁開閉弁、８はろ過・洗浄・乾燥処理装置、８Ａは送出装置、９はろ過・洗浄・乾燥処理装置８の排出口、９はそのろ過・洗浄・乾燥処理装置８の排出口、１０は排出口９から得られた白色粉末である。   In FIG. 1, 1 is an airtight container, 2 is a deposit in the airtight container 1, 3 is an electronic control device, 4 is a control unit, 5 is a temperature adjusting device, 6 is a timing device, 7 is an outlet for the precipitate 2, 7A is an electromagnetic on-off valve, 8 is a filtration / cleaning / drying processing device, 8A is a delivery device, 9 is an outlet of the filtration / cleaning / drying processing device 8, 9 is an outlet of the filtration / cleaning / drying processing device 8, Reference numeral 10 denotes a white powder obtained from the discharge port 9.

以下、リチウム型ゼオライトの製造方法について図２に示すフローチャートを参照しながら説明する。   Hereinafter, a method for producing lithium zeolite will be described with reference to the flowchart shown in FIG.

（１）まず、天然カオリナイトを焼成したメタカオリン（モル）１に対し、１０倍量の水酸化リチウム（モル）の水溶液を、密閉容器１中で混合する（ステップＳ１）。   (1) First, 10 times the amount of lithium hydroxide (mol) aqueous solution is mixed in the closed container 1 with respect to metakaolin (mol) 1 obtained by firing natural kaolinite (step S1).

（２）この密閉容器１を温度調整装置５により２０℃〜５０℃に調整した雰囲気中で計時装置６で監視して２４時間から１２０時間保持する（ステップＳ２）。   (2) The airtight container 1 is monitored by the time measuring device 6 in an atmosphere adjusted to 20 ° C. to 50 ° C. by the temperature adjusting device 5 and held for 24 to 120 hours (step S2).

（３）再び、天然カオリナイトを焼成したメタカオリン（モル）１に対し、１０倍量の水酸化リチウム（モル）の水溶液を、密閉容器１中で混合する（ステップＳ３）。   (3) Again, an aqueous solution of 10 times the amount of lithium hydroxide (mol) is mixed in the closed container 1 with respect to metakaolin (mol) 1 obtained by firing natural kaolinite (step S3).

（４）所定の時間が経過した後、得られた沈殿物２をろ過・洗浄・乾燥処理装置８において常温でろ過・洗浄・乾燥する（ステップＳ４）。   (4) After a predetermined time has elapsed, the obtained precipitate 2 is filtered, washed and dried at room temperature in the filtration / washing / drying processing apparatus 8 (step S4).

（５）回収水酸化リチウム水溶液＋未使用水酸化リチウム水溶液を再利用する（ステップＳ５）。   (5) The recovered lithium hydroxide aqueous solution + unused lithium hydroxide aqueous solution is reused (step S5).

（６）ステップＳ４により、白色粉末１０が得られる（ステップＳ６）。   (6) The white powder 10 is obtained by step S4 (step S6).

このようにした製造された白色粉末１０を、Ｘ線回折法により回折した結果、リチウム型ゼオライト（Ｌｉ−ＥＤＩ、Ｌｉ−ＥＤＩ＋Ｌｉ−ＡＢＷ）であることを確認できた。   As a result of diffracting the produced white powder 10 by the X-ray diffraction method, it was confirmed that it was a lithium type zeolite (Li-EDI, Li-EDI + Li-ABW).

かかるリチウム型ゼオライトは、アルカリイオン捕集機能を有し、リチウムイオンの効果と相まってアルカリ骨材反応を抑制する材料（例えば、コンクリート材料）として好適である。
〔実施例１〕
メタカオリン１ｇに対し、１Ｍ（モル）の水酸化リチウム水溶液１０ｍｌを加え、テフロン（登録商標）性の密閉容器内で、３０℃、２４時間反応を行った。反応後、生成物を蒸留水で洗浄し、乾燥した。得られた生成物をＸ線回折により調べた結果、リチウム型ＥＤＩゼオライトの生成を確認した。
〔実施例２〕
メタカオリン１ｇに対し、１Ｍ（モル）の水酸化リチウム水溶液１０ｍｌを加え、テフロン（登録商標）性の密閉容器内で、５０℃、１２０時間反応を行った。反応後、生成物を蒸留水で洗浄し、乾燥した。得られた生成物をＸ線回折により調べた結果、リチウム型ＡＢＷゼオライトとリチウム型ＥＤＩゼオライトの混合物であることを確認した。 Such lithium-type zeolite has an alkali ion collecting function and is suitable as a material (for example, a concrete material) that suppresses the alkali aggregate reaction in combination with the effect of lithium ions.
[Example 1]
To 1 g of metakaolin, 10 ml of a 1M (mol) lithium hydroxide aqueous solution was added, and the reaction was performed at 30 ° C. for 24 hours in a Teflon (registered trademark) sealed container. After the reaction, the product was washed with distilled water and dried. As a result of examining the obtained product by X-ray diffraction, it was confirmed that lithium type EDI zeolite was produced.
[Example 2]
To 1 g of metakaolin, 10 ml of a 1M (mol) lithium hydroxide aqueous solution was added, and the reaction was carried out at 50 ° C. for 120 hours in a Teflon (registered trademark) sealed container. After the reaction, the product was washed with distilled water and dried. As a result of examining the obtained product by X-ray diffraction, it was confirmed that it was a mixture of lithium ABW zeolite and lithium EDI zeolite.

これまでカオリナイトもしくはメタカオリンを原料とした、リチウム型ゼオライトの合成例において、ＥＤＩゼオライトは報告されておらず、本発明において初めてリチウム型ＥＤＩゼオライトの合成に成功した。また、その合成温度は、これまで化成原料（アルミナゾル、シリカゾル）やアロフェンからのＥＤＩゼオライトの合成温度である６０〜１００℃よりも極めて低い、２０℃〜５０℃である。   So far, no EDI zeolite has been reported in the synthesis examples of lithium zeolite using kaolinite or metakaolin as a raw material, and for the first time in the present invention, lithium type EDI zeolite was successfully synthesized. The synthesis temperature is 20 ° C. to 50 ° C., which is much lower than 60 to 100 ° C., which is the synthesis temperature of EDI zeolite from chemical raw materials (alumina sol, silica sol) and allophane.

また、本発明ではリチウム型ＡＢＷゼオライトとリチウム型ＥＤＩゼオライトの混合物も得られているが、ＡＢＷゼオライトの合成温度に関しても、従来報告されている８０℃〜２００℃と比較して低い合成温度に成功している。   In the present invention, a mixture of lithium-type ABW zeolite and lithium-type EDI zeolite was also obtained, but the synthesis temperature of ABW zeolite was also successful at a low synthesis temperature compared to 80 ° C. to 200 ° C. reported conventionally. is doing.

このように、本発明によれば、天然カオリナイトを焼成したメタカオリンを使用して、これまでより安価にリチウム型ゼオライトを製造する条件を見出した。また、イオン種の異なるゼオライトを使用して煩雑なイオン交換、洗浄を繰り返す必要もない。   Thus, according to the present invention, the present inventors have found conditions for producing lithium-type zeolite at a lower cost than before by using metakaolin obtained by calcining natural kaolinite. Further, it is not necessary to repeat complicated ion exchange and washing using zeolites having different ionic species.

なお、本発明は上記実施例に限定されるものではなく、本発明の趣旨に基づいて種々の変形が可能であり、これらを本発明の範囲から排除するものではない。   In addition, this invention is not limited to the said Example, A various deformation | transformation is possible based on the meaning of this invention, and these are not excluded from the scope of the present invention.

本発明のリチウム型ゼオライトの製造方法は、安価にしかも容易にアルカリ骨材反応を抑制するコンクリート材料に適するリチウム型ゼオライトの製造を行うために利用することができる。   The method for producing a lithium-type zeolite of the present invention can be used for producing a lithium-type zeolite suitable for a concrete material that can easily inhibit the alkali-aggregate reaction at low cost.

本発明の実施例に係るリチウム型ゼオライトの製造装置を示す図である。It is a figure which shows the manufacturing apparatus of the lithium type zeolite which concerns on the Example of this invention. 本発明の実施例のリチウム型ゼオライトの製造方法を示すフローチャートである。It is a flowchart which shows the manufacturing method of the lithium type zeolite of the Example of this invention.

符号の説明Explanation of symbols

１ 密閉容器
２ 密閉容器内の沈殿物
３ 電子制御装置
４ 制御部
５ 温度調整装置
６ 計時装置
７ 沈殿物の排出口
７Ａ 電磁開閉弁
８ ろ過・洗浄・乾燥処理装置
８Ａ 送出装置
９ ろ過・洗浄・乾燥処理装置の排出口
１０ 白色粉末 DESCRIPTION OF SYMBOLS 1 Airtight container 2 Precipitate in airtight container 3 Electronic control device 4 Control part 5 Temperature control device 6 Timekeeping device 7 Precipitate discharge port 7A Electromagnetic on-off valve 8 Filtration / washing / drying processing device 8A Delivery device 9 Filtration / washing / Drying equipment discharge port 10 White powder

Claims (4)

天然の粘土鉱物であるカオリナイトを焼成し活性化したメタカオリンに水酸化リチウム水溶液を加え、２０℃〜５０℃の低温下の反応によって、アルカリ濃度が低く、しかも短い合成時間でリチウム型ゼオライトを製造することを特徴とするリチウム型ゼオライトの製造方法。   Lithium zeolite aqueous solution is produced by adding lithium hydroxide aqueous solution to metakaolin activated by calcining kaolinite, a natural clay mineral, and reacting at low temperatures of 20 ° C to 50 ° C. A method for producing a lithium-type zeolite, characterized by comprising: 請求項１記載のリチウム型ゼオライトの製造方法において、前記メタカオリン１に対して、１０倍量の１Ｍ（モル）水酸化リチウム水溶液を加えることを特徴とするリチウム型ゼオライトの製造方法。   2. The method for producing a lithium zeolite according to claim 1, wherein 10 times the amount of 1M (mol) lithium hydroxide aqueous solution is added to the metakaolin 1. 請求項１又は２記載のリチウム型ゼオライトの製造方法において、前記水酸化リチウム水溶液を２０℃〜５０℃に調整した雰囲気中で２４時間から１２０時間保持することを特徴とするリチウム型ゼオライトの製造方法。   3. The method for producing a lithium zeolite according to claim 1, wherein the lithium hydroxide aqueous solution is held in an atmosphere adjusted to 20 to 50 ° C. for 24 to 120 hours. . 請求項１、２又は３記載のリチウム型ゼオライトの製造方法において、前記メタカオリン１に対して１０倍量の１Ｍ（モル）水酸化リチウム水溶液を加え、密閉容器に入れ、該密閉容器を２０℃〜５０℃に調整した雰囲気中で２４時間から１２０時間保持し、該保持時間が経過した後、得られた沈殿物を常温でろ過・洗浄・乾燥し、白色粉末からなるリチウム型ゼオライトを得ることを特徴とするリチウム型ゼオライトの製造方法。   The method for producing a lithium-type zeolite according to claim 1, 2, or 3, wherein 10 times the amount of 1M (mol) lithium hydroxide aqueous solution is added to the metakaolin 1 and placed in a sealed container, and the sealed container is placed at 20 ° C to 20 ° C. Holding for 24 hours to 120 hours in an atmosphere adjusted to 50 ° C. After the holding time has elapsed, the obtained precipitate is filtered, washed and dried at room temperature to obtain a lithium-type zeolite made of white powder. A method for producing a lithium-type zeolite.
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CN113264538A (en) * 2021-05-29 2021-08-17 山西腾茂科技股份有限公司 Preparation method and application of molecular sieve adsorbent based on LiNaKLSX

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CN113264538A (en) * 2021-05-29 2021-08-17 山西腾茂科技股份有限公司 Preparation method and application of molecular sieve adsorbent based on LiNaKLSX

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