JPH0345512A - Production of zeolite from fly ash - Google Patents
Production of zeolite from fly ashInfo
- Publication number
- JPH0345512A JPH0345512A JP18080389A JP18080389A JPH0345512A JP H0345512 A JPH0345512 A JP H0345512A JP 18080389 A JP18080389 A JP 18080389A JP 18080389 A JP18080389 A JP 18080389A JP H0345512 A JPH0345512 A JP H0345512A
- Authority
- JP
- Japan
- Prior art keywords
- zeolite
- aqueous solution
- naoh
- fly ash
- ion concentration
- 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.)
- Pending
Links
- 229910021536 Zeolite Inorganic materials 0.000 title claims abstract description 38
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000010457 zeolite Substances 0.000 title claims abstract description 38
- 239000010881 fly ash Substances 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 75
- 239000007864 aqueous solution Substances 0.000 claims abstract description 25
- -1 silicate ion Chemical class 0.000 claims abstract description 23
- 208000005156 Dehydration Diseases 0.000 claims abstract description 8
- 230000018044 dehydration Effects 0.000 claims abstract description 8
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims abstract description 6
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 5
- 229910001425 magnesium ion Inorganic materials 0.000 claims abstract description 5
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 4
- 238000010335 hydrothermal treatment Methods 0.000 claims description 8
- 239000002002 slurry Substances 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 9
- 238000003786 synthesis reaction Methods 0.000 description 8
- 230000037429 base substitution Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- JBJWASZNUJCEKT-UHFFFAOYSA-M sodium;hydroxide;hydrate Chemical class O.[OH-].[Na+] JBJWASZNUJCEKT-UHFFFAOYSA-M 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
Landscapes
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
Description
【発明の詳細な説明】
（ａ業上の利用分野）
本発明はフライアッシュからのゼオライト製造方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (A field of industrial application) The present invention relates to a method for producing zeolite from fly ash.
（従来の技術と発明が解決しようとする課題）フライア
ッシュとＮａＯＨ水溶液を混合し、水熱処理してゼオラ
イトを合成することが知られている。このような合成方
法においては、水熱処理後のゼオライトはスラリー状で
あり、従って脱水処理を施すものであり、脱水処理した
ＮａＯＨ水ｉｓ ？Ｆｔは、新たなフライアッシュとｌ
見合し、水熱処理を施しゼオライト合成して再利用によ
り、コスト低減等をはかる必要がある。(Prior Art and Problems to be Solved by the Invention) It is known to mix fly ash and an aqueous NaOH solution and subject the mixture to hydrothermal treatment to synthesize zeolite. In such a synthesis method, the zeolite after hydrothermal treatment is in the form of a slurry and is therefore subjected to dehydration treatment, and the dehydrated NaOH water is? Ft is new fly ash and l
However, it is necessary to reduce costs by performing hydrothermal treatment, synthesizing zeolite, and reusing it.
しかして、脱水処理されたＮａ０ｔ（水溶７夜を循環使
用すると、フライアッシュ中のシリカの１部がシリケー
トイオンとしてＮａＯＨ水溶液中に溶解し、序々に多く
なり濃縮することになる。Therefore, when dehydrated Na0t (aqueous solution) is used repeatedly, a part of the silica in the fly ash will be dissolved in the NaOH aqueous solution as silicate ions, and the amount will gradually increase and become concentrated.
このようにシリケートイオンか濃縮すると、アルカリ性
を弱めることになり、それだけＮａＯＨを多く必要とし
ＮａＯＨ原単位が低下することになり、コスト的に不利
である。When silicate ions are concentrated in this way, the alkalinity is weakened, and a correspondingly large amount of NaOH is required, resulting in a decrease in the NaOH basic unit, which is disadvantageous in terms of cost.
従って、ＮａＯＨ水溶液の循環使用（再利用）に際して
は、水溶液中のシリケートイオン濃縮を防止することが
最も重要なことである。Therefore, when recycling the NaOH aqueous solution, it is most important to prevent silicate ion concentration in the aqueous solution.
本発明はこのようなＮａＯＨ水溶液中のシリケートイオ
ンの濃縮を確実に防止し、再利用によるゼオライト合成
を向上せしめようとするものである。The present invention aims to reliably prevent such concentration of silicate ions in the NaOH aqueous solution and improve zeolite synthesis through reuse.
［課題を解決するための手段］
本発明は上述の課題を有利に解決したものであり、その
特徴とするところは、フライアッシュとＮａＯＨ水溶液
を混合し、水熱処理して、ゼオライト合成後脱水処理に
よりＮａＯＨ水溶液を分離してゼオライトを製造するに
際し、上記脱水処理後のＮａ０）Ｉ水溶液のシリケート
イオン濃度を調整し、フライアッシュを混合して水熱処
理することを特徴とする、フライアッシュからゼオライ
ト製造方法である。[Means for Solving the Problems] The present invention advantageously solves the above-mentioned problems, and is characterized by mixing fly ash and an aqueous NaOH solution, hydrothermally treating the mixture, and dehydrating the mixture after zeolite synthesis. When producing zeolite by separating the NaOH aqueous solution, the silicate ion concentration of the Na0)I aqueous solution after the dehydration treatment is adjusted, and fly ash is mixed and hydrothermally treated. It's a method.
シリケートイオンがＣａｂ、 ＭｇＯ等と接触すると以
下の反応が起る。When silicate ions come into contact with Cab, MgO, etc., the following reaction occurs.
１） ＣａＯ＋ ｓｉｎ ０２ｎ＋２”−Ｃ−５−Ｈ，
或いはゲル状１ｎ２
２） ＭｇＯ＋ Ｓｉｎ ０２ｎ＊２−’ ＭｇＯ
−５ｉ０２−Ｈ２Ｏ，或いはゲル状５ｉｎ２
このような反応によりＮａＯＨ水溶液中のシリケートイ
オンを排出し、シリケートイオンの濃縮を防止するもの
であるが、このような反応によりＮａ０）！水溶液中の
アルカリ度の低下も防止でき、ゼオライト合成上有利で
ある。1) CaO+ sin 02n+2”-C-5-H,
Or gel-like 1n2 2) MgO+ Sin 02n*2-' MgO
-5i02-H2O, or gel-like 5in2 This reaction discharges the silicate ions in the NaOH aqueous solution and prevents the silicate ions from concentrating. It is also possible to prevent a decrease in alkalinity in the aqueous solution, which is advantageous for zeolite synthesis.
一方ＮａＯＨ水１ｇ液中ヘシリケートイオンを添加する
と、ゼオライトの生成が促進する領域のあることも明ら
かになった。On the other hand, it was also revealed that there is a region where the addition of hesilicate ions to 1 g of NaOH water promotes the formation of zeolite.
即ち、ＮａＯＨ水溶液を再利用（循環使用）するに際し
、水溶液中のシリケートイオン濃度の濃縮を防止すると
ともにゼオライト合成に最適なシリ−トイオン濃度に調
整することが重要であり、本発明者等が種々検討した結
果、ＮａＯＨ水溶？夜中のシリケートイオン濃度が同−
Ｎａイオン濃度において、Ｓｔ換算量で５〜１５ ｇ／
ｊ２の範囲がゼオライト合成に最適であることを見出
した。つまり、５ｇ／Ｉ１未満ではシリケートイオン不
足によりゼオライトが合成されにくくなり、又１５ｇ／
ＪＺ超になるとアルカリ度が低下し同様にゼオライト合
成が難しくなる。That is, when reusing (circulating) an NaOH aqueous solution, it is important to prevent the silicate ion concentration in the aqueous solution from concentrating and to adjust the silicate ion concentration to the optimum level for zeolite synthesis. As a result of consideration, is it NaOH water soluble? The concentration of silicate ions during the night is the same.
Na ion concentration is 5 to 15 g/St equivalent amount.
It has been found that the range of j2 is optimal for zeolite synthesis. In other words, if it is less than 5g/I1, zeolite will be difficult to synthesize due to the lack of silicate ions, and if it is less than 15g/I1, it will be difficult to synthesize zeolite.
When the temperature exceeds JZ, the alkalinity decreases and zeolite synthesis becomes difficult.
次にＮａＯＨ水溶液中のシリケートイオン濃度を調整す
るために添加するＣａイオンとしては、例えばＣａイオ
ン含有水、ＣａＯスラリー等があり、又Ｍｇイオンとし
ては、例えばＭｇイオン含有水、ＭｇＯスラリー等があ
る。Next, examples of Ca ions added to adjust the silicate ion concentration in the NaOH aqueous solution include Ca ion-containing water, CaO slurry, etc., and examples of Mg ions that are added to adjust the silicate ion concentration include Mg ion-containing water, MgO slurry, etc. .
このようなイオンの添加方法としては、例えばＮａＯＨ
水溶液の循環使用の場合は、補給水として添加する。又
水熱処理後のゼオライト脱水前に添加する。更にその他
律環系の任意の個所から添加することができる。As a method of adding such ions, for example, NaOH
When using an aqueous solution in circulation, add it as make-up water. It is also added before zeolite dehydration after hydrothermal treatment. Furthermore, it can be added at any other point in the ring system.
（実 施 例） 次に本発明の実施例を比較例とともに挙げる。(Example) Next, examples of the present invention will be listed together with comparative examples.
このようなフライアッシュを下記のごとくゼオライト合
成した。Such fly ash was synthesized into zeolite as follows.
注：前記フライアッシュ１４ｋｇと上記ＮａＯＨ水溶液
３０Ｊｌを混合し、 １００℃にて、１時間、２時間、
３時間、４時間、５時間の水熱処理を施し、ゼオライト
合成し、ゼオライトの塩基置換容ｆｆ１（下表数字）を
測定した。Note: 14 kg of the above fly ash and 30 Jl of the above NaOH aqueous solution were mixed and heated at 100°C for 1 hour and 2 hours.
Hydrothermal treatment was performed for 3 hours, 4 hours, and 5 hours to synthesize zeolite, and the base substitution capacity ff1 (numbers in the table below) of the zeolite was measured.
注；塩基置換容量の単位はｍｅｑ７１００ｇ。Note: The unit of base substitution capacity is meq7100g.
このように本発明範囲のごときシリケートイオン濃度の
Ｎ ａ Ｏｔ＋水溶液によるゼオライト合成においては
、塩基置換容量が高くゼオライト効率がよい。As described above, in zeolite synthesis using an NaOt+ aqueous solution having a silicate ion concentration within the range of the present invention, the base substitution capacity is high and the zeolite efficiency is high.
次に上記のこと＜、ＮａＯＨ水溶液を循環使用してゼオ
ライト合威し、水ｍ？夜中のシリケートイオン濃度が上
昇した場合のシリケートイオン濃度調整方法の実施例を
挙げる。Next, as described above, the zeolite is combined by circulating the NaOH aqueous solution, and the water m? An example of a method for adjusting the silicate ion concentration when the silicate ion concentration increases during the night will be described.
上記のごとく、イオン添加剤により、シリケートイオン
濃度を調整したＮａ０）Ｉ水溶液３０ｆｔと、前記のご
ときフライアッシュ１４ｋｇとを（昆合し、上記のごと
く水熱処理（１００℃×１時間）によりゼオライト合成
し、ゼオライトの塩基置換容量（上表数字）を測定した
。As mentioned above, 30 ft of Na0)I aqueous solution whose silicate ion concentration was adjusted with ionic additives was combined with 14 kg of fly ash as described above, and zeolite was synthesized by hydrothermal treatment (100°C x 1 hour) as described above. Then, the base substitution capacity (numbers in the table above) of the zeolite was measured.
注：塩基置換容量の単位はｍｅｑ７１００ｇ。Note: The unit of base substitution capacity is meq7100g.
（発明の効果）
かくすることにより、ゼオライト合成に際し、ＮａＯＨ
水溶７夜の再利用（循環使用）が確実にでき、コストを
著しく低下させることができる。(Effect of the invention) By doing so, when synthesizing zeolite, NaOH
The aqueous solution can be reused (circulated) for 7 days without fail, and costs can be significantly reduced.
又、ゼオライトの品質を向上させることができ、ゼオラ
イト合成の対フライアッシュ歩留を向上させることがで
きる等の優れた効果が得られる。Further, excellent effects such as being able to improve the quality of zeolite and improving the yield of fly ash in zeolite synthesis can be obtained.
他４名4 others
Claims (1)
理して、ゼオライト合成後脱水処理によりＮａＯＨ水溶
液を分離してゼオライトを製造するに際し、上記脱水処
理後のＮａＯＨ水溶液のシリケートイオン濃度を調整し
、フライアッシュを混合して再度水熱処理することを特
徴とする、フライアッシュからのゼオライト製造方法。 ２ Ｃａイオン、ＭｇイオンをＮａＯＨ水溶液に添加し
、シリケートイオン濃度を調整することを特徴とする、
請求項１に記載のフライアッシュからのゼオライト製造
方法。 ３ ＮａＯＨ水溶液中のシリケートイオン濃度をＳｉ換
算量で５〜１５ｇ／ｌに調整することを特徴とする請求
項１または２に記載のフライアッシュからのゼオライト
製造方法。[Claims] 1. When producing zeolite by mixing fly ash and an aqueous NaOH solution and subjecting them to hydrothermal treatment to separate the aqueous NaOH solution by dehydration treatment after synthesizing zeolite, the silicate ion concentration of the aqueous NaOH solution after the dehydration treatment is A method for producing zeolite from fly ash, which comprises adjusting the zeolite, mixing fly ash, and subjecting it to hydrothermal treatment again. 2. Adding Ca ions and Mg ions to the NaOH aqueous solution to adjust the silicate ion concentration,
The method for producing zeolite from fly ash according to claim 1. 3. The method for producing zeolite from fly ash according to claim 1 or 2, characterized in that the silicate ion concentration in the NaOH aqueous solution is adjusted to 5 to 15 g/l in terms of Si.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18080389A JPH0345512A (en) | 1989-07-13 | 1989-07-13 | Production of zeolite from fly ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18080389A JPH0345512A (en) | 1989-07-13 | 1989-07-13 | Production of zeolite from fly ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0345512A true JPH0345512A (en) | 1991-02-27 |
Family
ID=16089619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18080389A Pending JPH0345512A (en) | 1989-07-13 | 1989-07-13 | Production of zeolite from fly ash |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0345512A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1004729C2 (en) * | 1996-12-09 | 1998-06-18 | Kema Nv | Method for manufacturing zeolite from fly ash. |
| US5965105A (en) * | 1998-06-12 | 1999-10-12 | Council Of Scientific And Industrial Research | Process for the synthesis of flyash based Zeolite-A |
| US6299854B1 (en) | 1998-06-12 | 2001-10-09 | Teruo Henmi | Method of producing artificial zeolite |
| JP2002173320A (en) * | 2000-12-06 | 2002-06-21 | Ikuhiro Ando | Synthetic method of zeolite by induction and zeolite composition |
| KR100450731B1 (en) * | 1997-08-07 | 2005-02-02 | 미우라고교 가부시키카이샤 | Adsorbent for exhaust gas treatment and its adsorption method |
-
1989
- 1989-07-13 JP JP18080389A patent/JPH0345512A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1004729C2 (en) * | 1996-12-09 | 1998-06-18 | Kema Nv | Method for manufacturing zeolite from fly ash. |
| WO1998026101A1 (en) * | 1996-12-09 | 1998-06-18 | N.V. Kema | Method for preparing zeolites from fly ash |
| KR100450731B1 (en) * | 1997-08-07 | 2005-02-02 | 미우라고교 가부시키카이샤 | Adsorbent for exhaust gas treatment and its adsorption method |
| US5965105A (en) * | 1998-06-12 | 1999-10-12 | Council Of Scientific And Industrial Research | Process for the synthesis of flyash based Zeolite-A |
| US6299854B1 (en) | 1998-06-12 | 2001-10-09 | Teruo Henmi | Method of producing artificial zeolite |
| JP2002173320A (en) * | 2000-12-06 | 2002-06-21 | Ikuhiro Ando | Synthetic method of zeolite by induction and zeolite composition |
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