JPH09253658A - Method for treating waste water containing concentrated phosphoric acid - Google Patents
Method for treating waste water containing concentrated phosphoric acidInfo
- Publication number
- JPH09253658A JPH09253658A JP7206096A JP7206096A JPH09253658A JP H09253658 A JPH09253658 A JP H09253658A JP 7206096 A JP7206096 A JP 7206096A JP 7206096 A JP7206096 A JP 7206096A JP H09253658 A JPH09253658 A JP H09253658A
- Authority
- JP
- Japan
- Prior art keywords
- phosphoric acid
- concentrated phosphoric
- waste water
- tank
- separated
- 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
Links
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、濃厚リン酸含有排
水の処理方法に関し、特に、少ない薬品添加量で排水中
のリンを効率よく回収し且つ二次利用できるようにした
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating wastewater containing concentrated phosphoric acid, and more particularly to a method for efficiently recovering phosphorus and secondarily utilizing phosphorus in wastewater with a small amount of chemical addition.
【０００２】[0002]
【従来の技術】例えば、半導体製造工場における窒化膜
のエッチング処理工程等で排水される排水は、リン酸が
１〜５０％含有され、ｐＨが１〜２と高い。従来、高濃
度のリンを含有する排水は、主に、水酸化カルシウム
（消石灰）などのカルシウム含有化合物を用いた凝集沈
殿法により処理されてきた。例えば、特公昭５３−４３
７４３号公報には、フッ素をカルシウムイオン、リン酸
イオンとｐＨ３．５〜７で反応させてフッ素を不溶化物
として分離した後のリン含有処理水の処理として、当該
処理水をｐＨ９以上に調整することによりリン酸を不溶
化物として除去する方法が開示されている。2. Description of the Related Art For example, wastewater discharged in a nitride film etching process in a semiconductor manufacturing factory contains phosphoric acid in an amount of 1 to 50% and has a high pH of 1 to 2. Conventionally, wastewater containing a high concentration of phosphorus has been mainly treated by a coagulation-sedimentation method using a calcium-containing compound such as calcium hydroxide (slaked lime). For example, Japanese Patent Publication No. 53-43
No. 743 discloses that the treated water is adjusted to pH 9 or higher as the treatment of phosphorus-containing treated water after the fluorine is reacted with calcium ions and phosphate ions at pH 3.5 to 7 to separate fluorine as an insoluble matter. Thus, a method of removing phosphoric acid as an insoluble substance is disclosed.
【０００３】このときの反応式は以下のとおりである。The reaction formula at this time is as follows.
【０００４】 ３Ｃａ2+ ＋ ２Ｈ3ＰＯ4 → Ｃａ3（ＰＯ4）2↓ （１）3Ca 2+ + 2H 3 PO 4 → Ca 3 (PO 4 ) 2 ↓ (1)
【０００５】[0005]
【発明が解決しようとする課題】上述したように消石灰
を添加することによりリン濃度を十分な濃度まで低減す
るためにはかなり過剰の消石灰を添加する必要があり、
通常、５ｍｇ−Ｐ／ｌ以下にするためには、化学量論量
の２〜２．５倍の消石灰を添加してｐＨを１０〜１１程
度にする必要があった。また、このように消石灰を過剰
に添加すると、沈殿物の沈降性、濃縮性が乏しいので、
その後の処理液の取り扱いが困難であるという難点もあ
った。As described above, in order to reduce the phosphorus concentration to a sufficient concentration by adding slaked lime, it is necessary to add a considerably excessive amount of slaked lime.
Usually, in order to achieve 5 mg-P / l or less, it was necessary to add slaked lime in an amount of 2 to 2.5 times the stoichiometric amount to adjust the pH to about 10 to 11. In addition, if slaked lime is added excessively in this way, the sedimentation and concentration of the precipitate are poor, so
There is also a drawback that it is difficult to handle the treatment liquid thereafter.
【０００６】本発明は、このような事情に鑑み、低減し
た添加薬剤で排水中のリン酸を二次利用できる形態で効
率よく回収することができる濃厚リン酸含有排水の処理
方法を提供することを目的とする。In view of such circumstances, the present invention provides a method for treating concentrated phosphoric acid-containing wastewater, which can efficiently recover phosphoric acid in wastewater in a form that can be secondarily used with a reduced additive agent. With the goal.
【０００７】[0007]
【課題を解決するための手段】前記目的を達成する本発
明は、濃厚リン酸含有処理排水を、ｐＨ５〜７の条件で
水酸化カルシウムと反応させてリン酸一水素カルシウム
を生成し、これを不溶性物として分離する第１の工程
と、この第１の工程の処理液をｐＨ９〜１１の条件で水
酸化カルシウムと反応させて生成した不溶性物を分離す
る第２の工程と、この第２の工程で分離した不溶性物を
前記第１の工程で処理する前記濃厚リン酸含有排水に溶
解させる第３の工程とを有することを特徴とする濃厚リ
ン酸含有排水の処理方法にある。Means for Solving the Problems In the present invention which achieves the above object, concentrated phosphoric acid-containing treated wastewater is reacted with calcium hydroxide under conditions of pH 5 to 7 to produce calcium monohydrogen phosphate, which is A first step of separating as an insoluble matter, a second step of reacting the treatment liquid of the first step with calcium hydroxide under conditions of pH 9 to 11 to separate an insoluble matter produced, and a second step of And a third step of dissolving the insoluble matter separated in the step in the concentrated phosphoric acid-containing wastewater treated in the first step.
【０００８】ここで、前記第１の工程での水酸化カルシ
ウムの添加量は、例えば、前記濃厚リン酸含有処理水に
含有されるリン酸のＰ当量に対して、Ｃａ当量がほぼ同
一となるようにする。Here, the Ca equivalent of the calcium hydroxide added in the first step is substantially the same as the P equivalent of the phosphoric acid contained in the concentrated phosphoric acid-containing treated water. To do so.
【０００９】また、前記第２の工程での水酸化カルシウ
ムの添加量は、例えば、前記一次処理水に含有されるリ
ン酸のＰ当量に対して、Ｃａ当量がほぼ２〜２．５倍と
なるようにする。The amount of calcium hydroxide added in the second step is, for example, about 2 to 2.5 times the Ca equivalent relative to the P equivalent of phosphoric acid contained in the primary treated water. To be
【００１０】また、前記第３の工程は、例えば、ｐＨが
２より低い条件で行う。The third step is carried out, for example, under the condition that the pH is lower than 2.
【００１１】本発明によれば、低い添加薬剤で濃厚リン
酸含有排水中のリン酸をほぼ純粋なリン酸一水素カルシ
ウム（ＣａＨＰＯ4）として回収でき、また、このＣａ
ＨＰＯ4は資源として再利用できる。According to the present invention, phosphoric acid in wastewater containing concentrated phosphoric acid can be recovered as almost pure calcium monohydrogen phosphate (CaHPO 4 ) with a low additive, and the Ca
HPO 4 can be reused as a resource.
【００１２】本発明の第１の工程では、リン酸をＣａＨ
ＰＯ4として回収する。すなわち、ｐＨ５〜７の条件で
濃厚リン酸含有排水とＣａ（ＯＨ）2とを反応させるこ
とにより、リン酸をＣａＨＰＯ4として回収する。な
お、このときの反応式は以下のとおりである。In the first step of the present invention, phosphoric acid is replaced with CaH.
Collect as PO 4 . That is, the phosphoric acid is recovered as CaHPO 4 by reacting the concentrated phosphoric acid-containing wastewater with Ca (OH) 2 under conditions of pH 5 to 7. The reaction formula at this time is as follows.
【００１３】 Ｃａ2+ ＋ Ｈ3ＰＯ4 → ＣａＨＰＯ4 （２） 上述した反応式（１）においては、Ｃａ：Ｐ＝３：２で
あるのに対し、この反応式（２）では、Ｃａ：Ｐ＝１：
１である。したがって、本発明によると、Ｐに対するＣ
ａの添加当量は、従来と比較して三分の二に低減され
る。また、ｐＨ５〜７の条件で反応させればよいので、
Ｐに対して必要なＣａは、ＣａＨＰＯ4としてほぼ当量
程度でよく、従来のように過剰のＣａを添加する必要が
ない。また、これにより、ＣａＨＰＯ4はほぼ純粋な形
で回収でき、資源利用等の各種用途に利用できる。Ca 2+ + H 3 PO 4 → CaHPO 4 (2) In the above reaction formula (1), Ca: P = 3: 2, whereas in this reaction formula (2), Ca: P = 1:
It is one. Therefore, according to the present invention, C for P
The addition equivalent of a is reduced to two thirds as compared with the conventional one. In addition, since the reaction may be performed under the conditions of pH 5 to 7,
The Ca required for P is approximately equivalent to CaHPO 4 , and it is not necessary to add an excessive Ca as in the conventional case. Further, as a result, CaHPO 4 can be recovered in a substantially pure form and can be used for various purposes such as resource utilization.
【００１４】このように濃厚リン酸含有排水を処理する
と、例えば、１００ｇ−Ｈ3ＰＯ4／ｌの排水とした場
合、ＣａＨＰＯ4は１０〜１５％程度の濃度となるた
め、直接脱水機により、不溶性物と一次処理液とに分離
することができる。When the concentrated phosphoric acid-containing wastewater is treated in this manner, for example, when the wastewater is 100 g-H 3 PO 4 / l, CaHPO 4 has a concentration of about 10 to 15%. An insoluble matter and a primary treatment liquid can be separated.
【００１５】このように本発明の第１の工程で得られた
一次処理液は、まだリン酸濃度が高いため、第２の工程
で、さらに、Ｃａ（ＯＨ）2をｐＨ９〜１１の条件で添
加することにより、リン酸を沈殿させ、処理液濃度を、
例えば、５ｍｇ−Ｐ／ｌ以下と十分に低減させる。な
お、かかる第２の工程は、過剰のＣａ（ＯＨ）2を添加
し、ｐＨ９〜１１の条件で反応させているため、不溶性
物はＣａ3（ＰＯ4）2の形態になっている。As described above, since the primary treatment liquid obtained in the first step of the present invention still has a high phosphoric acid concentration, in the second step, Ca (OH) 2 is further added under the condition of pH 9-11. By adding, the phosphoric acid is precipitated and the concentration of the treatment solution is
For example, it is sufficiently reduced to 5 mg-P / l or less. Incidentally, according a second step, adding an excess of Ca (OH) 2, since the reacted under the conditions of pH 9-11, insolubles is in the form Ca 3 (PO 4) 2.
【００１６】この第２の工程の不溶性物は、例えば、沈
降分離等により分離し、第１の工程の原液である濃厚リ
ン酸含有排水に溶解させる。ここで、不溶化物は、次式
にしたがって再溶解する。なお、この再溶解は、ｐＨ＜
２の条件で生じる。The insoluble matter in the second step is separated by, for example, sedimentation and the like, and dissolved in the concentrated phosphoric acid-containing waste water which is the stock solution in the first step. Here, the insoluble matter is redissolved according to the following equation. In addition, this re-dissolution is
It occurs under the condition of 2.
【００１７】 Ｃａ3（ＰＯ4）2 ＋ ４Ｈ3ＰＯ4 → ３Ｃａ2+ ＋ ６Ｈ2ＰＯ4 - （３） そして、このようにして再溶解により生成したＨ2ＰＯ4
-は、上述した第１の工程で、ＣａＨＰＯ4として沈殿さ
せることができる。したがって、本発明では、全てのリ
ン酸を純度の高いＣａＨＰＯ4として回収することがで
きる。[0017] Ca 3 (PO 4) 2 + 4H 3 PO 4 → 3Ca 2+ + 6H 2 PO 4 - (3) Then, H 2 PO 4 produced by redissolving this way
- is the first step described above, it can be precipitated as CaHPO 4. Therefore, in the present invention, all phosphoric acid can be recovered as highly pure CaHPO 4 .
【００１８】[0018]
【発明の実施の形態】以下、本発明をさらに詳細に説明
する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.
【００１９】図１には、本発明方法の実施の形態の説明
するための濃厚リン酸含有排水の処理装置を概念的に示
す。同図に示すように、溶解槽１０、ＣａＨＰＯ4生成
槽２０、脱水槽３０、処理水仕上槽４０および沈殿槽５
０が順次載置されている。FIG. 1 conceptually shows a treatment device for concentrated phosphoric acid-containing wastewater for explaining an embodiment of the method of the present invention. As shown in the figure, dissolution tank 10, CaHPO 4 production tank 20, dehydration tank 30, treated water finishing tank 40 and precipitation tank 5
0s are sequentially placed.
【００２０】本発明方法を実施するためには、まず、Ｃ
ａＨＰＯ4生成槽２０に、溶解槽１０中の濃厚リン酸含
有排水を導入するとともに、Ｃａ（ＯＨ）2を導入し、
両者をｐＨ５〜７の条件で反応させる。この反応は、例
えば、１５０ｒｐｍで撹拌しながら１０〜３０時間程度
行う。To carry out the method of the present invention, first, C
Introducing the concentrated phosphoric acid-containing wastewater in the dissolution tank 10 into the aHPO 4 production tank 20 and Ca (OH) 2
Both are reacted under conditions of pH 5 to 7. This reaction is performed, for example, for about 10 to 30 hours while stirring at 150 rpm.
【００２１】次いで、ＣａＨＰＯ4生成槽２０で生成し
たＣａＨＰＯ4生成物を脱水機３０で分離し、濾液を処
理水仕上槽４０に導入する。[0021] Then, the CaHPO 4 product produced in CaHPO 4 generation tank 20 is separated in dehydrator 30, introducing the filtrate into treated water finishing tank 40.
【００２２】処理液仕上槽４０には、濾液と共にＣａ
（ＯＨ）2を導入し、両者をｐＨ９〜１１の条件で反応
させる。この反応は、例えば、３０分程度行えばよい。In the treatment liquid finishing tank 40, Ca together with the filtrate is added.
(OH) 2 is introduced, and both are reacted under the condition of pH 9-11. This reaction may be performed for about 30 minutes, for example.
【００２３】続いて、この反応性性物を沈殿槽５０に移
し、例えば、３時間程度放置して沈殿物を分離する。こ
こで、分離された沈殿物は溶解槽１０に戻して、濃厚リ
ン酸含有排水に溶解し、沈殿槽の処理液は排出する。Then, the reactive substance is transferred to the precipitation tank 50 and left for, for example, about 3 hours to separate the precipitate. Here, the separated precipitate is returned to the dissolution tank 10 and dissolved in the concentrated phosphoric acid-containing wastewater, and the treatment liquid in the precipitation tank is discharged.
【００２４】（実施例）Ｈ3ＰＯ4（８５％）を１７０℃
で２時間加熱した後、１００ｇ−Ｈ3ＰＯ4／ｌに希釈し
た原水を濃厚リン酸含有排水として使用し、図１に示す
装置を用い、上述したフローにしたがって処理を実施し
た。なお、ここで用いた原水は、半導体工場の窒化膜エ
ッチングにおいて、８５％リン酸が１７０℃で加熱した
状態で用いられ、その後リンス液と混合されて１０％程
度の濃度になる排水を再現したものである。(Example) H 3 PO 4 (85%) was added at 170 ° C.
After heating for 2 hours at 100 ° C., the raw water diluted to 100 g-H 3 PO 4 / l was used as the concentrated phosphoric acid-containing wastewater, and the treatment was performed according to the above-described flow using the apparatus shown in FIG. The raw water used here was used in the etching of a nitride film in a semiconductor factory in a state where 85% phosphoric acid was heated at 170 ° C., and was then mixed with a rinse liquid to reproduce a wastewater having a concentration of about 10%. It is a thing.
【００２５】本実施例では、２５０ｍｌの溶解槽１０、
２５ｌのＣａＨＰＯ4生成槽２０、２５０ｍｌの処理水
仕上槽４０および３ｌの沈殿槽５０を用い、脱水機３０
の代わりに濾紙（５Ｃ）を用いた濾過を行った。原水
は、１ｌ／ｈｒの流量で溶解槽１０に導入し、また、沈
殿槽５０からの処理液も１ｌ／ｈｒで溶解槽１０に戻す
ようにし、溶解槽１０での溶解時間３０分、ＣａＨＰＯ
4生成槽２０での反応時間２４時間、処理水仕上槽４０
での反応時間３０分、沈殿槽５０での堆積時間３時間と
した。また、ＣａＨＰＯ4生成槽２０へのＣａ（ＯＨ）2
添加量は、Ｃａ当量／Ｐ当量＝１．００とし、ＣａＨＰ
Ｏ4生成槽２０のｐＨは６、処理液仕上槽４０のｐＨは
１０とした。In this embodiment, the 250 ml dissolution tank 10,
A 25 l CaHPO 4 production tank 20, a 250 ml treated water finishing tank 40 and a 3 l precipitation tank 50 were used, and a dehydrator 30 was used.
Was filtered using a filter paper (5C) instead of. Raw water is introduced into the dissolution tank 10 at a flow rate of 1 l / hr, and the treatment liquid from the precipitation tank 50 is also returned to the dissolution tank 10 at 1 l / hr. The dissolution time in the dissolution tank 10 is 30 minutes, and CaHPO is used.
4 Reaction time in the production tank 20 is 24 hours, treated water finishing tank 40
The reaction time was 30 minutes, and the deposition time in the settling tank 50 was 3 hours. In addition, Ca (OH) 2 to the CaHPO 4 production tank 20
The addition amount is Ca equivalent / P equivalent = 1.00, and CaHP
The pH of the O 4 production tank 20 was 6, and the pH of the treatment liquid finishing tank 40 was 10.
【００２６】以上の処理の結果、ＣａＨＰＯ4生成槽２
０での反応後の濾液中のＨ3ＰＯ4濃度は、１０ｇ／ｌで
あり、最終処理液のリン濃度は、１ｍｇ−Ｐ／ｌ以下で
あり、濾過により分離された沈殿物の乾燥後の組成は、
ＣａＨＰＯ4が９８％であり、再利用可能なものであっ
た。As a result of the above processing, the CaHPO 4 production tank 2
The H 3 PO 4 concentration in the filtrate after the reaction at 0 was 10 g / l, the phosphorus concentration in the final treatment liquid was 1 mg-P / l or less, and the precipitate separated by filtration was dried. The composition is
98% of CaHPO 4 was reusable.
【００２７】ここで、乾燥後の組成は、１０５℃で乾燥
後、塩酸で溶解し、Ｃａを吸光度法で分析し、さらに、
ＮａＯＨで中和後、イオンクロマトグラフィにより、Ｐ
Ｏ4 2-を測定しすることにより決定した。なお、ＣａＨ
ＰＯ4は、Ｘ線回折により確認された。Here, the composition after drying was dried at 105 ° C., dissolved in hydrochloric acid, and analyzed for Ca by the absorbance method.
After neutralization with NaOH, P by ion chromatography
It was determined by measuring O 4 2− . In addition, CaH
PO 4 was confirmed by X-ray diffraction.
【００２８】（比較例）実施例と同様な原水を図２に示
すようなフローで処理した。すなわち、２４ｌの処理槽
１００に１００ｇ−Ｈ3ＰＯ4／ｌの原水を、１ｌ／ｈｒ
の流量で導入し且つＣａ（ＯＨ）2を添加して、２４時
間反応させ、その反応性性物を濾紙（５Ｃ）１１０およ
びロート１２０を用いて濾過した。ここで、処理槽１０
０のｐＨは１０とし、Ｃａ（ＯＨ）2添加量は、Ｃａ当
量／Ｐ当量＝２．２５とした。(Comparative Example) Raw water similar to that of the example was treated by the flow shown in FIG. That is, 100 g-H 3 PO 4 / l raw water was added to a 24 l treatment tank 100 at 1 l / hr.
Was introduced at a flow rate of 10% and Ca (OH) 2 was added, the reaction was carried out for 24 hours, and the reactive material was filtered using a filter paper (5C) 110 and a funnel 120. Here, the processing tank 10
The pH of 0 was 10, and the amount of Ca (OH) 2 added was Ca equivalent / P equivalent = 2.25.
【００２９】このような処理の結果、処理水のリン濃度
は、１ｍｇ−Ｐ／ｌであり、濾別された不溶化物の組成
は、Ｃａ3（ＰＯ4）2が６８％、Ｃａ（ＯＨ）2が２８％
であった。なお、乾燥後の組成は、上述した実施例と同
様な方法で決定した。As a result of such treatment, the phosphorus concentration in the treated water was 1 mg-P / l, and the composition of the insoluble matter filtered out was 68% Ca 3 (PO 4 ) 2 and Ca (OH) 2. 2 is 28%
Met. The composition after drying was determined by the same method as in the above-mentioned examples.
【００３０】[0030]
【発明の効果】以上説明したように、本発明方法によれ
ば、濃厚リン酸含有排水から、低減した添加薬剤で排水
中のリン酸を二次利用できる形態で効率よく回収するこ
とができるという効果を奏する。As described above, according to the method of the present invention, it is possible to efficiently recover the phosphoric acid in the wastewater containing concentrated phosphoric acid in a form in which it can be secondarily utilized with a reduced additive agent. Produce an effect.
【図１】本発明方法を実施する処理装置の一例を概念的
に示す模式図である。FIG. 1 is a schematic view conceptually showing an example of a processing apparatus for carrying out the method of the present invention.
【図２】比較例の処理を説明するための説明図である。FIG. 2 is an explanatory diagram illustrating a process of a comparative example.
【符号の説明】 １０ 溶解槽 ２０ ＣａＨＰＯ4生成槽 ３０ 脱水機 ４０ 処理水仕上槽 ５０ 沈殿槽[Explanation of symbols] 10 dissolution tank 20 CaHPO 4 production tank 30 dehydrator 40 treated water finishing tank 50 precipitation tank
Claims (2)
の条件で水酸化カルシウムと反応させてリン酸一水素カ
ルシウムを生成し、これを不溶性物として分離する第１
の工程と、この第１の工程の一次処理液をｐＨ９〜１１
の条件で水酸化カルシウムと反応させて生成した不溶性
物を分離する第２の工程と、この第２の工程で分離した
不溶性物を前記第１の工程で処理する前記濃厚リン酸含
有排水に溶解させる第３の工程とを有することを特徴と
する濃厚リン酸含有排水の処理方法。1. The treated wastewater containing concentrated phosphoric acid has a pH of 5 to 7.
Under the conditions described above, it reacts with calcium hydroxide to produce calcium monohydrogen phosphate, which is separated as an insoluble substance.
And the primary treatment liquid of the first step are adjusted to pH 9 to 11
The second step of separating the insoluble matter produced by reacting with calcium hydroxide under the conditions of 1), and dissolving the insoluble matter separated in this second step in the concentrated phosphoric acid-containing wastewater treated in the first step And a third step of allowing the concentrated phosphoric acid-containing wastewater to be treated.
水酸化カルシウムの添加量を、前記濃厚リン酸含有処理
水に含有されるリン酸のＰ当量に対して、Ｃａ当量がほ
ぼ同一となるようにすることを特徴とする濃厚リン酸含
有排水の処理方法。2. The calcium equivalent in the first step is substantially the same as the Ca equivalent with respect to the P equivalent of phosphoric acid contained in the concentrated phosphoric acid-containing treated water in the first step. A method for treating concentrated phosphoric acid-containing wastewater, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07206096A JP3994227B2 (en) | 1996-03-27 | 1996-03-27 | Treatment method for concentrated phosphoric acid-containing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07206096A JP3994227B2 (en) | 1996-03-27 | 1996-03-27 | Treatment method for concentrated phosphoric acid-containing wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09253658A true JPH09253658A (en) | 1997-09-30 |
| JP3994227B2 JP3994227B2 (en) | 2007-10-17 |
Family
ID=13478479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07206096A Expired - Fee Related JP3994227B2 (en) | 1996-03-27 | 1996-03-27 | Treatment method for concentrated phosphoric acid-containing wastewater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3994227B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002035765A (en) * | 2000-07-21 | 2002-02-05 | Japan Organo Co Ltd | Method for removing target component from water to be treated and crystallization apparatus |
| JP2010012413A (en) * | 2008-07-03 | 2010-01-21 | Japan Organo Co Ltd | Apparatus and method for treating phosphoric acid-containing water |
| JP2010012430A (en) * | 2008-07-04 | 2010-01-21 | Japan Organo Co Ltd | Apparatus and method for treating phosphoric acid-containing water |
| JP2010069416A (en) * | 2008-09-18 | 2010-04-02 | Japan Organo Co Ltd | Treatment device for phosphoric acid-containing water |
| JP2010075780A (en) * | 2008-09-24 | 2010-04-08 | Japan Organo Co Ltd | Apparatus for treating phosphoric acid-containing water |
| JP2010104869A (en) * | 2008-10-28 | 2010-05-13 | Japan Organo Co Ltd | Apparatus and method for treating phosphoric acid-containing water |
| US20110218377A1 (en) * | 2007-10-24 | 2011-09-08 | Ching-Tsuen Huang | Method for solidifying and stabilizing waste acid |
-
1996
- 1996-03-27 JP JP07206096A patent/JP3994227B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002035765A (en) * | 2000-07-21 | 2002-02-05 | Japan Organo Co Ltd | Method for removing target component from water to be treated and crystallization apparatus |
| US20110218377A1 (en) * | 2007-10-24 | 2011-09-08 | Ching-Tsuen Huang | Method for solidifying and stabilizing waste acid |
| US20120041249A1 (en) * | 2007-10-24 | 2012-02-16 | Atomic Energy Council - Institute Of Nuclear Energy Research | Method for solidifying and stabilizing waste acid |
| US8227655B2 (en) * | 2007-10-24 | 2012-07-24 | Atomic Energy Council-Institute Of Nuclear Energy Research | Method for solidifying and stabilizing waste acid |
| US8430803B2 (en) * | 2007-10-24 | 2013-04-30 | Atomic Energy Council—Institute of Nuclear Energy Research | Method for solidifying and stabilizing waste acid |
| JP2010012413A (en) * | 2008-07-03 | 2010-01-21 | Japan Organo Co Ltd | Apparatus and method for treating phosphoric acid-containing water |
| JP2010012430A (en) * | 2008-07-04 | 2010-01-21 | Japan Organo Co Ltd | Apparatus and method for treating phosphoric acid-containing water |
| JP2010069416A (en) * | 2008-09-18 | 2010-04-02 | Japan Organo Co Ltd | Treatment device for phosphoric acid-containing water |
| JP2010075780A (en) * | 2008-09-24 | 2010-04-08 | Japan Organo Co Ltd | Apparatus for treating phosphoric acid-containing water |
| JP2010104869A (en) * | 2008-10-28 | 2010-05-13 | Japan Organo Co Ltd | Apparatus and method for treating phosphoric acid-containing water |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3994227B2 (en) | 2007-10-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3692671A (en) | Rare earth ion removal from waste water | |
| US4028237A (en) | Method and apparatus for treatment of fluorine-containing waste waters | |
| JP4243649B2 (en) | Method for producing calcium phosphate and aluminum hydroxide from sludge incineration ash | |
| RU2353577C2 (en) | Method of phosphate ore processing | |
| CN115124013B (en) | Preparation method of battery-grade ferric orthophosphate | |
| US2164627A (en) | Process for treatment of phosphatic solutions | |
| JP3994227B2 (en) | Treatment method for concentrated phosphoric acid-containing wastewater | |
| JP4584185B2 (en) | Method and apparatus for treating wastewater containing boron | |
| JP3240669B2 (en) | Treatment of wastewater containing fluorine and silicon | |
| JP2007098325A (en) | Treatment method and apparatus for fluorine-containing water | |
| RU2126415C1 (en) | Method of removing phosphorus-containing waste resulting from preparation of omega-amino-(c2-c6) alkylidene- 1-hydroxy-1,1-bisphosphonic acid salts, and deposited mixture of calcium-and phosphorus-containing salts | |
| CN115321736A (en) | Treatment method of glyphosate production wastewater and high-value recycling of phosphorus-containing waste | |
| JP4543482B2 (en) | Fluorine-containing water treatment method | |
| JP4288336B2 (en) | Method for producing calcium phosphate from wastewater | |
| KR20180069432A (en) | Manufacturing method of lithiium carbonate using brine | |
| JP2001219177A (en) | Method and apparatus for treating fluorine-containing water | |
| US1984146A (en) | Production of disodium phosphate | |
| JPS59120286A (en) | Treatment of waste water containing fluorine component | |
| JP2004284908A (en) | Method of separating and recovering calcium phosphate or magnesium phosphate from phosphorous acid-containing plating waste solution | |
| JP3593726B2 (en) | Method for treating wastewater containing sulfuric acid and copper | |
| JP2598456B2 (en) | Treatment method for phosphate-containing water | |
| JP3786732B2 (en) | Treatment method of phosphite-containing waste liquid | |
| JP5330329B2 (en) | Method and apparatus for treating wastewater containing boron | |
| JPS608968B2 (en) | Method for producing zinc-free alkali metal phosphate solution | |
| JPS58199088A (en) | Treatment of fluorine ion-containing water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20060630 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20070131 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070328 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20070418 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070608 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20070704 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20070717 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100810 Year of fee payment: 3 |
|
| R150 | Certificate of patent (=grant) or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100810 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110810 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120810 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130810 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140810 Year of fee payment: 7 |
|
| LAPS | Cancellation because of no payment of annual fees |