JP2501129B2 - Method for treating organic phosphoric acid - Google Patents
Method for treating organic phosphoric acidInfo
- Publication number
- JP2501129B2 JP2501129B2 JP789290A JP789290A JP2501129B2 JP 2501129 B2 JP2501129 B2 JP 2501129B2 JP 789290 A JP789290 A JP 789290A JP 789290 A JP789290 A JP 789290A JP 2501129 B2 JP2501129 B2 JP 2501129B2
- Authority
- JP
- Japan
- Prior art keywords
- phosphoric acid
- organic phosphoric
- additive
- heating
- tbp
- 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.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/36—Aluminium phosphates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/30—Alkali metal phosphates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/32—Phosphates of magnesium, calcium, strontium, or barium
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、ウランの製錬工程又は核燃料再処理工程の
ウランおよびプルトニウム抽出工程より廃有機溶媒とし
て発生する有機リン酸の処理方法に関する。TECHNICAL FIELD The present invention relates to a method for treating an organic phosphoric acid generated as a waste organic solvent from a uranium and plutonium extraction step in a uranium smelting step or a nuclear fuel reprocessing step.
（従来技術とその問題点） ウランの精錬工程や使用済原子燃料の再処理工程でウ
ラン及びプルトニウムの抽出に用いられるリン酸トリプ
チル等の有機リン酸は何回かの再生使用の後、廃棄物と
して液体のまゝ貯蔵されることが多い。それは廃溶媒中
に放射性物質が含有されることや該有機リン酸溶媒は排
出基準を定められたリンを含むため、そのまま排水でき
ないことと焼却によつて大気中にリンを放出できないこ
と等のためである。しかし、液体のままでの貯蔵は、漏
出の可能性及び化学的安定性のよくない観点から望まし
くない。そのためにこれまでいくつかの処理方法が試み
られている。例えば特開昭63-67595号公報記載の方法
は、有機リン酸エステルに含水塩化アルミニウムあるい
はポリ塩化アルミニウム等の固化剤を添化して固化する
方法であるが、固化剤が塩化物であるため固化物を得る
加熱段階で塩素ガス、塩化水素あるいは塩素化合物が大
気中へ放出される問題がある。また特開昭63-262597号
及び特開昭63-290998号公報記載の方法は、有機リン酸
を水熱条件下で酸化分解した後アルカリ土類金属水酸化
物を添加して固化処理する方法であるが、水熱条件が常
圧でなく高圧であるために装置が特殊化する問題があ
る。(Prior art and its problems) Organic phosphoric acid such as tryptyl phosphate, which is used for uranium and plutonium extraction in the uranium refining process and spent nuclear fuel reprocessing process, is a waste product after being reused several times. It is often stored as a liquid. It is because radioactive substances are contained in the waste solvent and the organic phosphoric acid solvent contains phosphorus whose emission standards have been set, so it cannot be drained as it is and cannot be released to the atmosphere by incineration. Is. However, storage as a liquid is not desirable due to the potential for leakage and poor chemical stability. Therefore, several processing methods have been tried so far. For example, the method described in JP-A-63-67595 is a method of solidifying by adding a solidifying agent such as hydrous aluminum chloride or polyaluminum chloride to an organic phosphoric acid ester, but since the solidifying agent is a chloride, it is solidified. There is a problem that chlorine gas, hydrogen chloride or chlorine compounds are released into the atmosphere during the heating step for obtaining the product. Further, the methods described in JP-A-63-262597 and JP-A-63-290998 are a method in which an organic phosphoric acid is oxidatively decomposed under hydrothermal conditions and then an alkaline earth metal hydroxide is added to perform solidification treatment. However, there is a problem that the device is specialized because the hydrothermal condition is not normal pressure but high pressure.
（発明の目的） 本発明者等は上記の従来技術の問題点を解決し、有機
リン酸溶媒と混合性のよい化合物を添加して加熱または
焼却の段階で反応を十分に行わせて安定な固体のリン酸
化合物を生成する処理方法を提供すべく、研究を重ねた
結果、脂肪族カルボン酸金属化合物CnH2n+1COOM（Ｍ＝
K,Ca,Al）を添加することによつて上記目的を達成しう
ることを見出し、本発明に到達した。(Object of the Invention) The present inventors have solved the above-mentioned problems of the prior art and added a compound having good miscibility with an organic phosphoric acid solvent to sufficiently carry out the reaction at the stage of heating or incineration to stabilize the reaction As a result of repeated research to provide a treatment method for producing a solid phosphoric acid compound, an aliphatic carboxylic acid metal compound C n H 2n + 1 COOM (M =
The inventors have found that the above object can be achieved by adding (K, Ca, Al) and have reached the present invention.
（発明の構成） すなわち、本発明によれば、有機リン酸を主成分とす
る廃有機溶媒を、脂肪族カルボン酸の金属化合物CnH
2n+1COOM（Ｍ＝K,Ca,Al）の少なくとも１種を主成分と
する添加剤と混合し、加熱することにより、または加熱
後焼却させることにより、該リン分を含む安定な固化物
とすることを特徴とする有機リン酸の処理方法、が得ら
れる。(Structure of the Invention) That is, according to the present invention, the waste organic solvent containing organic phosphoric acid as a main component is treated with a metal compound C n H of an aliphatic carboxylic acid.
2n + 1 COOM (M = K, Ca, Al) by mixing with an additive containing at least one of the main components and heating or by incineration after heating, a stable solidified product containing the phosphorus content A method for treating an organic phosphoric acid, characterized in that
本発明方法では、このように有機リン酸溶媒と反応さ
せる添加剤は実施例の項で後述するが、無機化合物より
混合性のよい有機金属化合物例えば、CH3COOK，(CH3CO
O)2Ca，(C17H35COO)2Ca等脂肪族カルボン酸金属化合物C
nH2n+1COOM,（Ｍ＝K,Ca,Al）でこれらを有機リン酸溶媒
と加熱して均一に混合または溶解させ、さらに加熱する
か焼却によつてアルキル成分のみを分解させて、高温ま
で安定なK3PO4（融点m.p＝1340℃）、Ca3(PO4)2（m.p＝
1670℃）AlPO4（m.p＞1500℃）を生成させるのである。In the present invention method will be described later in the section of this additive to be reacted with an organic phosphoric acid solvent as the embodiment may organometallic compound having miscibility inorganic compounds e.g., CH 3 COOK, (CH 3 CO
O) 2 Ca, (C 17 H 35 COO) 2 Ca etc. Aliphatic carboxylic acid metal compound C
n H 2n + 1 COOM, (M = K, Ca, Al) are heated with an organic phosphoric acid solvent to uniformly mix or dissolve, and further heated or incinerated to decompose only the alkyl component, Stable up to high temperature K 3 PO 4 (melting point mp = 1340 ℃), Ca 3 (PO 4 ) 2 (mp =
1670 ℃) AlPO 4 (mp> 1500 ℃) is generated.
本発明方法において、添加剤としての脂肪族カルボン
酸金属化合物は分子量の小さい酢酸系のものが好まし
い。それは処理量が少なくてすみ、また有機リン酸との
混合性、反応性がよいからである。In the method of the present invention, the aliphatic carboxylic acid metal compound as an additive is preferably an acetic acid-based compound having a small molecular weight. This is because it requires only a small amount of treatment and has good compatibility and reactivity with organic phosphoric acid.
本発明方法で最も重要な点は、有機リン酸としてリン
酸トリプチルを使用する場合にはその沸点（289℃）以
下の加熱温度で添加剤がリン酸トリブイルと均一に混合
またはリン酸トリブチルに溶解してリン成分を蒸発散逸
することなく反応させること、すなわち、有機リン酸と
添加剤が一旦均一相を形成すれば、有機リン酸が蒸発し
やすい沸点以上に加熱したり、または焼却しても、リン
成分は添加剤と完全に反応し、リン成分を蒸発散逸する
ことなく、安定な固化物が得られることにある。The most important point in the method of the present invention is that when triptyl phosphate is used as the organic phosphoric acid, the additive is uniformly mixed with tribuyl phosphate or dissolved in tributyl phosphate at a heating temperature below its boiling point (289 ° C). And reacting the phosphorus component without evaporating and dissipating, that is, once the organic phosphoric acid and the additive form a uniform phase, even if the organic phosphoric acid is heated to a temperature above the boiling point where it easily evaporates, or is incinerated. The phosphorus component completely reacts with the additive, and a stable solidified product can be obtained without evaporating the phosphorus component.
次に、本発明を実施例により具体的に説明するが、以
下の実施例は本発明の範囲を限定するものではない。こ
れら実施例において、有機リン酸廃液として、リン酸ト
リブチル又はリン酸トリブチル＋C6H6を使用し、添加剤
として、それぞれ(C17H35COO)2Ca，(CH3COO)2Ca・H2O，C
H3COOKを用いた。Next, the present invention will be described specifically with reference to examples, but the following examples do not limit the scope of the present invention. In these examples, tributyl phosphate or tributyl phosphate + C 6 H 6 was used as the organic phosphoric acid waste liquid, and (C 17 H 35 COO) 2 Ca and (CH 3 COO) 2 Ca · H were used as additives, respectively. 2 O, C
H 3 COOK was used.
次に実施例を表１に従つて説明する。 Next, an example will be described according to Table 1.
実施例１ リン酸トリブチル（TBP,以下TBPという）9mlに添加剤
としてステアリン酸カルシウム粉末を27.715g添加し加
熱した。試料温度が徐々に上昇し、90℃に達した段階で
粉末のステアリン酸カルシウムは液化とともにTBPに均
一に溶解した状態となつた。さらに加熱で180℃以上
に加熱すると白煙が発生し有機成分が分解してくる。加
熱でさらに300℃以上に加熱すると白煙の発生が激し
くなる。白煙の発生が終了する前に試料に点火し燃焼さ
せた。燃焼が終了したところで白色の固体の主成物が得
られた。その試料をさらに800℃、３時間加熱して得ら
れた固体生成物の重量は4.744gであつた。出発原料の重
量から反応生成物がCa3(PO4)2としたときの理論的重量
は4.720gであり、実測値は理論値とほぼ一致した。すな
わち、TBP中のリン成分は加熱から燃焼の過程において
も損失することなく、Ca3(PO4)2として処理できること
が確認できた。念のため、得られた固体生成物の成分元
素分析を行つたが、実施値は、生成物をCa3(PO4)2とし
たときの理論値とほぼ一致しており、生成物がCa3(PO4)
2であることが確認された。Example 1 27.715 g of calcium stearate powder was added as an additive to 9 ml of tributyl phosphate (TBP, hereinafter referred to as TBP) and heated. When the sample temperature gradually increased and reached 90 ° C, the powdery calcium stearate became liquefied and uniformly dissolved in TBP. When heated to 180 ° C or higher, white smoke is generated and organic components are decomposed. When heated to 300 ° C or higher, white smoke becomes more intense. The sample was ignited and burned before the end of generation of white smoke. At the end of combustion, a white solid main product was obtained. The sample was further heated at 800 ° C. for 3 hours, and the weight of the solid product obtained was 4.744 g. The theoretical weight was 4.720 g when the reaction product was Ca 3 (PO 4 ) 2 from the weight of the starting material, and the measured value was in good agreement with the theoretical value. That is, it was confirmed that the phosphorus component in TBP can be treated as Ca 3 (PO 4 ) 2 without loss even in the process of heating to combustion. As a precaution, the elemental analysis of the obtained solid product was performed, but the practical values were almost the same as the theoretical values when the product was Ca 3 (PO 4 ) 2 and the product was Ca 3 (PO 4 )
It was confirmed to be 2 .
一方、90℃で加熱溶解して均一に液化した後の試料
を、加熱との過程を経ずに、直接燃焼させた実施例
でも、得られた固体生成物重量の実測値は、理論値と一
致した。すなわち、添加剤が添加しTBPに均一に溶解し
た後であれば、さらに時間のかかる加熱過程を必要とせ
ず、直ちに焼却処理によつてリン成分を大気に放出する
ことなく安定な固体のリン化合物に処理できることが確
認された。On the other hand, even in the example in which the sample after being heated and melted at 90 ° C. to be uniformly liquefied was directly burned without going through the process of heating, the measured value of the obtained solid product weight was the theoretical value. Matched That is, if the additive is added and uniformly dissolved in TBP, a heating process that takes more time is not required, and a stable solid phosphorus compound without immediately releasing the phosphorus component to the atmosphere by incineration treatment. It was confirmed that it can be processed.
なお実施例で燃焼後の白色の生成物の表面に部分的に
黒色の煤が観察された。これはTBPや添加剤の有機成分
の不完全燃焼による煤であり、燃焼の際空気を強制的に
送ることで煤を生じないことで確認された。これは実施
例２と３の場合も同様であつた。In the examples, black soot was partially observed on the surface of the white product after burning. This is soot due to incomplete combustion of organic components of TBP and additives, and it was confirmed that soot is not generated by forcibly sending air during combustion. This was also the case in Examples 2 and 3.
実施例２ TBP等の有機リン酸は抽出剤として使用されるとき、
ベンゼンやドデカンおよびケロシン等の稀釈剤との混合
溶液で用いられる。TBP30％，ベンゼン70％の混合溶液
を試験試験としたのが実施例２である。最初の加熱の段
階でベンゼンが蒸発するが、蒸発し終つたところから液
温が上昇し始め、90℃でTBPと添加剤とは均一に液化し
た。それ以降は実施例１と同様の結果が得られた。Example 2 When an organic phosphoric acid such as TBP is used as an extractant,
Used as a mixed solution with diluents such as benzene, dodecane and kerosene. In Example 2, a mixed test solution containing 30% TBP and 70% benzene was used as a test test. Benzene evaporates in the first heating stage, but the liquid temperature started to rise after evaporation, and TBP and the additive were liquefied uniformly at 90 ° C. After that, the same results as in Example 1 were obtained.
実施例３ TBP30％，ベンゼン70％の混合溶液30mlに、添加剤と
して酢酸カルシウム(CH3COO)2Ca・H2O）を8.040g添加し
加熱した。ベンゼンが蒸発し終つた段階からTBPと添加
剤が徐々に反応し白色の固体となつた。それ以降は実施
例1,2と同様の試験過程によつて、最終的にCa3(PO4)2の
生成物が得られることが確認させた。Example 3 8.040 g of calcium acetate (CH 3 COO) 2 Ca.H 2 O) was added as an additive to 30 ml of a mixed solution of 30% TBP and 70% benzene and heated. From the stage when benzene was completely evaporated, TBP and the additive gradually reacted to form a white solid. After that, it was confirmed that the product of Ca 3 (PO 4 ) 2 was finally obtained by the same test process as in Examples 1 and 2 .
実施例４ TPB30％，ベンゼン70％の混合溶液30mlに、添加剤と
して酢酸カリウム（CH3COOK）を9.183g添加し加熱し
た。ベンゼンが蒸発し終り、液温が90℃のままでは添加
剤はTBPに溶解せず下層に沈降した状態である。さらに
加熱で180℃以上に加熱した段階で、添加剤はTBPに溶
解して均一になるとともに、有機成分の分解ガスである
白煙が発生してくる。さらに温度を上げた加熱の段階
で、全体が白い結晶状の固体となる。この固体は可燃性
であり、点火して燃焼させ、さらに800℃、３時間加熱
して得られた白色の結晶物の重量は6.706gであつた。出
発原料の重量から、反応生成物がK3PO4としたときの理
論的重量は6.621gである。両者の値はよく一致しTBP中
のリンを損失することなくK3PO4として固定できている
ことが確認できた。Example 4 To 30 ml of a mixed solution of 30% TPB and 70% benzene, 9.183 g of potassium acetate (CH 3 COOK) was added as an additive and heated. When benzene has completely evaporated and the liquid temperature remains at 90 ° C, the additive does not dissolve in TBP and precipitates in the lower layer. When heated to 180 ° C or higher, the additive dissolves in TBP and becomes uniform, and white smoke, which is a decomposition gas of organic components, is generated. At the heating stage where the temperature is further raised, the whole becomes a white crystalline solid. This solid was flammable, and a white crystal obtained by igniting and burning and heating at 800 ° C. for 3 hours weighed 6.706 g. Based on the weight of the starting materials, the theoretical weight is 6.621 g when the reaction product is K 3 PO 4 . Both values were in good agreement, and it was confirmed that the phosphorus in TBP could be fixed as K 3 PO 4 without loss.
一方、加熱で添加剤とTBPが均一になつた段階の試
料を、加熱を経ずに、直接燃焼して得られた生成物重
量の実測値は6.682gであり理論値と一致した。すなわち
この場合も、添加剤がTBPに溶解して一旦均一状態にな
つた後であれば、直ちに焼却処理によつてTBP中のリン
をK3PO4として固定できることが確認できた。On the other hand, the measured value of the product weight obtained by directly burning the sample at the stage where the additive and TBP became uniform by heating without heating was 6.682 g, which was in agreement with the theoretical value. That is, also in this case, it was confirmed that the phosphorus in TBP could be fixed as K 3 PO 4 by incineration immediately after the additive was dissolved in TBP and once became uniform.
比較例 リン酸トリブチルに添加剤として、AlCl3やCaCl2の如
き無機化合物を加えると、混合性が悪く、かつ加熱反応
により、塩素または塩化物を発生させる。またリン酸ト
リブチルとLiOHの反応では高圧（100〜200kg/cm2）を必
要とする。 Comparative Example When an inorganic compound such as AlCl 3 or CaCl 2 is added as an additive to tributyl phosphate, the miscibility is poor and chlorine or chloride is generated by the heating reaction. Also, the reaction of tributyl phosphate and LiOH requires high pressure (100-200 kg / cm 2 ).
このように、無機化合物は本発明方法では添加剤とし
て上記の有機金属化合物よりはるかに劣るものであり、
不適である。Thus, the inorganic compounds are far inferior to the above organometallic compounds as additives in the method of the present invention,
Not suitable.
（発明の効果） 本発明は上記の構成をとることによつて次の効果を示
す。(Effects of the Invention) The present invention has the following effects due to the above configuration.
（１） AlCl3やCaCl2のような無機化合物を添加すると
加熱反応によつて塩素または塩化物を発生させるが、本
発明では無機化合物より混合性のよい有機金属化合物CH
3COOK,(CH3COO)2Ca，(C17H35COO)2Ca等脂肪族カルボン
酸金属化合物（CnH2n+1COOM,M＝K,Ca,Al）を添加し、加
熱して均一に混合または溶解させ、さらに、加熱するか
焼却によつて、アルキル成分を分解させてCO2とH2Oとに
し、無害である。(1) When an inorganic compound such as AlCl 3 or CaCl 2 is added, chlorine or chloride is generated by a heating reaction, but in the present invention, an organometallic compound CH having a better miscibility than an inorganic compound.
3 COOK, (CH 3 COO) 2 Ca, (C 17 H 35 COO) 2 Ca etc. Aliphatic carboxylic acid metal compound (C n H 2n + 1 COOM, M = K, Ca, Al) is added and heated. It is harmless because it is uniformly mixed or dissolved, and then heated or incinerated to decompose the alkyl component into CO 2 and H 2 O.
（２） 本発明では焼却によつてリン成分を損失するこ
となくリン酸金属化合物にすることができ、処分が簡単
である。(2) In the present invention, the metal phosphate can be converted to a metal phosphate compound without loss by incineration, and the disposal is easy.
（３） リン酸トリブチルとLiOHの反応では高圧（100
〜200kg/cm3）を必要とするが、本発明では常圧でよ
い。(3) In the reaction of tributyl phosphate and LiOH, high pressure (100
˜200 kg / cm 3 ) is required, but normal pressure is sufficient in the present invention.
Claims (2)
脂肪族カルボン酸の金属化合物CnH2n+1COOM（Ｍ＝K,Ca,
Al）の少なくとも１種を主成分とする添加剤と混合し、
加熱することにより、または加熱後焼却させることによ
り、該リン分を含む安定な固化物とすることを特徴とす
る有機リン酸の処理方法。1. A waste organic solvent containing organic phosphoric acid as a main component,
Metallic compound of aliphatic carboxylic acid C n H 2n + 1 COOM (M = K, Ca,
Al) mixed with an additive containing at least one of
A method for treating an organic phosphoric acid, which comprises forming a stable solidified product containing the phosphorus content by heating or by incineration after heating.
あるいは酢酸アルミニウムを主成分とする請求項第１項
記載の処理方法。2. The processing method according to claim 1, wherein the additive contains potassium acetate, calcium acetate or aluminum acetate as a main component.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP789290A JP2501129B2 (en) | 1990-01-17 | 1990-01-17 | Method for treating organic phosphoric acid |
| GB9100251A GB2240333B (en) | 1990-01-17 | 1991-01-07 | Process for treating organic phosphoric acids |
| FR9100437A FR2658099B1 (en) | 1990-01-17 | 1991-01-16 | PROCESS FOR TREATING RESIDUAL ORGANIC PHOSPHORIC COMPOUNDS FORMED IN A URANIUM REFINING PROCESS. |
| US08/026,204 US5276251A (en) | 1990-01-17 | 1993-03-02 | Process for treating organic phosphoric acids |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP789290A JP2501129B2 (en) | 1990-01-17 | 1990-01-17 | Method for treating organic phosphoric acid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03211497A JPH03211497A (en) | 1991-09-17 |
| JP2501129B2 true JP2501129B2 (en) | 1996-05-29 |
Family
ID=11678235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP789290A Expired - Fee Related JP2501129B2 (en) | 1990-01-17 | 1990-01-17 | Method for treating organic phosphoric acid |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2501129B2 (en) |
| FR (1) | FR2658099B1 (en) |
| GB (1) | GB2240333B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2713386B2 (en) * | 1991-11-05 | 1998-02-16 | 日本碍子 株式会社 | Treatment method of phosphorus-containing waste oil |
| EP1761459B1 (en) * | 2004-03-15 | 2017-02-01 | Eidgenössische Technische Hochschule Zürich | Flame synthesis of metal salt nanoparticles, in particular calcium and phosphate comprising nanoparticles |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE455998A (en) * | ||||
| US3617569A (en) * | 1970-07-31 | 1971-11-02 | Dow Chemical Co | Removal of phosphate from waste water |
| SE461072B (en) * | 1984-02-17 | 1990-01-08 | Bror Olof Haeger | PROCEDURE IS TO FIX ARSENIC ACID AND / OR ARSENATE IN MARKET AND APPLICATION OF SUBSTANCES OF YEARS, ALUMINUM OR CHROME WITH WEAVE ACID, FOR THIS PURPOSE |
| JPH066177B2 (en) * | 1987-01-13 | 1994-01-26 | 大豊産業株式会社 | Immobilization treatment agent for liquid organic halides using industrial waste, immobilization treatment method and combustion treatment method |
-
1990
- 1990-01-17 JP JP789290A patent/JP2501129B2/en not_active Expired - Fee Related
-
1991
- 1991-01-07 GB GB9100251A patent/GB2240333B/en not_active Expired - Fee Related
- 1991-01-16 FR FR9100437A patent/FR2658099B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB2240333A (en) | 1991-07-31 |
| JPH03211497A (en) | 1991-09-17 |
| GB2240333B (en) | 1995-03-08 |
| FR2658099A1 (en) | 1991-08-16 |
| GB9100251D0 (en) | 1991-02-20 |
| FR2658099B1 (en) | 1993-02-19 |
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