JPH0551359B2 - - Google Patents
Info
- Publication number
- JPH0551359B2 JPH0551359B2 JP61073129A JP7312986A JPH0551359B2 JP H0551359 B2 JPH0551359 B2 JP H0551359B2 JP 61073129 A JP61073129 A JP 61073129A JP 7312986 A JP7312986 A JP 7312986A JP H0551359 B2 JPH0551359 B2 JP H0551359B2
- Authority
- JP
- Japan
- Prior art keywords
- added
- fluorine
- salts
- stage
- coagulation
- 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
- 239000002351 wastewater Substances 0.000 claims description 18
- 229910052731 fluorine Inorganic materials 0.000 claims description 15
- 239000011737 fluorine Substances 0.000 claims description 15
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 14
- 230000015271 coagulation Effects 0.000 claims description 14
- 238000005345 coagulation Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 150000002221 fluorine Chemical class 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 239000006228 supernatant Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 230000002378 acidificating effect Effects 0.000 claims description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000011575 calcium Substances 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000002562 thickening agent Substances 0.000 description 6
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002222 fluorine compounds Chemical class 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 description 1
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- -1 aluminum compound Chemical class 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000004673 fluoride salts Chemical class 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical compound F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Removal Of Specific Substances (AREA)
Description
（産業上の利用分野）
本発明はガラス及びフリツト製造工場等から排
出されるホウフツ化物及びフツ素の塩類を含む排
水の処理方法に関するものである。
（従来の技術）
フツ素を含有する排水の処理方法としては、石
灰又は塩化カルシウムを加えることによりフツ素
をCaF2として沈澱させる方法や、多価金属に水
酸化物を添加して凝集沈澱を行わせる方法が知ら
れている（例えば、特開昭52−28165号公報）。と
ころが、特開昭52−38772号、特公昭54−5628号
公報等にも記されているように、排水中にホウフ
ツ化物が含有されている場合にはこれらの方法に
よつてはフツ素濃度を15PPM以下にまで低下さ
せることが困難であり、特に排水中にホウフツ化
物のほかにフツ化アルミニウム、フツ化ケイ素等
の錯塩やフツ化物塩等の多種多様な塩類が多量に
含まれている場合にはこれらが処理を阻害するた
め、フツ素濃度を15〜20PPM程度にしか低下さ
せることができず、5PPM以下にすることは極め
て困難とされていた。
（発明が解決しようとする問題点）
本発明は上記のような従来の問題点を解決し
て、排水中にホウフツ化物やフツ素の塩類が多量
に含有されている場合にも、フツ素濃度を工業的
に5PPM以下にまで低下させることができるホウ
フツ化物及びフツ素の塩類を含む排水の処理方法
を目的として完成されたものである。
（問題点を解決するための手段）
上記の課題を解決するためになされた本発明
は、原水を60℃以上に加熱するとともにAl3+／
Ｆの重量比が0.23以上になるようAl2（SO4）3を添
加してホウフツ化物をPH２〜４の酸性領域におい
て２時間から10時間保持して熱分解させ、次に
Ca（OH）2によりアルカリ側にPH調整してシリコ
ン塩を含むフツ化物を分解させ、冷却槽で40℃以
下に冷却したうえ凝集剤を加えて第１段の凝沈を
行わせ、その上澄液を分離した後、該上澄液に常
温でAl2（SO4）3とCa（OH）2を加え更に凝集剤を添
加して第２段に凝沈を行わせ、この操作を複数回
繰り返して排水中のフツ素濃度を5ppm以下まで
浄化することを特徴とするものである。
本発明においては、ホウフツ化物及びフツ素の
塩類を含有する原水を熱分解槽に導入して60℃以
上更に好ましくは70℃以上の温度に加熱するとと
もに、Al3+／Ｆの重量比が0.23以上となるように
Al2（SO4）3を添加し、更にH2SO4やCa（OH）2を適
当量添加してPHを２〜４に調整し、２時間〜10時
間保持して原水中のホウフツ化物を酸性領域にお
いて次のように熱分解させる。
3HBF4＋2Al3+＋9H2O→2AlF4 -3＋3H3BO3＋12H+
このときAl3+／Ｆの比が0.23未満であるとホウ
フツ化物の分解ができなくなるおそれがあるの
で、Al3+／Ｆの比を0.23以上とすることが工程の
安全を確保するために必要である。また原水を60
℃以上に加熱することは、上記の反応を促進する
ために必要であり、これ以下の温度では反応速度
が低下して10時間をはるかに越える極めて長い処
理時間をかけなければホウフツ化物を熱分解する
ことができなくなる。このように、本発明では
Al3+／Ｆの比を0.23以上とし、60℃程度の比較的
低温で、しかも２〜10時間という比較的短い時間
でホウフツ化物の熱処理を行わせることができる
こととなる。次に反応槽においてCa（OH）2等の
カルシウム塩を添加して液をアルカリ側にPH調整
すると、例えば次のような反応によつてシリコン
塩を含むフツ化物は分解され不溶性のCaF2等と
なる。この反応を阻害するホウフツ化物は前工程
の熱分解によつて予め除かれているので、フツ化
物の分解は円滑に進行する。
2HF＋Ca（OH）2→CaF2↓＋2H2O
H2SiF6＋3Ca（OH）2→3CaF2↓
＋H2SiO3＋3H2O
そこで液温を冷却槽において40℃以下まで冷却
したうえでシツクナーにおいて凝集剤を添加して
第１段の凝沈を行わせれば、フツ素塩類はフロツ
クとして沈澱する。このように、フツ化物の分解
後に冷却槽において40℃以下まで冷却を行うの
は、シツクナーにおける対流の発生を抑制し、凝
沈がより効率的に行われるようにするためであ
る。そしてこの沈澱物をシツクナーの下部からス
ラリーとして引出し、フイルタープレス等により
脱水処理してスラツジとして分離する。
上澄液は次に２番目の反応槽に移されて常温に
てAl2（SO4）3とCa（OH）2とを再び添加され、第２
のシツクナーにおいて凝集剤を加えて第２段の凝
沈を行わせ、第２のシツクナーの上澄液に対して
は必要に応じて更に第３段の凝沈が行われ、かく
して熱分解と多段凝沈とが行われた後の排水から
はホウフツ化物をフツ素の塩類がほぼ完全に除去
されてフツ素濃度を5PPM以下にまで低下させる
ことが可能となる。
なお、２段目以下ではホウフツ化物を分解する
必要がないので、反応を常温で行わせるものとす
る。
以上に説明した本発明の効果を確認するため次
の実験を行つた。
実験例
本発明に従い、原水にAl2（SO4）3を添加し、
H2SO4、Co（OH）3にてPH３に調整し80℃で７時
間熱分解した後にCo（OH）3にてPHを調整し、こ
れを濾過して１段処理水を得た。この１段処理水
を常温状態で多価金属とCo（OH）2にてPHを調整
し、濾過して２段処理水を得た。２段処理と同様
にして３段処理水を得た。
以上の様にして次の結果を得ることができた。
(Industrial Application Field) The present invention relates to a method for treating wastewater containing borofluorides and fluorine salts discharged from glass and frit manufacturing factories. (Prior art) Methods for treating wastewater containing fluorine include adding lime or calcium chloride to precipitate fluorine as CaF2 , and adding hydroxide to polyvalent metals to cause coagulation and precipitation. A method for doing this is known (for example, Japanese Patent Laid-Open No. 52-28165). However, as stated in Japanese Patent Application Laid-open No. 52-38772 and Japanese Patent Publication No. 54-5628, etc., when borofluoride is contained in wastewater, these methods can reduce the fluorine concentration. It is difficult to reduce this to 15 PPM or less, especially when wastewater contains large amounts of various salts such as complex salts such as aluminum fluoride and silicon fluoride, and fluoride salts in addition to borofluorides. Because these substances inhibit the process, it is only possible to reduce the fluorine concentration to about 15 to 20 PPM, and it has been considered extremely difficult to reduce it to 5 PPM or less. (Problems to be Solved by the Invention) The present invention solves the conventional problems as described above, and reduces the fluorine concentration even when wastewater contains a large amount of borofluorides and fluorine salts. This was completed with the aim of developing a method for treating wastewater containing borofluoride and fluorine salts, which can industrially reduce the concentration to 5 PPM or less. (Means for Solving the Problems) The present invention, which was made to solve the above problems, heats raw water to 60°C or higher and at the same time heats Al 3+ /
Al 2 (SO 4 ) 3 is added so that the weight ratio of F is 0.23 or more, and the borofluoride is kept in an acidic region of PH 2 to 4 for 2 to 10 hours to thermally decompose it, and then
The pH is adjusted to the alkaline side using Ca(OH) 2 to decompose the fluoride containing silicon salts, the mixture is cooled to below 40℃ in a cooling tank, and a flocculant is added to perform the first stage of coagulation. After separating the clear liquid, Al 2 (SO 4 ) 3 and Ca(OH) 2 are added to the supernatant liquid at room temperature, and a flocculant is added to cause coagulation in the second stage, and this operation is repeated multiple times. This method is characterized by purifying the fluorine concentration in wastewater to 5 ppm or less by repeating the process several times. In the present invention, raw water containing borofluorides and fluorine salts is introduced into a pyrolysis tank and heated to a temperature of 60°C or higher, preferably 70°C or higher, and the weight ratio of Al 3+ /F is 0.23. As above
Add Al 2 (SO 4 ) 3 and further add appropriate amounts of H 2 SO 4 and Ca(OH) 2 to adjust the pH to 2 to 4, and hold for 2 to 10 hours to remove borofluorides in the raw water. is thermally decomposed in an acidic region as follows. 3HBF 4 +2Al 3+ +9H 2 O→2AlF 4 -3 +3H 3 BO 3 +12H + At this time, if the ratio of Al 3+ /F is less than 0.23, decomposition of borofluoride may not be possible, so Al 3+ / It is necessary to set the F ratio to 0.23 or more to ensure process safety. Also raw water 60
Heating above ℃ is necessary to promote the above reaction; below this temperature, the reaction rate slows down and the borofluoride cannot be thermally decomposed unless a very long treatment time of much more than 10 hours is used. be unable to do so. In this way, the present invention
By setting the Al 3+ /F ratio to 0.23 or more, the borofluoride can be heat-treated at a relatively low temperature of about 60° C. and in a relatively short time of 2 to 10 hours. Next, when the pH of the solution is adjusted to the alkaline side by adding calcium salts such as Ca(OH) 2 in the reaction tank, fluorides containing silicon salts are decomposed by the following reaction, and insoluble CaF 2 etc. becomes. Since the borofluoride that inhibits this reaction has been removed in advance by thermal decomposition in the previous step, the decomposition of the fluoride proceeds smoothly. 2HF＋Ca(OH) 2 →CaF 2 ↓＋2H 2 O H 2 SiF 6 +3Ca(OH) 2 →3CaF 2 ↓ +H 2 SiO 3 +3H 2 O Then, the liquid temperature was cooled to below 40℃ in a cooling tank, and then a flocculant was added in a thickener. When the first step of coagulation is carried out by adding fluorine salts, the fluorine salts are precipitated as flocs. The reason why the fluoride is cooled down to 40° C. or lower in the cooling tank after decomposition is to suppress the generation of convection in the thickener and allow for more efficient coagulation. This precipitate is then drawn out as a slurry from the bottom of the thickener, dehydrated using a filter press, etc., and separated as a sludge. The supernatant liquid was then transferred to the second reaction tank and Al 2 (SO 4 ) 3 and Ca(OH) 2 were added again at room temperature.
In the thickener, a flocculant is added to carry out a second stage of coagulation, and the supernatant liquid of the second thickener is further subjected to a third stage of coagulation as necessary, thus resulting in thermal decomposition and multi-stage coagulation. After the coagulation, the borofluoride and fluorine salts are almost completely removed from the wastewater, making it possible to reduce the fluorine concentration to 5 PPM or less. In addition, since it is not necessary to decompose the borofluoride in the second stage and below, the reaction is carried out at room temperature. The following experiment was conducted to confirm the effects of the present invention described above. Experimental Example According to the present invention, Al 2 (SO 4 ) 3 was added to raw water,
After adjusting the pH to 3 with H 2 SO 4 and Co(OH) 3 and thermally decomposing it at 80° C. for 7 hours, the pH was adjusted with Co(OH) 3 and filtered to obtain first-stage treated water. The pH of this first-stage treated water was adjusted at room temperature using a polyvalent metal and Co(OH) 2 and filtered to obtain second-stage treated water. Third-stage treated water was obtained in the same manner as the second-stage treatment. In the manner described above, the following results were obtained.
【表】
（実施例）
フリツト製造工場から100m3／日の割合で排出
されるホウフツ化物と各種のフツ素の塩類とを含
有する全フツ素濃度3000PPMの排水を熱分解槽
に入れてボイラーからの蒸気を吹込み、約80℃に
加熱した。この排水中にAl2（SO4）3を450Kg／日
の割合で、H2SO4を52Kg／日の割合で、Ca
（OH）2を14Kg／日の割合で添加して排水のPHを
３に調整し、８時間保持してホウフツ化物を熱分
解させた。このときAl3+／Ｆの値は0.23であつ
た。次に反応槽において230Kg／日の割合でCa
（OH）2を加えてPHをアルカリ側に調整したうえ
で液温を冷却槽で40℃まで下げ、第１のシツクナ
ーにおいて２Kg／日の割合で凝集剤を添加して発
生するフロツクを沈澱させた。この段階で上澄液
中の全フツ素濃度は20PPMであり、この後常温
のまま上澄液にAl2（SO4）3とCa（OH）2を加え更に
凝集剤を添加して第２段の凝沈を行わせ、更に同
様に第３段の凝沈で行わせた結果、排水中の全フ
ツ素濃度は3PPM、PH7.1の清浄水として放流す
ることが可能となつた。
（発明の効果）
本発明は以上の説明から明らかなように、先ず
Al3+／Ｆ＞0.23、液温60℃以上でPH２〜４望まし
くは３付近の酸性条件下で２時間から10時間保持
してアルミニウム化合物によるホウフツ化物の熱
分解を行わせたうえ、Ca（OH）2によりアルカリ
側へPH調整してフツ素及びその塩類の分解、常温
における凝沈を複数段行わせるようにしたもので
あるから、従来法によつてはフツ素濃度を15〜
20PPM程度までしか低下させることができなつ
たホウフツ化物及びフツ素の塩類を含有する排水
を5PPM以下まで浄化することができる。よつて
本発明はガラス及びフリツト製造工場からの排水
を始め、メツキ工場、半導体製造工場等のフツ素
含有排水の処理方法として好適なものであり、従
来の問題点を解決したホウフツ化物及びフツ素の
塩類を含む排水の処理方法として産業の発展に寄
与するところは極めて大である。[Table] (Example) Wastewater with a total fluorine concentration of 3000 PPM containing borofluoride and various fluorine salts discharged from a frit manufacturing factory at a rate of 100 m 3 /day was put into a pyrolysis tank and released from a boiler. Steam was blown into the container and heated to approximately 80°C. In this wastewater, Al 2 (SO 4 ) 3 was added at a rate of 450 kg/day, H 2 SO 4 was added at a rate of 52 kg/day, and Ca was added at a rate of 52 kg/day.
(OH) 2 was added at a rate of 14 kg/day to adjust the pH of the wastewater to 3, and this was maintained for 8 hours to thermally decompose the borofluoride. At this time, the value of Al 3+ /F was 0.23. Next, in the reaction tank, Ca was added at a rate of 230Kg/day.
(OH) 2 was added to adjust the pH to alkaline side, and then the liquid temperature was lowered to 40℃ in a cooling tank, and flocculant was added at a rate of 2 kg/day in the first thickener to precipitate the generated flocs. Ta. At this stage, the total fluorine concentration in the supernatant was 20 PPM, and after that, Al 2 (SO 4 ) 3 and Ca(OH) 2 were added to the supernatant at room temperature, and a flocculant was added to make a second As a result of performing stage coagulation and then performing the same third stage coagulation, it became possible to discharge the wastewater as clean water with a total fluorine concentration of 3 PPM and a pH of 7.1. (Effects of the Invention) As is clear from the above description, the present invention has the following advantages:
Al 3+ /F > 0.23, the liquid temperature is 60°C or higher, the temperature is maintained under acidic conditions of pH 2 to 4, preferably around 3, for 2 to 10 hours to thermally decompose the borofluoride by the aluminum compound, and Ca( Since the pH is adjusted to the alkaline side using OH) 2 , decomposition of fluorine and its salts, and multiple stages of coagulation at room temperature are carried out, the fluorine concentration is lower than 15 to 15% by conventional methods.
Wastewater containing borofluorides and fluorine salts, which could only be reduced to about 20 PPM, can be purified to below 5 PPM. Therefore, the present invention is suitable as a method for treating fluorine-containing wastewater from glass and frit manufacturing plants, as well as fluorine-containing wastewater from Metsuki factories, semiconductor manufacturing plants, etc. The contribution to industrial development as a treatment method for wastewater containing salts is extremely large.
Claims (1)
Ｆの重量比が0.23以上となるようAl2（SO4）3を添
加してホウフツ化物をPH２〜４の酸性領域におい
て２時間から10時間保持して熱分解させ、次に
Ca（OH）2によりアルカリ側にPH調整してシリコ
ン塩を含むフツ化物を分解させ、冷却槽で40℃以
下に冷却したうえ凝集剤を加えて第１段の凝沈を
行わせ、その上澄液を分離した後、該上澄液に常
温でAl2（SO4）3とCa（CH）2を加え更に凝集剤を添
加して第２段の凝沈を行わせ、この操作を複数回
繰り返して排水中のフツ素濃度を5ppm以下まで
浄化することを特徴とするホウフツ化物及びフツ
素の塩類を含む排水の処理方法。1 Heating raw water to 60℃ or higher and Al 3+ /
Al 2 (SO 4 ) 3 is added so that the weight ratio of F is 0.23 or more, and the borofluoride is kept in an acidic region of PH 2 to 4 for 2 to 10 hours to thermally decompose it, and then
The pH is adjusted to the alkaline side using Ca(OH) 2 to decompose the fluoride containing silicon salts, the mixture is cooled to below 40℃ in a cooling tank, and a flocculant is added to perform the first stage of coagulation. After separating the clear liquid, Al 2 (SO 4 ) 3 and Ca (CH) 2 are added to the supernatant liquid at room temperature, and a flocculant is added to perform the second stage of coagulation, and this operation is repeated multiple times. A method for treating wastewater containing borofluorides and fluorine salts, which comprises purifying the fluorine concentration in the wastewater to 5 ppm or less by repeating the process several times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7312986A JPS62227496A (en) | 1986-03-31 | 1986-03-31 | Method for treating waste water containing borofluoride and salts of fluorine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7312986A JPS62227496A (en) | 1986-03-31 | 1986-03-31 | Method for treating waste water containing borofluoride and salts of fluorine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62227496A JPS62227496A (en) | 1987-10-06 |
| JPH0551359B2 true JPH0551359B2 (en) | 1993-08-02 |
Family
ID=13509296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7312986A Granted JPS62227496A (en) | 1986-03-31 | 1986-03-31 | Method for treating waste water containing borofluoride and salts of fluorine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62227496A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4338705B2 (en) * | 2006-01-31 | 2009-10-07 | 日本エコロジー株式会社 | Method for treating waste liquid containing borofluoride ions |
| JP4954131B2 (en) * | 2008-03-27 | 2012-06-13 | エコシステム秋田株式会社 | Treatment method of water containing borofluoride |
| JP5852188B1 (en) * | 2014-07-23 | 2016-02-03 | 株式会社アイザック | Method for fixing boron in coagulated sediment sludge |
| JP7089345B2 (en) * | 2017-05-25 | 2022-06-22 | 株式会社 イージーエス | Water treatment method and water treatment equipment |
| CN113060802A (en) * | 2021-04-16 | 2021-07-02 | 兰州交通大学 | Device and method for treating wastewater containing fluoroborate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51116060A (en) * | 1975-04-03 | 1976-10-13 | Morita Kagaku Kogyo Kk | Method of fixing fluorine in borofluoride-containing waste liquid |
| JPS5214068A (en) * | 1975-07-22 | 1977-02-02 | Morita Kagaku Kogyo Kk | Method of fixation of fluorine in waste liquid containing boron |
-
1986
- 1986-03-31 JP JP7312986A patent/JPS62227496A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51116060A (en) * | 1975-04-03 | 1976-10-13 | Morita Kagaku Kogyo Kk | Method of fixing fluorine in borofluoride-containing waste liquid |
| JPS5214068A (en) * | 1975-07-22 | 1977-02-02 | Morita Kagaku Kogyo Kk | Method of fixation of fluorine in waste liquid containing boron |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62227496A (en) | 1987-10-06 |
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