JPH0716577A - Treating method of fluoroborate-containing waste liquid - Google Patents
Treating method of fluoroborate-containing waste liquidInfo
- Publication number
- JPH0716577A JPH0716577A JP16125793A JP16125793A JPH0716577A JP H0716577 A JPH0716577 A JP H0716577A JP 16125793 A JP16125793 A JP 16125793A JP 16125793 A JP16125793 A JP 16125793A JP H0716577 A JPH0716577 A JP H0716577A
- Authority
- JP
- Japan
- Prior art keywords
- waste liquid
- aluminum
- ferric chloride
- amount
- iron powder
- 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
- 239000007788 liquid Substances 0.000 title claims abstract description 57
- 239000002699 waste material Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 23
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 239000011737 fluorine Substances 0.000 claims abstract description 16
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- -1 aluminum compound Chemical class 0.000 claims abstract description 7
- 229940043430 calcium compound Drugs 0.000 claims abstract description 4
- 150000001674 calcium compounds Chemical class 0.000 claims abstract description 4
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- 238000006386 neutralization reaction Methods 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 1
- 239000012530 fluid Substances 0.000 claims 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 15
- 238000010438 heat treatment Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 abstract description 3
- 150000002500 ions Chemical class 0.000 abstract description 3
- 238000005530 etching Methods 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 abstract 5
- 239000000463 material Substances 0.000 abstract 2
- 238000005476 soldering Methods 0.000 abstract 2
- 230000003472 neutralizing effect Effects 0.000 abstract 1
- 239000008267 milk Substances 0.000 description 11
- 210000004080 milk Anatomy 0.000 description 11
- 235000013336 milk Nutrition 0.000 description 11
- 230000035484 reaction time Effects 0.000 description 11
- 239000000654 additive Substances 0.000 description 8
- 230000000996 additive effect Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 239000011550 stock solution Substances 0.000 description 7
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 description 4
- 229910001447 ferric ion Inorganic materials 0.000 description 4
- 229910001448 ferrous ion Inorganic materials 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はホウフッ化物含有廃液の
処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating waste liquid containing borofluoride.
【０００２】[0002]
【従来の技術】ホウフッ化物含有廃液は主としてはんだ
めっきの廃液として生じる。このホウフッ化物含有廃液
中のフッ素は環境に与える影響が大きいことから、廃液
中の濃度が１５ｐｐｍ以下という規制がなされている。
一般に単にフッ素化合物が混入する廃液であれば、水酸
化カルシウム等を添加することにより、フッ化カルシウ
ムとして沈殿させて容易に除去できる。しかしながらホ
ウ酸が混入したホウフッ化物として存在するとその除去
処理が極めて困難になってくる。従来のホウフッ化物含
有廃液の処理方法は、廃液のｐＨを１〜２に調整して、
アルミニウム塩（硫酸バンド）またはカルシウム塩（塩
化カルシウム）を添加し、８０℃〜１００℃に２時間位
加熱して加水分解を起こさせ、その後石灰乳により中和
するものであった。Borofluoride-containing waste liquid is produced mainly as a waste liquid for solder plating. Since the fluorine in the borofluoride-containing waste liquid has a great influence on the environment, the concentration in the waste liquid is regulated to be 15 ppm or less.
In general, if the waste liquid is simply mixed with a fluorine compound, it can be easily removed by adding calcium hydroxide or the like to be precipitated as calcium fluoride. However, when it is present as borofluoride mixed with boric acid, its removal treatment becomes extremely difficult. The conventional method for treating borofluoride-containing waste liquid is to adjust the pH of the waste liquid to 1-2,
An aluminum salt (sulfuric acid band) or a calcium salt (calcium chloride) was added, heated at 80 ° C to 100 ° C for about 2 hours to cause hydrolysis, and then neutralized with lime milk.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記の
処理方法では、アルミニウム塩の添加量を増やしたり反
応時間を長くとっても、処理水中に数百ｐｐｍのフッ素
が残ってしまうのが現状であり、河川に放流する場合に
は希釈して基準をクリアーするしかなかった。また上記
処理方法では、８０℃〜１００℃に加熱する加熱工程が
必須のことから、処理コストが増大し、また甚だ危険な
作業が伴うという問題点があった。However, in the above-mentioned treatment method, even if the amount of aluminum salt added is increased or the reaction time is prolonged, several hundred ppm of fluorine remains in the treated water. When it was released into, it had to be diluted to clear the standard. Further, in the above processing method, since a heating step of heating to 80 ° C. to 100 ° C. is indispensable, there is a problem that the processing cost increases and a very dangerous work is involved.
【０００４】本発明は上記問題点を解決すべくなされた
ものであり、その目的とするところは、加熱処理が不要
で、また高度の有害イオンの除去ができるホウフッ化物
含有廃液の処理方法を提供するにある。The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for treating a borofluoride-containing waste liquid which does not require heat treatment and can highly remove harmful ions. There is.
【０００５】[0005]
【課題を解決するための手段】本発明は上記目的を達成
するため次の構成を備える。すなわち、ホウフッ化物含
有廃液に、アルミニウムもしくはアルミニウム化合物、
塩化第２鉄廃液、および鉄粉を加えて反応させ、該反応
物にカルシウム化合物を添加して中和することを特徴と
している。アルミニウム化合物は水酸化アルミニウムを
用いると好適である。また、水酸化アルミニウムの添加
量はホウフッ化物含有廃液中のフッ素量の７０ｗｔ％以
上、好ましくは８０ｗｔ％以上添加するとよい。The present invention has the following constitution in order to achieve the above object. That is, borofluoride-containing waste liquid, aluminum or aluminum compound,
It is characterized in that a ferric chloride waste liquid and iron powder are added and reacted, and a calcium compound is added to the reaction product for neutralization. Aluminum hydroxide is preferably used as the aluminum compound. Further, the addition amount of aluminum hydroxide is 70 wt% or more, preferably 80 wt% or more of the amount of fluorine in the borofluoride-containing waste liquid.
【０００６】[0006]
【作用】塩化第２鉄廃液は電子部品のエッチング処理の
廃液等として生じる。塩化第２鉄廃液中の第２鉄イオン
は鉄粉との反応により還元されて第１鉄イオンとなり、
さらに水酸化物となって沈殿する。水酸化アルミニウム
はそれ自体溶解度が低いものであるが、第２鉄イオンが
第１鉄イオンに還元される反応中におかれることで、理
由は定かでないが廃液中に溶解しやすくなり、これによ
りホウフッ化物の錯体が分解され、石灰乳によりフッ化
カルシウムとして沈殿するものと考えられる。The ferric chloride waste liquid is generated as a waste liquid for the etching process of electronic parts. The ferric ion in the ferric chloride waste liquid is reduced by reaction with iron powder to ferrous ion,
Furthermore, it becomes hydroxide and precipitates. Aluminum hydroxide itself has a low solubility, but by being placed in the reaction in which ferric ion is reduced to ferrous ion, it becomes easier to dissolve in the waste liquid, for unknown reasons. It is considered that the borofluoride complex is decomposed and precipitated as calcium fluoride by lime milk.
【０００７】[0007]
実施例１． １）廃液条件 原液濃度 ２８６００ｐｐｍ 処理量 ２．８ ｍ3 Ｆ含有量 ８０ Ｋｇ ２）添加薬品量 Ａｌ（ＯＨ）3 ２００ Ｋｇ Ａｌとして ６９ Ｋｇ（フッ素の８６％） 塩化第２鉄廃液 １．０ ｍ3 （Ｆｅ＝１５０００
０ｐｐｍ） Ｆｅとして １５０ Ｋｇ 鉄粉 ６０ Ｋｇ 石灰乳 当量 ３）結果 反応時間 １２ 時間 反応温度 ２５ ℃ Ｆ濃度 １２．０ ｐｐｍExample 1. 1) Waste liquid condition Stock solution concentration 28600ppm Treatment amount 2.8 m 3 F content 80 Kg 2) Additive chemical amount Al (OH) 3 200 Kg As Al 69 Kg (86% of fluorine) Ferric chloride waste liquid 1.0 m 3 (Fe = 15,000
0 ppm) As Fe 150 Kg Iron powder 60 Kg Lime milk equivalent 3) Result Reaction time 12 hours Reaction temperature 25 ° C F concentration 12.0 ppm
【０００８】実施例２． １）廃液条件 原液濃度 ３６６００ｐｐｍ 処理量 １．６ ｍ3 Ｆ含有量 ５７．６ Ｋｇ ２）添加薬品量 Ａｌ（ＯＨ）3 １５０ Ｋｇ Ａｌとして ５１ Ｋｇ（フッ素の８８％） 塩化第２鉄廃液 ２．０ ｍ3 （Ｆｅ＝１５０００
０ｐｐｍ） Ｆｅとして ３００ Ｋｇ 鉄粉 ５０ Ｋｇ 石灰乳 当量 ３）結果 反応時間 １２ 時間 反応温度 ３０ ℃ Ｆ濃度 ９．１ ｐｐｍExample 2. 1) Waste liquid condition Stock solution concentration 36600 ppm Treatment amount 1.6 m 3 F content 57.6 Kg 2) Additive chemical amount Al (OH) 3 150 Kg As Al 51 Kg (88% of fluorine) Ferric chloride waste liquid 2. 0 m 3 (Fe = 15000
0 ppm) As Fe 300 Kg Iron powder 50 Kg Lime milk equivalent 3) Result Reaction time 12 hours Reaction temperature 30 ° C F concentration 9.1 ppm
【０００９】実施例３． １）廃液条件 原液濃度 ５００００ｐｐｍ 処理量 １．７ ｍ3 Ｆ含有量 ８５ Ｋｇ ２）添加薬品量 Ａｌ（ＯＨ）3 ２００ Ｋｇ Ａｌとして ６９ Ｋｇ（フッ素の８０％） 塩化第２鉄廃液 １．０ ｍ3 （Ｆｅ＝１５０００
０ｐｐｍ） Ｆｅとして １５０ Ｋｇ 鉄粉 ６０ Ｋｇ 石灰乳 当量 ３）結果 反応時間 １２ 時間 反応温度 ４４ ℃ Ｆ濃度 １８ ｐｐｍEmbodiment 3. 1) Waste liquid condition Stock solution concentration 50,000 ppm Treatment amount 1.7 m 3 F content 85 Kg 2) Additive chemical amount Al (OH) 3 200 Kg As Al 69 Kg (80% of fluorine) Ferric chloride waste liquid 1.0 m 3 (Fe = 15,000
0 ppm) As Fe 150 Kg Iron powder 60 Kg Lime milk equivalent 3) Result Reaction time 12 hours Reaction temperature 44 ° C F concentration 18 ppm
【００１０】実施例４． １）廃液条件 原液濃度 ３００００ｐｐｍ 処理量 ５ ｍ3 Ｆ含有量 １５０ Ｋｇ ２）添加薬品量 Ａｌ（ＯＨ）3 ３００ Ｋｇ Ａｌとして １０４ Ｋｇ（フッ素の７０％） 塩化第２鉄廃液 ２．５ ｍ3 （Ｆｅ＝１５０００
０ｐｐｍ） Ｆｅとして ３７５ Ｋｇ 鉄粉 １００ Ｋｇ 石灰乳 当量 ３）結果 反応時間 １２ 時間 反応温度 ３０ ℃ Ｆ濃度 １３ ｐｐｍ 反応時間 １６ 時間 反応温度 ２６ ℃ Ｆ濃度 不検出Embodiment 4. 1) Waste liquid condition Stock solution concentration 30,000 ppm Treatment amount 5 m 3 F content 150 Kg 2) Additive chemical amount Al (OH) 3 300 Kg As Al 104 Kg (70% of fluorine) Ferric chloride waste liquid 2.5 m 3 ( Fe = 15000
0ppm) As Fe 375 Kg Iron powder 100 Kg Lime milk equivalent 3) Result Reaction time 12 hours Reaction temperature 30 ° C F concentration 13 ppm Reaction time 16 hours Reaction temperature 26 ° C F concentration not detected
【００１１】実施例５． １）廃液条件 原液濃度 ３００００ｐｐｍ 処理量 ５ ｍ3 Ｆ含有量 １５０ Ｋｇ ２）添加薬品量 Ａｌ（ＯＨ）3 ４００ Ｋｇ Ａｌとして １３８ Ｋｇ（フッ素の９２％） 塩化第２鉄廃液 ２．５ ｍ3 （Ｆｅ＝１５０００
０ｐｐｍ） Ｆｅとして ３７５ Ｋｇ 鉄粉 １００ Ｋｇ 石灰乳 当量 ３）結果 反応時間（時間） 反応温度（℃） Ｆ濃度（ｐｐｍ） １ ３０ ９２８ ２ ３１ ６２４ ４ ２８ ６３ ６ ２８ ４４ １２ ２７ ４ ２４ ２３ 不検出Embodiment 5. 1) Waste liquid condition Stock solution concentration 30,000 ppm Treatment amount 5 m 3 F content 150 Kg 2) Additive chemical amount Al (OH) 3 400 Kg As Al 138 Kg (92% of fluorine) Ferric chloride waste liquid 2.5 m 3 ( Fe = 15000
0ppm) As Fe 375 Kg Iron powder 100 Kg Lime milk equivalent 3) Result Reaction time (hour) Reaction temperature (° C) F concentration (ppm) 1 30 928 2 31 624 4 28 28 63 6 28 4 44 12 27 27 4 24 23 Not detected
【００１２】実施例６． １）廃液条件 原液濃度 ９０００ ｐｐｍ 処理量 １．６ ｍ3 Ｆ含有量 １４ Ｋｇ ２）添加薬品量 Ａｌ（ＯＨ）3 ２００ Ｋｇ Ａｌとして ６９ Ｋｇ（フッ素の４．８
倍） 塩化第２鉄廃液 １．５ ｍ3 （Ｆｅ＝１５０００
０ｐｐｍ） Ｆｅとして ２２５ Ｋｇ 鉄粉 ６０ Ｋｇ 石灰乳 当量 ３）結果 反応時間 １ 時間 反応温度 ４６ ℃ Ｆ濃度 １２６０ ｐｐｍ 反応時間 １６ 時間 反応温度 ４２ ℃ Ｆ濃度 不検出Embodiment 6. 1) Waste liquid condition Stock solution concentration 9000 ppm Treatment amount 1.6 m 3 F content 14 Kg 2) Additive chemical amount Al (OH) 3 200 Kg As Al 69 Kg (Fluorine 4.8)
2 times) Ferric chloride waste liquid 1.5 m 3 (Fe = 15000
0ppm) As Fe 225 Kg Iron powder 60 Kg Lime milk equivalent 3) Result Reaction time 1 hour Reaction temperature 46 ° C F concentration 1260 ppm Reaction time 16 hours Reaction temperature 42 ° C F concentration not detected
【００１３】実施例７．添加する水酸化アルミニウムの
量を一定にして（アルミニウムとしてフッ素の７４
％）、塩化第２鉄廃液および鉄粉の量を変化させ、それ
に伴う処理後のフッ素濃度を測定した。その結果を表１
に示す。Embodiment 7. The amount of aluminum hydroxide added is kept constant (74% fluorine as aluminum).
%), The amount of ferric chloride waste liquid and the amount of iron powder were changed, and the fluorine concentration after the treatment was changed accordingly. The results are shown in Table 1.
Shown in.
【００１４】[0014]
【表１】 [Table 1]
【００１５】比較例１． １）廃液条件 原液濃度 ３００００ｐｐｍ 処理量 １．６ ｍ3 Ｆ含有量 ４８ Ｋｇ ２）添加薬品量 Ａｌ（ＯＨ）3 ７５ Ｋｇ Ａｌとして ２５ Ｋｇ（フッ素の５２％） 塩化第２鉄廃液 ２．０ ｍ3 （Ｆｅ＝１５０００
０ｐｐｍ） Ｆｅとして ３００ Ｋｇ 鉄粉 ６０ Ｋｇ 石灰乳 当量 ３）結果 反応時間 １６ 時間 Ｆ濃度 ３０９ ｐｐｍComparative Example 1. 1) Waste liquid condition Stock solution concentration 30000ppm Treatment amount 1.6 m 3 F content 48 Kg 2) Additive chemical amount Al (OH) 3 75 Kg As Al 25 Kg (52% of fluorine) Ferric chloride waste liquid 2.0 m 3 (Fe = 15,000
0 ppm) As Fe 300 Kg Iron powder 60 Kg Lime milk equivalent 3) Result Reaction time 16 hours F concentration 309 ppm
【００１６】比較例２． １）廃液条件 原液濃度 ３３１００ｐｐｍ 処理量 ５．０ ｍ3 Ｆ含有量 １６５．５Ｋｇ ２）添加薬品量 Ａｌ（ＯＨ）3 ２７５ Ｋｇ Ａｌとして ９５ Ｋｇ（フッ素の５２％） 塩化第２鉄廃液 ２．５ ｍ3 （Ｆｅ＝１５０００
０ｐｐｍ） Ｆｅとして ３７５ Ｋｇ 鉄粉 １００ Ｋｇ 石灰乳 当量 ３）結果 反応時間 １６ 時間 反応温度 ３０ ℃ Ｆ濃度 １９９ ｐｐｍComparative Example 2. 1) Waste liquid condition Raw liquid concentration 33100ppm Treatment amount 5.0 m 3 F content 165.5Kg 2) Additive chemical amount Al (OH) 3 275 Kg As Al 95 Kg (52% of fluorine) Ferric chloride waste liquid 2.5 m 3 (Fe = 15000
0 ppm) As Fe 375 Kg Iron powder 100 Kg Lime milk equivalent 3) Result Reaction time 16 hours Reaction temperature 30 ° C F concentration 199 ppm
【００１７】[0017]
【００１８】〔考察〕塩化第２鉄廃液中の第２鉄イオン
は鉄粉との反応により還元されて第１鉄イオンとなり、
さらに水酸化物となって沈殿する。水酸化アルミニウム
はそれ自体溶解度が低いものであるが、第２鉄イオンが
第１鉄イオンに還元される反応中におかれることで、理
由は定かでないが廃液中に溶解しやすくなり、これによ
りホウフッ化物の錯体が分解され、石灰乳によりフッ化
カルシウムとして沈殿するものと考えられる。このよう
に、塩化第２鉄廃液をホウフッ化物含有廃液と混合する
ことで、ホウフッ化物錯体の分解が促進され、フッ化カ
ルシウムとして沈殿させることができる。水酸化アルミ
ニウムの添加量が重要であり、実施例１〜６および比較
例１、２から明らかなようにフッ素量の７０ｗｔ％以上
で効果があり、最適には８０ｗｔ％以上が好ましい。な
お過剰に添加しても処理時間にそれほど有為差は認めら
れない（実施例６）。これに比較して塩化第２鉄廃液お
よび鉄粉の添加量は処理時間に影響がある。すなわち表
１から明らかなように、水酸化アルミニウムが所定量以
上添加されていれば、塩化第２鉄廃液および鉄粉の添加
量が多いほど処理時間が短縮されることがわかる。な
お、反応温度は加熱したわけではなく、自然上昇温度で
あるが、それほどの温度上昇はなく、反応槽の耐熱構造
はほとんど不要である。また水酸化アルミニウムほどの
効果はないが、アルミニウムもしくは硫酸アルミニウ
ム、アルミン酸ナトリウム等のアルミニウム化合物を用
いてもよい。これらアルミニウム、アルミニウム化合物
でも、ホウフッ化物含有廃液と塩化第２鉄廃液の同時処
理、および処理率の向上が認められた。[Discussion] The ferric ion in the ferric chloride waste liquid is reduced by the reaction with iron powder to form ferrous ion,
Furthermore, it becomes hydroxide and precipitates. Aluminum hydroxide itself has a low solubility, but by being placed in the reaction in which ferric ion is reduced to ferrous ion, it becomes easier to dissolve in the waste liquid, for unknown reasons. It is considered that the borofluoride complex is decomposed and precipitated as calcium fluoride by lime milk. In this way, by mixing the ferric chloride waste liquid with the borofluoride-containing waste liquid, the decomposition of the borofluoride complex is promoted, and it can be precipitated as calcium fluoride. The amount of aluminum hydroxide added is important. As is clear from Examples 1 to 6 and Comparative Examples 1 and 2, 70 wt% or more of the amount of fluorine is effective, and optimally 80 wt% or more is preferable. Even if added excessively, no significant difference in processing time was observed (Example 6). In comparison with this, the addition amounts of the ferric chloride waste liquid and the iron powder affect the treatment time. That is, as is clear from Table 1, if the amount of aluminum hydroxide added is a predetermined amount or more, the treatment time is shortened as the amount of the ferric chloride waste liquid and the iron powder added increases. It should be noted that the reaction temperature was not heated and was a natural rising temperature, but the temperature did not rise so much, and the heat-resistant structure of the reaction tank was almost unnecessary. Although not as effective as aluminum hydroxide, aluminum or aluminum compounds such as aluminum sulfate and sodium aluminate may be used. Even with these aluminum and aluminum compounds, simultaneous treatment of the borofluoride-containing waste liquid and the ferric chloride waste liquid and improvement of the treatment rate were observed.
【００１９】[0019]
【発明の効果】本発明によれば、上述したように、ホウ
フッ化物含有廃液と塩化第２鉄廃液とを同時に処理で
き、かつ有害イオンの除去を高度に達成できる。しかも
反応温度は低温であり、装置の簡易化、作業の安全化が
図れる。According to the present invention, as described above, the borofluoride-containing waste liquid and the ferric chloride waste liquid can be treated at the same time, and the harmful ions can be highly removed. Moreover, since the reaction temperature is low, the apparatus can be simplified and the work can be made safe.
Claims (3)
もしくはアルミニウム化合物、塩化第２鉄廃液、および
鉄粉を加えて反応させ、該反応物にカルシウム化合物を
添加して中和することを特徴とするホウフッ化物含有廃
液の処理方法。1. A borofluoride characterized by adding aluminum or an aluminum compound, ferric chloride waste liquid, and iron powder to a borofluoride-containing waste liquid for reaction, and adding a calcium compound to the reaction product for neutralization. Method of treating waste fluid containing chloride.
ムであることを特徴とする請求項１記載のホウフッ化物
含有廃液の処理方法。2. The method for treating a borofluoride-containing waste liquid according to claim 1, wherein the aluminum compound is aluminum hydroxide.
化物含有廃液中のフッ素量の７０ｗｔ％以上、好ましく
は８０ｗｔ％以上添加することを特徴とする請求項２記
載のホウフッ化物含有廃液の処理方法。3. The method for treating a borofluoride-containing waste liquid according to claim 2, wherein the amount of aluminum hydroxide added is 70 wt% or more, preferably 80 wt% or more, of the amount of fluorine in the borofluoride-containing waste liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16125793A JPH0811231B2 (en) | 1993-06-30 | 1993-06-30 | Treatment method for waste liquid containing borofluoride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16125793A JPH0811231B2 (en) | 1993-06-30 | 1993-06-30 | Treatment method for waste liquid containing borofluoride |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0716577A true JPH0716577A (en) | 1995-01-20 |
| JPH0811231B2 JPH0811231B2 (en) | 1996-02-07 |
Family
ID=15731658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16125793A Expired - Lifetime JPH0811231B2 (en) | 1993-06-30 | 1993-06-30 | Treatment method for waste liquid containing borofluoride |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0811231B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100441405B1 (en) * | 2001-11-01 | 2004-07-23 | 한국과학기술연구원 | A method for anion removal by forming chemical precipitation under an electric field and a continuous process for anion removal |
| CN113060802A (en) * | 2021-04-16 | 2021-07-02 | 兰州交通大学 | A device and method for treating fluoroborate wastewater |
-
1993
- 1993-06-30 JP JP16125793A patent/JPH0811231B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100441405B1 (en) * | 2001-11-01 | 2004-07-23 | 한국과학기술연구원 | A method for anion removal by forming chemical precipitation under an electric field and a continuous process for anion removal |
| CN113060802A (en) * | 2021-04-16 | 2021-07-02 | 兰州交通大学 | A device and method for treating fluoroborate wastewater |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0811231B2 (en) | 1996-02-07 |
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