JPS6231995B2 - - Google Patents
Info
- Publication number
- JPS6231995B2 JPS6231995B2 JP22675082A JP22675082A JPS6231995B2 JP S6231995 B2 JPS6231995 B2 JP S6231995B2 JP 22675082 A JP22675082 A JP 22675082A JP 22675082 A JP22675082 A JP 22675082A JP S6231995 B2 JPS6231995 B2 JP S6231995B2
- Authority
- JP
- Japan
- Prior art keywords
- calcium fluoride
- wastewater
- fluorine
- acid
- crystals
- 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
Links
Landscapes
- Removal Of Specific Substances (AREA)
Description
本発明は、弗素系成分を含有する廃水の処理方
法に関する。
弗素系成分を含有する廃水は、アルミニウム工
業、窯業、肥料工業、めつき工業、半導体工業、
ごみ焼却工場の排ガス湿式洗浄廃水（いわゆる洗
煙廃水）等から発生する。これらの設備からの廃
水中には弗素の他にシリコン等が含まれており、
弗素の形態にはF-の他にSiF6 2-等が考えられ
る。
このような弗素系成分を含有する廃水の処理方
法として、CaCl2、Ca（OH）2等のCa塩を用いた
カルシウム凝沈法、鉄およびアルミニウム凝沈
法、燐酸アパタイト法などの凝集沈殿法ととも
に、吸着法、イオン交換法、電解法、逆浸透法な
どの物理化学的処理法がある。
しかしカルシウム凝沈法は、弗素の除去率が不
十分であるとともに、CaCl2、Ca（OH）2等のCa
塩が高い。また鉄およびアルミニウム凝沈法は、
コストがかさむとともに、廃棄スラツジが増加す
る。更に燐酸アパタイト法は、除去率は高いが、
燐酸の薬剤費が高いことが挙げられる。また物理
化学的処理法は、いずれも弗素を濃縮除去する方
法であり、最終的に濃縮された弗素の再処理を必
要とする欠点がある。
本発明は上記事情に鑑みてなされたもので、そ
の目的とするところは、工程が簡単でしかも処理
コストの極めて安価な弗素系成分含有廃水の処理
方法を得んとするものである。
すなわち本発明は、弗素系成分含有廃水に含有
弗素量の当量比10倍以上の二水石膏を加えかつPH
を4.0〜5.5に保持して難溶性の弗化カルシウムを
生成する工程と、弗化カルシウムを生成した廃水
を過する工程と、弗化カルシウムを生成した廃
水又は弗化カルシウムを別除去した液に弗化
カルシウム結晶又はその酸リーチング物を接触せ
しめる工程とを具備したことを特徴とする。
また難溶性の弗化カルシウムを生成する工程
と、弗化カルシウム結晶等を接触させる工程とを
同一反応槽でおこなうこと、及び弗化カルシウム
を別除去した液に対し、弗化カルシウム結晶
等を接触させること、更には液に弗化カルシウ
ム結晶等を接触させた過することをそれぞれ実
施態様とする。
以下本発明を図示する実施例を参照して説明す
る。第１図は、弗素系成分含有廃水の処理方法の
一例を示す。この処理方法は、反応槽１内に弗素
系成分含有廃水２を入れ、二水石膏３及び塩酸等
の酸４を添加し、更に運転開始時に蛍石等の弗化
カルシウム結晶又はその酸リーチング物（以下、
弗化カルシウム結晶５と言う）を供給する。
二水石膏３は、CaCl2、CaCO3、Ca（OH）2等
よりはるかに安価な脱弗素用カルシウム塩で、弗
素と反応して難溶性の弗化カルシウム（CaF2）を
生成する。この際二水石膏３の添加量は、廃水２
中に含有する弗素量の当量比10倍以上とし、好ま
しくは10倍〜50倍とする。この理由は、10倍未満
では難溶性の弗化カルシウムが生成され難いため
で、又添加量が多すぎてもその効果が飽和してし
まうためである。
酸４は反応槽１内をPH4.0〜5.5、好ましくはPH
4.5±0.5に保持するために添加する。この範囲に
保持するのは、PH4.0未満では弗素はHF又はHF2
を形成してF-として解離し難く、又PH5.5を越え
るとOH-がF-の解離に妨害を与え、弗化カルシ
ウムが形成され難くなるためである。
一方弗化カルシウム結晶５は、この表面に弗化
カルシウムを析出形成するために供給する。すな
わち本発明は二水石膏３を添加することにより、
Ca2+とF-とを反応させて難溶性の弗化カルシウ
ム（溶解度積4.9×10-11）を生成するものである
が、反応槽１中には、弗化カルシウム粒子の他
に、過剰のCa2+と過飽和のF-が共存している。
そこでこれらイオンを弗化カルシウム結晶５と接
触させて、弗化カルシウムをその表面に析出形成
する。この場合、弗化カルシウム結晶の表面を硫
酸、塩酸等でリーチングしたものは、結晶表面に
新たな活性面が形成されるため、とくに有効であ
る。この場合反応槽１での滞留時間は、30分程度
十分である。
次いで反応槽１で生成した弗化カルシウムを含
むスラリを過機６で過する。別した弗化カ
ルシウムの一部７は、反応槽１に循環して投入さ
れ、残部７′は回収される。また弗化カルシウム
を別除去した処理水８は、系外に排出される。
この処理方法によれば、二水石膏３で難溶性の
弗化カルシウムを生成し、さらに弗化カルシウム
結晶５の表面に弗化カルシウムを析出するので、
処理水８中の弗素濃度を低くすることができる。
次に第２図に示す本発明の他の処理方法につき
説明する。この処理方法は、反応槽１内に弗素系
成分含有廃水２を入れ、二水石膏３を廃水含有弗
素量の当量比10倍以上を添加し、更に酸４を加え
てPH4.0〜5.5とし、難溶性の弗化カルシウムを生
成する。次いで反応槽１から排出されたスラリ９
を過機６で過し、弗化カルシウム７を別除
去する。弗化カルシウム７を別除去した液１
０は、充填塔１１に入る。充填塔１１には、弗化
カルシウム結晶５又はその酸リーチング物が充填
され、これと液が接触することにより、液中
のF-を弗化カルシウムとして析出除去する。こ
のようにして弗化カルシウムを除去した処理水８
には、弗素が極めて少なく、これを系外に排出す
ることができる。
次に第３図に示す本発明の他の処理方法につき
説明する。この処理方法は、反応槽１内に弗素系
成分含有廃水２を入れ、二水石膏３を廃水含有弗
素量の当量比10倍以上を添加し、更に酸４を加え
てPH4.0〜5.5とし、難溶性の弗化カルシウムを生
成する。次いで反応槽１から排出されたスラリ９
を過機６で過し、弗化カルシウム７を別除
去する。弗化カルシウム７を別除去した液１
０は、添加槽１２に入る。添加槽１２では、弗化
カルシウム結晶５又はその酸リーチング物が添加
され、これと液が接触することにより、液中
のF-が弗化カルシウムとして析出する。そして
この液を過機１３に入れ弗化カルシウム７を
別回収する。また弗化カルシウム７を別除去
した処理水８には、弗素が極めて少なく、これを
系外に排出する。
次に本発明の実験例及び実施例につき説明す
る。
実験例 １
原水として試薬のNaFとNa2SiF6とをH2Oに溶
解した合成液（F-＝20mg／、SiF6 2-＝20mg／
、全Ｆ量＝40mg／）を供試し、二水石膏を原
水中弗素に対する当量比で１、５、10、30、50添
加し、HCl又はNaOHでPHを3.5、4.0、4.5、5.0、
5.5、6.0に調整して弗化カルシウムを沈殿生成
し、これを過後、液中に残存する弗素濃度を
測定した。その結果を第１表に示す。なお原水量
は１、反応時間は30分とした。
The present invention relates to a method for treating wastewater containing fluorine-based components. Wastewater containing fluorine components is used in the aluminum industry, ceramic industry, fertilizer industry, plating industry, semiconductor industry,
It is generated from exhaust gas wet cleaning wastewater (so-called smoke washing wastewater) of garbage incineration plants. The wastewater from these facilities contains silicon, etc. in addition to fluorine.
Possible forms of fluorine include SiF 6 2- in addition to F - . Treatment methods for wastewater containing such fluorine-based components include calcium coagulation using Ca salts such as CaCl 2 and Ca(OH) 2 , iron and aluminum coagulation, and coagulation-sedimentation methods such as the phosphoapatite method. In addition, there are physicochemical treatment methods such as adsorption, ion exchange, electrolysis, and reverse osmosis. However, the calcium coagulation method has an insufficient removal rate of fluorine and also removes calcium such as CaCl 2 and Ca(OH) 2.
Salt is expensive. Also, the iron and aluminum precipitation method
This increases costs and increases waste sludge. Furthermore, although the phosphoric acid apatite method has a high removal rate,
One example is the high cost of phosphoric acid. In addition, all of the physicochemical treatment methods are methods for concentrating and removing fluorine, and have the disadvantage that the concentrated fluorine finally needs to be reprocessed. The present invention has been made in view of the above circumstances, and its object is to provide a method for treating fluorine-based component-containing wastewater with simple steps and extremely low treatment cost. That is, in the present invention, dihydrate gypsum is added to wastewater containing fluorine components in an equivalent ratio of 10 times or more to the amount of fluorine contained, and the PH
4.0 to 5.5 to produce poorly soluble calcium fluoride, a step of filtering the wastewater that has produced calcium fluoride, and a step of filtering the wastewater that has produced calcium fluoride or the liquid from which calcium fluoride has been separately removed. The method is characterized by comprising a step of bringing into contact with calcium fluoride crystals or an acid-leached product thereof. In addition, the step of producing poorly soluble calcium fluoride and the step of contacting calcium fluoride crystals, etc. are carried out in the same reaction tank, and calcium fluoride crystals, etc. are brought into contact with the solution from which calcium fluoride has been separately removed. Embodiments include allowing the liquid to contact the liquid with calcium fluoride crystals or the like. The present invention will be described below with reference to illustrative embodiments. FIG. 1 shows an example of a method for treating wastewater containing fluorine components. In this treatment method, fluorine-containing wastewater 2 is placed in a reaction tank 1, gypsum dihydrate 3 and an acid 4 such as hydrochloric acid are added, and at the start of operation, calcium fluoride crystals such as fluorite or acid-leached substances thereof are added. (below,
Calcium fluoride crystals 5) are supplied. Gypsum dihydrate 3 is a calcium salt for defluorination that is much cheaper than CaCl 2 , CaCO 3 , Ca(OH) 2 , etc., and reacts with fluorine to produce sparingly soluble calcium fluoride (CaF 2 ). At this time, the amount of gypsum dihydrate 3 added is
The equivalent ratio of the amount of fluorine contained therein is 10 times or more, preferably 10 times to 50 times. The reason for this is that if the amount is less than 10 times, hardly soluble calcium fluoride is hardly produced, and if the amount added is too large, the effect will be saturated. Acid 4 has a pH of 4.0 to 5.5, preferably PH in reaction tank 1.
Add to maintain at 4.5±0.5. To maintain this range, below PH4.0, fluorine is HF or HF2
This is because it forms and is difficult to dissociate as F - , and when the pH exceeds 5.5, OH - interferes with the dissociation of F - , making it difficult to form calcium fluoride. On the other hand, calcium fluoride crystals 5 are supplied to deposit calcium fluoride on this surface. That is, in the present invention, by adding dihydrate gypsum 3,
Ca 2+ and F - are reacted to produce poorly soluble calcium fluoride (solubility product: 4.9×10 -11 ), but in reaction tank 1, in addition to calcium fluoride particles, there is Ca 2+ and supersaturated F - coexist.
Then, these ions are brought into contact with the calcium fluoride crystals 5, and calcium fluoride is precipitated and formed on the surface thereof. In this case, leaching the surface of calcium fluoride crystals with sulfuric acid, hydrochloric acid, etc. is particularly effective because a new active surface is formed on the crystal surface. In this case, the residence time in the reaction tank 1 is sufficient for about 30 minutes. Next, the slurry containing calcium fluoride produced in the reaction tank 1 is passed through a filter 6. A portion 7 of the separated calcium fluoride is circulated and introduced into the reaction tank 1, and the remaining portion 7' is recovered. The treated water 8 from which calcium fluoride has been separately removed is discharged outside the system. According to this treatment method, sparingly soluble calcium fluoride is generated from the dihydrate gypsum 3, and calcium fluoride is further precipitated on the surface of the calcium fluoride crystals 5.
The fluorine concentration in the treated water 8 can be lowered. Next, another processing method of the present invention shown in FIG. 2 will be explained. In this treatment method, fluorine-containing wastewater 2 is placed in a reaction tank 1, gypsum dihydrate 3 is added at an equivalent ratio of at least 10 times the amount of fluorine contained in the wastewater, and acid 4 is further added to adjust the pH to 4.0 to 5.5. , producing poorly soluble calcium fluoride. Then, the slurry 9 discharged from the reaction tank 1
is passed through a filter 6 to separately remove calcium fluoride 7. Liquid 1 from which calcium fluoride 7 was separately removed
0 enters the packed column 11. The packed tower 11 is filled with calcium fluoride crystals 5 or acid-leached products thereof, and by contacting the crystals with the liquid, F - in the liquid is precipitated and removed as calcium fluoride. Treated water from which calcium fluoride was removed in this way 8
contains extremely little fluorine, which can be discharged from the system. Next, another processing method of the present invention shown in FIG. 3 will be explained. In this treatment method, fluorine-containing wastewater 2 is placed in a reaction tank 1, gypsum dihydrate 3 is added at an equivalent ratio of at least 10 times the amount of fluorine contained in the wastewater, and acid 4 is further added to adjust the pH to 4.0 to 5.5. , producing poorly soluble calcium fluoride. Then, the slurry 9 discharged from the reaction tank 1
is passed through a filter 6 to separately remove calcium fluoride 7. Liquid 1 from which calcium fluoride 7 was separately removed
0 enters the addition tank 12. In the addition tank 12, calcium fluoride crystals 5 or acid-leached products thereof are added, and when the liquid comes into contact with the crystals, F - in the liquid is precipitated as calcium fluoride. Then, this liquid is put into a filter 13 and the calcium fluoride 7 is separately recovered. Furthermore, the treated water 8 from which the calcium fluoride 7 has been separately removed contains extremely little fluorine, and is discharged outside the system. Next, experimental examples and examples of the present invention will be explained. Experimental example 1 A synthetic solution in which the reagents NaF and Na 2 SiF 6 were dissolved in H 2 O (F - = 20 mg/, SiF 6 2 - = 20 mg/
, total F amount = 40 mg/), dihydrate gypsum was added at an equivalent ratio of 1, 5, 10, 30, 50 to fluorine in the raw water, and the pH was adjusted to 3.5, 4.0, 4.5, 5.0, with HCl or NaOH.
Calcium fluoride was precipitated by adjusting the concentration to 5.5 and 6.0, and after passing through this, the concentration of fluorine remaining in the liquid was measured. The results are shown in Table 1. The amount of raw water was 1, and the reaction time was 30 minutes.
【表】
上表から二水石膏添加量（×当量比）10以上、
PH4.0〜5.5で残存弗素濃度が10mg／以下とな
り、脱弗素効果が優れていることがわかる。
実施例 １
原水としてごみ焼却工場の洗煙廃水Ａ（PH
7.8、弗素濃度38mg／）を供試し、第１図に示
す装置で弗素処理実験を行つた。
この場合、実験No.1として原水1000mlに二水
石膏1.72ｇ（当量比×10）添加し、同時に蛍石
（100メツシユパス）を60ｇ加えて、HClにてPHを
4.5に調整しつつ30分撹拌混合した。その後ヌツ
チエ型過器にて定圧過（−400mmHg、紙は
東洋紙No.2）し、液中の弗素濃度を測定し
た。
また実験No.2として、実験No.1の蛍石の代わ
りに蛍石60ｇを10W／Ｖ％のH2SO4300mlで処理
した後、過及び水洗浄した得られたケーキを用
いて同様な実験を行なつた。この結果液中の弗
素濃度は、No.1で5.2mg／、No.2で5.0mg／で
あつた。
実施例 ２
原水としてごみ焼却工場洗煙廃水Ａ（PH7.8、
弗素濃度38mg／）を供試し、第２図に示す装置
で連続処理実験を行なつた。この場合原水処理量
５／時、二水石膏の添加量8.58ｇ／時（当量比
×10）、反応槽PH4.5±0.2、滞留時間30分、過
器はヌツチエ型定圧過（−400mmHg、紙は東
洋紙No.2）、充填塔は、弗化カルシウム充填部
200ml、弗化カルシウム結晶は蛍石の粉砕物（14
メツシユ〜20メツシユ）とし、SV＝25とした。
８時間の連続実験の結果、充填塔入口で弗素濃
度7.6mg／、同出口（処理水）で弗素濃度5.3
mg／であつた。
実施例 ３
原水としてごみ焼却工場洗煙廃水Ｂ（PH7.6、
弗素濃度191mg／）を供試し、第３図に示す装
置でバツチ処理実験を行なつた。
すなわち原水1000mlに二水石膏8.65ｇ（当量比
×10）を添加し、HClにてPH4.5±0.2に保持しつ
つ30分反応させた後実施例１と同様に過した。
次にこの液800mlに蛍石の粉砕物（100メツシユ
パス）50ｇを添加して30分混合後、前と同様に
過した。
そして蛍石添加前の液と最終処理水について
弗素濃度を分析したところ、前者は7.1mg／、
後者は5.4mg／であつた。
なお本発明では、二水石膏を添加したが、半水
石膏、無水石膏を用いても同様の効果を得る。ま
た実施例では、合成液、洗煙廃水についての実験
結果を述べたが、他の弗素系含有廃水についても
適用できることは勿論である。
以上説明したように本発明によれば、廃水中の
弗素を効率よく高度に処理することができ、しか
も生成した弗化カルシウムを効率よく回収再利用
することができる顕著な効果を奏する。[Table] From the table above, the amount of dihydrate added (x equivalent ratio) is 10 or more,
At pH 4.0 to 5.5, the residual fluorine concentration is less than 10mg/, which indicates that the fluoride removal effect is excellent. Example 1 Smoke washing wastewater A (PH
7.8, fluorine concentration of 38 mg/) was used, and a fluorine treatment experiment was conducted using the apparatus shown in Figure 1. In this case, as experiment No. 1, 1.72 g of dihydrate gypsum (equivalence ratio x 10) was added to 1000 ml of raw water, and at the same time, 60 g of fluorite (100 mesh) was added, and the pH was adjusted with HCl.
The mixture was stirred and mixed for 30 minutes while adjusting the temperature to 4.5. Thereafter, the solution was subjected to constant pressure (-400 mmHg, paper used was Toyo Paper No. 2) using a Nutsuchie filter, and the fluorine concentration in the solution was measured. In addition, as Experiment No. 2, 60 g of fluorite was treated with 300 ml of 10 W/V% H 2 SO 4 instead of the fluorite used in Experiment No. 1, and the resulting cake was washed with filtration and water. I conducted an experiment. As a result, the fluorine concentration in the liquid was 5.2 mg/in No. 1 and 5.0 mg/in No. 2. Example 2 Waste incineration factory smoke washing wastewater A (PH7.8,
A continuous treatment experiment was conducted using the apparatus shown in Figure 2 using a fluorine concentration of 38 mg/). In this case, the amount of raw water treated is 5/hour, the amount of dihydrate gypsum added is 8.58 g/hour (equivalent ratio x 10), the reaction tank pH is 4.5 ± 0.2, the residence time is 30 minutes, and the filter is a Nutstier type constant pressure filter (-400 mmHg, The paper is Toyo Paper No. 2), and the packing tower is calcium fluoride filling section.
200ml, calcium fluoride crystals are crushed fluorite (14
20 meshes), and SV = 25. As a result of an 8-hour continuous experiment, the fluorine concentration was 7.6 mg/day at the inlet of the packed column, and 5.3 mg/day at the outlet (treated water).
mg/. Example 3 Waste incineration factory smoke washing wastewater B (PH7.6,
A batch treatment experiment was conducted using the apparatus shown in Figure 3 using a fluorine concentration of 191 mg/). That is, 8.65 g of dihydrate gypsum (equivalent ratio x 10) was added to 1000 ml of raw water, and the mixture was reacted for 30 minutes while maintaining the pH at 4.5±0.2 with HCl, followed by the same procedure as in Example 1.
Next, 50 g of crushed fluorite (100 mesh passes) was added to 800 ml of this liquid, mixed for 30 minutes, and filtered in the same manner as before. When we analyzed the fluorine concentration of the liquid before adding fluorite and the final treated water, we found that the former was 7.1mg/,
The latter was 5.4 mg/. In the present invention, gypsum dihydrate is added, but similar effects can be obtained by using gypsum hemihydrate or gypsum anhydrite. Further, in the examples, experimental results were described for synthetic liquids and smoke washing wastewater, but it goes without saying that the present invention can also be applied to other fluorine-containing wastewaters. As explained above, according to the present invention, fluorine in wastewater can be efficiently and highly treated, and the produced calcium fluoride can be efficiently recovered and reused, which is a remarkable effect.
第１図〜第３図は本発明のそれぞれ異なる弗素
系成分含有廃水の処理方法を示す説明図である。
１……反応槽、２……弗素系成分含有廃水、３
……二水石膏、４……酸、５……弗化カルシウム
結晶（又はこの酸リーチング物）、６……過
機、７，７′……弗化カルシウム、８……処理
水、９……スラリ、１０……液、１１……充填
塔、１２……添加槽、１３……過機。
FIGS. 1 to 3 are explanatory diagrams showing different methods of treating fluorine-containing component-containing wastewater according to the present invention. 1...Reaction tank, 2...Fluorine component-containing wastewater, 3
...Gypsum dihydrate, 4...Acid, 5...Calcium fluoride crystals (or this acid-leached product), 6...Peroxidase, 7,7'...Calcium fluoride, 8...Treated water, 9... ...Slurry, 10...Liquid, 11...Packed tower, 12...Addition tank, 13...Performer.
Claims (1)
倍以上の二水石膏を加えかつPHを4.0〜5.5に保持
して難溶性の弗化カルシウムを生成する工程と、
弗化カルシウムを生成した廃水を過する工程
と、弗化カルシウムを生成した廃水又は弗化カル
シウムを別除去した液に弗化カルシウム結晶
又はその酸リーチング物を接触せしめる工程とを
具備したことを特徴とする弗素系成分含有廃水の
処理方法。 ２ 難溶性の弗化カルシウムを生成する工程と、
弗化カルシウムを生成した廃水に弗化カルシウム
結晶又はその酸リーチング物を接触せしめる工程
とを同一反応槽内でおこなうことを特徴とする特
許請求の範囲第１項記載の弗素系成分含有廃水の
処理方法。 ３ 難溶性の弗化カルシウムを生成する工程後、
弗化カルシウムを生成した廃水を過する工程を
おこない、しかる後弗化カルシウムを別除去し
た液を弗化カルシウム結晶又はその酸リーチン
グ物を充填した充填塔に入れて接触せしめる工程
をおこなうことを特徴とする特許請求の範囲第１
項記載の弗素系成分含有廃水の処理方法。 ４ 難溶性の弗化カルシウムを生成する工程後、
弗化カルシウムを別除去した液を添加槽に入
れて弗化カルシウム結晶又はその酸リーチング物
と接触せしめる工程をおこない、しかる後この廃
水を過して弗化カルシウムを別除去する工程
をおこなうことを特徴とする特許請求の範囲第１
項記載の弗素系成分含有廃水の処理方法。[Claims] 1. Equivalence ratio of fluorine content in wastewater containing fluorine components: 10
A step of adding more than double the amount of gypsum and maintaining the pH between 4.0 and 5.5 to produce poorly soluble calcium fluoride;
It is characterized by comprising a step of filtering wastewater that has produced calcium fluoride, and a step of bringing calcium fluoride crystals or an acid-leached product thereof into contact with the wastewater that has produced calcium fluoride or a liquid from which calcium fluoride has been separately removed. A method for treating wastewater containing fluorine components. 2. A step of producing poorly soluble calcium fluoride;
The treatment of fluorine-based component-containing wastewater according to claim 1, characterized in that the step of bringing calcium fluoride crystals or an acid-leached product into contact with the wastewater that has produced calcium fluoride is carried out in the same reaction tank. Method. 3 After the step of producing poorly soluble calcium fluoride,
It is characterized by carrying out a step of filtering the wastewater that has produced calcium fluoride, and then carrying out a step of putting the liquid from which calcium fluoride has been separately removed into a packed tower filled with calcium fluoride crystals or an acid-leached product thereof and bringing them into contact with each other. Claim No. 1
A method for treating wastewater containing fluorine components as described in . 4 After the step of producing poorly soluble calcium fluoride,
A process is carried out in which the liquid from which calcium fluoride has been separately removed is placed in an addition tank and brought into contact with calcium fluoride crystals or its acid leached product, and then this wastewater is passed through to carry out a process in which calcium fluoride is separately removed. Characteristic claim 1
A method for treating wastewater containing fluorine components as described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22675082A JPS59120286A (en) | 1982-12-27 | 1982-12-27 | Treatment method for wastewater containing fluorine components |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22675082A JPS59120286A (en) | 1982-12-27 | 1982-12-27 | Treatment method for wastewater containing fluorine components |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59120286A JPS59120286A (en) | 1984-07-11 |
| JPS6231995B2 true JPS6231995B2 (en) | 1987-07-11 |
Family
ID=16850018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22675082A Granted JPS59120286A (en) | 1982-12-27 | 1982-12-27 | Treatment method for wastewater containing fluorine components |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59120286A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01114099U (en) * | 1988-01-29 | 1989-08-01 |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59193191A (en) * | 1983-04-18 | 1984-11-01 | Hitachi Plant Eng & Constr Co Ltd | Treatment method for wastewater containing fluoride ions |
| JP2005021855A (en) * | 2003-07-02 | 2005-01-27 | Japan Organo Co Ltd | Crystallization method of silicon/fluorine-containing wastewater |
| JP5049987B2 (en) * | 2009-02-25 | 2012-10-17 | 森田化学工業株式会社 | Fluorine ion immobilization and fluorine recycling method |
| CN108373140A (en) * | 2018-02-26 | 2018-08-07 | 中南大学 | A method of removing fluorine from sulfate liquor |
| CN112390419A (en) * | 2020-11-16 | 2021-02-23 | 合肥工业大学 | Method for treating high-concentration fluorine-containing wastewater and recovering fluorine |
-
1982
- 1982-12-27 JP JP22675082A patent/JPS59120286A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01114099U (en) * | 1988-01-29 | 1989-08-01 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59120286A (en) | 1984-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| YangM et al. | Fluoride removal in a fixed bed packed with granular calcite | |
| CN110330164A (en) | A kind of method of alkalinity high fluorine Sewage treatment fluorine resource and sodium resource with high salt | |
| JPS6231995B2 (en) | ||
| JP3112613B2 (en) | Treatment of wastewater containing fluorine and phosphorus | |
| JPH0712477B2 (en) | How to remove phosphorus in water | |
| JPH0592187A (en) | Fluorine-containing water treatment method | |
| KR20010108162A (en) | Method of removing calcium from water containing calcium hydrogen carbonate in high concentration | |
| JP4543482B2 (en) | Fluorine-containing water treatment method | |
| JP2004000846A (en) | Fluorine-containing water treatment method | |
| JPH05253575A (en) | Fluorine-containing water treatment method | |
| JP3238745B2 (en) | Method of treating ammonium fluoride-containing water | |
| JP3266309B2 (en) | Treatment method for acidic fluorine-containing water | |
| JP2003117564A (en) | Treatment method for wastewater containing fluorine | |
| JP3622407B2 (en) | Water treatment method | |
| JPH1057969A (en) | Fluorine-containing waste water treating device and its treatment | |
| JPS6231996B2 (en) | ||
| JPS6258795B2 (en) | ||
| JP4370745B2 (en) | Method for treating fluorine-containing water containing phosphate ions | |
| JPH10137744A (en) | Treatment of waste water containing fluorine | |
| JPS61118184A (en) | Treatment of purified water | |
| TW200304428A (en) | Method and apparatus for treating fluoro-containing water discharge | |
| JP3257063B2 (en) | Treatment method for fluorine-containing water | |
| RU2036844C1 (en) | Method of cleaning sewage water from fluorine | |
| JP2751875B2 (en) | Treatment method for wastewater containing fluorine | |
| RU2837084C1 (en) | Method of purifying waste water from fluorine |