JPH0315513B2 - - Google Patents
Info
- Publication number
- JPH0315513B2 JPH0315513B2 JP25219083A JP25219083A JPH0315513B2 JP H0315513 B2 JPH0315513 B2 JP H0315513B2 JP 25219083 A JP25219083 A JP 25219083A JP 25219083 A JP25219083 A JP 25219083A JP H0315513 B2 JPH0315513 B2 JP H0315513B2
- Authority
- JP
- Japan
- Prior art keywords
- concentrated
- tank
- treating
- solution
- bath
- 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
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 11
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 9
- 239000000920 calcium hydroxide Substances 0.000 claims description 9
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 9
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 9
- 239000006228 supernatant Substances 0.000 claims description 7
- 239000000706 filtrate Substances 0.000 claims description 5
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 2
- 239000001110 calcium chloride Substances 0.000 claims description 2
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims 1
- 239000011593 sulfur Substances 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 16
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 11
- 229910052731 fluorine Inorganic materials 0.000 description 11
- 239000011737 fluorine Substances 0.000 description 11
- 239000000243 solution Substances 0.000 description 11
- 239000002351 wastewater Substances 0.000 description 9
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 fluoride ions Chemical class 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 235000001630 Pyrus pyrifolia var culta Nutrition 0.000 description 1
- 240000002609 Pyrus pyrifolia var. culta Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- PANBYUAFMMOFOV-UHFFFAOYSA-N sodium;sulfuric acid Chemical compound [Na].OS(O)(=O)=O PANBYUAFMMOFOV-UHFFFAOYSA-N 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Removal Of Specific Substances (AREA)
Description
〔発明の背景と目的〕
本発明はほうふつ化物を使用するめつき、前処
理、等で発生する濃厚排液の処理方法に関する。
ほうふつ化物を使用する半田めつき、錫めつ
き、前処理等より出る排液には、有害なほうふつ
化物イオンが多量に含まれているので、このよう
な排液を排棄するにはこれを無公害化処理するこ
とが必要であるが、これらのほうふつ化物イオン
の処理技術には次の如き二つの難点がある。一つ
は、BF4 -（ほうふつ化物イオン）が非常に安定で
あるから、これをF-（ふつ素イオン）に分解する
処理で長時間高温処理を必要とすることである。
他の一つは、F-の沈降に使用するCa（OH）2との
反応で生じる不溶性のCaFが0.0015ｇ／程度の
溶解度を持つていることで、このことは、理論ま
で反応を進めばふつ素濃度が15ppmになるという
ことである。一方、ふつ素の公害規制値は、全国
一律の排水基準では15ppm以下、茨城県条例では
8ppm以下、山梨県条例では1ppm以下等となつて
おり、上記理論値より厳しい規制になつている。
このような状況に対処するためには、多段回収槽
を設置し、常時発生する水洗水排水のほう素濃度
を1ppmに押えることが必要である。多段回収で
水洗水のふつ素濃度を1ppm以下に維持するには
排出量の低減と、あけ替頻度を多く取る設定とに
よつて行われる。あけ替頻度を増せば、第１段の
回収槽からめつき槽へのリターンが排出量以上と
なり、濃縮または一部の廃液処理が必要となる。
また、ふつ素の濃厚液は、極板の洗浄、装置の洗
浄老化液の廃棄等でも発生してくる。従つて、こ
のような濃厚なふつ素を含む廃液の処理が必要と
なる。
本発明の目的は、ほうふつ化物浴の濃厚溶液の
排水処理に際し、これをクローズドシステムとな
し、ふつ素を含む排水を排出しないようなほうふ
つ化物浴からの排液処理方法を提供するにある。
〔発明の概要〕
本発明は、ほうふつ化物浴の濃厚排液を硫酸ば
んど、消石灰、塩化カルシウム等の処理薬品の溶
液で処理することによる濃厚排液の処理方法にお
いて、前記排液と前記処理薬品の溶液との反応完
了後に得られる上澄液または濾液をフイードバツ
クして前記処理薬品の溶解に使用することを特徴
とするほうふつ化物浴の濃厚排液の処理方法であ
る。
本発明によるときは、前記のように排液に関し
てはクローズドシステムとなつているので、ほう
素含有排水は系外には排出されず、従来技術の如
き面倒な排水処理が不要となる。
〔実施例〕
以下、第１図に示す本発明の一実施例について
説明する。
１は濃厚液貯槽であつて、ほうふつ化物浴から
のほうふつ化物の濃厚排液が貯えられる。該排液
を反応槽２に供給し、消石灰（Ca（OH）2）槽７
から消石灰の水溶液、硫酸ばんど（Al2（SO4）3）
槽８から硫酸ばんどの水溶液を反応槽２に供給
し、かくはん下に反応を行わせ、CaFとCaSO4の
沈澱とふつ素を含む液を生成し、反応液をデカン
ター３に供給する。デカンターでCaFとCaSO4は
沈降してデカンター３の下部から取り出され、フ
イルタープレス６に濾過され、固形物はスラツジ
として排出される。
一方、フイルタープレスからのふつ素含有濾液
は、貯槽５に貯えられる。また、前記デカンター
３のふつ素含有上澄液は、上澄液抜きバルブ４を
通つて前記貯槽５の前述の濾液と共に貯えられ
る。貯槽５に貯えられた前記濾過液と上澄液を、
本発明に従つて前記消石灰槽７及び硫酸ばんど槽
にもどし、夫々の薬品を溶解する溶媒として用
い、得られた溶液を反応槽２に送り、濃厚液貯槽
１から濃厚液との反応を行わせる。本発明ではこ
のように貯槽５からの上澄液等を硫酸ばんどや消
石灰を溶解するのに用い、その溶液を反応槽に送
つて濃厚液との反応に供することをフイードバツ
クと称している。
本発明におけるほうふつ化物浴の濃厚排液のク
ローズドシステムは次のような条件で行うのが好
ましい。
すなわち、反応槽２中における反応におけるふ
つ素、硫酸ばんど、及び消石灰の量については化
学反応式より次のように計算される。
Ｆ：Al2（SO4）3：Ca（OH）2＝１：14.2：6.97
但し、Ca（OH）2については反応系のPHを上げ
る目的も有しているので実際にはこの量の２倍量
を加えている。従つて、実際には
Ｆ：Al2（SO4）3：Ca（OH）2＝１：14.2：13.94
で運転される。この比を用いて薬品使用量と溶解
液との関係を求めると次のようになる。（但し濃
厚液１m3の処理とした）
BACKGROUND AND OBJECTS OF THE INVENTION The present invention relates to a method for treating concentrated waste liquid generated during plating, pretreatment, etc. using borosilicate. Wastewater from soldering, tinning, pretreatment, etc. that uses fluoride contains a large amount of harmful fluoride ions, so it is necessary to use this method to dispose of such wastewater. Although it is necessary to treat them to make them non-polluting, the treatment techniques for these fluoride ions have the following two drawbacks. One is that since BF 4 - (fluoride ion) is extremely stable, the process of decomposing it into F - (fluoride ion) requires long-term high-temperature treatment.
Another reason is that the insoluble CaF produced by the reaction with Ca(OH) 2 used for precipitation of F - has a solubility of about 0.0015 g/kg, which means that if the reaction progresses to the theoretical level, This means that the fluorine concentration will be 15 ppm. On the other hand, the pollution regulation value for fluorine is 15 ppm or less according to the nationwide wastewater standards, and according to the Ibaraki Prefectural Ordinance.
The limit is 8ppm or less, and the Yamanashi Prefectural Ordinance requires it to be 1ppm or less, which is a stricter regulation than the theoretical value above.
In order to deal with this situation, it is necessary to install multistage recovery tanks and keep the boron concentration in the constantly generated washing water wastewater to 1 ppm. In order to maintain the fluorine concentration in the wash water at 1 ppm or less through multi-stage recovery, this is done by reducing the amount of discharge and increasing the frequency of replacement. If the frequency of replacement is increased, the amount returned from the first-stage recovery tank to the plating tank will exceed the amount discharged, and it will be necessary to concentrate or treat some of the waste liquid.
Concentrated fluorine solutions are also generated when cleaning electrode plates and disposing of aging cleaning solutions for equipment. Therefore, it is necessary to treat waste liquid containing such concentrated fluorine. An object of the present invention is to provide a method for treating waste water from a fluoride bath in which a concentrated solution of a fluoride bath is treated as a closed system and does not discharge waste water containing fluorine. [Summary of the Invention] The present invention provides a method for treating a concentrated effluent from a borosulfide bath by treating the concentrated effluent with a solution of treatment chemicals such as sulfuric acid, slaked lime, and calcium chloride. This is a method for treating concentrated effluent from a sulfur compound bath, characterized in that the supernatant liquid or filtrate obtained after the reaction with the chemical solution is completed is fed back and used for dissolving the treatment chemical. According to the present invention, since a closed system is used for drainage as described above, boron-containing wastewater is not discharged outside the system, and the troublesome wastewater treatment as in the prior art is not required. [Example] Hereinafter, an example of the present invention shown in FIG. 1 will be described. Reference numeral 1 denotes a concentrated liquid storage tank in which concentrated waste liquid of sulfate from the sulfate bath is stored. The waste liquid is supplied to the reaction tank 2, and the slaked lime (Ca(OH) 2 ) tank 7
Aqueous solution of slaked lime, sulfuric acid band (Al 2 (SO 4 ) 3 )
An aqueous solution of sodium sulfuric acid is supplied from the tank 8 to the reaction tank 2 and reacted with stirring to produce a solution containing precipitates of CaF and CaSO 4 and fluorine, and the reaction solution is supplied to the decanter 3. CaF and CaSO 4 settle in the decanter and are taken out from the bottom of the decanter 3, filtered into a filter press 6, and the solids are discharged as sludge. On the other hand, the fluorine-containing filtrate from the filter press is stored in the storage tank 5. Further, the fluorine-containing supernatant in the decanter 3 passes through a supernatant drain valve 4 and is stored together with the filtrate in the storage tank 5. The filtrate and supernatant liquid stored in the storage tank 5,
According to the present invention, the slaked lime tank 7 and the sulfuric acid band tank are returned to the slaked lime tank 7 and the sulfuric acid band tank is used as a solvent for dissolving the respective chemicals, and the resulting solution is sent to the reaction tank 2 where it is reacted with the concentrated liquid from the concentrated liquid storage tank 1. let In the present invention, the process of using the supernatant liquid etc. from the storage tank 5 to dissolve sulfuric acid and slaked lime, and sending the solution to the reaction tank where it is reacted with the concentrated liquid is called "feedback". The closed system for concentrated drainage of the borosulfide bath in the present invention is preferably carried out under the following conditions. That is, the amounts of fluorine, sulfuric acid, and slaked lime in the reaction in the reaction tank 2 are calculated as follows from the chemical reaction equation. F: Al 2 (SO 4 ) 3 : Ca(OH) 2 = 1:14.2: 6.97 However, since Ca(OH) 2 also has the purpose of increasing the pH of the reaction system, this amount of 2 Adding double the amount. Therefore, it is actually operated at a ratio of F:Al 2 (SO 4 ) 3 :Ca(OH) 2 = 1:14.2:13.94. Using this ratio, the relationship between the amount of chemicals used and the solution is determined as follows. (However, 1 m3 of concentrated liquid was treated)
本発明によるときは、クローズドシステムをは
かることができるので、次のような効果がある。
１ ふつ素を含む排液が系外に排出されないから
公害問題に対する有効な解決手段をみることが
できる。
２ 従来の如き、排液を河川投棄するための面倒
な処理が不要となるので経済的である。
３ 処理薬品の濃度と供給量を適当に選べば処理
薬品を溶解供給するための水は最初に用いるた
めでよく、次後は処理によつて生じた液を循環
して用いるだけでもよい。
４ 自動化、無人化をはかることができる。
According to the present invention, since a closed system can be implemented, the following effects can be obtained. 1. Since wastewater containing fluorine is not discharged outside the system, it can be seen as an effective solution to the pollution problem. 2. It is economical because the troublesome process of disposing of wastewater into a river as in the past is unnecessary. 3. If the concentration and supply amount of the processing chemicals are appropriately selected, water for dissolving and supplying the processing chemicals may be used initially, and thereafter, the liquid produced by the processing may be simply circulated and used. 4. Can be automated and unmanned.
第１図は本発明の工程の一例を示す説明図であ
る。
１……濃厚液貯槽、２……反応槽、３……デカ
ンター、４……上澄液抜きバルブ、５……貯槽、
６……フイルタープレス、７……消石灰槽、８…
…硫酸ばんど槽。
FIG. 1 is an explanatory diagram showing an example of the process of the present invention. 1... concentrated liquid storage tank, 2... reaction tank, 3... decanter, 4... supernatant liquid removal valve, 5... storage tank,
6... Filter press, 7... Slaked lime tank, 8...
...Sulfuric acid band tank.
Claims (1)
の溶液で処理することによる濃厚排液の処理方法
において、前記排液と前記処理薬品の溶液との反
応終了後に得られる上澄液または濾液をフイード
バツクして前記処理薬品の溶解に使用することを
特徴とするほうふつ化物浴の濃厚排液の処理方
法。 ２ 処理薬品が硫酸ばんど、消石灰、及び塩化カ
ルシウムの少くとも一種よりなる特許請求の範囲
第１項に記載ほうふつ化物浴の濃厚排液の処理方
法。[Scope of Claims] 1. A method for treating a concentrated effluent by treating a ``concentrated effluent of a borosilicate bath'' with a solution of a treatment chemical, which is obtained after the reaction between the effluent and the solution of the treatment chemical. A method for treating concentrated effluent from a sulfur bath, characterized in that the supernatant or filtrate is fed back and used for dissolving the treatment chemicals. 2. The method for treating concentrated effluent from a sulfide bath as set forth in claim 1, wherein the treatment chemical comprises at least one of sulfuric acid, slaked lime, and calcium chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25219083A JPS60143886A (en) | 1983-12-28 | 1983-12-28 | How to dispose of concentrated wastewater from a sulfur compound bath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25219083A JPS60143886A (en) | 1983-12-28 | 1983-12-28 | How to dispose of concentrated wastewater from a sulfur compound bath |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60143886A JPS60143886A (en) | 1985-07-30 |
| JPH0315513B2 true JPH0315513B2 (en) | 1991-03-01 |
Family
ID=17233749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25219083A Granted JPS60143886A (en) | 1983-12-28 | 1983-12-28 | How to dispose of concentrated wastewater from a sulfur compound bath |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60143886A (en) |
-
1983
- 1983-12-28 JP JP25219083A patent/JPS60143886A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60143886A (en) | 1985-07-30 |
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