JP2002143865A - Method for treating acidic waste liquid containing metal - Google Patents
Method for treating acidic waste liquid containing metalInfo
- Publication number
- JP2002143865A JP2002143865A JP2000346516A JP2000346516A JP2002143865A JP 2002143865 A JP2002143865 A JP 2002143865A JP 2000346516 A JP2000346516 A JP 2000346516A JP 2000346516 A JP2000346516 A JP 2000346516A JP 2002143865 A JP2002143865 A JP 2002143865A
- Authority
- JP
- Japan
- Prior art keywords
- waste liquid
- metal
- acidic waste
- treating
- metal hydroxide
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Removal Of Specific Substances (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋼板の酸洗やめっ
き廃液等の金属を溶解した酸性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 an acidic waste liquid in which metals such as a pickling steel sheet and a plating waste liquid are dissolved.
【０００２】[0002]
【従来の技術】従来、鋼板の圧延やめっき処理等を施す
際に、鋼板に付着した油脂やスケールを酸洗処理して除
去し、鋼板の表面に発生する疵やメッキ表面の汚れ等を
防止している。この酸洗処理やめっき処理は、塩酸、硝
酸、硝弗酸等を含む酸性の液を用いるため、鋼板中の
鉄、クロム、ニッケル等の金属を溶解した酸性廃液が発
生する。この酸性廃液は、アルカリ液を加えて中和処理
してから、凝集剤を添加してシックナー等の沈殿池（沈
殿槽）を利用して金属水酸化物を沈殿させてスラリーと
し、このスラリーを脱水処理してスラジに加工する。し
かし、これ等金属水酸化物は、粒子が小さくて沈殿速度
が遅く、スラリーを脱水処理した際に生成するスラジの
含水量も高く、使用する際スラジの乾燥が必要になる。
しかも、スラジは、多量に水を含んだ状態で搬送するた
め輸送費用が増加する等の問題がある。従って、特開平
４−２６７９９４号公報に記載されているように、予め
金属水酸化物を含む液を入れた沈殿池にアルカリ液と凝
集剤を混合した液を供給し、この沈殿池で沈殿した金属
水酸化物を含むスラリーを取り出し、このスラリーにア
ルカリ液を添加したものを中和処理槽の金属イオンを含
む酸性廃液に添加することが行われており、廃液の中和
処理によって生成する金属水酸化物の粒子を大きくし、
沈殿池での沈殿速度を高め、シックナー等の沈殿池の小
型化や処理効率の向上を図っている。2. Description of the Related Art Conventionally, when rolling or plating a steel sheet, the oils and scales attached to the steel sheet are removed by pickling to prevent scratches on the steel sheet surface and stains on the plating surface. are doing. Since this pickling treatment and plating treatment use an acidic liquid containing hydrochloric acid, nitric acid, nitric hydrofluoric acid, etc., an acidic waste liquid in which metals such as iron, chromium and nickel in the steel sheet are dissolved is generated. The acidic waste liquid is neutralized by adding an alkaline liquid, and then a coagulant is added thereto to precipitate a metal hydroxide using a sedimentation tank (sedimentation tank) such as a thickener to form a slurry. Dehydrated and processed into sludge. However, these metal hydroxides are small in particle size, have a low sedimentation rate, and have a high water content of sludge generated when the slurry is subjected to dehydration treatment, so that the sludge must be dried when used.
In addition, sludge is transported in a state of containing a large amount of water, and thus has a problem such as an increase in transportation cost. Therefore, as described in JP-A-4-267994, a solution in which an alkali solution and a coagulant are mixed is supplied to a sedimentation tank containing a liquid containing a metal hydroxide in advance, and the sedimentation is performed in the sedimentation tank. A slurry containing a metal hydroxide is taken out, and a slurry obtained by adding an alkali solution to the slurry is added to an acidic waste solution containing metal ions in a neutralization tank, and the metal generated by the neutralization treatment of the waste solution is performed. Larger hydroxide particles,
The sedimentation speed in the sedimentation basin is increased, and the size of the sedimentation basin such as a thickener and the treatment efficiency are improved.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、特開平
４−２６７９９４号公報に記載された方法では、金属水
酸化物の粒子をある程度大きくできるが、その結合は、
主に高分子凝集剤によって粒子と粒子を凝集させるた
め、攪拌等の弱い力が付与された際に、金属水酸化物の
塊が容易に分離し、大きい金属水酸化物の粒子を安定し
て形成することができず、凝集剤等の薬剤コストが上昇
する。しかも、粒子中の金属水酸化物の密度が小さく、
且つ、粒子が容易に壊れるため、沈殿した金属水酸化物
の粒子を含むスラリーを脱水処理した際に、スラジの含
水量が５５〜７０重量％と高くなる。従って、粒子の密
度をさほど高くできないことから、沈殿池（沈殿槽）で
の沈殿速度も遅くなり、シックナー等の沈殿池が大きく
なったり、沈殿や脱水処理等の効率が低下する等の問題
がある。However, according to the method described in Japanese Patent Application Laid-Open No. Hei 4-267994, the metal hydroxide particles can be enlarged to some extent.
Because the particles are mainly agglomerated by the polymer flocculant, when a weak force such as stirring is applied, the lump of the metal hydroxide is easily separated, and the large metal hydroxide particles are stably formed. It cannot be formed, and the cost of chemicals such as flocculants increases. Moreover, the density of the metal hydroxide in the particles is small,
In addition, since the particles are easily broken, when the slurry containing the precipitated metal hydroxide particles is subjected to a dehydration treatment, the water content of the sludge increases to 55 to 70% by weight. Therefore, since the density of the particles cannot be increased so much, the sedimentation speed in the sedimentation basin (sedimentation tank) becomes slow, and the sedimentation basin such as a thickener becomes large, and the efficiency of sedimentation and dehydration treatment decreases. is there.
【０００４】本発明はかかる事情に鑑みてなされたもの
で、金属水酸化物の密度の高い大きい粒子を形成して沈
殿速度を速め、脱水の処理効率が高く、低水分のスラジ
にすることができる金属を含む酸性廃液の処理方法を提
供することを目的とする。The present invention has been made in view of such circumstances, and it is possible to form large particles having a high density of metal hydroxide to increase the sedimentation rate, to increase the efficiency of dehydration treatment, and to obtain a sludge with a low moisture content. It is an object of the present invention to provide a method for treating an acidic waste liquid containing a metal.
【０００５】[0005]
【課題を解決するための手段】前記目的に沿う本発明の
金属を含む酸性廃液の処理方法は、金属イオンを含む酸
性廃液を連続して容器内に供給しながら、前記酸性廃液
を中和処理して金属水酸化物の粒子を析出させ、前記容
器内を攪拌して該金属水酸化物に前記金属イオンを接触
させることにより前記金属水酸化物を大きい粒子にして
から脱水処理を行う。この方法により、酸性廃液を攪拌
して、中和処理によって析出する小さい金属水酸化物の
粒子の表面に、酸性廃液中の金属イオンを積極的に接触
させるので、金属水酸化物の表面に金属を析出させた
り、ある程度大きくなった粒子同士が接触した際に、粒
子と粒子の接触面に金属イオンが接触して金属が析出す
ることにより、粒子結合を促進することができる。そし
て、金属水酸化物の粒子を大きくして、その粒子の密度
を高くでき、金属水酸化物の沈殿速度を高め、脱水し易
くすることができる。According to the present invention, there is provided a method of treating an acidic waste liquid containing a metal according to the present invention, wherein the acidic waste liquid is neutralized while continuously supplying an acidic waste liquid containing metal ions into a container. Then, the metal hydroxide particles are precipitated, and the inside of the container is stirred, and the metal hydroxide is brought into contact with the metal ion to make the metal hydroxide into large particles and then subjected to a dehydration treatment. According to this method, the acidic waste liquid is stirred and the metal ions in the acidic waste liquid are positively brought into contact with the surfaces of the small metal hydroxide particles precipitated by the neutralization treatment. When particles are deposited or when particles that have grown to a certain extent come into contact with each other, metal ions come into contact with the contact surfaces of the particles to precipitate the metal, thereby promoting particle bonding. The metal hydroxide particles can be enlarged to increase the density of the particles, increase the precipitation rate of the metal hydroxide, and facilitate dehydration.
【０００６】ここで、前記中和処理では、前記酸性廃液
にアルカリ液を添加してｐＨを４〜１０にすることが好
ましい。これにより、酸性廃液中に溶解している金属イ
オンを金属水酸化物の粒子として析出させることができ
る。ｐＨが４より小さいと、酸性廃液中に溶解している
金属イオンの析出が不十分になり、溶液中に多くの金属
イオンが残存するため、処理後の水質が悪化する。一
方、ｐＨが１０より高くなると、酸性廃液中に溶解して
いる金属イオンの析出を促進できるが、中和剤の使用量
が増加し、処理コストが高くなる。Here, in the neutralization treatment, it is preferable that an alkaline solution is added to the acidic waste liquid to adjust the pH to 4 to 10. Thereby, the metal ions dissolved in the acidic waste liquid can be precipitated as metal hydroxide particles. If the pH is less than 4, the precipitation of metal ions dissolved in the acidic waste liquid becomes insufficient, and a large amount of metal ions remain in the solution. On the other hand, when the pH is higher than 10, the precipitation of metal ions dissolved in the acidic waste liquid can be promoted, but the amount of the neutralizing agent used increases and the treatment cost increases.
【０００７】更に、前記酸性廃液を中和処理を行った後
に、前記容器内の水の一部を分離膜を用いて除去するこ
とが好ましい。これにより、酸性廃液中に含まれる過剰
の水分を除去できるので、金属水酸化物の粒子の含有量
が高くなり、金属水酸化物と金属イオンの接触を良好に
行うことができ、金属水酸化物の粒子の成長を図ること
ができる。しかも、処理液中の金属水酸化物の粒子の濃
度を高くしているので、処理液の脱水処理を効率良く行
うことができる。Further, it is preferable that after performing the neutralization treatment of the acidic waste liquid, a part of the water in the container is removed using a separation membrane. As a result, excess water contained in the acidic waste liquid can be removed, so that the content of the metal hydroxide particles increases, and the metal hydroxide and the metal ions can be brought into good contact with each other. The particles of the object can be grown. In addition, since the concentration of the metal hydroxide particles in the treatment liquid is increased, the treatment liquid can be efficiently dehydrated.
【０００８】また、前記分離膜の孔径を１〜１００μｍ
にすると良い。分離膜の孔径が１μｍより小さいと、金
属水酸化物の細かい粒子が詰って脱水が不十分になる。
一方、孔径が１００μｍより大きくなると、分離膜の孔
をそのまま通過する粒子が増加し、脱水処理後の排水の
水質が悪化する。The pore size of the separation membrane is 1 to 100 μm.
It is good to If the pore size of the separation membrane is smaller than 1 μm, fine particles of metal hydroxide are clogged and dehydration becomes insufficient.
On the other hand, when the pore diameter is larger than 100 μm, the number of particles passing through the pores of the separation membrane as it is increases, and the water quality of the wastewater after the dehydration treatment deteriorates.
【０００９】更に、前記酸性廃液を中和処理して生成し
た中和処理液の一部を沈殿槽に供給して余剰水を除去す
ることができる。中和処理によって生成した金属水酸化
物や金属イオンと接触して大きくなった金属水酸化物を
沈殿槽によって沈殿させ、金属水酸化物を含まない余剰
水を排出することができる。Further, a part of the neutralized liquid produced by neutralizing the acidic waste liquid can be supplied to a precipitation tank to remove excess water. The metal hydroxide, which has grown by contact with the metal hydroxide or metal ion generated by the neutralization treatment, is precipitated in the sedimentation tank, and surplus water containing no metal hydroxide can be discharged.
【００１０】また、前記酸性廃液には、製鉄工場の鋼板
の酸洗廃液あるいはめっき廃液を用いることができる。
金属イオンを多く含む廃液を中和処理するので、金属水
酸化物の粒子を多く析出でき、しかも、多量に含まれる
金属イオンを接触させて、金属水酸化物の粒子の成長と
粒子密度を高めることができる。[0010] Further, as the acidic waste liquid, a pickling waste liquid or a plating waste liquid of a steel plate in an ironworks can be used.
Neutralization of waste liquid containing a large amount of metal ions allows precipitation of a large amount of metal hydroxide particles, and increases the growth and particle density of metal hydroxide particles by contacting a large amount of metal ions. be able to.
【００１１】[0011]
【発明の実施の形態】続いて、添付した図面を参照しつ
つ、本発明を具体化した実施の形態につき説明し、本発
明の理解に供する。図１は本発明の第１の実施の形態に
係る金属を含む酸性廃液の処理方法に適用される廃液処
理装置の全体図、図２は処理経過時間と金属水酸化物濃
度の関係を表すグラフ、図３は廃液処理槽の運転日数と
金属水酸化物の粒子径の関係を表すグラフ、図４は本発
明の第２の実施の形態に係る金属を含む酸性廃液の処理
方法に適用される廃液処理装置の全体図、図５は脱水時
間と濾水量の関係を表すグラフである。図１に示すよう
に、本発明の第１の実施の形態に係る金属を含む酸性廃
液の処理方法に適用される廃液処理装置１０は、製鉄工
場で圧延された薄鋼板を塩酸、硝酸、硝弗酸等の酸液で
酸洗処理した後の酸洗廃液２２（酸性廃液の一例）を一
旦貯蔵する廃液タンク１１と、廃液タンク１１に設けた
ポンプ１２から酸洗廃液２２を受けいれる容器の一例で
ある廃液処理槽１３と、廃液処理槽１３内にポンプ１４
を用いてカセイソーダ、あるいは生石灰、消石灰等を溶
かしたアルカリ液を添加するためのアルカリ液タンク１
５と、廃液処理槽１３内に生成した金属水酸化物を含む
中和処理液２４をスラリーとして吸引するスラリーポン
プ１６と圧送した中和処理液２４を脱水する脱水装置１
７を有している。廃液処理槽１３の底部には、中和処理
を行って生成した中和処理液２４を攪拌するために、気
体の吹き込み孔１９を複数設け、気体供給管１８ａに連
通した筒状のパイプ１８が配置されており、更に、中和
処理した後の余剰の水を除去する分離膜の一例である膜
モジュール２０が廃液処理槽１３の下側部に備えられて
いる。膜モジュール２０は、ポリプロピレンからなる素
材を用い、孔径が１〜１００μｍで、通気量が１２００
ｃｍ3 ／ｃｍ2 ・分となる孔を有し、図示しない負圧装
置にパイプ２１を介して連通している。更に、廃液処理
槽１３の上方には、廃液処理槽１３内のｐＨ計２５、ス
ラリー濃度計２３を備えている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is an overall view of a waste liquid treatment apparatus applied to a method for treating a metal-containing acidic waste liquid according to a first embodiment of the present invention, and FIG. 2 is a graph showing a relationship between treatment elapsed time and metal hydroxide concentration. FIG. 3 is a graph showing the relationship between the number of operating days of the waste liquid treatment tank and the particle size of the metal hydroxide, and FIG. 4 is applied to a method for treating an acidic waste liquid containing metals according to the second embodiment of the present invention. FIG. 5 is an overall view of a waste liquid treatment apparatus, and FIG. 5 is a graph showing a relationship between a dehydration time and a drainage amount. As shown in FIG. 1, a waste liquid treatment apparatus 10 applied to a method for treating an acidic waste liquid containing a metal according to a first embodiment of the present invention is a method for treating a thin steel sheet rolled in an iron making plant with hydrochloric acid, nitric acid, and nitric acid. An example of a waste liquid tank 11 for temporarily storing a pickling waste liquid 22 (an example of an acidic waste liquid) after being pickled with an acid solution such as hydrofluoric acid, and an example of a container that receives the pickling waste liquid 22 from a pump 12 provided in the waste liquid tank 11 And a pump 14 in the waste liquid treatment tank 13.
Alkaline solution tank 1 for adding alkaline solution in which caustic soda, quick lime, slaked lime, etc. is dissolved using
5, a slurry pump 16 for sucking a neutralization treatment liquid 24 containing metal hydroxide generated in the waste liquid treatment tank 13 as a slurry, and a dewatering device 1 for dehydrating the neutralized treatment liquid 24 fed under pressure.
7. A plurality of gas injection holes 19 are provided at the bottom of the waste liquid treatment tank 13 for stirring the neutralization treatment liquid 24 generated by performing the neutralization treatment, and a cylindrical pipe 18 communicating with a gas supply pipe 18a is provided. Further, a membrane module 20 which is an example of a separation membrane for removing excess water after the neutralization treatment is provided on the lower side of the waste liquid treatment tank 13. The membrane module 20 is made of a material made of polypropylene, has a pore size of 1 to 100 μm, and has an air permeability of 1200.
It has a hole of cm 3 / cm 2 · minute and communicates with a negative pressure device (not shown) via a pipe 21. Further, a pH meter 25 and a slurry concentration meter 23 in the waste liquid treatment tank 13 are provided above the waste liquid treatment tank 13.
【００１２】次に、本発明の第１の実施の形態に係る金
属を含む酸性廃液の処理方法について説明する。製鉄工
場で圧延された薄鋼板を酸洗処理した後の酸洗廃液２２
を貯蔵した廃液タンク１１からポンプ１２を作動して酸
洗廃液２２を廃液処理槽１３内に６００ｍ 3 ／Ｈｒで連
続して供給を行う。この酸洗廃液２２は、ｐＨが２以下
で、Ｆｅ、Ｚｎ、Ｃｒ、Ｎｉ等を０．０１〜１重量％溶
解しており、これ等の金属は、金属イオンとして存在し
ている。酸洗廃液２２の供給と同時に、アルカリ液タン
ク１５に連通したポンプ１４を作動して１〜２ｍ3 ／Ｈ
ｒでアルカリ液を廃液処理槽１３内に添加して酸洗廃液
２２を中和処理し、金属水酸化物の粒子が析出した中和
処理液２４を生成する。この中和処理は、ｐＨ計２５の
指針を見ながらアルカリ液を添加し、ｐＨ４〜１０にな
るように行う。そして、アルカリ液の添加を開始してか
ら、筒状のパイプ１８に設けた複数の吹き込み孔１９か
ら気体の一例である空気を６４Ｎｍ3 ／Ｈｒ吹き込ん
で、中和処理液２４を攪拌する。Next, the gold according to the first embodiment of the present invention will be described.
A method for treating an acidic waste liquid containing a genus will be described. Ironsmith
Pickling waste liquid 22 after pickling treatment of a steel sheet rolled in a mill
Pump 12 is operated from waste liquid tank 11 storing
The washing waste liquid 22 is 600 m in the waste liquid treatment tank 13. Three / Hr
Then, supply is performed. This pickling waste liquid 22 has a pH of 2 or less.
To dissolve 0.01 to 1% by weight of Fe, Zn, Cr, Ni, etc.
These metals exist as metal ions
ing. At the same time as the supply of the pickling waste liquid 22,
Activate the pump 14 that communicates with theThree / H
Add the alkaline solution into the waste liquid treatment tank 13 at r
22 is neutralized, and metal hydroxide particles are precipitated.
The processing liquid 24 is generated. This neutralization is performed by the pH meter 25.
Add an alkaline solution while watching the guidelines to adjust the pH to 4-10.
To do so. And start adding alkali solution
From the plurality of blow holes 19 provided in the cylindrical pipe 18,
64Nm of air which is an example of gasThree / Hr blow
Then, the neutralized solution 24 is stirred.
【００１３】そして、図２に示すように、中和処理の経
過時間と共に、廃液処理槽１３内の金属水酸化物の量を
増加させることができる。更に、中和処理液２４が生成
される際に、連続して酸洗廃液２２を廃液処理槽１３内
に供給しているので、酸洗廃液２２中に含まれる金属イ
オンが、中和作用によるｐＨの上昇に伴ってその溶解度
が低下して金属水酸化物として析出し、この金属水酸化
物の表面に更に金属イオンが接触したり、金属水酸化物
の粒子同士の接触面あるいは隙間に金属イオンが接して
金属が析出すること等により、金属水酸化物の粒子が大
きくなる。その結果、図３に示すように、廃液処理槽１
３の運転日数が長くなるにつれて、中和処理時のｐＨが
４．０の場合（□）、ｐＨが６．５の場合（△）、中和
処理時のｐＨが１０（■）の場合において、いずれも金
属水酸化物の粒子の成長が促進され、それぞれ粒子径を
６．５μｍ、３．７μｍ、３．０μｍに大きくすること
ができた。更に、このようにして生成した金属水酸化物
は、金属を析出させて大きく（３〜２０μｍ）している
ため、粒子が緻密であり、しかも、沈殿し易くなってい
る。Then, as shown in FIG. 2, the amount of metal hydroxide in the waste liquid treatment tank 13 can be increased with the lapse of the neutralization treatment. Further, since the pickling waste liquid 22 is continuously supplied into the waste liquid treatment tank 13 when the neutralized liquid 24 is generated, the metal ions contained in the pickling waste liquid 22 are neutralized. As the pH increases, its solubility decreases and precipitates as a metal hydroxide, and metal ions come into contact with the surface of the metal hydroxide, or the metal hydroxide adheres to the contact surface or gap between the metal hydroxide particles. Particles of the metal hydroxide become larger due to, for example, deposition of the metal upon contact with the ions. As a result, as shown in FIG.
As the number of operating days of 3 becomes longer, when the pH during the neutralization treatment is 4.0 (□), when the pH is 6.5 (６), and when the pH during the neutralization treatment is 10 (■), In each case, the growth of the metal hydroxide particles was promoted, and the particle diameters could be increased to 6.5 μm, 3.7 μm, and 3.0 μm, respectively. Further, the metal hydroxide thus formed is large (3 to 20 μm) by precipitating a metal, so that the particles are dense and easy to precipitate.
【００１４】中和処理過程では、酸洗廃液２２が連続し
て供給されるため、廃液処理槽１３内の中和処理液２４
が増加する。従って、中和処理を行った後、負圧装置に
連通したパイプ２１から負圧で吸引することにより、中
和処理液２４の余剰水６００ｍ3 ／Ｈｒを膜モジュール
２０で濾過して除去する。この膜モジュール２０を用い
て濾過する際に、膜モジュール２０の表面に中和処理液
２４に含まれる金属水酸化物の粒子が付着する。この付
着物は、時間の経過と共に厚くなるため、吹き込み孔１
９から吹き込んだ空気によって発生する中和処理液２４
の流れが、膜モジュール２０の表面を洗う流れ（クロス
流）を形成し、膜モジュール２０の表面の過剰な付着物
を除去できる。その結果、膜モジュール２０の性能を損
なうことなく、連続して余剰水の濾過を行うことができ
る。中和処理が所定時間を経過すると、廃液処理槽１３
内の中和処理液２４が濃縮されるので、スラリー濃度計
２３で測定し、金属水酸化物の濃度が１０〜５０重量％
に到達した時点で、空気の吹き込みのみを継続した状態
で、金属水酸化物を多く含む中和処理液２４、すなわち
スラリーをポンプ１６で吸引し、一般に用いられるフィ
ルタープレス等の脱水装置１７に圧送して脱水処理を行
う。このスラリーは、金属水酸化物の粒子が緻密で、し
かも、粒子が大きいため、脱水装置１７による脱水効率
が格段に向上し、含水率が５０重量％以下の低水分の金
属水酸化物（スラジ）にすることができる。脱水処理さ
れたスラジは、トラックやベルトコンベア等で搬送さ
れ、製鉄原料やレンガ原料等に利用される。In the neutralization process, since the pickling waste liquid 22 is continuously supplied, the neutralization liquid 24 in the waste liquid treatment tank 13 is supplied.
Increase. Therefore, after performing the neutralization treatment, 600 m 3 / Hr of the excess water of the neutralization treatment liquid 24 is removed by filtration with the membrane module 20 by suctioning with a negative pressure from the pipe 21 communicating with the negative pressure device. At the time of filtration using the membrane module 20, particles of the metal hydroxide contained in the neutralization solution 24 adhere to the surface of the membrane module 20. This deposit becomes thicker with the passage of time.
Neutralization treatment liquid 24 generated by air blown from 9
Forms a flow (cross flow) for washing the surface of the membrane module 20, and can remove excess deposits on the surface of the membrane module 20. As a result, it is possible to continuously filter the excess water without impairing the performance of the membrane module 20. After a predetermined period of time for the neutralization treatment, the waste liquid treatment tank 13
Since the neutralized solution 24 in the inside is concentrated, the concentration of the metal hydroxide is measured by the slurry concentration meter 23 to be 10 to 50% by weight.
Is reached, the neutralization treatment liquid 24 containing a large amount of metal hydroxide, that is, the slurry is suctioned by the pump 16 while only the air blowing is continued, and is fed to the dehydrating device 17 such as a generally used filter press. To perform a dehydration treatment. In this slurry, the metal hydroxide particles are dense and the particles are large, so that the dehydration efficiency of the dehydrator 17 is remarkably improved, and the metal hydroxide having a low water content of 50% by weight or less (slurry). ). The dewatered sludge is conveyed by a truck, a belt conveyor, or the like, and is used as a raw material for ironmaking, a raw material for bricks, or the like.
【００１５】次に、本発明の第２の実施の形態に係る金
属を含む酸性廃液の処理方法について説明する。本発明
の第２の実施の形態に係る金属を含む酸性廃液の処理方
法に使用される廃液処理装置３０は、第１の実施の形態
における廃液処理槽１３の膜モジュール２０による余剰
水の除去にかえて沈殿槽を用いた場合であり、第１の実
施の形態の廃液処理装置１０と同一の部分には、同一の
符号を付し、その詳細な説明は省略する。図４に示すよ
うに、廃液処理装置３０は、ポンプ１２から供給される
酸洗廃液２２と、ポンプ１４を介してアルカリ液タンク
１５から供給されるアルカリ液を受け入れる容器の一例
である中和処理槽３１と、上方と下方が中和処理槽３１
に連通するようにして配置した仕切り板３２で区画され
た沈殿槽３３を設けている。更に、沈殿槽３３には、中
和処理槽３１の上方から溢れた中和処理液３６の流れを
抑制する整流板３４と、余剰水を排水するための排水管
３５を設けており、沈殿槽３３の下方には、中和処理液
３６から沈殿して金属水酸化物を多量に含むスラリーを
吸引するスラリーポンプ１６と圧送したスラリーを脱水
する脱水装置１７を備えている。Next, a method for treating an acidic waste liquid containing metals according to a second embodiment of the present invention will be described. The waste liquid treatment apparatus 30 used in the method for treating an acidic waste liquid containing metals according to the second embodiment of the present invention is used for removing excess water by the membrane module 20 of the waste liquid treatment tank 13 in the first embodiment. This is the case where a sedimentation tank is used instead, and the same parts as those of the waste liquid treatment apparatus 10 of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. As shown in FIG. 4, the waste liquid treatment device 30 is a neutralization treatment that is an example of a container that receives the pickling waste liquid 22 supplied from the pump 12 and the alkaline liquid supplied from the alkaline liquid tank 15 via the pump 14. The tank 31 and the upper and lower parts are the neutralization tank 31
A sedimentation tank 33 is provided, which is partitioned by a partition plate 32 arranged so as to communicate with the tank. Further, the sedimentation tank 33 is provided with a rectifying plate 34 for suppressing the flow of the neutralization liquid 36 overflowing from above the neutralization tank 31 and a drain pipe 35 for draining excess water. A slurry pump 16 that sucks a slurry that precipitates from the neutralization treatment liquid 36 and contains a large amount of metal hydroxide, and a dewatering device 17 that dewaters the pressure-fed slurry are provided below 33.
【００１６】次に、本発明の第２の実施の形態に係る金
属を含む酸性廃液の処理方法について説明する。製鉄工
場で圧延された薄鋼板を酸洗処理した後の酸洗廃液２２
を貯蔵した廃液タンク１１からポンプ１２を作動して酸
洗廃液２２を中和処理槽３１内に６００ｍ 3 ／Ｈｒで連
続して供給を行う。酸洗廃液２２の供給と同時に、アル
カリ液タンク１５に連通したポンプ１４を作動して１〜
２ｍ3 ／Ｈｒのアルカリ液を中間処理槽３１内に添加し
て酸洗廃液２２を中和して、中和処理液３６を生成す
る。この中和処理は、ｐＨ計２５の指針を見ながらアル
カリ液を添加し、ｐＨが４〜１０となるように行われ
る。そして、アルカリ液の添加を開始してから、筒状の
パイプ１８に設けた複数の吹き込み孔１９から空気を６
４Ｎｍ3 ／Ｈｒ吹き込んで、中和処理液３６を攪拌す
る。酸洗廃液２２を中和処理槽３１に連続して供給して
いるので、中和処理槽３１内の中和処理液３６が増加
し、仕切り板３２の上方から沈殿槽３３内に溢れ、この
溢れ流を整流板３４によって下向きの整流にしてから中
和処理槽３１に向かう流れにすることができ、仕切り板
３２の上方から中和処理槽３１に向かう循環流が形成さ
れる。Next, according to the second embodiment of the present invention,
A method for treating an acidic waste liquid containing a genus will be described. Ironsmith
Pickling waste liquid 22 after pickling treatment of a steel sheet rolled in a mill
Pump 12 is operated from waste liquid tank 11 storing
The washing waste liquid 22 is 600 m in the neutralization tank 31. Three / Hr
Then, supply is performed. Simultaneously with the supply of the pickling waste liquid 22,
Activate the pump 14 communicating with the potash solution tank 15 to
2mThree / Hr alkaline solution into the intermediate treatment tank 31
The pickling waste liquid 22 is neutralized to produce a neutralized liquid 36.
You. This neutralization treatment is performed while watching the pH meter 25 guidelines.
Potash solution is added and the pH is adjusted to 4-10.
You. Then, after starting the addition of the alkali solution,
Air is blown through a plurality of blow holes 19 provided in the pipe 18.
4NmThree / Hr to stir the neutralization solution 36
You. The pickling waste liquid 22 is continuously supplied to the neutralization tank 31.
, The amount of neutralization liquid 36 in the neutralization tank 31 increases.
Then, it overflows into the sedimentation tank 33 from above the partition plate 32,
After the overflow is straightened downward by the straightening plate 34,
The flow can be directed to the sum processing tank 31 and the partition plate
32, a circulating flow is formed toward the neutralization tank 31 from above.
It is.
【００１７】仕切り板３２と沈殿槽３３の整流板３４の
間に流入して下向き流れを形成した中和処理液３６は、
その一部が沈殿槽３３内に流入し、中和処理液３６に含
まれる金属水酸化物が沈降し、清浄された余剰水が沈殿
槽３３の上方側部に設けた排水管３５から系外に排出さ
れて中和処理液３６の水位を一定に保持する。また、中
和処理液３６内には、連続して酸洗廃液２２が供給され
ており、しかも、吹き込み孔１９から吹き込まれる空気
によって全体が攪拌されているので、酸洗廃液２２中に
含まれる金属イオンが中和作用によるｐＨの上昇に伴っ
て、その溶解度が低下して析出して金属水酸化物の粒子
となり、更に金属水酸化物の表面に金属イオンが接触し
たり、金属水酸化物の粒子同士の接触面あるいは隙間に
金属イオンが析出して粒子同士を接合することにより、
金属水酸化物の粒子が大きくなり、しかも、金属水酸化
物の粒子を緻密にすることができる。そして、沈殿槽３
３では、金属水酸化物が沈殿し、金属水酸化物の濃化し
たスラリーになる。このスラリーは、沈殿槽３３の下方
に設けたスラリーポンプ１６で吸引され、脱水装置１７
により脱水される。The neutralization liquid 36 flowing between the partition plate 32 and the rectifying plate 34 of the settling tank 33 to form a downward flow is
A part of the water flows into the sedimentation tank 33, the metal hydroxide contained in the neutralization treatment liquid 36 is settled, and excess purified water is discharged from the drainage pipe 35 provided on the upper side of the sedimentation tank 33. And the water level of the neutralization liquid 36 is kept constant. Further, in the neutralization treatment liquid 36, the pickling waste liquid 22 is continuously supplied, and furthermore, the whole is agitated by the air blown from the blowing holes 19, so that it is contained in the pickling waste liquid 22. As the pH of the metal ions increases due to the neutralization action, the solubility of the metal hydroxide decreases and the metal ions precipitate and become metal hydroxide particles. By depositing metal ions on the contact surface or gap between the particles and joining the particles,
The metal hydroxide particles become large, and the metal hydroxide particles can be made dense. And settling tank 3
In 3, the metal hydroxide precipitates and becomes a slurry in which the metal hydroxide is concentrated. This slurry is sucked by a slurry pump 16 provided below the sedimentation tank 33,
Dehydrated.
【００１８】[0018]
【実施例】次に、本発明の一実施例に係る金属を含む酸
性廃液の処理方法について説明する。圧延された薄鋼板
を酸洗処理した後のｐＨが２以下で、三価のイオンＦｅ
を０．３重量％溶解した酸洗廃液を廃液処理槽内に６０
０ｍＬ／分で連続して供給を行いながら、廃液処理槽に
カセイソーダを添加して中和処理しｐＨが７．８の中和
処理液に調整した。中和処理と同時に、廃液処理槽の底
部から空気を６ＮＬ／分吹き込んで、中和処理液を攪拌
し、酸洗廃液の連続供給による余剰水を膜モジュールを
用いて濾過して系外に排出した。中和処理液に含まれる
金属水酸化物の濃度が３０重量％になった時点で、スラ
リーポンプを作動して中和処理液を脱水装置に圧送して
脱水処理を行い、脱水時間と濾水量を調査した。図５に
示すように、本実施例（■で示す）では、脱水を開始し
てから３０秒で濾水量が１５０ｍＬ以上と良好であっ
た。そして、脱水処理後の金属水酸化物の水分や濾布の
状態についても調査した結果、脱水処理後の金属水酸化
物の水分が４０重量％以下と極めて良好であり、濾布の
目詰まりが無く優れた効果が得られた。これに対し、従
来法であるアルカリ液と凝集剤を酸洗廃液に添加してシ
ックナーで沈殿させた金属水酸化物の一部を返送して、
中和処理液に添加した場合（×で示す）では、脱水を開
始してから３０秒を経過した際の濾水量が１０ｍＬ以下
であり、３００秒を経過した濾水量が６０ｍＬと極めて
悪い結果となった。そして、脱水処理後の金属水酸化物
の水分や濾布の状態についても調査した結果、脱水処理
後の金属水酸化物の水分が５５重量％以上と高く、濾布
の目詰まりが発生していずれも悪い結果となった。Next, a method for treating an acidic waste liquid containing a metal according to an embodiment of the present invention will be described. PH after the pickling treatment of the rolled steel sheet is 2 or less, and the trivalent ion Fe
Acid solution was dissolved in a waste liquid treatment tank in an amount of 60% by weight.
While continuously supplying the solution at 0 mL / min, caustic soda was added to the waste liquid treatment tank to perform a neutralization treatment to adjust the pH to 7.8. At the same time as the neutralization treatment, air is blown at 6 NL / min from the bottom of the waste liquid treatment tank to stir the neutralization treatment liquid, and the surplus water due to continuous supply of the pickling waste liquid is filtered using a membrane module and discharged out of the system. did. When the concentration of the metal hydroxide contained in the neutralized solution reaches 30% by weight, the slurry pump is operated to pump the neutralized solution to a dehydrator to perform dehydration, and the dehydration time and the drainage amount investigated. As shown in FIG. 5, in this example (indicated by ■), the drainage amount was as good as 150 mL or more 30 seconds after the start of dehydration. The moisture content of the metal hydroxide after the dehydration treatment and the condition of the filter cloth were also investigated. As a result, the moisture content of the metal hydroxide after the dehydration treatment was very good at 40% by weight or less, and clogging of the filter cloth was suppressed. Excellent effect was obtained. In contrast, a conventional method of adding an alkali solution and a flocculant to the pickling waste liquid and returning a part of the metal hydroxide precipitated by the thickener,
When added to the neutralization solution (indicated by x), the amount of drainage after 30 seconds from the start of dehydration is 10 mL or less, and the amount of drainage after 300 seconds is 60 mL, which is extremely poor. became. As a result of investigating the water content of the metal hydroxide after the dehydration treatment and the condition of the filter cloth, the water content of the metal hydroxide after the dehydration treatment was as high as 55% by weight or more, and the filter cloth was clogged. Both had bad results.
【００１９】以上、本発明の実施の形態を説明したが、
本発明は、上記した形態に限定されるものでなく、要旨
を逸脱しない条件の変更等は全て本発明の適用範囲であ
る。例えば、金属水酸化物の粒子の濃度が高くなった中
和処理液は、脱水装置を用いた脱水の他に、ヤード等の
平地に搬送して天日乾燥を行うことができる。更に、酸
洗廃液の他に、めっき廃液を用いることができ、この場
合も酸洗廃液と同様の効果を得ることができる。また、
アルカリ液として、ＭｇＯ、Ｍｇ（ＯＨ）2 等を含む液
を用いることもできる。The embodiments of the present invention have been described above.
The present invention is not limited to the above-described embodiment, and all changes in conditions that do not depart from the gist are within the scope of the present invention. For example, in addition to the dehydration using a dehydrator, the neutralization treatment liquid having an increased concentration of the metal hydroxide particles can be conveyed to a flat ground such as a yard and dried in the sun. Further, in addition to the pickling waste liquid, a plating waste liquid can be used, and in this case, the same effect as the pickling waste liquid can be obtained. Also,
As the alkaline liquid, a liquid containing MgO, Mg (OH) 2 or the like can be used.
【００２０】[0020]
【発明の効果】請求項１〜６記載の金属を含む酸性廃液
の処理方法は、金属イオンを含む酸性廃液を連続して容
器内に供給ながら、酸性廃液を中和処理して金属水酸化
物の粒子を析出させ、容器内を攪拌して金属水酸化物に
金属イオンを接触させることにより金属水酸化物を大き
くしてから脱水処理を行うので、金属水酸化物を緻密で
大きい粒子に形成して、脱水の処理効率を高めて金属水
酸化物からなるスラジの水分を低くでき、再利用する際
の処理コストを低減することができる。According to the method for treating an acidic waste liquid containing a metal according to the present invention, the acidic waste liquid is neutralized while continuously supplying the acidic waste liquid containing metal ions into the container. Particles are precipitated, and the inside of the container is agitated and metal hydroxide is brought into contact with metal ions to enlarge the metal hydroxide and then dehydrated, so that the metal hydroxide is formed into dense and large particles. Thus, the processing efficiency of the dehydration can be increased, the water content of the sludge made of metal hydroxide can be reduced, and the processing cost at the time of reuse can be reduced.
【００２１】特に、請求項２記載の金属を含む酸性廃液
の処理方法は、酸性廃液にアルカリ液を添加してｐＨを
４〜１０にするので、金属水酸化物の析出を促進して凝
集剤を節減することができ、処理コストを低減すること
ができる。In particular, in the method for treating an acidic waste liquid containing a metal according to the present invention, an alkaline solution is added to the acidic waste liquid to adjust the pH to 4 to 10. Can be saved, and the processing cost can be reduced.
【００２２】請求項３記載の金属を含む酸性廃液の処理
方法は、酸性廃液の中和処理を行った後に、容器内の水
の一部を分離膜を用いて除去するので、酸性廃液中に含
まれる余剰水を容易に除去することができ、処理装置を
簡素化がすることができる。更に、大きな粒子の金属水
酸化物を形成することができ、より安定して脱水の処理
効率を高めることができる。According to a third aspect of the present invention, the method for treating a metal-containing acidic waste liquid is such that after neutralizing the acidic waste liquid, a part of the water in the container is removed using a separation membrane. The surplus water contained can be easily removed, and the treatment apparatus can be simplified. Furthermore, a metal hydroxide of large particles can be formed, and the processing efficiency of dehydration can be more stably increased.
【００２３】請求項４記載の金属を含む酸性廃液の処理
方法は、分離膜の孔径を１〜１００μｍにしているの
で、分離膜が目詰まりしたり、金属水酸化物が分離膜を
通過するのを抑制して安定して余剰水を除去することが
でき、分離膜の寿命の延長を図ることができる。In the method for treating an acidic waste liquid containing a metal according to the present invention, since the pore size of the separation membrane is 1 to 100 μm, the separation membrane may be clogged or the metal hydroxide may pass through the separation membrane. And it is possible to stably remove excess water and prolong the life of the separation membrane.
【００２４】請求項５記載の金属を含む酸性廃液の処理
方法は、酸性廃液を中和処理して生成した中和処理液の
一部を沈殿槽に供給して余剰水を除去するので、処理装
置をより簡単にでき、しかも、金属水酸化物の粒子を大
きくして脱水効率を安定して向上することができ、再利
用する際の処理コストをより低減することができる。In the method for treating an acidic waste liquid containing a metal according to the present invention, a part of the neutralized treatment liquid produced by neutralizing the acidic waste liquid is supplied to a precipitation tank to remove excess water. The apparatus can be made simpler, the dehydration efficiency can be stably improved by enlarging the metal hydroxide particles, and the processing cost at the time of reuse can be further reduced.
【００２５】請求項６記載の金属を含む酸性廃液の処理
方法は、酸性廃液は、製鉄工場の鋼板の酸洗廃液、ある
いはめっき廃液等の酸性廃液を用いるので、金属水酸化
物を生成し易い廃液の中和処理に適用でき、処理後の排
水の水質が改善され、脱水処理後のスラジの水分を大幅
に低くでき、処理のコストを低減することができる。In the method for treating an acidic waste liquid containing a metal according to claim 6, since the acidic waste liquid is an acidic waste liquid such as a pickling waste liquid of a steel plate in a steel plant or a plating waste liquid, a metal hydroxide is easily formed. It can be applied to the neutralization treatment of the waste liquid, the water quality of the waste water after the treatment is improved, the water content of the sludge after the dehydration treatment can be significantly reduced, and the treatment cost can be reduced.
【図１】本発明の第１の実施の形態に係る金属を含む酸
性廃液の処理方法に適用される廃液処理装置の全体図で
ある。FIG. 1 is an overall view of a waste liquid treatment apparatus applied to a method for treating an acidic waste liquid containing metals according to a first embodiment of the present invention.
【図２】処理経過時間と金属水酸化物濃度の関係を表す
グラフである。FIG. 2 is a graph showing a relationship between a processing elapsed time and a metal hydroxide concentration.
【図３】廃液処理槽の運転日数と金属水酸化物の粒子径
の関係を表すグラフである。FIG. 3 is a graph showing the relationship between the number of operating days of a waste liquid treatment tank and the particle size of metal hydroxide.
【図４】本発明の第２の実施の形態に係る金属を含む酸
性廃液の処理方法に適用される廃液処理装置の全体図で
ある。FIG. 4 is an overall view of a waste liquid treatment apparatus applied to a method for treating an acidic waste liquid containing metals according to a second embodiment of the present invention.
【図５】脱水時間と濾水量の関係を表すグラフである。FIG. 5 is a graph showing a relationship between a dehydration time and a drainage amount.
１０：廃液処理装置、１１：廃液タンク、１２：ポン
プ、１３：廃液処理槽、１４：ポンプ、１５：アルカリ
液タンク、１６：スラリーポンプ、１７：脱水装置、１
８：パイプ、１８ａ：気体供給管、１９：吹き込み孔、
２０：膜モジュール、２１：パイプ、２２：酸性廃液、
２３：スラリー濃度計、２４：中和処理液、２５：ｐＨ
計、３０：廃液処理装置、３１：中和処理槽、３２：仕
切り板、３３：沈殿槽、３４：整流板、３５：排水管、
３６：中和処理液10: Waste liquid treatment device, 11: Waste liquid tank, 12: Pump, 13: Waste liquid treatment tank, 14: Pump, 15: Alkaline liquid tank, 16: Slurry pump, 17: Dehydration device, 1
8: pipe, 18a: gas supply pipe, 19: blow hole,
20: membrane module, 21: pipe, 22: acidic waste liquid,
23: slurry concentration meter, 24: neutralization solution, 25: pH
Total: 30: Waste liquid treatment device, 31: Neutralization treatment tank, 32: Partition plate, 33: Sedimentation tank, 34: Rectifying plate, 35: Drain pipe,
36: Neutralization treatment liquid
フロントページの続き Ｆターム(参考） 4D006 GA02 KA01 KA43 KB13 KC02 KC14 MA22 MB03 MC23 PA02 PB08 PB27 PC22 4D038 AA08 AB65 AB66 AB67 AB79 BA04 BB13 BB17 Continuation of the front page F term (reference) 4D006 GA02 KA01 KA43 KB13 KC02 KC14 MA22 MB03 MC23 PA02 PB08 PB27 PC22 4D038 AA08 AB65 AB66 AB67 AB79 BA04 BB13 BB17
Claims (6)
器内に供給しながら、前記酸性廃液を中和処理して金属
水酸化物の粒子を析出させ、前記容器内を攪拌して該金
属水酸化物に前記金属イオンを接触させることにより前
記金属水酸化物を大きい粒子にしてから脱水処理を行う
ことを特徴とする金属を含む酸性廃液の処理方法。1. While continuously supplying an acidic waste liquid containing metal ions into a container, the acidic waste liquid is neutralized to precipitate metal hydroxide particles, and the inside of the container is stirred by stirring the metal waste. A method for treating an acidic waste liquid containing a metal, wherein the metal hydroxide is brought into contact with a hydroxide to make the metal hydroxide into large particles, and then subjected to a dehydration treatment.
理方法において、前記中和処理は前記酸性廃液にアルカ
リ液を添加してｐＨを４〜１０にすることを特徴とする
金属を含む酸性廃液の処理方法。2. The method for treating an acidic waste liquid containing a metal according to claim 1, wherein the neutralization treatment includes adding an alkaline liquid to the acidic waste liquid to adjust the pH to 4 to 10. How to treat acidic waste liquid.
液の処理方法において、前記酸性廃液の中和処理を行っ
た後に、前記容器内の水の一部を分離膜を用いて除去す
ることを特徴とする金属を含む酸性廃液の処理方法。3. The method for treating an acidic waste liquid containing a metal according to claim 1, wherein a part of the water in the container is removed using a separation membrane after neutralizing the acidic waste liquid. A method for treating an acidic waste liquid containing a metal, comprising:
理方法において、前記分離膜の孔径を１〜１００μｍに
していることを特徴とする金属を含む酸性廃液の処理方
法。4. The method for treating an acidic waste liquid containing a metal according to claim 3, wherein the pore size of the separation membrane is 1 to 100 μm.
液の処理方法において、前記酸性廃液を中和処理して生
成した中和処理液の一部を沈殿槽に供給して余剰水を除
去することを特徴とする金属を含む酸性廃液の処理方
法。5. The method for treating an acidic waste liquid containing a metal according to claim 1 or 2, wherein a part of the neutralized liquid produced by neutralizing the acidic waste liquid is supplied to a sedimentation tank to remove excess water. A method for treating an acidic waste liquid containing a metal, the method comprising removing the metal.
属を含む酸性廃液の処理方法において、前記酸性廃液
は、製鉄工場の鋼板の酸洗廃液あるいはめっき廃液であ
ることを特徴とする金属を含む酸性廃液の処理方法。6. The method for treating an acidic waste liquid containing a metal according to claim 1, wherein the acidic waste liquid is a pickling waste liquid or a plating waste liquid for a steel plate in an iron making plant. A method for treating acidic waste liquid containing a metal.
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|---|---|---|---|
| JP2000346516A JP4482220B2 (en) | 2000-11-14 | 2000-11-14 | Method for treating acidic waste liquid containing metal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000346516A JP4482220B2 (en) | 2000-11-14 | 2000-11-14 | Method for treating acidic waste liquid containing metal |
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| Publication Number | Publication Date |
|---|---|
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| JP4482220B2 JP4482220B2 (en) | 2010-06-16 |
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| JP2000346516A Expired - Lifetime JP4482220B2 (en) | 2000-11-14 | 2000-11-14 | Method for treating acidic waste liquid containing metal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002320979A (en) * | 2001-04-27 | 2002-11-05 | Sharp Corp | Method and system for treating metal-containing drainage |
| JP2004290967A (en) * | 2003-03-11 | 2004-10-21 | Tokuyama Corp | Method for treating waste water |
| JP2006212580A (en) * | 2005-02-04 | 2006-08-17 | Nippon Steel Corp | Method for treating acid waste liquid containing iron and chromium |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104045181B (en) * | 2014-05-08 | 2016-01-20 | 昆明有色冶金设计研究院股份公司 | A kind of dirty acid treatment system and method |
-
2000
- 2000-11-14 JP JP2000346516A patent/JP4482220B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002320979A (en) * | 2001-04-27 | 2002-11-05 | Sharp Corp | Method and system for treating metal-containing drainage |
| US7294268B2 (en) | 2001-04-27 | 2007-11-13 | Sharp Kabushiki Kaisha | Metal containing waste water treatment method and metal containing waste water treatment equipment |
| JP2004290967A (en) * | 2003-03-11 | 2004-10-21 | Tokuyama Corp | Method for treating waste water |
| JP4559755B2 (en) * | 2003-03-11 | 2010-10-13 | 株式会社トクヤマ | Wastewater treatment method |
| JP2006212580A (en) * | 2005-02-04 | 2006-08-17 | Nippon Steel Corp | Method for treating acid waste liquid containing iron and chromium |
| JP4589748B2 (en) * | 2005-02-04 | 2010-12-01 | 新日本製鐵株式会社 | Treatment of acidic waste liquid containing iron and chromium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4482220B2 (en) | 2010-06-16 |
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