WO2010058674A1 - アゾール系銅用防食剤含有水の処理方法 - Google Patents
アゾール系銅用防食剤含有水の処理方法 Download PDFInfo
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- WO2010058674A1 WO2010058674A1 PCT/JP2009/068112 JP2009068112W WO2010058674A1 WO 2010058674 A1 WO2010058674 A1 WO 2010058674A1 JP 2009068112 W JP2009068112 W JP 2009068112W WO 2010058674 A1 WO2010058674 A1 WO 2010058674A1
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- azole
- copper
- water
- anticorrosive
- iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/346—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from semiconductor processing, e.g. waste water from polishing of wafers
Definitions
- the present invention relates to a method for treating water containing an anti-corrosive agent for azole-based copper, and in particular, from effluent containing an anti-corrosive agent for azole-based copper discharged from a chemical mechanical polishing (CMP) step in a semiconductor device manufacturing process.
- CMP chemical mechanical polishing
- the present invention relates to a method for efficiently removing an anticorrosive agent.
- azole copper anticorrosives have an excellent anticorrosive effect, but they are conventionally discharged from these processes because they have a chemically stable structure and are difficult to biodegrade.
- the anti-corrosive agent for azole copper was decomposed by oxidant such as ozone, ultraviolet ray, hydrogen peroxide, etc. with strong oxidizing power or accelerated oxidation method combining them. After that, the treated water is discharged or collected.
- the azole copper anticorrosive is chemically stable, and therefore, it is necessary to add a large amount of oxidative decomposition even if it is an oxidizing agent having strong oxidizing power such as ozone.
- an oxidizing agent having strong oxidizing power such as ozone.
- cost In particular, in recent years, the number of precision polishing processes has increased with higher integration of semiconductor devices, and the amount of polishing wastewater discharged has also increased. It is becoming.
- the pH of the wastewater containing benzotriazole which is a copper anticorrosive, is adjusted to be weakly acidic, this treatment liquid is reacted with an oxidant in an oxidative decomposition tank, and the treatment liquid is further adjusted to a pH of 10 or more in an alkaline adjustment tank.
- Patent Document 1 A method for solid-liquid separation of the produced copper hydroxide has been proposed (Patent Document 1).
- Patent Document 1 A method for solid-liquid separation of the produced copper hydroxide has been proposed (Patent Document 1).
- Patent Document 1 proposes a large amount of an oxidizing agent for the decomposition of a chemically stable azole copper anticorrosive, and particularly when ozone is used as the oxidizing agent, the ozone has a liquid pH.
- the self-decomposition is suppressed under acidic conditions, and the amount of OH radicals having a stronger oxidizing power generated during the ozonolysis process is reduced, thereby reducing the oxidizing power.
- the wastewater from the CMP process also contains abrasive particles (suspended substances) such as colloidal silica used in the CMP process, and prior to the treatment with the oxidizing agent. If the solid-liquid separation process such as agglomeration, precipitation, and filtration is not performed as a pretreatment, the oxidant is wasted in decomposing these suspended substances, thereby reducing the effective utilization efficiency of the oxidant. There is also a problem that the decomposition effect commensurate with the amount of oxidant added is not sufficiently exhibited.
- the present invention solves the above-mentioned conventional problems and provides a method for efficiently removing azole copper anticorrosives in water containing azole copper anticorrosives such as waste water discharged from the CMP process in the semiconductor device manufacturing process.
- the purpose is to do.
- the inventors of the present invention have made ferrous ions efficiently insolubilize the azole-based anticorrosive agent for copper as an iron-azole-based complex for aggregation / solid-liquid separation treatment. I found out that I can.
- suspended solids in the wastewater can be agglomerated during the agglomeration treatment of the insolubilized material, so that ozone is not wasted by injecting ozone into the water after the insolubilized material has been removed.
- Ozone can be effectively used for oxidative decomposition of TOC components including residual azole copper anticorrosives, and TOC components including azole copper anticorrosives are highly decomposed and removed with a small amount of ozone used. The present invention has been completed.
- ferrous ions are added to water containing an azole copper anticorrosive to separate the insoluble iron / azole complex produced. It is characterized by that.
- the remaining TOC component is subjected to ozonolysis.
- the water containing the azole copper anticorrosive is water discharged from the CMP step in the semiconductor device manufacturing process.
- an azole copper anticorrosive agent in water containing an azole copper anticorrosive agent can be effectively insolubilized as an iron-azole complex by ferrous ions, and agglomerated and solid-liquid separated. Moreover, at the time of this agglomeration treatment, the agglomeration treatment can be performed together with suspended substances in the wastewater such as abrasive particles.
- the azole copper anticorrosive agent in the waste water without requiring an expensive oxidizer such as ozone, hydrogen peroxide, and ultraviolet rays, the azole copper anticorrosive agent in the waste water, Furthermore, suspended substances can be treated inexpensively and efficiently.
- the water after removing the insolubilized product produced by the addition of ferrous ions has been removed from not only the azole copper anticorrosive, but also suspended solids.
- the wasteful consumption of ozone can be prevented, and the TOC component containing the azole copper anticorrosive remaining with a small ozone injection amount can be highly decomposed and removed.
- the azole copper anticorrosive-containing water to be treated in the method for treating azole copper anticorrosive containing water of the present invention is not particularly limited, but the present invention is particularly discharged from the CMP process in the semiconductor device manufacturing process. It is effective for the treatment of wastewater containing an azole compound as an anticorrosive for copper.
- the azole compound of the azole copper anticorrosive contained in such azole copper anticorrosive-containing water is a five-membered aromatic compound containing two or more heteroatoms, and at least one of the heteroatoms is a nitrogen atom. It is a compound which is.
- any azole compound that has been conventionally used as an anticorrosive for copper can be applied.
- azole compounds include imidazole, pyrazole, oxazole, isoxazole, thiazole, and isothiazole.
- azoles include, for example, compounds having a condensed ring such as an azole ring and a benzene ring, such as indazole, benzimidazole, benzotriazole, benzothiazole, and alkylbenzotriazole (for example, benzoate) which is a derivative thereof.
- Triazole o-tolyltriazole, m-tolyltriazole, p-tolyltriazole, 5-ethylbenzotriazole, 5-n-propylbenzotriazole, 5-isobutylbenzotriazole, 4-methylbenzotriazole), alkoxybenzotriazole (for example 5 -Methoxybenzotriazole), alkylaminobenzotriazole, alkylaminosulfonylbenzotriazole, mercaptobenzotriazole, hydroxybenzotriazole, Lobenzotriazole (eg 4-nitrobenzotriazole), halobenzotriazole (eg 5-chlorobenzotriazole), hydroxyalkylbenzotriazole, hydrobenzotriazole, aminobenzotriazole, (substituted aminomethyl) -tolyltriazole, carboxybenzotriazole N-alkylbenzotriazole, bisbenzotriazole, naphtho
- 1,2,3-triazole, 1,2,4-triazole, tolyltriazole, benzotriazole and the like are widely used as anticorrosives for copper.
- the azole copper anticorrosive-containing water to be treated in the present invention may contain only one of these azole compounds or two or more thereof.
- these azole copper anticorrosives are contained in an amount of about 5 to 30000 mg / L in the waste water discharged from the CMP process in the semiconductor device manufacturing process.
- ferrous ions are added to azole copper anticorrosive-containing water, and the azole compound, which is an azole copper anticorrosive, is converted into a high molecular weight iron / azole complex according to the following reaction. Insolubilize. Fe 2+ + 1 / 2O 2 +2 (C 2 H 2 N 2 .NH) ⁇ (C 2 H 2 N 2 .N) 2 Fe + 2H 2 O
- ferrous iron-containing flocculant azole copper anticorrosive-containing water
- ferrous sulfate, chloride examples include ferrous salts such as ferrous iron. These may be used alone or in combination of two or more.
- ferrous sulfate is particularly preferable because the oxidation rate of oxygen from air is slow in an acidic sulfuric acid solution.
- the amount of ferrous iron-containing flocculant added is appropriately determined according to the azole copper anticorrosive content of the azole copper anticorrosive containing water to be treated, and usually contains azole copper anticorrosive containing water. It is preferable to add 0.5 to 5.0 times, particularly 0.5 to 3.0 times in molar ratio to the azole copper anticorrosive. If the amount of ferrous iron-containing flocculant added is too small, it will not be possible to obtain a sufficient insolubilizing effect for azole-based copper anticorrosives. It is uneconomical.
- the stirring time is preferably 10 to 30 minutes, more preferably 15 to 20 minutes.
- pH conditions are 4 to 8, particularly 5 to 7 when ferrous ions are added to azole copper anticorrosive-containing water to precipitate an iron-azole complex. If the pH is higher than this range, divalent iron is consumed as iron hydroxide, and part of the iron becomes a monovalent negative ion at a pH lower than this range, so an iron / azole complex This is because inefficiency in generating the.
- FIG. 1 is a systematic diagram which shows embodiment of the processing method of the azole type copper anticorrosive containing water of this invention.
- 1 is a 1st coagulation tank
- 2 is a 2nd coagulation tank
- 3 is a precipitation tank.
- raw water water containing anti-corrosive agent for azole copper
- ferrous iron-containing coagulant and a pH adjuster (acid such as hydrochloric acid or sulfuric acid) are added as necessary.
- the pH is preferably adjusted to 4 to 8, more preferably 5 to 7, and the mixture is preferably stirred for 10 to 30 minutes, more preferably 15 to 20 minutes.
- an iron / azole complex is formed by the reaction of the azole copper anticorrosive in the raw water with ferrous ions.
- the treated water in the first flocculation tank 1 is then introduced into the second flocculation tank 2 and an alkali such as sodium hydroxide, potassium hydroxide, calcium hydroxide or the like is added as a pH adjuster, and the pH is preferably 7 to Adjust to 12 and more preferably 8-11 and stir.
- the residence time in the second aggregating tank 2 is preferably about 5 to 15 minutes, particularly about 5 to 10 minutes.
- the iron / azole complex produced in the first flocculating tank 1 under pH alkaline conditions further aggregates with iron hydroxide flocs to form large flocs.
- suspended substances such as abrasive particles in the raw water are also agglomerated to form a floc.
- the treated water in the second flocculation tank 2 is then solid-liquid separated in the precipitation tank 3, but prior to that, it is preferable to add a polymer flocculant to coarsen the floc.
- the polymer flocculant is added to the pipe from the second flocculation tank 2 to the settling tank 3, but the flocculation tank may be further provided and the polymer flocculant may be added with stirring in the tank. .
- the amount of the polymer flocculant added is not particularly limited, but is usually preferably about 1 to 4 mg / L.
- the water flow LV of the settling tank 3 is preferably 0.5 to 0.8 m / hr, particularly preferably 0.7 to 0.8 m / hr.
- the solid-liquid separation in the precipitation tank 3 removes the azole copper anticorrosive agent insolubilized as an iron / azole complex together with the suspended substances in the raw water, and the concentration of the azole copper anticorrosive agent is reduced. A significantly reduced treated water is obtained.
- This ozonolysis treatment is preferably an ozone-promoted oxidation treatment method.
- ozone-promoted oxidation treatment method For example, (1) Combination of ozone and alkali (2) Combination of ozone and hydrogen peroxide (3) Combination of ozone, hydrogen peroxide and alkali (4 ) It is preferable to use ozone, ultraviolet light and hydrogen peroxide in combination.
- the pH condition is preferably in the range of 8 to 12, particularly 9.5 to 10.5.
- the amount of hydrogen peroxide added is preferably 1 to 1/20 times, particularly 1/3 to 1/7 times the weight of the injected ozone.
- the amount of ozone injected is the amount necessary for decomposing and removing the TOC component.
- the required amount of ozone injected into the TOC concentration of the raw water is agglomeration treatment with ferrous ions prior to ozone decomposition. It is preferable to previously remove the azole copper anticorrosive and the suspended substance in the raw water so that the weight is 6 times or less, particularly 3 times or less.
- treated water having a triazole concentration of 1.5 mg / L or less in terms of TOC with such a small ozone injection amount 100 mg / L or less, for example, 80 to 85 mg / L is obtained by the above-described aggregation treatment with ferrous ions. It is preferable to obtain a solid-liquid separated water of a degree.
- FIG. 2 is a systematic diagram which shows another embodiment of the processing method of the azole type copper anticorrosive containing water of this invention.
- 11 is a coagulation tank
- 12 is a precipitation tank
- 13 is a filtration device
- 14 is an ozone-promoted oxidation reaction tank.
- the treatment conditions in the flocculation tank 11 and the precipitation tank 12 are the same as the treatment conditions in the first flocculation tank 1, the second flocculation tank 2 and the precipitation tank 3 in FIG.
- the solid-liquid separated water in the precipitation tank 13 is further removed from the flocculant and the impurities such as the flocculant and unreacted suspended solids contained in the solid-liquid separated water by the filtration device 13, and then the ozone-promoted oxidation reaction tank. 14.
- the filtration device 13 a general filtration device such as a membrane filtration device or a sand filtration device can be used.
- ozone-promoted oxidation treatment is performed by the above-described methods (1) to (4), and the remaining TOC components such as azole copper anticorrosives are decomposed and removed.
- Example 1 to 5 and Comparative Examples 1 to 13 below were quantified with a TOC meter “5000A” manufactured by Shimadzu Corporation. Further, Example 6 and Comparative Examples 14 to 17 were quantified using a liquid chromatograph system 1100 series manufactured by Hewlett-Packard Company.
- Examples 1 to 5 In the treatment apparatus shown in FIG. 1, treatment was performed using water (pH 6.5) containing 300 mg / L of 1,2,4-triazole as TOC as raw water. In the aggregation treatment, acid (hydrochloric acid) or alkali (sodium hydroxide) was added as a pH adjuster as necessary.
- ferrous sulfate was added to the raw water in the amount shown in Table 1, and the mixture was stirred at 180 rpm for 20 minutes under the pH conditions shown in Table 1.
- Alkali is added to the treated water in the first flocculating tank 1 in the second flocculating tank 2 and stirred at 60 rpm for 60 minutes under the pH conditions shown in Table 1.
- the anionic polymer is added to the treated water in the second flocculating tank 2.
- a flocculant (“PA-331” manufactured by Kurita Kogyo Co., Ltd.) was added at 2.0 mg / L, and solid-liquid separation was performed in the precipitation tank 3.
- the water area of the sedimentation tank 3 was 0.1 m 2 , and the water flow LV was 0.8 m / hr.
- Comparative Examples 1-8 The same as in Examples 1 to 5 except that ferric chloride was used instead of ferrous sulfate, and the addition amount and the pH conditions of the first flocculation tank 1 and the second flocculation tank 2 were changed to the conditions shown in Table 1.
- Table 1 shows the TOC concentration of the treated water obtained.
- Comparative Examples 9-13 Example 1 to 5 except that a sulfuric acid band was used instead of ferrous sulfate, and the addition amount and the pH conditions of the first flocculation tank 1 and the second flocculation tank 2 were changed to the conditions shown in Table 1.
- Table 1 shows the TOC concentration of the treated water obtained after the treatment.
- Example 6 Wastewater containing 180 mg / L of triazole as TOC concentration is used as raw water (360 mg / L as TOC). To this, ferrous sulfate is added at 5000 mg / L (2.4 mol times with respect to triazole) and adjusted to pH 3 with hydrochloric acid. And stirred for 30 minutes. Thereafter, calcium hydroxide was added to adjust the pH to 10, followed by stirring for 20 minutes. Further, 2.0 mg / L of an anionic polymer flocculant (“PA-331” manufactured by Kurita Kogyo Co., Ltd.) was added and 20 After stirring for minutes and aggregating, It filtered with 5 filter paper (made by ADVANTEC). The TOC concentration of the obtained flocculated water was as shown in Table 2.
- PA-331 an anionic polymer flocculant manufactured by Kurita Kogyo Co., Ltd.
- This agglomerated water is placed in a 15 L column (diameter 150 mm, material: transparent vinyl chloride), hydrogen peroxide is added, and the ozone concentration generated by an ozone generator (“GR-RD” manufactured by Sumitomo Precision Instruments) Ozone-promoted oxidative decomposition was performed by blowing 150 g / Nm 3 of ozone gas at a rate of 2 NL / min from the bottom of the column through an air diffuser (Kinoshita ball filter). During this treatment, a 5N aqueous sodium hydroxide solution was injected with a chemical injection pump (“EH-B10VH-100PW1-PH1” manufactured by IWAKI) so that the pH was constant (pH 10).
- GR-RD ozone generator
- the ozone injection amount (g) calculated by the following formula was as shown in Table 1.
- Ozone concentration x flow rate x ozone injection time / 1000 150 g / Nm 3 ⁇ 2 NL / min ⁇ ozone injection time (min) / 1000
- the amount of hydrogen peroxide added was O 3 / H 2 O 2 (weight ratio) of 5.0.
- Example 6 when the raw water was coagulated, polyferric sulfate was used instead of ferrous sulfate, and the treatment was performed in the same manner except that the ozone injection amount was the amount shown in Table 2. It was shown in 1.
- Example 6 the raw water was not subjected to the agglomeration treatment, the raw water was directly subjected to the ozone-promoting oxidation treatment, and the treatment was performed in the same manner except that the ozone injection amount at that time was changed to the amount shown in Table 2. It was shown in 1.
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Abstract
Description
本発明のアゾール系銅用防食剤含有水の処理方法で処理対象とするアゾール系銅用防食剤含有水としては特に制限はないが、本発明は特に、半導体デバイス製造プロセスにおけるCMP工程から排出される銅用防食剤としてのアゾール化合物を含む排水の処理に有効である。
本発明においては、アゾール系銅用防食剤含有水に第一鉄イオンを添加して、アゾール系銅用防食剤であるアゾール化合物を以下のような反応に従って、高分子量の鉄・アゾール系錯体として不溶化する。
Fe2++1/2O2+2(C2H2N2・NH)→(C2H2N2・N)2Fe+2H2O
以下に図面を参照して、第一鉄イオンをアゾール系銅用防食剤含有水に添加する本発明のアゾール系銅用防食剤含有水の処理方法の処理手順を具体的に説明する。
図1において、1は第1凝集槽、2は第2凝集槽、3は沈殿槽である。
本発明においては、上述のようにして、不溶性の鉄・アゾール系錯体を除去して得られた処理水に更にオゾンを注入して、残留するアゾール系銅用防食剤を含むTOC成分を分解除去することにより、より一層アゾール系銅用防食剤を高度に除去することができる。
(1) オゾンとアルカリの併用
(2) オゾンと過酸化水素の併用
(3) オゾンと過酸化水素とアルカリの併用
(4) オゾンと紫外線と過酸化水素の併用
などで行うことが好ましい。
以下に図面を参照して、第一鉄イオンをアゾール系銅用防食剤含有水に添加して処理した後の固液分離水をオゾン酸化する場合の処理手順を具体的に説明する。
図2において、11は凝集槽、12は沈殿槽、13は濾過装置、14はオゾン促進酸化反応槽である。
なお、以下の実施例の1~5と比較例1~13の試料水中のトリアゾール濃度は(株)島津製作所製TOC計「5000A」で定量した。また、実施例6と比較例14~17については、ヒューレット・パッカード社製の液体クロマトグラフシステム1100シリーズで定量した。
図1に示す処理装置で、1,2,4-トリアゾールをTOCとして300mg/L含有する水(pH6.5)を原水として処理を行った。
なお、凝集処理に際しては、必要に応じてpH調整剤として酸(塩酸)又はアルカリ(水酸化ナトリウム)を添加した。
硫酸第一鉄の代りに塩化第二鉄を用い、その添加量と第1凝集槽1及び第2凝集槽2のpH条件を表1に示す条件としたこと以外は実施例1~5と同様にして処理を行い、得られた処理水のTOC濃度を表1に示した。
硫酸第一鉄の代りに硫酸バンドを用い、その添加量と第1凝集槽1及び第2凝集槽2のpH条件を表1に示す条件としたこと以外は実施例1~5と同様にして処理を行い、得られた処理水のTOC濃度を表1に示した。
これに対して、塩化第二鉄や硫酸バンドでは、その添加量を増やしても、トリアゾールを殆ど除去することはできなかった(比較例1~13)。
トリアゾールをTOC濃度として180mg/L含む排水を原水(TOCとして360mg/L)として、これに硫酸第一鉄を5000mg/L(トリアゾールに対して2.4モル倍)添加し、塩酸でpH3に調整して30分間撹拌した。その後、水酸化カルシウムを添加してpH10に調整した後、20分間撹拌し、更にアニオン系高分子凝集剤(栗田工業(株)製「PA-331」)を2.0mg/L添加して20分間撹拌して凝集処理した後、No.5濾紙(ADVANTEC社製)で濾過した。得られた凝集処理水のTOC濃度は表2に示す通りであった。
オゾン濃度×流量×オゾン注入時間/1000
=150g/Nm3×2NL/分×オゾン注入時間(分)/1000
なお、過酸化水素の添加量はO3/H2O2(重量比)で5.0とした。
実施例6において、原水の凝集処理に当たり、硫酸第一鉄の代りにポリ硫酸第二鉄を用い、オゾン注入量を表2に示す量としたこと以外は同様にして処理を行い、結果を表1に示した。
実施例6において、原水の凝集処理を行わず、原水を直接オゾン促進酸化処理を行い、その際のオゾン注入量を表2に示す量としたこと以外は同様にして処理を行い、結果を表1に示した。
なお、本出願は、2008年11月19日付で出願された日本特許出願(特願2008-295757)に基づいており、その全体が引用により援用される。
Claims (10)
- アゾール系銅用防食剤を含有する水に第一鉄イオンを添加して、生成する不溶性の鉄・アゾール系錯体を分離することを特徴とするアゾール系銅用防食剤含有水の処理方法。
- 請求項1において、前記不溶性の鉄・アゾール系錯体を分離した後、残留するTOC成分をオゾン分解することを特徴とするアゾール系銅用防食剤含有水の処理方法。
- 請求項1又は2において、アゾール系銅用防食剤を含有する水が、半導体デバイス製造プロセスにおけるケミカルメカニカルポリッシング工程から排出される水であることを特徴とするアゾール系銅用防食剤含有水の処理方法。
- 請求項1ないし3のいずれか1項において、アゾール系銅用防食剤はアゾール化合物を含んでおり、該アゾール化合物は、イミダゾール、ピラゾール、オキサゾール、イソオキサゾール、チアゾール、イソチアゾール、セレナゾール、1,2,3-トリアゾール、1,2,4-トリアゾール、1,2,5-オキサジアゾール、1,3,4-オキサジアゾール、1,2,3-チアジアゾール、1,2,4-チアジアゾール、1,3,4-チアジアゾール、テトラゾール、1,2,3,4-チアトリアゾール、これらの誘導体、これらのアミン塩、及びこれらの金属塩よりなる群から選ばれた少なくとも1つであることを特徴とするアゾール系銅用防食剤含有水の処理方法。
- 請求項4において、前記アゾール系銅用防食剤含有水は、アゾール化合物を5~30000mg/L含有していることを特徴とするアゾール系銅用防食剤含有水の処理方法。
- 請求項1ないし5のいずれか1項において、硫酸第1鉄及び塩化第1鉄の少なくとも一方よりなる第一鉄塩を添加することにより、アゾール系銅用防食剤含有水に前記第1鉄イオンを添加することを特徴とするアゾール系銅用防食剤含有水の処理方法。
- 請求項6において、第一鉄塩をアゾール系銅用防食剤含有水中のアゾール系銅用防食剤に対してモル比で0.5~5.0倍添加することを特徴とするアゾール系銅用防食剤含有水の処理方法。
- 請求項1ないし7のいずれか1項において、pH4~8のアゾール系銅用防食剤含有水に第一鉄イオンを添加して鉄・アゾール系錯体を析出させることを特徴とするアゾール系銅用防食剤含有水の処理方法。
- 請求項8において、鉄・アゾール系錯体が析出した後、該水のpHを7~12に調整し、鉄・アゾール系錯体と水酸化鉄フロックとを凝集させることを特徴とするアゾール系銅用防食剤含有水の処理方法。
- 請求項9において、その後、該水に高分子凝集剤を添加することを特徴とするアゾール系銅用防食剤含有水の処理方法。
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