JP2898286B2 - Stainless steel pickling equipment - Google Patents
Stainless steel pickling equipmentInfo
- Publication number
- JP2898286B2 JP2898286B2 JP63059336A JP5933688A JP2898286B2 JP 2898286 B2 JP2898286 B2 JP 2898286B2 JP 63059336 A JP63059336 A JP 63059336A JP 5933688 A JP5933688 A JP 5933688A JP 2898286 B2 JP2898286 B2 JP 2898286B2
- Authority
- JP
- Japan
- Prior art keywords
- concentration
- acid
- pickling
- predetermined
- acid solution
- 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 - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はステンレス鋼の酸洗処理装置に関し、更に詳
しくは、酸洗処理の過程で酸洗槽内の酸液が当初設定し
た所定濃度に自動的に維持・管理されているので、ステ
ンレス鋼の酸洗槽への投入チャンスは規制されず、その
ため酸洗処理ラインの全体的な処理能力を高めることが
できる酸洗処理装置に関する。Description: TECHNICAL FIELD The present invention relates to an apparatus for pickling stainless steel, and more particularly, to an acid solution in a pickling tank having a predetermined concentration in an acid pickling tank during the pickling process. Since it is automatically maintained and managed, the chance of putting stainless steel into the pickling tank is not restricted, and therefore the present invention relates to a pickling apparatus capable of increasing the overall processing capacity of the pickling line.
（従来の技術） ステンレス鋼材の製造過程では、その表面に鋼種に応
じたスケールが発生する。そしてこのスケールは、例え
ばフッ硝酸のような所定の酸を含む酸液を用いて酸洗処
理され、除去される。(Prior Art) In the process of manufacturing a stainless steel material, a scale corresponding to the type of steel is generated on the surface thereof. Then, the scale is pickled with an acid solution containing a predetermined acid such as hydrofluoric nitric acid, and is removed.
酸洗処理のラインには、複数基の酸洗槽が配列されて
いる。酸洗槽には上記した酸液が収容され、ここに脱ス
ケールすべき鋼材が投入されて処理される。この場合、
処理する鋼種に応じて酸液の濃度は規定される。それ
は、鋼種によって脱スケールの難易度が異なり、一般に
脱スケールしにくい鋼種ほど高濃度の酸液で処理するこ
とが必要であるからである。そのため、脱スケールの難
易度に応じて酸液は所定濃度に建浴されるのである。A plurality of pickling tanks are arranged in the pickling line. The above-mentioned acid solution is stored in the pickling tank, and a steel material to be descaled is put into the pickling tank and processed. in this case,
The concentration of the acid solution is determined according to the type of steel to be treated. This is because the degree of difficulty of descaling differs depending on the type of steel, and generally, the more difficult the type of descaling, the more it is necessary to treat with a high-concentration acid solution. For this reason, the acid solution is bathed at a predetermined concentration according to the difficulty of descaling.
また、この処理過程では、脱スケールの累積処理量が
増加するにつれて、その処理に用いた酸液の酸濃度は低
下する。そして、ある処理量に到った時点では、そのと
きの酸液はその鋼材に対する脱スケール能、すなわち酸
洗力を喪失する。そのような状態に到った酸液は、新鮮
な酸液を追加して当初の酸濃度にまで建浴し、再び前記
鋼材の脱スケールに使用するか、または酸濃度が低下し
ている状態のままで、脱スケールし易い他の鋼材すなわ
ちより低濃度の酸液で脱スケールできる他の鋼材を処理
するために継続して使用される。In this process, as the cumulative amount of descaling increases, the acid concentration of the acid solution used in the process decreases. Then, when a certain amount of treatment is reached, the acid solution at that time loses the descaling ability for the steel material, that is, the pickling power. The acid solution that has reached such a state is constructed by adding a fresh acid solution and bathing up to the initial acid concentration, and is used again for descaling the steel material, or the acid concentration is reduced. As it is, it is continuously used to treat other steel materials that are easy to descaling, that is, other steel materials that can be descaled with a lower concentration of acid solution.
このラインには、脱スケール性の異なる各種の鋼材が
連続的に送り込まれてくる。したがって、このラインを
運転するに当っては、使用する酸液の酸洗力の弱化とい
う問題と関連させながら、脱スケールしにくい鋼材から
順次選択しつつ酸液に投入することになる。Various steel materials having different descaling properties are continuously fed into this line. Therefore, in operating this line, it is necessary to successively select steel materials that are difficult to descaling and to feed into the acid solution in connection with the problem of weakening the pickling power of the acid solution used.
このため、ラインには通常２系列の酸洗槽が配置され
ている。それは、一方の系列を用いて脱スケール性の難
易に応じて鋼材の酸洗処理を順次進める過程で、他方の
系列の酸液を所定の酸濃度にまで建浴し、前記した一方
の系列の酸液の酸洗力が喪失した時点で酸洗処理をこち
らの系列で行なうように切換え、あわせて前記した一方
の建浴を進めるためである。すなわち、酸洗処理のライ
ンを効率的に運転するためである。For this reason, two lines of pickling tanks are usually arranged in the line. That is, in the process of sequentially proceeding the pickling treatment of steel according to the difficulty of descaling using one of the series, the acid solution of the other series is built up to a predetermined acid concentration, and This is because, when the pickling power of the acid solution is lost, the pickling process is switched to be performed in this series, and the one of the building baths is advanced. That is, it is for efficiently operating the pickling treatment line.
（発明が解決しようとする課題） 従来の酸洗処理ラインの場合、上記したように、脱ス
ケール処理過程で使用する酸液の酸濃度が低下する。そ
して一般に酸液は低濃度になるまで使用に供される。そ
のために、処理酸液中には処理中の鋼材から各種金属が
溶出し、その金属イオン濃度が増加して処理酸液の酸洗
力は弱化する。その酸洗力が最も脱スケールし易い鋼種
に対しても効力を有さなくなった時点で、新たな酸液を
追加して処理酸液を再生することが行なわれるが、一般
にこのような処理によっては酸濃度の調節は困難であ
る。(Problems to be Solved by the Invention) In the case of a conventional pickling treatment line, as described above, the acid concentration of the acid solution used in the descaling process decreases. Generally, the acid solution is used until its concentration becomes low. For this reason, various metals are eluted from the steel material being processed into the treated acid solution, the metal ion concentration increases, and the pickling power of the treated acid solution is weakened. When the pickling power has no effect on the steel type that is most likely to be descaled, a new acid solution is added to regenerate the treated acid solution. It is difficult to adjust the acid concentration.
鋼材の脱スケールにとっては、その鋼材に適した酸濃
度がある。しかし上記ラインにおいては、酸洗槽内酸液
の酸濃度は経時的に変化しており、また、送り込まれて
くる鋼材の脱スケール性は多用であり、また処理すべき
量も多様であるため、鋼材の投入チャンスは規制を受け
る。このようなことから、現実のラインにおいては上記
した適正な酸濃度の条件に基づいた酸洗は事実上無理で
ある。そのため、過剰酸洗または再酸洗を要する酸洗不
足が発生し易い。For descaling of steel, there is an acid concentration suitable for the steel. However, in the above-mentioned line, the acid concentration of the acid solution in the pickling tank changes with time, and the descaling property of the steel material to be sent is heavy, and the amount to be treated is also various. In addition, the introduction chance of steel products is regulated. For this reason, in an actual line, pickling based on the above-described condition of an appropriate acid concentration is practically impossible. Therefore, insufficient pickling that requires excessive pickling or re-pickling is likely to occur.
更に、同一の酸洗槽内で同一の酸液を長時間に亘って
使用すると槽底には多量のスラッジが短期間で堆積す
る。そのため、定期的にかつ短い間隔でラインの運行を
停止してスラッジ除去掃除をすることが必要になる。Further, when the same acid solution is used for a long time in the same pickling tank, a large amount of sludge is deposited on the tank bottom in a short period of time. For this reason, it is necessary to stop the operation of the line regularly and at short intervals to perform sludge removal cleaning.
本発明は上記したような問題を解決し、鋼材の投入チ
ャンスの規制を受けることがなく高効率で酸洗処理ライ
ンを運行することが可能である新規なステンレス鋼の酸
洗処理装置の提供を目的とする。The present invention solves the above-described problems, and provides a novel stainless steel pickling apparatus capable of operating a pickling line with high efficiency without being restricted by the chance of introducing steel materials. Aim.
（課題を解決するための手段） 上記目的を達成するために、本発明のステンレス鋼の
酸洗処理装置は、その構成が、複数段階の所定濃度に設
定された所定酸の溶液がそれぞれに収容され、そこでは
ステンレス鋼が酸洗処理される複数基の酸洗槽、濃度の
最も低い酸洗槽を除く酸洗槽に少なくとも配設され、酸
洗槽の処理酸液を濾過する濾過器と該濾過器で濾過され
た処理酸液から前記所定酸を回収する回収部とを有し、
回収した該所定酸液を前記酸洗槽に還流する酸回収装
置、各酸洗槽の処理酸液中の所定酸の濃度を常時自動分
析して濃度信号を発信する自動分析装置、および、前記
自動分析装置からの濃度信号が入力され、該濃度信号が
示す前記処理酸液中の濃度と予め設定された前記所定濃
度とを比較演算し、前記処理酸液中の所定酸の濃度が前
記所定濃度より低い場合は、所定酸供給装置に作動信号
を発信し、前記所定酸供給装置から所定酸を前記酸洗槽
に供給せしめ、前記酸洗槽の所定酸の濃度を前記所定濃
度に管理するコンピュータ装置とを具備し、ステンレス
鋼をその鋼種に応じて前記複数基の酸洗槽の一つ以上を
選択してこれら酸洗槽に投入して酸洗処理することを特
徴とする。(Means for Solving the Problems) In order to achieve the above object, a pickling treatment apparatus for stainless steel of the present invention has a configuration in which a solution of a predetermined acid set to a predetermined concentration in a plurality of stages is accommodated in each. There, a plurality of pickling tanks in which stainless steel is pickled, and at least a pickling tank except the pickling tank having the lowest concentration, and a filter for filtering the treated acid solution in the pickling tank. A recovery unit for recovering the predetermined acid from the treated acid solution filtered by the filter,
An acid recovery device that refluxes the collected predetermined acid solution to the pickling tank, an automatic analyzer that constantly automatically analyzes the concentration of the predetermined acid in the processing acid solution in each pickling tank and transmits a concentration signal, and A concentration signal from the automatic analyzer is input, and the concentration in the processing acid solution indicated by the concentration signal is compared with the predetermined concentration, and the concentration of the predetermined acid in the processing acid solution is determined by the predetermined concentration. When the concentration is lower than the concentration, an operation signal is transmitted to the predetermined acid supply device, the predetermined acid is supplied from the predetermined acid supply device to the pickling tank, and the concentration of the predetermined acid in the pickling tank is controlled to the predetermined concentration. A computer device is provided, wherein one or more of the plurality of pickling tanks are selected according to the type of the steel, and the pickling tanks are charged into the pickling tanks to perform pickling.
本発明装置においては、まず、酸洗槽が複数基配置さ
れている。各酸洗槽には所定の酸液が収容されるが、そ
れぞれの酸液の酸濃度は異なっており、各槽に要求され
る所定濃度になっている。通常、高濃度、中濃度、低濃
度の３段階であってよい。この場合、各酸液は、後述す
る手段により、それぞれに要求される所定濃度に常時管
理され、維持されている。すなわち、本発明装置におい
て、ライン運行時には各酸洗槽内の酸液の酸濃度が一定
値になっているのである。In the apparatus of the present invention, first, a plurality of pickling tanks are arranged. A predetermined acid solution is stored in each pickling tank, and the acid concentration of each acid solution is different, and the acid concentration is a predetermined concentration required for each tank. Usually, there may be three levels of high density, medium density and low density. In this case, each acid solution is constantly controlled and maintained at a predetermined concentration required for each by the means described later. That is, in the apparatus of the present invention, the acid concentration of the acid solution in each pickling tank has a constant value during line operation.
この酸洗槽には酸液の回収装置が配設される。この酸
回収装置は、鋼材を酸洗しつつある酸洗槽内の処理酸液
を処理し、その中に含まれているスラッジ等を濾取する
と同時に、使用している所定酸を回収し、この回収酸を
所定濃度に復元して再び酸洗槽に還流する。このような
酸回収は例えば所定酸がフッ硝酸であった場合、常用さ
れている拡散透析法、溶媒抽出法、電気透析法などによ
って容易に行なうことができる。なお、この酸回収装置
は、前記した各酸洗槽のうち、低濃度酸液を収容する槽
には必ずしも配設する必要はない。An acid solution recovery device is provided in this pickling tank. This acid recovery apparatus treats a treatment acid solution in a pickling tank while pickling steel materials, and at the same time, collects a predetermined acid used by filtering sludge and the like contained therein, The recovered acid is restored to a predetermined concentration and refluxed to the pickling tank again. For example, when the predetermined acid is hydrofluoric-nitric acid, such acid recovery can be easily performed by a commonly used diffusion dialysis method, solvent extraction method, electrodialysis method, or the like. The acid recovery device does not necessarily need to be provided in a tank containing a low-concentration acid solution among the above-mentioned pickling tanks.
つぎに、本発明装置には自動分析装置が配設され、酸
洗槽内の処理酸液中の所定酸の酸濃度の経時的な濃度変
化が自動的に分析される。自動分析装置としては格別限
定されるものではなく、所定酸を自動分析できるもので
あれば何であってもよく、例えば特願昭60−141974号、
特開昭62−2144号公報で開示されているものをあげるこ
とができる。分析の結果は、所定酸の濃度信号として後
述するコンピュータ装置に発信される。Next, an automatic analyzer is provided in the apparatus of the present invention, and a time-dependent change in the acid concentration of a predetermined acid in the processing acid solution in the pickling tank is automatically analyzed. The automatic analyzer is not particularly limited and may be any as long as it can automatically analyze a predetermined acid. For example, Japanese Patent Application No. 60-141974,
JP-A-62-2144 can be mentioned. The result of the analysis is transmitted to a computer device described later as a concentration signal of the predetermined acid.
なお、この場合の自動分析の対象は、所定酸の外に、
処理過程で溶出し処理酸液中に含まれている鉄成分の濃
度であってもよい。それは、酸液がフッ硝酸であると
き、処理酸液中の鉄イオン濃度は脱スケール時間に影響
を与えるからである。In this case, the target of the automatic analysis is, in addition to the predetermined acid,
It may be the concentration of the iron component eluted in the treatment process and contained in the treated acid solution. This is because, when the acid solution is hydrofluoric-nitric acid, the iron ion concentration in the treated acid solution affects the descaling time.
本発明者らは、HF:1.3N（2.6％）、HNO3:2.3N（14.5
％）のフッ硝酸にFe（NO3）3を溶解して、濃度（g/l）
が０、10、20、30、40の酸液を調製し、液量400ml、液
温50℃の条件下で、ここに、直径7mm長さ100mmで溶体化
処理を施した後のSUS304の線材、直径8mm長さ100mmで焼
鈍処理を施した後のSUS430の線材を投入し、脱スケール
状態を観察したところ、第２図、第３図に示すような結
果を得た。すなわち、いずれの鋼種の場合も、鉄イオン
濃度が10〜20g/lの場合に脱スケールに要した時間
（分）は短くなる。また、SUS430の場合は、鉄イオン濃
度が30g/lより高くなると表面に縞模様が発生して変色
してくる。このようなことから、酸液がフッ硝酸の場合
は、酸洗処理の過程でその処理酸液の鉄イオン濃度を10
〜20g/lの範囲内に調節することが必要になる。The present inventors have, HF: 1.3N (2.6%) , HNO 3: 2.3N (14.5
%) By dissolving Fe (NO 3 ) 3 in hydrofluoric nitric acid and concentration (g / l)
Prepare a solution of acid of 0, 10, 20, 30, and 40, under the condition of 400 ml of liquid volume and 50 ° C of liquid temperature, here, wire rod of SUS304 after solution treatment with 7 mm diameter and 100 mm length A SUS430 wire rod having a diameter of 8 mm and a length of 100 mm, which had been subjected to an annealing treatment, was charged, and the descaled state was observed. The results shown in FIGS. 2 and 3 were obtained. That is, in any of the steel types, when the iron ion concentration is 10 to 20 g / l, the time (minute) required for descaling becomes short. In the case of SUS430, when the iron ion concentration is higher than 30 g / l, a stripe pattern is generated on the surface and the color changes. For this reason, when the acid solution is hydrofluoric-nitric acid, the iron ion concentration of the treated acid solution is reduced to 10 during the pickling process.
It will need to be adjusted to within the range of ~ 20 g / l.
この自動分析装置から発信された処理酸液の濃度信号
は次のコンピュータ装置に入力される。このコンピュー
タには、各酸洗槽の酸液の所定濃度が基準値として記憶
されており、コンピュータ装置はこれと入力された前記
濃度信号とを比較する。The concentration signal of the processing acid solution transmitted from the automatic analyzer is input to the next computer device. The computer stores a predetermined concentration of the acid solution in each pickling tank as a reference value, and the computer compares the concentration with the input concentration signal.
そして、濃度信号が基準の所定濃度よりも低くなって
いる場合、その濃度差を解消することを目的としてコン
ピュータは，所定酸を貯蔵しそれを各酸洗槽に供給する
装置に作動信号を発信する。その結果、この所定酸供給
装置からは新鮮で酸濃度一定の所定酸が酸洗槽に供給さ
れて、そこの酸濃度を基準の所定濃度にまで高める。こ
のとき、供給される所定酸の量は、コンピュータからの
作動信号によって規定される。When the concentration signal is lower than the reference concentration, the computer sends an operation signal to a device that stores the prescribed acid and supplies it to each pickling tank in order to eliminate the difference in concentration. I do. As a result, fresh acid having a constant acid concentration is supplied to the pickling tank from the acid supply device, and the acid concentration there is increased to a predetermined reference concentration. At this time, the amount of the supplied predetermined acid is determined by an operation signal from a computer.
（作用） 本発明の装置においては、各酸洗槽の酸濃度は多段階
に区分されており、しかも鋼材の処理過程においても酸
回収装置の作用により回収、再生され、また自動分析装
置の作用により常時酸濃度が自動分析され、その結果は
コンピュータで演算されて酸供給がなされる。そのた
め、各酸洗槽の酸液は、常時所定濃度に維持され、かつ
新鮮な状態にある。それゆえ、ラインの運行において
は、鋼材の投入チャンスに対する規制は解除される。ま
た、短期間でのスラッジの堆積も解消される。(Action) In the apparatus of the present invention, the acid concentration in each pickling tank is divided into multiple stages, and the acid is recovered and regenerated by the action of the acid recovery apparatus even in the process of treating steel, and the action of the automatic analyzer is also performed. , The acid concentration is always automatically analyzed, and the result is calculated by a computer to supply the acid. Therefore, the acid solution in each pickling tank is always maintained at a predetermined concentration and is in a fresh state. Therefore, in the operation of the line, the regulation on the input chance of the steel material is released. In addition, sludge accumulation in a short period is eliminated.
さらに、本発明の装置においては、複数段階の所定濃
度に維持された複数の酸洗槽が設けられているから、例
えば高濃度の酸洗槽に所定時間投入した後、中濃度ある
いは低濃度の酸洗槽にさらに所定時間投入し、あるいは
中濃度の酸洗槽に所定時間投入した後、低濃度の酸洗槽
にさらに所定時間投入するといった処理を行う方が適正
な脱スケールを行うことができる鋼種に対して、所定濃
度に維持管理されている各酸洗槽に順次投入していくこ
とによって、迅速かつ適正な酸洗処理が行われる。Furthermore, in the apparatus of the present invention, since a plurality of pickling tanks maintained at a predetermined concentration in a plurality of stages are provided, for example, after being charged into a high-concentration pickling tank for a predetermined time, the medium concentration or the low concentration It is better to put in the pickling tank for a certain period of time, or to put it in a medium-concentration pickling tank for a certain period of time, and then to put it in a low-concentration pickling tank for a predetermined period of time. By successively charging the steel type to each pickling tank maintained at a predetermined concentration, quick and appropriate pickling treatment is performed.
（発明の実施例） 以下に、本発明装置の実施例を添付図面に基づいて詳
細に説明する。第１図は、酸液としてフッ硝酸を用いた
場合の本発明装置のラインの概略図である。図におい
て、実線の経路は酸液の流路を表し、破線経路は電気指
令信号の伝達経路を表す。(Embodiment of the Invention) Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic view of a line of the apparatus of the present invention when hydrofluoric / nitric acid is used as an acid solution. In the figure, a solid line path indicates an acid solution flow path, and a broken line path indicates an electric command signal transmission path.
このラインの場合、酸洗槽は５基から構成されてい
る。すなわち、高濃度フッ硝酸Ａの槽1a、1b、中濃度フ
ッ硝酸Ｂの槽2a、2b、そして低濃度フッ硝酸Ｃの槽３で
ある。槽1aと1b、槽2aと2bとの間は、それぞれポンプ4
a、4bを介して液循環できるようになっている。したが
って、槽1aと1b内のフッ硝酸の濃度、また槽2aと2b内の
フッ硝酸の濃度は各槽間で同濃度になっており、しかも
酸洗処理に必要な所定濃度に設定されている。In the case of this line, the pickling tank is composed of five units. That is, tanks 1a and 1b for high-concentration hydrofluoric nitric acid A, tanks 2a and 2b for medium-concentration hydrofluoric nitric acid B, and a tank 3 for low-concentration hydrofluoric nitric acid C. Pumps 4 are provided between tanks 1a and 1b and tanks 2a and 2b, respectively.
The liquid can be circulated through a and 4b. Therefore, the concentration of hydrofluoric-nitric acid in the tanks 1a and 1b and the concentration of hydrofluoric-nitric acid in the tanks 2a and 2b are the same between the respective tanks, and are set to a predetermined concentration required for the pickling treatment. .
槽1b（したがって槽1a）、槽2b（したがって槽2a）に
は、それぞれ、酸回収装置５、５′が配設されている。
酸回収装置５、５′は、槽1b、2bからポンプ5a、５′ａ
によってフッ硝酸Ａ、Ｂをとり出し、濾過器5b、５′ｂ
でスラッジを除去したのち、その濾液を回収部5c、５′
ｃ、に送流し、ここに水を流入してフッ硝酸として再生
したのち、これを弁13、13′は開、弁14、14′は閉にし
た状態で流路P11→P12、Ｐ′11→Ｐ′12、を経由せしめ
て再び槽1b、2bに還流する。The tanks 1b (therefore, the tank 1a) and the tank 2b (therefore, the tank 2a) are provided with acid recovery devices 5, 5 ', respectively.
The acid recovery devices 5, 5 'are provided with pumps 5a, 5'a from the tanks 1b, 2b.
Fluoric nitric acid A and B are taken out by a filter 5b, 5'b
After removing the sludge with, the filtrate is collected in the collecting sections 5c and 5 '.
c, sent to sink, after reproduced as hydrofluoric nitric acid flows into the water here, which valve 13, 13 'opens, the valve 14, 14' flow path P 11 → P 12 while the closed, P ′ 11 → P ′ 12 , and is returned to the tanks 1b and 2b again.
各槽のフッ硝酸の濃度はそれぞれ流路P1、Ｐ′1、
P2、Ｐ′2、P3を経由して自動分析装置で分析され、そ
の濃度信号S1はコンピュータ装置７に入力される。The concentration of hydrofluoric nitric acid in each tank is determined by the flow paths P 1 , P ' 1 ,
The signal is analyzed by the automatic analyzer via P 2 , P ′ 2 , and P 3 , and the concentration signal S 1 is input to the computer 7.
コンピュータ装置７は、自らが記憶する各槽1a、1b、
2a、2b、３内のフッ硝酸の所定濃度と、上記濃度信号S1
とを比較演算する。The computer device 7 stores each of the tanks 1a, 1b,
The predetermined concentration of hydrofluoric nitric acid in 2a, 2b, 3 and the concentration signal S 1
Is compared with.
例えば、フッ硝酸Ａの濃度が所定濃度よりも低くなっ
ている場合、コンピュータ装置７は、フッ硝酸供給装置
に作動信号S2を発信して該装置を作動せしめる。すなわ
ち、フッ酸タンク８、硝酸タンク８′のそれぞれの弁8
a、８′ａを開弁して各タンクから所定量のフッ酸、硝
酸を調製タンク９に送液し、ポンプ10、弁11、ポンプ4a
をそれぞれ作動せしめタンク９の調製フッ硝酸を流路P4
から槽1aに注入し、かつ槽1bとの間で液循環せしめる。For example, when the concentration of hydrofluoric nitric acid A is lower than a predetermined concentration, a computer device 7, allowed to actuate the device by transmitting an operation signal S 2 in a hydrofluoric nitric acid supply device. That is, the respective valves 8 of the hydrofluoric acid tank 8 and the nitric acid tank 8 '
a, 8'a are opened and a predetermined amount of hydrofluoric acid and nitric acid are sent from each tank to the preparation tank 9, and pump 10, valve 11, pump 4a
The flow path P 4 Preparation hydrofluoric nitric acid respectively actuated allowed tank 9
From the tank 1a, and circulates the liquid between the tank 1b.
フッ硝酸Ｂに対しては、同様にして調整した新たなフ
ッ硝酸を弁12を作動して流路P5から槽2aに注入し、かつ
槽2bとの間で液循環せしめればよい。また、低濃度のフ
ッ硝酸Ｃに対しても、前記と同様に，タンク９で調整さ
れたフッ硝酸を流路P6から槽３に送入すればよい。For hydrofluoric nitric B, and new hydrofluoric nitric acid was prepared in the same manner by operating the valve 12 is injected from the flow path P 5 to the vessel 2a, and it Seshimere liquid circulates between the tank 2b. Moreover, even for low concentrations of hydrofluoric nitric acid C, similar to the above, it may be fed hydrofluoric nitric acid which has been adjusted in the tank 9 from the flow passage P 6 to the vessel 3.
なお、弁13、13′、弁14、14′の作動をコンピュータ
装置７の機能に組み込むことにより、フッ硝酸Ａ、Ｂの
酸回収動作の自動化ができる。このとき、弁13、13′は
開、弁14、14′は閉になる。また、弁13、13′を閉にし
弁14、14′を開にすれば、高濃度のフッ硝酸をそれより
も低濃度の酸洗槽に送入することもできる。By incorporating the operations of the valves 13 and 13 'and the valves 14 and 14' into the functions of the computer device 7, the acid recovery operation of the hydrofluoric nitric acids A and B can be automated. At this time, the valves 13, 13 'are opened and the valves 14, 14' are closed. If the valves 13 and 13 'are closed and the valves 14 and 14' are opened, high-concentration hydrofluoric-nitric acid can be fed into a lower-concentration pickling tank.
また、酸回収装置５、５′からの脱酸液や槽３からの
フッ硝酸は流路P7を経由して脱酸液利用槽15に貯蔵さ
れ、鋼材の脱スケールに利用することができる。Moreover, hydrofluoric nitric from deoxidizing solution or bath 3 from acid recovery unit 5,5 'is stored in a deoxidizing solution utilizing tank 15 and then through the passageway P 7, can be used for descaling steel .
（発明の効果） 以上の説明で明らかなように、本発明のステンレス鋼
の酸洗処理装置は、酸洗処理の過程で各酸洗槽内の酸液
の酸濃度は一定値に維持されている。それゆえ、鋼種は
いつの時点でも酸洗槽に投入することができ、投入チャ
ンスの規制は解除される。そして、特に、濃度の異なる
酸洗槽にそれぞれ所定時間つづ投入し処理した方が脱ス
ケールを良好に行うことができる鋼種に対しても、本酸
洗処理装置は迅速に対応することができる。また、常時
酸液の回収、再生が行なわれるため、酸洗槽の槽底への
スラッジ堆積速度は遅くなる。そのため定期的に槽底ス
ラッジの除去掃除を行なう期間は長くなり、ラインの停
止間隔は短くなる。(Effect of the Invention) As is clear from the above description, the pickling apparatus for stainless steel of the present invention maintains the acid concentration of the acid solution in each pickling tank at a constant value during the pickling process. I have. Therefore, the steel type can be put into the pickling tank at any time, and the regulation of the feeding chance is released. In particular, the present pickling apparatus can quickly cope with a steel type in which descaling can be performed more favorably by charging the pickling tanks having different concentrations for a predetermined period of time. Further, since the acid solution is constantly collected and regenerated, the sludge deposition rate on the bottom of the pickling tank is reduced. Therefore, the period for periodically removing and cleaning the tank bottom sludge becomes longer, and the interval of stopping the line becomes shorter.
このように本発明の装置は、酸洗処理ラインの運行効
率を著しく高め、しかも、過剰酸洗または酸洗不足の状
態をも解消することができてその工業的価値は大であ
る。As described above, the apparatus according to the present invention can significantly increase the operating efficiency of the pickling treatment line, and can also eliminate excessive pickling or insufficient pickling, and is of great industrial value.
第１図は酸液がフッ硝酸である場合の本発明装置のライ
ンの概略図、第２図、第３図はいずれもフッ硝酸中の鉄
イオン濃度が脱スケール時間に与える影響を示す関係図
である。 1a,1b,2a,2b,3…酸洗槽、A,B,C…フッ硝酸、4a,4b,5a,
5′a,10…ポンプ、5,5′…酸回収装置、5b,5′ｂ…濾過
器、5c,5′ｃ…回収部、６…自動分析装置、７…コンピ
ュータ装置、８…フッ酸タンク、８′…硝酸タンク、９
…液調整タンク、8a,8′a,11,12,13,13′,14,14′…
弁、15…脱酸液利用槽、P11，P12,P′11,P′12，P4，
P5，P6，P7…流路、S1…濃度信号、S2…作動信号。FIG. 1 is a schematic diagram of a line of the apparatus of the present invention when the acid solution is hydrofluoric-nitric acid, and FIGS. 2 and 3 are relational diagrams showing the effect of the iron ion concentration in hydrofluoric-nitric acid on the descaling time. It is. 1a, 1b, 2a, 2b, 3 ... pickling tank, A, B, C: hydrofluoric acid, 4a, 4b, 5a,
5'a, 10 pump, 5,5 'acid recovery unit, 5b, 5'b filter, 5c, 5'c recovery unit, 6 automatic analyzer, 7 computer unit, 8 hydrofluoric acid Tank, 8 '... nitric acid tank, 9
… Liquid adjustment tanks, 8a, 8'a, 11, 12, 13, 13 ', 14, 14'…
Valve, 15 ... deacidification solution available tank, P 11, P 12, P '11, P' 12, P 4,
P 5, P 6, P 7 ... passage, S 1 ... density signal, S 2 ... actuation signal.
フロントページの続き (56)参考文献 特開 昭62−37385（ＪＰ，Ａ) 特開 昭59−200773（ＪＰ，Ａ) 特開 昭60−141881（ＪＰ，Ａ) 特開 昭57−101675（ＪＰ，Ａ) 特開 昭48−22384（ＪＰ，Ａ) 特開 昭48−22385（ＪＰ，Ａ) 実開 昭61−9114（ＪＰ，Ｕ) 特公 昭60−35995（ＪＰ，Ｂ２) 特公 昭58−25751（ＪＰ，Ｂ２) 特公 昭55−36073（ＪＰ，Ｂ２)Continuation of the front page (56) References JP-A-62-37385 (JP, A) JP-A-59-200773 (JP, A) JP-A-60-141811 (JP, A) JP-A-57-101675 (JP) JP-A-48-22384 (JP, A) JP-A-48-22385 (JP, A) JP-A-61-9114 (JP, U) JP-B-60-35995 (JP, B2) JP-B Sho-A 58-25751 (JP, B2) JP-B 55-36073 (JP, B2)
Claims (1)
溶液がそれぞれに収容され、そこではステンレス鋼が酸
洗処理される複数基の酸洗槽と、 濃度の最も低い酸洗槽を除く酸洗槽に少なくとも配設さ
れ、酸洗槽の処理酸液を濾過する濾過器と該濾過器で濾
過された処理酸液から前記所定酸を回収する回収部とを
有し、回収した該所定酸液を前記酸洗槽に還流する酸回
収装置と、 各酸洗槽の処理酸液中の所定酸の濃度を常時自動分析し
て濃度信号を発信する自動分析装置と、 前記自動分析装置からの濃度信号が入力され、該濃度信
号が示す前記処理酸液中の濃度と予め設定された前記所
定濃度とを比較演算し、前記処理酸液中の所定酸の濃度
が前記所定濃度より低い場合は、所定酸供給装置に作動
信号を発信し、前記所定酸供給装置から所定酸を前記酸
洗槽に供給せしめ、前記酸洗槽の所定酸の濃度を前記所
定濃度に管理するコンピュータ装置とを具備し、 ステンレス鋼をその鋼種に応じて前記複数基の酸洗槽の
一つ以上を選択してこれら酸洗槽に投入して酸洗処理す
ることを特徴とするステンレス鋼の酸洗処理装置。1. A solution of a predetermined acid having a predetermined concentration in a plurality of stages is accommodated therein, and a plurality of pickling tanks in which stainless steel is pickled and a pickling tank having the lowest concentration. A filter for filtering the treated acid solution in the pickling tank, and a collecting unit for collecting the predetermined acid from the treated acid solution filtered by the filter. An acid recovery device that refluxes a predetermined acid solution to the pickling tank, an automatic analyzer that constantly automatically analyzes the concentration of the predetermined acid in the processing acid solution in each pickling tank and transmits a concentration signal, and the automatic analyzer. The concentration signal from the processing acid solution is input, and the concentration in the processing acid solution indicated by the concentration signal is compared with the predetermined concentration, and the concentration of the predetermined acid in the processing acid solution is lower than the predetermined concentration. In this case, an operation signal is transmitted to the predetermined acid supply device, and the predetermined acid supply device A computer device for supplying acid to the pickling tank, and controlling the concentration of the predetermined acid in the pickling tank to the predetermined concentration, wherein one of the plurality of pickling tanks is formed of stainless steel according to the type of steel. A pickling treatment apparatus for stainless steel, wherein at least one of them is put into these pickling tanks and pickled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63059336A JP2898286B2 (en) | 1988-03-15 | 1988-03-15 | Stainless steel pickling equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63059336A JP2898286B2 (en) | 1988-03-15 | 1988-03-15 | Stainless steel pickling equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01234582A JPH01234582A (en) | 1989-09-19 |
| JP2898286B2 true JP2898286B2 (en) | 1999-05-31 |
Family
ID=13110377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63059336A Expired - Lifetime JP2898286B2 (en) | 1988-03-15 | 1988-03-15 | Stainless steel pickling equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2898286B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT404030B (en) * | 1995-02-15 | 1998-07-27 | Andritz Patentverwaltung | METHOD OF STAINLESSING STEEL MATERIALS, ESPECIALLY STAINLESS STEEL |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5536073A (en) * | 1978-09-07 | 1980-03-13 | Toyo Seikan Kaisha Ltd | Metallic lid fitting device |
| JPS6035995A (en) * | 1983-08-08 | 1985-02-23 | Secoh Giken Inc | Moving device of load |
| JPS6052737A (en) * | 1983-09-01 | 1985-03-26 | Kawasaki Steel Corp | Pickling liquid sampling device for measurement of acid concentration |
| JPS60141881A (en) * | 1983-12-29 | 1985-07-26 | Kawasaki Steel Corp | Method for controlling concentration of pickling solution |
| JPS619114U (en) * | 1984-06-22 | 1986-01-20 | 川崎製鉄株式会社 | Metal strip cleaning equipment |
-
1988
- 1988-03-15 JP JP63059336A patent/JP2898286B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01234582A (en) | 1989-09-19 |
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