JPH0541711B2 - - Google Patents
Info
- Publication number
- JPH0541711B2 JPH0541711B2 JP15494789A JP15494789A JPH0541711B2 JP H0541711 B2 JPH0541711 B2 JP H0541711B2 JP 15494789 A JP15494789 A JP 15494789A JP 15494789 A JP15494789 A JP 15494789A JP H0541711 B2 JPH0541711 B2 JP H0541711B2
- Authority
- JP
- Japan
- Prior art keywords
- rinsing
- equipment
- discoloration
- liquid
- value
- 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
Links
- 239000007788 liquid Substances 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 230000007423 decrease Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- 238000005554 pickling Methods 0.000 claims description 14
- 239000007769 metal material Substances 0.000 claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000012487 rinsing solution Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 description 39
- 239000010959 steel Substances 0.000 description 39
- 238000002845 discoloration Methods 0.000 description 29
- 238000005406 washing Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- 238000011144 upstream manufacturing Methods 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 6
- 229960004887 ferric hydroxide Drugs 0.000 description 6
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 6
- 238000013459 approach Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229960002089 ferrous chloride Drugs 0.000 description 3
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- -1 ferrous metals Chemical class 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 2
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical class [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 208000028659 discharge Diseases 0.000 description 1
- 238000004649 discoloration prevention Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
- C23G3/029—Associated apparatus, e.g. for pretreating or after-treating for removing the pickling fluid from the objects
Landscapes
- 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］
本発明は酸洗処理された金属材料のリンス方法
に関し、特に金属材料を連続的に酸洗しリンス処
理していく際において、ライントラブル等により
金属材料の走行速度が低下したり或は停止した場
合に生ずる金属材料の変色を防止する方法に関す
るものである。尚本発明の対象となる金属材料と
しては、各種合金鋼やAl，Cu等の非鉄金属ある
いはこれらの合金等種々の金属材料が挙げられ、
その形状も帯状、棒状、線状等様々のものがある
が、以下の説明では鋼帯を代表的にとり上げて説
明する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for rinsing pickled metal materials, and in particular, when the metal materials are continuously pickled and rinsed, line troubles etc. The present invention relates to a method for preventing discoloration of a metal material that occurs when the traveling speed of the metal material decreases or stops. The metal materials to which the present invention is applied include various metal materials such as various alloy steels, non-ferrous metals such as Al and Cu, and alloys thereof.
Although there are various shapes such as a band shape, a rod shape, and a line shape, the following description will be made using a steel strip as a representative example.
［従来の技術］
鋼帯の連続生産に当たつては、熱間圧延や冷間
圧延工程あるいは歪取り焼鈍工程等で生成する表
面の酸化スケールを除去して正常化するため、最
終段階で酸洗による脱スケール処理と、酸洗液除
去のためのリンス処理が行なわれる。たとえば第
５図は通常のリンス処理設備を例示するもので、
リンス処理設備３は、酸洗設備２の後方に鋼帯１
の走行方向に沿つて複数の散水リンス部３ａ，３
ｂ，…３ｙ，３ｚを直列に配設してなり、酸洗設
備２から出た鋼帯１は、各散水リンス部３ａ，３
ｂ，…において、各受槽４ａ，４ｂ，…より循環
ポンプＰを経て各散水ノズル５ａ，５ｂ，…から
噴出される洗浄水によつて順次リンス処理された
後、乾燥装置６で乾燥して巻取られる。このリン
ス処理設備３において、洗浄水は最下流側リンス
部３ｚの循環ラインもしくは受槽４ｚへ供給さ
れ、該リンス部３ｚの受槽４ｚからオーバーフロ
ーした洗浄水はその上流側リンス部３ｙの受槽４
ｙへ送られ、これを順次繰り返した後最上流側リ
ンス部３ａの受槽４ａもしくは循環ラインから逐
次抜き出される。この間、鋼帯１表面の酸洗液
（最も多用されているのは塩酸）付着量は、最上
流側リンス部３ａより下流側になるにつれて減少
し、最下流側リンス部３ｚでは実質的に零とな
る。また最上流側リンス部３ａでは多量の酸洗液
が除去されるため、受槽４ａ内の洗浄液PHが最も
低くなり、下流側リンス部になるほど該リンス部
で洗浄除去される酸洗液絶対量が少なくなるた
め、各受槽の洗浄液PHは徐々に中性に近づいてく
る。[Prior art] In the continuous production of steel strips, oxidation is applied at the final stage to remove and normalize the oxidized scale on the surface generated during hot rolling, cold rolling, strain relief annealing, etc. Descaling treatment by washing and rinsing treatment to remove the pickling solution are performed. For example, Figure 5 illustrates a typical rinsing facility.
The rinsing equipment 3 has a steel strip 1 behind the pickling equipment 2.
A plurality of water spray rinse parts 3a, 3 along the running direction of
b,...3y, 3z are arranged in series, and the steel strip 1 coming out of the pickling equipment 2 is connected to each water spray rinsing section 3a, 3z.
b,... are sequentially rinsed with washing water spouted from each water spray nozzle 5a, 5b,... through a circulation pump P from each receiving tank 4a, 4b,..., and then dried in a drying device 6 and rolled. taken. In this rinsing treatment equipment 3, cleaning water is supplied to the circulation line or receiving tank 4z of the most downstream rinsing section 3z, and the washing water overflowing from the receiving tank 4z of the rinsing section 3z is supplied to the receiving tank 4 of the upstream rinsing section 3y.
y, and after repeating this sequentially, they are sequentially extracted from the receiving tank 4a of the most upstream side rinsing section 3a or from the circulation line. During this period, the amount of pickling solution (the most commonly used is hydrochloric acid) attached to the surface of the steel strip 1 decreases as it moves downstream from the most upstream rinse section 3a, and reaches substantially zero at the most downstream rinse section 3z. becomes. In addition, since a large amount of pickling liquid is removed in the most upstream rinsing part 3a, the cleaning liquid PH in the receiving tank 4a becomes the lowest, and the absolute amount of pickling liquid removed in the downstream rinsing part decreases as it approaches the downstream rinsing part. As the amount decreases, the pH of the cleaning solution in each tank gradually approaches neutrality.
［発明が解決しようとする課題］
第５図に示した様なリンス処理設備によるリン
ス効果は、鋼帯１の連続生産ラインが順調に稼動
し鋼帯１が一定の速度で走行している限り何ら問
題を生ずることはない。ところが連続生産ライン
の一部（熱延もしくは冷延工程や焼鈍工程、酸洗
工程等）でトラブルが生じて、リンス処理設備に
おける鋼帯の走行速度が低下したり停止すると、
次の様な問題が生じてくる。[Problems to be Solved by the Invention] The rinsing effect of the rinsing treatment equipment as shown in FIG. No problems will occur. However, if a problem occurs in a part of the continuous production line (hot rolling or cold rolling process, annealing process, pickling process, etc.) and the running speed of the steel strip in the rinsing treatment equipment decreases or stops,
The following problems arise.
即ちリンス処理設備の特に上流側では、前述の
如く酸洗液がまだ完全に除去されておらず、各リ
ンス部で循環供給される洗浄水はかなり強い酸性
を示しているので、この様な酸性水が付着したま
まの状態で鋼帯の走行が停止すると、後述する様
な反応により鋼帯表面が黄色、黒色、赤色等に変
色し品質が著しく損なわれる。 In other words, especially on the upstream side of the rinsing treatment equipment, as mentioned above, the pickling liquid has not yet been completely removed, and the cleaning water that is circulated and supplied to each rinsing section is quite acidic. If the steel strip stops running with water still adhering to it, the surface of the steel strip will change color to yellow, black, red, etc. due to the reaction described below, resulting in a significant loss of quality.
そこでこうした問題を回避するため、鋼帯の走
行速度が低下したり停止したときは、リンス処理
設備全体の受槽に大量の洗浄水を供給して洗浄水
のPHを中性にする手段がとられている。ところが
この手段では、この時点でリンス処理設備から排
出される酸洗排水等の量が急増するため、排出処
理設備にかかる負荷が著しく増大する。従つてリ
ンス処理設備に付設される排水処理設備として
は、こうした不測の事態も考慮したうえで大量の
排液を処理し得る大規模な排水処理設備を設けて
おかねばならず、設備費が高騰する。しかもリン
ス処理設備におけるすべてのリンス部に上記の処
理を施さなければならないので、清浄水の使用量
増大に伴なうコストアツプも軽視できない。 Therefore, in order to avoid such problems, when the running speed of the steel strip decreases or stops, a method is taken to supply a large amount of washing water to the receiving tank of the entire rinsing treatment facility to neutralize the pH of the washing water. ing. However, with this method, the amount of pickling waste water etc. discharged from the rinsing treatment equipment increases rapidly at this point, so the load on the discharge treatment equipment increases significantly. Therefore, the wastewater treatment equipment attached to the rinsing treatment equipment must be large-scale wastewater treatment equipment capable of treating a large amount of wastewater, taking into account such unforeseen circumstances, and equipment costs are rising. do. Moreover, since all the rinsing parts in the rinsing treatment equipment must be subjected to the above-mentioned treatment, the increase in costs due to the increase in the amount of clean water used cannot be ignored.
本発明はこの様な事情に着目してなされたもの
であつて、その目的は、リンス処理設備を通過す
る鋼帯の走行速度が低下し或は停止した場合で
も、前述の様な問題を生ずることなく鋼帯の変色
を確実に防止することのできる方法を提供しよう
とするものである。 The present invention was made with attention to such circumstances, and its purpose is to prevent the above-mentioned problems from occurring even when the running speed of the steel strip passing through the rinsing treatment equipment decreases or stops. The purpose of the present invention is to provide a method that can reliably prevent discoloration of steel strips without causing any damage.
［課題を解決するための手段］
上記課題を解決することのできた本発明に係る
リンス方法の構成は、酸洗後の金属材料を数段階
に分けて形成したリンス設備を順次通過させるこ
とによつてリンスしていくに当たり、上記通過速
度が低下したときには、リンス液のPH値が1.5〜
4.0の範囲内の値を示すリンス設備におけるリン
ス液（洗浄液）に水を補給し、あるいは該リンス
液の温度を低下させ、もしくは該リンス液中の酸
素濃度を低下させるところに要旨を有するもので
ある。[Means for Solving the Problems] The configuration of the rinsing method according to the present invention that can solve the above problems is that the metal material after pickling is sequentially passed through rinsing equipment formed in several stages. When the above-mentioned passing speed decreases during rinsing, the PH value of the rinsing solution should be 1.5 to 1.5.
The gist is to supply water to the rinsing liquid (cleaning liquid) in rinsing equipment that exhibits a value within the range of 4.0, or to lower the temperature of the rinsing liquid, or to reduce the oxygen concentration in the rinsing liquid. be.
［作用及び実施例］
本発明者らはこれまでの経験で、前述の様な不
測の事態が生じたときに見られる変色が、リンス
処理設備内における特定の部位で集中的に発生す
ることを確かめている。またリンス処理設備にお
ける洗浄水のPHは、最上流側リンス部で最も低
く、下流側リンス部になるにつれて中性に近づい
てくることは先に述べた通りである。そこで鋼帯
が変色するか否かは、洗浄水のPHによつて影響を
受けるのではないかと考え、次の方法で洗浄液の
PHと変色の関係を調べた。[Operations and Examples] The present inventors have learned from past experience that the discoloration seen when the above-mentioned unexpected situation occurs occurs concentratedly in a specific part of the rinsing equipment. I'm making sure. Further, as described above, the PH of the washing water in the rinsing treatment equipment is lowest at the most upstream rinsing section, and approaches neutrality as it approaches the downstream rinsing section. Therefore, we thought that whether or not the steel strip would change color would be affected by the pH of the cleaning water, so we used the following method to change the color of the steel strip.
We investigated the relationship between pH and discoloration.
（実験法）
(1) 試験条件
・ リンス液：既設リンス処理設備における最上
流側から４番目のリンス部の循環液を水で希
釈して使用
・ リンス液水質：PH…１〜７、温度…30，50，
70（℃）、流量…10〜33（／分）
・ リンス時間：５〜300（秒）
・ ノズル−鋼板間距離：100〜280（mm）
(2) 試験法
塩酸で脱スケールした鋼板を水洗−温水洗浄−
水洗の後乾燥し冷却したものを供試鋼板とし、こ
れを20g／濃度のFeCl2水溶液に浸漬してから
所定のリンス液でリンス処理を行ない、乾燥後鋼
板表面の変色状態を調べる。(Experimental method) (1) Test conditions ・ Rinse liquid: The circulating liquid from the fourth rinsing section from the most upstream side of the existing rinsing treatment facility was diluted with water and used. ・ Rinse liquid water quality: PH...1 to 7, temperature... 30, 50,
70 (℃), flow rate...10 to 33 (/min) ・ Rinse time: 5 to 300 (seconds) ・ Distance between nozzle and steel plate: 100 to 280 (mm) (2) Test method Rinse the steel plate descaled with hydrochloric acid with water. -Hot water cleaning-
After washing with water, drying and cooling, the test steel plate is immersed in an aqueous FeCl 2 solution with a concentration of 20 g, and then rinsed with a specified rinsing liquid. After drying, the state of discoloration on the surface of the steel plate is examined.
(3) 変色の評価法
上記(2)で得た鋼板の表面の色調をミノルタ社製
の色度計により測定し、３点測定の平均値として
求める。(3) Evaluation method for discoloration The color tone of the surface of the steel plate obtained in (2) above is measured using a Minolta color meter, and the average value of the three measurements is determined.
Ｌ値：白−黒の明度
第１図はリンス液の温度を70℃、リンス時間を
60秒に設定し、リンス液のPHを変えた場合につい
て鋼板の変色状態を調べた結果を示したものであ
る。 L value: white-black brightness Figure 1 shows the temperature of the rinsing liquid at 70℃ and the rinsing time.
This figure shows the results of examining the state of discoloration of the steel plate when the rinsing liquid was set to 60 seconds and the pH of the rinsing liquid was changed.
この図からも明らかである様に、鋼板はリンス
液のPHが1.5〜4.0の範囲で著しく変色し、このPH
域を外れた場合は殆んど変色しない。 As is clear from this figure, the steel plate becomes significantly discolored when the pH of the rinse solution is in the range of 1.5 to 4.0;
When outside the range, there is almost no discoloration.
こうした傾向を示す理由は次の様に考えること
ができる。 The reason for this tendency can be considered as follows.
即ち酸（HCl）洗を受けた鋼板の表面には、下
記の反応により生成した塩化第１鉄が付着してい
るが、
FeO＋2HCl→FeCl2＋H2Ｏ
この塩化第１鉄は、第２図に示す如くリンス処
理工程で水酸化第２鉄に変化する。この水酸化第
１鉄は非常に酸化され易く、リンス液中の酸素に
より酸化されて水酸化第２鉄に変わる。そしてこ
の水酸化第２鉄はPH2.0以上になると溶解度が著
しく低下し、鋼板表面に析出してくるが、これが
脱水されると酸化第２鉄に変化し着色するものと
思われる。 In other words , on the surface of the steel plate that has been washed with acid (HCl), ferrous chloride generated by the following reaction is attached. As shown, it changes to ferric hydroxide during the rinsing process. This ferrous hydroxide is very easily oxidized, and is oxidized by oxygen in the rinsing liquid to turn into ferric hydroxide. The solubility of this ferric hydroxide decreases significantly when the pH exceeds 2.0, and it precipitates on the surface of the steel sheet, but when it is dehydrated, it is thought to change to ferric oxide and become colored.
このとき、リンス液のPHが1.5未満である場合
は、鋼板表面に多量に存在する塩化第１鉄が水酸
化第２鉄に変化したとしても、PHが低いため該水
酸化第２鉄の析出が起こらず、その後の水洗で容
易に除去されるため鋼板の変色は起こりにくい。
一方、リンス液のPHが4.0を超える場合は、塩化
第１鉄の溶解速度が極めて遅く、そのため水酸化
第１鉄の生成、ひいてはその酸化によつて生ずる
水酸化第２鉄の生成が起こらず、その結果酸化第
２鉄も生成しにくくなつて鋼板表面の変色が起こ
らなくなるものと思われる。 At this time, if the PH of the rinse solution is less than 1.5, even if a large amount of ferrous chloride on the surface of the steel sheet changes to ferric hydroxide, the ferric hydroxide will precipitate because the PH is low. This prevents discoloration of the steel plate because it is easily removed by subsequent washing with water.
On the other hand, if the pH of the rinsing solution exceeds 4.0, the dissolution rate of ferrous chloride is extremely slow, and therefore the formation of ferrous hydroxide and, by extension, the formation of ferric hydroxide caused by its oxidation do not occur. As a result, it is thought that ferric oxide is also less likely to be produced and discoloration of the steel plate surface does not occur.
即ち鋼板の変色を防止するには、第２図に示し
たFeCl2→Fe（OH）2→Fe（OH）3→Fe2O3の反応を
いずれかの段階で阻止して酸化第２鉄が生成しな
い様な条件を与えてやればよく、リンス液のPHを
1.5〜4.0の範囲外にコントロールするとその条件
が与えられ、鋼板の変色が防止されるものと思わ
れる。 In other words, in order to prevent discoloration of the steel plate, the reaction of FeCl 2 →Fe(OH) 2 →Fe(OH) 3 →Fe 2 O 3 shown in Fig. 2 must be inhibited at some stage to produce ferric oxide. All you need to do is to provide conditions that will prevent the formation of
It is thought that if the value is controlled outside the range of 1.5 to 4.0, that condition will be provided and discoloration of the steel plate will be prevented.
また上記の変色反応の速度は温度およびリンス
処理系の酸素濃度によつても変わつてくる。たと
えば第３図は、リンス液の温度を変えた場合のリ
ンス時間（スプレー時間）と変色状態の関係を示
したグラフである。但し使用したリンス液として
は下記の通りである。 The rate of the above-mentioned discoloration reaction also varies depending on the temperature and oxygen concentration of the rinsing system. For example, FIG. 3 is a graph showing the relationship between rinsing time (spray time) and discoloration state when the temperature of the rinsing liquid is changed. However, the rinsing liquid used was as follows.
（リンス液）
PH：2.5
比重：0.994g／ml
HCl濃度：0.2g／以下
FeCl2濃度：0.19g／
Cl濃度：204mg／
第３図からも明らかである様に、リンス液PHが
変色を最も起こし易い2.5であつても、リンス液
の温度を十分に下げてやれば鋼板の変色は起こり
難くなり、リンス液を冷却することが変色防止の
有効な手段となる。(Rinse solution) PH: 2.5 Specific gravity: 0.994g/ml HCl concentration: 0.2g/or less FeCl 2 concentration: 0.19g/ Cl concentration: 204mg/ As is clear from Figure 3, the rinsing solution PH is the most effective against discoloration. Even if it is 2.5, which is easy to cause, if the temperature of the rinsing liquid is lowered sufficiently, discoloration of the steel plate will be less likely to occur, and cooling the rinsing liquid is an effective means of preventing discoloration.
また第４図は、リンス液のPHを2.5、温度を70
度、流量を33／min、リンス時間を30秒または
60秒に設定し、リンス液中の酸素濃度を変えた場
合の変色状態を調べた結果を示したものである。 Figure 4 also shows that the pH of the rinse liquid is 2.5 and the temperature is 70.
rate, flow rate 33/min, rinse time 30 seconds or
The results show the results of examining the state of discoloration when the rinse time was set to 60 seconds and the oxygen concentration in the rinse solution was varied.
この図からも明らかである様に、リンス液PHが
最も変色を起こし易い2.5であり且つ比較的高温
条件にある場合でも、リンス液中の酸素濃度を十
分に下げてやれば前述の酸化反応が進行しにくく
なり、鋼板の変色は抑えられる。 As is clear from this figure, even if the rinsing liquid pH is 2.5, which is the most likely to cause discoloration, and the condition is relatively high, the aforementioned oxidation reaction can be prevented if the oxygen concentration in the rinsing liquid is sufficiently lowered. Progression becomes more difficult and discoloration of the steel plate is suppressed.
本発明はこうした実験事実を基にしてなされた
ものであつて、その具体的構成は、リンス処理設
備における鋼帯の通過速度が低下しあるいは停止
したときは、リンス液のPH値が1.5〜4.0の範囲内
の値を示すリンス部（即ち変色する可能性のある
部分）だけに注目し、当該リンス部だけに水を補
給してリンス液のPHを4.0より高い値にするか、
あるいは該リンス液を冷却し、もしくは該リンス
液の酸素濃度を低下させることとし、変色の恐れ
のない他のリンス部については定常状態のリンス
条件をそのまま維持するものである。 The present invention was made based on these experimental facts, and its specific configuration is that when the passing speed of the steel strip in the rinsing treatment equipment decreases or stops, the PH value of the rinsing liquid is 1.5 to 4.0. Focus only on the rinsing area that shows a value within the range (i.e., the area where there is a possibility of discoloration) and replenish water only to that rinsing area to raise the PH of the rinsing solution to a value higher than 4.0, or
Alternatively, the rinsing liquid is cooled or the oxygen concentration of the rinsing liquid is lowered, and the steady-state rinsing conditions are maintained as they are for other rinsing parts where there is no risk of discoloration.
その結果、リンス処理設備全体のリンス液に水
を供給して変色を防止する従来法に比べると、本
発明は該設備の極く一部だけに前述の処理を施す
ものであるからリンス処理設備全体としての給水
量は著しく抑えられ、排水処理設備を極端に大規
模化しておく必要もなくなる。尚リンス処理設備
においてリンス液のPH値が1.5〜4.0の範囲になる
位置は、該リンス処理設備のリンス能力や鋼帯の
走行速度により変わつてくるので、本発明を実施
するに当たつては定常稼動時における各リンス部
のリンス液PHを予め測定しておき、そのPHが1.5
〜4.0の範囲となるリンス部を確認しておいて、
鋼帯の走行速度が低下したり停止したときは当該
リンス部だけに前述の変色防止処理を施せばよ
い。尚当該リンス部の酸素濃度を下げる手段とし
ては、たとえば当該リンス部の槽内に窒素ガス等
をバブリングして溶存酸素を放出させる方法等を
採用すればよい。また本発明を実施するに当たつ
ては前記３つの手段のうち１つを採用するだけで
目的を達成することができるが、これらの手段を
２つ以上組合わせ、たとえば該当するリンス部に
冷水を供給してPHを高めつつ冷却する方法等を採
用すれば、変色を一層確実に阻止することができ
るので好ましい。 As a result, compared to the conventional method of supplying water to the rinsing solution of the entire rinsing equipment to prevent discoloration, the present invention applies the above-mentioned treatment to only a small part of the equipment, so the rinsing equipment The overall amount of water supplied will be significantly reduced, and there will be no need for extremely large-scale wastewater treatment equipment. The position in the rinsing equipment where the PH value of the rinsing liquid is in the range of 1.5 to 4.0 varies depending on the rinsing capacity of the rinsing equipment and the running speed of the steel strip. Measure the rinsing liquid PH of each rinsing part in advance during steady operation, and check that the PH is 1.5.
Check the rinse part that is in the range of ~4.0,
When the running speed of the steel strip decreases or stops, the above-mentioned discoloration prevention treatment may be applied only to the rinse portion. As a means for lowering the oxygen concentration in the rinsing section, for example, a method of bubbling nitrogen gas or the like into the tank of the rinsing section to release dissolved oxygen may be adopted. Furthermore, in carrying out the present invention, the object can be achieved by employing only one of the three means described above, but it is possible to combine two or more of these means, for example, by adding cold water to the relevant rinsing section. It is preferable to adopt a method of cooling while increasing the PH by supplying water, since discoloration can be more reliably prevented.
［発明の効果］
本発明は以上の様に構成されており、リンス処
理設備内における鋼帯の走行速度が低下し或は停
止したときは、該リンス処理設備におけるリンス
液PHが1.5〜4.0の範囲の値を示すリンス部のみに
前記した所定の処理を施すだけで鋼帯の変色を確
実に阻止することができ、リンス排液処理設備を
小型化し得ると共に洗浄水の使用量も低減するこ
とができ、またリンス処理設備の極く一部に所定
の処理を施すだけであるから工程管理も容易であ
るなど、実用に即した多大な利益を享受すること
ができる。また本願発明は鋼帯の連続リンス処理
に限らず、酸洗された様々の金属帯や板材、線
材、管材、棒材のリンス処理にも幅広く活用する
ことができる。[Effects of the Invention] The present invention is configured as described above, and when the running speed of the steel strip in the rinsing equipment decreases or stops, the pH of the rinsing liquid in the rinsing equipment is 1.5 to 4.0. Discoloration of the steel strip can be reliably prevented by simply applying the above-mentioned predetermined treatment to only the rinsing part showing the value within the range, and the rinsing liquid treatment equipment can be downsized and the amount of washing water used can be reduced. In addition, since only a small portion of the rinsing equipment is subjected to the predetermined treatment, process control is easy, and many practical benefits can be enjoyed. Furthermore, the present invention is not limited to the continuous rinsing treatment of steel strips, but can be widely used in rinsing treatment of various pickled metal strips, plate materials, wire rods, pipe materials, and bar materials.
第１図はリンス液のPHと鋼板の変色度の関係を
示すグラフ、第２図は鋼板の変色原因を示す化学
変化の説明図、第３図はリンス所要時間と変色度
の関係を示すグラフ、第４図はリンス液中の酸素
濃度と変色度の関係を示すグラフ、第５図はリン
ス処理設備を示す概略図である。
１……鋼帯、２……酸洗設備、３……リンス処
理設備、３ａ，３ｂ，…３ｙ，３ｚ……リンス
部、４ａ，４ｂ，…４ｙ，４ｚ……受槽、Ｐ……
循環ポンプ、５ａ，５ｂ，…５ｙ，５ｚ……噴射
ノズル、６……乾燥設備。
Figure 1 is a graph showing the relationship between the PH of the rinsing liquid and the degree of discoloration of the steel plate, Figure 2 is an explanatory diagram of chemical changes that show the causes of discoloration of the steel plate, and Figure 3 is a graph showing the relationship between the required time for rinsing and the degree of discoloration. , FIG. 4 is a graph showing the relationship between the oxygen concentration in the rinsing liquid and the degree of discoloration, and FIG. 5 is a schematic diagram showing the rinsing treatment equipment. 1... Steel strip, 2... Pickling equipment, 3... Rinse treatment equipment, 3a, 3b,... 3y, 3z... Rinse section, 4a, 4b,... 4y, 4z... Receiving tank, P...
Circulation pump, 5a, 5b,...5y, 5z...Injection nozzle, 6...Drying equipment.
Claims (1)
リンス設備を順次通過させることによつてリンス
していくに当たり、上記通過速度が低下したとき
には、リンス液のPH値が1.5〜4.0の範囲内の値を
示すリンス設備におけるリンス液に水を補給する
ことを特徴とする金属材料のリンス方法。 ２ 酸洗後の金属材料を数段階に分けて形成した
リンス設備を順次通過させることによつてリンス
していくに当たり、上記通過速度が低下したとき
には、リンス液のPH値が1.5〜4.0の範囲内の値を
示すリンス設備におけるリンス液の温度を低下さ
せることを特徴とする金属材料のリンス方法。 ３ 酸洗後の金属材料を数段階に分けて形成した
リンス設備を順次通過させることによつてリンス
していくに当たり、上記通過速度が低下したとき
には、リンス液のPH値が1.5〜4.0の範囲内の値を
示すリンス設備におけるリンス液中の酸素濃度を
低下させることを特徴とする金属材料のリンス方
法。[Claims] 1. When rinsing a metal material after pickling by sequentially passing it through rinsing equipment formed in several stages, when the passing speed decreases, the PH value of the rinsing solution decreases. A method for rinsing metal materials, characterized in that water is supplied to a rinsing liquid in rinsing equipment in which the value of is within the range of 1.5 to 4.0. 2. When rinsing the metal material after pickling by sequentially passing it through a rinsing equipment formed in several stages, when the above-mentioned passing speed decreases, the PH value of the rinsing liquid is in the range of 1.5 to 4.0. A method for rinsing metal materials characterized by lowering the temperature of a rinsing liquid in rinsing equipment that exhibits a value within . 3. When rinsing the metal material after pickling by sequentially passing it through a rinsing equipment formed in several stages, when the above-mentioned passing speed decreases, the PH value of the rinsing liquid is in the range of 1.5 to 4.0. A method for rinsing metal materials characterized by reducing the oxygen concentration in a rinsing liquid in rinsing equipment that exhibits a value within .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15494789A JPH0320485A (en) | 1989-06-16 | 1989-06-16 | Method for rinsing metallic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15494789A JPH0320485A (en) | 1989-06-16 | 1989-06-16 | Method for rinsing metallic material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0320485A JPH0320485A (en) | 1991-01-29 |
| JPH0541711B2 true JPH0541711B2 (en) | 1993-06-24 |
Family
ID=15595399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15494789A Granted JPH0320485A (en) | 1989-06-16 | 1989-06-16 | Method for rinsing metallic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0320485A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2705365B2 (en) * | 1991-05-22 | 1998-01-28 | 住友金属工業株式会社 | Method and apparatus for preventing discoloration in continuous pickling line |
| JP2788689B2 (en) * | 1992-04-20 | 1998-08-20 | 日鉱金属株式会社 | Surface treatment method for copper and copper alloy |
| FR2697032B1 (en) * | 1992-10-19 | 1995-01-06 | Lorraine Laminage | Pickling process for steel materials. |
| BR112019013445A2 (en) | 2017-03-24 | 2019-12-31 | Nippon Steel Corp | steel sheet fabrication method |
| JP7380615B2 (en) * | 2021-03-02 | 2023-11-15 | Ｊｆｅスチール株式会社 | Steel strip manufacturing method and manufacturing equipment |
-
1989
- 1989-06-16 JP JP15494789A patent/JPH0320485A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0320485A (en) | 1991-01-29 |
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