KR20010064358A - A method for controlling inhibitor concentration by free concentration of hydrochloric acid in pickling tank - Google Patents
A method for controlling inhibitor concentration by free concentration of hydrochloric acid in pickling tank Download PDFInfo
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- KR20010064358A KR20010064358A KR1019990064535A KR19990064535A KR20010064358A KR 20010064358 A KR20010064358 A KR 20010064358A KR 1019990064535 A KR1019990064535 A KR 1019990064535A KR 19990064535 A KR19990064535 A KR 19990064535A KR 20010064358 A KR20010064358 A KR 20010064358A
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- 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
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
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- 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
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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- 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
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- 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
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/36—Regeneration of waste pickling liquors
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- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
본 발명은 제철소내 열연강판 표면에 존재하는 산화철을 제거하는 산세설비에 있어서 발생하고 있는 과산세 및 미산세라는 품질 결함을 제거하기 위해 단순히 염산의 총투입량에 대해서가 아니라 산화철과 반응할 수 있는 자유산 농도와 인히비터 농도 간의 비율을 일정하게 제어하는 산세설비내의 염산 자유산 농도에 따른 인히비터 농도 제어방법에 관한 것이다.The present invention is not only about the total dose of hydrochloric acid, but also free to react with iron oxide in order to remove the quality defects such as peracid and micro pickling generated in a pickling facility for removing iron oxide present on the surface of a hot rolled steel sheet in a steel mill. The present invention relates to an inhibitor concentration control method according to hydrochloric acid free acid concentration in a pickling plant which controls a ratio between an acid concentration and an inhibitor concentration.
냉연공정에서는 열간압연된 강판 표면에 생성된 산화철을 제거하기 위하여 산세설비로 산세처리하고 있는 바 도 1은 광양 4냉연공장의 산세설비를 간단히 도식화하여 나타낸 것으로, 다른 냉연공장에서의 산세설비와 다소간의 차이는 있지만 유사하다고 볼 수 있다.In the cold rolling process, the pickling treatment is performed with pickling equipment to remove iron oxides formed on the hot rolled steel sheet. FIG. 1 shows a schematic drawing of the pickling equipment of Gwangyang Cold Rolling Mill. Although there is a difference, it can be regarded as similar.
도 1에 나타낸 바와 같이 산세설비는 열연강판인 소재강판(27)이 1,2,3번 산세탱크(17), (18),(19)를 지나가는 동안 산세탱크 내부의 염산과 반응하여 강판 표면의 산화철이 제거되도록 설계되어 있다. 산세탱크(17),(18),(19) 각각의 하부에는 1,2,3번 염산순환탱크(13),(14),(15)가 있어서 1,2,3번 산세탱크(17),(18),(19)쪽으로 염산공급펌프(22),(23),(24)를 통해 염산을 공급하고, 반대로 1,2,3번 산세탱크(17), (18),(19)에서 산화철을 제거하고 배출되는 염산을 받아들여서 염산을 지속적으로 순환시키게 되어 있다.As shown in FIG. 1, the pickling equipment reacts with hydrochloric acid in the pickling tank while the raw material steel sheet 27, which is a hot rolled steel sheet, passes through the pickling tanks 17, 18, and 19. Iron oxide is designed to be removed. The pickling tanks 17, 18, and 19 each have 1,2,3 hydrochloric acid circulation tanks 13, 14, and 15, so that the pickling tanks 17, 18 are Hydrochloric acid is supplied through hydrochloric acid feed pumps (22), (23) and (24) to (18) and (19), and the pickling tanks (17), (18) and (19) are reversed. Iron oxide is removed from the reactor and the hydrochloric acid released is taken in to continuously circulate the hydrochloric acid.
염산(신산:New Acid)은 산회수 설비(11)로부터 신산 저장탱크(12)로 지속적으로 공급되며, 염산은 다시 1,2,3번 염산순환탱크(13),(14),(15)로 공급될 수 있도록 시스템이 구성되어 있다.Hydrochloric acid (New Acid) is continuously supplied from the acid recovery plant (11) to the acid storage tank (12), and hydrochloric acid is again converted into hydrochloric acid circulation tanks (13), (14) and (15). The system is configured to be supplied with
그러나 일반적으로 염산은 3번 염산순환탱크(15)로만 공급된다. 3번 염산순환탱크 (15) 내의 염산은 산화철을 제거하는데 사용되며, 매시간당 일정량은 캐스케이드 펌프(20)를 통해 2번 염산순환탱크(14)로 이동한다. 2번 염산순환탱크(14)에서도 마찬가지로 일정량의 염산이 캐스케이드 펌프(21)를 통해 1번 염산순환태크 (13)로 이동하여 사용되며, 더이상 사용할 수 없는 폐산(Waste Acid)이 되어 폐산 저장탱크(16)에 저장되게 되며, 이 폐산은 다시 산회수 설비(11)로 되돌아가서 재활용된다.In general, however, hydrochloric acid is only supplied to the hydrochloric acid circulation tank 15 three times. Hydrochloric acid in the third hydrochloric acid circulation tank 15 is used to remove iron oxide, and a certain amount per hour is transferred to the second hydrochloric acid circulation tank 14 through the cascade pump 20. Similarly in the second hydrochloric acid circulation tank 14, a certain amount of hydrochloric acid is used to move to the first hydrochloric acid circulation tag 13 through the cascade pump 21 to be used as waste acid (Waste Acid) which can no longer be used. 16), and this waste acid is recycled back to the acid recovery facility (11).
그리고 인히비터는 인히비터 저장탱크(25)에 저장되어 있으며, 인히비터 공급펌프(26)를 통해 3번 염산순환탱크(15)로만 지속적으로 공급된다.In addition, the inhibitor is stored in the inhibitor storage tank 25 and is continuously supplied only to the hydrochloric acid circulation tank 15 through the inhibitor supply pump 26.
도 2는 종래의 염산과 인히비터 공급제어를 나타낸 순서도로서, 먼저 라인 PLC(30)에서 설정된 강판의 속도(V)를 평균한 속도(VA)와 SCC(32)로부터 제공되는강판폭(B)정보 그리고 DDC CRT(34)에서 운전자에 의해 설정된 파라미터(K1,X.)를 연산하여 예상 염산 공급량 Q1을 구한다. K1은 산화철 보정계수, X는 폐산농도 설정값,는 수정 정수로서 통계적인 데이터로 구하는 값들이다. 그리고 1번 염산순환탱크(13) 내에 존재하는 염산량을 고려한 인자(Factor)인 Y를 Q1과 곱한 값이 최종 염산공급량 Q가 되며, 염산유량 조절계(36), 조절밸브(37), 유량계(38)의 제어를 통해 3번 염산순환탱크(15)로 염산을 공급한다.FIG. 2 is a flow chart showing conventional hydrochloric acid and inhibitor supply control. First, the speed V A obtained by averaging the speed V of the steel sheet set in the line PLC 30 and the steel sheet width B provided from the SCC 32. Information and parameters set by the driver in the DDC CRT 34 (K 1 , X. ) To obtain the expected hydrochloric acid supply Q 1 . K 1 is iron oxide correction factor, X is waste acid concentration set value, Are modified integers and are values obtained from statistical data. Then, a value obtained by multiplying the factor Y considering the amount of hydrochloric acid present in the first hydrochloric acid circulation tank 13 by Q 1 becomes the final hydrochloric acid supply amount Q. Hydrochloric acid is supplied to the third hydrochloric acid circulation tank 15 through the control of (38).
한편 인히비터 공급량 F는 최종 염산공급량 Q에 비례상수 f를 곱한 값이며, 인히비터 유량조절계(40), 조절밸브(41), 유량계(42)의 제어에 의해 3번 염산순환탱크(15)로 인히비터를 공급한다.On the other hand, the inhibitor supply amount F is a value obtained by multiplying the final hydrochloric acid supply amount Q by the proportional constant f, and the third hydrochloric acid circulation tank 15 is controlled by the inhibitor flow regulator 40, the control valve 41, and the flow meter 42. Supply the inhibitor.
상기한 종래의 염산과 인히비터 공급제어 방법, 즉 공급되는 염산량 Q에 비례하여 인히비터량 F를 공급하게 될 경우, 총염산농도와 인히비터의 비율은 일정하게 유지되지만, 실제로 산화철을 제거할 수 있는 자유산 농도와 인히비터의 비율은 심한 편차를 보이게 되는 바 이는 도 3에 나타낸 염산/인히비터 농도 추이곡선을 보면 알 수 있다.In the conventional hydrochloric acid and inhibitor supply control method, that is, when the inhibitor amount F is supplied in proportion to the amount of hydrochloric acid Q supplied, the total hydrochloric acid concentration and the ratio of the inhibitor remain constant, but the iron oxide can be removed. The ratio of free acid concentration to inhibitor may show a severe deviation, which can be seen from the hydrochloric acid / inhibitor concentration curve shown in FIG. 3.
도 3에 나타낸 염산/인히비터 농도 추이곡선은 총염산농도(50), 자유산농도 (51), 인히비터 농도(52),(53)에 대하여 1999년 9월 일별 실적을 그래프화한 것으로서, 총염산농도(50), 자유산농도(51), 총염산 대비 인히비터농도(52)는 실측값이며, 자유산 대비 인히비터농도(53)는 본 발명에 채용시 투입량을 계산한 값이다.The hydrochloric acid / inhibitor concentration curve shown in FIG. 3 is a graph of the September 1999 daily results for total hydrochloric acid concentration (50), free acid concentration (51), inhibitor concentration (52), and (53). The total hydrochloric acid concentration 50, the free acid concentration 51, the inhibitor concentration 52 relative to the total hydrochloric acid is an actual value, and the inhibitor concentration 53 relative to the free acid is a value calculated when the dose is employed in the present invention.
일반적으로 시간당 유사한 량의 염산을 공급하고 배출하기 때문에 총염산농도(50)는 일정 수준을 유지하는 것을 알 수 있다. 그러나 자유산농도(51)는 심한 편차를 보이고 있는 바 이는 강판의 폭, 두께, 재질, 온도에 따라 산화철의 량이 많은 차이를 나타내기 때문이라고 추정된다.In general, the total hydrochloric acid concentration (50) can be seen to maintain a constant level because it supplies and discharges a similar amount of hydrochloric acid per hour. However, the free acid concentration 51 shows a severe deviation because it is estimated that the amount of iron oxide varies greatly depending on the width, thickness, material, and temperature of the steel sheet.
즉, 산화철이 많은 경우는 총염산농도(50) 중에서 산화철과 반응완료한 염산이 많기 때문에 자유산농도(51)가 감소하게 되며, 반대로 산화철이 작은 경우는 자유산농도(51)가 증가하게 되는 것이다.That is, in the case of a large amount of iron oxide, the free acid concentration 51 decreases because of the large amount of hydrochloric acid reacted with iron oxide in the total hydrochloric acid concentration 50, and on the contrary, when the iron oxide is small, the free acid concentration 51 increases. will be.
그런데 종래의 산세설비에서는 총염산농도(50)와 비례하여 인히비터가 공급되기 때문에 총염산대비 인히비터농도(52)는 거의 일정한 수준을 보이고 있다. 즉, 자유산농도(51)와는 상관없이 인히비터가 공급되기 때문에 자유산농도 대비 인히비터(53)가 적게 공급되는 경우는 자유산의 부식작용이 활발하여 강판 소지철의 직접적인 부식인 과산세가 발생하게 되며, 반대로 자유산농도 대비 인히비터(53)가 많은 경우는 산화철의 제거가 미흡한 상태인 미산세가 발생하게 되며, 이러한 결함은 강판의 품질에 치명적인 것으로 종래의 인히비터농도 제어방법으로는 해결이 곤란한 실정이다.By the way, since the inhibitor is supplied in proportion to the total hydrochloric acid concentration (50) in the conventional pickling equipment, the inhibitor concentration (52) compared to the total hydrochloric acid is showing a substantially constant level. That is, since the inhibitor is supplied irrespective of the free acid concentration 51, when the inhibitor 53 is supplied less than the free acid concentration, the corrosion of the free acid is active. On the contrary, when the inhibitor 53 is larger than the free acid concentration, microacid is generated due to insufficient removal of iron oxide. Such defects are fatal to the quality of the steel sheet and are solved by the conventional inhibitor concentration control method. This is a difficult situation.
본 발명은 상기한 실정을 감안하여 종래 염산과 인히비터 공급제어 방법이 갖는 문제점들을 해결하고자 발명한 것으로서, 인히비터 공급량을 총염산농도에 비례하여 공급하지 않고 온라인(On-Line)으로 구한 자유산농도에 비례하여 인히비터를 공급하여 미산세 및 과산세를 줄이는 산세설비내의 염산 자유산 농도에 따른 인히비터 농도 제어방법을 제공함에 그 목적이 있다.The present invention is invented to solve the problems of the conventional hydrochloric acid and inhibitor supply control method in view of the above situation, free acid obtained on-line without supplying the inhibitor supply in proportion to the total hydrochloric acid concentration It is an object of the present invention to provide an inhibitor concentration control method according to the concentration of hydrochloric acid in the pickling facility which reduces the pickling and peracid by supplying the inhibitor in proportion to the concentration.
도 1은 산세설비의 개략도,1 is a schematic diagram of a pickling plant,
도 2는 종래의 염산과 인히비터 공급제어를 나타낸 순서도,2 is a flow chart showing a conventional hydrochloric acid and inhibitor supply control,
도 3은 실작업 염산/인히비터 농도 추이곡선을 나타낸 그래프,3 is a graph showing the actual working hydrochloric acid / inhibitor concentration curve,
도 4는 본 발명에 따른 염산과 인히비터 공급제어를 나타낸 순서도,4 is a flow chart showing hydrochloric acid and inhibitor supply control according to the present invention,
도 5는 비중 및 전기전도도에 따른 자유산농도를 나타낸 그래프이다.5 is a graph showing the free acid concentration according to specific gravity and electrical conductivity.
< 도면의 주요부분에 대한 부호의 설명 ><Description of Symbols for Major Parts of Drawings>
11 : 산회수 설비 12 : 신산 저장탱크11: acid recovery equipment 12: Sinsan storage tank
13, 14, 15 : 1, 2, 3번 염산순환탱크13, 14, 15: 1, 2, 3 hydrochloric acid circulation tank
17, 18, 19 : 1, 2, 3번 산세탱크 20, 21 : 캐스케이드 펌프17, 18, 19: 1, 2, 3 pickling tanks 20, 21: cascade pump
22, 23, 24 : 염산공급탱크 25 : 인히비터 저장탱크22, 23, 24: hydrochloric acid supply tank 25: inhibitor storage tank
26 : 인히비터 공급펌프 27 : 열연강판26: Inhibitor supply pump 27: Hot rolled steel sheet
30 : 라인 PLC 31 : 속도평균(VA)30: line PLC 31: speed average (V A )
32 : SCC 33 : 예상 염산공급량(Q1)32: SCC 33: estimated hydrochloric acid supply (Q 1 )
34 : DDT CRT 35 : 최종 염산공급량(Q)34: DDT CRT 35: final hydrochloric acid supply (Q)
36 : 염산유량 조절계 37, 41, 67 : 조절밸브36 hydrochloric acid flow rate controller 37, 41, 67: control valve
38, 42, 63, 68 : 유량계 39 : 인히비터 투입량(F)38, 42, 63, 68: Flow meter 39: Inhibitor input amount (F)
40, 66 : 인히비터 유량조절계 60 : 밀도 측정계40, 66: Inhibitor flow controller 60: Density measuring instrument
61 : 전기전도계 62 : 자유산농도 계산61: conductivity meter 62: free acid concentration calculation
64 : 자유산 투입량(P) 65 : 인히비터 투입량(D)64: free acid input (P) 65: inhibitor input (D)
상기한 목적을 달성하기 위한 본 발명 산세설비내의 염산 자유산 농도에 따른 인히비터 농도 제어방법은 1,2,3번 염산순환탱크(13),(14),(15)중 3번 염산순환탱크(15)에 설치한 밀도측정계(60)와 전기전도계(61)로 부터 비중 및 전기전도도를 측정하여 온라인 상태에서 자유산농도를 계산하는 단계와; 유량계(63)로 부터 측정한 3번 염산순환탱크(15)에 공급한 염산량과 상기 자유산농도로 자유산 투입량(P)을 계산하는 단계; 상기 자유산 투입량(P)에 비례하는 인히비터투입량(D)을 설정하는 단계 및; 상기 설정된 인히비터투입량(D)이 3번 산세탱크(19)에 투입되도록 인히비터 유량조절계(66)와 조절밸브(67) 및 유량계(68)를 제어하는 단계로 이루어진 것을 특징으로 한다.Inhibitor concentration control method according to the hydrochloric acid free acid concentration in the pickling facility of the present invention for achieving the above object is the hydrochloric acid circulation tank 3, 1,2, 3 hydrochloric acid circulation tank (13), (14), (15) Calculating a free acid concentration in an online state by measuring specific gravity and electrical conductivity from the density measuring device 60 and the electric conductivity meter 61 installed in (15); Calculating the amount of hydrochloric acid supplied to the third hydrochloric acid circulation tank 15 measured from the flowmeter 63 and the free acid input amount P as the free acid concentration; Setting an inhibitor input amount (D) proportional to the free acid input amount (P); It characterized in that it comprises a step of controlling the inhibitor flow controller 66, the control valve 67 and the flow meter 68 so that the set the input injection amount (D) to the pickling tank 19.
이하 첨부도면을 참조하여 본 발명 산세설비내의 염산 자유산 농도에 따른 인히비터 농도 제어방법을 상세하게 설명한다.Hereinafter, the inhibitor concentration control method according to the hydrochloric acid free acid concentration in the pickling plant of the present invention will be described in detail with reference to the accompanying drawings.
도 4는 본 발명에 따른 염산과 인히비터 공급제어를 나타낸 순서도로서, 3번 염산순환탱크(15)에 염산의 비중을 측정하는 밀도측정계(60)와 전기전도계(61)를 설치하여 온라인(On-Line) 상태에서 자동으로 자유산농도를 계산할 수 있다.4 is a flow chart showing hydrochloric acid and inhibitor supply control according to the present invention, the density measurement system 60 and the electroconductor 61 for measuring the specific gravity of hydrochloric acid in the third hydrochloric acid circulation tank 15 is installed online ( Free acid concentration can be calculated automatically in On-Line state.
한편 3번 염산순환탱크(15)에서 3번 산세탱크(19)로 공급되는 염산량을 유량계(63)를 통해 알수 있으므로 이로부터 자유산 투입량(P)을 계산할 수 있다. 따라서 자유산 투입량(P)과 비례한 인히비터 투입량(D)을 인히비터 유량조절계(66), 조절밸브(68), 유량계(68)를 통해 제어할 수 있으며, 이러한 제어과정은 모두 자동으로 이루어지게 된다.Meanwhile, since the amount of hydrochloric acid supplied from the third hydrochloric acid circulation tank 15 to the third pickling tank 19 can be known through the flow meter 63, the free acid input amount P can be calculated therefrom. Therefore, the inhibitor input amount (D) proportional to the free acid input amount (P) can be controlled through the inhibitor flow controller 66, the control valve 68, the flow meter 68, and all of these control processes are made automatically. You lose.
상기한 본 발명의 방법으로 구한 자유산대비 인히비터농도(53)를 도 3에 나타내 보았다. 도 3으로 부터 알 수 있는 바와 같이 본 발명의 방법에 의하면 자유산농도(51)와 인히비터농도를 비례적으로 공급할 수 있기 때문에 최적의 산세조건이 가능하게 되는 것이다.3 shows the inhibitor concentration 53 compared to the free acid obtained by the method of the present invention. As can be seen from Fig. 3, the method of the present invention can supply the free acid concentration 51 and the inhibitor concentration proportionally, so that optimal pickling conditions are possible.
도 5는 비중측정계와 전기전도계에서 측정한 값에 따른 자유산농도의 분포를 나타낸 그래프로서, 전기전도도와 비중을 측정하면 도 5의 그래프로부터 자유산농도가 결정된다는 것을 알 수 있다.FIG. 5 is a graph showing the distribution of free acid concentrations according to the values measured by the specific gravity meter and the electroconductor. When the electrical conductivity and the specific gravity are measured, the free acid concentration may be determined from the graph of FIG. 5.
상기한 바와 같이 본 발명에 의하면 종래의 총염산농도에 대비한 인히비터 공급이 아닌 자유산농도에 비례한 인히비터의 공급이 가능하기 때문에 최적의 산세조건을 제공할 수 있으므로 과산세 및 미산세를 방지하여 열연강판의 품질을 향상할 수 있는 장점이 있다.As described above, according to the present invention, it is possible to supply an inhibitor which is proportional to the free acid concentration rather than the inhibitor supply compared to the conventional total hydrochloric acid concentration, so that it is possible to provide an optimum pickling condition. There is an advantage to improve the quality of the hot rolled steel sheet by preventing.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100685029B1 (en) * | 2005-06-20 | 2007-02-20 | 주식회사 포스코 | Apparatus and method for automatic managing acid concentration on stainless anealing and pickling line |
| KR100899687B1 (en) * | 2002-08-23 | 2009-05-28 | 주식회사 포스코 | Descaling method of hot coil |
| CN107385454A (en) * | 2017-07-31 | 2017-11-24 | 中冶赛迪工程技术股份有限公司 | A kind of inexpensive hot-strip acid washing method |
| WO2018062860A3 (en) * | 2016-09-27 | 2018-05-24 | 주식회사 포스코 | Uniform treatment apparatus and pickling apparatus |
| WO2018117541A1 (en) * | 2016-12-22 | 2018-06-28 | 주식회사 포스코 | Pickling apparatus |
| KR20190067462A (en) * | 2017-12-07 | 2019-06-17 | 주식회사 포스코 | Pickling Device and Pickling Method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5469526A (en) * | 1977-11-15 | 1979-06-04 | Sumitomo Metal Ind Ltd | Control method for pickling solution |
| JPH05263279A (en) * | 1992-03-19 | 1993-10-12 | Nisshin Steel Co Ltd | Controlling method for bath of nitric acid and hydrofluoric acid for descaling stainless steel strip and continuously descaling equipment |
| JPH07294509A (en) * | 1994-04-25 | 1995-11-10 | Kawasaki Steel Corp | Analysis of mixed acid and control of pickling solution |
-
1999
- 1999-12-29 KR KR1019990064535A patent/KR20010064358A/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5469526A (en) * | 1977-11-15 | 1979-06-04 | Sumitomo Metal Ind Ltd | Control method for pickling solution |
| JPH05263279A (en) * | 1992-03-19 | 1993-10-12 | Nisshin Steel Co Ltd | Controlling method for bath of nitric acid and hydrofluoric acid for descaling stainless steel strip and continuously descaling equipment |
| JPH07294509A (en) * | 1994-04-25 | 1995-11-10 | Kawasaki Steel Corp | Analysis of mixed acid and control of pickling solution |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100899687B1 (en) * | 2002-08-23 | 2009-05-28 | 주식회사 포스코 | Descaling method of hot coil |
| KR100685029B1 (en) * | 2005-06-20 | 2007-02-20 | 주식회사 포스코 | Apparatus and method for automatic managing acid concentration on stainless anealing and pickling line |
| WO2018062860A3 (en) * | 2016-09-27 | 2018-05-24 | 주식회사 포스코 | Uniform treatment apparatus and pickling apparatus |
| WO2018117541A1 (en) * | 2016-12-22 | 2018-06-28 | 주식회사 포스코 | Pickling apparatus |
| CN107385454A (en) * | 2017-07-31 | 2017-11-24 | 中冶赛迪工程技术股份有限公司 | A kind of inexpensive hot-strip acid washing method |
| KR20190067462A (en) * | 2017-12-07 | 2019-06-17 | 주식회사 포스코 | Pickling Device and Pickling Method |
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