WO2023045618A1 - Process and device for reducing consumption of cold-rolling acid - Google Patents

Process and device for reducing consumption of cold-rolling acid Download PDF

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Publication number
WO2023045618A1
WO2023045618A1 PCT/CN2022/112394 CN2022112394W WO2023045618A1 WO 2023045618 A1 WO2023045618 A1 WO 2023045618A1 CN 2022112394 W CN2022112394 W CN 2022112394W WO 2023045618 A1 WO2023045618 A1 WO 2023045618A1
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Prior art keywords
acid
rinsing
tank
stage
strip
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PCT/CN2022/112394
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French (fr)
Chinese (zh)
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黎浩
廖砚林
唐文
李素珍
周云根
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中冶南方工程技术有限公司
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Publication of WO2023045618A1 publication Critical patent/WO2023045618A1/en

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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
    • 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
    • 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
    • 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
    • C23G3/023—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by spraying

Definitions

  • the invention relates to the technical field of steel strip pickling, in particular to a process and equipment for reducing the consumption of acid solution in cold rolling.
  • the pre-rinsing nozzle 6' pre-rinses the surface of the strip 14', the pre-rinsing water comes from the first-stage rinsing tank 8', the pre-rinsing water falls into the pre-rinsing tank 7', and then flows into the rinsing wastewater by gravity flow In the tank 12', the rinsing wastewater pump 13' periodically discharges the wastewater collected in the rinsing wastewater tank 12' to the acid regeneration station for partial reuse.
  • the strip 14' After pre-rinsing, the strip 14' enters the first-stage rinsing tank 8' for further rinsing until passing through the last-stage rinsing tank. New water is continuously replenished to the last level of rinsing tank at a certain flow rate, and cascaded forward 11' step by step to realize the dynamic update of the rinsing water quality in each level of rinsing tank, and the cascading flow 11' finally enters the pre-rinsing tank 7' , and flow into the rinsing waste water tank 12' in the manner of gravity flow, and the rinsing waste water pump 13' periodically discharges the waste water collected in the rinsing waste water tank 12' to the acid regeneration station for reuse of the acid regeneration part.
  • the pre-rinsing wastewater with high acid content and the cascade rinsing wastewater are sent to the acid regeneration station for partial reuse.
  • the improvement of the acid regeneration process it has developed to There is almost no need to consume the rinsing wastewater supplied by the unit, which is directly discharged to the wastewater treatment station, resulting in the loss of acid in the rinsing wastewater.
  • the squeezing roller will throw part of the high-concentration acid solution directly into the pre-rinsing tank during the high-speed rotation process, which will also cause the loss of acid solution.
  • the pre-rinsing uses the first-stage rinsing water with poor water quality, and the pressure of the first-stage rinsing water is not high, the high-concentration acid solution on the surface of the strip cannot be removed in large quantities at the first time and is brought into the subsequent rinsing tank In the process, the amount of dynamic water replenishment used to maintain the water quality in the rinsing tanks at all levels is too large.
  • the invention aims to provide a process for reducing the consumption of acid solution in cold rolling, so as to reduce the acid consumption in the strip pickling process.
  • a process for reducing the consumption of acid solution in cold rolling which is used to reduce the consumption of acid solution in the rinsing stage after strip pickling, comprising the following steps:
  • the strip After the strip is output from the final acid tank, it enters the multi-stage rinsing tank for rinsing.
  • the strip enters the first-level to the last-level rinsing tank in sequence.
  • the rinsing water falls into the first-stage rinsing tank, it is pumped out by the first-stage rinsing circulation pump and pressurized, and then rinses the surface of the strip through the first-stage rinsing nozzle again until the strip comes out of the last stage.
  • Level rinsing tank; the rinsing water in the first level rinsing tank finally flows into the acid mist purification tower continuously through the overflow pipeline.
  • the rinsing water in the multi-stage rinsing tank flows from the rear section to the front section in a cascade flow manner.
  • the acid-containing wastewater generated after the acid mist is circulated and absorbed in the acid mist purification tower is periodically discharged to the waste water treatment station for treatment through the waste water pump.
  • the acid water material balance is used to dynamically adjust the flow rate and concentration of regenerated acid supplemented into the acid tank.
  • the present invention also provides an equipment for reducing the consumption of acid solution in cold rolling, which includes multi-section pickling tanks and multi-section rinsing tanks arranged in sequence along the strip traveling direction, and the last section of the multi-section pickling tanks is provided with extrusion
  • the pre-rinsing nozzle is equipped with nozzles for rinsing both sides of the strip.
  • the pre-rinsing nozzle is connected to a high-pressure pump.
  • the acid tank in the final stage is connected to the acid tank Connected by pipelines, the acid tank pumps the pickling liquid into the final acid tank through the acid pump;
  • the first-stage rinse tank of the multi-stage rinse tank is provided with a first-stage rinse nozzle, the first
  • the first-stage rinsing nozzle is provided with a spray head for first-stage rinsing on the front and back of the strip, and the rinsing liquid in the first-stage rinsing tank is connected to the first-stage rinsing nozzle through the first-stage rinsing circulation pump.
  • the first-stage rinsing tank is also connected with the acid mist purification tower, and the acid mist purification tower is connected with the waste water treatment station.
  • the first-stage rinsing tank is provided with an overflow pipeline, and the rinsing water in the first-stage rinsing tank flows into the acid mist purification tower through the overflow pipeline.
  • Integrating the final acid tank and the pre-rinse tank in the prior art can directly reuse the pre-rinse water and the acid liquid thrown out by the squeeze roller, which can greatly reduce the ton of steel in the case of an acid regeneration station Acid consumption;
  • the high-pressure pre-rinsing technology can remove the high-concentration acid solution on the surface of the strip to the greatest extent, not only can reuse more acid solution, but also reduce the consumption of new water in the subsequent rinsing section;
  • Low-concentration rinsing wastewater is first discharged to the acid mist purification tower for secondary use, and the final acid-containing wastewater is directly discharged to the wastewater treatment station, which not only reduces the fresh water consumption of the acid mist purification tower, but also avoids the rinsing wastewater from The acid regeneration station transfers, thereby reducing energy consumption.
  • Fig. 1 shows a schematic diagram of the process of pickling and rinsing of steel strip in the prior art.
  • Fig. 2 shows a schematic diagram of the process of pickling and rinsing of steel strip according to the present invention.
  • the invention provides a process and equipment for reducing the consumption of cold-rolled acid solution, wherein as shown in Figure 2, the equipment includes acid tank 1, acid pump 2, final acid tank 3, squeeze roller 4, regenerated acid replenishment Pipeline 5, pre-rinsing nozzle 6, first-stage rinsing tank 8, first-stage rinsing nozzle 9, first-stage rinsing circulation pump 10, ladder flow rinsing water 11, acid mist purification tower 12, waste water pump 13, belt Material 14, high pressure pump 15 and overflow pipeline 16.
  • the final acid tank 3 and the multi-stage rinsing tank are sequentially arranged along the traveling direction of the strip 14 , and the rinsing water in the multi-stage rinsing tank flows from the back section to the front section in the manner of cascade flow 11 .
  • the final acid tank 3 is provided with a squeeze roller 4 and a pre-rinse nozzle 6 located at the rear of the squeeze roller 4.
  • the pre-rinse nozzle 6 is provided with a nozzle for pre-rinsing both sides of the strip 14.
  • the pre-rinse The spray pipe 6 is connected with the high-pressure pump 15, and the high-pressure pump 15 delivers the rinsing water to the pre-rinse spray pipe 6, and sprays it from the nozzle on the pre-rinse spray pipe 6, so that the strip 14 is squeezed and pickled after the strip 14 passes through the wring roller 4.
  • the pre-rinsing action is carried out after the liquid is removed, the final acid tank 3 is connected with the acid tank 1 through pipelines, and the pickling liquid in the acid tank 1 can be pumped into the final acid tank 3 by the acid pump 2 to realize the pickling liquid recycle.
  • the first-stage rinsing tank 8 of the multi-stage rinsing tank is provided with a first-stage rinsing nozzle 9, and the first-stage rinsing nozzle 9 is provided with a nozzle for performing a first-stage rinsing on both sides of the strip 14.
  • the first-stage rinsing The rinsing liquid in the tank 8 is connected to the first-stage rinsing spray pipe 9 through the first-stage rinsing circulation pump 10 , so as to realize the circulation of the rinsing liquid in the first-stage rinsing tank 8 .
  • the first-stage rinsing tank 8 is also connected to the acid mist purification tower 12, and the rinsing liquid treated by the acid mist purification tower 12 is transported to the waste water treatment station for treatment through the waste water pump 13, and the regenerated acid after the acid regeneration station is passed through
  • the regenerated acid replenishment pipeline 5 is connected with the acid tank 1 .
  • the first-stage rinsing tank 8 is provided with an overflow pipeline 16 , and the rinsing water in the cascade flow 11 finally flows continuously into the acid mist purification tower 12 through the overflow pipeline 16 .
  • the processing process of the strip in the equipment is as follows:
  • the continuously running strip 14 is pickled in the final acid tank 3, it is squeezed dry by the squeeze roller 4, and most of the high-concentration acid solution on the surface is removed, and then the solid cone and fan-shaped sprayed by the pre-rinsing nozzle 6 The high-speed jet impact, the acid residue on the surface is reduced to the minimum level.
  • the acid liquid squeezed off by the squeezing roller 4, the acid liquid thrown out by the high-speed rotation of the squeezing roller 4, and the acid liquid washed down from the surface of the strip 14 by the pre-rinsing nozzle 6 all fall into the final stage In the acid tank 3, it flows back into the acid tank 1 in the form of gravity flow, and after being mixed with the acid liquid in the acid tank 1, it is drawn out by the acid pump 2 and re-injected into the final acid tank 3 to pickle the strip 14 and circulate back and forth.
  • the rinsing water sprayed from the pre-rinsing nozzle 6 is continuously injected into the acid tank 1, which dilutes the acid concentration in the acid tank 1.
  • the regenerated acid replenishment pipeline 5 The flow rate and concentration of the regenerated acid added to the acid tank 1 are dynamically adjusted.
  • the rinsing water used in the pre-rinsing nozzle 6 is pressurized by the high-pressure pump 15 and then converted into a high-speed jet by the nozzle on the pre-rinsing nozzle 6 to wash the surface of the strip 14, and the strip 14 enters the first stage of rinsing to the greatest extent.
  • the high-concentration acid solution on its surface was removed, which reduced the subsequent rinsing load and saved the replenishment of new water; Rinse the surface of the strip 14.
  • the rinsing water falls into the first-stage rinsing tank 8, it is pumped out by the first-stage rinsing circulation pump 10 and pressurized, and then rinses the surface of the strip 14 through the first-stage rinsing nozzle 9 again. , reciprocating, until the strip 14 out of the last level of rinsing tank.
  • the residual low-concentration acid solution on the surface of the running strip 14 is continuously washed down, and the acid content of the rinsing water at each level gradually increases.
  • a certain flow rate is continuously replenished to the last stage of the rinsing tank, and it moves forward step by step in the manner of cascade flow, so as to realize the dynamic update of the rinsing water quality in the rinsing tanks of all levels.
  • the first-stage rinsing tank 8 is provided with an overflow pipeline 16, and the rinsing water of the cascade flow 11 finally flows continuously into the acid mist purification tower 12 through the overflow pipeline 16, and the acid-containing wastewater generated after the acid mist is circulated and absorbed in the tower passes through the
  • the waste water pump 13 periodically discharges to the waste water treatment station for treatment.
  • Integrating the final acid tank and the pre-rinse tank in the prior art can directly reuse the pre-rinse water and the acid liquid thrown out by the squeeze roller, which can greatly reduce the ton of steel in the case of an acid regeneration station Acid consumption;
  • the high-pressure pre-rinsing technology can remove the high-concentration acid solution on the surface of the strip to the greatest extent, not only can reuse more acid solution, but also reduce the consumption of new water in the subsequent rinsing section;
  • Low-concentration rinsing wastewater is first discharged to the acid mist purification tower for secondary use, and the final acid-containing wastewater is directly discharged to the wastewater treatment station, which not only reduces the fresh water consumption of the acid mist purification tower, but also avoids the rinsing wastewater from The acid regeneration station transfers, thereby reducing energy consumption.

Abstract

The present invention relates to a process and a device for reducing the consumption of cold-rolling acid. A final section acid tank and a pre-rinse tank are integrated, such that the pre-rinse water and acid spun out by a squeeze roller can be directly reused, and acid consumption per ton of steel can be greatly reduced when there is an acid regeneration station. Furthermore, low-concentration rinsing wastewater is first collected to an acid mist purification system to purify and absorb acid mist, and the generated wastewater is directly discharged to a wastewater treatment station, thereby avoiding transfer from the acid regeneration station and also reducing the water consumption for acid mist absorption.

Description

一种降低冷轧酸液消耗的工艺及其设备A process and equipment for reducing cold rolling acid consumption 技术领域technical field
本发明涉及带钢酸洗技术领域，具体是涉及一种降低冷轧酸液消耗的工艺及其设备。The invention relates to the technical field of steel strip pickling, in particular to a process and equipment for reducing the consumption of acid solution in cold rolling.
背景技术Background technique
带钢在进行冷轧前需要通过酸洗将其表面的氧化铁皮去除干净，在酸洗结束后需要对带材表面进行多级漂洗，以彻底去除带材表面的酸液残留，防止烘干后带材表面生锈。现有带钢的酸洗和漂洗的工艺过程如图1所示。Before cold rolling, the steel strip needs to be pickled to remove the oxide scale on its surface. After the pickling, the surface of the strip needs to be rinsed in multiple stages to completely remove the acid residue on the surface of the strip and prevent it from drying after drying. The surface of the strip is rusted. The technological process of pickling and rinsing of the existing strip is shown in Figure 1.
连续运行的带材14′在末段酸槽3′中酸洗结束后，经过挤干辊4′挤干后，带材14′表面大部分酸液掉落进入酸槽3′中，然后通过预漂洗喷管6′对带材14′表面进行预漂洗，预漂洗水来自第一级漂洗槽8′，预漂洗水掉落进入预漂洗槽7′中，再以重力流的方式流入漂洗废水罐12′中，漂洗废水泵13′将漂洗废水罐12′中收集的废水周期性的排至酸再生站进行部分回用。经预漂洗后，带材14′进入第一级漂洗槽8′作进一步漂洗，直到经过最后一级漂洗槽。新水以一定流量持续补充到最后一级漂洗槽，并逐级往前梯流11′，实现对各级漂洗槽中漂洗水水质的动态更新，梯流11′最终进入预漂洗槽7′中，并以重力流的方式流入漂洗废水罐12′中，漂洗废水泵13′周期性的将收集在漂洗废水罐12′中的废水排往酸再生站，供酸再生部分回用。After the continuously running strip 14' is pickled in the final acid tank 3', after being squeezed dry by the wringer roller 4', most of the acid liquid on the surface of the strip 14' falls into the acid tank 3', and then passes through The pre-rinsing nozzle 6' pre-rinses the surface of the strip 14', the pre-rinsing water comes from the first-stage rinsing tank 8', the pre-rinsing water falls into the pre-rinsing tank 7', and then flows into the rinsing wastewater by gravity flow In the tank 12', the rinsing wastewater pump 13' periodically discharges the wastewater collected in the rinsing wastewater tank 12' to the acid regeneration station for partial reuse. After pre-rinsing, the strip 14' enters the first-stage rinsing tank 8' for further rinsing until passing through the last-stage rinsing tank. New water is continuously replenished to the last level of rinsing tank at a certain flow rate, and cascaded forward 11' step by step to realize the dynamic update of the rinsing water quality in each level of rinsing tank, and the cascading flow 11' finally enters the pre-rinsing tank 7' , and flow into the rinsing waste water tank 12' in the manner of gravity flow, and the rinsing waste water pump 13' periodically discharges the waste water collected in the rinsing waste water tank 12' to the acid regeneration station for reuse of the acid regeneration part.
在带材酸洗及漂洗工艺中，含酸量较高的预漂洗废水和梯流的漂洗废水一起被送往酸再生站进行部分回用，但随着酸再生工艺的改进，目前已经发展到几乎不需要消耗机组供给的漂洗废水，这些漂洗废水直接被排至废水处理站，造成漂洗废水中酸液的损失。带材出末段酸槽时，在挤干过程中，挤干辊在高速转动过程中会将部分高浓度酸液直接甩进预漂洗槽中，也会造成酸液的损失。 由于预漂洗采用的是水质较差的第一级漂洗水，且第一级漂洗水压力不高，使得带材表面的高浓度酸液不能被第一时间大量去除而被带入后续的漂洗槽中，还造成用于维持各级漂洗槽中水质的动态补水量偏大。In the strip pickling and rinsing process, the pre-rinsing wastewater with high acid content and the cascade rinsing wastewater are sent to the acid regeneration station for partial reuse. However, with the improvement of the acid regeneration process, it has developed to There is almost no need to consume the rinsing wastewater supplied by the unit, which is directly discharged to the wastewater treatment station, resulting in the loss of acid in the rinsing wastewater. When the strip leaves the final acid tank, during the drying process, the squeezing roller will throw part of the high-concentration acid solution directly into the pre-rinsing tank during the high-speed rotation process, which will also cause the loss of acid solution. Since the pre-rinsing uses the first-stage rinsing water with poor water quality, and the pressure of the first-stage rinsing water is not high, the high-concentration acid solution on the surface of the strip cannot be removed in large quantities at the first time and is brought into the subsequent rinsing tank In the process, the amount of dynamic water replenishment used to maintain the water quality in the rinsing tanks at all levels is too large.
随着工业节能降耗要求的不断加强，以及各生产企业对于降低吨钢能耗的需求日趋强烈，开发出一种能够降低酸液消耗的工艺将有广阔的市场前景。With the continuous strengthening of industrial energy saving and consumption reduction requirements, and the increasing demand of various production enterprises for reducing energy consumption per ton of steel, the development of a process that can reduce acid consumption will have broad market prospects.
发明内容Contents of the invention
本发明旨在提供一种降低冷轧酸液消耗的工艺，以降低带钢酸洗过程中的酸耗。The invention aims to provide a process for reducing the consumption of acid solution in cold rolling, so as to reduce the acid consumption in the strip pickling process.
具体方案如下：The specific plan is as follows:
一种降低冷轧酸液消耗的工艺，其用于减低带材酸洗后漂洗阶段的酸液消耗，包括以下步骤：A process for reducing the consumption of acid solution in cold rolling, which is used to reduce the consumption of acid solution in the rinsing stage after strip pickling, comprising the following steps:
S1、连续运行的带材在末段酸槽中酸洗结束后，在末段酸槽内先经过挤干辊挤干，再经预漂洗喷管进行预清洗，被挤干辊挤落的酸液、挤干辊高速转动甩出的酸液以及被预漂洗喷管从带材表面冲刷下来的酸液都落入末段酸槽中，且以重力流的方式回流进至酸罐中，同酸罐内的酸液混合后被酸泵抽出重新注入末段酸槽中对带材进行酸洗；S1. After the continuously running strip is pickled in the final acid tank, it is first squeezed dry by the wringer roller in the last acid tank, and then pre-cleaned by the pre-rinsing nozzle. The acid squeezed by the wringer roller The liquid, the acid liquid thrown out by the high-speed rotation of the squeezing roller and the acid liquid washed off the surface of the strip by the pre-rinsing nozzle all fall into the final acid tank, and flow back into the acid tank by gravity flow, and at the same time After the acid solution in the acid tank is mixed, it is pumped out by the acid pump and re-injected into the final acid tank to pickle the strip;
S2、带材从末段酸槽输出后进入至多级漂洗槽内漂洗，带材依序进入第一级至最后一级漂洗槽，在第一级漂洗槽内经第一级漂洗喷管对带材表面进行漂洗，漂洗水落入第一级漂洗槽后，经第一级漂洗循环泵抽出并加压后，重新通过第一级漂洗喷管对带材表面进行漂洗，直到带材出最后一级漂洗槽；第一级漂洗槽内的漂洗水最终通过溢流管路持续流入酸雾净化塔中。S2. After the strip is output from the final acid tank, it enters the multi-stage rinsing tank for rinsing. The strip enters the first-level to the last-level rinsing tank in sequence. After the rinsing water falls into the first-stage rinsing tank, it is pumped out by the first-stage rinsing circulation pump and pressurized, and then rinses the surface of the strip through the first-stage rinsing nozzle again until the strip comes out of the last stage. Level rinsing tank; the rinsing water in the first level rinsing tank finally flows into the acid mist purification tower continuously through the overflow pipeline.
进一步的，所述多级漂洗槽的漂洗水以梯流的方式由后段往前段方向流动。Further, the rinsing water in the multi-stage rinsing tank flows from the rear section to the front section in a cascade flow manner.
进一步的，在酸雾净化塔内循环吸收酸雾后产生的含酸废水通过废水泵周 期性的排往废水处理站进行处理。Further, the acid-containing wastewater generated after the acid mist is circulated and absorbed in the acid mist purification tower is periodically discharged to the waste water treatment station for treatment through the waste water pump.
进一步的，利用酸水物料衡算动态调整往酸罐内补充的再生酸的流量和浓度。Further, the acid water material balance is used to dynamically adjust the flow rate and concentration of regenerated acid supplemented into the acid tank.
本发明还提供了一种降低冷轧酸液消耗的设备，包括沿带材行进方向依序设置的多段酸洗槽和多段漂洗槽，所述多段酸洗槽的末段酸槽内设置有挤干辊以及位于挤干辊后段的预漂洗喷管，预漂洗喷管上设置有对带材正反两面冲洗的喷头，预漂洗喷管与高压泵相连，所述末段酸槽与酸罐通过管路相连接，所述酸罐通过酸泵将酸洗液泵入至末段酸槽内；所述多级漂洗槽的第一级漂洗槽内设置有第一级漂洗喷管，第一级漂洗喷管上设置有对带材正反两面进行一级漂洗的喷头，第一级漂洗槽内的漂洗液通过第一级漂洗循环泵与第一级漂洗喷管相连接，所述第一级漂洗槽还与酸雾净化塔相连接，所述酸雾净化塔与废水处理站相连接。The present invention also provides an equipment for reducing the consumption of acid solution in cold rolling, which includes multi-section pickling tanks and multi-section rinsing tanks arranged in sequence along the strip traveling direction, and the last section of the multi-section pickling tanks is provided with extrusion The drying roll and the pre-rinsing nozzle located at the rear of the squeeze roller. The pre-rinsing nozzle is equipped with nozzles for rinsing both sides of the strip. The pre-rinsing nozzle is connected to a high-pressure pump. The acid tank in the final stage is connected to the acid tank Connected by pipelines, the acid tank pumps the pickling liquid into the final acid tank through the acid pump; the first-stage rinse tank of the multi-stage rinse tank is provided with a first-stage rinse nozzle, the first The first-stage rinsing nozzle is provided with a spray head for first-stage rinsing on the front and back of the strip, and the rinsing liquid in the first-stage rinsing tank is connected to the first-stage rinsing nozzle through the first-stage rinsing circulation pump. The first-stage rinsing tank is also connected with the acid mist purification tower, and the acid mist purification tower is connected with the waste water treatment station.
进一步的，所述第一级漂洗槽设置有溢流管路，所述第一级漂洗槽内的漂洗水通过溢流管路流入至所述酸雾净化塔中。Further, the first-stage rinsing tank is provided with an overflow pipeline, and the rinsing water in the first-stage rinsing tank flows into the acid mist purification tower through the overflow pipeline.
本发明提供的降低冷轧酸液消耗的工艺及其设备与现有技术相比较具有以下优点：Compared with the prior art, the process and equipment for reducing cold-rolling acid consumption provided by the present invention have the following advantages:
1、将现有技术中的末段酸槽和预漂洗槽一体化，可以直接回用预漂洗水和被挤干辊甩出的酸液，在有酸再生站的情况下能大幅降低吨钢酸耗；1. Integrating the final acid tank and the pre-rinse tank in the prior art can directly reuse the pre-rinse water and the acid liquid thrown out by the squeeze roller, which can greatly reduce the ton of steel in the case of an acid regeneration station Acid consumption;
2、采用高压预漂洗技术，可以最大程度的去除带材表面的高浓度酸液，不仅能回用更多的酸液，还能减少后续漂洗段新水的消耗；2. The high-pressure pre-rinsing technology can remove the high-concentration acid solution on the surface of the strip to the greatest extent, not only can reuse more acid solution, but also reduce the consumption of new water in the subsequent rinsing section;
3、利用酸水物料衡算，动态调整往酸罐内补充的再生酸的流量和浓度，可以保证酸罐在持续收集预漂洗水的情况下浓度能够维持平稳；3. Using acid water material balance, dynamically adjust the flow rate and concentration of regenerated acid replenished into the acid tank, so as to ensure that the acid tank can maintain a stable concentration under the condition of continuous collection of pre-rinsing water;
4、低浓度漂洗废水先排至酸雾净化塔进行二次利用，最终产生的含酸废水 直接排往废水处理站，既降低了酸雾净化塔的新水耗量，又避免了漂洗废水从酸再生站中转，从而降低了能耗。4. Low-concentration rinsing wastewater is first discharged to the acid mist purification tower for secondary use, and the final acid-containing wastewater is directly discharged to the wastewater treatment station, which not only reduces the fresh water consumption of the acid mist purification tower, but also avoids the rinsing wastewater from The acid regeneration station transfers, thereby reducing energy consumption.
附图说明Description of drawings
图1示出了现有技术中带钢的酸洗和漂洗的工艺过程示意图。Fig. 1 shows a schematic diagram of the process of pickling and rinsing of steel strip in the prior art.
图2示出了本发明的带钢的酸洗和漂洗的工艺过程示意图。Fig. 2 shows a schematic diagram of the process of pickling and rinsing of steel strip according to the present invention.
具体实施方式Detailed ways
为进一步说明各实施例，本发明提供有附图。这些附图为本发明揭露内容的一部分，其主要用以说明实施例，并可配合说明书的相关描述来解释实施例的运作原理。配合参考这些内容，本领域普通技术人员应能理解其他可能的实施方式以及本发明的优点。图中的组件并未按比例绘制，而类似的组件符号通常用来表示类似的组件。To further illustrate the various embodiments, the present invention is provided with accompanying drawings. These drawings are a part of the disclosure of the present invention, which are mainly used to illustrate the embodiments, and can be combined with related descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should understand other possible implementations and advantages of the present invention. Components in the figures are not drawn to scale, and similar component symbols are generally used to denote similar components.
现结合附图和具体实施方式对本发明进一步说明。The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.
本发明提供了一种降低冷轧酸液消耗的工艺及其设备，其中如图2所示的，设备包括酸罐1、酸泵2、末段酸槽3、挤干辊4、再生酸补充管路5、预漂洗喷管6、第一级漂洗槽8、第一级漂洗喷管9、第一级漂洗循环泵10、梯流漂洗水11、酸雾净化塔12、废水泵13、带材14、高压泵15和溢流管路16。The invention provides a process and equipment for reducing the consumption of cold-rolled acid solution, wherein as shown in Figure 2, the equipment includes acid tank 1, acid pump 2, final acid tank 3, squeeze roller 4, regenerated acid replenishment Pipeline 5, pre-rinsing nozzle 6, first-stage rinsing tank 8, first-stage rinsing nozzle 9, first-stage rinsing circulation pump 10, ladder flow rinsing water 11, acid mist purification tower 12, waste water pump 13, belt Material 14, high pressure pump 15 and overflow pipeline 16.
末段酸槽3和多级漂洗槽沿带材14的行进方向依序布设，多级漂洗槽的漂洗水以梯流11的方式由后段往前段方向流动。The final acid tank 3 and the multi-stage rinsing tank are sequentially arranged along the traveling direction of the strip 14 , and the rinsing water in the multi-stage rinsing tank flows from the back section to the front section in the manner of cascade flow 11 .
末段酸槽3内设置有挤干辊4以及位于挤干辊4后段的预漂洗喷管6，预漂洗喷管6上设置有对带材14正反两面进行预漂洗的喷头，预漂洗喷管6与高压泵15相连，高压泵15将漂洗水输送至预漂洗喷管6，并从预漂洗喷管6上的喷头喷出，以在带材14经过挤干辊4挤干酸洗液后进行预漂洗动作，末段酸槽3与酸罐1通过管路相连接，且酸罐1的酸洗液能够通过酸泵2泵入至末段酸槽3 内来实现酸洗液的循环使用。The final acid tank 3 is provided with a squeeze roller 4 and a pre-rinse nozzle 6 located at the rear of the squeeze roller 4. The pre-rinse nozzle 6 is provided with a nozzle for pre-rinsing both sides of the strip 14. The pre-rinse The spray pipe 6 is connected with the high-pressure pump 15, and the high-pressure pump 15 delivers the rinsing water to the pre-rinse spray pipe 6, and sprays it from the nozzle on the pre-rinse spray pipe 6, so that the strip 14 is squeezed and pickled after the strip 14 passes through the wring roller 4. The pre-rinsing action is carried out after the liquid is removed, the final acid tank 3 is connected with the acid tank 1 through pipelines, and the pickling liquid in the acid tank 1 can be pumped into the final acid tank 3 by the acid pump 2 to realize the pickling liquid recycle.
多级漂洗槽的第一级漂洗槽8内设置有第一级漂洗喷管9，第一级漂洗喷管9上设置有对带材14正反两面进行一级漂洗的喷头，第一级漂洗槽8内的漂洗液通过第一级漂洗循环泵10与第一级漂洗喷管9相连接，实现第一级漂洗槽8内的漂洗液循环使用。The first-stage rinsing tank 8 of the multi-stage rinsing tank is provided with a first-stage rinsing nozzle 9, and the first-stage rinsing nozzle 9 is provided with a nozzle for performing a first-stage rinsing on both sides of the strip 14. The first-stage rinsing The rinsing liquid in the tank 8 is connected to the first-stage rinsing spray pipe 9 through the first-stage rinsing circulation pump 10 , so as to realize the circulation of the rinsing liquid in the first-stage rinsing tank 8 .
第一级漂洗槽8还与酸雾净化塔12相连接设置，经酸雾净化塔12处理后的漂洗液通过废水泵13输送至废水处理站进行处理，而酸再生站处理后的再生酸通过再生酸补充管路5与酸罐1相连接。第一级漂洗槽8设置有溢流管路16，梯流11的漂洗水最终通过溢流管路16持续流入酸雾净化塔12中。The first-stage rinsing tank 8 is also connected to the acid mist purification tower 12, and the rinsing liquid treated by the acid mist purification tower 12 is transported to the waste water treatment station for treatment through the waste water pump 13, and the regenerated acid after the acid regeneration station is passed through The regenerated acid replenishment pipeline 5 is connected with the acid tank 1 . The first-stage rinsing tank 8 is provided with an overflow pipeline 16 , and the rinsing water in the cascade flow 11 finally flows continuously into the acid mist purification tower 12 through the overflow pipeline 16 .
带材在设备中的处理过程如下：The processing process of the strip in the equipment is as follows:
连续运行的带材14在末段酸槽3中酸洗结束后，经过挤干辊4挤干，表面大部分高浓度酸液被去除，再经预漂洗喷管6喷出的实心锥和扇形的高速射流冲击，表面的酸液残留被降至最低水平。在此过程中，被挤干辊4挤落的酸液、挤干辊4高速转动甩出的酸液以及被预漂洗喷管6从带材14表面冲刷下来的酸液，都落入末段酸槽3中，然后以重力流的方式回流进酸罐1中，同酸罐1内的酸液混合后被酸泵2抽出重新注入末段酸槽3中对带材14进行酸洗，循环往复。After the continuously running strip 14 is pickled in the final acid tank 3, it is squeezed dry by the squeeze roller 4, and most of the high-concentration acid solution on the surface is removed, and then the solid cone and fan-shaped sprayed by the pre-rinsing nozzle 6 The high-speed jet impact, the acid residue on the surface is reduced to the minimum level. During this process, the acid liquid squeezed off by the squeezing roller 4, the acid liquid thrown out by the high-speed rotation of the squeezing roller 4, and the acid liquid washed down from the surface of the strip 14 by the pre-rinsing nozzle 6 all fall into the final stage In the acid tank 3, it flows back into the acid tank 1 in the form of gravity flow, and after being mixed with the acid liquid in the acid tank 1, it is drawn out by the acid pump 2 and re-injected into the final acid tank 3 to pickle the strip 14 and circulate back and forth.
从预漂洗喷管6喷出的漂洗水不断注入酸罐1中，稀释了酸罐1中的酸液浓度，为了控制原来的酸液浓度，根据物料衡算，对经再生酸补充管路5加入到酸罐1中的再生酸的流量和浓度进行动态调整。The rinsing water sprayed from the pre-rinsing nozzle 6 is continuously injected into the acid tank 1, which dilutes the acid concentration in the acid tank 1. In order to control the original acid concentration, according to the material balance, the regenerated acid replenishment pipeline 5 The flow rate and concentration of the regenerated acid added to the acid tank 1 are dynamically adjusted.
预漂洗喷管6所用的漂洗水经过高压泵15加压后再由预漂洗喷管6上的喷嘴转化成高速射流对带材14表面进行冲刷，最大程度的在带材14进入第一级漂洗槽8之前去除了其表面的高浓度酸液，减轻了后续的漂洗负荷，节省了新 水的补充量；带材14接着进入后续的第一级漂洗槽8，由第一级漂洗喷管9对带材14表面进行漂洗，漂洗水落入第一级漂洗槽8后，经第一级漂洗循环泵10抽出并加压后，重新通过第一级漂洗喷管9对带材14表面进行漂洗，循环往复，直到带材14出最后一级漂洗槽。The rinsing water used in the pre-rinsing nozzle 6 is pressurized by the high-pressure pump 15 and then converted into a high-speed jet by the nozzle on the pre-rinsing nozzle 6 to wash the surface of the strip 14, and the strip 14 enters the first stage of rinsing to the greatest extent. Before the tank 8, the high-concentration acid solution on its surface was removed, which reduced the subsequent rinsing load and saved the replenishment of new water; Rinse the surface of the strip 14. After the rinsing water falls into the first-stage rinsing tank 8, it is pumped out by the first-stage rinsing circulation pump 10 and pressurized, and then rinses the surface of the strip 14 through the first-stage rinsing nozzle 9 again. , reciprocating, until the strip 14 out of the last level of rinsing tank.
在漂洗过程中，运行中的带材14表面残留的低浓度酸液被不断冲刷下来，各级漂洗水的含酸量慢慢升高，为了维持漂洗水的水质处于合理的区间，新水以一定流量持续补充到最后一级漂洗槽，并以梯流的方式逐级往前，实现对各级漂洗槽中漂洗水水质的动态更新。第一级漂洗槽8设置有溢流管路16，梯流11的漂洗水最终通过溢流管路16持续流入酸雾净化塔12中，在塔内循环吸收酸雾后产生的含酸废水通过废水泵13周期性的排往废水处理站进行处理。During the rinsing process, the residual low-concentration acid solution on the surface of the running strip 14 is continuously washed down, and the acid content of the rinsing water at each level gradually increases. A certain flow rate is continuously replenished to the last stage of the rinsing tank, and it moves forward step by step in the manner of cascade flow, so as to realize the dynamic update of the rinsing water quality in the rinsing tanks of all levels. The first-stage rinsing tank 8 is provided with an overflow pipeline 16, and the rinsing water of the cascade flow 11 finally flows continuously into the acid mist purification tower 12 through the overflow pipeline 16, and the acid-containing wastewater generated after the acid mist is circulated and absorbed in the tower passes through the The waste water pump 13 periodically discharges to the waste water treatment station for treatment.
本发明提供的降低冷轧酸液消耗的工艺及其设备具有以下优势：The technology and the equipment thereof for reducing the consumption of cold rolling acid solution provided by the present invention have the following advantages:
1、将现有技术中的末段酸槽和预漂洗槽一体化，可以直接回用预漂洗水和被挤干辊甩出的酸液，在有酸再生站的情况下能大幅降低吨钢酸耗；1. Integrating the final acid tank and the pre-rinse tank in the prior art can directly reuse the pre-rinse water and the acid liquid thrown out by the squeeze roller, which can greatly reduce the ton of steel in the case of an acid regeneration station Acid consumption;
2、采用高压预漂洗技术，可以最大程度的去除带材表面的高浓度酸液，不仅能回用更多的酸液，还能减少后续漂洗段新水的消耗；2. The high-pressure pre-rinsing technology can remove the high-concentration acid solution on the surface of the strip to the greatest extent, not only can reuse more acid solution, but also reduce the consumption of new water in the subsequent rinsing section;
3、利用酸水物料衡算，动态调整往酸罐内补充的再生酸的流量和浓度，可以保证酸罐在持续收集预漂洗水的情况下浓度能够维持平稳；3. Using acid water material balance, dynamically adjust the flow rate and concentration of regenerated acid replenished into the acid tank, so as to ensure that the acid tank can maintain a stable concentration under the condition of continuous collection of pre-rinsing water;
4、低浓度漂洗废水先排至酸雾净化塔进行二次利用，最终产生的含酸废水直接排往废水处理站，既降低了酸雾净化塔的新水耗量，又避免了漂洗废水从酸再生站中转，从而降低了能耗。4. Low-concentration rinsing wastewater is first discharged to the acid mist purification tower for secondary use, and the final acid-containing wastewater is directly discharged to the wastewater treatment station, which not only reduces the fresh water consumption of the acid mist purification tower, but also avoids the rinsing wastewater from The acid regeneration station transfers, thereby reducing energy consumption.
尽管结合优选实施方案具体展示和介绍了本发明，但所属领域的技术人员应该明白，在不脱离所附权利要求书所限定的本发明的精神和范围内，在形式上和细节上可以对本发明做出各种变化，均为本发明的保护范围。Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Making various changes is within the protection scope of the present invention.

Claims (6)

  1. 一种降低冷轧酸液消耗的工艺，其用于减低带材酸洗后漂洗阶段的酸液消耗，其特征在于，包括以下步骤：A process for reducing the consumption of acid solution in cold rolling, which is used to reduce the consumption of acid solution in the rinsing stage after strip pickling, is characterized in that it comprises the following steps:
    S1、连续运行的带材在末段酸槽中酸洗结束后，在末段酸槽内先经过挤干辊挤干，再经预漂洗喷管进行预清洗，被挤干辊挤落的酸液、挤干辊高速转动甩出的酸液以及被预漂洗喷管从带材表面冲刷下来的酸液都落入末段酸槽中，且以重力流的方式回流进至酸罐中，同酸罐内的酸液混合后被酸泵抽出重新注入末段酸槽中对带材进行酸洗；S1. After the continuously running strip is pickled in the final acid tank, it is first squeezed dry by the wringer roller in the last acid tank, and then pre-cleaned by the pre-rinsing nozzle. The acid squeezed by the wringer roller The liquid, the acid liquid thrown out by the high-speed rotation of the squeezing roller and the acid liquid washed off the surface of the strip by the pre-rinsing nozzle all fall into the final acid tank, and flow back into the acid tank by gravity flow, and at the same time After the acid solution in the acid tank is mixed, it is pumped out by the acid pump and re-injected into the final acid tank to pickle the strip;
    S2、带材从末段酸槽输出后进入至多级漂洗槽内漂洗，带材依序进入第一级至最后一级漂洗槽，在第一级漂洗槽内经第一级漂洗喷管对带材表面进行漂洗，漂洗水落入第一级漂洗槽后，经第一级漂洗循环泵抽出并加压后，重新通过第一级漂洗喷管对带材表面进行漂洗，直到带材出最后一级漂洗槽；第一级漂洗槽内的漂洗水最终通过溢流管路持续流入酸雾净化塔中。S2. After the strip is output from the final acid tank, it enters the multi-stage rinsing tank for rinsing. The strip enters the first-level to the last-level rinsing tank in sequence. After the rinsing water falls into the first-stage rinsing tank, it is pumped out by the first-stage rinsing circulation pump and pressurized, and then rinses the surface of the strip through the first-stage rinsing nozzle again until the strip comes out of the last stage. Level rinsing tank; the rinsing water in the first level rinsing tank finally flows into the acid mist purification tower continuously through the overflow pipeline.
  2. 根据权利要求1所述的工艺，其特征在于：所述多级漂洗槽的漂洗水以梯流的方式由后段往前段方向流动。The process according to claim 1, characterized in that: the rinsing water in the multi-stage rinsing tank flows from the rear section to the front section in a cascade flow manner.
  3. 根据权利要求1所述的工艺，其特征在于：在酸雾净化塔内循环吸收酸雾后产生的含酸废水通过废水泵周期性的排往废水处理站进行处理。The process according to claim 1, characterized in that: the acid-containing waste water generated after the acid mist is circulated and absorbed in the acid mist purification tower is periodically discharged to the waste water treatment station for treatment through the waste water pump.
  4. 根据权利要求1所述的工艺，其特征在于：利用酸水物料衡算动态调整往酸罐内补充的再生酸的流量和浓度。The process according to claim 1, characterized in that the flow rate and concentration of regenerated acid supplemented into the acid tank are dynamically adjusted by using acid water material balance.
  5. 一种降低冷轧酸液消耗的设备，包括沿带材行进方向依序设置的多段酸洗槽和多段漂洗槽，其特征在于：所述多段酸洗槽的末段酸槽内设置有挤干辊以及位于挤干辊后段的预漂洗喷管，预漂洗喷管上设置有对带材正反两面冲洗的喷头，预漂洗喷管与高压泵相连，所述末段酸槽与酸罐通过管路相连接，所述酸 罐通过酸泵将酸洗液泵入至末段酸槽内；所述多级漂洗槽的第一级漂洗槽内设置有第一级漂洗喷管，第一级漂洗喷管上设置有对带材正反两面进行一级漂洗的喷头，第一级漂洗槽内的漂洗液通过第一级漂洗循环泵与第一级漂洗喷管相连接，所述第一级漂洗槽还与酸雾净化塔相连接，所述酸雾净化塔与废水处理站相连接。A device for reducing acid consumption in cold rolling, comprising multi-stage pickling tanks and multi-stage rinsing tanks sequentially arranged along the strip traveling direction, characterized in that: the last acid tank of the multi-stage pickling tank is provided with a squeeze dry roller and the pre-rinsing nozzle located at the rear of the squeeze roller. The pre-rinsing nozzle is equipped with nozzles for washing both sides of the strip. The pre-rinsing nozzle is connected to a high-pressure pump. The acid tank in the final stage passes through the acid tank. The pipelines are connected, and the acid tank pumps the pickling liquid into the final acid tank through the acid pump; the first-stage rinse tank of the multi-stage rinse tank is provided with a first-stage rinse nozzle, and the first-stage The rinsing nozzle is provided with a spray head for one-stage rinsing on the front and back of the strip, and the rinsing liquid in the first-stage rinsing tank is connected to the first-stage rinsing nozzle through the first-stage rinsing circulation pump. The rinsing tank is also connected with the acid mist purification tower, and the acid mist purification tower is connected with the waste water treatment station.
  6. 根据权利要求5所述的设备，其特征在于：所述第一级漂洗槽设置有溢流管路，所述第一级漂洗槽内的漂洗水通过溢流管路流入至所述酸雾净化塔中。The device according to claim 5, characterized in that: the first-stage rinsing tank is provided with an overflow pipeline, and the rinsing water in the first-level rinsing tank flows into the acid mist purification system through the overflow pipeline. tower.
PCT/CN2022/112394 2021-09-24 2022-08-15 Process and device for reducing consumption of cold-rolling acid WO2023045618A1 (en)

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CN114835170B (en) * 2022-06-06 2023-11-28 湖南华菱涟钢特种新材料有限公司 Production process of low-calcium-content ferric oxide powder

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CN205275709U (en) * 2015-12-18 2016-06-01 中冶南方工程技术有限公司 Stainless steel pickling nitration mixture descaling bath
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