CN109987642B - Process system and process method for producing ferrous chloride - Google Patents
Process system and process method for producing ferrous chloride Download PDFInfo
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- CN109987642B CN109987642B CN201910213398.XA CN201910213398A CN109987642B CN 109987642 B CN109987642 B CN 109987642B CN 201910213398 A CN201910213398 A CN 201910213398A CN 109987642 B CN109987642 B CN 109987642B
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Abstract
The invention belongs to the technical field of waste acid treatment, and particularly relates to a process system and a process method for producing ferrous chloride. The process system for producing the ferrous chloride comprises a rinsing water tank, a waste acid tank and a pre-desilication sedimentation tank, wherein the rinsing water tank is provided with a rinsing water pipeline and is respectively connected with a roasting furnace, an absorption tower and a washing tower through the rinsing water pipeline; the roasting furnace generates furnace gas, a furnace gas pipeline is arranged on the roasting furnace, the furnace gas is transmitted in the furnace gas pipeline, and the roasting furnace is sequentially connected with a Venturi, an absorption tower and a washing tower according to the transmission direction of the furnace gas; the Venturi is respectively connected with the waste acid tank and the pre-desilication sedimentation tank, and the pre-desilication sedimentation tank is connected with the filter press; the process system utilizes the resources of the production line to produce the ferrous chloride, has simple process, saves energy consumption and prevents environmental pollution.
Description
Technical Field
The invention belongs to the technical field of waste acid treatment, and particularly relates to a process system and a process method for producing ferrous chloride.
Background
Iron oxide is generated on the surface of steel in the rolling process, the steel surface must be pickled for improving the surface quality, the conventional pickling solution is hydrochloric acid pickling solution, a large amount of pickling waste liquid, namely waste acid, is generated after pickling, the waste acid is directly discharged, the pollution is serious, and the waste acid is usually discharged after treatment. The treatment of waste acid is carried out by two methods, namely an acid-base neutralization method and a hydrochloric acid regeneration method; the acid-base neutralization method needs additional addition of raw materials such as lime and the like, and has high energy consumption. The hydrochloric acid regeneration method can recycle the obtained regenerated acid. The regeneration method of hydrochloric acid, which is commonly used at present, is usually a spray roasting method, and regenerated acid and iron oxide powder are obtained.
Under the condition that the process system of the regenerated acid in the factory is perfect, no acid regeneration station is built in other steel plate pickling plants, in order to solve the environmental protection problem, waste acid generated by an external factory enters the acid regeneration station of the factory to regenerate the waste acid, meanwhile, the acid regeneration of the factory regenerates the waste acid generated by the factory, and the generated regenerated acid is surplus on the premise of meeting the pickling production of the factory.
How to make full use of the surplus waste acid and reduce environmental pollution is a problem which is urgently needed to be solved at present.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a process system and a process method for producing ferrous chloride, the process system is simple, waste acid resources are fully utilized, energy consumption is saved, and environmental pollution is prevented.
In order to achieve the purpose, the technical scheme adopted by the invention on one hand is as follows: a process system for producing ferrous chloride comprises a rinsing water tank, a waste acid tank and a pre-desilication sedimentation tank, wherein the rinsing water tank is provided with a rinsing water pipeline and is respectively connected with a roasting furnace, an absorption tower and a washing tower through the rinsing water pipeline;
the roasting furnace generates furnace gas, a furnace gas pipeline is arranged on the roasting furnace, the furnace gas is transmitted in the furnace gas pipeline, and the roasting furnace is sequentially connected with a Venturi, an absorption tower and a washing tower according to the transmission direction of the furnace gas;
the venturi is respectively connected with the waste acid tank and the pre-desiliconization sedimentation tank, and the pre-desiliconization sedimentation tank is connected with the filter press.
Preferably, the venturi is connected with one end of a waste acid circulating pipeline, and the other end of the waste acid circulating pipeline is connected with the pre-desilication sedimentation tank.
Preferably, a dust remover is arranged between the roasting furnace and the venturi according to the conveying direction of the furnace gas.
Preferably, the dust remover is a double-cyclone dust remover; the bottom of the double-cyclone dust collector is connected with the roasting furnace.
Preferably, a fan is arranged between the absorption tower and the washing tower according to the conveying direction of the furnace gas.
Preferably, the wash column comprises a first stage wash section which is a rinse water wash section and a second stage wash section which is a desalted water wash section.
Preferably, the furnace gas temperature at the furnace top of the roasting furnace is 380-420 ℃, and the pressure at the furnace top of the roasting furnace is-0.45-0.5 KPa.
The invention also provides a process method for producing ferrous chloride, which adopts the process system for producing ferrous chloride and comprises the following steps:
storing rinsing water and waste acid respectively, and roasting a part of rinsing water into furnace gas;
the furnace gas exchanges heat with the waste acid, and the waste acid is concentrated to obtain heat-exchanged waste acid and heat-exchanged furnace gas;
cooling and crystallizing the waste acid after heat exchange, and precipitating after crystallization to obtain ferrous chloride and second waste acid;
carrying out filter pressing on the ferrous chloride and the second waste acid to obtain a ferrous chloride crystal and a third waste acid;
performing heat-mass exchange on the other part of the rinsing water and the furnace gas subjected to heat exchange to obtain concentrated rinsing water and the furnace gas subjected to heat-mass exchange;
and the furnace gas after the heat and mass exchange is discharged after being washed.
Preferably, the step of obtaining ferrous chloride crystals and third waste acid after the ferrous chloride and the second waste acid are subjected to pressure filtration further comprises,
and the third waste acid exchanges heat with the furnace gas.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, heat exchange is carried out between the furnace gas and the waste acid in the Venturi, the waste acid is concentrated by the heat contained in the furnace gas, the concentrated waste acid, namely the waste acid after heat exchange is conveyed to the pre-desilication sedimentation tank for cooling crystallization and sedimentation after crystallization, and ferrous chloride crystals can be produced by utilizing the rinsing water and the waste acid of the pickling line, so that other raw materials are not required to be supplemented, the energy consumption is saved, and the environmental pollution caused by the discharge of the waste acid is prevented. The waste acid after solid-liquid separation of the filter press, namely the third waste acid, flows back to the Venturi, and the third waste acid and the furnace gas continuously carry out heat exchange; the waste acid forms a conveying circulation in the Venturi, the pre-desilication sedimentation tank and the filter press, the waste acid resource is fully utilized,
drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a process system for producing ferrous chloride according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a process for producing ferrous chloride according to an embodiment of the present invention.
Wherein, each reference mark in the figure is:
1-a rinsing water tank, 2-a waste acid tank, 3-a roasting furnace, 4-an absorption tower, 5-a washing tower, 6-a venturi, 7-a pre-desilication sedimentation tank, 8-a filter press, 10-a third waste acid pre-concentration pump, 11-a dust remover, 12-a fan, 13-a first-stage washing section, 14-a second-stage washing section, 100-a rinsing water pipeline, 200-a furnace gas pipeline, 300-a waste acid circulating pipeline, 400-a desalted water circulating pipeline and 500-a rinsing water circulating washing pipeline.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length" - "width" - "up" - "down" - "front" - "back" - "left" - "right" - "vertical" - "horizontal" - "top" - "bottom" - "inside" - "outside" etc. indicate orientations or positional relationships based on those shown in the drawings, which are merely for convenience of describing and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation-be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" - "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
As shown in fig. 1, a process system for producing ferrous chloride according to an aspect of the embodiment of the present invention includes a rinse water tank 1, a waste acid tank 2, and a pre-desiliconization sedimentation tank 7, wherein a rinse water pipeline 100 is disposed on the rinse water tank 1, and the rinse water tank 1 is connected to a roasting furnace 3, an absorption tower 4, and a washing tower 5 through the rinse water pipeline 100;
the roasting furnace 3 generates furnace gas, a furnace gas pipeline 200 is arranged on the roasting furnace 3, the furnace gas is transmitted in the furnace gas pipeline 200, and the roasting furnace 3 is sequentially connected with a venturi 6, an absorption tower 4 and a washing tower 5 according to the transmission direction of the furnace gas;
the venturi 6 is respectively connected with the waste acid tank 2 and the pre-desiliconization sedimentation tank 7, and the pre-desiliconization sedimentation tank 7 is connected with the filter press 8.
The waste acid, which usually contains chloride ions and ferrous ions, contains water and ferrous chloride as main components, and is discharged directly, pollutes the environment and causes waste.
The rinsing water usually contains free acid such as hydrochloric acid and iron ions, and the rinsing water is the water after the surface of the steel strip is cleaned because the surface of the steel strip after being cleaned by the acid has a certain amount of residual acid liquor.
The working process of the embodiment of the invention is that rinse water from a pickling line is stored in a rinse water tank 1, the rinse water is conveyed by three routes, wherein one part of the rinse water is conveyed to a roasting furnace 3, the other part of the rinse water is conveyed to an absorption tower 4, and the other part of the rinse water is conveyed to a washing tower 5; the rinsing water concentrated by the absorption tower 4 flows back to the rinsing water tank 1, and the rinsing water is recycled;
roasting the rinsing water by the roasting furnace 3 to generate high-temperature furnace gas, wherein the furnace gas contains HCl gas fog and heat, and the furnace gas is conveyed into the Venturi 6;
waste acid from the pickling line of the factory or waste acid from an external factory is stored in the waste acid tank 2, and the waste acid is conveyed into the venturi 6;
in the Venturi 6, the waste acid and the furnace gas exchange heat, the water in the waste acid is evaporated, the waste acid is concentrated, and the waste acid after heat exchange and the furnace gas after heat exchange are obtained;
conveying the waste acid after heat exchange to a pre-desilication sedimentation tank 7 for cooling crystallization, and precipitating after crystallization to obtain ferrous chloride and second waste acid;
conveying the ferrous chloride and the second waste acid to a filter press 8, carrying out solid-liquid separation on the ferrous chloride and the second waste acid by the filter press 8, and separating the second waste acid from the ferrous chloride to obtain a third waste acid and a ferrous chloride crystal;
the furnace gas after heat exchange enters an absorption tower 4, the furnace gas after heat exchange and rinsing water are subjected to heat-mass exchange in the absorption tower 4, hydrogen chloride gas mist contained in the furnace gas is condensed and enters the rinsing water, partial water in the rinsing water is evaporated to obtain concentrated rinsing water and the furnace gas after heat-mass exchange, the concentration of free acid in the concentrated rinsing water is increased, and the concentrated rinsing water is conveyed to a rinsing water tank 1;
and the furnace gas after the heat and mass exchange enters a washing tower 5 for washing treatment, and the furnace gas after the washing treatment is discharged.
According to the embodiment of the invention, the heat exchange is carried out between the furnace gas and the waste acid in the Venturi 6, the waste acid is concentrated by the heat contained in the furnace gas, the concentrated waste acid, namely the waste acid after the heat exchange is conveyed to the pre-desilication sedimentation tank 7 for cooling crystallization and sedimentation after crystallization, and the ferrous chloride crystal can be produced by utilizing the rinsing water and the waste acid of the pickling line, so that other raw materials are not required to be supplemented, the energy consumption is saved, and the environmental pollution caused by the discharge of the waste acid is prevented.
The process for producing the ferrous chloride crystal in the embodiment of the invention can be carried out discontinuously, the process for producing the ferrous chloride crystal and the process for producing the regenerated acid are combined for production, the process for producing the regenerated acid is a production process known in the prior art, and for example, the following processes can be adopted: waste acid is roasted by a roasting furnace to generate waste acid furnace gas, the waste acid reacts with oxygen and water in the roasting furnace to generate ferric oxide powder and hydrogen chloride aerial fog, and the generated ferric oxide powder falls to the conical bottom of the roasting furnace. The hydrogen chloride HCl aerial fog in the waste acid furnace gas is combined with rinsing water to generate regenerated acid.
Preferably, the venturi 6 is connected with one end of a waste acid circulating pipeline 300, and the other end of the waste acid circulating pipeline 300 is connected with the pre-desiliconization sedimentation tank 7.
The waste acid after solid-liquid separation by the filter press 8, namely the third waste acid, flows back to the Venturi 6, and the third waste acid and the furnace gas continuously carry out heat exchange; the waste acid forms a conveying circulation in the Venturi 6, the pre-desilication sedimentation tank 7 and the filter press 8, and the waste acid resource is fully utilized.
Specifically, a plurality of waste acid nozzles can be arranged at the top of the venturi 6, and the third waste acid is sprayed through the waste acid nozzles and exchanges heat with the furnace gas conveyed to the top of the venturi 6 by the roasting furnace; through the arrangement of the waste acid spray nozzle, the contact area of the third waste acid and the furnace gas is larger, heat exchange can be fully carried out, and the heat exchange efficiency is improved.
Due to the cyclic concentration of the third waste acid and the cooling crystallization in the pre-desilication sedimentation tank 7; at this time, the waste acid in the waste acid tank 2 can be conveyed into the venturi 6 for supplementing the waste acid in the venturi 6, and the circulation concentration of the third waste acid is ensured. Wherein, the waste acid can be conveyed to the middle position of the Venturi 6 and can be pressurized and conveyed by a pump.
Further preferably, a third waste acid pre-concentration pump 10 is arranged on the waste acid circulation pipeline 300, and the third waste acid pre-concentration pump 10 pumps the third waste acid to achieve the purpose of circulation.
Preferably, a dust separator 11 is arranged between the roasting furnace 3 and the venturi 6 according to the direction of the furnace gas transmission.
The furnace gas generated by roasting the roasting furnace 3 may contain impurity particles, wherein the impurity particles may be slag in the roasting furnace 3, the dust remover 11 is used for removing the impurity particles, the impurity particles are settled in the dust remover 11, so that the blockage of the furnace gas pipeline 200 and conveying equipment in the conveying process of the furnace gas is prevented, meanwhile, the impurity carried in the furnace gas is prevented from entering the venturi 6, and the purity of the final product ferrous chloride crystal is further improved.
Preferably, the dust remover 11 is a double-cyclone dust remover; the bottom of the double-cyclone dust collector is connected with the roasting furnace 3.
The furnace gas generated by roasting the roasting furnace 3 may contain iron oxide powder, the double-cyclone dust collector enhances the dust removal effect, the bottom of the double-cyclone dust collector is connected with the roasting furnace 3, and the iron oxide powder separated from the double-cyclone dust collector is conveyed into the roasting furnace 3, so that the blockage of the furnace gas pipeline 200 and conveying equipment in the conveying process of the furnace gas is prevented.
Preferably, a fan 12 is arranged between the absorption tower 4 and the washing tower 5 according to the conveying direction of the furnace gas.
The fan 12 ensures the negative pressure state of the furnace gas pipeline 200 and prevents the furnace gas from escaping.
Preferably, the scrubber tower 5 comprises a first stage scrubber section 13 and a second stage scrubber section 14, the first stage scrubber section 13 being a rinse water scrubber section and the second stage scrubber section 14 being a desalted water scrubber section.
Through two-stage washing, the furnace gas is washed, and the pollution caused by the discharge of the furnace gas to the atmospheric environment is prevented.
It is further preferred that a rinse water circulation wash conduit 500 is provided in the first stage wash stage 13 for absorbing residual hydrogen chloride aerosol and heat from the furnace gas in the wash column 5, while rinse water is also partially concentrated during this process.
The rinse water concentrated in the washing tower 5 is refluxed to the rinse water tank 1.
A desalted water circulating pipeline 400 is arranged on the second-stage washing section 14 and used for circulating desalted water in the washing tower 5, the desalted water is washed to remove hydrogen chloride aerial fog in the furnace gas, heat in the furnace gas is removed, the furnace gas is ensured to be finally discharged up to the standard, and the desalted water overflows into a rinsing water washing section after absorbing the hydrogen chloride aerial fog; a particular overflow location may be where the second stage of scrubber 5 collects water.
Preferably, the furnace gas temperature at the furnace top of the roasting furnace 3 is 380-420 ℃, and the pressure at the furnace top of the roasting furnace 3 is-0.45-0.5 KPa.
The temperature of furnace gas at the top of the furnace is 380-420 ℃, so that rinsing water is fully roasted, and waste acid can be fully concentrated when heat exchange is carried out between the furnace gas generated by roasting and the waste acid. The negative pressure at the furnace top is kept between-0.45 KPa and-0.5 KPa, so as to ensure the negative pressure state in the furnace gas pipeline. The furnace gas is conveyed into the absorption tower 5, the temperature of the furnace gas is less than 99 ℃, and in the absorption tower 5, the heat and mass exchange between the furnace gas and the rinse water is ensured, and the rinse water is concentrated.
The concentration of the free acid in the concentrated rinsing water is increased, and the hydrogen chloride (HCl) gas in the furnace gas is combined with the rinsing water in the production process of the regenerated acid, so that the production efficiency of the regenerated acid is improved.
Preferably, the heat-exchanged waste acid generated in the venturi 6 can be introduced into the pre-desilication settling tank 7 by gravity flow. The waste acid after heat exchange is concentrated waste acid, the fluidity of the waste acid is poor, the intermediate resistance can be reduced by self-flowing introduction, and the energy consumption is saved.
In the above embodiments, the waste acid from the factory pickling line or the waste acid from the outside factory may be desiliconized and then transported to the venturi 6.
After the waste acid is subjected to desiliconization, on one hand, because the waste acid which is not subjected to desiliconization is easy to form silica gel on the inner wall of the conveying pipeline, the formation of the silica gel can reduce the conveying inner diameter of the pipeline, influence the operation of the system, and the desiliconization can ensure the normal operation of the system; on the other hand, the desiliconization treatment can remove part of impurities in the waste acid, thereby improving the purity of the final product ferrous chloride crystal; on the other hand, the pH value of the waste acid can be adjusted through desiliconization, the acid-washed waste acid usually contains free acid, and the concentration of the free acid can be reduced through adding waste steel for treatment, so that the concentration of ferrous ions is improved, and finally the yield of ferrous chloride crystals of a final product is improved.
In the above embodiments, the rinse water is fed into the roasting furnace 3, wherein the roasting furnace 3 includes a nozzle located at the top of the roasting furnace 3, the rinse water may be fed into the nozzle at the top of the roasting furnace 3 by a pressure pump, fed into the nozzle of the roasting furnace 3, and sprayed into the roasting furnace 3, so that the rinse water has a uniform heating area.
Waste acid is conveyed from the waste acid tank 2 to the venturi 6, and the specific conveying mode can be conveyed through a pump; a filter can be arranged between the waste acid tank 2 and the pump and is used for filtering impurity particles in the waste acid;
ferrous chloride and the second waste acid are conveyed into a filter press 8 from the pre-desilication sedimentation tank 7, and the ferrous chloride and the second waste acid can be introduced into the filter press 8 for filter pressing through a diaphragm pump in a specific conveying mode.
Ferrous chloride crystals and the third waste acid are obtained from the ferrous chloride and the second waste acid which are subjected to solid-liquid separation treatment by the filter press 8, and the third waste acid can flow back to the top of the pre-desilication sedimentation tank 7 due to the self pressure of the filter press 8.
And the third waste acid in the pre-desiliconization sedimentation tank 7 continuously flows back to the Venturi 6 to exchange heat with the furnace gas.
As shown in fig. 2, another aspect of the embodiment of the present invention provides a process for producing ferrous chloride, which includes the following steps:
adopting the process system for producing the ferrous chloride in the embodiments;
s01, storing rinsing water and waste acid respectively, and roasting a part of rinsing water into furnace gas;
s02, carrying out heat exchange between the furnace gas and the waste acid, and concentrating the waste acid to obtain heat-exchanged waste acid and heat-exchanged furnace gas;
s03, cooling and crystallizing the waste acid after heat exchange, and precipitating after crystallization to obtain ferrous chloride and second waste acid;
s04, carrying out filter pressing on the ferrous chloride and the second waste acid to obtain a ferrous chloride crystal and a third waste acid;
s05, performing heat-mass exchange on the other part of rinsing water and the heat-exchanged furnace gas to obtain concentrated rinsing water and heat-mass exchanged furnace gas;
s06, washing the furnace gas after the heat and mass exchange, and discharging.
The ferrous chloride crystal is produced by carrying out heat-mass exchange on rinsing water and waste acid, the production process is simple, only raw materials of a pickling line are selected, no additional raw materials are needed, and resources are saved.
Wherein, after the step S04, further comprising,
s07, and exchanging heat between the third waste acid and the furnace gas.
And (4) refluxing the third waste acid, mixing the third waste acid with the waste acid, and exchanging heat with the furnace gas. The waste acid resources are fully utilized, and the energy consumption is saved.
The present invention is not limited to the above preferred embodiments, and any modification, equivalent replacement and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A process system for producing ferrous chloride is characterized by comprising a rinsing water tank, a waste acid tank, a pre-desiliconization sedimentation tank and a waste acid circulating pipeline,
the rinsing water tank is connected with the roasting furnace, the absorption tower and the washing tower through the rinsing water pipeline respectively, and is used for storing rinsing water which is conveyed to the roasting furnace, the absorption tower and the washing tower through the rinsing water pipeline respectively; the rinsing water contains hydrochloric acid and iron ions;
the roasting furnace generates furnace gas, a furnace gas pipeline is arranged on the roasting furnace, the furnace gas is transmitted in the furnace gas pipeline, the roasting furnace is sequentially connected with a Venturi, an absorption tower and a washing tower according to the transmission direction of the furnace gas, wherein the furnace gas is obtained by roasting the rinsing water in the roasting furnace;
the venturi is respectively connected with a waste acid tank and a pre-desiliconization sedimentation tank, the pre-desiliconization sedimentation tank is connected with a filter press, the waste acid tank is used for storing waste acid, the waste acid can be conveyed to the venturi, the furnace gas and the waste acid exchange heat in the venturi to obtain waste acid after heat exchange, the waste acid after heat exchange is sequentially conveyed to the pre-desiliconization sedimentation tank and the filter press, the pre-desiliconization sedimentation tank is used for cooling and crystallizing the waste acid after heat exchange into ferrous chloride, and the filter press performs solid-liquid separation on the waste acid after heat exchange to obtain third waste acid; the main components of the waste acid are water and ferrous chloride;
the venturi is connected the one end of spent acid circulating line, the other end of spent acid circulating line with the desilication sedimentation tank is connected in advance, spent acid circulating line is used for with the third waste acid reflux extremely the venturi.
2. The process system for producing ferrous chloride as claimed in claim 1, wherein a dust collector is disposed between said roasting furnace and said venturi according to the direction of the furnace gas transport.
3. The process system for producing ferrous chloride as claimed in claim 2, wherein said dust collector is a double cyclone dust collector; the bottom of the double-cyclone dust collector is connected with the roasting furnace.
4. The process system for producing ferrous chloride as claimed in claim 1, wherein a fan is provided between said absorption tower and said scrubber tower according to the direction of furnace gas transport.
5. The process system for producing ferrous chloride as recited in claim 1 wherein the scrubber tower comprises a first stage scrubbing section and a second stage scrubbing section, the first stage scrubbing section being a rinse water scrubbing section and the second stage scrubbing section being a desalted water scrubbing section.
6. The process system for producing ferrous chloride according to claim 1, wherein the temperature of the furnace gas at the furnace top of the roasting furnace is 380-420 ℃, and the pressure at the furnace top of the roasting furnace is-0.45-0.5 KPa.
7. A process method for producing ferrous chloride, which adopts the process system for producing ferrous chloride as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps:
storing rinsing water and waste acid respectively, and roasting a part of rinsing water into furnace gas;
the furnace gas exchanges heat with the waste acid, and the waste acid is concentrated to obtain heat-exchanged waste acid and heat-exchanged furnace gas;
cooling and crystallizing the waste acid after heat exchange, and precipitating after crystallization to obtain ferrous chloride and second waste acid;
carrying out filter pressing on the ferrous chloride and the second waste acid to obtain a ferrous chloride crystal and a third waste acid;
the third waste acid exchanges heat with the furnace gas;
performing heat-mass exchange on the other part of the rinsing water and the furnace gas subjected to heat exchange to obtain concentrated rinsing water and the furnace gas subjected to heat-mass exchange;
and the furnace gas after the heat and mass exchange is discharged after being washed.
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| CN1851320A (en) * | 2006-04-28 | 2006-10-25 | 中冶南方工程技术有限公司 | Hydrochloride waste regenerating process for spray roasting |
| CN201010528Y (en) * | 2007-03-06 | 2008-01-23 | 天津市聚鑫源水处理技术开发有限公司 | Processing system for recycling ferrous chloride crystal and hydrochloric acid from hydrochloric acid waste liquid |
| CN101343123A (en) * | 2007-07-11 | 2009-01-14 | 郝国臣 | Technique for recycling acid waste liquid of strip steel |
| CN101214924A (en) * | 2008-01-15 | 2008-07-09 | 成都阿斯特克国龙环保工程有限公司 | Regenerating system and technique for three-tower waste aid |
| CN205874546U (en) * | 2016-07-28 | 2017-01-11 | 鞍钢集团工程技术有限公司 | Device that increases acid recovery rate is retrieved in cold rolling sour regeneration absorption tower circulation |
| CN106830488A (en) * | 2017-03-23 | 2017-06-13 | 彭春来 | A kind of steel galvanization spent acid auto purification environment-friendly disposal system and method |
| CN207079005U (en) * | 2017-08-01 | 2018-03-09 | 武汉江汉化工设计有限公司 | A kind of wire rope factory abraum salt acid treatment device |
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