CN109987642A - 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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- CN109987642A CN109987642A CN201910213398.XA CN201910213398A CN109987642A CN 109987642 A CN109987642 A CN 109987642A CN 201910213398 A CN201910213398 A CN 201910213398A CN 109987642 A CN109987642 A CN 109987642A
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- furnace gas
- spent acid
- frerrous chloride
- roaster
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000008569 process Effects 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229960002089 ferrous chloride Drugs 0.000 title abstract 4
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 title abstract 4
- 239000002253 acid Substances 0.000 claims abstract description 157
- 238000005406 washing Methods 0.000 claims abstract description 31
- 238000004062 sedimentation Methods 0.000 claims abstract description 24
- 238000010521 absorption reaction Methods 0.000 claims abstract description 19
- 239000002699 waste material Substances 0.000 claims abstract description 18
- 239000008237 rinsing water Substances 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 59
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 51
- 238000005201 scrubbing Methods 0.000 claims description 19
- 239000013078 crystal Substances 0.000 claims description 14
- 238000002425 crystallisation Methods 0.000 claims description 13
- 239000000428 dust Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- 230000008025 crystallization Effects 0.000 claims description 6
- 239000002244 precipitate Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 4
- 238000010612 desalination reaction Methods 0.000 claims description 3
- 238000005660 chlorination reaction Methods 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 238000010306 acid treatment Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 77
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 16
- 238000005554 pickling Methods 0.000 description 12
- IXCSERBJSXMMFS-UHFFFAOYSA-N hcl hcl Chemical compound Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 8
- 239000000443 aerosol Substances 0.000 description 7
- 239000012535 impurity Substances 0.000 description 7
- 230000008929 regeneration Effects 0.000 description 7
- 238000011069 regeneration method Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 101100298225 Caenorhabditis elegans pot-2 gene Proteins 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 229940067573 brown iron oxide Drugs 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000004094 preconcentration Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- -1 direct emission Chemical compound 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 229910001448 ferrous ion Inorganic materials 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 208000021302 gastroesophageal reflux disease Diseases 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/10—Halides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Treating Waste Gases (AREA)
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 waste acid treatment technical fields, and in particular to a kind of process system for producing frerrous chloride and technique side
Method.
Background technique
Surface can generate iron oxide in the steel operation of rolling, in order to improve steel surface quality, it is necessary to carry out pickling, at present
Common pickling solution is hydrochloric acid pickler, after pickling, can generate a large amount of pickle liquor i.e. spent acid, spent acid direct emission, pollution
Seriously, it usually needs discharged after processing.Processing to spent acid, at present frequently with two methods, first is that acid-base neutralization method, two
It is regeneration of hydrochloric acid method；Acid-base neutralization method needs additional adding raw materials such as lime etc., and energy consumption is higher.Regeneration of hydrochloric acid method can incite somebody to action
To regenerated acid reused.Currently used regeneration of hydrochloric acid method, usually spray roasting mode, obtains regenerated acid and oxygen
Change iron powder.
In the case where our factory's regenerated acid process system improves, other places steel plate acid-washing factory does not build acid regeneration station, to solve
Its environmental issue, the spent acid that other factory generates will enter our factory's acid regeneration station and carry out acid regeneration, while the acid regeneration of our factory will
The spent acid that our factory generates is regenerated, and the regenerated acid of generation will have more than needed under the premise of meeting our factory's pickling production.
How spent acid more than needed to be made full use of, reduces environmental pollution, be current urgent problem.
Summary of the invention
In order to solve the above technical problems, the purpose of the present invention is to provide a kind of process system for producing frerrous chloride and works
Process, process system is simple, makes full use of waste acid resource, and energy-conservation energy consumption prevents pollution environment.
To achieve the above object, one aspect of the present invention the technical solution adopted is that: a kind of technique system producing frerrous chloride
System, including water tank, waste acid pot and pre-desiliconizing sedimentation basin are rinsed, setting rinsing waterpipe, the rinse water on the rinsing water tank
Case is separately connected roaster, absorption tower and scrubbing tower by the rinsing waterpipe；
The roaster generates furnace gas, furnace gas pipeline is arranged on the roaster, the furnace gas is in the furnace gas pipeline
Transmission, the roaster are sequentially connected venturi, absorption tower and scrubbing tower according to the direction that furnace gas transmits；
The venturi is connect with waste acid pot, pre-desiliconizing sedimentation basin respectively, and pre-desiliconizing sedimentation basin connects filter press.
Preferably, the venturi is connected with one end of spent acid circulating line, the other end of spent acid circulating line with it is described
The connection of pre-desiliconizing sedimentation basin.
Preferably, the direction transmitted according to furnace gas, is arranged deduster between the roaster and the venturi.
Preferably, the deduster is double-cyclone dust collector；The bottom of the double-cyclone dust collector is connect with roaster.
Preferably, the direction transmitted according to furnace gas, is arranged blower between the absorption tower and the scrubbing tower.
Preferably, the scrubbing tower includes first order washing section and second level washing section, and first order washing section is rinse water
Washing section, second level washing section are desalted water washing section.
Preferably, the furnace gas temperature at the furnace roof of the roaster is 380~420 DEG C, at the furnace roof of the roaster
Pressure is -0.45~-0.5KPa.
Another aspect of the present invention provides a kind of process for producing frerrous chloride, using production chlorination described above
Ferrous process system, comprising the following steps:
Rinse water and spent acid are stored respectively, and the rinse water of a part is roasted to furnace gas；
The furnace gas and the spent acid carry out heat exchange, and the spent acid is concentrated, spent acid and Re Jiao after obtaining heat exchange
Furnace gas after changing；
Spent acid after the heat exchange precipitates after crystallization through crystallisation by cooling, obtains frerrous chloride and the second spent acid；
The frerrous chloride and the second spent acid obtain frerrous chloride crystal and third spent acid after filters pressing；
The rinse water of another part is carried out caloic with the furnace gas after the heat exchange to exchange, the rinse water after being concentrated
With the furnace gas after caloic exchange；
It is discharged after the washed processing of furnace gas after the caloic exchange.
Preferably, the frerrous chloride and the second spent acid obtain the step of frerrous chloride crystal and third spent acid after filters pressing
After rapid, further include,
The third spent acid and the furnace gas carry out heat exchange.
Compared with prior art, the invention has the following advantages:
The present invention carries out heat exchange by the furnace gas in venturi and spent acid, the heat for including in furnace gas by waste acid concentration,
The spent acid after spent acid, that is, heat exchange after concentration is delivered to crystallisation by cooling in pre-desiliconizing sedimentation basin, precipitates after crystallization, passes through utilization
The rinse water and spent acid of pickling line can produce frerrous chloride crystal, are not required to supplement other raw materials, save energy consumption, while preventing from giving up
Sour outlet causes environmental pollution.The i.e. third spent acid of spent acid after filter press is separated by solid-liquid separation is back in venturi, third spent acid
Continue heat exchange with furnace gas；Spent acid forms conveying circulation in venturi, pre-desiliconizing sedimentation basin and filter press, makes full use of
Waste acid resource,
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the process system structural schematic diagram of production frerrous chloride provided in an embodiment of the present invention；
Fig. 2 is the flow diagram of the process of production frerrous chloride provided in an embodiment of the present invention.
Wherein, each appended drawing reference in figure are as follows:
1- rinses water tank, 2- waste acid pot, 3- roaster, the absorption tower 4-, 5- scrubbing tower, 6- venturi, 7- pre-desiliconizing precipitating
Pond, 8- filter press, 10- third spent acid pre-concentration pump, 11- deduster, 12- blower, 13- first order washing section, 14- are washed the second level
Section is washed, 100- rinses waterpipe, 200- furnace gas pipeline, 300- spent acid circulating line, 400- desalination water circulating pipe, 500- rinsing
Water circulation washing pipeline.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " length "-" width "-"upper"-"lower"-" preceding "-
The orientation or positional relationship of the instructions such as " rear "-" left side "-" right side "-"vertical"-"horizontal"-"top"-"bottom" "inner"-"outside"
To be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description of the present invention and simplification of the description, rather than indicate or
It implies that signified device or element must have a particular orientation-are constructed and operated in a specific orientation, therefore should not be understood as
Limitation of the present invention.
In addition, term " first " " second " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " first "-" second " feature can express or
Person implicitly includes one or more of the features.In the description of the present invention, the meaning of " plurality " is two or two with
On, unless otherwise specifically defined.
As shown in Figure 1, on the one hand a kind of process system for producing frerrous chloride that the embodiment of the present invention provides, including rinsing
Water tank 1, waste acid pot 2 and pre-desiliconizing sedimentation basin 7, setting rinsing waterpipe 100, the rinsing water tank 1 lead on the rinsing water tank 1
It crosses the rinsing waterpipe 100 and is separately connected roaster 3, absorption tower 4 and scrubbing tower 5；
The roaster 3 generates furnace gas, furnace gas pipeline 200 is arranged on the roaster 3, the furnace gas is in the furnace gas pipe
It is transmitted in road 200, the roaster 3 is sequentially connected venturi 6, absorption tower 4 and scrubbing tower 5 according to the direction that furnace gas transmits；
The venturi 6 is connect with waste acid pot 2, pre-desiliconizing sedimentation basin 7 respectively, and pre-desiliconizing sedimentation basin 7 connects filter press 8.
Spent acid, usually contains chloride ion and ferrous ion, and main component is water and frerrous chloride, such as direct emission, spent acid
Environment is polluted, and will cause waste.
Rinse water usually contains free acid such as hydrochloric acid, iron ion, because the belt steel surface after pickling is with a certain amount of residual
Spent acid liquid, rinse water are the water after cleaning surface of strip steel.
The course of work of the embodiment of the present invention is that the rinse water from pickling line is stored in rinsing water tank 1, rinses moisture
Three routes are conveyed, wherein a part rinsing is delivered to roaster 3, another part rinse water is delivered to absorption tower 4, with
And another part rinse water is delivered in scrubbing tower 5；Rinse water after absorption tower 4 is concentrated is back in rinsing water tank 1, circulation
Utilize rinse water；
The roaster 3 roasts rinse water and generates high-temperature furnace gas, includes hydrogen chloride HCl aerosol and heat in furnace gas, by furnace
Gas is delivered in venturi 6；
The spent acid that spent acid or other factory from our factory's pickling line come, is stored in waste acid pot 2, spent acid is delivered to venturi
In 6；
In venturi 6, spent acid and furnace gas carry out heat exchange, and the moisture evaporation in spent acid, spent acid is concentrated, and obtain hot friendship
The furnace gas after spent acid and heat exchange after changing；
Spent acid after heat exchange is delivered to crystallisation by cooling in pre-desiliconizing sedimentation basin 7, precipitates after crystallization, obtain frerrous chloride and
Second spent acid；
The frerrous chloride and the second spent acid are delivered to filter press 8, filter press 8 carries out frerrous chloride and the second spent acid
It is separated by solid-liquid separation, the second spent acid is separated with frerrous chloride, obtains third spent acid and frerrous chloride crystal；
Furnace gas after heat exchange, into absorption tower 4, in absorption tower 4, furnace gas and rinse water after heat exchange carry out heat
Mass transter, the hydrogen chloride aerosol condensation for including in furnace gas enter in rinse water, and the partial moisture evaporation in rinse water is concentrated
Furnace gas after rear rinse water and caloic exchange, the concentration of free acid increases in the rinse water after concentration, by the rinsing after concentration
Water is delivered to rinsing water tank 1；
Furnace gas after the caloic exchange carries out carrying out washing treatment into scrubbing tower 5, the furnace gas after discharging carrying out washing treatment.
The embodiment of the present invention carries out heat exchange by the furnace gas in venturi 6 and spent acid, and the heat for including in furnace gas will give up
Acid concentration, the spent acid after spent acid, that is, heat exchange after concentration are delivered to crystallisation by cooling in pre-desiliconizing sedimentation basin 7, precipitate after crystallization,
Frerrous chloride crystal can be produced by rinse water using pickling line and spent acid, is not required to supplement other raw materials, saves energy consumption, together
When prevent spent acid outlet from causing environmental pollution.
The technique of production frerrous chloride crystal of the embodiment of the present invention can be interrupted production, and present invention production frerrous chloride is brilliant
The technique of technique and the regenerated acid production of body combines production, and the production technology of regenerated acid is production work commonly known in the art
Skill, such as following technique can be used: spent acid is fired furnace roasting and generates spent acid furnace gas, and spent acid is anti-with oxygen and water in roaster
Brown iron oxide and hydrogen chloride aerosol should be generated, the brown iron oxide of generation falls on the conical lower portion of roaster.Chlorine in spent acid furnace gas
Change hydrogen HCl aerosol and generates regenerated acid in conjunction with rinse water.
Preferably, the venturi 6 is connected with one end of spent acid circulating line 300, the other end of spent acid circulating line 300
It is connect with the pre-desiliconizing sedimentation basin 7.
Spent acid, that is, third spent acid after the separation of solid and liquid of filter press 8 is back in venturi 6, and third spent acid and furnace gas continue
Carry out heat exchange；Spent acid forms conveying circulation in venturi 6, pre-desiliconizing sedimentation basin 7 and filter press 8, and spent acid is made full use of to provide
Source.
Specifically, several spent acid nozzles can be set in the top of venturi 6, and third spent acid is sprayed by spent acid nozzle, with
The furnace gas that roaster is transported to 6 top of venturi carries out heat exchange；By the setting of spent acid nozzle, third spent acid is contacted with furnace gas
Area is bigger, can sufficiently carry out heat exchange, increases heat exchange efficiency.
Since the circulation of third spent acid is concentrated, and the crystallisation by cooling in pre-desiliconizing sedimentation basin 7；At this time in waste acid pot 2
Spent acid can be delivered in venturi 6, for supplementing the spent acid in venturi 6, guarantee the circulation concentration of third spent acid.Wherein,
Spent acid can be delivered to the medium position of venturi 6, and spent acid can be by pumping pressurized delivered.
It is further preferred that third spent acid pre-concentration is arranged on the spent acid circulating line 300 pumps 10, the third spent acid
10 pumping third spent acid of pre-concentration pump, achievees the purpose that circulation.
Preferably, deduster 11 is arranged in the direction transmitted according to furnace gas between the roaster 3 and the venturi 6.
In the furnace gas that the roasting of roaster 3 generates, impurity particle may be contained, wherein impurity particle can be in roaster 3
Clinker, for removing impurity particle, impurity particle settles deduster 11 in deduster 11, prevents furnace gas during conveying
The blocking of furnace gas pipeline 200 and conveying equipment is caused, while avoiding carrying impurity in furnace gas and entering in venturi 6, Jin Erti
The purity of high final products frerrous chloride crystal.
Preferably, the deduster 11 is double-cyclone dust collector；The bottom of the double-cyclone dust collector and roaster 3 connect
It connects.
It may include brown iron oxide in the furnace gas that the roasting of roaster 3 generates, the double-cyclone dust collector reinforces dust removing effects,
The bottom of double-cyclone dust collector is connect with roaster 3, and the brown iron oxide isolated in double-cyclone dust collector is delivered to roaster 3
In, prevent furnace gas from causing the blocking of furnace gas pipeline 200 and conveying equipment during transmission.
Preferably, blower 12 is arranged in the direction transmitted according to furnace gas between the absorption tower 4 and the scrubbing tower 5.
The blower 12 guarantees the negative pressure state of furnace gas pipeline 200, prevents furnace gas from escaping.
Preferably, the scrubbing tower 5 includes first order washing section 13 and second level washing section 14, and first order washing section 13 is
Rinse water washing section, second level washing section 14 are desalted water washing section.
It is washed by two-stage, carrying out washing treatment is carried out to furnace gas, prevents furnace gas to be emitted into atmospheric environment and pollutes.
It is further preferred that rinse water is arranged on first order washing section 13 recycles washing pipeline 500, it to be used for scrubbing tower 5
In furnace gas in remaining hydrogen chloride aerosol and heat absorption, while in the process, rinse water has also obtained partial concentration.
The rinse water being concentrated in scrubbing tower 5 is back in rinsing water tank 1.
Desalination water circulating pipe 400 is set on second level washing section 14, for the circulation of desalted water in scrubbing tower 5, is taken off
Salt water washing removes hydrogen chloride aerosol in furnace gas, removes the heat in furnace gas, it is ensured that the final qualified discharge of furnace gas, desalted water absorb
After hydrogen chloride aerosol, overflow enters rinse water washing section；Specific overflow position can collect water for the second level of scrubbing tower 5
Place.
Preferably, the furnace gas temperature at the furnace roof of the roaster 3 is 380~420 DEG C, at the furnace roof of the roaster 3
Pressure be -0.45~-0.5KPa.
Furnace gas temperature at furnace roof is 380~420 DEG C, guarantees rinse water thorough roasting, roasts the furnace gas and spent acid of generation
When carrying out heat exchange, spent acid can be sufficiently concentrated.Negative pressure at furnace roof remains -0.45~-0.5KPa, guarantees furnace gas pipeline
In negative pressure state.Furnace gas is delivered in absorption tower 5, and furnace gas temperature is less than 99 DEG C, in absorption tower 5, guarantees furnace gas and rinsing
Water can carry out caloic exchange, and rinse water is concentrated.
Rinse water after concentration, free acid concentration increase, the hydrogen chloride HCl gas in regenerated acid production process, in furnace gas
Body improves the production efficiency of regenerated acid in conjunction with rinse water.
Preferably, the spent acid after the heat exchange generated in the venturi 6 can introduce pre-desiliconizing sedimentation basin by gravity flow
7.Spent acid after heat exchange is the spent acid after concentration, and mobility is poor, is introduced by gravity flow, it is possible to reduce intermediate resistance,
And save energy consumption.
In the various embodiments described above, spent acid or other factory from our factory's pickling line come spent acid, spent acid can be through desiliconization at
After reason, it is delivered in venturi 6.
Spent acid is after desiliconization is handled, on the one hand, because the spent acid of non-desiliconization processing is easy the inner wall shape in conveyance conduit
At silica gel, the formation of silica gel can reduce the conveying internal diameter of pipeline, influence the operation of system, and desiliconization processing can guarantee that system is normal
Operation；On the other hand, desiliconization processing can remove the partial impurities in spent acid, and then improve final products frerrous chloride crystal
Purity；In another aspect, desiliconization handles the pH value of adjustable spent acid, the spent acid after usual pickling contains free acid, passes through addition
Steel scrap processing, it is possible to reduce the concentration of free acid, and then the concentration of ferrous ion is improved, it is final to improve final products frerrous chloride
The yield of crystal.
In the various embodiments described above, rinse water is delivered in roaster 3, wherein roaster 3 includes nozzle, the nozzle position
At the furnace roof of roaster 3, in the nozzle for the furnace roof that rinse water can be delivered to roaster 3 by force (forcing) pump, it is delivered to roasting
In the nozzle of furnace 3, misty rinse water is sprayed into roaster 3, rinse water heating surface area is uniform.
Spent acid is delivered in venturi 6 from waste acid pot 2, and specific mode of movement can be conveyed by pump；Useless
Filter can be set between sour tank 2 and pump, filter is used to filter the impurity particle in spent acid；
Frerrous chloride and the second spent acid are delivered in filter press 8 from pre-desiliconizing sedimentation basin 7, and specific mode of movement can be with
Frerrous chloride and the second spent acid are introduced into filter press 8 by diaphragm pump and carry out filters pressing.
Frerrous chloride and the second spent acid after 8 solid-liquid separation treatment of filter press, obtain frerrous chloride crystal and third is useless
Acid, since third spent acid can be back to the top of pre-desiliconizing sedimentation basin 7 by the pressure itself of filter press 8.
Third spent acid in pre-desiliconizing sedimentation basin 7 continues to be back in venturi 6, carries out heat exchange with furnace gas.
As shown in Fig. 2, on the other hand the embodiment of the present invention provides a kind of process for producing frerrous chloride, including with
Lower step:
Using the process system of the production frerrous chloride as described in the various embodiments described above；
S01, rinse water and spent acid are stored respectively, the rinse water of a part is roasted to furnace gas；
S02, the furnace gas and the spent acid carry out heat exchange, and the spent acid is concentrated, the spent acid after obtaining heat exchange and
Furnace gas after heat exchange；
Spent acid after S03, the heat exchange precipitates after crystallization through crystallisation by cooling, obtains frerrous chloride and the second spent acid；
S04, the frerrous chloride and the second spent acid obtain frerrous chloride crystal and third spent acid after filters pressing；
S05, the rinse water of another part is exchanged with the furnace gas progress caloic after the heat exchange, the drift after being concentrated
Furnace gas after wash water and caloic exchange；
It is discharged after the washed processing of furnace gas after S06, caloic exchange.
Caloic exchange is carried out by rinse water and spent acid, produces frerrous chloride crystal, simple production process is only selected from pickling
The raw material of line itself is not required to increase additional raw material, saves resource.
Wherein, after step S04, further include,
S07, the third spent acid and the furnace gas carry out heat exchange.
The third spent acid reflux, third spent acid are mixed with spent acid, carry out heat exchange with the furnace gas.Make full use of spent acid
Resource saves energy consumption.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modification-equivalent replacement and improvement etc., should all be included in the protection scope of the present invention within principle.
Claims (9)
1. a kind of process system for producing frerrous chloride, which is characterized in that including rinsing water tank, waste acid pot and pre-desiliconizing precipitating
Pond,
Setting rinsing waterpipe, the rinsing water tank are separately connected roasting by the rinsing waterpipe on the rinsing water tank
Furnace, absorption tower and scrubbing tower；
The roaster generates furnace gas, and furnace gas pipeline is arranged on the roaster, and the furnace gas transmits in the furnace gas pipeline,
The roaster is sequentially connected venturi, absorption tower and scrubbing tower according to the direction that furnace gas transmits；
The venturi is connect with waste acid pot, pre-desiliconizing sedimentation basin respectively, and pre-desiliconizing sedimentation basin connects filter press.
2. a kind of process system for producing frerrous chloride according to claim 1, which is characterized in that the venturi connection
There is one end of spent acid circulating line, the other end of spent acid circulating line is connect with the pre-desiliconizing sedimentation basin.
3. a kind of process system for producing frerrous chloride according to claim 1, which is characterized in that according to furnace gas transmission
Deduster is arranged between the roaster and the venturi in direction.
4. a kind of process system for producing frerrous chloride according to claim 3, which is characterized in that the deduster is double
Cyclone dust collectors；The bottom of the double-cyclone dust collector is connect with roaster.
5. a kind of process system for producing frerrous chloride according to claim 1, which is characterized in that according to furnace gas transmission
Blower is arranged between the absorption tower and the scrubbing tower in direction.
6. a kind of process system for producing frerrous chloride according to claim 1, which is characterized in that the scrubbing tower includes
First order washing section and second level washing section, first order washing section are rinse water washing section, and second level washing section is desalination washing
Wash section.
7. a kind of process system for producing frerrous chloride according to claim 1, which is characterized in that the furnace of the roaster
Furnace gas temperature at top is 380~420 DEG C, and the pressure at the furnace roof of the roaster is -0.45~-0.5KPa.
8. a kind of process for producing frerrous chloride, using the production chlorination as described in claim 1~7 any claim
Ferrous process system, which comprises the following steps:
Rinse water and spent acid are stored respectively, and the rinse water of a part is roasted to furnace gas；
The furnace gas and the spent acid carry out heat exchange, and the spent acid is concentrated, after the spent acid and heat exchange after obtaining heat exchange
Furnace gas；
Spent acid after the heat exchange precipitates after crystallization through crystallisation by cooling, obtains frerrous chloride and the second spent acid；
The frerrous chloride and the second spent acid obtain frerrous chloride crystal and third spent acid after filters pressing；
The rinse water of another part is carried out caloic with the furnace gas after the heat exchange to exchange, the rinse water and heat after being concentrated
Furnace gas after mass transter；
It is discharged after the washed processing of furnace gas after the caloic exchange.
9. a kind of process for producing frerrous chloride according to claim 8, which is characterized in that the frerrous chloride and
Second spent acid after the step of obtaining frerrous chloride crystal and third spent acid, further includes after filters pressing,
The third spent acid and the furnace gas carry out heat exchange.
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