CN107324283B - A kind of method of recycling treatment iron-contained industrial waste hydrochloric acid - Google Patents
A kind of method of recycling treatment iron-contained industrial waste hydrochloric acid Download PDFInfo
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- CN107324283B CN107324283B CN201710553090.0A CN201710553090A CN107324283B CN 107324283 B CN107324283 B CN 107324283B CN 201710553090 A CN201710553090 A CN 201710553090A CN 107324283 B CN107324283 B CN 107324283B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/07—Purification ; Separation
- C01B7/0706—Purification ; Separation of hydrogen chloride
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/16—Halides of ammonium
- C01C1/164—Ammonium chloride
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/36—Regeneration of waste pickling liquors
Abstract
The invention discloses a kind of methods of recycling treatment iron-contained industrial waste hydrochloric acid, comprising: (1) salting-out agents and Industry Waste hydrochloric acid is added in extracting tower, is bubbled stirring, saltoutd and air blowing desorption escapes the hydrogen chloride gas generated；(2) hydrogen chloride and bubbled gas force feed that will escape out absorb concentration by water or dilute hydrochloric acid to pickling tower, obtain technical hydrochloric acid；(3) incoagulable gas of generation is transported in extracting tower and does bubbling gas circulation；(4) waste liquid of generation is delivered to aeration reactor, reaction generates ammonium chloride or sodium chloride and iron hydroxide；(5) solidliquid mixture that step (4) generate successively is delivered to surge tank and solid-liquid separator is handled, separate iron hydroxide and ammonium chloride or sodium chloride solution；(6) a part of ammonium chloride solution or sodium chloride solution is delivered to extracting tower, another part decolourizes；(7) material after decoloration is further purified, be concentrated and/or crystallized.This method green, environmental protection, energy conservation.
Description
Technical field
The invention belongs to environment protection fields, are related to the processing of industrial ferrous contained waste hydrochloric acid, especially a kind of recycling treatment iron content
The method of Industry Waste hydrochloric acid.
Background technique
Hydrochloric acid is widely used in the techniques such as carbon steel cold rolling, zinc-plated as a kind of common chemical products.It is situated between as pickling
Matter, hydrochloric acid and steel surface generate iron oxide reaction, generate frerrous chloride and iron chloride and are dissolved in acid solution.The reaction is produced
Containing 5% or so hydrochloric acid and the frerrous chloride of 10-12% and iron chloride in raw hydrochloride waste, if the part ferrous contained hydrochloric acid
Waste liquid direct emission will cause serious environmental pollution to discharge area.In addition, containing frerrous chloride and chlorination in acid pickle
Hydrogen, it is believed that be extraordinary industrial chemicals.It therefore, is protection environment, reality to the recycling treatment of waste hydrochloric acid containing iron and utilization
The inevitable requirement of existing Green Development.
According to statistics, the pushing acid washing unit of 450,000 tons of cold-rolled steel sheets of an annual output, needs every year with 20,000 tons of hydrochloric acid or so,
Also nearly 20,000 tons of generated saliferous acid waste liquid, and the yield of China's cold-rolled steel sheet in 2010 is up to 51,000,000 tons.It counts accordingly
It calculates, only cold rolling industry annual output waste hydrochloric acid has surpassed 2,200,000 tons.It can be seen that the recycling treatment of waste hydrochloric acid, not only concerning ring
It protects, also utilization to resource and the development of circular economy can be promoted have very important significance.
There are many method of conventional process Industry Waste hydrochloric acid, have thermal decomposition method, pyrohydrolytic method, extraction, membrane separation process, sink
Shallow lake method and neutralisation.Thermal decomposition method and pyrohydrolytic method can be divided into roasting method, fluidized bed process etc., the working principle of both methods
It is identical, is all the hydrogen chloride that the waste hydrochloric acid containing frerrous chloride is reacted with oxygen at high temperature, and absorbs concentration volatilization,
Its finished product is hydrochloric acid and iron oxide red, the disadvantage is that investment is big, running cost is high, technical difficulty is big, management and maintenance maintenance are difficult.Extraction
Following the example of is to carry out counter-current extraction using the extract liquor of organic phase composition, and the method investment that extraction phase is recycled is still higher,
Operation is also inconvenient, is less applicable in.Membrane separation process be using film ion selectivity by iron and acid separate, the disadvantage is that with
Iron ion needs biggish pressure energy to input in the raising of film both sides osmotic pressure, and proposes to the material and compressive property of film
Very high requirement, initial cost and running cost are higher.The precipitation method are that the frerrous chloride in waste hydrochloric acid is made to flocculate using flocculant,
This method is although be utilized part frerrous chloride in waste hydrochloric acid, due to still there is fraction chlorination in remaining acid pickle
Ferrous iron, this makes subsequent waste acid treatment product purity rank generated generally not high, affects the performance of product.Neutralisation is adopted
It is reacted with alkali and waste hydrochloric acid, this is a kind of most ancient method of processing pickle liquor, but due to hydrogen chloride, chlorine in acid pickle
Change ferrous iron to fail to be utilized, and easily bring secondary pollution, current this method does not use substantially.
Summary of the invention
It is an object of the invention in place of overcome the deficiencies in the prior art, provide a kind of environmentally protective, small, running cost of investment
The method of low recycling treatment iron-contained industrial waste hydrochloric acid.
For this purpose, technical scheme is as follows:
A kind of method of recycling treatment iron-contained industrial waste hydrochloric acid, comprising the following steps:
(1) it is added in extracting tower using ammonium chloride solution or sodium chloride solution as salting-out agents and iron-contained industrial waste hydrochloric acid,
Under condition of negative pressure, through be bubbled stirring, saltout and air blowing desorption make reaction generate hydrogen chloride gas desorption escape；
(2) by step (1) desorption evolution hydrogen chloride and bubbled gas with compressor force feed to pickling tower, in positive pressure
Under, in pickling tower, hydrogen chloride gas absorbs concentration by water or dilute hydrochloric acid, obtains finished industrial hydrochloric acid；
(3) incoagulable gas in step (2) after the absorption of pickling tower is transported in extracting tower through choke manifold and makees drum
Steep gas circulation；
(4) waste liquid generated after step (1) depickling is delivered to aeration reactor, by ammonium hydrogen carbonate, ammonium carbonate, bicarbonate
The crystal or solution of sodium or sodium carbonate are delivered to aeration reactor, and reaction generates ferrous hydroxide and iron hydroxide, and aeration is used
Bubbled gas is passed through aeration reactor bottom, generates bubbling, in aerating oxidation and under being bubbled stirring condition, generates ammonium chloride or chlorine
Change sodium and iron hydroxide；
(5) solidliquid mixture that step (4) reaction generates successively is delivered to surge tank and solid-liquid separator, carried out respectively
Foam removal and separation iron hydroxide, isolate carbon dioxide and extra air or oxygen that reaction generates, are discharged in air；Separation
Solid out is finished product iron hydroxide, and the liquid isolated is ammonium chloride or sodium chloride solution；
(6) a part of ammonium chloride solution or sodium chloride solution that step (5) is separated is delivered in step (1)
Extracting tower, as the salting-out agents of extracting tower, another part is delivered to bleacher decoloration, sloughs partly soluble hydroxide therein
Iron；
(7) material after decoloration in step (6) is successively delivered to ammonium chloride or sodium chloride solid-liquid separator, inspissator
And/or crystallizer is further purified, is concentrated and/or crystallized, the high temperature, high strength ammonium-chloride or sodium chloride after a part concentration are molten
Liquid is delivered to salting-out agents of the step (1) as extracting tower, and another part is finished product ammonium chloride solution and/or crystal or finished product
Sodium chloride solution and/or crystal.
Preferably, the waste liquid generated after step (1) depickling successively through another extracting tower and another pickling tower processing after again
It is delivered to the aeration reactor to be handled, it may be assumed that use two-stage depickling and pickling.Firsts and seconds depickling connects both with pickling
It can connect, and can be in parallel, according to the mode of two-stage series connection, the utilization rate of waste hydrochloric acid containing iron is up to 98%, according to simultaneously
Connection can then greatly improve the speed of processing waste hydrochloric acid containing iron.
Preferably, ammonium chloride solution described in step (1) or sodium chloride solution are saturated solution.
Preferably, condition of negative pressure described in step (1) is absolute atmosphere 0.04-0.094MPa, preferred negative pressure
Condition is absolute atmosphere 0.053-0.094MPa.
Preferably, positive pressure described in step (2) is absolute atmosphere 0.121-0.5MPa, preferred positive press strip
Part is absolute atmosphere 0.121-0.398MPa.
Preferably, in step (4), the aeration is air or oxygen with bubbled gas.
In above-mentioned step (1) and step (2), the pressure of extracting tower and pickling tower adjusts and the bubbling blender gas of extracting tower
Amount control by bubbling compressor inlet duct with the three-way valve of atmosphere and throttle pipe is set in step (3)
The emptying of three-way valve is realized in the aperture and choke manifold of throttle valve on road.
In step (1), it is bubbled incoagulable gas of the gas from pickling top of tower used for the first time, in extracting tower just
Starting can be because incoagulable gas be arranged at top without completely liquid.Meanwhile it being bubbled to be equipped with the entrance of compressor and connecting open to atmosphere three
It is logical, incoagulable gas can be made to enter by combustion adjustment.
Incoagulable gas is recycled between extracting tower and pickling tower by compressor throttle valve, and chlorination in extracting tower is taken away
Hydrogen, meanwhile, the pressure difference of adjustable extracting tower and pickling tower.
The advantages and positive effects of the present invention are:
1, present invention utilizes common-ion effects promotes to give up under the action of saltouing, negative pressure parses and is bubbled stirring air lift
Hydrogen chloride gas in acid is easier to escape, so that will enter concentration in extracting tower is that the hydrochloric acid of 10wt% or so drops to
0.5wt% or less.The concentration of the hydrochloric acid recycled through pickling tower is 23wt% or so, has been recycled 95% or so in waste hydrochloric acid containing iron
Hydrochloric acid, gained hydrochloric acid can be again introduced into production link, reduce the amount of purchase of enterprise's hydrochloric acid.
2, the present invention pressurizes to the hydrogen chloride and circulation bubbled gas that come out from extracting tower using compressor, in the item of pressurization
Under part, and the characteristics of be far longer than incoagulable gas according to hydrogen chloride solubility, the concentration of the recycling hydrochloric acid improved be can be obtained
The technical hydrochloric acid that concentration is 23% or so.The incoagulable gas come out from pickling tower, and be transported to extracting tower and do bubbling circulation,
It not will cause the hydrochloric acid escape in system production, pollute atmosphere.
3, the present invention using addition ammonium hydrogen carbonate in Industry Waste hydrochloric acid toward depickling after, ammonium carbonate, sodium bicarbonate or
Crystals of sodium carbonate or solution, generating the extremely low solid content of solubility, (that is: solubility is 10 under room temperature-12The hydroxide of mol/l
Iron) and soluble salt, therefore, reaction product can be easily separated.Part soluble salt therein can be used as the salting-out agents of extracting tower, be not required to
Salting-out agents are specially purchased, has accomplished to be recycled, reduce costs.
4, oxygen or air pressurized are sent into aeration reactor by the present invention, and it is lower that ferrous hydroxide is oxidized to solubility
Ferrous oxide, and after separation of solid and liquid, obtain finished product iron hydroxide.There is no the air or oxygen of fully reacting to make to be bubbled stirring,
Reaction speed can be improved.
5, the ammonium chloride or sodium chloride after the heated concentrate of the present invention, can not only be used for salting-out agents, but also as the raw material of industry
Or fertilizer.
Entire technical process does not have waste water, waste residue, exhaust gas discharge, and whole waste hydrochloric acids obtain recycling use.Finished product is hydrogen
Hydrochloric acid, ammonium chloride or the sodium chloride of iron oxide, concentration 23% or so.Raw material is ammonium hydrogen carbonate or ammonium carbonate or sodium bicarbonate or carbon
Sour sodium, cost of material remain basically stable with ammonium chloride obtained or sodium chloride income, and other costs are only compressor, pump, blower
The heating energy consumption such as steam used in equal institutes' consuming electric power and concentration process, so operating cost of the present invention is very low, and all
Resource is applied.Therefore, this is a kind of green, environmentally friendly, energy-efficient recycling waste hydrochloric acid processing mode.
Specific embodiment
Method of the invention is described in further detail combined with specific embodiments below, following embodiment be it is descriptive,
It is not restrictive, this does not limit the scope of protection of the present invention.
The following are method one embodiment of recycling treatment iron-contained industrial waste hydrochloric acid of the invention, comprising the following steps:
1, ammonium chloride or sodium chloride solution are added under the conditions of negative pressure, bubbling:
Under the conditions of absolute atmosphere 0.053MPa to 0.094MPa, using ammonium chloride solution or sodium chloride solution as saltouing
Agent is added in extracting tower together with iron-contained industrial waste hydrochloric acid, is bubbled stirring, is being saltoutd, making chlorine under air blowing desorption and condition of negative pressure
Change the evolution of hydrogen desorption.
2, under an increased pressure, hydrogen chloride gas becomes hydrochloric acid:
The hydrogen chloride and bubbling recyclegas compressor force feed to pickling tower that desorption in step (1) is escaped.In pickling
In tower, hydrogen chloride gas absorbs concentration by water or dilute hydrochloric acid, and finished product is technical hydrochloric acid, and pickling tower operating pressure is absolute atmosphere
0.121MPa to 0.398MPa.
3, the incoagulable gas in step (2) in pickling tower is delivered in above-mentioned extracting tower through pipeline throttling and does bubbling gas
Circulation is equipped with three-way valve emptier in choke manifold.
The pressure balance of extracting tower and pickling tower is realized by adjusting the throttle valve opening on bubbled gas circulation loop.
Be bubbled the circulating air scale of construction be by open on compressor inlet duct valve in the threeway that is communicated with the atmosphere make incoagulable gas into
Enter system, increases the bubbling gas scale of construction；It either opens threeway in choke manifold and empties valve, reduce the bubbling gas scale of construction to realize
's.
4, reaction in aeration reactor:
Step (1) remaining liquid is delivered to aeration reactor, by ammonium hydrogen carbonate, ammonium carbonate, sodium bicarbonate or carbon
The crystal or solution of sour sodium are delivered to aeration reactor, and reaction generates ferrous hydroxide and iron hydroxide, by compressed air or oxygen
Gas is passed through aeration reactor bottom, generates bubbling, in aerating oxidation and under being bubbled stirring condition, generate ammonium chloride or sodium chloride with
And iron hydroxide.There is the reaction for generating ferrous hydroxide and iron hydroxide in aeration reactor, also there is ferrous hydroxide to become hydrogen
The oxidation reaction of iron oxide, the effect of reaction gas are oxidation and aeration stirring.
5, surge tank and iron hydroxide solid-liquid separator:
Reaction product in aeration reactor has a large amount of bubble and liquid foam, and reaction product is first into surge tank foam removal, so
Enter solid-liquid separator afterwards, isolate carbon dioxide and extra air or oxygen that reaction generates, the solid separated is
Finished product iron hydroxide, the liquid isolated are ammonium chloride or sodium chloride solution.
6, bleacher decolourizes:
The ammonium chloride of above-mentioned generation or a part of sodium chloride solution are added to extracting tower again, the salt as extracting tower
Analyse agent.Another part of the ammonium chloride solution or sodium chloride solution that come out from solid-liquid separator is delivered to the decoloration of step bleacher,
Slough partly soluble iron hydroxide therein.
7, ammonium chloride or sodium chloride solution further purify concentration and/or crystallization and/or salting-out agents recycling:
By after decoloration ammonium chloride or sodium chloride solution be successively delivered to ammonium chloride or sodium chloride solid-liquid separator, inspissator
And/or crystallizer is further purified, is concentrated and/or crystallized, the high temperature, high strength ammonium-chloride or sodium chloride after a part concentration are molten
Liquid is delivered to the salting-out agents to step (1) as extracting tower, and another part is finished product ammonium chloride solution and/or crystal, or at
Product sodium chloride solution and/or crystal.
The method of recycling treatment iron-contained industrial waste hydrochloric acid according to the present invention, be utilized saltout, air blowing desorption and
Under condition of negative pressure, hydrogen chloride is easier the desorption from waste hydrochloric acid and escapes；Incoagulable gas is mixed with the hydrogen chloride of low percentage composition
And after compressor pressurizes, since hydrogen chloride solubility is significantly larger than incoagulable gas, to can get the hydrochloric acid of high concentration, salt
Acid can be again introduced into production link.The incoagulable gas not dissolved then is again introduced into bubbling circulation.
Recycling treatment iron-contained industrial waste hydrochloric acid technique according to the present invention, is utilized ammonium hydrogen carbonate or ammonium carbonate or carbon
Sour sodium or sodium bicarbonate can be dissolved into water, and be easy the micro chlorination reacted with iron chloride, frerrous chloride, and can and do not extracted
Hydrogen reaction, product are ammonium chloride or the extremely low iron hydroxide of sodium chloride, carbon dioxide, solubility and ferrous hydroxide precipitating.?
It under forced air or oxygen effect, is bubbled and stirs in reactor bottom, generate under carbon dioxide agitation collective effect, can accelerate anti-
It answers, and the ferrous hydroxide that solubility can be higher than to iron hydroxide all generates iron hydroxide.
If iron chloride is allowed to react with ammonium bicarbonate soln or crystal, reaction equation are as follows:
FeCl3+3NH4HCO3=Fe (OH)3↓+3CO2↑+3NH4Cl
If frerrous chloride is allowed to react with ammonium bicarbonate soln or crystal, reaction equation are as follows:
FeCl2+2NH4HCO3=Fe (OH)2↓+2CO2↑+2NH4Cl
If iron chloride is allowed to react with sodium bicarbonate solution or crystal, reaction equation are as follows:
FeCl3+3NaHCO3=Fe (OH)3↓+3CO2↑+3NaCl
If frerrous chloride is allowed to react with ammonium bicarbonate soln or crystal, reaction equation are as follows:
FeCl2+2NaHCO3=Fe (OH)2↓+2CO2↑+2NaCl
If iron chloride is allowed to react with sal volatile or crystal, reaction equation are as follows: 2FeCl3+3H2O+3(NH4)2CO3
=2Fe (OH)3
↓+3CO2↑+6NH4Cl
If frerrous chloride is allowed to react with sal volatile or crystal, reaction equation are as follows:
FeCl2+H2O+(NH4)2CO3=Fe (OH)2↓+CO2↑+2NH4Cl
If iron chloride is allowed to react with sodium carbonate liquor or crystal, reaction equation are as follows:
2FeCl3+3H2O+3Na2CO3=2Fe (OH)3↓+3CO2↑+6NaCl
If frerrous chloride is allowed to react with sodium carbonate liquor or crystal, reaction equation are as follows:
FeCl2+H2O+Na2CO3=Fe (OH)2↓+CO2↑+2NaCl
If remaining micro hydrogen chloride and ammonium bicarbonate soln or crystal react after depickling, reaction equation are as follows:
HCl+NH4HCO3=H2O+CO2↑+NH4Cl
If remaining micro hydrogen chloride and sodium bicarbonate solution or crystal react after depickling, reaction equation are as follows:
HCl+NaHCO3=H2O+CO2↑+NaCl
If remaining micro hydrogen chloride and sal volatile or crystal react after depickling, reaction equation are as follows:
2HCl+(NH4)2CO3=H2O+CO2↑+2NH4Cl
If remaining micro hydrogen chloride and sodium carbonate liquor or crystal react after depickling, reaction equation are as follows:
2HCl+Na2CO3=H2O+CO2↑+2NaCl
Become iron hydroxide, reaction equation using ferrous hydroxide after forced air or oxygen aeration are as follows:
4Fe(OH)2+O2+2H2O=4Fe (OH)3
So far, it is brilliant all to become the extremely low iron hydroxide of solubility for the frerrous chloride in aeration reactor, iron chloride
Grain.React micro- excessive ammonium hydrogen carbonate, ammonium carbonate, sodium bicarbonate or carbon in the ammonium chloride generated or sodium chloride solution and reaction
Sour sodium is also the form of solution, and the hydrogen chloride in solution also becomes soluble salt completely, it is easy to pass through gravitational settling or centrifugation
It realizes separation, can be used as the raw material of industry after iron hydroxide therein is washed.If product is ammonium chloride, steel can be again introduced into
Ferrous acid washes industry, and pickling enterprise can not need to purchase the ammonium chloride needed in acid cleaning process again, remaining ammonium chloride can be used as
Chemical fertilizer or as other industrial chemicals；If product is sodium chloride, it crystallized can use, also can be used as anti-as Nacl afterwards
Freeze agent or snow melt salt.
Claims (9)
1. a kind of method of recycling treatment iron-contained industrial waste hydrochloric acid, it is characterised in that the following steps are included:
(1) it is added in extracting tower using ammonium chloride solution or sodium chloride solution as salting-out agents and iron-contained industrial waste hydrochloric acid, negative
Under the conditions of pressure, through be bubbled stirring, saltout and air blowing desorption make reaction generate hydrogen chloride gas desorption escape；
(2) hydrogen chloride and bubbled gas compressor force feed to pickling tower for escaping step (1) desorption, under positive pressure,
In pickling tower, hydrogen chloride gas absorbs concentration by water or dilute hydrochloric acid, obtains finished industrial hydrochloric acid；
(3) incoagulable gas in step (2) after the absorption of pickling tower is transported in extracting tower through choke manifold and does bubbling gas
Circulation；
(4) waste liquid generated after step (1) depickling is delivered to aeration reactor, by ammonium hydrogen carbonate, ammonium carbonate, sodium bicarbonate,
Or the crystal or solution of sodium carbonate are delivered to aeration reactor, reaction generates ferrous hydroxide and iron hydroxide, by aeration drum
Bubble gas is passed through aeration reactor bottom, generates bubbling, in aerating oxidation and under being bubbled stirring condition, generates ammonium chloride or chlorination
Sodium and iron hydroxide；
(5) solidliquid mixture that step (4) reaction generates successively is delivered to surge tank and solid-liquid separator, carries out foam removal respectively
With separation iron hydroxide, isolate reaction generate carbon dioxide and extra air or oxygen, the solid separated be at
Product iron hydroxide, the liquid isolated are ammonium chloride or sodium chloride solution；
(6) depickling being delivered to a part of ammonium chloride solution or sodium chloride solution that step (5) is separated in step (1)
Tower, as the salting-out agents of extracting tower, another part is delivered to bleacher decoloration, sloughs partly soluble iron hydroxide therein；
(7) by the material after decoloration in step (6) be successively delivered to ammonium chloride or sodium chloride solid-liquid separator, inspissator and/or
Crystallizer is further purified, is concentrated and/or crystallized, and the high temperature, high strength ammonium-chloride or sodium chloride solution after a part concentration are defeated
The salting-out agents to step (1) as extracting tower are sent, another part is finished product ammonium chloride solution and/or crystal or finished product chlorination
Sodium solution and/or crystal.
2. according to the method described in claim 1, it is characterized by: the waste liquid generated after step (1) depickling is successively through another de-
The aeration reactor is delivered to again after acid tower and the processing of another pickling tower to be handled.
3. method according to claim 1 or 2, it is characterised in that: ammonium chloride solution described in step (1) or sodium chloride are molten
Liquid is saturated solution.
4. method according to claim 1 or 2, it is characterised in that: condition of negative pressure described in step (1) is absolute atmosphere
0.04-0.094MPa。
5. according to the method described in claim 4, it is characterized by: condition of negative pressure described in step (1) is absolute atmosphere
0.053-0.094MPa。
6. method according to claim 1 or 2, it is characterised in that: positive pressure described in step (2) is absolute atmosphere
0.121-0.5MPa。
7. according to the method described in claim 6, it is characterized by: positive pressure described in step (2) is absolute atmosphere
0.121-0.398MPa。
8. method according to claim 1 or 2, it is characterised in that: in step (4), the aeration is empty with bubbled gas
Gas or oxygen.
9. method according to claim 1 or 2, it is characterised in that: in the step (1) and step (2), extracting tower and acid
Wash tower pressure adjust and extracting tower bubbling stirring tolerance control pass through bubbling compressor inlet duct on atmosphere
Three-way valve and be arranged in step (3) in choke manifold in the aperture and choke manifold of throttle valve three-way valve emptying
To realize.
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| CN111233044B (en) * | 2020-03-09 | 2022-07-08 | 福建坚石电力线路器材有限公司 | Process method for recycling hot galvanizing pickling waste liquid through reduced pressure aeration |
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