CN208414558U - A kind of volatile spent acid Recovery Purifying equipment - Google Patents
A kind of volatile spent acid Recovery Purifying equipment Download PDFInfo
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- CN208414558U CN208414558U CN201821142471.6U CN201821142471U CN208414558U CN 208414558 U CN208414558 U CN 208414558U CN 201821142471 U CN201821142471 U CN 201821142471U CN 208414558 U CN208414558 U CN 208414558U
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Abstract
The utility model discloses a kind of volatile spent acid Recovery Purifying equipment, first inlet and the second inlet are set on evaporator tank body, second inlet and the first inlet are connect with spent acid fluid reservoir and sulfuric acid storage tank respectively, heater is set outside evaporator tank body, the outlet of condenser and evaporator connects, and is sequentially connected receiving tank and vacuum pump set in condenser bottom.The utility model increases setting sulfuric acid measuring tank on an evaporator, after evaporation 2 ~ 3 times, quantitative sulfuric acid is added in evaporator, waste liquid forms nitric acid, hydrofluoric acid through sulfate substitution, and nitrate, fluoride are converted into sulfate simultaneously.On the one hand solve the problems, such as that nitrate, fluoride processing are difficult, it is only necessary to handle a small amount of raffinate (predominantly sulfate) remaining after displacement, Solid state fermentation is more convenient；The waste acidity recovery rate of another aspect the utility model can achieve 90% or more, and sulfate substitution obtains that nitric acid, the economic value of hydrofluoric acid are higher relative to sulfuric acid, and economic value is high.
Description
Technical field
The utility model relates to waste acid treatment field, especially a kind of volatile spent acid Recovery Purifying equipment.
Background technique
The non-ferrous metals such as stainless steel and titanium, nickel, zirconium (plate, band, pipe, stick, wire rod) require to carry out chemistry using pickling solution
Pickling, to remove the oxidation corrosion object on surface, it is ensured that the quality and gloss of product surface, nitric acid, hydrofluoric acid mix acid liquor can
With the metal high for pickling corrosion resistance, added value is high.A large amount of pickle liquor, nitric acid, hydrogen fluorine can be generated in acid cleaning process
Waste liquid after the mix acid liquor pickling of acid contains nitrate and fluoride, and nitrate, which enters, will increase total nitrogen content in water body, fluorine
Compound is a kind of emission control index, as direct emission will cause serious environmental pollution, it is necessary to which adopting an effective measure, it is useless to handle
Liquid.
Currently used waste acid treatment mode has neutralization precipitation processing, heating evaporation, spray roasting, ion exchange etc., in
It is that the cleaning waste water merging treatment of spent acid and acid cleaning process production is adjusted into the pH value of composite waste with precipitation process, processing is mixed
The pollution factor in waste water is closed, chemical precipitates is sent to environmental authorities' designated place control after up to standard and is stored up, this method is being located
It needs to be added a large amount of calcium hydroxide etc. during reason to neutralize, precipitate medicament, and a large amount of needs containing solid waste of heavy metal can be generated
Professional treatment.Spray roasting technique is recycled using high-temperature decomposition, and the regenerative mixed acid of recycling can be recycled, but this work
Skill capital intensive needs to introduce external technology and key equipment.Ion-exchange process is recycled useless using ion exchange resin
The acid of free state in acid, but ion-exchange process is only capable of the free acid in waste acid recovery, cannot completely remove the gold in spent acid
Belong to ion, overall recovery is relatively low, and still there are a large amount of waste liquids that neutralization precipitation is needed to handle.Chinese patent ZL2014206835876
A kind of system of heating evaporation processing spent acid is disclosed, but it is applicable only to waste hydrochloric acid, the mixing for nitric acid, hydrofluoric acid is useless
The acid solution of this highly corrosive of acid, not can be removed the nitrate ion and fluorine ion in waste liquid, because nitrate and fluoride are not
Energy direct emission, therefore also need to spend great amount of cost processing recycling nitrate and fluoride.
Utility model content
The applicant provides a kind of structure conjunction for the limitation of evaporation process spent acid system application in above-mentioned existing production
The volatile spent acid Recovery Purifying equipment of reason removes nitrate ion and fluorine ion in spent acid simultaneously in removal process, gives up
Slag treatment is more convenient, and environmental benefit and economic value are high.
Technical solution used by the utility model is as follows:
A kind of volatile spent acid Recovery Purifying equipment, is arranged the first inlet and the second inlet on evaporator tank body,
Second inlet and the first inlet are connect with spent acid fluid reservoir and sulfuric acid storage tank respectively, and heating is arranged outside evaporator tank body
The outlet of device, condenser and evaporator connects, and is sequentially connected receiving tank and vacuum pump set in condenser bottom.
As a further improvement of the above technical scheme:
Spent acid measuring tank is set between the second inlet and spent acid fluid reservoir.
Sulfuric acid measuring tank is set between the first inlet and sulfuric acid storage tank.
Surge tank is set between receiving tank and vacuum pump set.
The receiving tank is several being arranged in parallel.
The heater forms the circuit being connected to evaporator.
Water outlet and water inlet are respectively set above and below condenser.
Base of evaporator connects deslagging tank.
The beneficial effects of the utility model are as follows:
Why acid pickle cannot be further continued for pickling, be primarily due to metal ion in acid solution and have reached saturation, rate of corrosion
It reduces.The utility model utilizes the lower principle of boiling point of nitric acid (boiling point is 83 DEG C) and hydrofluoric acid (boiling point is 20 DEG C), to useless
Acid carries out heating evaporation, so that nitric acid, hydrofluoric acid and water is all converted into vapour phase from liquid phase evaporation, then be by condensing vapor-phase conversion
Liquid phase, to recycle nitric acid, hydrofluoric acid.In evaporation process, metal ion and salt constituents in spent acid are not vaporized, because
This, evaporates without containing metal ion in the nitric acid and hydrofluoric acid of recycling, and acid solution is limpid, is used directly for pickling production；It is whole
A spent acid Recovery Purifying process will not generate secondary pollution.
Acid solution heating needs heat source, and in order to reduce the evaporating temperature of spent acid, complete equipment aspirates to be formed using vacuum pump set
Negative pressure makes spent acid begin to evaporate at 50 DEG C, saves the use of heat source.The vacuum pump set of the utility model is not connected directly to steam
Device is sent out, but receiving tank is connected to by surge tank, can prevent vacuum pump set from intaking, plays the role of protecting vacuum pump set；
Surge tank can also collect gas phase, prevent the uncooled vapour phase escape of minimal amount.
The utility model has very high environmental benefit and economic value, contains simultaneously in the spent acid that nitric acid and hydrofluoric acid mix
There are the salts substances for being difficult to recycle of the formation such as nitrate ion, fluorine ion, the utility model increases setting sulphur on an evaporator
Quantitative sulfuric acid is added after evaporation 2 ~ 3 times according to nitrate, fluoride concentration in spent acid in sour measuring tank in evaporator,
Waste liquid forms nitric acid, hydrofluoric acid through sulfate substitution, and nitrate, fluoride are converted into sulfate simultaneously.On the one hand nitric acid is solved
The difficult problem of salt, fluoride processing, after the purified recycling of spent acid, it is only necessary to a small amount of raffinate (predominantly sulphur remaining after displacement
Hydrochlorate) it is handled, sulfate, which need to only carry out crystallization extraction or neutralization precipitation processing, can both recycle, and Solid state fermentation is more square
Just；The waste acidity recovery rate of another aspect the utility model can achieve 90% or more, and sulfate substitution obtains the warp of nitric acid, hydrofluoric acid
Ji value is higher relative to sulfuric acid, and the regenerating spent acid that Recovery Purifying obtains can be reused directly for pickling production and application, has higher
Economic value.
Equipment investment expense needed for the utility model is low, easy to operate, easily operation and maintenance.The utility model can be wide
The general purification for being applied to the spent acid using the generation after volatile acid cleaning metal (stainless steel, special steel, titanium or titanium alloy etc.)
Recovery processing.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
In figure: 1, evaporator；2, the first inlet；3, the second inlet；4, sulfuric acid measuring tank；5, spent acid measuring tank；6,
Heater；7, deslagging tank；8, the first receiving tank；9, the second receiving tank；10, surge tank；11, vacuum pump set；12, it exports；13, go out
The mouth of a river；14, condenser；15, water inlet.
Specific embodiment
With reference to the accompanying drawing, illustrate specific embodiment of the present utility model.
As shown in Figure 1, connect in the setting of the middle and upper part of 1 tank body of the utility model evaporator with sulfuric acid measuring tank 4 first
Inlet 2, sulfuric acid measuring tank 4 is based on temporarily storing the sulfuric acid from sulfuric acid storage tank and carrying out before sulfuric acid enters evaporator 1
Amount, in order to F in spent acid-、NO3 -The salt of formation carries out Recovery Purifying, according to different acid-spending strengths, after evaporation 2 ~ 3 times,
Add suitable sulfuric acid, H in sulfuric acid+Preferentially and F-、NO3 -In conjunction with generation nitric acid, hydrofluoric acid mix acid liquor, nitric acid, the hydrogen of generation
Fluoric acid mix acid liquor is recycled by evaporative condenser, is recycled more thorough.Setting and spent acid measuring tank 5 in the lower section of the first inlet 2
Second inlet 3 of connection, spent acid measuring tank 5 is for temporarily storing the spent acid from spent acid fluid reservoir and entering evaporation in spent acid
It is measured before device 1.Heater 6 is set outside 1 tank body of evaporator, and heater 6 forms the circuit being connected to, spent acid with evaporator 1
Right-hand circular flows in heater 6 and evaporator 1 under the action of thermal cycle, and spent acid enters after heater 6 by heater 6
Heating.Slag-drip opening is set in 1 tank base of evaporator, slag-drip opening is connect with deslagging tank 7.The setting outlet 12 at the top of evaporator 1,
The top of condenser 14 is connect with outlet 12, and the water outlet 13 of cooling circulating water is respectively set above and below condenser 14
With water inlet 15, cooling circulating water is for cooling down condenser 14, so that the vapour phase in cooling condenser 14 is allowed to be converted into liquid phase.
In the receiving tank of 14 bottom of condenser connection several groups parallel connection, receiving tank number can be determined according to the flow of finished acid.Such as Fig. 1
Shown, 2 receiving tanks are arranged in the present embodiment, and the first receiving tank 8 and the second receiving tank 9 are separately connected surge tank 10, surge tank 10
Vacuum pump set 11 is connected, the first receiving tank 8 and the second receiving tank 9 are arranged in parallel alternation, discharge finished product in the first receiving tank 8
When sour, finished acid is collected by the second receiving tank 9, when the second receiving tank 9 discharges finished acid, finished product is collected by the first receiving tank 8
Acid.Liquid is not stored in surge tank 10, on the one hand can collect gas phase, prevents the uncooled vapour phase escape of minimal amount, another party
Face can prevent vacuum pump set 11 from intaking, and the equipment such as damage vacuum pump play the role of protecting vacuum pump set 11.1 He of evaporator
Condenser 14 forms negative pressure using the suction of vacuum pump set 11, can reduce the evaporating temperature of spent acid, open spent acid just at 50 DEG C
Begin to evaporate, saves the use of heat source.
The course of work for illustrating the utility model underneath with nitric acid, hydrofluoric acid mixing spent acid, by nitric acid, hydrofluoric acid it is mixed
It closes acid solution and is delivered to spent acid measuring tank 5.Start vacuum pump set 11, evaporator 1, heater 6, the first receiving tank 8, the second receiving tank
9, surge tank 10, condenser 14 aspirate under the action of vacuum pump set 11 and establish negative pressure, and negative pressure working range 0.07 ~
0.09MPa.Then, spent acid enters evaporator 1 from the second inlet 3, starts heater 6, spent acid is in evaporator 1 and heater 6
Middle right-hand circular flowing, after heated device 6 heats, nitric acid, hydrofluoric acid and water in spent acid become vapour phase from liquid phase, from evaporation
The outlet 12 of device 1 enters condenser 14.Recirculated cooling water is connected in condenser 14, nitric acid, hydrofluoric acid and the water condensation of vapour phase are
Liquid phase, the finished acid being purified, subsequent finished acid enters the first receiving tank 8, cold after the first receiving tank 8 collects full finished acid
It coagulates the finished acid to get off and enters the second receiving tank 9, the finished acid in the first receiving tank 8 is discharged from bottom to be recycled, and first connects
Closed cans 8 and the second receiving tank 9 work alternatively.After spent acid evaporates 2 ~ 3 times, the first inlet 2 is opened, sulfuric acid enters from sulfuric acid storage tank
Sulfuric acid measuring tank 4 subsequently enters evaporator 1, sulfuric acid and F-、NO3 -In conjunction with nitric acid, hydrofluoric acid mix acid liquor is formed, then mix
Acid solution is evaporated, condenses and recycled, and opens slag-drip opening after completing whole recovery operations, waste residue enters deslagging tank 7.Due to using
The mode of sulfate substitution eliminates nitrate ion and fluorine ion in waste liquid, therefore be finally discharged into deslagging tank 7 is only few
It measures raffinate (predominantly sulfate), sulfate directly passes through crystallization extraction or neutralization precipitation is i.e. recyclable, and Solid state fermentation is simpler；
The nitric acid of another aspect sulfate substitution formation, the economic value of hydrofluoric acid are higher relative to sulfuric acid.
Above description is the explanation to the utility model, is not the restriction to utility model, without prejudice to the utility model
In the case where spirit, the utility model can make any type of modification.
Claims (8)
1. a kind of volatile spent acid Recovery Purifying equipment, it is characterised in that: the first inlet is arranged on evaporator (1) tank body
(2) connect respectively with spent acid fluid reservoir and sulfuric acid storage tank with the second inlet (3), the second inlet (3) and the first inlet (2)
It connects, is arranged heater (6) outside evaporator (1) tank body, condenser (14) is connect with the outlet (12) of evaporator (1), is being condensed
Device (14) bottom is sequentially connected receiving tank and vacuum pump set (11).
2. volatile spent acid Recovery Purifying equipment described in accordance with the claim 1, it is characterised in that: the second inlet (3) with
Spent acid measuring tank (5) are set between spent acid fluid reservoir.
3. volatile spent acid Recovery Purifying equipment described in accordance with the claim 1, it is characterised in that: in the first inlet (2) and
Sulfuric acid measuring tank (4) are set between sulfuric acid storage tank.
4. volatile spent acid Recovery Purifying equipment described in accordance with the claim 1, it is characterised in that: in receiving tank and vacuum pump set
(11) surge tank (10) are set between.
5. volatile spent acid Recovery Purifying equipment described in accordance with the claim 1, it is characterised in that: the receiving tank sets for parallel connection
Set several.
6. volatile spent acid Recovery Purifying equipment described in accordance with the claim 1, it is characterised in that: the heater (6) and steaming
Send out the circuit that device (1) forms connection.
7. volatile spent acid Recovery Purifying equipment described in accordance with the claim 1, it is characterised in that: in the top of condenser (14)
Be respectively arranged below water outlet (13) and water inlet (15).
8. volatile spent acid Recovery Purifying equipment described in accordance with the claim 1, it is characterised in that: the connection of evaporator (1) bottom
Deslagging tank (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821142471.6U CN208414558U (en) | 2018-07-19 | 2018-07-19 | A kind of volatile spent acid Recovery Purifying equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821142471.6U CN208414558U (en) | 2018-07-19 | 2018-07-19 | A kind of volatile spent acid Recovery Purifying equipment |
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| Publication Number | Publication Date |
|---|---|
| CN208414558U true CN208414558U (en) | 2019-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821142471.6U Active CN208414558U (en) | 2018-07-19 | 2018-07-19 | A kind of volatile spent acid Recovery Purifying equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110170177A (en) * | 2019-06-17 | 2019-08-27 | 江阴市欧姆机械设备有限公司 | Evaporative condenser |
| CN115228236A (en) * | 2022-06-21 | 2022-10-25 | 青岛中平环境技术研究院有限公司 | Fixed bed VOCs gas treatment and recovery device |
-
2018
- 2018-07-19 CN CN201821142471.6U patent/CN208414558U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110170177A (en) * | 2019-06-17 | 2019-08-27 | 江阴市欧姆机械设备有限公司 | Evaporative condenser |
| CN115228236A (en) * | 2022-06-21 | 2022-10-25 | 青岛中平环境技术研究院有限公司 | Fixed bed VOCs gas treatment and recovery device |
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