CN107265584A - A kind of recovery system and method for steel mixing pickle liquor - Google Patents
A kind of recovery system and method for steel mixing pickle liquor Download PDFInfo
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- CN107265584A CN107265584A CN201710498545.3A CN201710498545A CN107265584A CN 107265584 A CN107265584 A CN 107265584A CN 201710498545 A CN201710498545 A CN 201710498545A CN 107265584 A CN107265584 A CN 107265584A
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- nitration mixture
- acid
- settling tank
- tank
- pickle liquor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
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- Removal Of Specific Substances (AREA)
Abstract
The present invention's discloses a kind of recovery system and method for steel mixing pickle liquor, specifically includes nitration mixture precipitation unit, automatic cycle control process unit and acid regeneration unit.Nitration mixture precipitation unit is made up of nitration mixture descaling bath, nitration mixture settling tank and acid regeneration unit, nitration mixture settling tank lower end side port connection acid regeneration unit.The present invention passes through a series of Automated condtrols, control dope sedimentation time; mixed base is added as precipitating reagent and controls its pH; make the mud granule in acid solution by certain time natural sedimentation, mud granule obtains the recovery acid solution of primes and seconds after being separated from acid solution, clean medium is provided for acid regeneration unit; ensure the stable operation of acid regeneration unit; mud granule content in the sour dope of reduction, improves pickling efficiency, has saved production cost; industrial refuse is reduced, environment is protected.
Description
Technical field
The invention belongs to industrial wastewater recycle utilization technology field, and in particular to a kind of recovery of steel mixing pickle liquor
System and method.
Background technology
Substantial amounts of pickle liquor can be produced in steel surface acid cleaning process, pickle liquor mainly contains certain density sulfuric acid
Or hydrochloric acid, substantial amounts of ferrous ion, a small amount of manganese ion, heavy metal ion and the arsenic such as micro lead, cadmium, mercury, copper, cobalt, nickel
It is a kind of highly acid, highly toxic waste liquid etc. nonmetallic poisonous and harmful substance.Conventional method one located using neutralization precipitation method
Pickle liquor is managed, is bothered because neutralization precipitation method can produce a large amount of sludge, sludge dispoal in processing procedure, is also easy to produce secondary dirt
Dye, simultaneously, in pickle liquor there is that the wastings of resources such as the iron and spent acid of value are more serious, and neutralization precipitation method has not been inconsistent
Close modern steel and produce green, sustainable and recycling economy idea of development, thus the technology gradually eliminated.Therefore, visit
The recycling processing method tool for studying carefully suitable pickle liquor is of great significance.
CLEANOX has without environmental protection without nitric acid acidwashing technique, efficiently, energy-conservation the features such as, can thoroughly go in removing exhaust gas NOx with
And the NO in waste water3 -Discharge, breaks off polluted by nitrogen, and reduce the carbon dioxide produced during acid recovery from root.But at it
In processing procedure, its oxidized sludge particle produced is highly soluble in acid solution so that the structures such as pipeline, reaction tank occur serious
Fouling, the problems such as block, operation has some setbacks, and ultimately causes acid and acid regeneration unit is destroyed, and influence pickling efficiency and acid are again
Raw operating cost.At " a kind of stainless steel is without nitric acid acidwashing waste water treatment process "（Application number：201610446812.8）And
" the processing recovery method and its system of a kind of steel industry sulfuric acid pickling waste liquid "（Application number：201610869341.1）In can be with
Find out, electrochemistry combination precipitating reagent handling process and bipolar membrane electrodialysis system handling process is respectively adopted successfully in two methods
More pure pickle has been reclaimed, but the preprocessor of the handling process of two methods is all relatively complicated.
The content of the invention
（1）The technical problem to be solved
The present invention easily causes water pollution to overcome traditional steel acid lotion to reclaim energy resource consumption height, it is impossible to automatic rule
The shortcoming of modelling production, the technical problem to be solved in the present invention is to provide a kind of recovery system of steel mixing pickle liquor and side
Method, the invention uses nitration mixture precipitation unit, automatic cycle control process unit and acid regeneration unit so that mud granule is from acid solution
Clean acid is obtained after middle separation, and reenters pickling unit, it is cost-effective, improve pickling utilization rate and operating efficiency.
（2）Technical scheme
In order to solve the above-mentioned technical problem, the invention provides the recovery system of such a steel mixing pickle liquor, specifically
Including nitration mixture precipitation unit, automatic cycle control process unit and acid regeneration unit, described nitration mixture precipitation unit is by nitration mixture acid
Washing trough, nitration mixture settling tank and acid regeneration unit composition, the nitration mixture settling tank described in described nitration mixture descaling bath lower end outlet connection
Upper end import, centre is with diaphragm valve control, and the connection acid regeneration unit described in described nitration mixture settling tank lower end side port is described
The described nitration mixture circulating tank of nitration mixture settling tank lower end base opening connection, the described nitration mixture descaling bath structure of described nitration mixture circulating tank connection
Into a circulatory system.
Two described descaling baths are connected in series with each other composition, and preferably two descaling baths are connected in series composition, nitration mixture precipitation
Tank is connected with acid regeneration unit using difference in height mode.
Described nitration mixture settling tank is used for back with being additionally provided with 1-2 horizontal circulation pump in the connecting pipe of nitration mixture circulating tank
Acid.
Described pneumatic diaphragm pump side pipe connects an air compression port, the pipeline reducing diameter of pneumatic diaphragm pump inlet pipe by 65-50,
The pipeline reducing diameter of outlet pipe is by 50-65.
According to above-mentioned system, the present invention uses a kind of recovery method of steel mixing pickle liquor, and its specific steps is such as
Under：
A. acid filling：Nitration mixture descaling bath valve is opened, the acid solution in nitration mixture descaling bath is passed into nitration mixture settling tank, flow control
It is 70-100mm, nitration mixture precipitation that the pipeline nominal diameter in nitration mixture settling tank is flowed to below 0.8-2.5m/s, nitration mixture descaling bath
Diaphragm valve above tank tank skin opens overflow, and other all valves are in closed mode.
B. alkali is noted：0.5-1.2mol/L is first passed through when the acid solution volume in nitration mixture settling tank reaches the 70-80% of tank volume
Hydrogen peroxide solution, the 0.5-1% for accounting for acid solution volume of hydrogen peroxide solution volume is then injected into 3.5-5mol/L sodium carbonate and 3-
The mixed ammonium/alkali solutions regulation pH of 4.5mol/L sodium hydroxides, pH is between 2.3-3.5 for control；
C. precipitate：After to be precipitated dose of addition is finished, the acid liquor temperature opened in mixer stirring 3-5min, nitration mixture settling tank is maintained
At 65-75 DEG C, the sedimentation time is 200-400min, to ensure the smooth natural subsidence of suspension, prevents cohesion from blocking pipeline.
D. for acid：Nitration mixture settling tank and nitration mixture circulating tank difference in height are between 3-6m, by Valve controlling nitration mixture settling tank,
Acid regeneration surge tank is given for acid in the way of flow by gravity, flow velocity is 0.8-3m/s.
E. blowdown：The pneumatic diaphragm valve blowdown below nitration mixture settling tank is opened, sludge flow control is in 0.1-0.5m/s.
F. acid is returned：After spoil disposal terminates, spoil disposal valve is closed, and is opened to start with the tank connected pneumatic diaphragm pump of nitration mixture circulation and is opened
Begin back acid, and pneumatic diaphragm pump discharge pressure maintains 2-5 × 102KPa, flow velocity is 2-4m/s, the temperature control of nitration mixture circulating tank
At 60-70 DEG C, time acid terminates all operated pneumatic valves after the time arrives and pump is closed, and a precipitation cyclic process terminates.
As the preferred embodiment of the present invention, in step a, the acid solution in described nitration mixture descaling bath is passed into described
Flow velocity in nitration mixture settling tank is that the diaphragm valve above 1.5-2m/s, described nitration mixture settling tank tank skin is pneumatic diaphragm valve, institute
It is 80mm that the pipeline nominal diameter in nitration mixture settling tank is flowed to below the nitration mixture descaling bath stated.
A. as the preferred embodiment of the present invention, in step b, treat that the acid solution volume in nitration mixture settling tank reaches tank volume
70% when be first passed through 0.8-1.0mol/L hydrogen peroxide solution, the 0.7-0.9% for accounting for acid solution volume of hydrogen peroxide solution volume, so
The mixed ammonium/alkali solutions regulation pH of injection 3.9-4.5mol/L sodium carbonate and 3.5-4.0mol/L sodium hydroxides, controls pH in 2.8- afterwards
3.0 between.
As the preferred embodiment of the present invention, in step c, the preferred 70- of acid liquor temperature in described nitration mixture settling tank
72 DEG C, sedimentation time preferred 240-300min.
As the preferred embodiment of the present invention, step d, preferable flow rate supplies acid for the mode of 1.5-2m/s flow by gravity
Give acid regeneration unit.
As the preferred embodiment of the present invention, in step e, the preferred 0.2-0.3m/s of sludge flow velocity.
As the preferred embodiment of the present invention, in step f, described pneumatic diaphragm pump discharge pressure maintain 3-4 ×
102KPa, flow velocity is 2.5-3.5m/s, and the temperature control of nitration mixture circulating tank is at 64-68 DEG C.
（3）Beneficial effect
Beneficial effects of the present invention：By a series of Automated condtrols, control dope sedimentation time, make the mud granule in acid solution
By certain time natural sedimentation, mud granule obtains the recovery acid solution of primes and seconds after being separated from acid solution, and ties
Close automatic cycle control process unit and reenter etching procedures by pickle.Mixed base is added as precipitating reagent and controls its pH,
The mud granule in acid solution is set to provide clean medium for acid regeneration unit by certain time natural sedimentation, technology mode is simple
And effectively, it is ensured that the stable operation of acid regeneration unit, cost-effective, the mud granule content in the sour dope of reduction, improve pickling
Efficiency, has saved production cost, reduces industrial refuse, protects environment.
Brief description of the drawings
Fig. 1 is the recovery system process chart of mixing pickle liquor.
Embodiment
With reference to embodiment, the present invention is further illustrated.
Embodiment one
As shown in figure 1, the system involved by the implementation case specifically includes nitration mixture precipitation unit (A) and automatic cycle control process
Unit (B), described nitration mixture precipitation unit (A) is by nitration mixture descaling bath (7,8), nitration mixture settling tank (1,2) and acid regeneration unit (C)
Composition, nitration mixture settling tank (1,2) upper end import described in described nitration mixture descaling bath (7,8) lower end outlet connection, it is middle with every
Film valve is controlled, the connection acid regeneration unit (C) described in described nitration mixture settling tank (1,2) lower end side port, described nitration mixture precipitation
The described nitration mixture circulating tank (5,6) of tank (1,2) lower end base opening connection, the described nitration mixture of described nitration mixture circulating tank (5,6) connection
Descaling bath (7,8) constitutes a circulatory system.
Described two nitration mixture descaling baths (7,8) are serially connected composition, described nitration mixture settling tank (1,2) and acid regeneration list
First (C) is connected using difference in height mode, and described nitration mixture settling tank (1,2) in the connecting pipe of nitration mixture circulating tank (5,6) with going back
It is used for back acid provided with 2 horizontal circulation pumps, described pneumatic diaphragm pump (3,4) side pipe connects an air compression port, described gas
The pipeline reducing diameter of dynamic membrane pump (3,4) inlet pipe is by 65-50mm, and the pipeline reducing diameter of outlet pipe is by 50-65mm.
According to above-mentioned system, the present invention uses a kind of recovery method of steel mixing pickle liquor, and its specific steps is such as
Under：
A. acid filling：Pneumatic diaphragm valve（9,10,11,12）The waste liquid opened in acid filling, acid storage is passed through settling tank（1）Precipitation, is mixed
Sour acid storage（8）In waste liquid be passed through settling tank（2）Precipitation, pneumatic diaphragm valve（13,14,15,16）Open overflow, other valves
Close All, acid filling flow control is in 1.5m/s, and the acid filling time is 30min.
B. alkali is noted：First it is passed through 0.8mol/L's when the acid solution volume in nitration mixture settling tank (1,2) reaches the 70% of tank volume
Hydrogen peroxide solution, account for acid solution volume the 0.7% of hydrogen peroxide solution volume, it is then injected into 3.9mol/L sodium carbonate and 3.5mol/L
The mixed ammonium/alkali solutions regulation pH of sodium hydroxide, pH is between 2.8 for control.
C. precipitate：After to be precipitated dose of addition is finished, the acid solution in mixer stirring 3min, nitration mixture settling tank (1,2) is opened
Temperature maintains 70 DEG C, and the sedimentation time is 240min, precipitation all valves closings during standing.
D. for acid：Precipitate after the completion of process, first open valve（17）It is supplied to acid regeneration unit (C) to enter the acid precipitated
Row treatment for reuse, nitration mixture settling tank（1）Terminate rear nitration mixture settling tank for acid（2）Start for acid, valve（18）Opening will be precipitated
Acid be supplied to acid regeneration unit (C) carry out treatment for reuse, for sour flow velocity be 1.5m/s, for the sour time be 120min, with gravity
The mode of gravity flow gives acid regeneration surge tank for acid（26）.
E. blowdown：After terminating for acid, valve（18,17）Close, valve（20,22）Open and start blowdown mud, sludge flow velocity
Control is in 0.2m/s, and blowing time is 16s.
F. acid is returned：After spoil disposal terminates（20,22）Close, valve（19,24）Open, pneumatic diaphragm pump (3,4) pneumatic beginning
Return sour nitration mixture circulating tank（5）, pneumatic diaphragm pump (3,4) outlet pressure maintains 3 × 102KPa, the temperature control of circulating tank is 64
DEG C, it is closing pneumatic diaphragm valve (19,24) after 2.5m/s, 5min to return sour flow velocity, switches to nitration mixture circulating tank（6）Acid is returned, is opened
Pneumatic diaphragm pump (3,4), nitration mixture circulating tank（6）Start back acid, return after sour flow velocity is 2.5m/s, 5min, all operated pneumatic valves and
Pump is closed.
Embodiment two
As shown in figure 1, the system involved by the implementation case specifically includes nitration mixture precipitation unit (A) and automatic cycle control process
Unit (B), described nitration mixture precipitation unit (A) is by nitration mixture descaling bath (7,8), nitration mixture settling tank (1,2) and acid regeneration unit (C)
Composition, nitration mixture settling tank (1,2) upper end import described in described nitration mixture descaling bath (7,8) lower end outlet connection, it is middle with every
Film valve is controlled, the connection acid regeneration unit (C) described in described nitration mixture settling tank (1,2) lower end side port, described nitration mixture precipitation
The described nitration mixture circulating tank (5,6) of tank (1,2) lower end base opening connection, the described nitration mixture of described nitration mixture circulating tank (5,6) connection
Descaling bath (7,8) constitutes a circulatory system.
Described two nitration mixture descaling baths (7,8) are serially connected composition, described nitration mixture settling tank (1,2) and acid regeneration list
First (C) is connected using difference in height mode, and described nitration mixture settling tank (1,2) in the connecting pipe of nitration mixture circulating tank (5,6) with going back
It is used for back acid provided with 2 horizontal circulation pumps, described pneumatic diaphragm pump (3,4) side pipe connects an air compression port, described gas
The pipeline reducing diameter of dynamic membrane pump (3,4) inlet pipe is by 65-50mm, and the pipeline reducing diameter of outlet pipe is by 50-65mm.
According to above-mentioned system, the present invention uses a kind of recovery method of steel mixing pickle liquor, and its specific steps is such as
Under：
A. acid filling：Pneumatic diaphragm valve（9,10,11,12）The waste liquid opened in acid filling, acid storage is passed through settling tank（1）Precipitation, is mixed
Sour acid storage（8）In waste liquid be passed through settling tank（2）Precipitation, pneumatic diaphragm valve（13,14,15,16）Open overflow, other valves
Close All, acid filling flow control is in 1.8m/s, and the acid filling time is 20min.
B. alkali is noted：First it is passed through 1.0mol/L's when the acid solution volume in nitration mixture settling tank (1,2) reaches the 70% of tank volume
Hydrogen peroxide solution, account for acid solution volume the 0.9% of hydrogen peroxide solution volume, it is then injected into 4.5mol/L sodium carbonate and 4.0mol/L
The mixed ammonium/alkali solutions regulation pH of sodium hydroxide, pH is between 3.0 for control.
C. precipitate：After to be precipitated dose of addition is finished, the acid solution in mixer stirring 4min, nitration mixture settling tank (1,2) is opened
Temperature maintains 72 DEG C, and the sedimentation time is 200min, precipitation all valves closings during standing.
D. for acid：Precipitate after the completion of process, first open valve（17）It is supplied to acid regeneration unit (C) to enter the acid precipitated
Row treatment for reuse, nitration mixture settling tank（1）Terminate rear nitration mixture settling tank for acid（2）Start for acid, valve（18）Opening will be precipitated
Acid be supplied to acid regeneration unit (C) carry out treatment for reuse, for sour flow velocity be 2m/s, for the sour time be 130min, with gravity from
The mode of stream gives acid regeneration surge tank for acid（26）.
E. blowdown：After terminating for acid, valve（18,17）Close, valve（20,22）Open and start blowdown mud, sludge flow velocity
Control is in 0.3m/s, and blowing time is 14s.
F. acid is returned：After spoil disposal terminates（20,22）Close, valve（19,24）Open, pneumatic diaphragm pump (3,4) pneumatic beginning
Return sour nitration mixture circulating tank（5）, pneumatic diaphragm pump (3,4) outlet pressure maintains 3 × 102KPa, the temperature control of circulating tank is 65
DEG C, it is closing pneumatic diaphragm valve (19,24) after 3m/s, 5min to return sour flow velocity, switches to nitration mixture circulating tank（6）Acid is returned, gas is opened
Dynamic membrane pump (3,4), nitration mixture circulating tank（6）Start back acid, return acid flow velocity for 3m/s, after 5min, all operated pneumatic valves and pump are closed
Close.
Embodiment three
As shown in figure 1, the system involved by the implementation case specifically includes nitration mixture precipitation unit (A) and automatic cycle control process
Unit (B), described nitration mixture precipitation unit (A) is by nitration mixture descaling bath (7,8), nitration mixture settling tank (1,2) and acid regeneration unit (C)
Composition, nitration mixture settling tank (1,2) upper end import described in described nitration mixture descaling bath (7,8) lower end outlet connection, it is middle with every
Film valve is controlled, the connection acid regeneration unit (C) described in described nitration mixture settling tank (1,2) lower end side port, described nitration mixture precipitation
The described nitration mixture circulating tank (5,6) of tank (1,2) lower end base opening connection, the described nitration mixture of described nitration mixture circulating tank (5,6) connection
Descaling bath (7,8) constitutes a circulatory system.
Described two nitration mixture descaling baths (7,8) are serially connected composition, described nitration mixture settling tank (1,2) and acid regeneration list
First (C) is connected using difference in height mode, and described nitration mixture settling tank (1,2) in the connecting pipe of nitration mixture circulating tank (5,6) with going back
It is used for back acid provided with 2 horizontal circulation pumps, described pneumatic diaphragm pump (3,4) side pipe connects an air compression port, described gas
The pipeline reducing diameter of dynamic membrane pump (3,4) inlet pipe is by 65-50mm, and the pipeline reducing diameter of outlet pipe is by 50-65mm.
According to above-mentioned system, the present invention uses a kind of recovery method of steel mixing pickle liquor, and its specific steps is such as
Under：
A. acid filling：Pneumatic diaphragm valve（9,10,11,12）The waste liquid opened in acid filling, acid storage is passed through settling tank（1）Precipitation, is mixed
Sour acid storage（8）In waste liquid be passed through settling tank（2）Precipitation, pneumatic diaphragm valve（13,14,15,16）Open overflow, other valves
Close All, acid filling flow control is in 2m/s, and the acid filling time is 20min.
B. alkali is noted：First it is passed through 0.9mol/L's when the acid solution volume in nitration mixture settling tank (1,2) reaches the 70% of tank volume
Hydrogen peroxide solution, account for acid solution volume the 0.8% of hydrogen peroxide solution volume, it is then injected into 4.0mol/L sodium carbonate and 3.8mol/L
The mixed ammonium/alkali solutions regulation pH of sodium hydroxide, pH is between 2.9 for control.
C. precipitate：After to be precipitated dose of addition is finished, the acid solution in mixer stirring 4min, nitration mixture settling tank (1,2) is opened
Temperature maintains 60 DEG C, and the sedimentation time is 200min, precipitation all valves closings during standing.
D. for acid：Precipitate after the completion of process, first open valve（17）It is supplied to acid regeneration unit (C) to enter the acid precipitated
Row treatment for reuse, nitration mixture settling tank（1）Terminate rear nitration mixture settling tank for acid（2）Start for acid, valve（18）Opening will be precipitated
Acid be supplied to acid regeneration unit (C) carry out treatment for reuse, for sour flow velocity be 1.5m/s, for the sour time be 120min, with gravity
The mode of gravity flow gives acid regeneration surge tank for acid（26）.
E. blowdown：After terminating for acid, valve（18,17）Close, valve（20,22）Open and start blowdown mud, sludge flow velocity
Control is in 0.2m/s, and blowing time is 16s.
F. acid is returned：After spoil disposal terminates（20,22）Close, valve（19,24）Open, pneumatic diaphragm pump (3,4) pneumatic beginning
Return sour nitration mixture circulating tank（5）, pneumatic diaphragm pump (3,4) outlet pressure maintains 3.5 × 102KPa, the temperature control of circulating tank exists
68 DEG C, it is closing pneumatic diaphragm valve (19,24) after 3.5m/s, 5min to return sour flow velocity, switches to nitration mixture circulating tank（6）Acid is returned, is opened
Open pneumatic diaphragm pump (3,4), nitration mixture circulating tank（6）Start back acid, return acid flow velocity for 3.5m/s, after 5min, all operated pneumatic valves
Closed with pump.
In the present invention, purity has been reclaimed by a series of Automated condtrols, control dope sedimentation time, precipitation temperature etc.
More excellent acid solution.Acid solution primes 6m is recycled in embodiment one3, cement content be 0.46ml/L, seconds 2m3, mud contains
Measure as 1.12ml/L；Acid solution primes 6.3m is recycled in embodiment two3, cement content be 0.43ml/L, seconds 1.9m3, mud
Content is 1.02ml/L；Acid solution primes 5.8m is recycled in embodiment three3, cement content be 0.46ml/L, seconds 2.3m3,
Cement content is 1.15ml/L.
Embodiment described above only expresses the preferred embodiment of the present invention, and it describes more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, some deformations can also be made, improves and substitutes, these belong to this hair
Bright protection domain.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (9)
1. a kind of recovery system of steel mixing pickle liquor, it is characterised in that including nitration mixture precipitation unit (A), automatic cycle
Control process unit (B) and acid regeneration unit (C), described nitration mixture precipitation unit (A) include nitration mixture descaling bath (7,8), nitration mixture
Settling tank (1,2), described nitration mixture settling tank (1,2) lower end side port connection acid regeneration unit (C), automatic cycle control process list
First (B) is mainly made up of pneumatic diaphragm pump (3,4) and nitration mixture circulating tank (5,6), described nitration mixture settling tank (1,2) lower end base opening
Described nitration mixture circulating tank (5,6) is connected by conduit, described conduit is used for back provided with the pneumatic diaphragm pump (3,4)
Acid.
2. a kind of recovery system of steel mixing pickle liquor according to claim 1, it is characterised in that described nitration mixture
Descaling bath (7,8) is serially connected composition.
3. a kind of recovery system of steel mixing pickle liquor according to claim 1, it is characterised in that described nitration mixture
Settling tank (1,2) is connected with acid regeneration unit (C) using difference in height mode.
4. a kind of recovery system of steel mixing pickle liquor according to claim 1, it is characterised in that described nitration mixture
Settling tank (1,2) is used for back acid with being additionally provided with 1-2 horizontal circulation pump in the connecting pipe of nitration mixture circulating tank (5,6).
5. the recovery system of a kind of steel mixing pickle liquor according to claim 4, it is characterised in that described is pneumatic
Membrane pump (3,4) side pipe connects an air compression port, the pipeline reducing diameter of described pneumatic diaphragm pump (3,4) inlet pipe by 65-50mm,
The pipeline reducing diameter of outlet pipe is by 50-65mm.
6. based on above recovery system, the present invention uses a kind of recovery method of steel mixing pickle liquor, and its specific steps is such as
Under：
Acid filling：Nitration mixture descaling bath (7,8) inner acid solution is passed into nitration mixture settling tank (1,2), flow control is in 0.8-2.5m/
It is 70-100mm, nitration mixture settling tank that the pipeline nominal diameter in nitration mixture settling tank (1,2) is flowed to below s, nitration mixture descaling bath (7,8)
Diaphragm valve above (1,2) tank skin opens overflow, and other all valves are in closed mode；
Note alkali：First it is passed through 0.5-1.2mol/L hydrogen peroxide solution after the completion of acid filling program, hydrogen peroxide solution volume accounts for acid solution
The 0.5-1% of volume, is then injected into the mixed ammonium/alkali solutions regulation pH of 3.5-5mol/L sodium carbonate and 3-4.5mol/L sodium hydroxides,
PH is controlled between 2.3-3.5；
Precipitation：The acid liquor temperature opened in mixer stirring 3-5min, nitration mixture settling tank (1,2) maintains 65-75 DEG C, during precipitation
Between be 200-400min；
For acid：Nitration mixture settling tank (1,2) and nitration mixture circulating tank (5,6) difference in height are heavy by Valve controlling nitration mixture between 3-6m
Shallow lake tank (1,2), acid regeneration surge tank is given in the way of flow by gravity for acid（26）, flow velocity is 0.8-3m/s；
Blowdown：The pneumatic diaphragm valve blowdown below nitration mixture settling tank (1,2) is opened, sludge flow control is in 0.1-0.5m/s；
Return acid：Spoil disposal valve is closed, and is opened pneumatic diaphragm pump (the 3,4) starting being connected with nitration mixture circulating tank (5,6) and is started back acid,
Pneumatic diaphragm pump (3,4) outlet pressure maintains 2-5 × 102KPa, flow velocity is 2-4m/s, and the temperature control of nitration mixture circulating tank exists
60-70 DEG C, time acid terminates all operated pneumatic valves after the time arrives and pump is closed, and a precipitation cyclic process terminates.
7. the recovery method of a kind of steel mixing pickle liquor according to claim 6, it is characterised in that in stepb,
Hydrogen peroxide solution and alkali carbonate solution are passed through by the conduit of acid regeneration unit (C).
8. the recovery method of a kind of steel mixing pickle liquor according to claim 6, it is characterised in that in step c,
Preferred 70-72 DEG C of acid liquor temperature in nitration mixture settling tank (1,2), sedimentation time preferred 240-300min.
9. the recovery method of a kind of steel mixing pickle liquor according to claim 6, it is characterised in that in step d,
The mode of flow by gravity gives acid regeneration surge tank for acid（26）, flow velocity≤2m/s.
Priority Applications (1)
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| CN109045773A (en) * | 2018-08-20 | 2018-12-21 | 江苏甬金金属科技有限公司 | A kind of acid precipitation process system and processing method |
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| CN109045773A (en) * | 2018-08-20 | 2018-12-21 | 江苏甬金金属科技有限公司 | A kind of acid precipitation process system and processing method |
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Application publication date: 20171020 |