CN104016523B - A kind for the treatment of unit of pickling iron content waste water and treatment process - Google Patents
A kind for the treatment of unit of pickling iron content waste water and treatment process Download PDFInfo
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- CN104016523B CN104016523B CN201410288531.5A CN201410288531A CN104016523B CN 104016523 B CN104016523 B CN 104016523B CN 201410288531 A CN201410288531 A CN 201410288531A CN 104016523 B CN104016523 B CN 104016523B
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Abstract
The invention discloses a kind for the treatment of unit and treatment process of pickling iron content waste water, treatment unit comprise connect successively oil removal equalizing tank, in and aerated reaction pond, accurate adjustment pH neutralization reaction pond and primary sedimentation basin, primary sedimentation basin connects press filtration mummifying pool and secondary sedimentation basins simultaneously respectively; Lay aerating apparatus in described He bottom aerated reaction pond, simultaneously baffle plate be set in bottom, by and aerated reaction pond be divided into the rubble reaction zone near water inlet and the fine stone accumulation area near water outlet; In and aerated reaction pond above be provided with overhead chain conveyer, overhead chain conveyer is hung with some splendid attire Wingdales give charging basket.Utilize the treatment process of this device to be oil removal, in and aeration, accurate adjustment pH, primary sedimentation and secondary sedimentation, in and aeration time, in being sent into by block Wingdale and aerated reaction pond, reaction is more abundant, and sediment is less in batches.
Description
Technical field
The invention belongs to pickling waste waters processing technology field, be specifically related to a kind for the treatment of unit and treatment process of pickling iron content waste water.
Background technology
In the production process of steel product, usually need to carry out cleanup acid treatment with hydrochloric acid to the surface of steel product, to remove the oxide compound on steel product surface.After chlorohydric acid pickling steel product, produce a large amount of pickling waste waterss, these pickling waste waterss can not directly discharge, otherwise pollute the environment, and by process, could must discharge after meeting discharging standards.
The usual method of these iron content pickling wastewater treatments has neutralisation, crystallization process, thermal degradation method, ion exchange method etc.Current process pickling waste waters adopts maximum methods to be neutralisation.Common neutralisation processing technological flow is: equalizing tank, dosing neutralization reaction, precipitation process, filtration treatment, sludge treatment etc.Neutralisation is simple, but there is the problem that sludge quantity is difficult too greatly, processing cost is high, economy is very poor, major cause is the thing that feeds intake because neutralization reaction is common is lime powder or milk of lime, if with lime powder or lime slurry neutralization, feed intake and level of response due to uncontrollable, lime powder or milk of lime can be caused to deposit in a large number, cause the quantity of slag too large, and sediment cannot be recycled, not only cause the wasting of resources, further increase sludge treatment cost.
Adopt Wingdale as the thing that feeds intake, carry out neutralization reaction, effectively can reduce the generation of mud, but what prior art adopted is directly to adding large quantities of lime stone in pickling waste waters, in this kind of method, the chemical reaction of Wingdale and pickling waste waters easily causes reaction insufficient situation because of the accumulation of Wingdale occurs, sediment is still a lot.
Summary of the invention
For the above-mentioned shortcoming that prior art exists, the object of the present invention is to provide a kind for the treatment of unit for the iron content waste water after chlorohydric acid pickling, control the input amount of Wingdale, make Wingdale and pickling waste waters react more complete.
To achieve these goals, the technical solution used in the present invention is:
A treatment unit for pickling iron content waste water, comprise connect successively oil removal equalizing tank, in and aerated reaction pond, accurate adjustment pH neutralization reaction pond and primary sedimentation basin, primary sedimentation basin connects press filtration mummifying pool and secondary sedimentation basins simultaneously respectively;
Lay aerating apparatus in described He bottom aerated reaction pond, simultaneously baffle plate be set in bottom, by and aerated reaction pond be divided into the rubble reaction zone near water inlet and the fine stone accumulation area near water outlet; In and aerated reaction pond above be provided with overhead chain conveyer, overhead chain conveyer is hung with some splendid attire Wingdales give charging basket.
Preferably, in and the water inlet end in aerated reaction pond be provided with floating ball liquid level control valve.
Preferably, in and the water outlet end in aerated reaction pond be provided with filter screen.
Preferably, described aerating apparatus is the compressed air pipe in snakelike sigmoid, bottom during compressed air pipe is fixed on by fixation clip and aerated reaction pond; Compressed air pipe is evenly distributed with solarization air cap.
Preferably, in fine stone accumulation area place and aerated reaction pond is at the bottom of inclination pond, and water inlet end position is higher than water outlet end position, and inclination angle is 10 ° ~ 20 °.
Preferably, the distance of baffle plate and water inlet end pool wall is greater than one to the width of charging basket.
The present invention also provides a kind for the treatment of process of the pickling iron content waste water utilizing the treatment unit of above-mentioned pickling iron content waste water, and concrete technical scheme is:
A treatment process for pickling iron content waste water, comprises the following steps:
(A) acid waste water of iron content is left standstill in oil removal equalizing tank, oil slick and scum silica frost in isolation, removing water;
(B) waste water is taken out from the lower floor of oil removal equalizing tank, in entering and aerated reaction pond, by overhead chain conveyer, by splendid attire Wingdale give charging basket successively from and aerated reaction pond immerse in waste water near water outlet one end, advance along flow reversal under the effect of overhead chain conveyer to charging basket; When near water inlet one end, the Wingdale given in charging basket is poured over the rubble reaction zone of water inlet end; Carry out in the process of neutralization reaction at Wingdale and waste water, by the continuous aeration of the aerating apparatus at the bottom of pond, form ironic hydroxide suspension liquid, discharge from water outlet, the pH value of water outlet controls 1 ~ 4;
(C) from and aerated reaction pond flow out ironic hydroxide suspension liquid introduce accurate adjustment pH neutralization reaction pond, add sodium hydroxide solution, and use stirrer Keep agitation, pH value is adjusted to 6 ~ 9;
(D) again ironic hydroxide suspension liquid is sent into primary sedimentation basin, by unhurried current, leave standstill, make ironic hydroxide form natural sedimentation;
(E) supernatant liquid of primary sedimentation basin is sent into secondary sedimentation basins, then through flowing slowly, leaving standstill, ironic hydroxide is precipitated further, the supernatant liquid rear direct discharge up to standard after unhurried current leaves standstill;
(F) the lower floor's ferric hydroxide precipitate in primary sedimentation basin sends into press filtration mummifying pool, and carry out press filtration by plate basket pressure filter, the ironic hydroxide after press filtration is through natural mummification, recovery.
Preferably, in step (B), the particle diameter of the Wingdale added is 100 ~ 500mm.
Preferably, in step (E), the lower floor's ferric hydroxide precipitate after being left standstill by unhurried current in secondary sedimentation basins is sent back in primary sedimentation basin by water pump.
Preferably, in step (F), after ferric hydroxide precipitate press filtration drying and other treatment, filtrate and the draining of generation are sent back in primary sedimentation basin by water pump.
Owing to have employed technique scheme, the invention has the beneficial effects as follows:
1) first by overhead chain conveyer by the mode that adds of Wingdale substep, the acidic solution in Wingdale and waste water is made to react more abundant, excessive calcium carbonate impurity can be avoided to be mixed in ironic hydroxide suspension liquid, to substantially increase the purity of final product ironic hydroxide; And decrease the accumulation of Wingdale sediment, effectively saved resource, decrease the processing cost of mud simultaneously.
2) Wingdale moves to strong acid district to charging basket from the weak acid district that acidity is more weak, and sails against the current, and by counter-current principle, makes the reaction of Wingdale and pickling waste waters more abundant.
3) Wingdale adopts particle diameter 100 ~ 500mm, increase the gap between Wingdale, be convenient to gas easily pass through, the turbulent flow that increase gas itself and gas disturbance cause washes away dynamics to the ironic hydroxide cavernous body precipitation that limestone surfaces produces, solves the flowability problem of ferric hydroxide precipitate between Wingdale.
Accompanying drawing explanation
Fig. 1 is process flow schematic diagram of the present invention.
Fig. 2 be of the present invention in and aerated reaction pond schematic diagram.
Fig. 3 is aerating apparatus schematic diagram of the present invention.
Mark in figure: 1-oil removal equalizing tank, in 2-and aerated reaction pond, 21-overhead chain conveyer, 22-is to charging basket, 23-water inlet, 231-floating ball liquid level control valve, 24-water outlet, 241-filter screen, 25-aerating apparatus, 251-compressed air pipe, 252-fixation clip, 253-solarization air cap, 26-baffle plate, 2a-rubble reaction zone, 2b-fine stone accumulation area, 3-accurate adjustment pH neutralization reaction pond, 4-primary sedimentation basin, 5-press filtration mummifying pool, 6-secondary sedimentation basins.
Embodiment
Below in conjunction with accompanying drawing, the enforcement for the treatment of unit of the present invention is illustrated:
With reference to Fig. 1, the treatment unit of pickling iron content waste water of the present invention, comprise connect successively oil removal equalizing tank 1, in and aerated reaction pond 2, accurate adjustment pH neutralization reaction pond 3 and primary sedimentation basin 4, primary sedimentation basin 4 connects press filtration mummifying pool 5 and secondary sedimentation basins 6 simultaneously respectively.
With reference to Fig. 2, in and lay aerating apparatus 25 bottom aerated reaction pond 2, baffle plate 26 is set in bottom simultaneously, by and aerated reaction pond 2 be divided into the rubble reaction zone 2a near the water inlet 23 and fine stone accumulation area 2b near water outlet 24.Baffle plate 26 highly about 300mm, baffle plate 26 positional distance water inlet 23 end pool wall gives charging basket 22 slightly wide than one, this design is that tiny Wingdale is involved in fine stone accumulation area 2b by the turbulent flow formed in order to avoid water inlet 23.
In fine stone accumulation area 2b place and aerated reaction pond 2 is at the bottom of inclination pond, water inlet 23 end position is higher than water outlet 24 end position, inclination angle is 10 ° ~ 20 °, is convenient to ironic hydroxide suspension liquid and can flows to water outlet 24 end from water inlet 23 end and be unlikely to produce alluvial in inlet end.After producing for some time, have some Wingdales be scattered at fine stone accumulation area 2b, owing to being in the weak acid district of water outlet 24 end, Wingdale speed of response is extremely slow, pond operation clearly should be carried out as piled up many, the Wingdale that is scattered of water side is drawn clearly in the rubble reaction zone 2a of water-in 23 end.Water outlet 24 drive water side pool wall from bottom about 500mm place, and the filter screen 241 that aperture is 5mm is set, avoids the limestone particle be scattered to flow out with ironic hydroxide suspension liquid.
In and water inlet 23 end in aerated reaction pond 2 be provided with floating ball liquid level control valve 231, when in pond during liquid level step-down, automatically open switch, enlargement discharge; When liquid level meets the requirements, automatically close water inlet 23 by floating ball liquid level control valve 231, play a kind of effect of automatic adjustment.
In and aerated reaction pond 2 above be provided with the gravity system be made up of to charging basket 22 and overhead chain conveyer 21 lime.Be common cubes storage cage to charging basket 22, size specification is determined according to unit time treatment capacity, and basket selects resistance to acid attack material, basket grid is 10-30mm, one switching arrangement is set bottom basket, when arriving water inlet 23 end to charging basket 22, rubble in basket is poured over rubble reaction zone 2a.Overhead chain conveyer 21 is for giving the automatic transmission of charging basket 22, and overhead chain conveyer 21 adopts circular trackway, and above during a siding track is in and aerated reaction pond 2, opposite side track is in Wingdale raw ore dress basket feeding area, can artificial loading.Utilize overhead chain conveyer 21, by in the feeding of one basket one basket, Wingdale and aerated reaction pond 2, and can enter from water outlet 24 one end, Wingdale is poured in water inlet 23 one end, Wingdale submerges in the process of movement in pond, the counter-current principle adopted, makes the reaction of Wingdale and pickling waste waters more abundant.
With reference to Fig. 2, Fig. 3, aerating apparatus 25 be the compressed air pipe 251 in snakelike sigmoid, compressed air pipe 251 tube spacing 100-150mm back and forth, the size of caliber according in set with the size in aerated reaction pond 2.Bottom during compressed air pipe 251 is fixed on by fixation clip 252 and aerated reaction pond 2; Compressed air pipe 251 is evenly distributed with solarization air cap 253.Aerating apparatus 25 of the present invention not only provides oxygen for carrying out oxidizing reaction, also utilizes the pressurized air of large discharge to form turbulent flow, and the ferrous hydroxide that disturbance generates and ferric hydroxide precipitate, avoid sediment.Pressurized air coil pipe is directly holed, and solarization air cap 253 aperture is 0.5mm, solarization air cap 253 spacing 50mm.Because solarization air cap 253 aperture is large, increase the disturbance dynamics of turbulent flow during aeration, saved the cost purchasing aeration head.The pressurized air that aerating apparatus 25 can directly adopt factory's existing pressurized air central gas supply station to provide is as source of the gas, compressed-air actuated operate pressure is 0.4 ~ 0.8MPa, because large-scale compressed air station is lower than the unit air feed cost of independent air compressor machine, save running cost.
In and 2 li, aerated reaction pond occur main chemical reactions formula be:
①CaCO
3+2H
+→CO
2↑+H
2O+Ca
2+；
②Fe
2++2OH
-→Fe(OH)
2↓；
③4Fe(OH)
2+2H
2O+O
2→4Fe(OH)
3↓；
④4Fe
2++10H
2O+O
2→4Fe(OH)
3↓+8H
+；
Above chemical reaction be in and aerated reaction pond 2 occur main chemical reactions, from water inlet 23 send into pickling waste waters mainly comprise Fe
2+and H
+, add Wingdale (CaCO
3) after, pass through Fe
2+and CO
3 2-hydrolysis, 1. and 2. there is chemical reaction, more constantly pass into after air through aerating apparatus 25 and chemical reaction occurs 3., generate with Fe (OH)
3the suspension liquid of precipitation, is also attended by chemical reaction generation 4., the H of generation simultaneously and in aerated reaction pond 2
+return chemical reaction 1. in and Wingdale (CaCO
3) reaction.Circulation like this, by constantly adding Wingdale (CaCO
3) constantly can consume Fe in pickling waste waters
2+and H
+, finally discharge Fe (OH) from water outlet 24
3suspension liquid, and be mainly CaCl
2solution.
With reference to Fig. 1, Fig. 2, illustrate the enforcement for the treatment of process of the present invention, concrete steps are as follows:
Embodiment 1:
(A) left standstill in oil removal equalizing tank 1 by the acid waste water of iron content, oil slick and scum silica frost in isolation, removing water, in pickling waste waters, concentration of hydrochloric acid is 2%.
(B) open water inlet 23 valve toward in inject pickling waste waters with aerated reaction pond 2, and open aerating apparatus 25 and carry out aeration.The Wingdale (or other calcium carbonate raw ores) particle diameter being approximately 100mm be placed in hang carriage in charging basket 22, successively from and aerated reaction pond 2 immerse in waste water near water outlet 24 end, advance along flow reversal under the effect of overhead chain conveyer 21 to charging basket 22.For avoiding ironic hydroxide to deposit, as long as leave suspension liquid in reaction tank, aeration just can not stop.
When near water inlet 23 end, open to charging basket 22 bottom switch, the Wingdale given in charging basket 22 is poured over the rubble reaction zone 2a of water inlet 23 end, to charging basket 22 along the circulation filling of overhead chain conveyer 21 auto-returned charging limestone place.
Automatically flooding velocity can be controlled at the floating ball liquid level control valve 231 of water inlet 23.And level of response can be controlled by the water flow adjusting the mouth of a river 24, check with wide pH value test paper, the pH value making water outlet 24 place suspension liquid is 2.
(C) from and aerated reaction pond 2 flow out ironic hydroxide suspension liquid introduce accurate adjustment pH neutralization reaction pond 3, add sodium hydroxide solution, and use stirrer Keep agitation, pH value is adjusted to 6.
(D) again ironic hydroxide suspension liquid is sent into primary sedimentation basin 4, by unhurried current, leave standstill, make ironic hydroxide form natural sedimentation.
(E) supernatant liquid of primary sedimentation basin 4 is sent into secondary sedimentation basins 6, then through flowing slowly, leaving standstill, ironic hydroxide is precipitated further, the supernatant liquid rear direct discharge up to standard after unhurried current leaves standstill; Lower floor's ferric hydroxide precipitate after being left standstill by unhurried current in secondary sedimentation basins 6 is sent back in primary sedimentation basin 4 by water pump.
(F) the lower floor's ferric hydroxide precipitate in primary sedimentation basin 4 sends into press filtration mummifying pool 5, and carry out press filtration by plate basket pressure filter, the ironic hydroxide after press filtration is through natural mummification, recovery.Ironic hydroxide pack after mummification, can directly be used as the starting material manufacturing red iron oxide, steel mill also can be sent to carry out smelting or do other purposes.After ferric hydroxide precipitate press filtration drying and other treatment, the filtrate of generation and draining are sent back in primary sedimentation basin 4 by water pump.
Embodiment 2:
(A) left standstill in oil removal equalizing tank 1 by the acid waste water of iron content, oil slick and scum silica frost in isolation, removing water, in pickling waste waters, concentration of hydrochloric acid is 4%.
(B) open water inlet 23 valve toward in inject pickling waste waters with aerated reaction pond 2, and open aerating apparatus 25 and carry out aeration.The Wingdale (or other calcium carbonate raw ores) particle diameter being approximately 300mm be placed in hang carriage in charging basket 22, successively from and aerated reaction pond 2 immerse in waste water near water outlet 24 end, advance along flow reversal under the effect of overhead chain conveyer 21 to charging basket 22.For avoiding ironic hydroxide to deposit, as long as leave suspension liquid in reaction tank, aeration just can not stop.
When near water inlet 23 end, open to charging basket 22 bottom switch, the Wingdale given in charging basket 22 is poured over the rubble reaction zone 2a of water inlet 23 end, to charging basket 22 along the circulation filling of overhead chain conveyer 21 auto-returned charging limestone place.
Automatically flooding velocity can be controlled at the floating ball liquid level control valve 231 of water inlet 23.And level of response can be controlled by the water flow adjusting the mouth of a river 24, check with wide pH value test paper, the pH value making water outlet 24 place suspension liquid is 4.
(C) from and aerated reaction pond 2 flow out ironic hydroxide suspension liquid introduce accurate adjustment pH neutralization reaction pond 3, add sodium hydroxide solution, and use stirrer Keep agitation, pH value is adjusted to 9.
(D) again ironic hydroxide suspension liquid is sent into primary sedimentation basin 4, by unhurried current, leave standstill, make ironic hydroxide form natural sedimentation.
(E) supernatant liquid of primary sedimentation basin 4 is sent into secondary sedimentation basins 6, then through flowing slowly, leaving standstill, ironic hydroxide is precipitated further, the supernatant liquid rear direct discharge up to standard after unhurried current leaves standstill; Lower floor's ferric hydroxide precipitate after being left standstill by unhurried current in secondary sedimentation basins 6 is sent back in primary sedimentation basin 4 by water pump.
(F) the lower floor's ferric hydroxide precipitate in primary sedimentation basin 4 sends into press filtration mummifying pool 5, and carry out press filtration by plate basket pressure filter, the ironic hydroxide after press filtration is through natural mummification, recovery.Ironic hydroxide pack after mummification, can directly be used as the starting material manufacturing red iron oxide, steel mill also can be sent to carry out smelting or do other purposes.After ferric hydroxide precipitate press filtration drying and other treatment, the filtrate of generation and draining are sent back in primary sedimentation basin 4 by water pump.
Embodiment 3:
(A) left standstill in oil removal equalizing tank 1 by the acid waste water of iron content, oil slick and scum silica frost in isolation, removing water, in pickling waste waters, concentration of hydrochloric acid is 4%.
(B) open water inlet 23 valve toward in inject pickling waste waters with aerated reaction pond 2, and open aerating apparatus 25 and carry out aeration.The Wingdale (or other calcium carbonate raw ores) particle diameter being approximately 500mm be placed in hang carriage in charging basket 22, successively from and aerated reaction pond 2 immerse in waste water near water outlet 24 end, advance along flow reversal under the effect of overhead chain conveyer 21 to charging basket 22.For avoiding ironic hydroxide to deposit, as long as leave suspension liquid in reaction tank, aeration just can not stop.
When near water inlet 23 end, open to charging basket 22 bottom switch, the Wingdale given in charging basket 22 is poured over the rubble reaction zone 2a of water inlet 23 end, to charging basket 22 along the circulation filling of overhead chain conveyer 21 auto-returned charging limestone place.
Automatically flooding velocity can be controlled at the floating ball liquid level control valve 231 of water inlet 23.And level of response can be controlled by the water flow adjusting the mouth of a river 24, check with wide pH value test paper, the pH value making water outlet 24 place suspension liquid is 1.
(C) from and aerated reaction pond 2 flow out ironic hydroxide suspension liquid introduce accurate adjustment pH neutralization reaction pond 3, add sodium hydroxide solution, and use stirrer Keep agitation, pH value is adjusted to 9.
(D) again ironic hydroxide suspension liquid is sent into primary sedimentation basin 4, by unhurried current, leave standstill, make ironic hydroxide form natural sedimentation.
(E) supernatant liquid of primary sedimentation basin 4 is sent into secondary sedimentation basins 6, then through flowing slowly, leaving standstill, ironic hydroxide is precipitated further, the supernatant liquid rear direct discharge up to standard after unhurried current leaves standstill; Lower floor's ferric hydroxide precipitate after being left standstill by unhurried current in secondary sedimentation basins 6 is sent back in primary sedimentation basin 4 by water pump.
(F) the lower floor's ferric hydroxide precipitate in primary sedimentation basin 4 sends into press filtration mummifying pool 5, and carry out press filtration by plate basket pressure filter, the ironic hydroxide after press filtration is through natural mummification, recovery.Ironic hydroxide pack after mummification, can directly be used as the starting material manufacturing red iron oxide, steel mill also can be sent to carry out smelting or do other purposes.After ferric hydroxide precipitate press filtration drying and other treatment, the filtrate of generation and draining are sent back in primary sedimentation basin 4 by water pump.
In the present invention, the Wingdale that fine stone accumulation area 2b is scattered in region is through after a period of time, can clear up and enter rubble reaction zone 2a and again fully react, but Wingdale raw ore itself is containing a small amount of silicate impurity, because its density is larger, the overwhelming majority can not flow out with ironic hydroxide suspension liquid, ensure that the purity of ironic hydroxide product.So final waste residue of the present invention is silicate, quality is about the 1-3% of Wingdale raw ore, and because this waste residue is not containing the material that exceeds standard of statutory emissions regulations, environmental sound, may be used for cultivating flowers and plants, reach the zero release of pollutent.
Claims (10)
1. the treatment unit of a pickling iron content waste water, comprise successively connect oil removal equalizing tank (1), in and aerated reaction pond (2), accurate adjustment pH neutralization reaction pond (3) and primary sedimentation basin (4), primary sedimentation basin (4) connects press filtration mummifying pool (5) and secondary sedimentation basins (6) simultaneously respectively, it is characterized in that
Aerating apparatus (25) is laid in bottom, in described and aerated reaction pond (2), simultaneously baffle plate (26) is set in bottom, will in and aerated reaction pond (2) be divided into the rubble reaction zone (2a) near water inlet (23) and the fine stone accumulation area (2b) near water outlet (24); In and aerated reaction pond (2) top be provided with overhead chain conveyer (21), overhead chain conveyer (21) is hung with some splendid attire Wingdales give charging basket (22).
2. treatment unit according to claim 1, is characterized in that, in and aerated reaction pond (2) water inlet (23) end be provided with floating ball liquid level control valve (231).
3. treatment unit according to claim 1, is characterized in that, in and aerated reaction pond (2) water outlet (24) end be provided with filter screen (241).
4. treatment unit according to claim 1, it is characterized in that, described aerating apparatus (25) is the compressed air pipe (251) in snakelike sigmoid, bottom, during compressed air pipe (251) is fixed on by fixation clip (252) and aerated reaction pond (2); Compressed air pipe (251) is evenly distributed with solarization air cap (253).
5. treatment unit according to claim 1, it is characterized in that, in fine stone accumulation area (2b) place and aerated reaction pond (2) is at the bottom of inclination pond, water inlet (23) end position is higher than water outlet (24) end position, and inclination angle is 10 ° ~ 20 °.
6. treatment unit according to claim 1, is characterized in that, baffle plate (26) and water inlet (23) hold the distance of pool wall to be greater than one to the width of charging basket (22).
7. a treatment process for pickling iron content waste water, is characterized in that, comprises the following steps:
(A) acid waste water of iron content is left standstill in oil removal equalizing tank (1), oil slick and scum silica frost in isolation, removing water;
(B) waste water is taken out from the lower floor of oil removal equalizing tank (1), in entering and aerated reaction pond (2), by overhead chain conveyer (21), by splendid attire Wingdale give charging basket (22) successively from and aerated reaction pond (2) immerse in waste water near water outlet (24) one end, advance along flow reversal under the effect of overhead chain conveyer (21) to charging basket (22); When near water inlet (23) one end, the rubble reaction zone of water inlet (23) one end will be poured over to the Wingdale in charging basket (22); Carry out in the process of chemical reaction at Wingdale and waste water, by the constantly aeration of the aerating apparatus (25) at the bottom of pond, form ironic hydroxide suspension liquid, discharge from water outlet (24), the pH value of water outlet (24) controls 1 ~ 4;
(C) from and the ironic hydroxide suspension liquid that flows out of aerated reaction pond (2) introduce accurate adjustment pH neutralization reaction pond (3), add sodium hydroxide solution, and use stirrer Keep agitation, pH value is adjusted to 6 ~ 9;
(D) again ironic hydroxide suspension liquid is sent into primary sedimentation basin (4), by unhurried current, leave standstill, make ironic hydroxide form natural sedimentation;
(E) supernatant liquid of primary sedimentation basin (4) is sent into secondary sedimentation basins (6), then through flowing slowly, leaving standstill, ironic hydroxide is precipitated further, the supernatant liquid rear direct discharge up to standard after unhurried current leaves standstill;
(F) the lower floor's ferric hydroxide precipitate in primary sedimentation basin (4) sends into press filtration mummifying pool (5), and carry out press filtration by plate basket pressure filter, the ironic hydroxide after press filtration is through natural mummification, recovery.
8. treatment process according to claim 7, is characterized in that, in step (B), the particle diameter of the Wingdale added is 100 ~ 500mm.
9. treatment process according to claim 7, is characterized in that, in step (E), the lower floor's ferric hydroxide precipitate after being left standstill by unhurried current in secondary sedimentation basins (6) is sent back in primary sedimentation basin (4) by water pump.
10. treatment process according to claim 7, is characterized in that, in step (F), after ferric hydroxide precipitate press filtration drying and other treatment, the filtrate of generation and draining are sent back in primary sedimentation basin (4) by water pump.
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| CN106745979A (en) * | 2016-12-15 | 2017-05-31 | 攀枝花钢城集团有限公司 | Strontium ferrite powder process for treating acidic waste water |
| CN108328796A (en) * | 2018-02-27 | 2018-07-27 | 齐鲁工业大学 | The batch process and reclamation set and method of a kind of zinc-plated pickling waste waters |
| CN112811674A (en) * | 2021-02-05 | 2021-05-18 | 武文青 | Pickling wastewater neutralization treatment device for hot-rolled nickel-based alloy stainless steel medium plate |
| CN114988483A (en) * | 2022-05-13 | 2022-09-02 | 贵州明俊雅正生态环境科技有限公司 | System and method for preparing iron oxide red pigment by using acidic iron-containing wastewater |
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