CN106809989B - A kind of method of semi-dry process flue gas desulphurization ash processing vanadium industrial wastewater - Google Patents
A kind of method of semi-dry process flue gas desulphurization ash processing vanadium industrial wastewater Download PDFInfo
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G37/00—Compounds of chromium
- C01G37/02—Oxides or hydrates thereof
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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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
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
A kind of method of semi-dry process flue gas desulphurization ash processing vanadium industrial wastewater, sequentially includes the following steps: (1) for vanadium industrial wastewater and semi-dry process flue gas desulphurization ash is added；(2) inorganic acid for adjusting pH value is added and stirs；(3) settle and separate goes out supernatant and sediment, and sediment obtains calcium sulfate, filtrate and supernatant mixing through filters pressing；(4) sodium hydroxide is added and stirs, flocculant is then added and continues to stir；(5) settle and separate goes out supernatant and sediment, and sediment forms mud containing chrome green, filtrate and supernatant mixing through filters pressing；(6) Ammonia Nitrogen Precipitation from Simulated pond is introduced, magnesium salts and phosphate are stirred and be added, pH value is adjusted and then stirs；(7) settle and separate goes out supernatant and sediment.The present invention realizes the resource utilization of semi-dry desulphurization solid waste, reduces cost for wastewater treatment, also solves the problems, such as the secondary pollution of semi-dry desulphurization ash and land occupation, environmental benefit, economic benefit and social benefit with higher.
Description
Technical field
The invention belongs to waste water and fixed-end forces technical field, and in particular to a kind of semi-dry process flue gas desulphurization ash processing vanadium work
The method of industry waste water.
Background technique
Vanadium has the title of metal " vitamin ", is widely used in the industries such as metallurgy, chemical industry, is used as alloy addition and organic chemical industry
Catalyst etc.；Currently, its major product technique for producing vanadium pentoxide is mostly sodium roasting technique, the technique main flow
Are as follows: vanadium slag is crushed-sodium roasting-water logging vanadium extraction-purification of leaching liquor-acid ammonium salt vanadium-fusing；The technique generates a large amount of high pollutions
Acid waste water, feature is that salinity is high, discharge amount is big, content of beary metal is higher, according to " GB 26452-2011 vanadium industrial pollution
Object discharge standard " it requires, the total Chromium in Waste, Cr VI, total vanadium and ammonia nitrogen severely exceed (CTCr=3500-4500mg/L；CCr 6 +=3300-3800mg/L；CV 5+=50-200mg/L；CNH3-N=2800-4000mg/L)；Currently, the processing side that such waste water is common
Method has evaporation concentration method crystallisation, reduction neutralization precipitation method, ion-exchange, electrolytic reduction, adsorption treatment method, liquid film separation
Method etc..Though these methods have certain effect, in the prevalence of processing cost is high, treatment effeciency is low, is also easy to produce secondary pollution
With cannot complete qualified discharge the problems such as.
Summary of the invention
For the above problem existing for existing vanadium technology for treating industrial waste water, the present invention provides a kind of semi-dry process flue gas desulphurization
The method of ash processing vanadium industrial wastewater digests manufactured calcium hydroxide slurry as in desulfurizing agent, with flue gas using pulverized limestone
Sulfur dioxide reacts, and using the moisture in obvious heat of smoke evaporation slurries, generates the desulfurizing byproduct of dry powder-shaped.
Method of the invention sequentially includes the following steps:
1, vanadium industrial wastewater is introduced into reduction reaction pond, stir and semi-dry process flue gas desulphurization ash is added；Semidry method flue gas is de-
The additional amount of sulphur ash is 5 ~ 10 times of vanadium and chromium gross mass in vanadium industrial wastewater；
2, pH=1.0 ~ 3.0 that inorganic acid adjusts whole materials in reduction reaction pond are added, then react under agitation
The vanadium of high-valence state and chromium are reduced to lower valency by 10 ~ 30min；
3, at least 0.5h is staticly settled after the reaction was completed, isolates a supernatant and primary sedimentation object, primary sedimentation object
Reduction byproduct calcium sulfate is obtained through a filter-press dehydration, the first-time filtrate and a supernatant mixing that a filter-press dehydration obtains
Form mixed once liquid；
4, mixed once liquid is introduced into neutralization precipitation pond, sodium hydroxide is added and adjusts pH=6.5 ~ 9.0, it is stirred to react 10 ~
Then flocculant is added in 30min, form alumen ustum in neutralization precipitation pond, continues 5 ~ 10min of stirring；The flocculant is poly-
Acrylamide, aluminium polychloride or bodied ferric sulfate, additional amount by concentration of the flocculant in mixed once liquid be 10 ~
100ppm；
5,0.5 ~ 3h is staticly settled, secondary supernatant and secondary precipitate are isolated, secondary precipitate is de- through secondary filters pressing
Water forms mud containing chrome green, and the secondary filtrate and secondary supernatant that secondary filter-press dehydration obtains are mixed to form secondary mixed liquor；
6, secondary mixed liquor is introduced into Ammonia Nitrogen Precipitation from Simulated pond, stirs and be added magnesium salts, after magnesium salts all dissolution, stirred and add
Enter phosphate, adds sodium hydroxide and adjust pH=9.0 ~ 10.0, be then stirred to react 10 ~ 30min, make in secondary mixed liquor
Ammonia nitrogen forms magnesium ammonium phosphate sediment；The magnesium salts is magnesium chloride, magnesium sulfate or magnesia, and additional amount is ammonia by the mole of magnesium
1.0 ~ 1.5 times of nitrogen mole；The phosphate is sodium dihydrogen phosphate, disodium hydrogen phosphate or tertiary sodium phosphate, and additional amount presses phosphorus
Mole be 0.9 ~ 1.4 times of ammonia nitrogen mole；
7,20 ~ 50min is stood, isolates supernatant three times and three times sediment, sediment is through filter-press dehydration three times three times
Obtain ammonium magnesium phosphate；Three times filter-press dehydration obtain filtrate three times and three times supernatant as processed waste water.
Total chromium concn < 1.5mg/L, hexavalent chromium concentration < 0.5mg/L, pentavalent vanadium concentration < in the processed waste water
1.0mg/L, NH3-N concentration < 200mg/L, total phosphorus concentration < 15mg/L.
PH=1 ~ 3 of the vanadium industrial wastewater, total 3500 ~ 4500 mg/L of chromium concn, hexavalent chromium concentration 3300 ~
3800mg/L, pentavalent vanadium 50 ~ 200mg/L of concentration, ammonia nitrogen (NH3- N) 2800 ~ 4000mg/L of concentration.
The inorganic acid is sulfuric acid, hydrochloric acid or nitric acid.
The harmless treatment of vanadium industrial wastewater is realized using semi-dry process flue gas desulphurization ash, and water outlet heavy metal contaminants reach state
Family standard GB 26452-2011, and ammonia nitrogen and phosphorus significantly reduce (CNH3-N< 200mg/L, CTP< 15mg/L), it can be with life
Sewage mixed processing；Wherein reduction reaction pond generate sediment is washed, calcium sulfate can be obtained after filter-press dehydration, is produced from neutralization precipitation pond
Primary chromium hydroxide (chromium content is about 54% in terms of Cr2O3 after dry) can be obtained in raw sediment after being dehydrated, and chromium content is higher,
Can further resource utilization, turn waste into wealth；It is phosphoric acid that main component, which can be obtained, in the sediment that Ammonia Nitrogen Precipitation from Simulated pond generates after being dehydrated
The white precipitate of ammonium magnesium can be used as the raw material of production slow-release fertilizer, economic value with higher.
The present invention realizes the resource utilization of semi-dry desulphurization solid waste, both reduces cost for wastewater treatment,
Solve the problems, such as the secondary pollution of semi-dry desulphurization ash and land occupation, being even more for smelting iron and steel enterprise can be by waste water treatment and cigarette
Gas improvement combines, and realization is marketed one's own products, the treatment of wastes with processes of wastes against one another, environmental benefit, economic benefit and social benefit with higher；With
Prior art is compared, and high treating effect of the present invention, process is short, and processing speed is fast, low in cost, can be applied with existing equipment,
Without increasing capital cost.
Detailed description of the invention
Fig. 1 is the method flow schematic diagram that semi-dry process flue gas desulphurization ash of the invention handles vanadium industrial wastewater；
Fig. 2 is the semi-dry process flue gas desulphurization ash XRD diagram used in the embodiment of the present invention；
Fig. 3 is XRD diagram of the calcium sulfate of the acquisition of the embodiment of the present invention 1 after drying；
Fig. 4 is XRD diagram of the ammonium magnesium phosphate of the acquisition of the embodiment of the present invention 1 after drying.
Specific embodiment
50 ~ 100 DEG C of leaving water temperature of vanadium industrial wastewater (waste water) used in the embodiment of the present invention, quantum of output be 500 ~
900t/d。
The semi-dry process flue gas desulphurization grey (semi-dry desulphurization ash) used in the embodiment of the present invention is de- for half dry type calcium method flue gas
Sulphur ash.
Semi-dry desulphurization ash in the embodiment of the present invention contains S 14.2%, CaO 46.09%, MgO by weight percentage
1.46%, TFe 0.24%, Cl 1.50%, Al2O30.22%, SiO2 0.94%。
Sulfuric acid, hydrochloric acid and the nitric acid used in the embodiment of the present invention is commercially available technical grade product.
The polyacrylamide that uses in the embodiment of the present invention, aluminium polychloride, bodied ferric sulfate is commercially available technical grade products.
Magnesium chloride, magnesium sulfate and the magnesia used in the embodiment of the present invention is commercially available technical grade product.
Sodium dihydrogen phosphate, disodium hydrogen phosphate and the tertiary sodium phosphate used in the embodiment of the present invention is commercially available technical grade product.
In method of the invention, step 2 optimal pH is 2.0 ~ 3.0.
In method of the invention, step 4 optimal pH is 7.0 ~ 8.5.
In method of the invention, step 6 optimal pH is 8.5 ~ 10.0.
The following are preferably specific implementation cases of the invention, but scope of protection of the present invention is not limited thereto, any ripe
Know those skilled in the art within the technical scope of the present disclosure, according to the technique and scheme of the present invention and its invention structure
Think of is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
The vanadium industrial wastewater used in the embodiment of the present invention is the vanadium industrial wastewater of Hebei factory or Heilungkiang factory.
Embodiment 1
PH=1 of vanadium industrial wastewater, total 4500 mg/L of chromium concn, hexavalent chromium concentration 3800mg/L, pentavalent vanadium concentration
200mg/L, ammonia nitrogen (NH3- N) concentration 4000mg/L；Vanadium industrial wastewater is introduced into reduction reaction pond, stirs and semidry method cigarette is added
Desulfurization ash；The additional amount of semi-dry process flue gas desulphurization ash is 10 times of vanadium and chromium gross mass in vanadium industrial wastewater；Semidry method flue gas
Desulphurization XRD diagram is as shown in Figure 2；
PH=1.0 that inorganic acid adjusts whole materials in reduction reaction pond are added, then reduction reaction under agitation
The vanadium of high-valence state and chromium are reduced to lower valency by 30min；The inorganic acid is sulfuric acid；
2h is staticly settled after the completion of reduction reaction, isolates a supernatant and primary sedimentation object, primary sedimentation object is through one
Secondary filter-press dehydration obtains reduction byproduct calcium sulfate, and the first-time filtrate and a supernatant that a filter-press dehydration obtains are mixed to form
Mixed once liquid；XRD diagram of the calcium sulfate after drying is as shown in Figure 3；
Mixed once liquid is introduced into neutralization precipitation pond, sodium hydroxide is added and adjusts pH=6.5, is stirred to react 30min, then
Flocculant is added, forms alumen ustum in neutralization precipitation pond, continues to stir 10min；The flocculant is polyacrylamide, is added
Amount is 100ppm by concentration of the flocculant in mixed once liquid；
0.5h is staticly settled, isolates secondary supernatant and secondary precipitate, secondary precipitate is through secondary filter-press dehydration shape
At mud containing chrome green, the secondary filtrate and secondary supernatant that secondary filter-press dehydration obtains are mixed to form secondary mixed liquor；
Secondary mixed liquor is introduced into Ammonia Nitrogen Precipitation from Simulated pond, stirs and be added magnesium salts, after magnesium salts all dissolution, stirs and is added
Phosphate adds sodium hydroxide and adjusts pH=9.0, is then stirred to react 0min, and the ammonia nitrogen in secondary mixed liquor is made to form phosphoric acid
Ammonium magnesium precipitate；The magnesium salts is magnesium chloride, and additional amount is by 1.5 times that the mole of magnesium is ammonia nitrogen mole；The phosphoric acid
Salt is sodium dihydrogen phosphate, and additional amount is by 1.3 times that the mole of phosphorus is ammonia nitrogen mole；
20min is stood, supernatant three times and three times sediment are isolated, sediment obtains phosphorus through filter-press dehydration three times three times
Sour ammonium magnesium；XRD diagram of the ammonium magnesium phosphate after drying is as shown in Figure 4；Three times filter-press dehydration obtain filtrate three times and three times on
Clear liquid as processed waste water, total chromium concn < 1.5mg/L, hexavalent chromium concentration < 0.5mg/L, pentavalent vanadium concentration < 1.0mg/L,
NH3-N concentration < 200mg/L, total phosphorus concentration < 15mg/L.
Embodiment 2
With embodiment 1, difference is method:
(1) pH=2 of vanadium industrial wastewater, total 4200 mg/L of chromium concn, hexavalent chromium concentration 3600mg/L, pentavalent vanadium concentration
150mg/L, ammonia nitrogen (NH3- N) concentration 3600mg/L；Vanadium industrial wastewater is introduced into reduction reaction pond, stirs and semidry method cigarette is added
Desulfurization ash；The additional amount of semi-dry process flue gas desulphurization ash is 8 times of vanadium and chromium gross mass in vanadium industrial wastewater；
(2) pH=2.0 that inorganic acid adjusts whole materials in reduction reaction pond are added, then react under agitation
20min；Inorganic acid is hydrochloric acid；
(3) 1.5h is staticly settled after the completion of reduction reaction；
(4) mixed once liquid is introduced into neutralization precipitation pond, sodium hydroxide is added and adjusts pH=7.0, is stirred to react 20min, so
After flocculant is added, form alumen ustum in neutralization precipitation pond, continue stir 8min；The flocculant is aluminium polychloride, is added
Entering amount by concentration of the flocculant in mixed once liquid is 80ppm；
(5) 1h is staticly settled, secondary supernatant and secondary precipitate are isolated；
(6) sodium hydroxide is added and adjusts pH=9.5, be then stirred to react 20min；Magnesium salts is magnesium sulfate, and additional amount is by magnesium
Mole is 1.2 times of ammonia nitrogen mole；Phosphate is monophosphate monophosphate trisodium, and additional amount is ammonia nitrogen mole by the mole of phosphorus
1.0 times；
(7) 50min is stood；
(8) the total chromium concn 1.22mg/L of processed waste water, hexavalent chromium concentration 0.47mg/L, pentavalent vanadium concentration 0.66mg/L,
NH3-N concentration 135mg/L, total phosphorus concentration 10mg/L.
Embodiment 3
With embodiment 1, difference is method:
(1) pH=2 of vanadium industrial wastewater, total 3800 mg/L of chromium concn, hexavalent chromium concentration 3400mg/L, pentavalent vanadium concentration
100mg/L, ammonia nitrogen (NH3- N) concentration 3200mg/L；Vanadium industrial wastewater is introduced into reduction reaction pond, stirs and semidry method cigarette is added
Desulfurization ash；The additional amount of semi-dry process flue gas desulphurization ash is 6 times of vanadium and chromium gross mass in vanadium industrial wastewater；
(2) pH=2.0 that inorganic acid adjusts whole materials in reduction reaction pond are added, then react under agitation
15min；Inorganic acid is nitric acid；
(3) 1h is staticly settled after the completion of reduction reaction；
(4) mixed once liquid is introduced into neutralization precipitation pond, sodium hydroxide is added and adjusts pH=8.0, is stirred to react 15min, so
After flocculant is added, form alumen ustum in neutralization precipitation pond, continue stir 5min；The flocculant is bodied ferric sulfate, is added
Entering amount by concentration of the flocculant in mixed once liquid is 40ppm；
(5) 2h is staticly settled, secondary supernatant and secondary precipitate are isolated；
(6) sodium hydroxide is added and adjusts pH=9.5, be then stirred to react 15min；Magnesium salts is magnesium sulfate, and additional amount is by magnesium
Mole is 1 times of ammonia nitrogen mole；Phosphate is disodium hydrogen phosphate, and additional amount is ammonia nitrogen mole by the mole of phosphorus
0.9 times；
(7) 30min is stood；
(8) the total chromium concn 1.25mg/L of processed waste water, hexavalent chromium concentration 0.36mg/L, pentavalent vanadium concentration 0.9mg/L,
NH3-N concentration 181mg/L, total phosphorus concentration 9mg/L.
Embodiment 4
With embodiment 1, difference is method:
(1) pH=3 of vanadium industrial wastewater, total chromium concn 3500mg/L, hexavalent chromium concentration 3300mg/L, pentavalent vanadium concentration
50mg/L, ammonia nitrogen (NH3- N) concentration 2800mg/L；Vanadium industrial wastewater is introduced into reduction reaction pond, stirs and semidry method cigarette is added
Desulfurization ash；The additional amount of semi-dry process flue gas desulphurization ash is 5 times of vanadium and chromium gross mass in vanadium industrial wastewater；
(2) pH=3.0 that inorganic acid adjusts whole materials in reduction reaction pond are added, then react under agitation
10min；Inorganic acid is hydrochloric acid；
(3) 0.5h is staticly settled after the completion of reduction reaction；
(4) mixed once liquid is introduced into neutralization precipitation pond, sodium hydroxide is added and adjusts pH=9.0, is stirred to react 10min, so
After flocculant is added, form alumen ustum in neutralization precipitation pond, continue stir 5min；The flocculant is bodied ferric sulfate, is added
Entering amount by concentration of the flocculant in mixed once liquid is 10ppm；
(5) 3h is staticly settled, secondary supernatant and secondary precipitate are isolated；
(6) sodium hydroxide is added and adjusts pH=10.0, be then stirred to react 10min；Magnesium salts is magnesia, and additional amount presses magnesium
Mole be 1.1 times of ammonia nitrogen mole；Phosphate is sodium dihydrogen phosphate, and additional amount is ammonia nitrogen mole by the mole of phosphorus
1.0 times；
(7) 40min is stood；
(8) the total chromium concn 0.95mg/L of processed waste water, hexavalent chromium concentration 0.3mg/L, pentavalent vanadium concentration 0.65mg/L,
NH3-N concentration 129mg/L, total phosphorus concentration 11mg/L.
Claims (2)
1. a kind of method of semi-dry process flue gas desulphurization ash processing vanadium industrial wastewater, it is characterised in that sequentially include the following steps:
(1) vanadium industrial wastewater is introduced into reduction reaction pond, stir and semi-dry process flue gas desulphurization ash is added；Semi-dry process flue gas desulphurization ash
Additional amount be 5 ~ 10 times of vanadium and chromium gross mass in vanadium industrial wastewater；PH=1 ~ 3 of the vanadium industrial wastewater, total chromium concn
3500 ~ 4500 mg/L, 3300 ~ 3800mg/L of hexavalent chromium concentration, pentavalent vanadium 50 ~ 200mg/L of concentration, ammonia nitrogen concentration 2800 ~
4000mg/L；The semi-dry process flue gas desulphurization ash contains S 14.2%, CaO 46.09%, MgO 1.46%, TFe by weight percentage
0.24%, Cl 1.50%, Al2O30.22%, SiO20.94%；
(2) pH=1.0 ~ 3.0 that inorganic acid adjusts whole materials in reduction reaction pond are added, then under agitation reaction 10 ~
The vanadium of high-valence state and chromium are reduced to lower valency by 30min；
(3) at least 0.5h is staticly settled after the reaction was completed, isolates a supernatant and primary sedimentation object, primary sedimentation object is through one
Secondary filter-press dehydration obtains reduction byproduct calcium sulfate, and the first-time filtrate and a supernatant that a filter-press dehydration obtains are mixed to form
Mixed once liquid；
(4) mixed once liquid is introduced into neutralization precipitation pond, sodium hydroxide is added and adjusts pH=6.5 ~ 9.0, it is stirred to react 10 ~
Then flocculant is added in 30min, form alumen ustum in neutralization precipitation pond, continues 5 ~ 10min of stirring；The flocculant is poly-
Acrylamide, aluminium polychloride or bodied ferric sulfate, additional amount by concentration of the flocculant in mixed once liquid be 10 ~
100ppm；
(5) 0.5 ~ 3h is staticly settled, isolates secondary supernatant and secondary precipitate, secondary precipitate is through secondary filter-press dehydration shape
At mud containing chrome green, the secondary filtrate and secondary supernatant that secondary filter-press dehydration obtains are mixed to form secondary mixed liquor；
(6) secondary mixed liquor is introduced into Ammonia Nitrogen Precipitation from Simulated pond, stirs and be added magnesium salts, after magnesium salts all dissolution, stirred and be added
Phosphate adds sodium hydroxide and adjusts pH=9.0 ~ 10.0, is then stirred to react 10 ~ 30min, makes the ammonia in secondary mixed liquor
Nitrogen forms magnesium ammonium phosphate sediment；The magnesium salts is magnesium chloride, magnesium sulfate or magnesia, and additional amount is ammonia nitrogen by the mole of magnesium
1.0 ~ 1.5 times of mole；The phosphate is sodium dihydrogen phosphate, disodium hydrogen phosphate or tertiary sodium phosphate, and additional amount is by phosphorus
Mole is 0.9 ~ 1.4 times of ammonia nitrogen mole；
(7) 20 ~ 50min is stood, supernatant three times and three times sediment are isolated, sediment is obtained through filter-press dehydration three times three times
Ammonium magnesium phosphate；Three times filter-press dehydration obtain filtrate three times and three times supernatant as processed waste water；It gives up after the processing
Total chromium concn < 1.5mg/L, hexavalent chromium concentration < 0.5mg/L, pentavalent vanadium concentration < 1.0mg/L, NH in water3- N concentration <
200mg/L, total phosphorus concentration < 15mg/L.
2. a kind of method of semi-dry process flue gas desulphurization ash processing vanadium industrial wastewater according to claim 1, it is characterised in that
The inorganic acid is sulfuric acid, hydrochloric acid or nitric acid.
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| CN108672472A (en) * | 2018-06-08 | 2018-10-19 | 江苏省沙钢钢铁研究院有限公司 | It is sintered semi-dry desulphurization ash processing method |
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