CN107935281A - A kind of method for handling hexavalent chromium wastewater - Google Patents
A kind of method for handling hexavalent chromium wastewater Download PDFInfo
- Publication number
- CN107935281A CN107935281A CN201711122654.1A CN201711122654A CN107935281A CN 107935281 A CN107935281 A CN 107935281A CN 201711122654 A CN201711122654 A CN 201711122654A CN 107935281 A CN107935281 A CN 107935281A
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- China
- Prior art keywords
- lead
- hexavalent chromium
- chromate
- solid slag
- solid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 42
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 239000007787 solid Substances 0.000 claims abstract description 44
- 239000002893 slag Substances 0.000 claims abstract description 36
- 238000001914 filtration Methods 0.000 claims abstract description 29
- PXLIDIMHPNPGMH-UHFFFAOYSA-N sodium chromate Chemical compound [Na+].[Na+].[O-][Cr]([O-])(=O)=O PXLIDIMHPNPGMH-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000002425 crystallisation Methods 0.000 claims abstract description 22
- 230000008025 crystallization Effects 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- MOUPNEIJQCETIW-UHFFFAOYSA-N lead chromate Chemical compound [Pb+2].[O-][Cr]([O-])(=O)=O MOUPNEIJQCETIW-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011259 mixed solution Substances 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000013078 crystal Substances 0.000 claims abstract description 14
- PIJPYDMVFNTHIP-UHFFFAOYSA-L lead sulfate Chemical compound [PbH4+2].[O-]S([O-])(=O)=O PIJPYDMVFNTHIP-UHFFFAOYSA-L 0.000 claims abstract description 13
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000013049 sediment Substances 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 9
- HWSZZLVAJGOAAY-UHFFFAOYSA-L lead(II) chloride Chemical compound Cl[Pb]Cl HWSZZLVAJGOAAY-UHFFFAOYSA-L 0.000 claims abstract description 8
- 239000011651 chromium Substances 0.000 claims description 34
- 238000001704 evaporation Methods 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 23
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 22
- 229910052804 chromium Inorganic materials 0.000 claims description 22
- 238000003756 stirring Methods 0.000 claims description 19
- 230000008020 evaporation Effects 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 14
- 239000000706 filtrate Substances 0.000 claims description 10
- 239000010413 mother solution Substances 0.000 claims description 9
- 150000003839 salts Chemical class 0.000 claims description 9
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 7
- 229910052708 sodium Inorganic materials 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 6
- IHYNKGRWCDKNEG-UHFFFAOYSA-N n-(4-bromophenyl)-2,6-dihydroxybenzamide Chemical compound OC1=CC=CC(O)=C1C(=O)NC1=CC=C(Br)C=C1 IHYNKGRWCDKNEG-UHFFFAOYSA-N 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000005660 chlorination reaction Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 3
- ZOCLAPYLSUCOGI-UHFFFAOYSA-M potassium hydrosulfide Chemical compound [SH-].[K+] ZOCLAPYLSUCOGI-UHFFFAOYSA-M 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims 1
- 229920002472 Starch Polymers 0.000 claims 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 239000005864 Sulphur Substances 0.000 claims 1
- DNHVXYDGZKWYNU-UHFFFAOYSA-N lead;hydrate Chemical compound O.[Pb] DNHVXYDGZKWYNU-UHFFFAOYSA-N 0.000 claims 1
- 229910052700 potassium Inorganic materials 0.000 claims 1
- 239000011591 potassium Substances 0.000 claims 1
- 235000019698 starch Nutrition 0.000 claims 1
- 239000008107 starch Substances 0.000 claims 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 abstract description 8
- 238000001556 precipitation Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Chemical class O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 159000000009 barium salts Chemical class 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 2
- 150000003841 chloride salts Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- DPLVEEXVKBWGHE-UHFFFAOYSA-N potassium sulfide Chemical compound [S-2].[K+].[K+] DPLVEEXVKBWGHE-UHFFFAOYSA-N 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 241000165940 Houjia Species 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 208000031320 Teratogenesis Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005349 anion exchange Methods 0.000 description 1
- QFFVPLLCYGOFPU-UHFFFAOYSA-N barium chromate Chemical compound [Ba+2].[O-][Cr]([O-])(=O)=O QFFVPLLCYGOFPU-UHFFFAOYSA-N 0.000 description 1
- 229940083898 barium chromate Drugs 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000219 mutagenic Toxicity 0.000 description 1
- 230000003505 mutagenic effect Effects 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 231100000004 severe toxicity Toxicity 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G37/00—Compounds of chromium
- C01G37/14—Chromates; Bichromates
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The present invention relates to technical field of waste water processing, provide a kind of method for handling hexavalent chromium wastewater, lead sulfate or lead chloride powder are added in chromyl waste water, obtains solid slag by phase in version process, the solid slag includes plumbous chromate, lead sulfate or lead chloride；The solid slag is sized mixing with water, sulfide is then added and carries out dissolving conversion, obtain mixed solution；Filter the mixed solution and obtain vulcanized lead sediment, the mixed solution evaporative crystallization after filtering is obtained into crystals of sodium chromate.Beneficial effects of the present invention are：The technological effect of existing precipitation of lead chromate method purified treatment chromate waste water and the purity of precipitated product can be improved well so that flow is short, efficient, and obtained chromic acid salt crystal, which is easily returned to, to be recycled；Method simple practical, has a extensive future.
Description
Technical field
The present invention relates to technical field of waste water processing, more particularly to a kind of method for handling hexavalent chromium wastewater, especially not
It must aoxidize, fast eliminating and the method for recycling Cr VI under faintly acid or even neutrallty condition.
Background technology
Chromium is important metals resources, extensive in sector applications such as stainless steel, tanning, plating, pigment.But its toxicity is drawn
The problem of environmental pollution risen is also widely worried for people, and the physiological-toxicity of especially Cr VI is 100 times of trivalent chromium, belongs to cause
Cancer, teratogenesis, mutagenic extremely toxic substance, it is very harmful, therefore be even more to pay close attention to object for environmental improvement.Actual is all kinds of
Often the chromium of two kinds of valence states all exists in chromium slag, chromate waste water, and can be converted with the change of environment.Common improvement
Chromium slag, the method for chrome waste water are to walk reduction etc. in the Technology Ways of reduction, including high temperature reduction, aqueous medium.Due in aqueous medium
It is most common situation to remove chromium, therefore for the processing of all kinds of chromate waste waters, many restoring method, including variousization occurs
Learn reduction medicament, micro-reduction, photo catalytic reduction etc..
And for the processing of hexavalent chromium wastewater, a reduction process is undergone, then can increase reagent consumption, operating process is drawn
The reality troubles such as long, equipment investment increase, therefore removing can be directly isolated, process flow will be greatly shortened.Anion
Exchange and adsorption method, can be by CrO4 2-、 HCrO4 -Removing is directly exchanged, is enriched with and obtains the chromic salts of high concentration, realizes resource
Change and recycle.But in actual operational process, often due to complicated component is various in waste water so that resin or sorbing material
Repetition absorption property serious deterioration, therefore the precondition smoothly to be applied in real life scenarios is still very harsh.
Another method is then the barium salt precipitation method, forms BaCrO4Deposition removal, adds more and residues in the Ba in water2+It can then pass through
Add sulfate precipitation removing.Barium chromate can be sold at high price as important industrial chemicals.But barium salt source is relatively more tired
Difficulty, soluble barium salt's severe toxicity, therefore this method is gradually eliminated.But the advantage of this method, or it is worth what is used for reference.Therefore
There is the soluble lead salt of addition and take off chromium to form the method for precipitation of lead chromate, realize the selective recovery of chromic salts, and remain
The removing of lead then forms PbS deposition removals using addition sulphurizing salt.In actual processing procedure, due to the soluble lead salt of addition with
The precipitation reaction of chromate is very fast, and the precipitation of lead chromate granularity of formation is tiny, absorbs and sweeps along impurity serious, causes its solid-liquid
Separation property, purity etc. are bad, therefore have further improvement, perfect necessity.
The content of the invention
The purpose of the present invention is exactly to have overcome the deficiencies of the prior art and provide a kind of method for handling hexavalent chromium wastewater, institute
Obtained plumbous chromate particle is more thick, fine and close, is conducive to follow-up filtering, washing or even purity and improves, can change well
It is apt to the technological effect of existing precipitation of lead chromate method purified treatment chromate waste water and the purity of precipitated product.
A kind of method for handling hexavalent chromium wastewater of the present invention, adds lead sulfate or chlorination lead powder in chromyl waste water
End, obtains solid slag, the solid slag includes plumbous chromate by phase in version process；The solid slag is sized mixing with water, Ran Houjia
Enter sulfide and carry out dissolving conversion, obtain mixed solution；Filter the mixed solution and obtain vulcanized lead sediment, after filtering
The mixed solution evaporative crystallization obtains crystals of sodium chromate.
Further, specifically comprise the following steps：
Step 1: taking the waste water containing Cr VI, initial pH is adjusted as acidity；
Step 2: 1.05 ~ 3 times of ratios of the molal quantity in the waste water according to Cr VI add lead sulfate or chlorination lead powder
End, control endpoint pH is between 3 ~ 5；
Step 3: filtering after reaction, solid slag is obtained；The solid slag is plumbous chromate, lead sulfate or lead chloride；
Step 4: adding water to size mixing the solid slag, solid-to-liquid ratio is controlled in 1g/3mL ~ 1g/30mL；
Step 5: in the slurry obtained in step 4, sulfide is added, mixed solution is obtained, until the mixed solution
There is no yellow in color or be converted into black；
Step 6: filtering the mixed solution, vulcanized lead sediment is obtained；
Step 7: by the filtered fluid evaporation postcooling crystallization after step 6 is handled, crystals of sodium chromate is obtained.
Further, the sulfide is soluble sulphurizing salt.
Further, the sulfide is vulcanized sodium, potassium sulfide, sodium bisulfide, potassium hydrogen sulfide or hydrogen sulfide.
Further, in step 1, the initial pH is between 2 ~ 6.
Further, be kept stirring in the reaction process of step 2,1 ~ 24 it is small when after filter.
Further, in step 3, discharge or reuse after chromium, lead are up to standard in the filtered fluid after filtering.
Further, the vulcanized lead sediment obtained in step 6 is heaped and is uniformly processed.
Further, 10 liters, hexavalent chromium concentration 2.6g/L of the waste water containing Cr VI is taken, adjusts initial pH 3；Add
Enter 180 grams of lead sulfate powder, control endpoint pH is kept stirring 4,14 it is small when after filter, chromium content is in filtered fluid
0.3mg/L, lead 0.2mg/L,；Water is added to size mixing filtering solid slag, solid-to-liquid ratio control is in 1g/10mL, addition vulcanized sodium solid 42
Gram, when stirring 12 is small, the solid slag that is obtained by filtration, main component is vulcanized lead, and special heap is uniformly processed；Filtered fluid then heats
To 90 degrees Celsius of evaporation postcooling crystallizations, crystals of sodium chromate is obtained, and the crystalline mother solution after evaporating then is closed with next group filtrate and criticized
Evaporative crystallization extracts sodium chromate.
Further, 10 liters, hexavalent chromium concentration 2.6g/L of the waste water containing Cr VI is taken, adjusts initial pH 3；Add
Enter 180 grams of lead chloride powder, control endpoint pH is kept stirring 4.3,6 it is small when after filter, chromium content is in filtered fluid
0.3mg/L, lead 0.4mg/L,；Water is added to size mixing filtering solid slag, solid-to-liquid ratio control is in 1g/10mL, addition sodium bisulfide solid
35 grams, when stirring 12 is small, the solid slag that is obtained by filtration, main component is vulcanized lead, and special heap is uniformly processed；Filtered fluid then adds
Heat is crystallized to 90 degrees Celsius of evaporation postcoolings, obtains crystals of sodium chromate, and the crystalline mother solution after evaporating then is closed with next group filtrate
Criticize evaporative crystallization extraction sodium chromate.
The present invention operation principle be：Lead sulfate or lead chloride powder are added into chromyl waste water, in faintly acid
Under the conditions of can become plumbous chromate powder after an inversion of phases process, so as to directly remove six in water in the form of plumbous chromate
Valency chromium.To ensure completely de- chromium, the additive amount of water-insoluble lead salt can be slightly excessive, then the sediment powder obtained mainly into
It is divided into plumbous chromate, lead sulfate or lead chloride powder.Due to using water-insoluble lead salt instead as lead source, it is in chromate ion
The process of one dissolution-recrystallization of experience is needed under combination, therefore, obtained plumbous chromate particle is more thick, fine and close,
Be conducive to follow-up filtering, washing or even purity to improve.Precipitated product is mixture, can be sized mixing with water, then added again
Sulfide carries out dissolving conversion, vulcanized lead sediment, chromium acid sodium solution and sodium sulphate or sodium chloride solution is obtained, after filtered
Solution evaporative crystallization.
Beneficial effects of the present invention are：Existing precipitation of lead chromate method purified treatment chromate waste water can be improved well
The purity of technological effect and precipitated product so that flow is short, efficient, and obtained chromic acid salt crystal, which is easily returned to circulation, to be made
With；Method simple practical, has a extensive future.
Brief description of the drawings
Fig. 1 show a kind of method process flow diagram for handling hexavalent chromium wastewater of the embodiment of the present invention.
Embodiment
The specific embodiment of the invention is described in detail below in conjunction with specific attached drawing.It should be noted that in following embodiments
The combination of the technical characteristic or technical characteristic of description is not construed as isolated, they can be mutually combined so as to reaching
To superior technique effect.In the attached drawing of following embodiments, identical label that each attached drawing occurs represent identical feature or
Person's component, can be applied in different embodiments.
Embodiment 1：
10 liters, hexavalent chromium concentration 2.6g/L of the waste water containing Cr VI is taken, adjusts initial pH 3；Add 180 grams of lead sulfates
Powder, control endpoint pH and are kept stirring between 4,14 it is small when after filter, chromium content is 0.3mg/L in filtered fluid, lead
0.2mg/L,；Water is added to size mixing filtering solid slag, solid-to-liquid ratio control is in 1g/10mL, 42 grams of addition vulcanized sodium solid, stirring 12
Hour, the solid slag being obtained by filtration, main component is vulcanized lead, and special heap is uniformly processed；It is Celsius that filtered fluid is then heated to 90
Degree evaporation postcooling crystallization, obtains crystals of sodium chromate, and the crystalline mother solution after evaporating then closes batch evaporative crystallization with next group filtrate
Extract sodium chromate.
Embodiment 2：
10 liters, hexavalent chromium concentration 2.6g/L of the waste water containing Cr VI is taken, adjusts initial pH 3；Add 160 grams of lead chlorides
Powder, control endpoint pH and are kept stirring between 3-5,11 it is small when after filter, chromium content is 0.2mg/L in filtered fluid, lead
0.7mg/L,；Water is added to size mixing filtering solid slag, solid-to-liquid ratio control is in 1g/10mL, 66 grams of addition potassium sulfide solid, stirring 12
Hour, the solid slag being obtained by filtration, main component is vulcanized lead, and special heap is uniformly processed；It is Celsius that filtered fluid is then heated to 90
Degree evaporation postcooling crystallization, obtains crystals of sodium chromate, and the crystalline mother solution after evaporating then closes batch evaporative crystallization with next group filtrate
Extract sodium chromate.
Embodiment 3：
10 liters, hexavalent chromium concentration 2.6g/L of the waste water containing Cr VI is taken, adjusts initial pH 3；Add 180 grams of lead chlorides
Powder, control endpoint pH and are kept stirring between 3-4,6 it is small when after filter, chromium content is 0.3mg/L in filtered fluid, lead
0.4mg/L,；Water is added to size mixing filtering solid slag, solid-to-liquid ratio control is in 1g/10mL, 35 grams of addition sodium bisulfide solid, stirring
12 it is small when, the solid slag that is obtained by filtration, main component is vulcanized lead, and special heap is uniformly processed；Filtered fluid is then heated to 90 and takes the photograph
The evaporation postcooling crystallization of family name's degree, obtains crystals of sodium chromate, and the crystalline mother solution after evaporating then closes batch evaporation knot with next group filtrate
Crystalline substance extraction sodium chromate.
Embodiment 4：
10 liters, hexavalent chromium concentration 2.6g/L of the waste water containing Cr VI is taken, adjusts initial pH 3；Add 180 grams of lead sulfates
Powder, control endpoint pH and are kept stirring 4,14 it is small when after filter, chromium content is 0.3mg/L, lead 0.2mg/ in filtered fluid
L,；Water is added to size mixing filtering solid slag, solid-to-liquid ratio control is bubbled into hydrogen sulfide gas under 1g/10mL, ventilation condition, directly
Become black completely to solid slag, be stirred for 12 it is small when, the solid slag that is obtained by filtration, main component is vulcanized lead, special to heap
It is uniformly processed；Filtered fluid is then heated to 90 degrees Celsius of evaporation postcooling crystallizations, obtains crystals of sodium chromate, and the crystallization after evaporating is female
Liquid then closes batch evaporative crystallization extraction sodium chromate with next group filtrate.
Embodiment 5:
Take 10 liters of the waste water of certain Electroplate Factory, wherein hexavalent chromium concentration is 1.3g/L, and nickel, iron, zinc are in 0.5g/L or so, initially
PH is 3；Add 80 grams of lead sulfate powder, control endpoint pH and is kept stirring 3.7,12 it is small when after filter, chromium in filtered fluid
Content is 0.5mg/L, lead 0.3mg/L, and nickel, iron, zinc in 0.5g/L or so, adjust pH to 10.5, and add 1% mass concentration
20 milliliters of PAM, filtered after making sediment flocculation sediment, filter residue, which is sent, to be uniformly processed, filtrate recycle or standard discharge；Will filtering
Solid slag adds water to size mixing, and solid-to-liquid ratio is controlled in 1g/10mL, adds 25 grams of vulcanized sodium solid, when stirring 12 is small, is obtained by filtration
Solid slag, main component are vulcanized lead, and special heap is uniformly processed；Filtered fluid is then heated to 90 degrees Celsius of evaporation postcooling knots
Crystalline substance, obtains crystals of sodium chromate, and the crystalline mother solution after evaporating then closes batch evaporative crystallization extraction sodium chromate with next group filtrate.
In above-described embodiment 1-5, filtered fluid refers to the chromate solution compared with dilute concentration, filters off except solid therein
Grain；Crystalline mother solution after evaporation then refers to the filtered fluid being concentrated by evaporation, and separates out the high chromium concentration acid group solution after solid.
Although having been presented for several embodiments of the present invention herein, it will be appreciated by those of skill in the art that
Without departing from the spirit of the invention, the embodiments herein can be changed.Above-described embodiment is only exemplary, no
Restriction that should be using the embodiments herein as interest field of the present invention.
Claims (10)
- A kind of 1. method for handling hexavalent chromium wastewater, it is characterised in that lead sulfate or chlorination are added in chromyl waste water Lead powder end, obtains solid slag, the solid slag includes plumbous chromate by phase in version process；The solid slag is sized mixing with water, so Sulfide is added afterwards and carries out dissolving conversion, obtains mixed solution；Filter the mixed solution and obtain vulcanized lead sediment, will filter The mixed solution evaporative crystallization afterwards obtains crystals of sodium chromate.
- 2. the method for processing hexavalent chromium wastewater as claimed in claim 1, it is characterised in that specifically comprise the following steps：Step 1: taking the waste water containing Cr VI, initial pH is adjusted as acidity；Step 2: 1.05 ~ 3 times of ratios of the molal quantity in the waste water according to Cr VI add lead sulfate or chlorination lead powder End, control endpoint pH is between 3 ~ 5；Step 3: filtering after reaction, solid slag is obtained；The solid slag is plumbous chromate, lead sulfate or lead chloride；Step 4: adding water to size mixing the solid slag, solid-to-liquid ratio is controlled in 1g/3mL ~ 1g/30mL；Step 5: in the slurry obtained in step 4, sulfide is added, mixed solution is obtained, until the mixed solution There is no yellow in color or be converted into black；Step 6: filtering the mixed solution, vulcanized lead sediment is obtained；Step 7: by the filtered fluid evaporation postcooling crystallization after step 6 is handled, crystals of sodium chromate is obtained.
- 3. the method for processing hexavalent chromium wastewater as claimed in claim 1 or 2, it is characterised in that the sulfide is solubility Sulphurizing salt.
- 4. the method for processing hexavalent chromium wastewater as claimed in claim 3, it is characterised in that the sulfide is vulcanized sodium, sulphur Change potassium, sodium bisulfide, potassium hydrogen sulfide or hydrogen sulfide.
- 5. the method for processing hexavalent chromium wastewater as claimed in claim 2, it is characterised in that in step 1, the initial pH is 2 Between ~ 6.
- 6. the method for processing hexavalent chromium wastewater as claimed in claim 2, it is characterised in that kept in the reaction process of step 2 Stirring, 1 ~ 24 it is small when after filter.
- 7. the method for processing hexavalent chromium wastewater as claimed in claim 2, it is characterised in that in step 3, the filtering after filtering Discharge or reuse after chromium, lead are up to standard in liquid.
- 8. the method for processing hexavalent chromium wastewater as claimed in claim 2, it is characterised in that the vulcanized lead obtained in step 6 sinks Starch is heaped and is uniformly processed.
- 9. the method for processing hexavalent chromium wastewater as claimed in claim 2, it is characterised in that take the waste water 10 containing Cr VI Rise, hexavalent chromium concentration 2.6g/L, adjusts initial pH 3；180 grams of lead sulfate powder are added, control endpoint pH is protected 4 Hold stirring, 14 it is small when after filter, chromium content is 0.3mg/L, lead 0.2mg/L in filtered fluid,；Water is added to size mixing filtering solid slag, Solid-to-liquid ratio control adds 42 grams of vulcanized sodium solid in 1g/10mL, when stirring 12 is small, the solid slag that is obtained by filtration, and main component For vulcanized lead, special heap is uniformly processed；Filtered fluid is then heated to 90 degrees Celsius of evaporation postcooling crystallizations, obtains sodium chromate crystalline substance Body, and the crystalline mother solution after evaporating then closes batch evaporative crystallization extraction sodium chromate with next group filtrate.
- 10. the method for processing hexavalent chromium wastewater as claimed in claim 2, it is characterised in that take the waste water 10 containing Cr VI Rise, hexavalent chromium concentration 2.6g/L, adjusts initial pH 3；180 grams of lead chloride powder are added, control endpoint pH 4.3, and Be kept stirring, 6 it is small when after filter, chromium content is 0.3mg/L, lead 0.4mg/L in filtered fluid,；Water is added to size mixing filtering solid slag, Solid-to-liquid ratio control adds 35 grams of sodium bisulfide solid in 1g/10mL, when stirring 12 is small, the solid slag that is obtained by filtration, mainly into It is divided into vulcanized lead, special heap is uniformly processed；Filtered fluid is then heated to 90 degrees Celsius of evaporation postcooling crystallizations, obtains sodium chromate crystalline substance Body, and the crystalline mother solution after evaporating then closes batch evaporative crystallization extraction sodium chromate with next group filtrate.
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