CN110357318A - A kind of rare-earth industry acid waste water heavy metal processing method - Google Patents
A kind of rare-earth industry acid waste water heavy metal processing method Download PDFInfo
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- CN110357318A CN110357318A CN201910604074.9A CN201910604074A CN110357318A CN 110357318 A CN110357318 A CN 110357318A CN 201910604074 A CN201910604074 A CN 201910604074A CN 110357318 A CN110357318 A CN 110357318A
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- waste water
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- heavy metal
- earth industry
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- 239000002351 wastewater Substances 0.000 title claims abstract description 114
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 49
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 45
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 45
- 239000002253 acid Substances 0.000 title claims abstract description 30
- 238000003672 processing method Methods 0.000 title claims abstract description 18
- 238000009297 electrocoagulation Methods 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- NEMFQSKAPLGFIP-UHFFFAOYSA-N magnesiosodium Chemical compound [Na].[Mg] NEMFQSKAPLGFIP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000391 magnesium silicate Substances 0.000 claims abstract description 14
- 229910052919 magnesium silicate Inorganic materials 0.000 claims abstract description 14
- 235000019792 magnesium silicate Nutrition 0.000 claims abstract description 14
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 14
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims abstract description 13
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims abstract description 13
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 32
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 19
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 15
- 230000001112 coagulating effect Effects 0.000 claims description 14
- 239000011790 ferrous sulphate Substances 0.000 claims description 14
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 14
- 238000006386 neutralization reaction Methods 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 14
- 230000000737 periodic effect Effects 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 8
- 238000005273 aeration Methods 0.000 claims description 7
- 239000006228 supernatant Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 6
- 150000002500 ions Chemical class 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 6
- 239000005416 organic matter Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 229910021645 metal ion Inorganic materials 0.000 abstract description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000001376 precipitating effect Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000000909 electrodialysis Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010814 metallic waste Substances 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 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 description 1
- 229910001122 Mischmetal Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000000502 dialysis Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- -1 iron ion Chemical class 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000004692 metal hydroxides Chemical group 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- RECVMTHOQWMYFX-UHFFFAOYSA-N oxygen(1+) dihydride Chemical compound [OH2+] RECVMTHOQWMYFX-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 125000004646 sulfenyl group Chemical group S(*)* 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 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
- 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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses a kind of rare-earth industry acid waste water heavy metal processing methods, after waste water is neutralized, bodied ferric sulfate is added, and heavy metal ions in wastewater, organic matter are removed in conjunction with electrocoagulation technology, it is eventually adding sodium magnesium silicate and polyacrylamide, the lesser metal ion of partial size in waste water is removed.This method is simple and easy, and heavy metals removal effect is good.The present invention can effectively prevent the heavy metal pollution of rare-earth industry discharge water to heavy metal removing rate in rare-earth industry acid waste water up to 99.9% or more using physically and electrically chemical combined facture.
Description
Technical field
The invention belongs to technical field of waste water processing, and in particular to a kind of rare-earth industry acid waste water heavy metal processing side
Method.
Background technique
China's rare earth reserves are big, but are enriched with rare earth using traditional physical upgrading method, and low efficiency can only use Chemical Leaching
Method.Its extraction process process include raw ore leach, leachate removal of impurities, the Extraction of rare earth from leachate, finally obtain
Obtain the rare-earth products such as mischmetal carbonate, oxide or chloride.The processes such as leaching, removal of impurities, the precipitating of rare-earth products all need
A large amount of source chemicals are put into, lead to that a large amount of waste water and waste residue can be generated in process of production, serious pollution of ecological environment, pole
Restrict the sustainable development of Rare-earth Industry greatly.Therefore, the problem of environmental pollution for solving rare-earth industry realizes the clear of rare earth resources
Clean efficient utilization and sustainable development are the great difficult problems that China's Rare-earth Industry faces.
Chinese patent CN201410041557.X discloses a kind of method of rare-earth industry waste water removing heavy metals, utilizes function
Nano material is adsorbent, chlorine, sodium, calcium and the heavy metal etc. by chemisorption, in advanced treating rare-earth industry waste water
Ion；Function nano material refers to the nanometer material with functional group (such as sulfate, sulfenyl, amido, carboxylic acid group, phosphate)
Material.Patent CN201610851421.4 discloses a kind of rare earth heavy metal waste liquid treatment method, includes the following steps: S01: diffusion
Dialysis；S02: pretreatment；S03: bipolar membrane electrodialysis；Wherein S02: pretreatment includes the following steps: S021: alkali neutralization；
S022: nanofiltration separation；S023:SS absorption；The softening of S024:Na resin；S025: homogeneous electrodialysis.It is related to expensive equipment precision.
Summary of the invention
In view of the problems of the existing technology, the invention discloses a kind of rare-earth industry acid waste water heavy metal processing sides
After waste water is neutralized, bodied ferric sulfate is added, and go to heavy metal ions in wastewater, organic matter in conjunction with electrophoretic techniques in method
It removes, then proceedes to that sodium carbonate is added, reduce the hardness of waste water, be eventually adding sodium magnesium silicate and polyacrylamide, to grain in waste water
The lesser metal ion of diameter is removed.This method is simple and easy, and heavy metals removal effect is good.After present invention processing, row
It is put into content of beary metal in the water quality in environment and reaches discharge standard.
Technical scheme is as follows:
A kind of rare-earth industry acid waste water heavy metal processing method, comprising the following steps:
(1) it will be delivered in mixing pit after waste water oil removal, after standing 30~40min, upper layer waste water continued on to
In pond, the sodium hydroxide solution that concentration is 5mol/L is added, adjusts pH to 8~10；
(2) waste water in neutralization pond is introduced in stirring pool, polymeric ferrous sulphate solution is added, start agitating device, with 400
The speed of~500rpm is stirred, and mixing time is 30~50min, is then allowed to stand 10-30min；
(3) stirring pool supernatant liquid is introduced into electrocoagulation pond, while opens agitating device, with the speed of 500-600rpm
Degree is stirred, and puts into powdered sodium carbonate, adjusts pH to 11~12 after mixing evenly, opens electro-coagulation equipment, and control electric current changes
It is 1-5min to the period, carries out employing periodic reverse electrocoagulation and react 30~60min；
(4) waste water after reacting electrocoagulation is drained in coagulating basin, is constantly stirred with the speed of 200~300rpm
It mixes, puts into sodium magnesium silicate powder, put into polyacrylamide solution again after being spaced 5-10min, be stirred to react 10~20min；
(5) liquid is delivered to the separation that dross and water are realized from floating trough using pump in coagulating basin, enters sand from floating trough water outlet
Filter tank adjusts pH to neutrality after sand coarse aggregate ratio and obtains qualified discharge water, that is, completes to remove heavy metal in rare-earth industry acid waste water
Except processing.
As a further explanation of the present invention: the mass concentration of polymeric ferrous sulphate solution described in step (2) be 1.5~
3.5%, addition flow is 10~50L/h.
As a further explanation of the present invention: final concentration of 0.1- of the control bodied ferric sulfate in waste water in step (2)
0.5g/L。
As a further explanation of the present invention: powdered sodium carbonate addition quality is the 2~8% of wastewater quality in step (3).
As a further explanation of the present invention: it is 0.5-2V/cm that electrocoagulation described in step (3), which reacts its voltage strength,
Electric current is 1.5-3A, power 300-800W.
As a further explanation of the present invention: when carrying out employing periodic reverse electrocoagulation reaction in step (3), waste water being exposed
Gas, control aeration quantity are 1-5L/m3·min。
As a further explanation of the present invention: the addition quality of sodium magnesium silicate powder is the 0.5 of wastewater quality in step (4)
~1.5%.
As a further explanation of the present invention: the mass concentration of polyacrylamide solution is 0.1~0.5% in step (4),
It is 20~80L/h that it, which adds flow,.
As a further explanation of the present invention: final concentration of 0.02- of the control polyacrylamide in waste water in step (4)
0.1g/L。
Technical principle of the invention is as follows:
In acid waste water, heavy metal mainly exists in the form of an ion, and the pH value of waste water is adjusted to alkalinity, and introduces big
A part of heavy metal can effectively be precipitated removing in the form of hydroxide, and existed in waste water by the hydroxide ion of amount
The ligands such as chloride ion and fluorine ion can increase the solubility of hydroxide with complex at soluble matter, so control
PH processed is critically important.
Bodied ferric sulfate is that wastewater treatment often uses flocculating settling agent, to iron ion, coloration, stink, organic matter etc. in waste water
With certain removal effect.Electrophoretic techniques is the new technology of heavy metals removal, and bodied ferric sulfate is added in waste water, by waste water
In most organic matter and heavy metal ion adsorbed, then by the compound use of electrophoretic techniques, can effectively distribute polymerization
Intermediate ion current potential in ferric sulfate increases absorption of the bodied ferric sulfate to substances such as heavy metal ion, organic matters, increases wastewater treatment
Efficiency.
Sodium carbonate is reacted with calcium ion in waste water generates a large amount of precipitation of calcium carbonate, can reduce hardness in waste water, simultaneously also
It is removed from waste water with generation carbonate depositions such as Pb, Zn, Cd.
Electrocoagulation is the process for treating heavy-metal waste water that developed recently gets up, it is to utilize electrolytic oxidation iron plate or aluminium sheet
Deng generation Fe2+、Fe3+Or Al3+, become the solidifying of various hydroxo complexes and multinuclear hydroxo complex through a series of hydrolysis, polymerization
Poly- agent, adsorbable metal hydroxides form total wadding body.It is several heavy in waste water with that can remove under same pH value condition
The characteristics of metal ion.
Sodium magnesium silicate is a kind of inorganic macromolecule compound, with excellent three-dimensional space, has good adsorption energy
Power, flocculation occurs for remaining heavy metal and sodium magnesium silicate in reacted pond, sedimentation basin treated water, what is be stirred continuously
In the case of, sodium magnesium silicate is constantly contacted with heavy metal, inorganic matter, and flocculation micelle constantly increases, and forms the amorphous state chemical combination of indissoluble
Object can realize that heavy metal, inorganic matter effectively remove by the effect of clarification layering.
Adding polyacrylamide can remove 100 μm of partial size > in water of precipitating particle, increase floc particle, improve precipitating
Separating effect enables heavy metal to effectively remove, and accelerates deposition efficiency.Waste water reaches discharge standard after handling layer by layer.
Beneficial effects of the present invention:
(1) present invention is using physically and electrically chemical combined facture, to heavy metal removing rate in rare-earth industry acid waste water
Up to 99.9% or more, the heavy metal pollution of rare-earth industry discharge water can be effectively prevented.
(2) present invention can be achieved to work continuously, and treatment effeciency is high, effect is good, be suitble to large-scale rare earth heavy metal containing sewage
Processing.
(3) present device is simple, easy to operate, processing cost is low, can promote the use of in rare earth factory.
Specific embodiment
Embodiment 1:
A kind of rare-earth industry acid waste water heavy metal processing method, comprising the following steps:
(1) it will be delivered in mixing pit after waste water oil removal, after standing 30min, upper layer waste water continued on into neutralization pond
In, the sodium hydroxide solution that concentration is 5mol/L is added, adjusts pH to 9；
(2) waste water in neutralization pond is introduced in stirring pool, polymeric ferrous sulphate solution is added, start agitating device, with
The speed of 500rpm is stirred, mixing time 30min, is then allowed to stand 20min, and the quality of the polymeric ferrous sulphate solution is dense
Degree is 2%, and addition flow is 30L/h, controls final concentration of 0.3g/L of the bodied ferric sulfate in waste water；
(3) stirring pool supernatant liquid is introduced into electrocoagulation pond, while opening agitating device, with the speed of 600rpm into
Row stirring puts into powdered sodium carbonate, and powdered sodium carbonate adds 4% that quality is wastewater quality, adjusts pH to 12 after mixing evenly,
Open electro-coagulation equipment, the control electric current commutation cycle be 2min, voltage strength 2V/cm, electric current 3A, power 600W, into
Row employing periodic reverse electrocoagulation reacts 40min, while being aerated to waste water, and control aeration quantity is 4L/m3·min；
(4) waste water after reacting electrocoagulation is drained in coagulating basin, is constantly stirred with the speed of 300rpm, investment
Sodium magnesium silicate powder, addition quality are the 1.2% of wastewater quality, put into poly- third that mass concentration is 0.2% after the 10min of interval again
Acrylamide solution, addition flow are 50L/h, control final concentration of 0.05g/L of the polyacrylamide in waste water, are stirred to react
20min；
(5) liquid is delivered to the separation that dross and water are realized from floating trough using pump in coagulating basin, enters sand from floating trough water outlet
Filter tank adjusts pH to neutrality after sand coarse aggregate ratio and obtains qualified discharge water, that is, completes to remove heavy metal in rare-earth industry acid waste water
Except processing.
Embodiment 2:
A kind of rare-earth industry acid waste water heavy metal processing method, comprising the following steps:
(1) it will be delivered in mixing pit after waste water oil removal, after standing 40min, upper layer waste water continued on into neutralization pond
In, the sodium hydroxide solution that concentration is 5mol/L is added, adjusts pH to 8；
(2) waste water in neutralization pond is introduced in stirring pool, polymeric ferrous sulphate solution is added, start agitating device, with
The speed of 400rpm is stirred, mixing time 40min, is then allowed to stand 20min, and the quality of the polymeric ferrous sulphate solution is dense
Degree is 1.5%, and addition flow is 50L/h, controls final concentration of 0.1g/L of the bodied ferric sulfate in waste water；
(3) stirring pool supernatant liquid is introduced into electrocoagulation pond, while opening agitating device, with the speed of 500rpm into
Row stirring puts into powdered sodium carbonate, and powdered sodium carbonate adds 2% that quality is wastewater quality, adjusts pH to 11 after mixing evenly,
Electro-coagulation equipment is opened, the control electric current commutation cycle is 1min, voltage strength 0.5V/cm, electric current 1.5A, and power is
300W carries out employing periodic reverse electrocoagulation and reacts 60min, while being aerated to waste water, and control aeration quantity is 1L/m3·min；
(4) waste water after reacting electrocoagulation is drained in coagulating basin, is constantly stirred with the speed of 200rpm, investment
Sodium magnesium silicate powder, addition quality are the 1.5% of wastewater quality, put into poly- third that mass concentration is 0.5% after the 5min of interval again
Acrylamide solution, addition flow are 20L/h, control final concentration of 0.1g/L of the polyacrylamide in waste water, are stirred to react
10min；
(5) liquid is delivered to the separation that dross and water are realized from floating trough using pump in coagulating basin, enters sand from floating trough water outlet
Filter tank adjusts pH to neutrality after sand coarse aggregate ratio and obtains qualified discharge water, that is, completes to remove heavy metal in rare-earth industry acid waste water
Except processing.
Embodiment 3:
A kind of rare-earth industry acid waste water heavy metal processing method, comprising the following steps:
(1) it will be delivered in mixing pit after waste water oil removal, after standing 35min, upper layer waste water continued on into neutralization pond
In, the sodium hydroxide solution that concentration is 5mol/L is added, adjusts pH to 10；
(2) waste water in neutralization pond is introduced in stirring pool, polymeric ferrous sulphate solution is added, start agitating device, with
The speed of 500rpm is stirred, mixing time 50min, is then allowed to stand 10min, and the quality of the polymeric ferrous sulphate solution is dense
Degree is 3.5%, and addition flow is 10L/h, controls final concentration of 0.5g/L of the bodied ferric sulfate in waste water；
(3) stirring pool supernatant liquid is introduced into electrocoagulation pond, while opening agitating device, with the speed of 500rpm into
Row stirring puts into powdered sodium carbonate, and powdered sodium carbonate adds 8% that quality is wastewater quality, adjusts pH to 12 after mixing evenly,
Open electro-coagulation equipment, the control electric current commutation cycle be 5min, voltage strength 2V/cm, electric current 3A, power 800W, into
Row employing periodic reverse electrocoagulation reacts 30min, while being aerated to waste water, and control aeration quantity is 2L/m3·min；
(4) waste water after reacting electrocoagulation is drained in coagulating basin, is constantly stirred with the speed of 300rpm, investment
Sodium magnesium silicate powder, addition quality are the 1.5% of wastewater quality, put into poly- third that mass concentration is 0.3% after the 5min of interval again
Acrylamide solution, addition flow are 30L/h, control final concentration of 0.02g/L of the polyacrylamide in waste water, are stirred to react
20min；
(5) liquid is delivered to the separation that dross and water are realized from floating trough using pump in coagulating basin, enters sand from floating trough water outlet
Filter tank adjusts pH to neutrality after sand coarse aggregate ratio and obtains qualified discharge water, that is, completes to remove heavy metal in rare-earth industry acid waste water
Except processing.
Embodiment 4:
A kind of rare-earth industry acid waste water heavy metal processing method, comprising the following steps:
(1) it will be delivered in mixing pit after waste water oil removal, after standing 30min, upper layer waste water continued on into neutralization pond
In, the sodium hydroxide solution that concentration is 5mol/L is added, adjusts pH to 8；
(2) waste water in neutralization pond is introduced in stirring pool, polymeric ferrous sulphate solution is added, start agitating device, with
The speed of 400rpm is stirred, mixing time 30min, is then allowed to stand 30min, and the quality of the polymeric ferrous sulphate solution is dense
Degree is 2.5%, and addition flow is 20L/h, controls final concentration of 0.2g/L of the bodied ferric sulfate in waste water；
(3) stirring pool supernatant liquid is introduced into electrocoagulation pond, while opening agitating device, with the speed of 500rpm into
Row stirring puts into powdered sodium carbonate, and powdered sodium carbonate adds 6% that quality is wastewater quality, adjusts pH to 12 after mixing evenly,
Electro-coagulation equipment is opened, the control electric current commutation cycle is 4min, voltage strength 1.5V/cm, electric current 2.5A, and power is
500W carries out employing periodic reverse electrocoagulation and reacts 40min, while being aerated to waste water, and control aeration quantity is 3L/m3·min；
(4) waste water after reacting electrocoagulation is drained in coagulating basin, is constantly stirred with the speed of 300rpm, investment
Sodium magnesium silicate powder, addition quality are the 0.8% of wastewater quality, put into poly- third that mass concentration is 0.4% after the 8min of interval again
Acrylamide solution, addition flow are 60L/h, control final concentration of 0.06g/L of the polyacrylamide in waste water, are stirred to react
15min；
(5) liquid is delivered to the separation that dross and water are realized from floating trough using pump in coagulating basin, enters sand from floating trough water outlet
Filter tank adjusts pH to neutrality after sand coarse aggregate ratio and obtains qualified discharge water, that is, completes to remove heavy metal in rare-earth industry acid waste water
Except processing.
Embodiment 5:
A kind of rare-earth industry acid waste water heavy metal processing method, comprising the following steps:
(1) it will be delivered in mixing pit after waste water oil removal, after standing 30min, upper layer waste water continued on into neutralization pond
In, the sodium hydroxide solution that concentration is 5mol/L is added, adjusts pH to 9.5；
(2) waste water in neutralization pond is introduced in stirring pool, polymeric ferrous sulphate solution is added, start agitating device, with
The speed of 400rpm is stirred, mixing time 30min, is then allowed to stand 15min, and the quality of the polymeric ferrous sulphate solution is dense
Degree is 3%, and addition flow is 25L/h, controls final concentration of 0.4g/L of the bodied ferric sulfate in waste water；
(3) stirring pool supernatant liquid is introduced into electrocoagulation pond, while opening agitating device, with the speed of 500rpm into
Row stirring puts into powdered sodium carbonate, and powdered sodium carbonate adds 5% that quality is wastewater quality, adjusts pH to 11 after mixing evenly,
Electro-coagulation equipment is opened, the control electric current commutation cycle is 2.5min, voltage strength 2V/cm, electric current 1.5A, and power is
400W carries out employing periodic reverse electrocoagulation and reacts 50min, while being aerated to waste water, and control aeration quantity is 2.5L/m3·min；
(4) waste water after reacting electrocoagulation is drained in coagulating basin, is constantly stirred with the speed of 200rpm, investment
Sodium magnesium silicate powder, addition quality are the 0.5% of wastewater quality, put into poly- third that mass concentration is 0.3% after the 5min of interval again
Acrylamide solution, addition flow are 70L/h, control final concentration of 0.05g/L of the polyacrylamide in waste water, are stirred to react
15min；
(5) liquid is delivered to the separation that dross and water are realized from floating trough using pump in coagulating basin, enters sand from floating trough water outlet
Filter tank adjusts pH to neutrality after sand coarse aggregate ratio and obtains qualified discharge water, that is, completes to remove heavy metal in rare-earth industry acid waste water
Except processing.
Claims (9)
1. a kind of rare-earth industry acid waste water heavy metal processing method, which comprises the following steps:
(1) it will be delivered in mixing pit after waste water oil removal, after standing 30 ~ 40min, upper layer waste water continued on into neutralization pond
In, the sodium hydroxide solution that concentration is 5mol/L is added, adjusts pH to 8 ~ 10；
(2) waste water in neutralization pond is introduced in stirring pool, polymeric ferrous sulphate solution is added, start agitating device, with 400 ~
The speed of 500rpm is stirred, and mixing time is 30 ~ 50min, is then allowed to stand 10-30min；
(3) stirring pool supernatant liquid is introduced into electrocoagulation pond, while opens agitating device, with the speed of 500-600 rpm
It is stirred, puts into powdered sodium carbonate, adjust pH to 11 ~ 12 after mixing evenly, open electro-coagulation equipment, control electric current commutation week
Phase is 1-5min, carries out employing periodic reverse electrocoagulation and reacts 30 ~ 60min；
(4) waste water after reacting electrocoagulation is drained in coagulating basin, is constantly stirred with the speed of 200 ~ 300rpm, investment
Sodium magnesium silicate powder puts into polyacrylamide solution after being spaced 5-10min again, is stirred to react 10 ~ 20min；
(5) liquid is delivered to the separation that dross and water are realized from floating trough using pump in coagulating basin, enters sand filter from floating trough water outlet,
PH is adjusted after sand coarse aggregate ratio and obtains qualified discharge water to neutrality, that is, is completed to the removal of heavy metal in rare-earth industry acid waste water
Reason.
2. a kind of rare-earth industry acid waste water heavy metal processing method according to claim 1, it is characterised in that: step (2)
Described in polymeric ferrous sulphate solution mass concentration be 1.5 ~ 3.5%, addition flow be 10 ~ 50L/h.
3. a kind of rare-earth industry acid waste water heavy metal processing method according to claim 2, it is characterised in that: step (2)
Final concentration of 0.1-0.5 g/L of the middle control bodied ferric sulfate in waste water.
4. a kind of rare-earth industry acid waste water heavy metal processing method according to claim 1, it is characterised in that: step (3)
Middle powdered sodium carbonate addition quality is the 2 ~ 8% of wastewater quality.
5. a kind of rare-earth industry acid waste water heavy metal processing method according to claim 1, it is characterised in that: step (3)
Described in electrocoagulation react its voltage strength be 0.5-2V/cm, electric current 1.5-3A, power 300-800W.
6. a kind of rare-earth industry acid waste water heavy metal processing method according to claim 5, it is characterised in that: step (3)
When middle progress employing periodic reverse electrocoagulation reaction, waste water is aerated, control aeration quantity is 1-5L/m3·min。
7. a kind of rare-earth industry acid waste water heavy metal processing method according to claim 1, it is characterised in that: step (4)
The addition quality of middle sodium magnesium silicate powder is the 0.5 ~ 1.5% of wastewater quality.
8. a kind of rare-earth industry acid waste water heavy metal processing method according to claim 1, it is characterised in that: step (4)
The mass concentration of middle polyacrylamide solution is 0.1 ~ 0.5%, and addition flow is 20 ~ 80L/h.
9. a kind of rare-earth industry acid waste water heavy metal processing method according to claim 8, it is characterised in that: step (4)
Final concentration of 0.02-0.1 g/L of the middle control polyacrylamide in waste water.
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