CN204550266U - A kind for the treatment of unit containing superfine silica powder waste water - Google Patents
A kind for the treatment of unit containing superfine silica powder waste water Download PDFInfo
- Publication number
- CN204550266U CN204550266U CN201520047629.1U CN201520047629U CN204550266U CN 204550266 U CN204550266 U CN 204550266U CN 201520047629 U CN201520047629 U CN 201520047629U CN 204550266 U CN204550266 U CN 204550266U
- Authority
- CN
- China
- Prior art keywords
- collecting tank
- water collecting
- pump
- alkali lye
- flocculation sedimentation
- 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.)
- Expired - Fee Related
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000002351 wastewater Substances 0.000 title claims abstract description 56
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 30
- 239000000843 powder Substances 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 238000005189 flocculation Methods 0.000 claims abstract description 29
- 230000016615 flocculation Effects 0.000 claims abstract description 28
- 238000004062 sedimentation Methods 0.000 claims abstract description 26
- 239000003513 alkali Substances 0.000 claims abstract description 23
- 239000005046 Chlorosilane Substances 0.000 claims abstract description 16
- 239000002912 waste gas Substances 0.000 claims abstract description 16
- KOPOQZFJUQMUML-UHFFFAOYSA-N chlorosilane Chemical compound Cl[SiH3] KOPOQZFJUQMUML-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000005406 washing Methods 0.000 claims abstract description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 49
- 239000011863 silicon-based powder Substances 0.000 abstract description 35
- 238000000034 method Methods 0.000 abstract description 31
- 230000008569 process Effects 0.000 abstract description 15
- 238000001914 filtration Methods 0.000 abstract description 10
- 239000003795 chemical substances by application Substances 0.000 abstract description 9
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 239000006228 supernatant Substances 0.000 abstract description 6
- 238000004065 wastewater treatment Methods 0.000 abstract description 5
- 239000000706 filtrate Substances 0.000 abstract description 4
- 229910021420 polycrystalline silicon Inorganic materials 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 4
- 229920005591 polysilicon Polymers 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 36
- 235000013312 flour Nutrition 0.000 description 15
- 229910052710 silicon Inorganic materials 0.000 description 11
- 239000010703 silicon Substances 0.000 description 11
- 239000002245 particle Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 239000004744 fabric Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 239000010451 perlite Substances 0.000 description 3
- 235000019362 perlite Nutrition 0.000 description 3
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 3
- 239000005052 trichlorosilane Substances 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000003311 flocculating effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 229910021642 ultra pure water Inorganic materials 0.000 description 2
- 239000012498 ultrapure water Substances 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 229910003902 SiCl 4 Inorganic materials 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- SLLGVCUQYRMELA-UHFFFAOYSA-N chlorosilicon Chemical compound Cl[Si] SLLGVCUQYRMELA-UHFFFAOYSA-N 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- -1 polyoxyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011403 purification operation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006557 surface reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The utility model discloses a kind for the treatment of unit containing superfine silica powder waste water, belongs to the process field of polysilicon industry silicon powder-containing waste water; In device described in the utility model, wastewater collection pond, alkali lye pond are connected with flocculation sedimentation tank respectively by pump, and the lower end of flocculation sedimentation tank is communicated with pressure filter by pump, upper end is communicated with alkaline water collecting tank; Alkaline water collecting tank is communicated with alkali lye pond, service water collecting tank by pump, and service water collecting tank is connected with chlorosilane waste gas drip washing equipment by pump; Flocculation sedimentation tank, inside, alkali lye pond are respectively equipped with agitator I and agitator II, are equipped with valve between each parts be connected.Device described in the utility model can alleviate the load of existing pressure-filtering process, improve filtration efficiency, the absorption agent that supernatant liquor alkaline water and filtrate alkaline water are used for chlorosilane waste gas drip washing operation realizes recycling, meanwhile, alleviates the processing pressure of subsequent wastewater treatment system.
Description
Technical field
The utility model relates to a kind for the treatment of unit containing superfine silica powder waste water, belongs to the process field of polysilicon industry silicon powder-containing waste water.
Background technology
Silicon powder-containing wastewater source: in silicon core preparation section, with the silica flour that silicon core saw cutting silicon rod produces, wash the formed silicon powder-containing waste water containing superfine silica powder with ultrapure water as the direct cooling of silicon rod cutting process with to silicon core saw, silicon rod surface simultaneously.
Silica flour in silicon powder-containing waste water is very thin, major part grain diameter is 0.1 ~ 1 μm of scope, major part fine particle suspends in water, leave standstill and also only have half a year more than part macrobead to be deposited on bottom, the tiny silica flour of major part still suspends in water, and makes silicon powder-containing waste water be in muddy state always.
Because the silica flour in silicon powder-containing waste water is very thin, its surface reaction activity is high, can react with water, produces H
2, so silicon powder-containing waste water can not standing storage, have the danger of catching fire, chemical formula: Si+3H
2o → H
2siO
3+ 2H
2↑.The utility model people thinks that the silicon powder surface in silicon powder-containing waste water there occurs change (aquation generation silicic acid), if reclaimed by the silica flour in its silicon powder-containing waste water, very difficult, and to obtain material may not be high purity polycrystalline silicon.
Because in silicon powder-containing waste water, silicon powder particle particle diameter is less, general filtration treatment effect is bad, and process after water turbidity still higher, also qualified discharge cannot be difficult to by direct reuse, aquation silica flour blocking filter cloth is serious in addition, and make filtration resistance large, filtration efficiency is low, change filter cloth cycle time, cost is high.
Assign to from the one-tenth of silicon powder-containing waste water, be substantially made up of superfine silica powder and ultrapure water.If institute's silicon powder-containing can not be removed in water, water is just difficult to recycle, and does not also meet the standard of cleaner production.
The silicon powder-containing method of wastewater treatment that present stage is reported mainly processes by the method for wastewater treatment containing general suspended substance, namely be add the flocculation agents such as polymerize aluminum chloride (PAC), polyacrylamide (PAM), polyacrylic acid silicon powder-containing waste water flocculating is precipitated, this method process silicon powder-containing waste water, weak effect, and introduce other elements a lot, the recycling of water after process is impacted.
Patent CN103272433A discloses a kind of silicon powder-containing waste water filtering purifying treatment method, this silicon powder-containing waste component is identical with silicon powder-containing waste water of the present utility model, the method is using perlite or diatomite as flocculating aids, first by perlite or diatomite and clear water mixing, then chamber-type press filter press filtration is used, perlite or diatomite form one deck filter membrane on the filter cloth of chamber-type press filter, then switch silicon powder-containing waste water continue through chamber-type press filter filter.The advantage of this invention is the water after processing is neutrality, can directly discharge or reuse, the weak point that this invention exists is that the filtrate in early stage is defective, and need constantly to change filter membrane, cost is high, in addition because silica flour particle diameter in silicon powder-containing waste water is less, filter membrane blocking is serious, difficult cleaning, and cleaning filter cloth produces again a large amount of waste water, increase wastewater flow rate, make processing efficiency low.
Patent CN102653433A discloses the treatment process of the processing wastewater preparing silicon wafer, this silicon powder-containing waste component is different from silicon powder-containing waste component of the present utility model, in this invention, the main component of processing wastewater also has SiC and organism except silica flour, the first step of this invention removes particulate in processing wastewater exactly, the method is mentioned and is made particle coagulation become colloid by the method for chemical flocculation, realize solid-liquid separation through precipitation unit again, obtain supernatant liquor and exist without obvious particle.This invention does not talk about to use which kind of flocculation agent, mentions the particulate that the method can remove 90% ~ 95% in patent.
Patent CN101683981A discloses a kind of waste silicon solution reclaiming method, the useless silicon waste water that this patent the first step mentions cutting silicon rod generation carries out centrifugation, filter cloth aperture is 800 ~ 1500 orders, obtains silica flour material, is obtaining solar energy-level silicon wafer through a series of physico-chemical process recovery.The advantage of the method is the resource utilization achieving silica flour in silicon powder-containing waste water, and processed water, but for the silicon powder-containing waste water in the utility model, its silica flour particle diameter is very thin, directly silicon powder-containing waste water is carried out centrifugation and inapplicable, its treatment effect is bad.
Patent CN103028329A discloses a kind of abrasive waste water reuse with tube type filter membrance assembly, silica powder recovering device, this patent is mainly with can the tube type filter membrance assembly of back flushing be the silicon powder-containing sewage treatment equipment of main body, the advantage of this invention is that treatment effect is good, processing efficiency is high, but the method cost is higher.
In the open silicon cutting wastewater of patent CN101683981A, silica flour and waste water reclamation utilize devices and methods therefor, this invention utilizes electrolytic system, centrifugal separation system, dehumidification system, filtering system, this invention silicon powder-containing waste component is different from the utility model, also containing SiC outside removing silicon powder, polyoxyethylene glycol, tensio-active agent.
Summary of the invention
The technical problems to be solved in the utility model is: in silicon powder-containing waste water, the particle diameter of silica flour is less, and long-time leaving standstill is not precipitated, and traditional treatment process effect is bad, and existing method cost is higher.
The purpose of this utility model is to provide a kind for the treatment of unit containing superfine silica powder waste water, described device comprises wastewater collection pond 1, flocculation sedimentation tank 2, alkali lye pond 3, pressure filter 4, service water collecting tank 5, alkaline water collecting tank 6, chlorosilane waste gas drip washing equipment 7, agitator I 8, agitator II 9, wastewater collection pond 1, alkali lye pond 3 are connected with flocculation sedimentation tank 2 respectively by pump, and the lower end of flocculation sedimentation tank 2 is communicated with pressure filter 4 by pump, upper end is communicated with alkaline water collecting tank 6; Alkaline water collecting tank 6 is communicated with alkali lye pond 3, service water collecting tank 5 by pump, and service water collecting tank 5 is connected with chlorosilane waste gas drip washing equipment 7 by pump; Flocculation sedimentation tank 2, inside, alkali lye pond 3 are respectively equipped with agitator I 8 and agitator II 9, are equipped with valve between each parts be connected.
The use procedure of device described in the utility model is:
(1) waste water (granularity of silica flour is 0.1 ~ 1 μm) containing superfine silica powder is passed in wastewater collection pond 1, then the waste water containing superfine silica powder is passed in flocculation sedimentation tank 2;
(2) be pumped in flocculation sedimentation tank 2 by precipitation agent NaOH solution (mass percent is 20 ~ 32%) by alkali lye pond 3, controlling stirrer rotating speed is 10 ~ 20r/min; The pH value controlling flocculation sedimentation tank 2 liquid be 12 ~ 13.5 and the reaction times be that 30 ~ 90min forms supernatant layer and the beds of precipitation;
(3) flocculation sedimentation tank 2 upper supernatant layer enters alkaline water collecting tank 6; An alkaline water part in alkaline water collecting tank 6 turns back to alkali lye pond 3 as circulation alkaline water, for preparing precipitant solution, remaining part is transported in service water collecting tank 5, then sends in chlorosilane waste gas drip washing equipment 7 as the absorption agent in chlorosilane waste gas lessivation;
(4) flocculation sedimentation tank 2 bottom settlings thing is transported in pressure filter 4 and carries out press filtration, and filter residue directly transports slag storehouse to, and filtrate enters alkaline water collecting tank 6.
Chlorosilane waste gas drip washing operation described in the utility model refer to from trichlorosilane synthesis procedure, trichlorosilane rectification and purification operation and trichlorosilane reduction operation produce containing SiH
2cl
2, SiHCl
3and SiCl
4the technological process of spray-absorption process is carried out Deng waste gas alkali lye.
The beneficial effects of the utility model: the cost reducing silicon powder-containing wastewater treatment, the recycling of alkaline water after convenient process, by the alkaline water produced after process silicon powder-containing waste water, a part turns back to alkali lye pond and continues to prepare water used as precipitation agent, another part, as the absorption agent of chlorosilane off gas treatment operation, realizes the recycling of alkali and water.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present utility model;
In figure: 1-wastewater collection pond; 2-flocculation sedimentation tank; 3-alkali lye pond; 4-pressure filter; 5-service water collecting tank; 6-alkaline water collecting tank; 7-chlorosilane waste gas drip washing equipment; 8-agitator I; 9-agitator II.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but protection domain of the present utility model is not limited to described content.
Embodiment 1
Containing the treatment unit of superfine silica powder waste water described in the present embodiment, described device comprises wastewater collection pond 1, flocculation sedimentation tank 2, alkali lye pond 3, pressure filter 4, service water collecting tank 5, alkaline water collecting tank 6, chlorosilane waste gas drip washing equipment 7, agitator I 8, agitator II 9, wastewater collection pond 1, alkali lye pond 3 are connected with flocculation sedimentation tank 2 respectively by pump, and the lower end of flocculation sedimentation tank 2 is communicated with pressure filter 4 by pump, upper end is communicated with alkaline water collecting tank 6; Alkaline water collecting tank 6 is communicated with alkali lye pond 3, service water collecting tank 5 by pump, and service water collecting tank 5 is connected with chlorosilane waste gas drip washing equipment 7 by pump; Flocculation sedimentation tank 2, inside, alkali lye pond 3 are respectively equipped with agitator I 8 and agitator II 9, are equipped with valve between each parts be connected.
Containing the use procedure of the treatment unit of superfine silica powder waste water described in the present embodiment, comprise the following steps:
(1) waste water (granularity of silica flour is 0.1 ~ 1 μm) containing superfine silica powder is collected in silicon-containing wastewater collecting tank 1, then the waste water containing superfine silica powder is passed in flocculation sedimentation tank 2;
(2) be pumped in flocculation sedimentation tank 2 by precipitation agent NaOH solution (mass percent is 20%) by alkali lye pond 3, control agitator speed is 10r/min; The pH value controlling flocculation sedimentation tank 2 liquid be 12.81 and the reaction times be that 30min forms supernatant layer and the beds of precipitation;
(3) flocculation sedimentation tank 2 upper supernatant layer enters alkaline water collecting tank 6; An alkaline water part in alkaline water collecting tank 6 turns back to alkali lye pond 3 as circulation alkaline water, for preparing precipitant solution, remaining part is transported in service water collecting tank 5, then sends in chlorosilane waste gas drip washing equipment 7 as the absorption agent in chlorosilane waste gas lessivation;
(4) flocculation sedimentation tank 2 bottom settlings thing is transported in pressure filter 4 and carries out press filtration, and filter residue directly transports slag storehouse to, and filtrate enters alkaline water collecting tank 6;
The leading indicator of the silicon-containing wastewater after the present embodiment process is in table 1, and clearly the suspended substance (SS) of waste water and turbidity all meet enterprise's recycle water standard, may be used for production of polysilicon enterprise chlorosilane waste gas absorption.
index before and after the wastewater treatment of table 1. silicon powder-containing
。
Claims (1)
1. the treatment unit containing superfine silica powder waste water, it is characterized in that: described device comprises wastewater collection pond (1), flocculation sedimentation tank (2), alkali lye pond (3), pressure filter (4), service water collecting tank (5), alkaline water collecting tank (6), chlorosilane waste gas drip washing equipment (7), agitator I (8), agitator II (9), wastewater collection pond (1), alkali lye pond (3) are connected with flocculation sedimentation tank (2) respectively by pump, and the lower end of flocculation sedimentation tank (2) is communicated with pressure filter (4) by pump, upper end is communicated with alkaline water collecting tank (6); Alkaline water collecting tank (6) is communicated with alkali lye pond (3), service water collecting tank (5) by pump, and service water collecting tank (5) is connected with chlorosilane waste gas drip washing equipment (7) by pump; Flocculation sedimentation tank (2), alkali lye pond (3) inside are respectively equipped with agitator I (8) and agitator II (9), are equipped with valve between each parts be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520047629.1U CN204550266U (en) | 2015-01-23 | 2015-01-23 | A kind for the treatment of unit containing superfine silica powder waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520047629.1U CN204550266U (en) | 2015-01-23 | 2015-01-23 | A kind for the treatment of unit containing superfine silica powder waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204550266U true CN204550266U (en) | 2015-08-12 |
Family
ID=53825402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520047629.1U Expired - Fee Related CN204550266U (en) | 2015-01-23 | 2015-01-23 | A kind for the treatment of unit containing superfine silica powder waste water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204550266U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104671498A (en) * | 2015-01-23 | 2015-06-03 | 昆明理工大学 | Treatment method and device of wastewater containing superfine silicon powder |
-
2015
- 2015-01-23 CN CN201520047629.1U patent/CN204550266U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104671498A (en) * | 2015-01-23 | 2015-06-03 | 昆明理工大学 | Treatment method and device of wastewater containing superfine silicon powder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150812 Termination date: 20170123 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |