CN103771603A - Recycling method of water in silicon carbide production - Google Patents
Recycling method of water in silicon carbide production Download PDFInfo
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- CN103771603A CN103771603A CN201410014850.7A CN201410014850A CN103771603A CN 103771603 A CN103771603 A CN 103771603A CN 201410014850 A CN201410014850 A CN 201410014850A CN 103771603 A CN103771603 A CN 103771603A
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- silicon carbide
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Abstract
The invention provides a recycling method of water in silicon carbide production. The method comprises the following steps: (1) naturally precipitating; (2) carrying out secondary treatment by a filter press, wherein the working temperature of the filter press is 5-60 DEG C and the pressure is less than 0.6Mpa; and (3) further filtering by an ultrafiltration system, wherein the working temperature is 5-40 DEG C, the pressure is less than 0.25Mpa, the effluent turbidity is less than 1NTU (Number of Transfer Units), the pH value is ranged from 5.5 to 7, and the conductivity is less than 20 microsecond/cm. The recycling method of water in silicon carbide production provided by the invention recycles water, saves the cost and protects the environment, and has the advantages of less investment cost, remarkable profit effect, simplicity in use of equipment and the like.
Description
Technical field
The present invention relates to chemical field, relate in particular to the reuse method of water in a kind of silicon carbide production.
Background technology
Silicon carbide is industry and the indispensable important source material of photovoltaic, utilization in industry very extensively, be called as " tooth of industry ", in photovoltaic industry, also there is irreplaceable effect simultaneously, in fossil energy day by day exhausted today, sun power as the one of new forms of energy in continuous development, and more and more important! Two silicon carbide are exactly indispensable part in photovoltaic industry chain.
The water conservancy classification of silicon carbide has two kinds of siphonage and presss over system, and production process all needs a large amount of water, is all an acid test to production cost and environment.In existing production technology, a lot of water of productive use are all directly to drain, so cause the unit consumption of production silicon carbide water high, produce the water yield that one ton of silicon carbide needs large, thereby cause the increase of the auxiliary facility (such as well, draw water, pure water processed) of production.
Summary of the invention
The object of the invention is to solve the defect that above-mentioned prior art exists, a kind of recovery method that reclaims a large amount of waste water that produce in silicon carbide preparation process is provided.
A reuse method for water in silicon carbide production, comprises the following steps:
(1), natural sedimentation;
(2), utilize pressure filter to carry out secondary treatment, pressure filter working temperature is at 5-60 degree, pressure is less than 0.6Mpa;
(3), further filter through ultrafiltration system, working temperature is 5-40 degree, and pressure is less than 0.25Mpa, and delivery turbidity is less than 1NTU, pH value 5.5 to 7, and specific conductivity is less than 20 μ s/cm.
Further, the silicon carbide producing in step (2) and (3) filtration procedure is reclaimed.
The present invention has following advantage:
1. the recycling of water, cost-saving, protection of the environment.
2. practical the inventive method reclaims the waste water producing in silicon carbide production, has cost of investment little, income successful, and equipment uses the advantages such as simple.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below the technical scheme in the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
(1) waste water producing in silicon carbide production is passed into settling tank and carry out natural sedimentation, extract upper strata clear water and enter next program; (2) clear water extracting after precipitation is passed into pressure filter and carry out secondary treatment, pressure filter working temperature is 5 degree, and pressure is 0.6Mpa; (3) will enter pressure filter water after treatment and pass into ultrafiltration system and further filter, the working temperature of ultrafiltration system is 5 degree, and pressure is 0.25Mpa, detects water turbidity.Delivery turbidity is that 0.75NTU, pH value are 6.3 after testing, and specific conductivity is 20 μ s/cm.Visible, by the inventive method processed waste water, can realize recycling completely.In addition, the silicon carbide producing in step (2) and (3) filtration procedure can also be reclaimed.
Embodiment 2:
(1) waste water producing in silicon carbide production is passed into settling tank and carry out natural sedimentation, extract upper strata clear water and enter next program; (2) clear water extracting after precipitation is passed into pressure filter and carry out secondary treatment, pressure filter working temperature is 30 degree, and pressure is 0.1Mpa; (3) will enter pressure filter water after treatment and pass into ultrafiltration system and further filter, the working temperature of ultrafiltration system is 30 degree, and pressure is 0.1Mpa, detects water turbidity.Delivery turbidity is that 0.73NTU, pH value are 6.8 after testing, and specific conductivity is 13 μ s/cm.Visible, by the inventive method processed waste water, can realize recycling completely.In addition, the silicon carbide producing in step (2) and (3) filtration procedure can also be reclaimed.
Embodiment 3:
(1) waste water producing in silicon carbide production is passed into settling tank and carry out natural sedimentation, extract upper strata clear water and enter next program; (2) clear water extracting after precipitation is passed into pressure filter and carry out secondary treatment, pressure filter working temperature is 60 degree, and pressure is 0.2Mpa; (3) will enter pressure filter water after treatment and pass into ultrafiltration system and further filter, the working temperature of ultrafiltration system is 40 degree, and pressure is 0.18Mpa, detects water turbidity.Delivery turbidity is that 0.65NTU, pH value are 7.0 after testing, and specific conductivity is 11 μ s/cm.Visible, by the inventive method processed waste water, can realize recycling completely.In addition, the silicon carbide producing in step (2) and (3) filtration procedure can also be reclaimed.
The present invention after the precipitation of settling tank, first separates the water of separating the particle that can precipitate.After pressure filter press filtration or after whizzer separates, again filter the more particle of small grain size afterwards, then further filter through ultrafiltration system, just can reach the water that makes of silicon carbide hydraulic classification standard, thereby reach the reuse of the water of silicon carbide hydraulic classification.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (2)
1. a reuse method for water in silicon carbide production, is characterized in that, comprises the following steps:
(1), natural sedimentation;
(2), utilize pressure filter to carry out secondary treatment, pressure filter working temperature is at 5-60 degree, pressure is less than 0.6Mpa;
(3), further filter through ultrafiltration system, working temperature is 5-40 degree, and pressure is less than 0.25Mpa, and delivery turbidity is less than 1NTU, pH value 5.5 to 7, and specific conductivity is less than 20 μ s/cm.
2. the reuse method of water in silicon carbide production according to claim 1, is characterized in that, the silicon carbide producing in step (2) and (3) filtration procedure is reclaimed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410014850.7A CN103771603A (en) | 2014-01-14 | 2014-01-14 | Recycling method of water in silicon carbide production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410014850.7A CN103771603A (en) | 2014-01-14 | 2014-01-14 | Recycling method of water in silicon carbide production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103771603A true CN103771603A (en) | 2014-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410014850.7A Pending CN103771603A (en) | 2014-01-14 | 2014-01-14 | Recycling method of water in silicon carbide production |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101032806A (en) * | 2006-03-06 | 2007-09-12 | 张捷平 | Method of recycling cutting suspension |
| CN101474511A (en) * | 2008-12-17 | 2009-07-08 | 西安交通大学 | Process for recovering polyethylene glycol and silicon carbide in waste mortar from silicon wafer wire cutting |
| CN102268324A (en) * | 2011-07-15 | 2011-12-07 | 山西天能科技股份有限公司 | Method for recovering cutting liquid, SiC powder and Si powder from waste mortar |
| CN102745777A (en) * | 2012-07-11 | 2012-10-24 | 山东博洋环境资源有限公司 | Zero-emission processing method of silicon-carbide micropowder wastewater |
| KR101333677B1 (en) * | 2013-06-11 | 2013-12-02 | 아태수기엔지니어링(주) | A defecator using the membrane with silicon carbide material for waste liquid |
-
2014
- 2014-01-14 CN CN201410014850.7A patent/CN103771603A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101032806A (en) * | 2006-03-06 | 2007-09-12 | 张捷平 | Method of recycling cutting suspension |
| CN101474511A (en) * | 2008-12-17 | 2009-07-08 | 西安交通大学 | Process for recovering polyethylene glycol and silicon carbide in waste mortar from silicon wafer wire cutting |
| CN102268324A (en) * | 2011-07-15 | 2011-12-07 | 山西天能科技股份有限公司 | Method for recovering cutting liquid, SiC powder and Si powder from waste mortar |
| CN102745777A (en) * | 2012-07-11 | 2012-10-24 | 山东博洋环境资源有限公司 | Zero-emission processing method of silicon-carbide micropowder wastewater |
| KR101333677B1 (en) * | 2013-06-11 | 2013-12-02 | 아태수기엔지니어링(주) | A defecator using the membrane with silicon carbide material for waste liquid |
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Application publication date: 20140507 |