CN107697917A - A kind of silicon carbide micro-powder recovery method - Google Patents
A kind of silicon carbide micro-powder recovery method Download PDFInfo
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- CN107697917A CN107697917A CN201610491308.XA CN201610491308A CN107697917A CN 107697917 A CN107697917 A CN 107697917A CN 201610491308 A CN201610491308 A CN 201610491308A CN 107697917 A CN107697917 A CN 107697917A
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- disposed slurry
- silicon carbide
- alkali cleaning
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Abstract
The present invention relates to a kind of silicon carbide micro-powder recovery method, including step：Add water to use supersonic filter screening and filtering after being sufficiently stirred raw material to be recycled, obtain filtering disposed slurry；Alkaline matter is put into after filtering disposed slurry is sufficiently stirred and carries out alkali cleaning, obtains alkali cleaning disposed slurry；Acidic materials are put into after alkali cleaning disposed slurry is sufficiently stirred and carry out pickling, obtain pickling disposed slurry；Pickling disposed slurry is rinsed, obtains rinsing disposed slurry；Drying dehydration is carried out to rinsing disposed slurry, and dries acquisition finished product.Silicon carbide micro-powder recovery method of the present invention, technological process is simple, easy to operate, and cost is low, and recovery benefit is higher；Screening and filtering is sieved especially with ultrasonic activation, finished product is scattered, does not unite, epigranular, without impurity.
Description
Technical field
The invention belongs to silicon carbide micro-powder production technical field, and in particular to a kind of silicon carbide micro-powder recovery side
Method.
Background technology
Silicon rod cutting all uses the multi-wire slicing machine of free abrasive particle, and it is straight by many of sheave traction
The cutting wire (steel wire) of the millimeter of footpath 0.12 quickly moves on silicon rod, and by " diamond dust "
With the collective effect such as the grinding, carrying, cooling of " cutting liquid ", by 6~12 inches of polycrystalline silicon rods of diameter
Once cut into hundreds of even thousands of equidimension silicon chips that thickness is 0.12~0.20 millimeter.
In the cutting process of cutting on line machine, substantial amounts of cutting liquid and carborundum can be used, and with cutting
The silicon rod fine powder (silica flour) to get off is mixed in together, forms substantial amounts of waste mortar.The annual whole nation is all
Waste mortar caused by silicon chip cutting producer has hundreds of thousands ton, and waste mortar recycles the disposal ability of producer
It is again limited so that quite a few waste mortar cannot be dealt carefully with, and cause the wasting of resources and environmental pollution,
It is much to be regretted.
Waste mortar recycling general procedure is by separation of solid and liquid at present, and solid waste is that recycling includes carbon
The raw material of SiClx micro mist, slurrying, alkali cleaning, pickling, rinsing, drying etc. are then carried out to solid waste
Step obtains silicon carbide micro-powder, and complex process, cost recovery are high, and often due to purity not enough causes
The silicon carbide micro-powder of recovery is difficult to the technical standard for reaching solar energy crystal silicon wafer cutting edge material.
The content of the invention
A kind of silicon carbide micro-powder recovery side is provided it is an object of the invention to solve above-mentioned technical problem
Method.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of silicon carbide micro-powder recovery method, comprises the following steps：
Add water to use supersonic filter screening and filtering after being sufficiently stirred raw material to be recycled, starched after being filtered
Material；
Alkaline matter is put into after filtering disposed slurry is sufficiently stirred and carries out alkali cleaning, is obtained alkali cleaning disposed slurry, is made
Alkali cleaning disposed slurry pH value≤9.0, carborundum content >=98%；
Acidic materials are put into after alkali cleaning disposed slurry is sufficiently stirred and carry out pickling, obtain pickling disposed slurry；
Pickling disposed slurry is rinsed, obtains rinsing disposed slurry, washes disposed slurry pH value as 7.5~8.5；
Drying dehydration is carried out to rinsing disposed slurry, and dries acquisition finished product.
The alkaline matter is sodium hydroxide, purity 98%.
The acidic materials are the solution of the hydrochloric acid that concentration is 20-30% or sulfuric acid, the hydrochloric acid or sulfuric acid
The ratio of solution is the 5%~8% of alkali cleaning disposed slurry.
Silicon carbide micro-powder recovery method of the present invention, technological process is simple, easy to operate, and cost is low, recovery
Benefit is higher；Screening and filtering is sieved especially with ultrasonic activation, finished product is scattered, does not unite, granularity
Uniformly, without impurity.
Embodiment
Below, the substantive distinguishing features and advantage of the present invention are further described with reference to example, but this hair
It is bright to be not limited to listed embodiment.
A kind of silicon carbide micro-powder recovery method, comprises the following steps：
Add water to use supersonic filter screening and filtering after being sufficiently stirred raw material to be recycled, starched after being filtered
Material；
Alkaline matter is put into after filtering disposed slurry is sufficiently stirred and carries out alkali cleaning, is obtained alkali cleaning disposed slurry, is made
Alkali cleaning disposed slurry pH value≤9.0, carborundum content >=98%；
Acidic materials are put into after alkali cleaning disposed slurry is sufficiently stirred and carry out pickling, obtain pickling disposed slurry；
Pickling disposed slurry is rinsed, obtains rinsing disposed slurry, washes disposed slurry pH value as 7.5~8.5；
Drying dehydration is carried out to rinsing disposed slurry, and dries acquisition finished product.
The alkaline matter is sodium hydroxide, purity 98%.
The acidic materials are the solution of the hydrochloric acid that concentration is 20-30% or sulfuric acid, the hydrochloric acid or sulfuric acid
The ratio of solution is the 5%~8% of alkali cleaning disposed slurry.
Silicon carbide micro-powder recovery method of the present invention, technological process is simple, easy to operate, and cost is low, recovery
Benefit is higher；Screening and filtering is sieved especially with ultrasonic activation, finished product is scattered, does not unite, granularity
Uniformly, without impurity.
Described above is only the preferred embodiment of the present invention, it is noted that for the art
For those of ordinary skill, under the premise without departing from the principles of the invention, can also make it is some improvement and
Retouching, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of silicon carbide micro-powder recovery method, it is characterised in that comprise the following steps：
Add water to use supersonic filter screening and filtering after being sufficiently stirred raw material to be recycled, starched after being filtered
Material；
Alkaline matter is put into after filtering disposed slurry is sufficiently stirred and carries out alkali cleaning, is obtained alkali cleaning disposed slurry, is made
Alkali cleaning disposed slurry pH value≤9.0, carborundum content >=98%；
Acidic materials are put into after alkali cleaning disposed slurry is sufficiently stirred and carry out pickling, obtain pickling disposed slurry；
Pickling disposed slurry is rinsed, obtains rinsing disposed slurry, washes disposed slurry pH value as 7.5~8.5；
Drying dehydration is carried out to rinsing disposed slurry, and dries acquisition finished product.
2. silicon carbide micro-powder recovery method according to claim 1, it is characterised in that the basic species
Matter is sodium hydroxide, purity 98%.
3. silicon carbide micro-powder recovery method according to claim 1, it is characterised in that the acid
Matter is the solution of the hydrochloric acid that concentration is 20-30% or sulfuric acid, and the ratio of the solution of the hydrochloric acid or sulfuric acid is alkali
Wash the 5%~8% of disposed slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610491308.XA CN107697917A (en) | 2016-06-22 | 2016-06-22 | A kind of silicon carbide micro-powder recovery method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610491308.XA CN107697917A (en) | 2016-06-22 | 2016-06-22 | A kind of silicon carbide micro-powder recovery method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107697917A true CN107697917A (en) | 2018-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610491308.XA Pending CN107697917A (en) | 2016-06-22 | 2016-06-22 | A kind of silicon carbide micro-powder recovery method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107265459A (en) * | 2017-07-31 | 2017-10-20 | 江苏乐园新材料集团有限公司 | A kind of chemical purification methods of silicon carbide micro-powder |
| CN114314592A (en) * | 2021-12-31 | 2022-04-12 | 常州赛蓝光伏技术有限公司 | Purification method and filtering device for recovering silicon carbide micro powder from waste mortar generated in cutting silicon |
-
2016
- 2016-06-22 CN CN201610491308.XA patent/CN107697917A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107265459A (en) * | 2017-07-31 | 2017-10-20 | 江苏乐园新材料集团有限公司 | A kind of chemical purification methods of silicon carbide micro-powder |
| CN114314592A (en) * | 2021-12-31 | 2022-04-12 | 常州赛蓝光伏技术有限公司 | Purification method and filtering device for recovering silicon carbide micro powder from waste mortar generated in cutting silicon |
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Application publication date: 20180216 |
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| WD01 | Invention patent application deemed withdrawn after publication |