CN101623693A - Method for carrying out color sorting and separation of silicon materials with color difference - Google Patents
Method for carrying out color sorting and separation of silicon materials with color difference Download PDFInfo
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Abstract
The invention relates to a method for sorting silicon materials in the fields of a semiconductor and solar energy, in particular to a method for carrying out the color sorting and separation of silicon materials with color difference. The method is especially applied to the sorting of a remixed silicon material and a normal silicon material which are mixed together and have a color difference. The gray normal silicon material and the non-gray remixed silicon material are separated by a color sorting method. Concretely, the silicon materials with the color difference are fed into a color sorting machine; color sorting is carried out; and the non-gray remixed silicon material falls into a discharge hopper of the remixed silicon material, the gray normal silicon material falls into a discharge hopper of the normal silicon material, and the separation of the non-gray remixed silicon material and the gray normal silicon material is realized. The reflectivity of the normal silicon material to light is 50-80%, and the reflectivity of the non-gray remixed silicon material to the light is 10-30%. The invention realizes the automatization of the sorting of the remixed silicon material and the normal silicon material which are mixed together and have the color difference. The invention can efficiently substitute a traditional manual sorting method.
Description
Technical field
The present invention relates to the method for separating of a kind of silicon material of semiconductor and field of solar energy, the look of the discrepant silicon material of particularly a kind of color selects separation method, and this method is applied to discrepant heavily doped silicon material of the color that mixes and normal silicon material are carried out sorting especially.
Background technology
The recovery of useless silicon material mainly is meant the recovery of the discarded object that contains silicon that occurs in semiconductor and the photovoltaic processing.The target that useless silicon material reclaims is meant separates silicon and cleans out from discarded object, make its raw material that can be used as photovoltaic cell, thereby reduce raw-material cost.Be mixed with a lot of impurity in the useless silicon material that reclaims, at first must carry out sorting it.It is wherein a kind of that the silicon material that is mixed with heavily doped silicon material is exactly useless silicon material.Heavily doped silicon material generally is meant because element impurity such as the B, the P that mix, Ga, Al, As make resistivity less than the silicon material of 0.5 Ω .cm, because the impurity content height can't use as the silicon raw material, the resistivity of normal silicon material is generally more than 0.5 Ω .cm.Come sorting to be mixed with the conventional method of the silicon material of heavily doped silicon material in order to change the resistivity value of utilizing resistivity tester to measure the silicon material, especially for the silicon material of small particle diameter, resistivity tester can't detect at all, recently processing method is that the silicon material that will be mixed with heavily doped silicon material utilizes chemical method or physical method or heavily doped silicon material colour developing chemical and that physical method combines and will wherein be mixed with, and the normal silicon material color can not change, the color that specifically is meant be untreated preceding heavily doped silicon material and normal silicon material is grey, there is not the difference on any color, through the processing that combines of chemical method or physical method or chemistry and physical method, heavily doped silicon material colour developing, usually the heavily doped silicon material of P type shows blueness or black, the heavily doped silicon material of N type shows yellow, normal silicon material still still shows grey, forms the discrepant heavily doped silicon material of color and the normal silicon material that mix.
Method for separating for discrepant heavily doped silicon material of these colors that mix and normal silicon material mainly is to rely on artificial naked eyes to judge at present, undertaken by grain ground piecewise, this method for separating need consume a large amount of labours, makes the recovery industry of useless silicon material become labor-intensive production.Especially for the silicon material of particle diameter less than 5mm, adopt artificial separation, not only expend sizable manpower, and the efficiency of separation is low, on average sorting silicon material amount only has 1-3Kg for each person every day, and this obviously is disadvantageous for reducing life cycle of the product.
Summary of the invention
The object of the present invention is to provide a kind of high efficiency method of the discrepant silicon material of color being carried out look choosing separation.
The technical solution used in the present invention is:
A kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the discrepant silicon material of described color is meant the heavily doped silicon material of the normal silicon material and the non-grey of grey, by colour-selection technique the normal silicon material of grey is separated with the heavily doped silicon material of non-grey.The heavily doped silicon material of non-grey is generally blueness, black or yellow, and the heavily doped silicon material of P type is blueness or black usually, and the heavily doped silicon material of N type is yellow.
A kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the operating procedure of colour-selection technique is:
(1) the discrepant silicon material of color is dropped in the color selector;
(2) look choosing;
(3) the heavily doped silicon material of non-grey falls into heavily doped silicon material discharge bucket, and the normal silicon material of grey falls into the normal silicon material discharge bucket,
The heavily doped silicon material of realizing non-grey separates with the normal silicon material of grey.
A kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: described normal silicon material is 50%-80% to the reflection of light rate, the heavily doped silicon material of non-grey is 10%-30% to the reflection of light rate.
Reflectivity values described in the present invention is to utilize spectrometry that architectural plane glassware albedo measurement and calculating are obtained with standard method of test according to the ASTM-E-1585-1993 of American Society Testing and Materials; Also can obtain by the reflectance test instrument of other any kinds.
A kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the gray value of described normal silicon material is 65-80, the gray value of the heavily doped silicon material of non-grey is 85-120.Gray value is that the silicon material is mapped to the catoptrical gray scale what form on the silicon material through illumination.Color difference, gray value are just different.The gray value height represents that then reverberation is few, and promptly reflectivity is low, on the contrary the reflectivity height.
A kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: described color selector is to contain feeding system, optical detection system, separation system and control system.
Feeding machanism generally includes members such as hopper and feed appliance.The effect of hopper is to store supplied materials, guarantees that the silicon material of the selected heavily doped silicon material that is mixed with non-grey flows into feed appliance evenly, continuously.The feed appliance dispensing is mixed with the silicon materials flow of the heavily doped silicon material of non-grey and arrives optic testing system.The feeding style of feed appliance comprises waterfall type and channel-type, generally adopt the separation velocity of waterfall type to be higher than the channel-type sorting, but the sharpness of separation of waterfall type is poor with respect to the sharpness of separation of channel-type.
The optical detection system is the key component of color selector, and its effect is that tested material is observed detection, to obtain sorting information accurately.
After control system was meant and treats that the optical detection system draws the discrepant signal of color, control system can be sent instruction according to signal, drove separation system and carried out sorting.
Separation system mainly is meant the air-flow spraying system.The air-flow spraying system mainly be meant steam jet atomizer and some auxiliary equipment, as air compressor machine, dried-air drier etc.Steam jet atomizer is the key of air-flow spraying system, after the controlled system drive of separation system, it is quick opening of valves, steam jet atomizer penetrates high velocity air, the heavily doped silicon material of non-grey is blown out, and send into by discharge mechanism in the discharge bucket of heavily doped silicon material of non-grey, and when running into the normal silicon material of grey, separation system can not be driven, and normal silicon material continues to fall, and enters by discharge mechanism in the discharge bucket of normal silicon material.
A kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the operating procedure of colour-selection technique is:
(1) the discrepant silicon material of color is dropped into feeding system;
(2) optical detection system carries out optical detection to the discrepant silicon material of the color in the feeding system;
(3) color distortion of optical detection system identification silicon material;
(4) signal of the color distortion of optical detection system identification silicon material sends control system to;
(5) control system drives separation system according to the signal of color distortion, and the discrepant silicon material of color is separated.
A kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the operating procedure of colour-selection technique is:
(1) the discrepant silicon material of color is dropped into feeding system;
(2) optical detection system carries out optical detection to the discrepant silicon material of the color in the feeding system;
(3) color distortion of optical detection system identification silicon material;
(4) signal of the color distortion of optical detection system identification silicon material sends control system to;
(5) control system is according to the signal of color distortion, drives separation system, and the heavily doped silicon material of non-grey is separated with the normal silicon material of grey.
A kind of the discrepant silicon material of color is carried out the method that look choosing separates, wherein: the detection mode of described optical detection system is any one that monochromatic light detects, bi-coloured light detects, duplex monochromatic light detects.
Adopt one section spectrum that material is detected the method for sorting, be called monochromatic light and detect.Adopt two sections spectrum that material is detected the method for sorting, be called bi-coloured light and detect, bi-coloured light detects general more complicated.Also can adopt duplex monochromatic light to detect, be meant and use two sections spectrum one by one, the defective product of successively rejecting two kinds of different optical characteristics respectively, for example: in the look choosing of the discrepant heavily doped silicon material of color and normal silicon material separates, can reject the yellow heavily doped silicon material of N type earlier and reject the heavily doped silicon material of P type of blueness or black again, or the heavily doped silicon material of P type of elder generation's rejecting blueness or black is rejected the yellow heavily doped silicon material of N type again.
A kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the sorting mode of separation system is to adopt to open quick valve the winding-up sorting.
A kind of the discrepant silicon material of color is carried out the method that look choosing separates, wherein: the feeding speed of described feeding system be the 0.1-12 ton/hour.
A kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the mouthpiece diameter of described separation system is 0.1 millimeter-10 millimeters.
Separation system can be according to the instruction of control system, when running into the discrepant signal of color, control system drives separation system according to this difference signal, open the mouthpiece that quick valve is formed for the steam jet atomizer winding-up, steam jet atomizer penetrates high velocity air, when the particle diameter of the heavily doped silicon material of non-grey is equal to or less than the mouthpiece diameter, the heavily doped silicon material of non-grey can be jetted away by high velocity air, and when the particle diameter of the heavily doped silicon material of non-grey during greater than the mouthpiece diameter, the heavily doped silicon material of non-grey cannot be jetted away by high velocity air.
A kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the open frequency of the quick valve in the described separation system is 0-1000 time/second.
When running into the heavily doped silicon material of non-grey, the steam jet atomizer of separation system is driven, and valve is opened fast, and the maximum open frequency of valve can reach 1000 times/second fast.
Operation principle of the present invention: normal silicon material is 50%-80% to the reflection of light rate, the heavily doped silicon material of non-grey is 10%-30% to the reflection of light rate, because the reflectivity of the heavily doped silicon material of non-grey and the reflectivity of normal silicon material are variant, can cause the measured value generation difference in the optical detection system of normal silicon material in color selector of the heavily doped silicon material of non-grey and grey, control system drives the separation system root according to this difference signal and carries out sorting, realizes that the normal silicon material of grey is separated with the heavily doped silicon material of non-grey.With the detection mode is that the monochromatic a kind of color selector that detects is an example, and the gray value of normal silicon material is 65-80, and the gray value of the heavily doped silicon material of non-grey is 85-120, and in general high more to the reflection of light rate, gray value is low more.Import the gray value of normal silicon material in the color selector in advance, selected silicon material falls into optical tester by feeding system, be mixed be reflected in optical tester in the colorimetric of the normal silicon material of the heavily doped silicon material of non-grey and grey to reflection of light and radiation shield, when running into the normal silicon material of grey, because its gray value is identical with gray value in the optic testing system of importing color selector in advance, separation system can controlled system drive, normal silicon material continues to fall, and falls into the normal silicon material feeder by discharge mechanism; And when running into the heavily doped silicon material of non-grey, because its gray value is different with the gray value in the optic testing system of importing color selector in advance, control system is according to this color distortion signal, drive separation system and open quick valve, steam jet atomizer penetrates high velocity air, the heavily doped silicon material of non-grey blown out and fall into the feeder of the heavily doped silicon material of non-grey by discharge mechanism, the heavily doped silicon material of realizing non-grey separates with the normal silicon material of grey.
Adopt technical scheme of the present invention to compare with conventional solution, can observed experiment effect as follows:
Advantage of the present invention: provided by the inventionly a kind ofly the discrepant silicon material of color is carried out the method that look choosing separates replaced traditional artificial separation method, efficiency of separation height, and realized the automation of the sorting of discrepant heavily doped silicon material of the color that mixes and normal silicon material.
The specific embodiment
Embodiment 1, a kind of method of the discrepant silicon material of color being carried out look choosing separation, wherein: the discrepant silicon material of described color is meant the heavily doped silicon material of the normal silicon material and the non-grey of grey, by colour-selection technique the normal silicon material of grey is separated with the heavily doped silicon material of non-grey.
Embodiment 2, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein said normal silicon material is 50%-80% to the reflection of light rate, and the heavily doped silicon material of non-grey is 10%-30% to the reflection of light rate, and all the other are with embodiment 1.
Embodiment 3, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the operating procedure of colour-selection technique is:
(1) the discrepant silicon material of color is dropped in the color selector;
(2) look choosing;
(3) the heavily doped silicon material of non-grey falls into heavily doped silicon material discharge bucket, and the normal silicon material of grey falls into the normal silicon material discharge bucket, realizes that the heavily doped silicon material of non-grey separates with the normal silicon material of grey, and all the other are with embodiment 1, embodiment 2.
Embodiment 4, a kind of method of the discrepant silicon material of color being carried out look choosing separation, wherein: described color selector is any one of color selector that contains feeding system, optical detection system, separation system and control system, and all the other are respectively with embodiment 1, embodiment 2, embodiment 3.
Embodiment 5, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the operating procedure that the look choosing separates is:
(1) the discrepant silicon material of color is dropped into feeding system;
(2) optical detection system carries out optical detection to the discrepant silicon material of the color in the feeding system;
(3) color distortion of optical detection system identification silicon material;
(4) signal of the color distortion of optical detection system identification silicon material sends control system to;
(5) control system is according to the signal of color distortion, drives separation system, and it can be that heavily doped silicon material with non-grey separates with the normal silicon material of grey that the discrepant silicon material of color is separated.All the other are respectively with any one embodiment among the embodiment 1-4.
Embodiment 6, a kind of the discrepant silicon material of color is carried out the method that look choosing separates, wherein: the detection mode of described optical detection system is that monochromatic light detects, and all the other are respectively with embodiment 4, embodiment 5.
Embodiment 7, a kind of the discrepant silicon material of color is carried out the method that look choosing separates, wherein: the detection mode of described optical detection system is that bi-coloured light detects, and all the other are respectively with embodiment 4, embodiment 5.
Embodiment 8, a kind of the discrepant silicon material of color is carried out the method that look choosing separates, wherein: the detection mode of described optical detection system is that duplex monochromatic light detects, and all the other are respectively with embodiment 4, embodiment 5.
Embodiment 9, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the sorting mode of separation system is to adopt to open quick valve, the winding-up sorting, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 10, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the feeding speed of described feeding system is 0.1 hour, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 11, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the feeding speed of described feeding system is 1 ton/hour, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 12, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the feeding speed of described feeding system is 3 tons/hour, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 13, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the feeding speed of described feeding system is 5 tons/hour, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 14, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the feeding speed of described feeding system is 8 tons/hour, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 15, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the feeding speed of described feeding system is 10 tons/hour, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 16, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the feeding speed of described feeding system is 12 tons/hour, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 17, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the mouthpiece diameter of described separation system is 0.1 millimeter, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 18, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the mouthpiece diameter of described separation system is 0.5 millimeter, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 19, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the mouthpiece diameter of described separation system is 1 millimeter, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 20, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the mouthpiece diameter of described separation system is 3 millimeters, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 21, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the mouthpiece diameter of described separation system is 5 millimeters, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 22, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the mouthpiece diameter of described separation system is 5 millimeters, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 23, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the mouthpiece diameter of described separation system is 8 millimeters, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 24, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the mouthpiece diameter of described separation system is 10 millimeters, all the other are respectively with embodiment 4, embodiment 5.
Embodiment 25, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the open frequency of the quick valve in the described separation system is 0 time/second, all the other are respectively with embodiment 4, embodiment 5, embodiment 9.
Embodiment 26, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the open frequency of the quick valve in the described separation system is 100 times/second, all the other are respectively with embodiment 4, embodiment 5, embodiment 9.
Embodiment 27, a kind of method that the discrepant silicon material of color is carried out look choosing separation, wherein: the open frequency of the quick valve in the described separation system is 1000 times/second, all the other are respectively with embodiment 4, embodiment 5, embodiment 9.
Embodiment 28, a kind of method of the discrepant silicon material of color being carried out look choosing separation, it is characterized in that: the gray value of described normal silicon material is 65-80, the gray value of the heavily doped silicon material of non-grey is 85-120, and all the other are respectively with any one embodiment among the embodiment 1-27.
Embodiment 29, one group carry out the method that the look choosing separates with the discrepant silicon material of color, and wherein: the operating procedure that the look choosing separates is:
(1) the discrepant silicon material of color is dropped into feeding system;
(2) optical detection system carries out optical detection to the discrepant silicon material of the color in the feeding system;
(3) color distortion of optical detection system identification silicon material;
(4) signal of the color distortion of optical detection system identification silicon material sends control system to;
(5) control system drives separation system according to the signal of color distortion, and the discrepant silicon material of color is separated.
30,28 groups of methods that the discrepant silicon material of color is carried out look choosing separation of embodiment, wherein: the operating procedure that the look choosing separates is:
(1) the discrepant silicon material of color is dropped into feeding system;
(2) optical detection system carries out optical detection to the discrepant silicon material of the color in the feeding system;
(3) color distortion of optical detection system identification silicon material;
(4) signal of the color distortion of optical detection system identification silicon material sends control system to;
(5) control system drives separation system according to the signal of color distortion, and the discrepant silicon material of color is separated.The method of every group of look choosing separation is respectively with each embodiment among the embodiment 1-28.
Claims (11)
1, a kind of method of the discrepant silicon material of color being carried out look choosing separation, it is characterized in that: the discrepant silicon material of described color is meant the heavily doped silicon material of the normal silicon material and the non-grey of grey, by colour-selection technique the normal silicon material of grey is separated with the heavily doped silicon material of non-grey.
2, a kind of method that the discrepant silicon material of color is carried out look choosing separation, it is characterized in that: the operating procedure of colour-selection technique is:
(1) the discrepant silicon material of color is dropped in the color selector;
(2) look choosing;
(3) the heavily doped silicon material of non-grey falls into heavily doped silicon material discharge bucket, and the normal silicon material of grey falls into the normal silicon material discharge bucket, realizes that the heavily doped silicon material of non-grey separates with the normal silicon material of grey.
3, a kind of method that the discrepant silicon material of color is carried out look choosing separation as claimed in claim 1 or 2, it is characterized in that: described normal silicon material is 50%-80% to the reflection of light rate, the heavily doped silicon material of non-grey is 10%-30% to the reflection of light rate.
4, a kind of method that the discrepant silicon material of color is carried out look choosing separation as claimed in claim 1 or 2, it is characterized in that: the gray value of described normal silicon material is 65-80, the gray value of the heavily doped silicon material of non-grey is 85-120.
5, a kind of method that the discrepant silicon material of color is carried out look choosing separation, it is characterized in that: described color selector is to contain feeding system, optical detection system, separation system and control system.
6, a kind of method that the discrepant silicon material of color is carried out look choosing separation, it is characterized in that: the operating procedure of colour-selection technique is:
(1) the discrepant silicon material of color is dropped into feeding system;
(2) optical detection system carries out optical detection to the discrepant silicon material of the color in the feeding system;
(3) color distortion of optical detection system identification silicon material;
(4) signal of the color distortion of optical detection system identification silicon material sends control system to;
(5) control system drives separation system according to the signal of color distortion, and the discrepant silicon material of color is separated.
7, as claim 5 or 6 described any one discrepant silicon material of color is carried out the method that look choosing separates, it is characterized in that: the detection mode of described optical detection system is any one that monochromatic light detects, bi-coloured light detects, duplex monochromatic light detects.
8, as claim 5 or 6 described any one discrepant silicon material of color is carried out the method that the look choosing separates, it is characterized in that: the sorting mode of separation system is to adopt to open quick valve the winding-up sorting.
9, as claim 5 or 6 described any one discrepant silicon material of color is carried out the method that look choosing separates, it is characterized in that: the feeding speed of described feeding system be the 0.1-12 ton/hour.
10, as claim 5 or 6 or 8 described any one discrepant silicon material of color is carried out the method that the look choosing separates, it is characterized in that: the mouthpiece diameter of described separation system is 0.1 millimeter-10 millimeters.
11, as claim 6 or 8 described any one discrepant silicon material of color is carried out the method that the look choosing separates, it is characterized in that: the open frequency of the quick valve in the described separation system is 0-1000 time/second.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601063A (en) * | 2012-02-29 | 2012-07-25 | 浙江工业大学 | Automatic identifying and grading method for bamboo chips |
| CN105032789A (en) * | 2015-08-17 | 2015-11-11 | 江苏瑞新科技股份有限公司 | Color difference sorting device for silicon battery pieces and sorting method of color difference sorting device |
| CN111232987A (en) * | 2020-04-10 | 2020-06-05 | 昆明理工大学 | Method for efficiently recovering elemental silicon in industrial silicon slag |
| CN111232988A (en) * | 2020-04-10 | 2020-06-05 | 昆明理工大学 | Method for efficiently separating slag silicon from industrial silicon slag |
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2008
- 2008-12-31 CN CN200810136658A patent/CN101623693A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102601063A (en) * | 2012-02-29 | 2012-07-25 | 浙江工业大学 | Automatic identifying and grading method for bamboo chips |
| CN105032789A (en) * | 2015-08-17 | 2015-11-11 | 江苏瑞新科技股份有限公司 | Color difference sorting device for silicon battery pieces and sorting method of color difference sorting device |
| CN105032789B (en) * | 2015-08-17 | 2018-06-26 | 江苏瑞新科技股份有限公司 | The aberration sorting equipment and its method for sorting of a kind of silicon cell |
| CN111232987A (en) * | 2020-04-10 | 2020-06-05 | 昆明理工大学 | Method for efficiently recovering elemental silicon in industrial silicon slag |
| CN111232988A (en) * | 2020-04-10 | 2020-06-05 | 昆明理工大学 | Method for efficiently separating slag silicon from industrial silicon slag |
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Application publication date: 20100113 |