EP3807216A1 - Treatment process for recycling silicon ingot cutting waste - Google Patents
Treatment process for recycling silicon ingot cutting wasteInfo
- Publication number
- EP3807216A1 EP3807216A1 EP19737856.5A EP19737856A EP3807216A1 EP 3807216 A1 EP3807216 A1 EP 3807216A1 EP 19737856 A EP19737856 A EP 19737856A EP 3807216 A1 EP3807216 A1 EP 3807216A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mixture
- treatment method
- sludge
- silicon
- solid
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/02—Silicon
- C01B33/037—Purification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
- B01D21/262—Separation of sediment aided by centrifugal force or centripetal force by using a centrifuge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
- B01D21/267—Separation of sediment aided by centrifugal force or centripetal force by using a cyclone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D5/00—Fine working of gems, jewels, crystals, e.g. of semiconductor material; apparatus or devices therefor
- B28D5/0058—Accessories specially adapted for use with machines for fine working of gems, jewels, crystals, e.g. of semiconductor material
- B28D5/007—Use, recovery or regeneration of abrasive mediums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
- B28D7/02—Accessories specially adapted for use with machines or devices of the preceding groups for removing or laying dust, e.g. by spraying liquids; for cooling work
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Definitions
- the present invention relates to the silicon production line for the photovoltaic industry. It relates in particular to a treatment process for the recycling of waste from the cutting of silicon ingots ("kerf").
- silicon wafers intended for the semiconductor or photovoltaic industry, are manufactured from silicon ingots, essentially using cutting techniques using diamond wires. These processes have gradually supplanted sawing with metallic threads with abrasives (“slurry sawing” according to English terminology), because they provide better quality of inserts, at a lower production cost.
- the silicon powder correctly extracted from this mixture and purified, could be of great value for reuse in various industries, in particular those of the photovoltaic, energy storage, ceramic synthesis, etc. Effective purification of this silicon powder must in particular fulfill the following three objectives:
- These species come from organic (liquid) additives used in the sawing process or from polymer compounds contained for example in diamond wires or in saws.
- organic species residues in the silicon powder reduces the possibilities of reuse thereof; in fact, in most cases, the silicon is subjected to treatments at high temperatures, during which the organic species will be capable of creating particles of Sic, unfavorable to the majority of applications.
- the surface of the silicon microparticles has a layer of silicon oxide which can hinder, in certain cases, their reuse.
- Document WO2012125942 proposes a method using ozone to eliminate organic species, hydrochloric acid to dissolve metallic contaminants and hydrofluoric acid to eliminate the layer of silicon oxide.
- the main disadvantages of this method lie in the limited effectiveness of ozone due to its low solubility in water, and in the use of concentrated acids.
- the document W02010003456 also uses concentrated acids, which can pollute the environment and generate high process costs.
- Document CN103373731 proposes a method based on the oxidation of the silicon powder by a strong oxidant, followed by the extraction of the oxidized powder with an organic solvent.
- the disadvantages of this method lie in the use of chemicals that pollute the environment such as organic solvent and acid to deoxidize the silicon powder.
- the loss of part of the silicon during the process is also significant.
- the present invention aims to overcome all or part of the aforementioned drawbacks.
- the invention relates to a treatment method for recycling waste from the cutting of silicon ingots ("kerf"), by sawing with diamond wires, without abrasive.
- the invention relates to a treatment method for the purification of silicon microparticles contained in waste resulting from the cutting of ingots by diamond wires, without abrasive, comprising:
- the contaminated sludge is obtained from the waste, by a solid / liquid separation technique chosen from sedimentation, centrifugation, cyclonic separation or filtration, and the contaminated sludge comprises approximately 50% solid matter and 50% liquid matter, in mass percentages;
- the dilute solution of hydrogen peroxide has a mass concentration of between 1% and 35%;
- step b) comprises the addition of pure water to the first mixture, so that said first mixture comprises between 5 and 10% of solid matter, in percentage by mass;
- step b) is operated at a temperature between 20 ° C and 95 ° C, for a period ranging from 10 min to 5 h;
- step c) • the solid / liquid separation of step c) is carried out by a technique chosen from filtration, sedimentation, centrifugation or cyclonic separation, and in which the first purified sludge contains at least 40% solid matter, in percentage mass;
- the treatment method comprises, after step c), a step c ') during which one operates:
- the treatment process comprises, after step c), a step c '') during which one operates:
- the treatment process comprises, after step c ', a step c' ') during which one operates:
- the treatment process comprises a step d) of drying a purified sludge under an inert atmosphere to obtain purified silicon microparticles.
- FIG 1 shows steps of the treatment method according to the invention
- Figures 2a, 2b and 2c show an illustration of the treatment process for the purification of silicon microparticles, according to the invention
- Figures 3a, 3b, 3c and 3d show sectional views of a filter pad during sequences of a step of the treatment process according to the invention.
- the invention relates to a treatment method aimed at the purification of silicon microparticles contained in waste resulting from the cutting of ingots by diamond wires, without abrasive (FIG. 1).
- the silicon in this waste is found in the form of a very fine powder (silicon microparticles at least partially oxidized on the surface), mixed with liquid additives, metallic contaminants and organic or inorganic species.
- This waste mainly contains liquid matter, the mass percentage of silicon (which constitutes the majority of solid matter) is between 2% and 5%.
- the treatment method according to the invention comprises a step a) consisting in the supply of a contaminated sludge, coming from sawing waste, formed by the microparticles of silicon, organic species and metallic contaminants in an aqueous mixture.
- microparticles of silicon have a size distribution between about 10 nm and 5 microns, typically centered on 1 micron.
- mud a substance comprising more than 40% (mass percentage) of solid material (mainly consisting of silicon microparticles), mixed in an aqueous solution. All the proportions relating to the sludge of the present description are given in percentages by mass.
- the contaminated sludge comprises approximately 50% of solid material and 50% of liquid material.
- the term “approximately” here means that the value of the mass percentage is +/- 10% (absolute: that is to say that a mass percentage of approximately 50% may vary between 40% and 60%), or even +/- 5% (absolute).
- Contaminated sludge can be obtained from cutting waste (composed essentially of liquid material, the mass percentage of silicon being between 2% and 5%), by a known method of solid / liquid separation chosen from filtration (for example vacuum filtration) or tangential filtration, sedimentation, centrifugation or cyclonic separation. The contaminated sludge thus obtained has more than 40% solid matter (percentage by mass).
- the treatment method according to the invention then comprises a step b) during which a dilute solution of hydrogen peroxide (H2O2) is added to the contaminated sludge, thus forming a first mixture.
- dilute solution is meant a solution consisting of hydrogen peroxide and water.
- the diluted hydrogen peroxide solution may have a mass concentration of between 1% and 35% of hydrogen peroxide, the additional percentage being water. Note that no other acidic or basic product is added to form the first mixture.
- the first mixture therefore consists of contaminated mud, hydrogen peroxide and water.
- the first mixture preferably comprises a volume of dilute H 2 O 2 solution for a volume of contaminated sludge; for a concentration of H 2 O 2 of 10%, the first mixture preferably comprises three volumes of diluted solution for one volume of contaminated sludge.
- Step b) also includes the stirring of this first mixture, so as to homogenize the distribution of the dilute H 2 O 2 solution in the middle of the silicon microparticles 1 and other organic species 3 or metallic contaminants 4.
- the silicon microparticles 1 originating from the contaminated sludge mainly comprise a layer of silicon oxide 2 on their surface; moreover, they are totally or partially “covered” by layers formed by long chains of organic species 3 (FIG. 2a).
- Hydrogen peroxide by an oxidation reaction of organic species 3, will induce the segmentation of long organic chains 3 which favors their detachment from the surface of silicon microparticles 1. Consequently, metallic contaminants 4, linked to the silicon microparticles 1 via the organic layers 3, will also be detached ( Figure 2b). Note that this oxidation reaction also generates carbon dioxide (C02) in gaseous form.
- the first mixture comprises approximately 5% to 10% of solid material and an additional percentage of liquid material (in mass percentage): this liquid consistency promotes the suspension of silicon microparticles 1 and other organic species 3 or metallic contaminants 4, in the first mixture.
- this liquid consistency promotes the suspension of silicon microparticles 1 and other organic species 3 or metallic contaminants 4, in the first mixture.
- Such consistency of the first mixture is directly reached when a solution with a low concentration of H 2 O 2 is mixed with the contaminated sludge.
- a solution with a low concentration of H 2 O 2 is mixed with the contaminated sludge.
- the volume of diluted H 2 O 2 solution added is not sufficient to reach 5% to 10% of solid matter in the first mixture, pure water is added to achieve the desired consistency of said first mixture.
- pure water is meant deionized water or ultra-pure water, respectively having a resistivity of a few hundred kohms. cm and a resistivity greater than 18.2 Mohms.cm.
- the agitation of the first mixture then makes it possible to homogenize the distribution of the microparticles of silicon 1 and other organic species 3 or metallic contaminants 4 suspended in the first mixture; stirring also makes it possible to increase the efficiency of the oxidation reaction segmenting the organic chains 3.
- Step b) can be carried out at a temperature between 20 ° C and 95 ° C, for a period ranging from 10 min to 5 h.
- the first aqueous mixture comprises particles in homogeneous suspension, among which the silicon microparticles 1, the organic species 3 mainly in the form of segmented chains and the metallic contaminants 4.
- the treatment method according to the invention then comprises a step c) implementing a solid / liquid separation of the first mixture to obtain, on the one hand, a first purified sludge and, on the other hand, a first liquid loaded with organic species and metallic contaminants.
- the first purified sludge is composed of at least 40% solid matter ( Figure 2c).
- the first liquid can be discharged and treated as a liquid effluent.
- step b Due to the segmentation of organic chains, fragments of organic layers are detached from the silicon microparticles (step b)) and they are, in step c), removed with the liquid part (first liquid), due to their reduced size and / or their dissolution in water, and therefore separated from the solid material (first purified sludge).
- step c) of solid / liquid separation at least 90% of the organic species initially present in the contaminated sludge are discharged into the first liquid.
- the metallic contaminants (all combined), initially present at approximately 1% to 3% (mass percentage) in the contaminated sludge are also greatly reduced after this step c), in particular due to their initial bond with organic species.
- the solid / liquid separation technique of step c) may be chosen from sedimentation, centrifugation, cyclonic separation, filtration, or other suitable known technique.
- the treatment process comprises a rinsing step c ', during which pure water is added to the first purified sludge to form a second mixture ( Figure 1).
- the second mixture preferably comprises at least ten volumes of water for a volume of the first mud. Agitation is provided to homogenize the second mixture.
- Step c ′) then comprises a solid / liquid separation of the second mixture to obtain, on the one hand, a second purified sludge and, on the other hand, a second liquid containing organic species and residual metallic contaminants.
- the second purified sludge is composed of at least 40% solid matter.
- the second liquid can be discharged and treated as a liquid effluent.
- This second purified sludge is rinsed once more than the first sludge. It therefore has a higher level of purity: at least 95% of the organic species initially present in the contaminated sludge are eliminated after this step c '). The level of metallic contaminants is also improved following this step c ').
- step c ′) is repeated one to five times, in order to reach an optimal level of purity (typically a reduction in organic species and metallic contaminants by at least a factor of one hundred compared to the initial contaminated sludge), all by keeping costs (generated by the repetition of step c ')) reasonable.
- an optimal level of purity typically a reduction in organic species and metallic contaminants by at least a factor of one hundred compared to the initial contaminated sludge
- the treatment method according to the invention advantageously comprises a step d) during which a purified sludge (the first or the second) is dried under an inert atmosphere, so as to obtain purified silicon microparticles.
- the drying is carried out under vacuum, at a temperature between 50 ° C and 80 ° C and with stirring.
- Equipment of the filter-dryer type, fitted with a mechanical stirrer, may for example be used.
- a very good level of purification (organic and metallic) of the silicon microparticles is typically reached:
- the silicon microparticles nevertheless retain an oxide layer on their surface.
- the treatment method according to the invention comprises a step c '') intended to remove all or part of the oxide present on the silicon microparticles.
- Step c '') can be carried out after step c) or after step c ') ( Figure 1).
- a filter cake 10 can in particular be obtained after filtration under a press (“filter-press cake” according to English terminology): the first 11 (or the second 12) purified mud is thus kept pressed between two porous membranes 20, taking the shape of a pancake 10.
- Step c '' then comprises circulating a solution 30 of hydrofluoric acid (HF) diluted between 0.1% and 1% (mass percentage) through the filter slab 10 (FIG. 3b).
- HF hydrofluoric acid
- the HF solution 30 will thus be in contact with the silicon microparticles of the wafer 10 and attack the oxide layer surrounding them, all along its path between the two membranes 20.
- two volumes of 0.5% HF 30 solution will be circulated.
- a higher number of volumes of solution 30 will be used to cross the wafer 10.
- step c '' comprises the circulation of pure water 40 through the filtration wafer 10 allowing the rinsing of said wafer 10 and the elimination of hydrofluoric acid (FIG. 3c).
- the pure water 40 will circulate through the wafer 10 by taking more or less the same paths and interstices as the HF solution 30, thus ensuring an effective rinsing of said wafer 10.
- a pH measurement at the level of the water outlet membrane makes it possible to check the effectiveness of the rinsing: a pH value of 7 is targeted for a complete rinsing.
- Step c '') ends with obtaining a third purified sludge 13 (Figure 3d), composed of more than 40% solid material.
- the third purified sludge 13 is formed from silicon microparticles predominantly devoid of their surface oxide layer.
- the treatment method advantageously comprises a drying step d) during which the third purified sludge is dried under an inert atmosphere to avoid the formation of an oxide layer on the purified silicon microparticles.
- the conditioning which follows this step is also carried out so as to keep the dry silicon powder in an inert, non-oxidizing atmosphere.
- purified silicon microparticles with a low silicon oxide content are obtained; they may have the following characteristics:
- step c '' of oxide removal makes it possible to lower the level of metal contaminants because these are often integrated into the surface oxide layer covering the silicon microparticles: the elimination of this layer promotes therefore the elimination of metallic particles.
- the treatment method according to the invention allows recycling of more than 95% of the silicon contained in the form of microparticles in sawing waste.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1855202A FR3082512B1 (en) | 2018-06-14 | 2018-06-14 | PROCESS FOR THE RECYCLING OF WASTE FROM THE CUTTING OF SILICON INGOTS |
PCT/FR2019/051422 WO2019239067A1 (en) | 2018-06-14 | 2019-06-13 | Treatment process for recycling silicon ingot cutting waste |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3807216A1 true EP3807216A1 (en) | 2021-04-21 |
Family
ID=63638010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19737856.5A Pending EP3807216A1 (en) | 2018-06-14 | 2019-06-13 | Treatment process for recycling silicon ingot cutting waste |
Country Status (6)
Country | Link |
---|---|
US (1) | US20210253435A1 (en) |
EP (1) | EP3807216A1 (en) |
JP (1) | JP7376215B2 (en) |
CN (1) | CN112512970A (en) |
FR (1) | FR3082512B1 (en) |
WO (1) | WO2019239067A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115193101B (en) * | 2021-04-09 | 2024-02-13 | 中国矿业大学 | Method for recovering wire cutting cooling liquid |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0533070A (en) * | 1991-05-11 | 1993-02-09 | Toho Aen Kk | Method for removing impurity in metal silicon powder |
WO2005077408A2 (en) * | 2004-02-06 | 2005-08-25 | Vaxinnate Corporation | Compositions of pamps and listeria monocytogenes and methods of use |
JP2009149480A (en) * | 2007-12-21 | 2009-07-09 | Sharp Corp | Silicon regenerating method |
JP2011527279A (en) * | 2008-07-09 | 2011-10-27 | ガルボ・エッセ・エッレ・エッレ | Raw material purification and compression methods for photovoltaic applications |
CN101683981B (en) * | 2008-09-25 | 2012-07-18 | 浙江昱辉阳光能源有限公司 | Method for recycling waste silicon solution |
KR101538827B1 (en) * | 2008-12-31 | 2015-07-22 | 엠이엠씨 싱가포르 피티이. 엘티디. | Methods to recover and purify silicon particles from saw kerf |
KR101138733B1 (en) * | 2009-10-01 | 2012-04-24 | (주) 이피웍스 | Method for regenerating silicon from silicon waste and silicon manufactured using the smae |
JP2013189318A (en) * | 2010-06-22 | 2013-09-26 | Sumco Corp | Method for producing raw material for silicon-based solar cell |
US9352017B2 (en) | 2011-03-16 | 2016-05-31 | Rutgers, The State University Of New Jersey | Combination therapy with leukotoxin |
CN103373731B (en) | 2012-04-12 | 2015-07-15 | 江西赛维Ldk太阳能高科技有限公司 | Method for recycling silicon powder from diamond wire cutting slurry |
CN102642835A (en) * | 2012-04-19 | 2012-08-22 | 镇江环太硅科技有限公司 | Method for recovering silicon material from waste materials in cutting crystalline silicon by diamond wire |
JP2014019603A (en) * | 2012-07-18 | 2014-02-03 | Kuraray Co Ltd | Washing apparatus of silicon sludge and recovery method of silicon |
CN102815700A (en) * | 2012-09-18 | 2012-12-12 | 复旦大学 | Method for preparing nanometer silicon carbide by recycling silicon cut wastes |
JP6433674B2 (en) * | 2014-04-07 | 2018-12-05 | 株式会社トクヤマ | Cleaning method for polycrystalline silicon |
SG11201708638PA (en) * | 2015-04-20 | 2017-11-29 | Tkx Corp | Method for producing fine silicon powder, and method for producing fine silicon nitride powder |
TWI568672B (en) * | 2016-01-12 | 2017-02-01 | 光宇材料股份有限公司 | Using method of waste silicon slurry and products obtained therefrom |
CN107416838B (en) * | 2017-03-10 | 2020-10-30 | 宜兴市昱元能源装备技术开发有限公司 | Regeneration and purification process for recyclable silicon material in photovoltaic industrial chain |
-
2018
- 2018-06-14 FR FR1855202A patent/FR3082512B1/en active Active
-
2019
- 2019-06-13 JP JP2020569750A patent/JP7376215B2/en active Active
- 2019-06-13 CN CN201980051759.3A patent/CN112512970A/en active Pending
- 2019-06-13 US US17/256,816 patent/US20210253435A1/en active Pending
- 2019-06-13 EP EP19737856.5A patent/EP3807216A1/en active Pending
- 2019-06-13 WO PCT/FR2019/051422 patent/WO2019239067A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
CN112512970A (en) | 2021-03-16 |
JP7376215B2 (en) | 2023-11-08 |
WO2019239067A1 (en) | 2019-12-19 |
FR3082512A1 (en) | 2019-12-20 |
FR3082512B1 (en) | 2022-05-06 |
JP2021527027A (en) | 2021-10-11 |
US20210253435A1 (en) | 2021-08-19 |
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