WO2012018175A2 - 세리아계 연마재의 재생방법 - Google Patents
세리아계 연마재의 재생방법 Download PDFInfo
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- WO2012018175A2 WO2012018175A2 PCT/KR2011/004612 KR2011004612W WO2012018175A2 WO 2012018175 A2 WO2012018175 A2 WO 2012018175A2 KR 2011004612 W KR2011004612 W KR 2011004612W WO 2012018175 A2 WO2012018175 A2 WO 2012018175A2
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- ceria
- based abrasive
- frit glass
- abrasive
- polishing pad
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
Definitions
- the present invention relates to a method for regenerating ceria-based abrasives, and more particularly, to a ceria-based abrasive that can environmentally regenerate high-purity ceria-based abrasives from abrasive waste including ceria-based abrasives, frit glasses, polishing pads, and inorganic flocculants. It relates to a regeneration method.
- Ceria-based abrasives containing ceria (CeO 2 ) as a main component are used for polishing various glass materials.
- glass for magnetic recording media such as hard disks, glass substrates of liquid crystal displays (hereinafter referred to as “LCDs”), glass substrates of plasma display panels (hereinafter referred to as “PDPs”), It is also used for polishing of the same glass material, and its application field is gradually expanding.
- Abrasive wastes are produced during sandblasting or floating processes using ceria-based abrasives, which include impurities such as ceria-based abrasives, frit glass components and polishing pad components in glass materials. exist.
- the ceria-based abrasive accounts for about 10 wt% to 60 wt%, and the frit glass is present in the form of a powder mixed with the ceria-based abrasive or adsorbed on the ceria-based abrasive surface.
- the frit glass has SiO 2 as a main component.
- the abrasive waste slurry containing the ceria-based abrasives having been polished is sent to a purification device, and the solidification particle is added by adding an aluminum (Al) or iron (Fe) flocculant in the purification device. Is precipitated and caked, the discharged liquid is chemically treated and discharged, and the caked abrasive waste is disposed of in its entirety.
- Korean Patent Application No. 10-2005-0037510 discloses a method for recycling CRT sludge by wet specific gravity method, and suggests a method of separating and recycling CRT sludge by wet specific gravity screening method. It is a technique of separating and recovering each component in a different composition.
- Korean Patent Application No. 10-2006-0103546 relates to a method of reclaiming waste abrasive for polishing a glass panel for display, and shows a method for separating the display abrasive sludge and adding a metal oxide to sinter and classify.
- a technique for adding, sintering and pulverizing a metal oxide from an abrasive slurry to a sintering aid a process is complicated and energy consumption is high.
- the problem to be solved by the present invention is environmentally friendly recycling of ceria-based abrasives from abrasive waste including ceria-based abrasives, frit glass, polishing pad and inorganic flocculant, high purity ceria-based abrasives, high yield of ceria
- the present invention provides a method for regenerating a system abrasive.
- the present invention relates to a method for regenerating a ceria-based abrasive from an abrasive waste comprising a ceria-based abrasive, a frit glass, a polishing pad, and an inorganic flocculant, wherein the organic acid solution does not form a salt by reacting with the ceria-based abrasive in a reaction tank.
- the inorganic flocculant is converted into ionic species by acid treatment with the organic acid, and the frit glass and the polishing pad are suspended, and the suspended frit glass and the polishing pad are removed.
- performing a washing and drying process to obtain a ceria-based abrasive, wherein the pH of the organic acid is in the range of 0.5 to 6.
- ultrasonic waves are applied through an ultrasonic horn installed in the reaction tank while stirring with a stirrer installed in the reaction tank, and the chemical reaction of the organic acid and the inorganic coagulant is promoted by the ultrasonic waves, Ultrasonic waves that explode rapidly and burst at the limit due to high pressure and the shock wave when the bubbles explode act on the abrasive waste, causing the frit glass and the polishing pad to adhere to the ceria-based abrasive surface to be separated from the ceria-based abrasive surface. It may further comprise a processing step.
- the method of regenerating the ceria-based abrasive air is injected by using a bubble generator provided in the lower part of the reactor while stirring with a stirrer installed in the reactor, thereby generating bubbles and by the force of the shock waves or bubbles that rise.
- the method may further include a bubble treatment step of removing the frit glass and the polishing pad from the ceria-based abrasive surface to float.
- the regeneration method of the ceria-based abrasive may further include performing a wet vibrating sifting to filter the foreign matter mixed during the regeneration process and the floating frit glass and the polishing pad after the acid treatment. It is preferable to sift the vibrating sieve with a 50 to 2000 mesh sieve.
- the regeneration method of the ceria-based abrasive may further include alkali treatment by adding an alkaline solution to dissolve the frit glass remaining in the ceria-based abrasive after removing the frit glass and the polishing pad.
- the alkaline solution uses at least one alkali compound selected from sodium hydroxide, potassium hydroxide, ammonia, primary amines having 1 to 10 carbon atoms, secondary amines and tertiary amines, and the alkali treatment has a pH in the range of 9 to 13 It is preferable to selectively remove the frit glass by adding the alkaline solution so that the weight ratio of the ceria-based abrasive and the alkaline solution is in the range of 1: 0.5 to 10.
- the inorganic flocculant may be composed of aluminum sulfate, polyaluminum chloride, ammonium alum, sodium aluminate, ferrous sulfate, ferric sulfate or ferric chloride.
- the organic acid solution preferably includes at least one acid selected from acetic acid, lactic acid, citric acid and oxalic acid.
- the regeneration method of the ceria-based abrasive may further include performing a second acid treatment using an organic acid solution different from the organic acid solution after acid treatment with the organic acid solution.
- the ceria-based abrasive can be separated and recovered with high purity from the ceria-based abrasive waste which is entirely disposed of in landfill, and can be recycled, thus replacing the ceria-based abrasive depending on the total amount of import.
- the frit glass, the polishing pad, and the inorganic flocculant present in the abrasive waste are eco-friendly and easily removed to obtain a high purity ceria-based abrasive. It has the advantage that the yield is very high.
- the expensive ceria-based abrasive recycled from the abrasive waste can be used again in the industrial field, which can greatly reduce the industrial cost and production cost, and can suppress environmental pollution by not discarding the abrasive waste.
- FIG. 1 is a view schematically illustrating a reaction tank in which a frit glass and a polishing pad are lifted and filtered while generating bubbles by a bubble treatment process.
- Figure 2 is a graph showing the particle size distribution of commercially available ceria-based abrasives.
- FIG. 3 is a graph showing the particle size distribution of the ceria-based abrasive recycled according to Example 1.
- 4 to 6 are graphs showing the particle size distribution of the ceria-based abrasive obtained by pulverizing the ceria-based abrasive recycled according to Example 1 using an ultrasonic vibrating body.
- 7 and 8 are scanning electron microscope (Scanning Electron Microscope) photograph of the regular product.
- 9 and 10 are scanning electron microscope (SEM) photographs of abrasive waste.
- 11 to 13 are scanning electron microscope (SEM) photographs of ceria-based abrasives obtained by pulverizing a ceria-based abrasive recycled according to Example 1 using an ultrasonic vibrating body.
- FIG. 14 is a graph showing X-ray diffraction patterns of commercially available ceria-based abrasives.
- FIG. 15 is a graph showing an X-ray diffraction pattern of a ceria-based abrasive obtained by pulverizing the ceria-based abrasive recycled according to Example 1 using an ultrasonic vibrating body.
- FIG. 15 is a graph showing an X-ray diffraction pattern of a ceria-based abrasive obtained by pulverizing the ceria-based abrasive recycled according to Example 1 using an ultrasonic vibrating body.
- the present invention relates to a method for regenerating a ceria-based abrasive from an abrasive waste comprising a ceria-based abrasive, a frit glass, a polishing pad, and an inorganic flocculant, wherein the organic acid solution does not form a salt by reacting with the ceria-based abrasive in a reaction tank.
- the inorganic flocculant is converted into ionic species by acid treatment with the organic acid, and the frit glass and the polishing pad are suspended, and the suspended frit glass and the polishing pad are removed.
- performing a washing and drying process to obtain a ceria-based abrasive, wherein the pH of the organic acid is in the range of 0.5 to 6.
- the present invention provides a method for regenerating ceria-based abrasives in abrasive waste containing ceria abrasives.
- a sandblasting process or a roll is performed by spraying a ceria-based abrasive onto a glass material using an abrasive powder spray nozzle.
- a floating (role floating) process is used.
- Abrasive waste is generated in a sandblasting process or a floating process using a ceria-based abrasive, and the abrasive waste includes a frit glass component and a polishing pad component included in the ceria-based abrasive and glass materials.
- the ceria-based abrasive accounts for about 10 to 60 wt%, and the frit glass and the polishing pad are present in the form of powder mixed with the ceria-based abrasive or adsorbed on the ceria-based abrasive surface.
- the frit glass has SiO 2 as a main component.
- Abrasive wastes which are abrasive by-products of glass materials, are caked by adding inorganic flocculants such as aluminum (Al) or iron (Fe) flocculants to precipitate solid particles and drain the liquid.
- inorganic flocculants such as aluminum (Al) or iron (Fe) flocculants
- aluminum flocculant examples include aluminum sulfate (Al 2 (SO 4 ) 3 ⁇ 18H20), polyaluminum chloride (PAC), ammonium alum (Al 2 (SO 4 ) 3 ⁇ (NH 4 ) 2 SO 4 ⁇ 24H 2 O), Sodium aluminate (NaAlO 2 ) and the like are used, and ferrous coagulants include ferrous sulfate (FeSO 4 ⁇ 7H 2 O), ferric sulfate (Fe 2 (SO 4 ) 3 ), and ferric chloride (FeCl 3). 6H 2 O) and the like are used.
- the aluminum salt or iron salt used as the inorganic flocculant is easily hydrolyzed in water to become a polymerized polyvalent cation and consumes alkali or generates CO 2 in the reaction to lower the pH.
- aluminum sulfate reacts with alkali in water to form aluminum hydroxide, causing agglomeration, and in the process, CO 2 is also generated, resulting in a decrease in pH, and ferric sulfate in alkali. It forms a hydroxide by reacting with and generates CO 2.
- Ferric chloride is also known to lower the pH by generating hydrochloric acid or CO 2 .
- the abrasive waste which is a by-product used for polishing the glass material contains oxide fine particles such as ceria abrasive, frit glass, polishing pad, and inorganic coagulant component used for polishing the glass material.
- the specific gravity difference between the ceria-based abrasive and the frit glass shows a large variation, but the average particle diameter does not show a variation.
- the ceria-based abrasive and the frit glass have a maximum particle size of 10 ⁇ m or less, it is not easy to selectively remove the frit glass and the inorganic flocculant through the general classification process, and the method described in the preferred embodiment of the present invention. It must be removed through the same special process.
- An acid treatment method using an organic acid solution can selectively classify ceria-based abrasives from abrasive waste containing ceria-based abrasives.
- An acid slurry is prepared to selectively classify only ceria-based abrasives.
- an acidic solution containing an organic acid and an abrasive waste containing an organic acid that does not form a salt by reacting with a ceria-based abrasive is added to a reaction tank, and then stirred with a stirrer to give an acid having a solid content of about 0.1 to 50% by weight.
- a slurry is formed to perform an acid treatment process in which the frit glass and the polishing pad contained in the abrasive waste are suspended and the inorganic flocculant is converted into ionic species.
- the stirring speed in preparing the acid slurry is about 50 to 2000 rpm so that the frit glass, the polishing pad, and the inorganic coagulant mixed in the polishing waste are sufficiently dispersed and reacted.
- the organic acid solution is an acid solution that does not form a salt by reacting with a ceria-based abrasive, and includes at least one selected from acetic acid, lactic acid, citric acid, and oxalic acid. It is preferable to use the above organic acid. Inorganic acids such as nitric acid, sulfuric acid, and hydrochloric acid may melt the ceria-based abrasive, and therefore, it is preferable to use an organic acid.
- the concentration of the organic acid solution is preferably about 0.1 ⁇ 30wt%.
- the acid treatment process using the organic acid solution is preferably carried out for 30 minutes to 48 hours at a temperature of about room temperature (for example, 10 to 30 °C) to 100 °C.
- the polishing waste and the organic acid are preferably mixed in a weight ratio of about 1: 0.1 to 10 (polishing waste: organic acid). If the content of the organic acid is too small, the inorganic coagulant may not be sufficiently converted into ionic species. If the content of the organic acid is too high, it may be difficult to expect the effect of changing the inorganic coagulant to the ionic species any more. Not
- the organic acid is added to change the pH in the range 0.5-6.0, more preferably in the range 2.0-4.0. If the pH controlled by the addition of the organic acid is less than 0.5, the acidity of the acidic slurry is not only too high and unstable, but the stability of the subsequent work may be reduced by the high acidity. The effect of changing the flocculant into ionic species may be weak.
- the inorganic flocculant changed to the ionic species when the pH was 0.5 to 6.0 due to the addition of the organic acid.
- the frit glass and the polishing pad were also well floated and separated from the ceria-based abrasives.
- the inorganic flocculant is transformed into ionic species and dispersed in the organic acid solution in a dissolved state, and the frit glass forms a complex compound and floats on the organic acid solution.
- Ceria-based abrasives sink because they have a specific gravity that is relatively greater than that of frit glass and polishing pads and is insoluble in organic acids and heavy. Due to the difference in specific gravity, the ceria-based abrasive having a higher specific gravity is settled, and the frit glass and the polishing pad having a smaller specific gravity are separated from the ceria-based abrasive and suspended.
- an ultrasonic treatment may be performed by injecting ultrasonic waves into the slurry using an ultrasonic wave oscillator.
- the sonication process removes the frit glass and the polishing pad from the ceria-based abrasive surface from the ceria-based abrasive surface.
- the frit glass component and the polishing pad component contained in the abrasive waste are separated from the ceria-based abrasive by the ultrasonic treatment process.
- the frequency of the ultrasonic waves to be scanned may be about 28 to 40 kHz, and the ultrasonic waves are preferably applied for about 30 minutes to about 6 hours.
- ultrasound refers to sound waves having a frequency of 20kHz or more.
- the frit glass and the polishing pad are caused by the force of the shock waves or bubbles that rise. It is also possible to perform a bubble treatment process to remove the from the ceria-based abrasive surface to rise.
- the frit glass mixed in the abrasive waste has a specific gravity of about 1.4 and the ceria-based abrasive has a specific gravity of about 7, and the specific gravity difference between the frit glass and the ceria-based abrasive shows a large variation.
- the frit glass can be selectively removed by classifying from the ceria-based abrasive.
- FIG. 1 shows a reaction tank 100 in which bubbles are raised and filtered while generating bubbles by a bubble treatment process.
- a stirrer 120 including a motor M and a rotary blade 110 rotated by the motor M is installed, and the rotary blade 110 of the stirrer 120 is provided. Rotate at 50 to 2000 rpm.
- an ultrasonic horn H is installed in the reactor 100, and the ultrasonic horn H is connected to an ultrasonic wave generator (not shown).
- the ultrasonic waves oscillated by the ultrasonic generator are applied to the ultrasonic horn H to generate ultrasonic waves in the reaction tank.
- the ultrasonic waves applied to the ultrasonic horn H serve to separate the frit glass and the polishing pad from the ceria-based abrasive surface in the reaction tank 100 from the ceria-based abrasive surface.
- the lower surface in the reaction tank 100 is provided with a perforated plate 130 having a plurality of fine pores, and functions to generate air bubbles when passing through the perforated plate 130 by injecting air from the lower perforated plate 130.
- the slurry including the frit glass, the polishing pad, the inorganic coagulant, and the ceria-based abrasive is not precipitated by the rotation of the stirrer 120 to prevent the pores of the perforated plate 130 from being blocked.
- bubbles are generated through the perforated plate 130, so that the frit glass and the polishing pad rise together with the bubbles.
- the ceria-based abrasive has a large specific gravity and cannot remain on the bubble and remains on the bottom surface of the reactor 100. Bubbles generated through the stirring process in the reaction tank 100 cling to the surface of the frit glass and the polishing pad to increase the buoyancy, so that the frit glass and the polishing pad quickly rise above the water surface.
- the rotational speed of the stirrer 120 is too large, the vortex occurs largely, so that the ceria-based abrasive may also float along the wall surface of the reactor 100 by the vortex, and the rotational speed of the stirrer 120 is too small. Since the frit glass and the polishing pad do not float and are mixed with the ceria-based abrasive, sufficient separation is difficult, so that the rotation speed of the stirrer 120 is about 50 to 2000 rpm.
- the wet vibration sieve classification method described later may be used.
- the sieve used for the wet vibration sieve classification has a size of 50 to 2000 mesh.
- the floated frit glass and polishing pad are in agglomerated form and have a particle size of about 10 ⁇ m or more, and the ceria-based abrasive has a particle size of less than 10 ⁇ m.
- the frit glass and the polishing pad are selectively removed using a wet vibrating sieve. can do.
- the wet vibrating sifting process may be performed by sieving while vibrating the slurry in which the acid treatment process is performed with a sieve of a target mesh to selectively separate the ceria-based abrasive from the slurry.
- the frit glass and the polishing pad having a large particle diameter do not pass through the sieve, and the ceria-based abrasive having a small particle size passes through the sieve, whereby the floated frit glass and the polishing pad are selectively classified from the ceria-based abrasive.
- the frit glass may be easily removed by pouring the frit glass suspended in the reactor. Inorganic flocculant converted to ionic species is dispersed in the organic acid solution, so it is removed together in the process of pouring the frit glass.
- the acid treatment process using the organic acid solution may be repeatedly performed at least one or more times using different organic acids.
- primary acid treatment may be performed using acetic acid
- secondary acid treatment may be performed using oxalic acid.
- an alkali treatment process may be performed to remove frit glass remaining in the ceria-based abrasive using an alkaline solution.
- an alkaline solution at least one alkali compound selected from sodium hydroxide, potassium hydroxide, ammonia, a primary amine having 1 to 10 carbon atoms, a secondary amine, and a tertiary amine may be used.
- the alkaline solution serves to dissolve the frit glass. It is preferable that the said alkali treatment consists of pH in the range of 9-13, More preferably, it is the range of 9.5-12.
- the alkali treatment step is preferably carried out for 30 minutes to 48 hours at a temperature of about room temperature (for example, 10 to 30 °C) to 100 °C.
- the acid treated ceria-based abrasive and the alkaline solution are preferably mixed in a weight ratio of about 1: 0.5 to 10 (ceria-based abrasive: alkali solution). If the content of the alkaline solution is too small, the frit glass cannot be sufficiently dissolved, and if the content of the alkaline solution is too large, it is not economical as waste of raw materials.
- the concentration of the alkaline solution is preferably about 0.1 ⁇ 30wt%.
- the drying process may be performed through a general drying process such as hot air drying, vacuum drying, spray drying or freeze drying, and may obtain a ceria-based abrasive after the drying process.
- the ceria-based abrasive particles may be pulverized or pulverized to separate the particles from each other and to be refined.
- the pulverization or pulverization may use a generally known ultrasonic sieving method, a ball mill method, or the like.
- An acid slurry was prepared. Specifically, 1 kg of oxalic acid, 12 kg of abrasive waste including ceria-based abrasive, frit glass, polishing pad, and poly aluminum chloride inorganic flocculant, and 75 kg of 22 kg of water (H 2 O) After input to a dissolver (high speed stirrer), the mixture was stirred to form an acidic slurry, and a first acid treatment process was performed. The pH of the slurry was about 1.5.
- the apparatus for the bubble treatment process is provided with a reaction tank 100, the reaction tank 100 in the rotary blade 110 that is rotated by a motor (M) and the motor (M).
- the stirrer 120 is configured to be installed, the ultrasonic wave horn (H) is installed in the reaction tank 100, the ultrasonic horn 50 is an ultrasonic wave generator (ultrasonic wave generator) Is connected to, the lower surface of the reaction tank 100 is provided with a perforated plate 130 formed with a plurality of holes, by injecting air from the lower perforated plate 130 to generate bubbles when passing through the perforated plate 130 It was.
- the frit glass and the polishing pad were floated together with the bubbles by bubbles generated while passing air through the perforated plate 130 having fine pores by slowly injecting air from the lower inlet while slowly stirring the stirrer 120.
- wet vibrating sifting was performed to remove suspended frit glass, polishing pad and foreign matter.
- the wet vibrating sifting sifted the frit glass and polishing pad suspended in a 100 mesh sieve, causing the aggregated ceria-based abrasive to disintegrate by vibration.
- the second wet vibration sieve was classified using a 300 mesh sieve.
- the reaction vessel in which the ceria-based abrasive was settled was tilted to pour out the floating frit glass.
- the ceria-based abrasive remains in the bottom of the reactor.
- the frit glass may be easily removed by pouring the frit glass suspended in the reactor. Inorganic flocculant converted to ionic species is dispersed in the organic acid solution, so it is removed together in the process of pouring the frit glass.
- wet sifting was performed using a 1450 mesh sieve to remove frit glass or foreign matter.
- a drying process was performed to dry the washed resultant.
- the drying process was using a hot air dryer, and dried at 90 °C for 24 hours to obtain a high purity ceria-based abrasive.
- FIG. 2 is a graph showing a particle size distribution of commercially available ceria-based abrasives (hereinafter referred to as 'regular article'), and FIG. 3 is a ceria-based abrasive (hereinafter referred to as 'regenerated dried article') recycled according to Example 1
- This graph shows the particle size distribution of. 4 to 6 are graphs showing the particle size distribution of the ceria-based abrasive (regenerated crushed product) obtained by pulverizing the ceria-based abrasive recycled according to Example 1 using an ultrasonic vibrating body.
- the feeding speed is 10 kg / kg (FIG. 4), 30 kg / kr (FIG.
- the regenerated dried product showed almost the same particle size distribution as compared to the regular product, and compared to FIG. 4 to FIG.
- Table 1 shows the results of particle size analysis of regular products, regenerated dried products and remanufactured products.
- Table 2 shows the results of X-ray fluorescence (X-ray fluorescence) analysis of regular products, regenerated dry products and remanufactured products.
- FIGS. 7 and 8 are scanning electron microscope (SEM) photographs of regular products
- FIGS. 9 and 10 are scanning electron microscope (SEM) photographs of abrasive waste
- FIGS. 11 to 13 are scans of remanufactured products. SEM photographs.
- FIG. 14 is a graph showing an X-ray diffraction (XRD) pattern of a regular product
- FIG. 15 is a graph showing an X-ray diffraction (XRD) pattern of a remanufactured product.
- Ceria-based abrasives can be separated and recovered with high purity from ceria-based abrasive waste that is entirely disposed of in landfills, and expensive ceria-based abrasives recycled from abrasive wastes can be reused on industrial sites, thus reducing industrial and production costs. There is industrial applicability as it can significantly reduce and suppress environmental pollution by not discarding abrasive waste.
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Abstract
Description
품목 | D10(㎛) | D50(㎛) | D90(㎛) | D100(㎛) |
정규품 | 0.725 | 1.689 | 3.704 | 8.71 |
재생건조품 | 0.800 | 2.029 | 5.448 | 34.674 |
재생해쇄품1 | 0.639 | 1.478 | 3.515 | 8.71 |
재생해쇄품2 | 0.646 | 1.554 | 3.625 | 8.71 |
재생해쇄품3 | 0.751 | 1.767 | 3.855 | 8.71 |
정규품 | 연마 폐기물 | 재생해쇄품 | |
F | 10.4 | 7.31 | 7.38 |
Mg | 0.0015 | 0.254 | 0.0160 |
Al | 0.0284 | 8.22 | 0.0343 |
Si | 0.0631 | 1.61 | 0.0913 |
P | 0.0038 | 0.397 | 0.0318 |
S | 0.0504 | 0.436 | 0.0188 |
K | 0.0149 | 0.0198 | 0.0074 |
Ca | 0.157 | 0.236 | 0.151 |
Fe | 0.0482 | 0.898 | 0.111 |
Cu | 0.0185 | 0.0190 | |
Sr | 0.0477 | 0.0522 | |
Zr | 0.0185 | 0.0076 | |
La | 30.4 | 26.9 | 30.6 |
Ce | 55.5 | 50.6 | 57.4 |
Pr | 3.11 | 2.78 | 3.53 |
Nd | 0.160 | 0.259 | 0.395 |
Ag | 0.105 |
Claims (8)
- 세리아계 연마재, 프릿 글래스, 연마패드 및 무기계 응집제를 포함하는 연마 폐기물에서 세리아계 연마재를 재생하는 방법에 있어서,반응조에 상기 세리아계 연마재와 반응하여 염을 형성하지 않는 유기산 용액과 상기 연마 폐기물을 첨가하고 교반하여, 상기 유기산에 의한 산처리에 의하여 상기 무기계 응집제는 이온종으로 변화되고 상기 프릿 글래스 및 상기 연마패드는 부유되는 단계;부유된 상기 프릿 글래스 및 상기 연마패드를 제거하는 단계; 및세정 및 건조 공정을 수행하여 세리아계 연마재를 얻는 단계를 포함하며,상기 유기산의 pH는 0.5∼6.0 범위인 것을 특징으로 하는 세리아계 연마재 재생방법.
- 제1항에 있어서, 상기 반응조 내에 설치된 교반기로 교반하면서 상기 반응조 내에 설치된 초음파혼을 통해 초음파를 인가하고, 상기 초음파에 의해 상기 유기산과 상기 무기계 응집제의 화학 반응이 촉진되고 상기 초음파에 의해 발생된 기포가 격렬히 팽창하여 높은 압력으로 인해 그 한계점에서 터지고 기포가 터질 때의 충격파가 상기 연마 폐기물에 작용하여 세리아계 연마재 표면에 붙어있는 프릿 글래스와 연마패드가 세리아계 연마재 표면으로부터 박리되게 하는 초음파 처리 단계를 더 포함하는 세리아계 연마재의 재생방법.
- 제1항에 있어서, 상기 반응조 내에 설치된 교반기로 교반하면서 반응조 하부에 구비된 기포발생장치를 이용하여 공기를 주입하여, 기포를 발생시키고 그 기포가 터지는 충격파 또는 기포가 부상하는 힘에 의해 프릿 글래스 및 연마패드를 세리아계 연마재 표면으로부터 떼어내어 부상시키는 기포처리 단계를 더 포함하는 세리아계 연마재의 재생방법.
- 제1항에 있어서, 상기 산처리 후에,재생 공정 중에 혼입된 이물질 및 부유된 상기 프릿 글래스와 연마패드를 필터링하기 위해 습식 진동 체분급을 수행하는 단계를 더 포함하고,상기 습식 진동 체분급은 50∼2000메쉬 체로 체거름하는 것을 특징으로 하는 세리아계 연마재의 재생방법.
- 제1항에 있어서, 상기 프릿 글래스와 상기 연마패드를 제거하는 단계 후에,세리아계 연마재에 잔류하는 프릿 글래스를 녹이기 위하여 알칼리 용액을 첨가하여 알칼리 처리하는 단계를 더 포함하며,상기 알칼리 용액은 수산화나트륨, 수산화칼륨, 암모니아, 탄소수 1~10인 1차 아민, 2차 아민 및 3차 아민 중에서 선택된 적어도 1종 이상의 알칼리 화합물을 사용하고, 상기 알칼리 처리는 pH가 9∼13 범위에서 이루어지며, 상기 세리아계 연마재와 알칼리 용액의 중량비가 1:0.5∼10 범위가 되게 상기 알칼리 용액을 첨가하여 프릿 글래스를 선택적으로 제거하는 것을 특징으로 하는 세리아계 연마재의 재생방법.
- 제1항에 있어서, 상기 무기계 응집제는 황산알루미늄, 폴리염화알루미늄, 암모늄명반, 알루민산나트륨, 황산제1철, 황산제2철 또는 염화제2철로 이루어진 것을 특징으로 하는 세리아계 연마재의 재생방법.
- 제1항에 있어서, 상기 유기산 용액은 초산, 젖산, 구연산 및 옥살산 중에서 선택된 적어도 1종 이상의 산을 포함하는 것을 특징으로 하는 세리아계 연마재의 재생방법.
- 제1항에 있어서, 상기 유기산 용액으로 산처리 후에,상기 유기산 용액과 성분이 다른 유기산 용액을 사용하여 2차 산처리를 수행하는 단계를 더 포함하는 세리아계 연마재의 재생방법.
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CN104619806A (zh) * | 2012-09-17 | 2015-05-13 | 株式会社Lg化学 | 含氧化铈废磨料的再生方法 |
EP3633006A4 (en) * | 2017-06-01 | 2021-02-24 | JGC Catalysts and Chemicals Ltd. | INORGANIC OXIDE FINE PARTICLES CONTAINING NANOBULLES, AND POLISHING AGENT INCLUDING THESE |
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KR101411926B1 (ko) * | 2012-06-05 | 2014-06-26 | 주식회사 랜코 | 세리아계 연마재 폐기물을 재활용한 산화세륨의 제조방법 |
JP5943529B2 (ja) * | 2012-09-13 | 2016-07-05 | エルジー・ケム・リミテッド | セリア含有廃研磨材の再生方法 |
WO2014042430A1 (ko) * | 2012-09-13 | 2014-03-20 | 주식회사 엘지화학 | 세리아 함유 폐연마재의 재생 방법 |
WO2014042431A1 (ko) * | 2012-09-14 | 2014-03-20 | 주식회사 엘지화학 | 세리아 함유 폐연마재의 재생 방법 |
WO2014042494A1 (ko) * | 2012-09-17 | 2014-03-20 | 주식회사 엘지화학 | 세리아 함유 폐연마재의 재생 방법 |
KR101486439B1 (ko) * | 2013-04-15 | 2015-01-27 | 한국세라믹기술원 | 세리아계 연마재 폐기물을 재활용한 탄산세륨의 제조방법 |
JP5967246B2 (ja) * | 2015-04-03 | 2016-08-10 | 信越化学工業株式会社 | 酸化セリウムの回収方法 |
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