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WO2021228371A1 - Procédé de production d'agglomérats contenant du dioxyde de silicium - Google Patents

Procédé de production d'agglomérats contenant du dioxyde de silicium Download PDF

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Publication number
WO2021228371A1
WO2021228371A1 PCT/EP2020/063147 EP2020063147W WO2021228371A1 WO 2021228371 A1 WO2021228371 A1 WO 2021228371A1 EP 2020063147 W EP2020063147 W EP 2020063147W WO 2021228371 A1 WO2021228371 A1 WO 2021228371A1
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Prior art keywords
silicon dioxide
silicon
agglomerates
agglomerate
particle size
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Ceased
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PCT/EP2020/063147
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German (de)
English (en)
Inventor
Karl-Heinz RIMBÖCK
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Wacker Chemie AG
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Wacker Chemie AG
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Priority to PCT/EP2020/063147 priority Critical patent/WO2021228371A1/fr
Publication of WO2021228371A1 publication Critical patent/WO2021228371A1/fr
Anticipated expiration legal-status Critical
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    • 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
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • the invention relates to a method for producing agglomerates containing silicon dioxide which are suitable for use in metallurgical processes.
  • the finely divided silicon dioxide-containing particle mixtures are mainly so-called microsilica (pSi0 2 ), which is obtained in large quantities as a dusty by-product in the production of technical silicon by carbothermal reduction (for example so-called metallurgical silicon and ferrosilicon) and is currently mainly in the Construction industry is used or dumped as a pozzolan additive in high-performance concrete.
  • microsilica pSi0 2
  • the silicon dioxide-containing material must meet certain physical, chemical and / or metallurgical criteria.
  • One of these criteria is the piece or particle size of the silicon dioxide-containing material.
  • a large part of the silicon dioxide to be recycled occurs as a finely divided particle mixture (dso ⁇ 100 ⁇ m), which is associated with considerable disadvantages (e.g. health / immission protection when handling dusty silicon dioxide [alveolar fraction of crystalline silicon dioxide from pSiCV; can be chronic in humans obstructive lung diseases and lung cancer]) or make it impossible to use it in certain processes (e.g. discharge from zones with high gas velocities due to particle sizes that are too small). It is therefore advantageous to subject such finely divided, silicon dioxide-containing particle mixtures to an agglomeration process.
  • Agglomeration is a process of mechanical grain enlargement.
  • the corresponding products of this process are called agglomerates, among which
  • Multi-body systems of solidified particles are to be understood.
  • a good to be agglomerated there are basically three methods in question:
  • agglomerates over finely divided particle mixtures are in general: higher bulk density, defined particle size distributions can be produced, better Flow and dosing behavior, avoidance / reduction of dust pollution and the associated health risk and loss of material, etc. In this way, procedural problems can be avoided, such as time consolidation and segregation of bulk materials.
  • the silicon carbide is broken down to a particle size of 32 ⁇ m.
  • Green pellets with a diameter of 1 to 4 mm, in most examples a mass ratio of silicon dioxide to silicon carbide of 3 to 1 and a water content of 10-15 are produced in a pelletizing drum from the aforementioned silicon dioxide and silicon carbide materials with the addition of water and without a binder % exhibit.
  • the green pellets are dried at 105 ° C. for 20 hours and then calcined in a muffle furnace at 1200 ° C. (heated in stages and then held at the final temperature for 15 minutes). Tangstad et al. leave open what the purity information of the starting materials used and the content information (e.g.
  • the particles with the described diameters of 1 to 4 mm are too small for use in metallurgical processes on an industrial scale.
  • the process does not lead to the desired properties of the particle mixtures for metallurgical processes.
  • the high energy consumption, which with the method according to Tangstad et al. is also disadvantageous.
  • Hakamada's group report on laboratory-scale investigations into partial reactions of the carbothermal reduction of amorphous silicon dioxide obtained by refining diatomite and crystalline silicon dioxide in the quartz modification (Hakamada et al., Metallurgical and materials transactions B 2010, 41B, 350-358 ) using the agglomerates produced with a graphite powder ( ⁇ 10 ⁇ m) or corresponding silicon carbide powder mixtures ("800 mesh", ie approx. ⁇ 20 ⁇ m). Both the amorphous and the crystalline material are covered Beginning in powder form (sub-pm for amorphous, ⁇ 30 pm for quartz).
  • X-ray diffractometry ensures that no modification impurities, ie no further crystalline modifications, are present in the starting materials.
  • the amorphous sub-pm particles are coagulated into larger particles of 3 to 10 pm by a preheating treatment that is not specified in more detail (heated in stages at approx. 227 ° C and 1227 ° C for an indefinite period of time).
  • Both silicon dioxide starting materials are mixed homogeneously with both graphite and silicon carbide, dry and in a molar ratio of 1: 1.
  • the agglomeration of the graphite variants takes place by means of briquetting, which is not defined in more detail, at 30 MPa, whereby agglomerates with a diameter of 7 mm, a thickness of 4 mm and a weight of 0.4 g are obtained, which are then placed in a MoSi2 resistance furnace under argon -Atmosphere at approx. 1500 ° C for an unspecified time ("a few hours") heated and brought to reaction and ultimately quenched in a helium gas stream.
  • a characterization with regard to further properties of the agglomerate and the agglomerate collective (for example, parameters The authors do not specify the agglomerate and agglomerate collective stability [for example with regard to breakage and abrasion; e.g. via pressure resistance and abrasion tests], porosity, etc.
  • the silicon carbide variants no agglomerates are specifically produced 100 mg of a corresponding powder mixture directly in a water-cooled high-temperature pulse Oven in graphite crucibles on a tantalum foil under a helium atmosphere to react.
  • no precise information is given on further framework conditions - for example, the temperature profile and holding time are missing.
  • the method according to Hakamada et al. disadvantageous is that the finely divided silicon dioxide-containing material has to be subjected to a preheating treatment at high temperatures. This leads to a sharp increase in manufacturing costs and thus also to an increase in the price of the secondary product, technical grade silicon. Specially manufactured raw materials for the production of technical silicon must also be competitive with conventional raw materials from both a process engineering and an economic point of view - both are important in agglomerates according to Hakamada et al. not given.
  • the present invention was therefore based on the object of providing a method which enables an agglomeration of finely divided silicon dioxide-containing particle mixtures without showing the disadvantages known from the prior art.
  • the invention relates to a process for the production of silicon dioxide-containing agglomerates which have a symmetry-weighted sphericity factor of at least 0.4, a compressive strength of at least 10 N / agglomerate and, with a particle size dso, M of 5 to 250 mm, a characteristic surface to-volume coefficient from 0 to 1.21 / mm which is calculated as follows:
  • a characteristic surface-to-volume coefficient of the silica-containing agglomerate [1 / mm] s m A mean, effective porosity of the silica-containing agglomerate d5o, M particle size (diameter) of the silica-containing agglomerate at 50% of the mass passage the grading curve [mm], in which a mixture of silicon dioxide-containing particles P with a dso ⁇ 100 ⁇ m, which in the dry state contain at least 90% by weight silicon dioxide and a specific surface area of 10 to 100 m 2 / g, has a mass ratio have between non-crystalline Si0 2 phase and by quantitative phase analysis by means of X-ray diffractometry, crystalline Si0 2 phases of at least 70/30, and water is agglomerated, the moist agglomerates obtained showing a water content of 10 to 60 wt .-% and the moist Agglomerates are then dried to form the agglomerates.
  • the method according to the invention can be used to produce agglomerates containing silicon dioxide, which are particularly suitable for use in metallurgical processes and which, in addition to the previously described, general advantages of particle mixtures of agglomerates over the corresponding finely divided particle mixtures show further advantages.
  • certain material properties of the goods produced according to the invention such as a regular shape, a defined porosity and an adjustable inner surface, are made possible.
  • the agglomerates show defined strengths with lower specific costs for energy and raw materials compared to those from the known method according to Tangstad et al. In metallurgical processes, the materials used are repeatedly subjected to different loads. Therefore, the strength of these materials is of particular importance.
  • Finely divided silicon dioxide-containing particles P are preferably used which, in the dry state, have an Si0 2 content, preferably at least 92% by weight, particularly preferably at least 93% by weight, in particular at least 95% by weight.
  • the silicon dioxide-containing particles P with a weight fraction of 0.5 to 10% by weight, particularly preferably 1 to 6% by weight, in the dry state, based on the total weight of the silicon dioxide-containing particles P, furthermore at least a compound selected from the group Al2O3, Fe 2 C> 3, CaO, MgO,
  • the purity or the silicon dioxide content of the silicon dioxide-containing particles P results as 100% by weight minus the weight proportions of possible secondary components selected from the group Al2O3, Fe203, CaO, MgO, Na2O, K2O , CI, C, P2O5, SO3.
  • a material is then deemed to be im It is in a dry state when the material has a water content of less than 0.5% by weight based on the total mass of the material examined.
  • the silicon dioxide-containing particles P preferably have an LOI (“loss on ignition”) of 0.5 to 5% by weight, particularly preferably 1 to 3% by weight.
  • the particles P are so-called pSiCt, which is obtained as a by-product in the production of technical grade silicon by means of carbothermal reduction of silicon dioxide at high temperatures (preferably 2000 ° C) in electric furnaces (e.g. electric arc reduction furnace).
  • the particles P are refined material from naturally occurring silicon dioxide sources (for example biogenic silicon dioxide), for example so-called refined kieselguhr or refined rice husk ash.
  • naturally occurring silicon dioxide sources for example biogenic silicon dioxide
  • refined kieselguhr or refined rice husk ash for example so-called refined kieselguhr or refined rice husk ash.
  • the mass ratio between non-crystalline (amorphous) and crystalline silicon dioxide fractions is preferably at least 80/20, particularly preferably at least 85/15, in particular at least 90/10 based on the total mass of Si0 2 .
  • the proportion of amorphous Si0 2 phase results from 100% by weight (total mass of Si0 2 ) minus the proportions by weight (in% by weight) of the crystalline Si0 2 phases detectable by quantitative phase analysis using X-ray diffractometry.
  • phase should be understood to mean a chemical-physical system which shares a common intra- or intermolecular structure, regardless of any further subdivision with regard to size distribution or shape.
  • the silicon dioxide-containing particles P preferably have a specific surface area of 15 to 95 m 2 / g, particularly preferably 20 to 90 m 2 / g, in particular 20 to 80 m 2 / g.
  • the agglomerates produced by the method according to the invention have a preferred particle size parameter dso, M of at most 250 mm.
  • the particle size parameter dso, M is preferably in the range from 7 to 150 mm, particularly preferably from 8 to 100 mm, in particular from 10 to 50 mm.
  • a binder is added to the mixture during agglomeration, the mass ratio between silicon dioxide-containing particles and binder in the mixture preferably being from 25/75 to 99.9 / 0.1.
  • Binders are preferably selected from material containing silicon metal, silicas, silicates / silicate minerals, aluminates, zirconates, calcium oxide, calcium hydroxide, binders containing organic compounds or mixtures thereof. Examples of common binders are:
  • Inorganic binders For example silicon metal, bentonite, montmorillonite, cement, building lime, olivine, clay, water glass, dolomite.
  • Organic binders For example dextrins, thermosetting plastics, processed or natural oils, cellulose or cellulose derivatives.
  • a silicon metal-containing material is preferably used as the binder, which has a particle size parameter d 50 of at most 250 ⁇ m and, in the dry state, a silicon metal content of at least 10% by weight.
  • a silicon metal-containing material is preferably used as the binder, which has a particle size parameter d 50 of at most 250 ⁇ m and, in the dry state, a silicon metal content of at least 10% by weight.
  • the silicon-metal-containing material is preferably silicon residues, which are preferably selected from by-products or wastes from the silicon-producing or processing industries, e.g.
  • silicon such as poly-, multi- or single-crystal silicon
  • the mechanical processing can in particular involve breaking and / or grinding.
  • Typical classification methods are, for example, sieving and / or sifting;
  • this can be a neutralized contact mass from chlorosilane reactors, before and / or after recovery of Cu; in particular the Müller-Rochow direct synthesis, hydrochlorination or low-temperature conversion of silanes.
  • a purification of this silicon-metal-containing material before use in the process according to the invention is usually not necessary, ie the silicon-metal-containing material Materials can be used without any further cleaning steps.
  • the agglomeration of the particles P preferably takes place in ambient air.
  • the agglomeration is preferably carried out by means of build-up agglomeration via pelletizing drums or pelletizing plates (pelletizer, with or without addition of water) and optionally an upstream mixer (with or without addition of water).
  • pelletizing drums or pelletizing plates pelletizer, with or without addition of water
  • upstream mixer with or without addition of water
  • the individual steps of the process are shown schematically in FIG. 1 using technological flow diagrams.
  • the starting materials silicon dioxide-containing particle mixture P (ShP) and, if necessary, binding agent (additive, A) can be added together or separately from one another - the addition is carried out manually or automatically.
  • A can also be added partially or completely to the pelletizer (PE).
  • the agglomerated material (AG) is removed from the pelletizer (PE) and then dried (dryer TR, for example rotary dryer) in order to obtain the dried AG (GAG). It can be preferred here to subject the GAG to a classification step (classifier KL, for example sieves or sifter) in order, for example, to set more precise particle size distributions, a classified GAG (KGAG) being generated. Under certain circumstances (such as undesirable properties of the particles or the particle mixture of the AG) it is advisable to subject the AG to a classification step before it is dried. Fractions separated off in the classifiers (KL) are optionally comminuted (comminution, for example by grinding or crushing) and added again to the mixer (M).
  • KL classification step
  • Fractions separated off in the classifiers (KL) are optionally comminuted (comminution, for example by grinding or crushing) and added again to the mixer (M).
  • the agglomeration is carried out by means of press agglomeration via briquetting presses (BR) (for example roller presses, press chambers, or extrusion presses) and an upstream mixer (with or without addition of water).
  • BR briquetting presses
  • the individual steps of the process are shown schematically in FIG. 2 using technological flow diagrams.
  • the starting materials silicon dioxide-containing particle mixture P (ShP) and optionally binding agent (additive, A) can be added to the mixer (M) together or separately - the addition is carried out manually or automatically.
  • the agglomerated goods (AG) are produced using a briquetting press (BR).
  • the AG is then dried to obtain the dried AG (GAG).
  • GAG GAG
  • ZE comminution
  • KL classification step
  • sieves or sifter a classification step
  • KGAG classified GAG
  • the moist agglomerates are preferably dried at a temperature of at most 1500 ° C., preferably at most 1300 ° C., particularly preferably at most 1200 ° C., in particular at most 1000 ° C. for a period of 5 minutes to 24 hours, preferably for 10 minutes to 12 hours h, particularly preferably for 15 min to 6 h, in particular 20 min to 3 h.
  • the agglomeration takes place via bulk drying or sintering at a temperature of at most 1500 ° C., preferably at most 1300 ° C., particularly preferably at most 1200 ° C., in particular at most 1000 ° C. and a subsequent comminution step.
  • the individual steps of the process are shown schematically in FIG.
  • a classification step for example sieves or sifter
  • KGAG classified GAG
  • the agglomerates produced according to the invention are distinguished by the following properties:
  • GAG & KGAG o a SiCt content of at least 25% by weight o a particle size parameter dso, M of at least 5 mm and at most 250 mm; preferably in the range from 7 to 150 mm, particularly preferably from 8 to 100 mm, in particular from 10 to 50 mm o Average, mass-weighted, effective porosity: from 0 to 1, preferably from 0.05 to 0.95, particularly preferably from 0.1 to 0.85, very particularly preferably from 0.15 to 0.75, in particular from 0.2 to 0.7 o water content of at most 0.5% by weight o compressive strength, maximum loading of 10 to 3500 N / agglomerate o symmetry-weighted sphericity factor of the agglomerates is at least 0.4, preferably at least 0.5 , particularly preferably at least 0.6, in particular at least 0.7 and at most 1 o bulk density from 0.2 to 2.5 g / cm 3 , preferably from 0.25 to 2.0 g / cm 3 ,
  • Agglomerate AG is at least 0.4, preferably at least 0.5, particularly preferably at least 0.6, in particular at least 0.7 and at most 10 bulk density of 0.2 to 2.5 g / cm 3 , preferably from 0.25 to 2.0 g / cm 3 , particularly preferably from 0.3 to 1.2 g / cm 3 , in particular from 0.35 to 1.0 g / cm 3 .
  • agglomerates produced according to the invention can be used, for example, in the following metallurgical processes:
  • the agglomerates produced according to the invention are preferably used in industrial furnaces selected from the group consisting of electric arc furnaces, shaft furnaces (for example cupola furnaces) and induction furnaces.
  • the agglomerates containing silicon dioxide completely or partially substitute the silicon dioxide raw materials normally used in the respective processes, such as, for example, quartz in the production of metallurgical silicon by means of carbothermal reduction.
  • the physical and chemical properties of the silicon dioxide-containing particles P as well as the composition and the corresponding weight proportions of the components are determined in accordance with the standards NS-EN 13263-1, NS-EN 13263-2 and NS-EN 196-6.
  • Standard methods for determining the Si0 2 content are, for example, the X-ray fluorescence analysis according to DIN 51001 or the wet chemical analysis by digestion with hydrofluoric acid according to DIN EN 12902.
  • the determination of element contents can generally, for example, using X-ray fluorescence analysis (XRF), ICP-based analysis methods (ICP -MS, ICP-OES) or atomic absorption spectrometry (AAS).
  • sieve analyzes are usually carried out in order to characterize the particle mixture.
  • the determination of the particle size distribution by means of sieve analysis is carried out according to DIN 66165.
  • Particle size distributions can be carried out according to DIN ISO 9276-2.
  • the particle size distributions are determined according to ISO 13320 (laser diffraction) and / or ISO 13322 (image analysis). Average particle sizes / diameters can be calculated from particle size distributions in accordance with DIN ISO 9276-2.
  • the total porosity of a substance is made up of the sum of the cavities that are connected to each other and to the environment (open porosity; here, in this one Invention: effective porosity) and the non-interconnected cavities (closed porosity).
  • the porosity measurements are based on the Archimedes' principle and is carried out in accordance with ASTM C373-88.
  • the porosity of a material can be calculated from the absolute and the apparent density.
  • the absolute and the apparent density can be determined by means of weight measurement and volume measurement by means of gas pycnometers. The determination of the density of solid substances is described in DIN 66137-2: 2019-03.
  • the symmetry-weighted sphericity factor results from the product of the symmetry factor and sphericity. Both shape parameters can be determined, for example, by means of dynamic image analysis in accordance with ISO 13322, the values obtained representing the volume-weighted mean over the respective sample of the corresponding particle mixture.
  • the sphericity of a particle describes the relationship between the surface area of a particle image and the circumference. Accordingly, a spherical particle would have a sphericity close to 1, while a jagged, irregular particle image would have a roundness close to zero.
  • the center of gravity of a particle image is first determined.
  • the bulk density is defined as the density of a mixture of a particulate solid (so-called bulk material) and a continuous fluid (e.g. air), which fills the spaces between the particles.
  • the bulk density can be determined by the ratio of the mass of the bulk to the bulk volume in accordance with DIN ISO 697.
  • the compressive strength is the resistance of the agglomerate to the action of a uniaxial
  • the agglomerate produced according to the invention is compressed in a stable position in a pressure testing system between two flat, parallel punches, the control being carried out by reducing the distance between the punches. This can be carried out, for example, with the “81801” universal tension and compression testing machine from “Karl Frank GmbH”. Determination methods are described in various standards for comparable materials; for iron ore pellets, for example in ASTM E382-12 or ISO 4700: 2015.
  • a silicon dioxide-containing particle mixture (ShP, 96.5% w Si0 2 , 0.08% w Fe 2 0 3 , 0.18% w A1 2 0 3 , 0.34% w CaO, 0.22% w MgO, 0.45% w K 2 0,
  • Si0 2 (amorphous) / Si0 2 (crystalline) 96/4) transferred into a pelletizing drum with a diameter of 0.7 m. At most 1% by weight of the silicon dioxide-containing particle mixture has a particle size of> 45 ⁇ m. If a binding agent (additive A) is added to the ShP, a mixing step takes place before it is added to the pelletizing drum, which results in a pelletizing mixture (PM).
  • the ShP or the PM has
  • a total weight of 1 kg is added to the pelletizing drum.
  • the ShP or the PM is wetted and kept moist with water by spraying it.
  • the agglomeration process is ended.
  • the agglomerated material (AG) obtained in this way is transferred to a rotary dryer, the dryer being heated with a temperature ramp of 30 ° C./min until a temperature of 900 ° C. is reached. The latter is held for 30 minutes.
  • the dried, agglomerated material (GAG) is then obtained and has the properties given in Table 1.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Silicon Compounds (AREA)

Abstract

L'invention concerne un procédé de production d'agglomérats contenant du dioxyde de silicium présentant un facteur de sphéricité pondéré par symétrie d'au moins 0,4, une résistance à la compression d'au moins 10 N/agglomérat, et un coefficient de surface spécifique au volume de 0 à 1,2 l/mm pour une taille de particule d50 ,M de 5 à 250 mm, ledit coefficient étant calculé comme suit : une équation ωΑ = 6∙(1-εm,A)/d50,A (1), où ωΑ est le coefficient de surface spécifique au volume de l'agglomérat contenant du dioxyde de silicium [l/mm], εm,A est la porosité effective moyenne de l'agglomérat contenant du dioxyde de silicium, et d50,M est la taille des particules (diamètre) de l'agglomérat contenant du dioxyde de silicium à 50 % du débit massique dans la courbe de gradation [mm], un mélange des particules contenant du dioxyde de silicium P avec une d50 < 100 μm, qui contiennent au moins 90 % en poids de dioxyde de silicium à l'état séché et ont une surface spécifique de 10 à 100 m2/g et un rapport en masse de phase SiO2 non cristalline à des phases SiO2 cristallines, qui peut être détectée au moyen d'une analyse de phase quantitative au moyen d'un diffractomètre à rayons X, d'au moins 70/30, et de l'eau sont agglomérées, les agglomérats humides obtenus ayant une teneur en eau de 10 à 60 % en poids et étant ensuite séchés afin de former les agglomérats.
PCT/EP2020/063147 2020-05-12 2020-05-12 Procédé de production d'agglomérats contenant du dioxyde de silicium Ceased WO2021228371A1 (fr)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN119657319A (zh) * 2025-02-20 2025-03-21 山西宇通碳素有限公司 一种基于工艺调优的阴极碳素磨粉设备控制方法及系统
CN119899024A (zh) * 2023-10-26 2025-04-29 内蒙古鑫元硅材料科技有限公司 一种微硅粉颗粒的成型方法及其应用

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DE102012211121A1 (de) * 2012-06-28 2014-01-02 Evonik Industries Ag Granuläre, funktionalisierte Kieselsäure, Verfahren zu deren Herstellung und deren Verwendung
WO2017103124A2 (fr) * 2015-12-18 2017-06-22 Heraeus Quarzglas Gmbh & Co. Kg Augmentation de la teneur en silicium lors de la fabrication de verre de silice
WO2017192372A1 (fr) * 2016-05-04 2017-11-09 Saudi Arabian Oil Company Procédés de traitement d'oxydes métalliques sublimés

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WO2012060285A1 (fr) * 2010-11-02 2012-05-10 株式会社トクヤマ Corps granulé de sable siliceux et son procédé de fabrication
DE102012211121A1 (de) * 2012-06-28 2014-01-02 Evonik Industries Ag Granuläre, funktionalisierte Kieselsäure, Verfahren zu deren Herstellung und deren Verwendung
WO2017103124A2 (fr) * 2015-12-18 2017-06-22 Heraeus Quarzglas Gmbh & Co. Kg Augmentation de la teneur en silicium lors de la fabrication de verre de silice
WO2017192372A1 (fr) * 2016-05-04 2017-11-09 Saudi Arabian Oil Company Procédés de traitement d'oxydes métalliques sublimés

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Title
HAKAMADA ET AL., METALLURGICAL AND MATERIALS TRANSACTIONS B, vol. 41B, 2010, pages 350 - 358
M. TANGSTAD ET AL.: "Reaction Rates of 2Si0 +SiC=3SiO+CO'' in Pellets at Elevated Temperatures", ASPECTS MIN. MINER. SEI., vol. 3, 2019, pages 385 - 395

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119899024A (zh) * 2023-10-26 2025-04-29 内蒙古鑫元硅材料科技有限公司 一种微硅粉颗粒的成型方法及其应用
CN119657319A (zh) * 2025-02-20 2025-03-21 山西宇通碳素有限公司 一种基于工艺调优的阴极碳素磨粉设备控制方法及系统

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