DE3503097A1 - Process for purifying silicon - Google Patents

Process for purifying silicon

Info

Publication number
DE3503097A1
DE3503097A1 DE19853503097 DE3503097A DE3503097A1 DE 3503097 A1 DE3503097 A1 DE 3503097A1 DE 19853503097 DE19853503097 DE 19853503097 DE 3503097 A DE3503097 A DE 3503097A DE 3503097 A1 DE3503097 A1 DE 3503097A1
Authority
DE
Germany
Prior art keywords
silicon
phosphorus
arc furnace
möller
added
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.)
Withdrawn
Application number
DE19853503097
Other languages
German (de)
Inventor
Wolfgang Dr.rer.nat. 8000 München Keller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE19853503097 priority Critical patent/DE3503097A1/en
Publication of DE3503097A1 publication Critical patent/DE3503097A1/en
Withdrawn legal-status Critical Current

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
    • C01B33/021—Preparation
    • C01B33/023—Preparation by reduction of silica or free silica-containing material
    • C01B33/025—Preparation by reduction of silica or free silica-containing material with carbon or a solid carbonaceous material, i.e. carbo-thermal process
    • 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

Landscapes

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

Abstract

Silicon prepared metallurgically in an arc furnace generally does not have the purity required for the fabrication of solar cells. Particular problems are caused by the high sulphur and phosphorus contents. Added lime or dolomite reacts with sulphur and phosphorus to give calcium sulphate and calcium phosphate, respectively, and remains in the slag.

Description

Verfahren zum Reinigen von SiliciumProcess for cleaning silicon

Zur Verwendung für Solarzellen geeignetes Silicium muß preiswert herstellbar sein. Zur Herstellung solchen Siliciums gibt es eine Vielzahl von Vorschlägen. Viele dieser Verfahren sehen die metallurgische Herstellung von Silicium im Lichtbogenofen vor. Dazu werden relativ billige Ausgangsstoffe wie Quarzsand und bestimmte Kohlenstoffmodifikationen, wie z. B. gepreßter RuR, verwendet. Im Lichtbogenofen wird der Quarzsand nach der vereinfachten Bruttoformel zu Silicium reduziert.Silicon suitable for use in solar cells must be inexpensive to produce. A large number of proposals have been made for producing such silicon. Many of these processes involve the metallurgical production of silicon in an electric arc furnace. For this purpose, relatively cheap raw materials such as quartz sand and certain carbon modifications, such as. B. pressed RuR is used. In the electric arc furnace, the quartz sand is made according to the simplified gross formula reduced to silicon.

Hierbei entsteht flüssiges Silicium, das der Weiterverarbeitung zugeführt werden kann. Dieses Silicium enthält im allgemeinen relativ hohe Anteile von Verunreinigungen.This creates liquid silicon, which is fed to further processing can be. This silicon generally contains relatively high levels of impurities.

Man ist daher gezwungen, dieses Silicium zu reinigen. Zum Reinigen können die bekannten Zonenreinigungsverfahren verwendet werden. Es wurde auch bereits vorgeschlagen, das erstarrte Silicium mechanisch zu zerkleinern und das zerkleinerte Silicium derart chemisch zu behandeln, daß die Verunreinigungen entfernt werden. Die bekannten Verfahren sind jedoch teuer und erfordern zusätzliche Arbeitsgänge nach dem Erschmelzen des Siliciums.One is therefore forced to purify this silicon. For cleaning the known zone cleaning methods can be used. It was already proposed to mechanically crush the solidified silicon and the crushed To chemically treat silicon in such a way that the impurities are removed. However, the known methods are expensive and require additional operations after melting the silicon.

Besonders häufig und in großen Anteilen vorkommende Verunreinigungen sind Phosphor und Schwefel.Contaminants that occur particularly frequently and in large proportions are phosphorus and sulfur.

Die Erfindung bezieht sich auf ein Verfahren zum Reinigen von im Lichtbogenofen aus einem Siliciumverbindungen unc Kohlenstoff enthaltenden Möller hergestellten Silicium.The invention relates to a method for cleaning in the electric arc furnace made of a silicon compound unc carbon containing Möller Silicon.

Der Erfindung liegt die Aufgabe zugrunde, die Verunreinigungen Phosphor und Schwefel durch ein besonders einfaches und billiges Verfahren bereits im Lichtbogenofen aus dem Silicium zu entfernen.The invention is based on the object of removing the impurities phosphorus and sulfur by a particularly simple and cheap process already in the electric arc furnace to remove from the silicon.

Diese Aufgabe wird dadurch gelöst, daß dem Möller Kalzium enthaltende Stoffe zugegeben werden. Diese Stoffe können beispielsweise Kalkstein oder Dolomit selen.This object is achieved in that the Möller contains calcium Substances are added. These substances can be limestone or dolomite, for example selenium.

Das Verfahren wird so ausgeführt, daß dem beispielsweise aus Quarzsand und brikettiertem Ruß bestehenden Möller vor der Beschickung des Ofens die genannten Zuschlagsstoffe Kalkstein (CaC03) oder Dolomit (CamMgn(CO3)p) zugemischt werden. In der Schmelze verbinden sich die Zuschlagstoffe mit den Verunreinigungen Schwefel und Phosphor. Phosphor und Schwefel reagieren dabei unter Bildung von Kalziumphosphat bzw. Kalziumsulfat und verbleiben in der Schlacke. Das schmelzflüssige Silicium ist damit relativ frei von den genannten Verunreinigungen und kann dann unmittelbar, gegebenenfalls unter Anwendung weiterer Reinigungsverfahren, weiter verarbeitet werden. Als zweckmäßig hat sich ein Zuschlag von 1 bis 10 Gewichtsprozent der genannten Stoffe zum Möller herausgestellt.The method is carried out in such a way that the quartz sand, for example and briquetted soot present the aforesaid before the furnace is charged Aggregates limestone (CaC03) or dolomite (CamMgn (CO3) p) are added. In the melt, the aggregates combine with the sulfur impurities and phosphorus. Phosphorus and sulfur react to form calcium phosphate or calcium sulfate and remain in the slag. The molten silicon is therefore relatively free of the named impurities and can then immediately, further processed if necessary using further cleaning methods will. An addition of 1 to 10 percent by weight of the above has proven to be expedient Materials highlighted on Möller.

4 Patentansprüche4 claims

Claims (4)

Patentansprüche 1. Verfahren zum Reinigen von im Lichtbogenofen aus einem Siliciumverbindungen und Kohlenstoff enthaltenden Möller hergestellten Silicium, d a d u r c h g e k e n n -z e i c h n e t , daß dem Möller Kalzium enthaltende Stoffe zugegeben werden.Claims 1. A method for cleaning in the arc furnace silicon produced by a moler containing silicon compounds and carbon, d u r c h g e k e n n -z e i c h n e t that the Möller calcium-containing Substances are added. 2. Verfahren nach Anspruch 1, g e k e n n z e i c h -n e t durch Zugabe von Kalkstein (CaCO3).2. The method according to claim 1, g e k e n n z e i c h -n e t by adding of limestone (CaCO3). 3. Verfahren nach Anspruch 1, g e k e n n z e i c h -n e t durch die Zugabe von Dolomit (CamMgn(CO3)p).3. The method according to claim 1, g e k e n n z e i c h -n e t by the Addition of dolomite (CamMgn (CO3) p). 3p 3p 4. Verfahren nach einem der Ansprüche 1 bis 3, d a -d u r c h g e k e n n z e i c h n e t , daß dem Möller 1 bis 10 Gewichtsprozent der genannten Stoffe zugegeben werden.4. The method according to any one of claims 1 to 3, d a -d u r c h it is not noted that the Möller 1 to 10 percent by weight of the above Substances are added.
DE19853503097 1985-01-30 1985-01-30 Process for purifying silicon Withdrawn DE3503097A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19853503097 DE3503097A1 (en) 1985-01-30 1985-01-30 Process for purifying silicon

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853503097 DE3503097A1 (en) 1985-01-30 1985-01-30 Process for purifying silicon

Publications (1)

Publication Number Publication Date
DE3503097A1 true DE3503097A1 (en) 1986-07-31

Family

ID=6261182

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853503097 Withdrawn DE3503097A1 (en) 1985-01-30 1985-01-30 Process for purifying silicon

Country Status (1)

Country Link
DE (1) DE3503097A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0272777A2 (en) * 1986-12-22 1988-06-29 Dow Corning Corporation Addition of calcium compounds to the carbothermic reduction of silica
DE10358452A1 (en) * 2003-12-13 2005-07-21 Fiolitakis, Emmanuel, Dr. Preparation of high-quality silicon, useful e.g. as solar or semiconductor silicon, by high-temperature reaction of lime, carbon and silicate, then purification and thermal decomposition of the calcium silicide formed
CN110156024A (en) * 2019-06-14 2019-08-23 宝兴易达光伏刃料有限公司 A method of HIGH-PURITY SILICON is refined by metallic silicon

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0272777A2 (en) * 1986-12-22 1988-06-29 Dow Corning Corporation Addition of calcium compounds to the carbothermic reduction of silica
EP0272777A3 (en) * 1986-12-22 1989-03-15 Dow Corning Corporation Addition of calcium compounds to the carbothermic reduction of silica
DE10358452A1 (en) * 2003-12-13 2005-07-21 Fiolitakis, Emmanuel, Dr. Preparation of high-quality silicon, useful e.g. as solar or semiconductor silicon, by high-temperature reaction of lime, carbon and silicate, then purification and thermal decomposition of the calcium silicide formed
DE10358452B4 (en) * 2003-12-13 2005-09-15 Fiolitakis, Emmanuel, Dr. Preparation of high-quality silicon, useful e.g. as solar or semiconductor silicon, by high-temperature reaction of lime, carbon and silicate, then purification and thermal decomposition of the calcium silicide formed
CN110156024A (en) * 2019-06-14 2019-08-23 宝兴易达光伏刃料有限公司 A method of HIGH-PURITY SILICON is refined by metallic silicon

Similar Documents

Publication Publication Date Title
EP0632791B1 (en) Process for producing cement from metallurgical slag
DE2926482A1 (en) METHOD FOR THE RECOVERY AND USE OF USEFUL SUBSTANCES FROM A METAL MELT
DE102017119675B4 (en) Process for the treatment of slag
EP0061012B1 (en) Process for producing desulfurizing agents for pig iron and steel melts
DD298001A5 (en) METHOD OF OBTAINING OXID Uranium
DE3215981A1 (en) METHOD FOR THE PRODUCTION OF HIGH-PURITY STARTING MATERIALS FOR THE PRODUCTION OF SILICON FOR SOLAR CELLS BY THE CARBOTHERMAL REDUCTION PROCESS
DE2716840C2 (en) Process for processing the slag from basic oxygen blower converters in steel production
DE2908570A1 (en) METHOD FOR RECOVERY OF VALUE METALS FROM CATALYSTS
DE2902914C2 (en)
DE3503097A1 (en) Process for purifying silicon
DE2255977A1 (en) METALLIC COPPER REFINING METHOD
DE3303694A1 (en) METHOD FOR PRODUCING ALUMINUM-SILICON ALLOYS
DE69605385T2 (en) HYDROMETALLURGICAL METHOD FOR CLEANING ROLL OXYDES BY LYING WITH SODIUM CARBONATE
DE19747896B4 (en) Process for valorising and possibly treating pan slags
DE69310464T2 (en) Process for extracting lead from raw materials containing lead
DE10016075C1 (en) Method of removing impurities in ion, involves separating iron and copper phase and copper in iron phase is removed by difference in specific gravity
DE69411402T2 (en) Process for recycling zinc and other metal residues containing valuable metals
DE407927C (en) Process for the production of aluminum, silicon or alloys of these substances
AT103895B (en) Process for the treatment of raw materials containing oxides.
DE625756C (en) Process for the desulfurization of ores containing iron sulfide
EP0164087B1 (en) Process for reducing the sulphuric acid and impurity content in wet-process phosphoric acid
DE553237C (en) Simultaneous production of aluminum oxide and phosphorus or phosphoric acid
DE69400730T2 (en) Checking the carbon balance in a silicon melting furnace using calcium monitoring
DE451523C (en) Process for cleaning highly refractory oxides, in particular aluminum oxide contained in bauxite or the like
DE247993C (en)

Legal Events

Date Code Title Description
8139 Disposal/non-payment of the annual fee