EP 3565782 A1 20191113 - REFINING PROCESS FOR PRODUCING SOLAR SILICON, SILICON CARBIDE, HIGH-PURITY GRAPHITE AND HOLLOW SILICA MICROSPHERES
Title (en)
REFINING PROCESS FOR PRODUCING SOLAR SILICON, SILICON CARBIDE, HIGH-PURITY GRAPHITE AND HOLLOW SILICA MICROSPHERES
Title (de)
RAFFINIERUNGSVERFAHREN ZUR HERSTELLUNG VON SOLARSILICIUM, SILICIUMCARBID, HOCHREINEM GRAPHIT UND HOHLEN SILICIUMDIOXIDMIKROKÜGELCHEN
Title (fr)
PROCÉDÉ DE RAFFINAGE POUR LA PRODUCTION DE SILICIUM SOLAIRE, DE CARBURE DE SILICIUM, DE GRAPHITE DE GRANDE PURETÉ ET DE MICROSPHÈRES CREUSES DE SILICE
Publication
Application
Priority
- US 201715399592 A 20170105
- US 2017060380 W 20171107
Abstract (en)
[origin: WO2018128708A1] A process for producing solar grade silicon from an impurity containing silica employs a plurality of plasma furnaces to perform a sequence of chemical reactions together with other process steps to produce solar grade silicon. The plasma furnace generates a stable dirty air, donut-shaped plasma into which particulate matter can be introduced. The plasma in the first two stages is formed by gases from the chemical reactions and in the third from inert gasses. Cyclone separators are used to extract particulates from the plasma in an inert gas that prevents reverse reactions as the particular cools.
IPC 8 full level
C01B 32/205 (2017.01); C01B 32/97 (2017.01); C01B 33/025 (2006.01); C01B 33/18 (2006.01)
CPC (source: EP)
C01B 32/205 (2017.07); C01B 32/97 (2017.07); C01B 33/025 (2013.01); C01B 33/18 (2013.01); C01P 2004/34 (2013.01)
Citation (search report)
See references of WO 2018128708A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
DOCDB simple family (application)
US 2017060380 W 20171107; EP 17801231 A 20171107