title: Evaluation of selected chemical processes for production of low-cost
 silicon (Phase III). Fifteenth quarterly progress report, April 1-June 30,
 1979
creator: Blocher, J.M. Jr.
creator: Browning, M.F.
publisher: Battelle Memorial Institute. Columbus Laboratories.
date: 1979-08-15
language: English
description: Progress has been made during this quarter on the assembly of the
 Process Development Unit (PDU) consisting of four of the critical components
 of the 50 MT/year Experimental Process System Development Unit (EPSDU) for the
 production of granular semiconductor-grade silicon by the zinc vapor reduction
 of silicon tetrachloride in a fluidized bed of seed particles. The target
 operation date of October 1, 1979, still appears attainable. An experimental
 wetted-wall condenser, about 1/10 the size of the PDU/EPSDU design was
 operated to demonstrate that recirculated liquid zinc chloride can indeed be
 used to wash down the condensed by-product of the fluidized-bed reactor
 containing finely divided solid zinc and some silicon dust. The temperature
 distribution proved to be more critical than anticipated but the condenser now
 appears to be operable. Some improvement in condensation efficiency is
 desirable, however. Procedures were established for safe handling of SiCl/sub
 4/ leaks and spills from the EPSDU and PDU. Preparations are being made to
 conduct zinc vaporization experiments in that portion of the PDU before
 operation of the entire PDU is initiated.
subject: Research Programs
subject: Elements
subject: Electrolytic Cells
subject: Solar Cells
subject: 36 Materials Science
subject: Zinc Chlorides
subject: Direct Energy Converters
subject: Efficiency
subject: Vapor Condensers
subject: Cleaning
subject: Semimetals
subject: Temperature Distribution
subject: Photovoltaic Cells
subject: Washing
subject: Production
subject: Silicon Chlorides
subject: Zinc Compounds
subject: Processing
subject: Silicon
subject: 14 Solar Energy
subject: Silicon Solar Cells
subject: Photoelectric Cells
subject: Silicon Compounds
subject: Halogen Compounds
subject: Cost
subject: 360601 -- Other Materials-- Preparation & Manufacture
subject: Design
subject: Chlorine Compounds
subject: Chlorides
subject: Zinc Halides 140501* -- Solar Energy Conversion-- Photovoltaic
 Conversion
subject: Halides
subject: Fluidized Bed
subject: Condensers
subject: Leaks
type: Report
format: 18 pages
format: Text
identifier: rep-no: DOE/JPL/954339-15
identifier: grantno: NAS-7-100-954339
identifier: doi: 10.2172/5848896
identifier: osti: 5848896
identifier: https://digital.library.unt.edu/ark:/67531/metadc1096828/
identifier: ark: ark:/67531/metadc1096828