EVALUATION OF SELECTED CHEMICAL PROCESSES FOR PRODUCTION OF LOW-COST SILICON. PHASE III Fifteenth Quarterly Progress Report for April 1—June 30,1979

摘要

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), to be operated full scale but in an 8-hour batch mode. The target operation date of October 1, 1979, still appears attainable.nAn 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 antici¬pated but the condenser now appears to be operable. Some improvement in condensation efficiency is desirable, however.