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TABLE B ' <br />RESULTS OF 7HE CONTINUOUS FLOW PILOT PLANT STUDY USING COMPLETE MIX REACTORS <br />Influertt Alr Flux Complete Mix <br />~ Aeration Period Effluent <br />• CN' •rt~/rtfimin Reactor Staae <br />' <br />' <br />. (mini ~Pf <br />198 ~4.5 ..,. t.: <br />' <br />1 63 33 <br /> • 2 125 11 <br />•~ 3 187 27 <br /> 4 250 25 <br /> 5 312 24 <br />179 6.2 1 63 :'1 <br /> 2 125 :'0 <br /> 3 t87 17 <br /> 4 249 18 <br /> 5 312 14 <br />171 8.8 1 63 16 <br /> 2 125 15 <br /> 3 187 16 <br />In the second phase of the study, the recovery of cyanide from slurries was investigated us!ng a packed <br />~~ tower. A schematic of the tower is presented In Figure 5. The tower was packed with at3otn 3m of either <br />50 or 75mm plastic media. The influent distribution system consisted of a ceramic multiple weir trough <br />assembly and a demister. The media was supported by a multiple beam ceramic gas injection plate. The <br />stripping column was about 0.5m In dtameter and 6m In height. The parameters investigated included mass <br />transfer efficiency, media size, air to liqukf ratios, flooding characteristics, cyanide removal efti~iencies, and <br />' required packing height.- A summary of the tower performance is presented in Tabfe 9. <br />TAB1J= 4 <br />PILOT PLANT STRIPPER TOWER TEST RESULTS <br /> <br />Test Run No. ~ t 2 ~ 7 ~ ~ ~ ~ ~ ~ 5 ~ ~ ~ 6 7 6 ~ ~ ~ ~. <br />Shirty Fb~jj hr) 2.77 2.77 1.94 . 2.17 254 2.1 2.21 2.73 279 <br />Air Fbw (m'/hr1 645 043 679 B79 B39 2126 2126 14&1 1400 <br />No. of Tower Pusea 1 1 1 _ 1 -. 1 1 1 1 2 -- <br />_ <br />AirJL.{quld Ret1o ~' ~~~~--737 737 432 767 330 7012 962 is 637 506 <br />InOuenl WAD CN" 182 162 156 166.4 166,4 1924 192.1 197.6 19.1 <br />Effluent WAO CN" 76.6 24,5 45.1 23.5 22.7 73 13.7 18.3 5.6 <br />Tact Run No. <br />- <br />- 9 10 11 12 13 <br />Slurry Fb <br />w;mT 27e 245 4.1 4.0 4.1T 4.0 3.6 3.7 S.0 4.8 <br />Air Fbw (m !tv) 1815 1615 2177 2137 2561 2381 1364 1364 1682 7682 <br />No. of Towar Passes 1 2 1 2 1 2 1 2 1 2 <br />Air/Uquld Rel'w lf&1 B39 b71 534 8t9 643 349 769 7J6 365 <br />_ <br />Influent WAD CN 223.8 220 174 23 197 22 779 73 104 35 <br />E0luent WAD CN" 23.9 6.0 29 7.0 28 7.0 4J 17 40 14 <br />At air to Iiqukf ratios 01 about 500-700, Influent WAD cyanide concentrations ranging from 174-224 mg/I were <br />eftectMely reduced to <t0.0 mgil In two passes of the tower packed with the 75mm media. Wilh the SOmm <br />