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<br />I SECTION 3.0 <br /> PROCESS DATA <br /> Tailings pH Adjustment system <br />I <br />~ ~ ~ ~ <br /> Slurry flow rate 1,148 gpm fl;d ~.~',%' <br />'~~ <br /> Slurry solids concentration ,;c <br />49.5$ wt cy<< <br />I Particle size - d80 Y <br />100 µm ~)o ~ <br /> Solids S.G. 2.68 <br />I <br />NaCN in solution in feed slurry ~, - c <br />8o mg/1 D , = `•~~ ' , ,,.;" <br /> NaCN in solution in treated slurry: G~1.~:"' _„ <br /> - actual unknown L, ~,.!`^'' <br />• <br />I - design basis 10 mg/1 ,,. ~ • "' <br />i <br /> NaCN converted to HCN 29.5 lb/h ~ ~` ~ ~~ 3~% <br />" <br /> HCN evolved 16.2 lb/h ,,, ~' <br />. <br /> fL,.' Jt.e~9D <br />I No. of stages (tanks) R <br />one ~_•~„ ~ <br /> Retention time 15 min t~" <br /> Tank capacity (working) 16,900 gal <br /> Tank dimensions* 15' din. x <br /> 20' high <br /> Acid addition rate (continuous) 0.27 gpm <br />` 1.2 lb/t <br /> Acid concentration 93~ HZSO~ <br />r Initial pH 11.1 <br />^l Final pH 8.5 - 8.9 <br /> Air sparge rate 2,000 scfm <br /> Exhaust gas flow 2,750 scfm <br /> Absorber liquor NaoH solution <br /> Bleed from absorber as required <br />` Make-up solution 50~ NaOH <br /> Scrubber operating pH - (max) 11.5 <br /> - (min) 10.5 <br /> *Note: Tank dimensions include allowance for 20~ e:gpansion of <br />` <br />^- slurry volume to accommodate air holdup. <br />l <br />l <br />1 pj/1474rp 012591 3-1 <br />