GENERAL47956

• Permit No: M1988112
• IBM Index Class Name: General Documents
• Doc Name: THE RECOVERY OF CYANIDE FROM SLURRIES
• Media Type: D
• Archive: No

~; :_:
Item ~ ~ ~oLt per Tone of Ore

''
O~t't :' ~
C S 0.09
:.t::~:
a S 0.04
Electrlcair't S 0.02
- NaOH"' S 0.16
Operatof`t 5 0-Ot
S 0.31
1A Based on SO.Q4/Ib for 93% H=SO~.
m Based on 50.04/Ib CaO.
at Based on the current mine price of 50.04/kw-hr.
r't Based on 48% caustic solution at 50.18/Ib.
j6j 8ased on 535,000 per year.
The second mine Is a 3,500 ton/day operation exhibiting a slurry flow of 1,100 gpm and a wad cyanide level
of about 600 mg/I. The estimated capital and operating costs were 52,000,000 and 50.73/tone of ore
processed, respectively. A summary of the costs are present In Tables 15 and 16. Employing a cost of
50.70/Ib for NaCN and a 95% recovery, the recoverable value of cyanide was 52.83/ton of ore processed.
The net recovered value was 52.10/ton or 52,600,000/year. The corresponding costs for chemical treatment
were several dollars per ton of ore processed.
TABLE 15
ESTIMATED CAPITAL COST FOR CYANIDE RECOVERY
Item Total Cost
Stripping Towers S 75,000
. Absorber Towers .. .. _._ ., - 75,000 .
Tower Internals - -
Demisters •. 60,000
- Distributers _ . ._ .. . ' 60,000
Support Gratings • ~ 30,000
Packing 100,000
Reactors 35,000
Mixers 50.000
Fans 30,000
H,SO, Feed System + Storage 25,000
Lime Feed System + Storage 100,000
NaOH Feed System + Storage 15.000
Subtotal Equipment Costs S 655,000
Installation Factor x 3.0
TOTAL CAPITAL COST 51,965,000