GOLD ORE DIRECT LEACHING CIRCUIT

Ore processing site

Source

material

0-200 mm,

20 t/h

Crushing 1

Jaw crusher

ЩДП-2,5х9

The

hopper of

7 m3 with

the tray

feeder

0-5 mm

20 t/h

5-40mm

40 t/h

Grinding complex

КИ-1,6

Unbalanced-throw

screen

ГИС-41

0-40 мм,

60 т/ч

0-40 mm

20t/h

Impact-centrifugal

crusher

ДЦ-1,0

The storage hopper

of 20 m3 with the

belt feeder

0-5 mm

20 t/h

Crushed ore 0-0,1 mm

20 t/h is directed for

cyanide procedures

Silo

30 m3

National Cooperative of Artisanal and Industrial Gold Prospectors of South Sudan

The plant for the preparation of reagent solutions

Department for the

preparation of milk of lime Department for the preparation of

sodium cyanide solution

Device to open and empty the

barrels with NaCN

(Andreyev’s apparatus)

Н2О

Н2О

Tank to dissolve sodium

cyanide

Supply tank

10% solution of

cyanide

(NaCN+Н2О)

1 Storage hopper

2 Storage agitation tank

3 Pump

1

2

3

Lime

Milk of lime

(CaO+Н2О)

Sodium cyanide NaCN

W=20-25%

Н2О

Crushed ore

0-0,1 mm; 20 t/h;

Gold concentration: 5 g/t

10% solution of cyanide

(NaCN+Н2О),

Milk of lime (CaO+Н2О)

to produce рН=10-11

Sorbent: activated carbon

(85% - regenerated, 15% - fresh),

It is fed towards the pulp. The averaged

consumption is 70 kg/h (0,11 m3/h)

рН=10-11

Pulp

S:L=1:1,5

37,41 m3/h

Pulp

S:L=1:1,5

37,4 m3/h

Pulp with

sorbent

Pulp to

decontamination

High-speed screen

mesh 0,63 х 0,63 mm

CIL process tanks

The period of procedure: 6 hours

Tanks for preliminary cyanidation

The period of procedure: 2 hours

Время прохождения: 2 часа.

Agitation tank

(pachuka)

Н2О

Н2О

To the tailing dump

3-5% solution

of HCl

Water solution

NaCN – 0,1%

NaOH – 1%

Desorption

(elution) column

60 hours

Column for

washing out the

sludge

10 hours

Column for

washing with HCl (to

remove calcium

carbonate)

10 hours

3-5% solution

of HCl

Regeneration division. It works

once in 4 days.

The capacity of the columns is

12 m3

Resin

0,11 m3/h

+1 spare

column

Vacuum Nutch-

filter

Solution return to

desorption

Electrolyzer

Carbon to

reactivation

70 kg/h

- losses

Eluate

0,11 m3/h

Gold cathode

Dore gold

Induction furnace

T=1200-1250С

Melting time: 1,5-2 h

Electrolytic compartment works once in 4 days.

Furnaces - once in 10-20 days.

Печи раз в 10-20 суток

Resistance furnace

2-3 hours; T=400-500С

Fluxing agents

Calcium oxide: quartz sand: borax =

1:1,6:9,7

thickener

To cyanide procedure

High-speed screen

mesh 0,63 х 0,63

Frame filter

press

Frame filter

press

Carbon reactivation division

No. Auxiliary equipment Quantity,

pcs.

1 The equipment for storing, debagging, preparing and dosing the reagents 1

2 Compressor plant 1

3 Mechanical repair department 1

4 Elevated water tank 1

5 Fuel storage area 2

6 Electric supply station 2

7 Console room with the control system 1

8 Assay laboratory 1

9 Warehouses 9

10 Motor vehicle garage 1

11 The site for decontamination and cleaning 1

Tube-type rotating furnace

with electrical heating

Carbon to

reactivation

70 kg/h

Off-grade carbon (up to

15%)

It is stockpiled.

Fresh carbon

Up to 15%

(10 kg/h)

Before being

directed into the

technological

process carbon is

moistened in the

alkaline solution.

Unbalanced-

throw screen

Sorbent bin

Activated carbon

70 кg/h