Volume 04 Issue 04-2022
11
The American Journal of Applied sciences
(ISSN
–
2689-0992)
VOLUME
04
I
SSUE
04
Pages:
11-19
SJIF
I
MPACT
FACTOR
(2020:
5.
276
)
(2021:
5.
634
)
(2022:
6.
176
)
OCLC
–
1121105553
METADATA
IF
–
7.987
Publisher:
The USA Journals
ABSTRACT
The paper considers the most effective leaching solution for extracting gold; it was decided to test different reagents
using the IW method from spent uranium gold wells. And also Scientific experiments were carried out to extract gold
from a productive solution in laboratory conditions, the sorption process was carried out on various grades of
activated carbon to determine a promising sample. In order to saturate the sorbent with a solution from a productive
solution, studies were carried out with the following types of activated carbons: AG 3, AG 5, AG-95. The sorption
process was carried out with a productive solution supplied from the bottom up and consisting of a pressure column,
with a dense layer of activated carbon 3 kg.
KEYWORDS
Well, gold, productive solution, sorption, desorption, leaching.
INTRODUCTION
The performance of laboratory studies ultimately
makes it possible to obtain geotechnological data that
are used as initial results for conducting a pilot test for
the extraction of gold by in-situ leaching from depleted
uranium wells.
Research Article
RESEARCH TECHNOLOGY OF EXTRACTION OF GOLD FROM A
PRODUCTIVE SOLUTION UNDER LABORATORY CONDITIONS
Submission Date:
April 09, 2022,
Accepted Date:
April 17, 2022,
Published Date:
April 30, 2022 |
Crossref doi:
https://doi.org/10.37547/tajas/Volume04Issue04-03
Sharofjon Babayev
Researcher Of Navoi State Mining Institute, Navoi, Uzbekistan
Shuhrat Alikulov
DSc, Chairman Of Department Of Life Safety Of Navoi State Mining Institute, Navoi, Uzbekistan
Mirdodojon Babayev
Assistant Teacher Of Metallury Department Of Navoi State Mining Institute, Navoi, Uzbekistan
Journal
Website:
https://theamericanjou
rnals.com/index.php/ta
jas
Copyright:
Original
content from this work
may be used under the
terms of the creative
commons
attributes
4.0 licence.
Volume 04 Issue 04-2022
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The American Journal of Applied sciences
(ISSN
–
2689-0992)
VOLUME
04
I
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04
Pages:
11-19
SJIF
I
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FACTOR
(2020:
5.
276
)
(2021:
5.
634
)
(2022:
6.
176
)
OCLC
–
1121105553
METADATA
IF
–
7.987
Publisher:
The USA Journals
Laboratory studies on core material were carried out in
order to determine the permeability of the medium
and the nature of its change in the leaching process,
clarify the geotechnological regime and solve some
special problems associated with the subsequent use
of the results in natural conditions. The research is
based on the method of studying fluid filtration in a
porous medium, known in the practice of laboratory
hydrogeological work.
The technique, with some changes and taking into
account the characteristics of the chemical process,
has found wide application in laboratory studies of
underground leaching of metals from loose sandy
deposits. In the future, the obtained laboratory data
are refined at the semi-industrial site of the deposit
during tests for metal mining.
Numerous variables associated, in particular, with the
heterogeneity of the environment, are stabilized, for
example, the natural mineralogical and filtration
heterogeneity of rocks and ores can be reduced to a
simplified scheme with some average material
composition and specified filtration properties [5].
To determine the mineralogical and material
composition of the core material will be analyzed in the
following methods:
Full chemical analysis of ore, including gold, REE,
scandium and germanium;
Phase and X-ray fluorescence analysis of core
material;
Granulometric analysis of ore by different size
classes;
Conducting campaign experiments;
Chemical analysis of solutions after agitation for
gold and REE.
Before performing analytical work aimed at examining
the core material for gold content, a stage of sample
preparation for subsequent analyzes was carried out.
Sample preparation:
Processing of the core material was carried out in the
following order:
1.
taking the original sample;
2.
measurement of a sample for radioactivity;
3.
sample drying;
4.
sample weighing;
5.
sample mixing;
6.
quartering and sampling for abrasion (100–150
g)
on vibrating grinders type IV.
The crushed samples are sent for X-ray fluorescence,
assay and atomic absorption analysis of gold. Sampling
of technological samples for chemical analysis of REE,
scandium,
germanium,
uranium,
granulometric
composition, mineralogy and agitation[6];
To select the most effective leaching solution for
extracting gold, using the IW method from depleted
uranium wells, based on world experience in gold
leaching, it was decided to test solutions of the
following compositions:
1) I (iodine);
2) H2SO4 + NaClO; (mixture of sulfuric acid and sodium
hypochlorite);
3) NaClO; (sodium hypochlorite);
4) CS(NH2)2 (thiourea);
Volume 04 Issue 04-2022
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The American Journal of Applied sciences
(ISSN
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2689-0992)
VOLUME
04
I
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04
Pages:
11-19
SJIF
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(2020:
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(2021:
5.
634
)
(2022:
6.
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)
OCLC
–
1121105553
METADATA
IF
–
7.987
Publisher:
The USA Journals
Studies on gold leaching in filter columns.
The studies were carried out using a special setup. The
stand consists of a plexiglass filtration column, which is
installed in a vertical position in a metal frame[7].
Fig. 1. Leaching in a filter column, close to the specific conditions of in-situ leaching
Dimensions of the filtration column, diameter 50 mm,
length 1 m. During the experiments, solutions were
tested and pH, Au, U, and REE were analyzed, and the
reagent supply rate was controlled. Sample weight 3,2
kg (Fig. 1).
Liquid samples were taken once a day, it took 3 days
for the leaching process, during the study, the levels of
solutions were controlled to filter the solution at
maximum speed at a constant pressure level j=1,0–2,0.
In the experiments, core samples from the well were
used in the intervals of supra-ore, ore and sub-ore
levels. The leaching was carried out under static
conditions, at room temperature, in a laboratory setup.
After a predetermined time, the solutions were filtered
from the cake and sent for analysis of the gold content
in it[8].
Volume 04 Issue 04-2022
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The American Journal of Applied sciences
(ISSN
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VOLUME
04
I
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04
Pages:
11-19
SJIF
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FACTOR
(2020:
5.
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(2021:
5.
634
)
(2022:
6.
176
)
OCLC
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METADATA
IF
–
7.987
Publisher:
The USA Journals
Table 1.
The results of the analysis of gold leaching from core samples,
obtained from a depleted uranium well
Sample No.
Leaching
Solution
Concentration,
g/l
Name of solvents and quantity
of products
Actual average
values from test
results
Note
I
2
рН=9,00 redox potential= 762
1007
4
Gold concentration, mg/l
178
Surplus test
ε
= 92%
Gold concentration, mg/l
180
Gold concentration, mg/l
184
1026
4
Gold concentration, mg/l
18.1
Ore sample
ε
= 92%
Gold concentration, mg/l
18.2
Gold concentration, mg/l
18.4
1049
4
Gold concentration, mg/l
498
Ore sample
ε
= 92%
Gold concentration, mg/l
505
Gold concentration, mg/l
515
NaClO
рН=3,00 redox sample = 1164,1
1007
4
Gold concentration, mg/l
165
Surplus sample
ε
= 90%
Gold concentration, mg/l
176
Gold concentration, mg/l
180
1026
4
Gold concentration, mg/l
17.1
Ore sample
ε
= 90%
Gold concentration, mg/l
17.7
Gold concentration, mg/l
18
1049
4
Gold concentration, mg/l
495
Ore sample
ε
= 90%
Gold concentration, mg/l
505
Gold concentration, mg/l
515
NaClO+ acidic solution Н
2
SO
4(к)
рН=3,00 redox potential = 1150,8.
1007
4
Gold concentration, mg/l
178
Surplus sample
ε
= 96%
Gold concentration, mg/l
186
Gold concentration, mg/l
192
1026
4
Gold concentration, mg/l
18.1
Ore samlpe
ε
= 96%
Gold concentration, mg/l
18.6
Gold concentration, mg/l
19.2
Volume 04 Issue 04-2022
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VOLUME
04
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Pages:
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SJIF
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(2020:
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(2021:
5.
634
)
(2022:
6.
176
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OCLC
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METADATA
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–
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Publisher:
The USA Journals
1049
4
Gold concentration, mg/l
518
Ore sample
ε
= 96%
Gold concentration, mg/l
525
Gold concentration, mg/l
537
2CS (NH
2
)
2
рН=3,5 redox sample = 500 мВ.
1007
4
Gold concentration, mg/l
176
Surplus sample
ε
= 97%
Gold concentration, mg/l
188
Gold concentration, mg/l
194
1026
4
Gold concentration, mg/l
18,1
Ore sample
ε
= 97%
Gold concentration, mg/l
18,7
Gold concentration, mg/l
19,4
1049
4
Gold concentration, mg/l
527
Ore sample
ε
= 97%
Gold concentration, mg/l
538
Gold concentration, mg/l
543
The results in Table 1 and Fig. 2, Fig. 3., Fig. 4 indicate
that gold dissolves in all tested solvents. The most
pronounced results are shown by the solution in the
well of the under-ore interval, in thiourea
concentrations of 4 g/l. This is due to the fact that the
core samples were acidified[9]. Additionally, it can be
stated that the use of sodium hypochlorite together
with sulfuric acid and the thiourea reagent showed the
highest result of gold extraction, which amounted to
537 mg/l and 543 mg/l.
Volume 04 Issue 04-2022
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VOLUME
04
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Pages:
11-19
SJIF
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FACTOR
(2020:
5.
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)
(2021:
5.
634
)
(2022:
6.
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)
OCLC
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METADATA
IF
–
7.987
Publisher:
The USA Journals
Fig. 2 Dependence of gold recovery from overore core samples by various reagents and time
Fig. 3. Dependence of gold extraction from ore core samples by various reagents and time
178
180
184
165
176
180
178
186
192
176
188
194
150
155
160
165
170
175
180
185
190
195
200
144
148
150
Leaching duration, hours
Au
con
te
nt
mg
/l
I2 рН=9,00
NaClO рН=3,00
NaClO+ acidic solution
pH=3,00
2CS (NH2)2 рН=3,5
18.1
18.2
18.4
17.1
17.7
18
18.1
18.6
19.2
18.1
18.7
19.4
15.5
16
16.5
17
17.5
18
18.5
19
19.5
20
144
148
150
Leaching duration, hours
Au
con
te
nt
,
mg
/l
I2 рН=9,00
NaClO рН=3,00
NaClO+ acidic
solution
2CS (NH2)2
рН=3,5
Volume 04 Issue 04-2022
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The American Journal of Applied sciences
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VOLUME
04
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Pages:
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SJIF
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FACTOR
(2020:
5.
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(2021:
5.
634
)
(2022:
6.
176
)
OCLC
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1121105553
METADATA
IF
–
7.987
Publisher:
The USA Journals
Fig. 4. Dependence of gold extraction from underore core samples by various reagents and time
Scientific experiments were carried out to extract gold
from a productive solution in laboratory conditions,
the sorption process was carried out on various grades
of activated carbon to determine a promising sample.
In order to saturate the sorbent with a solution from a
productive solution, studies were carried out with the
following types of activated carbons: AG-3, AG-5, AG-
95. The sorption process was carried out with a
productive solution supplied from the bottom up and
consisting of a pressure column, with a dense layer of
activated carbon 3 kg.
The processing time was 20 hours in the sorption
column, the volume was 6 liters of the processed
solution.The volume of processed solutions to the
volume of the sorbent is shown in Fig.5. The results of
the processing of solutions are presented, the amount
of gold in coal was 515 mg/kg. The extraction of gold
from solutions was 95%. [eight; pp.235-2478]. Table 2
shows the results of a study of 3 types of activated
carbons in terms of sorption properties for gold.
498
505
515
495
505
515
518
528
537
527
538
543
470
480
490
500
510
520
530
540
550
144
148
150
Leaching duration, hours
Au
con
te
nt
,
m
g/
l
I2 рН=9,00
NaClO рН=3,00
NaClO+ acidic solution
pH=3,00
2CS (NH2)2 рН=3,5
Volume 04 Issue 04-2022
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VOLUME
04
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Pages:
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(2020:
5.
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(2021:
5.
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(2022:
6.
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METADATA
IF
–
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Publisher:
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Table 2.
The results of studies on the sorption of gold from a productive solution using activated carbons of various
grades
Measured parameter
Measure
Types of activated carbon
АG-3
АG-95
АG-5
Sorption time
ч
20
20
20
Volume of solutions
л
6
6
6
Average gold content in the productive
solution
мг/л
543
543
543
The content of gold in the sorbent at the time
of stopping the adsorber (3 kg)
г/кг
0,515
0,368
0,501
According to Table. 2 for the extraction of gold from the productive solution, the most promising sorbent is
activated carbon grade AG-3
.
Fig. 5. Comparative analysis of the gold content in various types of activated carbon
Under laboratory conditions, studies were carried out
on the sorption of gold from a productive solution
using activated carbon grades AG-3, AG-95 and AG-5.
The research results showed that the best extraction
0
0.1
0.2
0.3
0.4
0.5
0.6
аг-95
аг-5
аг-3
Au
co
n
ten
t,
g
/kg
Brands of activated carbons
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VOLUME
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Pages:
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(2020:
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(2022:
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Publisher:
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of gold (515 mg/kg) is achieved with a sorption duration
of 20 h, while the degree of extraction of gold from the
solution is 96%.
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