Volume 02 Issue 10-2022
4
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
10
Pages:
04-10
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
ABSTRACT
The article deals with the issues of hydrometallurgical processing of beneficiation products, the reasons for the loss
of valuable components and the problems of rational use of natural mineral resources. The process, technological
schemes, technological parameters and standard conditions for cyanidation of enrichment products are analyzed.
KEYWORDS
Hydrometallurgy, cyanidation, industrial waste, sorption, gravity concentrate, flotation, pulp, alkali, filtration, sodium
cyanide, ion-exchange resin.
Research Article
HYDROMETALLURGICAL PROCESSING OF ENRICHMENT PRODUCTS
Submission Date:
October 01, 2022,
Accepted Date:
October 05, 2022,
Published Date:
October 09, 2022
Crossref doi:
https://doi.org/10.37547/ajast/Volume02Issue10-02
Khamidullaev B.N
University Of Geological Sciences State Institution "Institute Of Mineral Resources, Uzbekistan
Khasanov A.S
Almalyk Mining And Metallurgical Combine JSC, Uzbekistan
Kamolov T.O
SUE "Fan Va Tarakkiyot » Tashkent State Technical University, Uzbekistan
Raupova D.N
SUE "Fan Va Tarakkiyot » Tashkent State Technical University, Uzbekistan
Bekmuratov B.T.
Almalyk Mining And Metallurgical Combine JSC, Uzbekistan
Journal
Website:
https://theusajournals.
com/index.php/ajast
Copyright:
Original
content from this work
may be used under the
terms of the creative
commons
attributes
4.0 licence.
Volume 02 Issue 10-2022
5
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
10
Pages:
04-10
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
INTRODUCTION
Worldwide recent years, the mining industry, the level
of extraction of wolframite has decreased significantly.
Many of them are worked out by artisanal methods,
seasonally; stocks of ores (especially rich and easily
enriched) are running out, and large concentrating
enterprises have either been stopped or are not
operating at full capacity. In this regard, the issues of
using enrichment wastes have both economic and
environmental aspects [1] .
In addition, due to the departmental affiliation of
mining and processing enterprises, complex raw
materials were processed only taking into account the
necessary needs of the industry for a particular metal,
which led to the irrational use of natural mineral
resources and an increase in the cost of waste storage.
Currently, more than 12 billion tons of waste have been
accumulated, the content of valuable components in
which in some cases exceeds their content in natural
deposits [2] .
In the field of using ore-dressing wastes, the main thing
is the technological and physical-mechanical study of
each specific technogenic deposit. In turn, the results
of the study will allow the development of an
environmentally friendly and efficient technology for
the development of an additional source of mineral
raw materials [2] .
Results of the research and discussion. Experiments on
cyanidation were carried out on enrichment products.
Cyanidation by pulp mixing was carried out on a bottle
agitator designed by IRGIREDMET. The experiments
were carried out according to the standard method: a
sample of material 100-200 g was mixed with a cyanide
solution with the addition of a protective alkali. The
concentration of sodium cyanide in the solution was
determined in the presence of two indicators: Feigl's
reagent and potassium iodide. The latter was supplied
if subsequent determination of the protective alkali
concentration in the same solutions was necessary.
The pulp was reinforced by the concentration of
cyanide and lime as they were consumed. In the
starting material and cyanidation cakes , the content of
noble metals was determined chemically using a
Perkin-Elmer atomic absorption spectrometer .
Cyanidation of enrichment products. Products of
gravitational and flotation enrichment of tailings of
recleaning of gravity concentrate were subjected to
cyanidation . Experiments were carried out, both direct
and sorption cyanidation in the presence of AM-2B ion-
exchange resin. The resin consumption in the
experiments was 3% of the pulp volume.
The experiments were carried out according to the schemes of Fig. 1 and 2 .
Volume 02 Issue 10-2022
6
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
10
Pages:
04-10
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
Raw material
CaO
sodium cyanide
CYANIZING
FILTERING AND WASHING
Filtrate Cyanidation
Cake
(gold solution)
for chemical analysis
for chemical analysis
Fig.1.
Scheme of experiments on cyanidation of enrichment products
Raw material
CaO
Sodium cyanide
PRE-CYANISHING
Resin AM-2B
SORPTION CYANIZATION
Volume 02 Issue 10-2022
7
American Journal Of Applied Science And Technology
(ISSN
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2771-2745)
VOLUME
02
I
SSUE
10
Pages:
04-10
SJIF
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FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
SCREENING, WASHING
Pulp
Resin
FILTRATION, WASHING
for chemical analysis
Cake
Solution
NEUTRALIZATION
for chemical analysis
for chemical analysis
Fig. 2. Scheme of experiments on sorption cyanidation of enrichment products
In the experiments, the grinding size of the products
varied, which amounted to -0.315 mm (initial size) and
90% of the -0.074 mm class. The concentration of
sodium cyanide in the experiments was 0.06-0.2%. Also,
for some products, intensive cyanidation was tested at
a cyanide concentration of 0.6%.
The constant parameters were taken as follows:
sample - 100-150 g, L:S = 2:1 and the concentration of
protective alkali - 0.02%, the duration of the
experiments - 24 hours.
At the end of the cyanidation process, the pulp was
filtered, the cake was washed. After neutralization and
filtration, the cake was dried.
In order to additionally open gold associated with
sulfides with the oxidation of the latter and create
favorable conditions for cyanidation and transfer of
precious metals into a cyanide solution, experiments
were carried out on oxidative roasting of sulfide
flotation concentrate .
Oxidative firing was carried out in a laboratory muffle
furnace at a temperature of 500-650°C for 2 hours. In
order to activate the gold surface from the deposits
formed during firing, the cinder was treated with a 3%
solution of sulfuric acid at a temperature of 85-90°C, L:S
= 5:1 and the duration of the process is 1 hour.
In table. Figures 1 and 2 show the results of
experiments on cyanidation of enrichment products,
Volume 02 Issue 10-2022
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American Journal Of Applied Science And Technology
(ISSN
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2771-2745)
VOLUME
02
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10
Pages:
04-10
SJIF
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FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
respectively, at their initial fineness and with
regrinding.
Table 1
The results of cyanidation of enrichment products at their initial fineness
Name
products
Gold content, g/t
Extraction of gold
into solution/resin
, %
Experience conditions
C
NaCN
, %
Resin loading in
% of pulp
volume
Table concentrate
69.15
Cyanidation tailings
7.48
89.18
0.2
-
Tails of gravity
3.1
Cyanidation tailings
1.0
67.74
0.15
-
Sulfide concentrate
73.6
Cyanidation tailings
7.82
89.38
0.2
-
Cyanidation tailings
6.51
91.15
0.6
-
Cyanidation tailings
6.1
91.71
0.6
3
Finishing tails
4.26
Cyanidation tailings
2.6
38.97
0.06
-
Cinder of sulfide concentrate
105.1
Cyanidation tailings
6.4
93.91
0.2
-
Sulfuric acid treatment cake of sulfide
concentrate cinder
116.7
Cyanidation tailings
6.25
94.64
0.2
-
As can be seen from Table.1, the obtained gravity
concentrate and sulfide concentrates, with their initial
size, are cyanidated with high technological
performance. During cyanidation of the table
concentrate, 89.18% of gold is extracted into the
solution. With intensive cyanidation of the sulfide
Volume 02 Issue 10-2022
9
American Journal Of Applied Science And Technology
(ISSN
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2771-2745)
VOLUME
02
I
SSUE
10
Pages:
04-10
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
flotation concentrate (CNaCN - 0.6%), 91.15% of gold is
extracted into the solution, and 91.71% of gold is
extracted on the resin in the sorption process. During
cyanidation of the cinder of the flotation concentrate ,
the extraction of gold increases to 93.91%. During
cyanidation of the cyanide of the sulfuric acid
treatment of the cinder of the sulfide concentrate, the
extraction of gold into the solution was 94.64%.
Table 2
Results of cyanidation of enrichment products with regrinding
Name
products
Gold content,
g per
tons
Extraction of gold
into solution/resin
,
%
Experience conditions
C
NaCN
,
%
Resin loading in
% of pulp
volume
Table concentrate
69.15
Cyanidation tailings
4.95
92.84
0.2
-
Tails of gravity
3.1
Cyanidation tailings
0.86
72.26
0.15
-
Sulfide concentrate
73.6
Cyanidation tailings
5.76
92.17
0.2
-
Cyanidation tailings
3.95
94.63
0.6
-
Cyanidation tailings
3.62
95.08
0.6
3
Finishing tails
4.26
Cyanidation tailings
1.9
55.4
0.06
-
Cinder of sulfide concentrate
105.1
Cyanidation tailings
4.45
95.77
0.2
-
Sulfuric acid treatment cake of sulfide
concentrate cinder
116.7
Cyanidation tailings
4.35
96.27
0.2
-
Volume 02 Issue 10-2022
10
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
10
Pages:
04-10
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
As can be seen from Table 2, the use of the operation
of regrinding the enrichment products before
cyanidation predetermined the receipt of a high gold
recovery in comparison with the results of cyanidation
of the enrichment products at their original size.
CONCLUSION
During cyanidation of the table concentrate, 92.84% of
gold is extracted into the solution. With intensive
cyanidation of the sulfide flotation concentrate
(CNaCN - 0.6%), 94.63% of gold is extracted into the
solution, and 95.08% of gold is extracted on the resin in
the sorption process. During cyanidation of the cinder
of the flotation concentrate , the extraction of gold
increases to 95.77%. In cyanidation of the cyanide of the
sulfuric acid treatment of the cinder of the sulfide
concentrate, the extraction of gold into the solution
was 96.27%.
REFERENCES
1.
Streltsova A. A., Sokolova A. D., Frolova I. V.
Technological features before the extraction
of tungsten from enrichment tailings / /
Chemistry and chemical technology in the XXI
century: materials of the XVII International
Scientific and Practical Conference of Students
and Young Scientists named after Professor
L.P. Kuleva : in 2 volumes, Tomsk, May 17-20,
2016. - Tomsk: TPU, 2016 - Vol. 1 - pp93-95.
2.
Khamidullaev
B.N.,
Akhmedov
Kh.,
Nurmukhamedov I.S., Khabibullaeva G.R.
Development of a technological scheme for
the enrichment of samples of gold-bearing ore
in the Mezhdurechye area of the Kyzylalma
deposit . Materials International Scientific and
Technical. conf . "Integration of science and
practice as a mechanism for the effective
development of the geological industry of the
Republic of Uzbekistan" 2016. Part 2. -pp138-
140.
3.
Tolibov B.I., Khasanov A.S., Pirmatov E.A.
Factors influencing technological indicators in
the production of molybdenum // Universum:
technical sciences: electronic scientific journal,
2021. 10(91),
–
P39-42
