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STUDY OF THE SEPARATION PROCESS OF THE DOLOMITE SOIL FORMED
DURING THE DISSOLVING OF DOLOMITE WITH SULFURIC ACID INTO LIQUID
AND SOLID PHASES
Mixliyev Oybek Avloyorovich
Karshi State Technical University
Shamayev Baxodir Ergashevich
Termez State University of Engineering and Agrotechnology
Xushvaqtov Elnur Iskandar ugli
Karshi State Technical University
Abstract:
The foam height and foam density formed during the decomposition of local
dolomite raw materials in the presence of sulfuric acid under optimal conditions were
determined, and methods and optimal conditions for reducing foam density were studied using
“PAA-gel” and “Structol SB-2195” as antifoaming reagents.
Keywords:
Foam density, PAA – gel, Structol SB-2195, blue ribbon-TU, SFM.
In order to accelerate the process of sulfuric acid decomposition of local dolomite raw materials
and establish optimal conditions and technological parameters for its processing into liquid and
crystalline MgSO
4
, (NH
4
)
2
Mg(SO
4
)
2
, (NH
4
)
2
Mg(SO
4
)
2
·6H
2
O and liquid and granular nitrogen
calcium and magnesium fertilizers, as well as to carry out scientific research in laboratory
conditions, dolomite raw materials were imported from Dehqanabad district, Kashkadarya
region. The filtration rate of the sour slurry obtained from the decomposition of the selected
dolomite sample with sulfuric acid with a concentration of 20 to 40%, standard 110%, was
determined by slurry, liquid and solid phases, and the results obtained are presented in this table
[1].
The effects of surfactants (PAA - gel and Structol SB-2195) and acid concentrations on the
filtration rate of the slurry formed by the processing of dolomite raw materials with sulfuric
acid at acid concentrations of 20, 30 and 40%, standard 110%, solid:liquid phase ratios of 1:3.5,
1:2.8, 1:2.3, 1:2.0 and 1:1.8 and a temperature of 50 °C were determined. Technological
parameters for the filtration of sour slurry obtained from the processing of dolomite with
sulfuric acid, at a temperature of 50 °C and a pressure of 0.06 MPa or 450 mm.cm.st., the
effects of 10, 20 and 30 g/ton of PAA - gel and Struktol SB-2195 surfactants on the filtration
process on filter paper of the blue ribbon-TU 2642-001-05015242-07 brand were determined.
In this case, it was determined that the filtration rate of the slurry obtained by disintegrating the
dolomite raw material with sulfuric acid with a concentration of 20% was 2025.50 kg/m2·s for
the slurry without surfactants, 1418.30 kg/m2·s for the filtrate (sour liquid phase), 607.20
kg/m2·s for the solid phase and 162.80 kg/m²·s for the sum of the amounts of CaO+MgO.
When we added PAA-gel and Structol SB-2195 surfactants in the amount of 10-30 g/t to the
process of dolomite decomposition in 20% H
2
SO
4
(10 SFM added to 1 ton of dolomite raw
material), the filtration rate of the slurry increased from 3066.40 to 3355.40 kg/m³·s and
3152.50 to 3194.00 kg/m²·s for the slurry, from 2330.55 to 2550.20 kg/m²·s and 2404.80 to
2434.90 kg/m²·s for the filtrate (sour liquid phase), from 735.85 to 805.20 kg/m²·s and 747.70
to 797.35 kg/m²·s for the solid phase. and the sum of CaO+MgO increased from 246.65 to
269.70 kg/m²·s and from 253.40 to 256.70 kg/m²·s, respectively. The filtration rate of the slurry,
which was decomposed with 30% sulfuric acid, was 2184.00 kg/m2·s for the slurry without
INTERNATIONAL MULTIDISCIPLINARY JOURNAL FOR
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surfactants, 1386.65 kg/m²·s for the filtrate (sour liquid phase), 797.35 kg/m²·s for the solid
phase, and 222.20 kg/m²·s for the sum of CaO+MgO.
Table 1.
The effect of surfactants on the filtration rate of slurry obtained from the decomposition of
dolomite with sulfuric acid (N=110%; t=50 °С and τ=40 min)
Const.
H
2
SO
4
%
Surfactant,
gr/ton
Porridge filtration rate, kg/m
2
·s
(0,06 MPа)
Bo‘tqa
bo‘yicha
Fil‘trat
(nordon
suyuq
faza)
bo‘yicha
Qattiq faza
bo‘yicha
CaO+MgO
bo‘yicha
20
0
2025,50
1418,30
607,20
162,80
PAA-gel
10
3066,40
2330,55
735,85
246,50
20
3210,90
2440,38
770,52
258,10
30
3355,40
2550,20
805,20
269,70
“Struktol SB 2195”
10
3152,50
2404,80
747,70
253,40
20
3173,25
2419,85
753,40
255,05
30
3194,00
2434,90
759,10
256,70
30
0
2184,00
1386,65
797,35
222,20
PAA-gel
10
2712,00
1672,17
1039,83
276,89
20
3229,30
1917,72
1311,58
332,71
30
3746,60
2163,27
1583,33
388,52
“Struktol SB 2195”
10
2861,96
1806,83
1055,13
292,15
20
2936,11
1844,34
1091,77
299,75
30
3010,25
1881,84
1128,41
307,34
40
0
2342,50
1355,00
987,50
327,95
PAA-gel
10
2357,60
1013,80
1343,80
330,06
20
3328,40
1452,73
1875,67
465,97
30
4299,20
1891,65
2407,55
601,88
“Struktol SB 2195”
10
2571,43
1208,87
1362,56
360,00
20
2698,97
1268,83
1430,14
377,85
30
2826,51
1328,78
1497,73
395,70
When we added PAA-gel and Structol SB-2195 surfactants in the process of dolomite
decomposition at 30% H
2
SO
4
in an amount of 10 - 30 g/t (10 SFM added to 1 ton of dolomite
raw material), the filtration rate of the slurry increased from 2712.00 to 3746.60 kg/m³·s and
2861.96 to 3010.25 kg/m²·s for the slurry, from 1672.17 to 2163.27 kg/m²·s and 1806.83 to
1881.84 kg/m²·s for the filtrate (sour liquid phase), from 1039.83 to 1583.33 kg/m²·s and
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1055/13 to 1128.41 kg/m²·s for the solid phase. It was also found that the sum of the
CaO+MgO amounts increased from 276.89 to 388.52 kg/m²·s and from 292.15 to 307.34
kg/m²·s, and the filtration rate of the slurry, which was crushed with 40% sulfuric acid
concentration of dolomite raw material, was 2342.50 kg/m²·s for the slurry without surfactants,
1355.00 kg/m²·s for the filtrate (sour liquid phase), 987.50 kg/m²·s for the solid phase, and
327.95 kg/m²·s for the sum of the CaO+MgO amounts. When we added PAA ‒ gel and
Structol SB-2195 surfactants in the process of dolomite decomposition in 40% H
2
SO
4
in an
amount of 10 - 30 g/t (10 SFM added to 1 ton of dolomite raw material), the filtration rate of
the slurry increased from 2357.60 to 4299.20 kg/m³·s and 2571.43 to 2826.51 kg/m²·s for the
slurry, from 1013.80 to 1891.65 kg/m²·s and 1208.87 to 1328.78 kg/m²·s for the filtrate (sour
liquid phase), from 1343.80 to 2407.55 kg/m²·s and 1362.56 to 1497.73 kg/m²·s for the solid
phase. and the sum of CaO+MgO amounts increased from 330.06 to 601.88 kg/m²·s and from
360.00 to 395.70 kg/m²·s. The experimental analyses conducted in the experimental model
device under laboratory conditions and the results obtained are presented in the table [2.3].
Thus, it was found that when decomposing the Dehqanabad mine dolomite raw material with
20% H
2
SO
4
, the filtration rate increased by 1.51 - 1.66 times and 1.55 - 1.58 times in slurry
compared to 10-30 g/ton of surfactants "PAA-gel" and "Structol SB 2195", while at 30% H
2
SO
4
,
the filtration rate increased by 1.24 - 1.72 times and 1.31 - 1.38 times in slurry. It was found
that the filtration rate increased by 1.01 - 1.83 times for porridge and 1.10 - 1.21 times for 40%
H
2
SO
4
.
References
1. O.A.Mixliyev.,X.Ch.Mirzaqulov.,R.Ch.Yorboboyev.,Sh.M.Olmurova.. The study of
rheological properties of dolomite raw materials during the processing of sulfuric acid into
magnesium sulfate and gypsum. Innovative developments and Research in education
International scientific-online conference. Part 28.April 23rd. Colletions Of Scientific Works.
Canada 2024 yil. с. 470-472.
2. O.A.Mixliyev., X.Ch.Mirzaqulov., R.Ch.Yorboboyev. Investigation of the foaming process
during decomposition of local dolomite gaiters and in sulfuric acid. Ethiopian in international
journal of multidisciplinary research. May. Hindiston-2024 yil. - c. 610-611.
3.
O.A.Mixliyev., X.Ch.Mirzaqulov.,
R.Ch.Yorboboyev. Dehqonobod koni dolomit
xomashyosi nitrat va sulfat kislota. bilan parchalanish jarayonida ko‘piklanish jarayonini
o‘rganish. Ilm fan xabarnomasi. Ilmiy elektron jurnal. 2-tom. Andijon-2024-yil. - с.462-464.
