Uktam Temirov
@info@ndki.uz
Navoi State University of Mining and Technologies
RESEARCH, TEACHING, or OTHER INTERESTS
Chemical Engineering, Ecology, Evolution, Behavior and Systematics, Agricultural and Biological Sciences, Biochemistry, Genetics and Molecular Biology
Scopus Publications
Scopus Publications
Jamshid Kholmurodov, Uktam Temirov, Shafoat Namazov, and Ruzmat Radjabov
EDP Sciences
Studying the conversion of local natural gypsum and phosphogypsum, categorized as a byproduct of extracting phosphoric acid (EPA), into ammonium carbonate through a liquid-based method. At the same time, the concentration of ammonium carbonate in an aqueous solution was obtained in the range from 10 to 50%. The norms of ammonium carbonate were 100, 105, 110% relative to stoichiometry. The transfer time of ammonium carbonate to the reaction zone was from 5 to 30 minutes, and the conversion time was also studied in the range from 5 to 30 minutes. The conversion process was carried out at a temperature of 30 to 50°C. The optimal time for the carbonate conversion of gypsum was 30 minutes, and the conversion rate was 95.68 and 96.83%.
Farhod Ibatov, Abdurasul Mamataliev, Shafoat Namazov, and Uktam Temirov
EDP Sciences
The chemical industry of Uzbekistan has all the prerequisites for creating the production of complex (nitrogen-phosphorus, nitrogen-phosphorus-potassium, nitrogen-phosphorus-sulfur-containing and others) fertilizers based on ammonium nitrate (AN). Phosphogypsum (PG), a waste product from the production of extraction phosphoric acid (EPA), can serve as an additive to AN. About 80 million tons of PG have been accumulated on the territory of Ammofos-Maxam JSC alone. There is no acceptable technology for its disposal yet. And as a phosphate additive – phosphate rock (PR) of Kyzylkum. The production of granular complex fertilizers by direct mixing of AN melt with PR followed by the addition of PG is the most promising from the point of view of low cost and manufacturability, it is also environmentally friendly. In this case, PR phosphorus transforms into a form that is assimilated by plants. And PG in the AN melt undergoes conversion with the formation of soluble ammonium sulfate. When obtaining samples of NPS fertilizers, the mass ratio of AN:PR varied from 100:3 to 100:50. And the PG additive was taken in amounts of 5, 10 and 15% of the total mass of the mixture of AN and PR. To granulate the nitrate-phosphate-gypsum melt, the pelletizing method was used. It has been shown that melted nitrate activates PR, that is, it converts the P2O5 form that is indigestible in it into a form that is digestible for plants. In this case, PG undergoes conversion with the formation of ammonium sulfate. The addition of both FM and PG to AN significantly increases the strength of the latter's granules. If for pure AN it is equal to 1.32 MPa, then for a fertilizer with a mass ratio of AN:PR = 100:20 with the addition of 5% PG this figure is already 8.54 MPa.
Khurshida Urunova, Durdona Azimova, Farhod Umirov, Najimuddin Usanbayev, Jamshid Kholmurodov, and Uktam Temirov
EDP Sciences
In this article, we conducted research on the production of calcium and magnesium phosphates based on dolomite and phosphoric acid. The purpose of adding different concentrations of phosphoric acid to dolomite is to determine the optimal concentration. Then samples were taken by adding phosphoric acid of the appropriate concentration to the dolomite in various mass ratios. The total and soluble forms of calcium oxide, magnesium oxide, phosphorus pentoxide contained in the obtained samples, as well as the levels of decarbonization, were studied. Research results have shown that the total forms of calcium oxide, magnesium oxide and phosphorus pentoxides in dolomite decrease after acid concentrations from 5% to 25%.
Sayfutdin Buriyev, Shafoat Namazov, Abdurasul Mamataliyev, Muhriddin Qo‘chqorov, Jamoliddin Kushokov, Zhurabek Shodikulov, and Uktam Temirov
EDP Sciences
During the preparation of samples containing non-caking AN combined with serpentinite (SP), the mass ratio of AN to SP ranged from 100 : 0.5 to 100 : 2.5. The prilling method was employed to granulate the melt of serpentinite-nitrate. It has been demonstrated that the AN melt activates SP, facilitating the conversion of MgO from an indigestible form to a form that is readily absorbable by plants. In this scenario, serpentinite undergoes conversion, resulting in the formation of magnesium nitrate. The primary criterion for assessing the non-caking AN is the strength of the granules. If the strength of the granules for pure AN is measured at 1.32 MPa, then for fertilizers with the AN : SP ratio of 100: 0.5 and 100: 2.5, the corresponding strengths are 3.74 and 4.72, respectively. Based on the DTA studies carried out, we can conclude the following: an increase in the temperature of the modification transition IV→III and the reverse transition II→IV leads to the preservation of high strength and a decrease in the caking of AN granules during transportation and storage.
Umid Rustamov, Mansur Kholmurotov, Javlon Jurayev, Ilhom Tagayev, Najimuddin Usanbayev, and Uktam Temirov
EDP Sciences
The article delves into the application of IR-spectroscopic, chemical, and X-ray diffractometric methods to assess the mineralogical composition and salinity levels of soil samples collected from Navoi city and Navbakhor district, specifically the settlement of Shurkishlak. Through these studies, the researchers were able to discern the salinity characteristics of the region's old-irrigated soils.Findings indicate a predominance of carbonate salinity in Navoi city, while the Navbakhor district exhibits a notable prevalence of sulfate salinity, surpassing carbonate levels. Additionally, a third salinity type, characterized by chloride, is identified. Importantly, all observed soil minerals demonstrate varying degrees of water solubility, presenting in ionic form within aqueous soil extracts.These insights shed light on the soil composition and salinity dynamics of the studied regions, providing valuable information for agricultural planning and soil management strategies. Understanding the mineralogical composition and salinity profiles of soils is crucial for optimizing agricultural practices and ensuring sustainable land use in Navoi city and Navbakhor district.
Azam Rasulov, Bakhtiyor Juraev, Sadokat Toshtemirova, Shafoat Namazov, and Uktam Temirov
EDP Sciences
The process of obtaining ammophosphate by means of phosphoric acid decomposition of washed dried concentrate (WDC with 26% P2O5 and 10% CO2) - raw material for the production of thermally fired concentrate, has been studied. The wet process phosphoric acid (WPA) contains (wt.%): 16.46 P2O5, 0.06 CaO, 1.11 MgO, 0.27 Fe2O3, 0.41 Al2O3, 2.98 SO3 and 0.99 F. The weight ratio of WPA:WDC ranged from 100: 10 to 100: 30. Then acidic phosphate pulps (at 65 °C) after 45 minutes were ammoniated to pH = 3.8, granulated and dried at 85-90 °C. It has been shown that the nitrogen content in the finished product ranges from 4.92-7.11%, total phosphorus (P2O5t.) 41.48-46.44%, phosphorus acceptable by citric acid (P2O5ac.c.a.) 34.79-45.11%, phosphorus form of water soluble (P2O5w.s.) 23.49-37.73%. Weight fractions of H2SO4 - 5 and 7.5 were optimal and the product contains 37.6 and 34.47% of P2O5t.; 24.11 and 22.06% CaOt., 88.75 and 92.40% P2O5ac.c.a.by citric acid: P2O5t., 84.21 and 89.7% P2O5ac.tr.b. by trilon B: P2O5t., 77.39 and 79.54% P2O5w.s.:P2O5t., 6.03 and 7.08% nitrogen, respectively. The strength of granules of fertilizers averages 3.50 MPa and are quite suitable for bulk storage and transportation.
Khayrullo Kanoatov, Shafoat Namazov, Uktam Temirov, Najimuddin Usanboyev, and Tuychi Pirimov
EDP Sciences
This article presents the results of studies on the production of bioorganic mineral fertilizers by treating a mixture based on black manure and phosphorite raw materials with a solution that accelerates the humification of organic matter, binds molecular nitrogen and enriches it with physiologically active substances, as well as microorganisms that play an important role in soil fertility. Based on the results of the study, it was found that treatment of a mixture based on black manure and phosphorite raw materials with a solution containing beneficial microorganisms accelerates the humification of organic matter, increases the conversion of phosphorus and reduces the release of nitrogen and organic matter into the gas phase.
Maftuna Akhtamova, Uktam Temirov, Navruzbek Khurramov, Azim Shukurov, and Bekhzod Karshiev
EDP Sciences
In this article, scientific research on the production of thermophosphate fertilizers was carried out on the basis of thermo-alkaline activation of Central Kyzylkum waste phosphorite with mineralized mass and alkali metal salts, namely NaCl, KCl, Na2SO4, K2SO4, Na2CO3, K2CO3 and silica at high temperature. In this case, samples are heated in muffle furnaces at temperatures of 800°C, 900°C, 1100°C, 1200°C and for 30 min, 60 min, 120 min. The total P2O5, assimilable P2O5, total СaO and total СO2 forms of the sintered tablets were investigated. As it can be seen from the experiments conducted with mineralized mass phosphorite, alkaline salts and quartz sand, it was found that the assimilated form of СaO, P2O5 and the degree of decarbonation rose with increasing temperature and time.
Ilhom Tagayev, Shohrux Juraev, Muxabbat Маsharipova, Sanobar Achilova, and Uktam Temirov
EDP Sciences
This article deals with the issues of determining the mineralogical composition of soil samples in the city of Navoi and the Karmaninsky district (the settlement of Khazora, 24 km from the city) and identifying the degree of salinization of these old irrigated soils in the region. To determine the mineralogical composition of soil soils, the X-ray diffraction method of research was used, and to determine the functional groups of carbon, sulfur, and chlorine, IR spectrometric analysis of samples was used. The studies carried out made it possible to establish a carbonate type of salinity for the city of Navoi, and for the Karmaninsky district, the dominance was noted first of carbonate - 45.4%, then sulfate 28.8%, and only lastly did the third type of salinity appear, represented by chloride - 0.8%, found on the surface layer of the soil (0-0, mm).
Tuychi Pirimov, Shafoat Namazov, Atanazar Seytnazarov, Uktam Temirov, and Najmiddin Usanboyev
EDP Sciences
The article presents the results of a study of the processes of obtaining magnesium oxide by fusing serpentinites of the Arvaten deposit in the presence of ammonium sulfate, followed by grinding and treatment with water to separate silica from the suspension, neutralizing the filtrate with ammonia to pH 8.5 for precipitation and separation of impurity metal ions, precipitation and separation of ions magnesium from solution using ammonia and ammonium carbonate, thermal decomposition of magnesium corbanate to obtain magnesium oxide. It has been established that the use of ammonium sulfate for fusion of serpentite at a ratio of serpentenite: (NH4)2SO4 = 100: 201.77 and further processing of the resulting solutions allows you to obtain magnesium oxide with a composition (wt.%): MgO - 97.55; Fe2O3 - 0.86; A12O3 - 0.12; CaO - 0.18; SO3 - 0.48.
Pirnazar Ganiev, Shafoat Namazov, Najimuddin Usanbaev, Uktam Temirov, and Bakhtiyor Numonov
EDP Sciences
This article presents the results of the physical and chemical properties of humic simple superphosphate obtained by decomposition of the ordinary phosphorous flour of the Central Kyzylkum with sulfuric acid and the addition of oxidized coal from the Angren deposit with hydrogen peroxide. The distinctive characteristics of humic simple superphosphate are shown in comparison with simple superphosphate obtained without the addition of oxidized coal.
Farhod Umirov, Khurshida Urunova, and Uktam Temirov
EDP Sciences
In this article, the HMP-3 wastewater treatment process with natural minerals (vermiculite, zeolite, dolomite, saponite, shungite, bentonite, basalt minerals), rice husk, 1% NaClO (sodium hypochlorite) and 3% H2O2 (hydrogen peroxide) solutions will be discussed. According to the research results, the activation of samples used for wastewater treatment in the form of 1% sodium hypochlorite solution and 3% hydrogen peroxide solution shows high efficiency.
Bakhron Boynazarov, Tolib Berdiyev, Uktam Temirov, Pirnazar Ganiev, and Najimuddin Usanbaev
EDP Sciences
In this paper, scientific research has been conducted on the production of fluoride disinfectants based on local raw materials in order to neutralize fluorine-contaminated soils in the vicinity of industrial enterprises. At the same time, the processes of fluoride ion binding of environmentally safe, biologically active drugs obtained on the basis of various bentonites, humic substances and chemically and physically modified bentonites were carried out in 0.1 normal sodium fluoride solution. Interaction of fluoride ion in fluoride solution with bentonite samples, oxidized charcoal, humic acid extracted from oxidized charcoal and humic calcium was studied in a wide range (100: 1 to 100:10) of the ratios of fluoride solution and the mentioned drugs.
Durdona Azimova, Dilnoza Salikhanova, Gulmira Nomozova, Izzat Eshmetov, and Uktam Temirov
EDP Sciences
The results of the analysis of the waste water of the industrial enterprise containing iron ions and the analysis of these iron ions on the basis of defecate is being as a local sugar production waste are presented. In the analysis, laboratory tests were conducted for wastewater treatment using samples of the sugar production waste activated at different temperatures. The information on the results of the analysis of the dependences on the activation temperature of the defecate, the stirring time, and the amount of weight added defecate to in order to remove of iron ions from the waste water is presented.
T. Zh. Pirimov, Sh. S. Namazov, U. Sh. Temirov, and N. Kh. Usanbayev
Ore and Metals Publishing House
D Azimova, D Salikhanova, I Eshmetov, F Umirov, and U Temirov
IOP Publishing
Abstract This article presents the results of quantitative and qualitative characteristics of wastewater from the tailing pond of the Navoi Mining and Metallurgical Combine. Pollutants coming from the processing of ores were determined. The studied effluents had high concentrations of dissolved salts and suspended solids. Laboratory tests were carried out for wastewater treatment using samples of thermally processed defecate and MAP solution. It has been shown that thermal processed defecation and monoammonium phosphate (MAP) solution are effective for wastewater treatment from polluting ions. The consumption of thermally processed defecation was 10 g/l and 25% MAP was 15 ml/l, while the degree of reduction of the elements Ca, Mg, K, Be, AI, Mn, Ni, Cu, Zn, As, Se, Sr, Mo, Pb was 87.82, 90.64, 70.72, 96.35. 92.64, 99.79, 63.69,18.95, 91.12, 98.38, 70.85, 78.56%.
A Saydullayev, Sh Namazov, S Mirsalimova, N Usanbaev, and U Temirov
IOP Publishing
Abstract The objective of this work is to determine the optimal technological mode for obtaining sulfated urea with a balanced content of nitrogen and sulfur by adding ammonium sulfate to the urea melt before granulation. The article presents the results of a study of the dependence of the properties of sulfated urea on the degree of grinding and on the amount of ammonium sulfate, expressed by the mass ratio of CO (NH2)2: (NH4)2SO4 = 100 : (2.5-50). Methods for obtaining, granulating and studying the properties of sulfated urea samples are presented. In fertilizers obtained with the addition of ammonium sulfate to the urea melt at the studied ratios, the strength of the granules increases from the initial 2,53 to 4,80 MPa, the gyroscopic point decreases from 58,4% to 52,3. It was also revealed that when ammonium sulfate is added to the urea melt, the density and viscosity of the melt increase with an increase in the amount of ammonium sulfate introduced. At 135 ° C, an increase in the addition of ammonium sulfate from 2,5 to 50,0 mass parts per 100 mass parts of urea leads to an increase in density from 1,162 to 1,412 g/cm3, viscosity from 2,56 to 7,91 cΠɜ. It was found that the smaller the particle size of ammonium sulfate, the higher the strength of the urea granules. With a decrease in the dispersion of ammonium sulfate particles from 0,25 to 0,04 mm, the strength of sulfated urea granules increases, the presence of ammonium sulfate in the composition of urea reduces the dissolution rate, which makes it possible to prolong their action, in addition, it lowers the pH of the product, which prevents the release of ammonia during storage and transportation sulfated urea.
Pirnazar Ganiev, Atanazar Seytnazarov, Shafaat Namazov, Najimuddin Usanbaev, and Uktam Temirov
AIP Publishing
Ikrom Bozorov, Mahliyo Iskandarova, Abdurasul Mamataliyev, Najimuddin Usanbayev, and Uktam Temirov
AIP Publishing
Uktam Temirov, Nodir Doniyarov, Bakhrom Jurakulov, Najimuddin Usanbaev, Ilkhom Tagayev, and Abdurasul Mamataliyev
EDP Sciences
In the study, the process preparation of phosphorus-humus fertilizers based on low-grade Central Kizilkum phosphorites activated using sulfuric acid in the ratio of 30-70% for decomposition of CaCO3 in the phosphorite followed by addition of activated sludge from municipal waster water was investigated.
Oybek Rasulov, Abdurasul Мamataliyev, Dilnavoz Rasulova, Uktam Temirov, and Shafaat Namazov
EDP Sciences
For the granulation of nitrate-sulfate-carbonate melt, the prilling method is applied using a granulation tower. The composition and properties of new types of fertilizers were studied. It is shown that with the ratio NH4NO3: СаСО3: (NH4)2SO4 = 100: 24: 1 the product contains 28,03% - N, 0,50% - SO3, 10% - СаО and has a granule strength of 6.03 MPa, which is much higher than the strength of pure NH4NO3 granules (1.32 MPa). The absorption of pure AN granules is 4.82 g. With an increase in the proportion of chalk and ammonium sulfate to the NH4NO3: СаСО3: (NH4)2SO4 = 100: 24: 1 ratio, the absorbency of the LAN granules is 2.57g.
U. Temirov, S. Namazov and N. Usanbayev
This paper presents the composition and properties of bird droppings, substandard phosphorites of Central Kyzylkum - mineralized mass and slurry phosphorite, the results of obtaining organomineral fertilizers by acidifying bird droppings with 30% nitric acid from 7 to 4 pH, followed by decomposition of substandard phosphorites by acidified bird droppings with nitric acid. It is shown that when processing substandard phosphorites with acidified bird droppings with 30% nitric acid due to the interaction of organic acids and residual nitric acid with substandard phosphorites, the assimilable form of P 2 O 5 contained in substandard phosphorites increases by 6.5-7.0 times, acidification of bird droppings with nitric acid and addition of substandard phosphorites leads to a sharp decrease in the release of nitrogen-containing and various volatile organic substances into the gas phase affecting the environment. The optimal conditions and the basic technological scheme for obtaining organomineral fertilizers based on bird droppings and substandard phosphorites are given. When processing the mineralized mass with acidified droppings with nitric acid to the pH value = 5 and the ratio of bird droppings: mineralized mass = 1: 0.10, a fertilizer of the composition P 2 O 5total. 5.04%, P 2 O 5 : P 2 O 5total = 62.38%, CaO total = 11.79%, N 3.86%, organic substances 44.20% and humic substances 14.20% is obtained. When processing slurry phosphorite taken in the same ratio and pH, the fertilizer contains P 2 O 5total. 4.42 %; P 2 O 5 : P 2 O 5total = 69.64%, CaO total = 10.51%, N 3.89%, organic substances 44.43% and humus substances 14.30%.
, Namazov Shafoat*, Temirov Uktam, , Usanbaev Najimuddin, and
Blue Eyes Intelligence Engineering and Sciences Engineering and Sciences Publication - BEIESP
The article presents the results of decomposition of substandard phosphorites at a non-full rate of nitric acid (10-50% of stoichiometry on CaO), followed by its processing by bird droppings in various ratios. The optimal parameters for obtaining organic mineral fertilizers are determined, the technological scheme is given and the material balance is calculated, the possibility of obtaining nitrogen-phosphorus-humus fertilizers based on substandard phosphorites and bird droppings is shown, by composition (wt.%): P2O5 total - 6.53; Р2О5 acceptable - 4.04; СаО total - 17.12; N - 4.21; organic matter - 28.38; humic acids - 9,12, fulvic acids - 5,25, water-soluble organic substances - 4,2; pН – 5,93.