Production of magnesium chloride and metallic magnesium from serpentinites of the Kutchinskoye deposit, Uzbekistan T. Zh. Pirimov, Sh. S. Namazov, N. Kh. Usanbaev, U. Sh. Temirov Obogashchenie Rud, 2025 Uzbekistan currently lacks domestic production of metallic magnesium and its compounds, which are widely used across various industries. Serpentinites from the Kutchinskoye and Arvatinskoye deposits are promising local sources of magnesium. This study examines the extraction of magnesium chloride and metallic magnesium through hydrochloric acid decomposition of Kutchinskoye deposit serpentinites, followed by silica separation and neutralization of the filtrate with ammonia to pH 8.5 for impurity removal and magnesium chloride solution recovery. Optimal conditions for magnesium chloride synthesis and dehydration were established, including artificial carnallite formation by adding potassium chloride. Acid treatment increased magnesium chloride content to 8.83 % and silica content to 78.53 %, indicating potential for silicate material applications. Electrolytic production of metallic magnesium was performed in an argon atmosphere, yielding 54.2 g of magnesium from 600 g of carnallite, with a recovery rate of 92.76–97.44 %. Additionally, ballast salts in the filtrate were minimized, achieving a magnesium chloride solution concentration of 71.38 %. These results demonstrate the feasibility of producing metallic magnesium from Kutchinskoye deposit serpentinites. Industrial implementation of this process can enhance raw material utilization, expand product ranges, and improve overall profitability.
Complex Nitrogen-phosphorus-sulfur-containing Fertilizers Based on Ammonia Salt, Phosphate Rock and Phosphogypsum Farhod Ibatov, Abdurasul Mamataliev, Shafoat Namazov, Uktam Temirov E3s Web of Conferences, 2024 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.
Obtaining ammonium sulfate and calcium carbonate by processing natural gypsum and phosphogypsum Jamshid Kholmurodov, Uktam Temirov, Shafoat Namazov, Ruzmat Radjabov E3s Web of Conferences, 2024 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%.
