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Abstract. Thermal balance and differential scanning calorimetric studies of the aluminium dihydrogen phosphate/quartz system are reported. An interaction involving a chemical bond is demonstrated ...
From the beginning of the year, more than 120,000 tons of simple and triple superphosphates have been delivered to Ukraine. Import of such phosphate fertilizers from Poland has been already increasing from the second half of 2017, and began to approach the annual benchmark of 30,000 tons.
The phosphate ore flotation is achieved through the surface electrical behavior difference among apatite, dolomite and quartz, but it is usually affected by the dissolved ions from pulp, especially Ca2+ and Mg2+. The zeta potentials of apatite, dolomite, quartz, and phosphate ore in different solutions were measured to discuss the surface electrical behaviors of them in this study. It was ...
The broken down beauty of Eastern Ukraine, 25 years after the end of the USSR. The metallurgical plant in Enakievo, the birthplace of ousted Ukrainian President, Viktor Yanukovych. Our home for ...
The formation of phosphate binders in systems based on orthophosphoric acid and the most common refractory fillers in foundry technology has not been previously studied. The phase composition of these inorganic binders was studied, and the formation of silicon SiP2O7 and zirconium ZrP2O7pyrophosphates was confirmed. The study by differential thermogravimetric analysis in the temperature range of 201000°С established the fact that the formed binders are thermally stable and do not emit harmful gaseous substances. The obtained results of the studied binders make it possible to develop new environment friendly core mixtures of thermal hardening.
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The tasks of metallurgy and foundry production are the preparation of alloys and the manufacturing of products from them with a wide range of special properties that are used for both heavy industry 1 1. A. S. Velichkovich, Design features of shell springs for drilling dampers, Chemical and Petroleum Engineering, vol. 43, no. 7 8, pp. 458461, 2007. View at: Publisher Site Google Scholar See in References , 2 1. L. Ropyak, I. Schuliar, and O. Bohachenko, Influence of technological parameters of centrifugal reinforcement upon quality indicators of parts, Eastern European Journal of Enterprise Technologies, vol. 1, no. 5, pp. 5362, 2016. View at: Publisher Site Google Scholar See in References and precision casting 3 1. O. Bulbuk, A. Velychkovych, V. Mazurenko, L. Ropyak, and T. Pryhorovska, Analytical estimation of tooth strength, restored by direct or indirect restorations, Engineering Solid Mechanics, vol. 7, no. 3, pp. 193204, 2019. View at: Publisher Site Google Sc...
Previous studies of new core mixtures, the strengthening of which occurs during heated due to the interaction of Н3РО4 and refractory fillers, gave positive results. In particular, a mixture of 3 4% concentrated acid and 510% quartz dust, the filler of which is quartz sand, after hardening at 300°C, has a compressive strength more than 2.5MPa with a scattering less than 0.30% 33 1. O. P. Makarevych, A. S. Kocheshkov, and R. V. Liutiy, Molding mixture for molds, strengthened by thermal drying, 2003, Patent of Ukraine No. 57460 A. МКІ 7 В22С1/16, 2003, in Ukrainian. View at: Google Scholar See in References . A mixture of 3 4% Н3РО4 and 7 8% zirconium dust, the filler of which is zircon concentrate, after hardening at 350°C, provides a similar level of properties. Mixtures of Н3РО4 and additives of dusty aluminosilicates 2Si4O10 or kyanite sillimanite Al2O3 · SiO2) after hardening at 300°C provide a compressive strength of 1, 4,, 3, 2MPa. These pro...
A multifunctional diffractometer Rigaku Ultima IV was used to determine the phase composition of binders, which performed qualitative and quantitative analysis. The processes that occur during heating were determined using curves of differential thermogravimetric analyses taken from the STA 449C Jupiter. As we have previously established, the mixture based on quartz sand with 14% of orthophosphoric acid is strengthened when heated to 300320°C. The strength depends on the particle size characteristics of the sand. 2.510.0% of the quartz dust in the mixture stabilizes the strength and reduces the flakeability of the mixtures 34 1. R. V. Liutyi and D. V. Keush, Binder system SiO2H3PO4 for foundry cores, Foundry. Technology and Equipment, vol. 4, pp. 2328, 2017, in Russian. View at: Google Scholar See in References , 35 1. R. V. Liutyi, M. V. Tyshkovets, and D. V. Liuta, Foundry core mixtures with orthophosphoric acid and different aluminum containing compounds, Фізика і хімі...
The phase composition of binders obtained from the interaction of orthophosphoric acid and refractory fillers, such as dust silicon, zircon, and kyanite sillimanite, was first investigated. It is found that the formed binders are Si and Zr pyrophosphates and also amorphous Al phosphates. The formation of pyrophosphates is related to the temperature interval of the strengthened mixtures , in which orthophosphoric acid is turned into pyrophosphoric acid. The new binders are thermally stable. This is particularly true for SiP2O7 and ZrP2O7, which are characterized by the absence of transformations when heated. Heating of binders formed from kyanite sillimanite and H3PO4, causes the crystallization of amorphous phosphates, as well as the transformation of acidic aluminum phosphates to the normal state. This is not detrimental to the characteristics of the core mixture.
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Mining And Quarrying Machinery And Equipment Ukraine. Cobble jaw crusher in kenya university. 600 t h crusher plant in kenya. beautiful scene of 300 th stone crushing plant under the setting sun pe 600 x 900 jaw crusher and pyb1200 cone crusher is well sold and good performance in south africa. 3 feet hydraulic cone crusher for basalt crushing plant kenya primary crusher is pe 500x750 jaw ...