Introduction: This article aims to discuss the physico-chemical features of the agglomeration process of phosphorus fines using phosphate-siliceous shales and oil sludge. Methods: The composition and structure of the starting materials and physico-chemical transformations under thermal influence are studied using IR spectrometry and differential thermal analysis methods. Results: The results of IR spectrometric analysis of the phosphate siliceous shales are characterized by intense peaks at 493.78, 547.78, and 678.94 cm^-1, corresponding to Ca-O-P compounds. Moreover, the wave oscillations in the region of 837.11-995.27 cm^-1 indicate the characteristics of Si-O valence bonds, and in the region of 1114.86-1431 cm^-1 depict the characteristics of Si-O-Al compounds. The IR spectrum of oil sludge is characterized by the presence of wave oscillations in the region of 1411.89-2904.80 cm^-1 corresponding to petroleum components. Conclusion: The differential thermal analysis of the investigated sample of phosphate-siliceous shale does not have intense endo- and exo-effects, and it is characterized by a significant predominance of hydrate compounds of aluminosilicate and carbonate components.

Physicochemical research of peculiarities of technogenic metallurgical wastes and mathematical optimization of ecologi-cally safe technology of their processing are of great practical importance for solving ecological problems of the region. The aim and the main direction of the research are...

The study has investigated the technical characteristics of a number of sorption materials (natural mineral) and the pos-sibility of their use for the purification of surface and wastewater from oil and oil products. At the first step, regularities of the process of purification of oily waters have been established taking into account the processes of filtration and sorption. After that, the sorption capacity of the sorbents has been estimated, and the factors influencing it analysed. As a final step, the optimal conditions for the sorption process have been selected depending on the conditions and nature of purification. Results indicated that the maximum purification degree has been reached at the concentration of 500 mg∙dm–3 and temper-ature of 20°С.

The article considers the results of studying the thermodynamic computer modeling of the interaction of phosphorite (Karatau basin, Kazakhstan) with carbon and coke performed using the HSC-10 software package and electric smelting of the phosphorite with coke and steel shavings in an arc furnace. The modeling allowed us to determine the equilibrium extraction degrees of phosphorus into gas (Р2, Р4), silicon into ferroalloy in the form of iron silicides (FeSi2, FeSi, Fe3Si, Fe5Si3, Si) and calcium into CaС2. At temperatures above 1500 °C, regardless of the amount of iron, the extraction degree of phosphorus into gas is more 99%. The resulting ferroalloy contains 21.2-23.8% of Si, 1.6-2.8% of Al; the calcium carbide has a capacity of 288-325 dm3/kg. The extraction degree of silicon into the alloy was 89.8%, calcium in CaC2 – 72.5%, phosphorus into gas – 99.4%. The ferroalloy, formed at the electric smelting of the Chulaktau phosphorite together with coke and steel shavings and containing 24.9-29.8% of Si, is FS25 grade ferrosilicon, and the formed calcium carbide has a capacity of 278-290 dm3/kg and belongs to the third and second grades. The developed technology makes it possible to increase the degree of phosphorites’ comprehensive use two times (up to 87.5%).

The article presents the results of physico-chemical and thermodynamic studies of the use of petroleum coke obtained from oil refining waste for use in agglomeration of phosphate raw materials as fuel.Using the method of thin-layer chromatography and IR spectroscopy, groups of organic compounds in the composition of heavy waste used for slow coking of petroleum coke were determined. The obtained results of the analysis of heavy oil waste showed a high content of strong aromatic groups 35.1-54.1%, resin groups 12.0-25.7%, paraffin groups 3.0-41.4%. All these indicators indicate the suitability of heavy oil waste for the production of petroleum coke.The element composition and microstructure of the resulting petroleum coke, which contains C-78.56%, Te-4.05%, Al-12.14%, Si-1.18%, were identified using a scanning electron microscope JSM-6490LV.The results of thermodynamic studies of reactions characteristic of agglomeration firing of a working mixture of phosphorite-phosphate-siliceous shale - neftekox composition are presented, performed using the HSC-5.1 Chemistry software package developed by Outokumpu Research Oy. The results of calculating the Gibbs energy change from the temperature of decarbonization reactions indicate the thermodynamic probability of all studied reactions occurring in the high-temperature region. Moreover, the probability of 5.6 reactions is possible only above 1200K. Thermodynamic modeling of decarbonization of the working systems СаСО_з – С – С₆Н₆ –О₂ и СаСО₃ – С – С₆Н₅О – О₂ were performed in the temperature range 500-1500 K and pressures 0.1-0.01MPa, typical for the agglomeration process using the Astra-4 software package.The results of graphical dependences of the equilibrium distribution of the main components of calcium and carbon depending on temperature and pressure are of the same type. Moreover, as the pressure decreases, the possibility of formation of CaO and CO₂ per 100 K moves to a low-temperature region.

Oriental Journal of Chemistry is a peer reviewed quarterly research journal of pure and applied chemistry. It publishes standard research papers in almost all thrust areas of current chemistry of academic and commercial importance. It provides a platform for rapid publication of quality research papers, reviews and chemistry letters. Oriental Journal of Chemistry is abstracted and indexed in almost all reputed National and International agencies.