The state of sulfur gas production in Ukraine has been examined. The major producers and consumers of sulfur, as well as available technologies for gases purification from hydrogen sulfide have been characterized. The necessity of applying new methods of gas cleaning from hydrogen sulfide to form sulfur of special grades has been grounded. The advantages of quinhydrone cleaning method to form fine sulfur have been shown.

Abstract. The efficiency of horizontal apparatus with bucket-like dispersers has been theoretically grounded to remove dust from industrial waste gases. The mathematical dependencies have been developed to calculate main technological characteristics. The values of dust-laden gas obtained during red ferrum oxide pigment production have been calculated. The optimum technological regime for apparatus operation has been determined.

The application limits of optical and sonochemical methods to determine the sizes of cavitation bubbles and their derivatives have been analyzed. The effect of cavitation fields generated using an ultrasonic magnetostrictive oscillator and jet hydrodynamic emitter on the parameters of their acoustic signals has been examined. The bubbles size depending on emitter type and parameters has been determined using sonochemical analysis. The character of the dependence was estimated according to Minnaert formula. The bubbles dispersity in the flotation zone may be controlled by varying conditions of cavitation excitation.

Abstract. The oxidation rate of ferrum(II) to ferrum(III) by air oxygen in water has been investigated in the horizontal absorber with bucket-like dispersers. The reaction order relative to Fe 2+ and -OH ions has been determined based on established dependencies of ferrum(II) ions concentration on dispersion time at their various initial concentrations and medium pH. It has been shown for the first time that at pH = 5.5-6.2 in water during oxidation of ferrum(II) ions an autocatalysis occurs due to the formed ferrum(III) ions.

The technological and economic evaluation of two processes of langbeinite concentrate processing in a conditioned fertilizer was carried out with using mineral acids (nitric and phosphatic acid) for its dissolution. The first process allows to obtain non-chloride fertilizer (potassium-magnesium), and the second one allows to obtain not only potassium-magnesium, but such complex nitrogen-phosphorus fertilizer as diammophos. The optimal conditions for realization processes of acid dissolution, salting-out of schoenite from obtained acidsaline solutions using isopropyl alcohol, neutralization of solution phosphoric acid by ammonia were determined. It is shown that the obtained products entirely meet the requirements of standards. Technical and economic calculations confirmed the profitability and feasibility of the proposed technological processes.