The urgent task facing the metallurgical industry is the use of calcium hydrocarbon aluminate (CCAA) synthesized under alumina production conditions as a multifunctional coagulant for wastewater treatment. Researches, executed under the direction of V. Sizyakov at Chair of Non-ferrous Metals Metallurgy of St.Petersburg Mining Institute together with specialists of Russian aluminium-magnesium Institute (VAMI) established that in medium of strong electrolytes in conditions of alumina production GKAK crystallizes in a wide range of temperatures (from 20 to 100 °С) for 40 min. Coagulant tests were carried out at the following sites: Central Design Bureau of Machine Building “Rubin”, electric depot “Dachnoye” of subway, Kamenskaya paper and cardboard factory, carburetor plant, plant named after Degtyarev and at a number of other large enterprises. From the economic point of view, application of HCCA as coagulant will advantageously influence both the activity of plant-producer and potential consumers of coagulant. For example, the application of HCAK in the technological scheme of after-treatment of the combined galvanic drains of Degtyarev plant allows decreasing the doses of coagulant Fe2SC>4 by 2-3 times and flocculant PAA (polyacry-lamide) by 5-10 times compared to the doses, used in practice of waste water treatment.
A brief summary of the research and engineering work performed by professors, graduate students, and students of the Department of Furnaces, Control and Automation of Metallurgical Processes in 2000 is given. Two main directions of research activities were modeling of technological equipment for metal production and modeling of control systems for industrial metallurgical furnaces. In the first direction of research the following mathematical models were developed: converter conversion of smelting shop of Pechenganickel metallurgical plant; ore thermal smelting process; dissolution and liquation processes; waste water treatment using calcium hydrocarboaluminate. The technology of zinc-tin iron dust processing in a rotary kiln was also developed. A method of separating suspensions using LAROX PF press-filters was introduced. The second area of research includes works on development of spectral density method for synthesis of control systems with intermittent lag and on improvement of efficiency of manipulation of gas regimes in converters.