Nitric acid leaching of polymetallic middlings of concentration

Investigations into the nitric acid leaching of polymetallic middlings with the purpose of the maximal recovery of copper and zinc into the solution are performed. Using methods of mathematical planning of the experiment, the optimal process parameters are determined: ratio L: S = 5, the consumption of nitric acid is 80 cm3 per 20 g of the charge, and the process duration is 120 min. © 2013 Allerton Press, Inc

Electroextraction of lead from a lead trilonate solution

Laboratory studies of the cathode process of the electroextraction of zinc from the trilonate electrolyte obtained after the purification of solutions after leaching lead cakes of zinc production are performed. The potential scan rate is determined by recording potentiodynamic curves; the optimal electrolyte acidity, the composition, and the temperature are established. Values of activation energy confirming the concentration nature of process polarization are found. © 2013 Allerton Press, Inc

Technology for the hydrometallurgical processing of a complex multicomponent sulfide-based raw material

An analysis of the methods currently used for the metallurgical processing of polymetallic middlings from the beneficiation of sulfide ores shows that the oxidant which is the most promising for use as an agent to leach the middlings is nitric acid. A technology is developed to process hard-to-decompose middlings with the use of nitric acid. © 2013 Springer Science+Business Media New York

Status of the organized recycling of cadmium-bearing secondary raw materials

The main methods being used in metallurgy to systematically recycle cadmium-bearing secondary raw materials are examined. Hydrometallurgical methods which use sequestering reagents that can be regenerated are the most promising technologies from the standpoint of suitability for industrial use, environmental safety, and the selectivity with which cadmium is extracted. © 2013 Springer Science+Business Media New York

Processing of technogenic lead-containing intermediates using complexing agent solutions

Methods are reviewed for processing technogenic lead-containing waste from nonferrous metallurgy enterprises. Use of different amine and phosphorus-containing complexing agents is considered. Process characteristics are provided. © 2013 Springer Science+Business Media New York

АЗОТНО-КИСЛОТНОЕ ВЫЩЕЛАЧИВАНИЕ ПОЛИМЕТАЛЛИЧЕСКИХ ПРОМПРОДУКТОВ ОБОГАЩЕНИЯ

Investigations concerning nitric acid leaching of polymetallic middlings for the purpose of maximum copper and zinc recoveryinto solution have been carried out. The optimal process parameters: L : S = 5, nitric acid consumption of 80 cm3 per 20 g weightedquantity, and process duration of 120 min were determined using the methods of mathematical design of the experiment.Проведены исследования по азотно-кислотному выщелачиванию полиметаллических промпродуктов с целью максимального извлечения меди и цинка в раствор. При помощи методов математического планирования эксперимента определены оптимальные параметры процесса: соотношение Ж : Т = 5, расход азотной кислоты – 80 см3 на 20 г навески,продолжительность процесса – 120 мин