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

АНЕСТЕТИК, АНАЛЬГЕТИК, ГИПНОТИК – ВАЖНЫ ЛИ ТЕРМИНЫ?

The review is devoted to pharmacology of the general anesthesia in the light of current understanding of this event and as a medical technique. The discussion covers the classification of medications used for general anesthesia basing on action mechanisms of these substances including specific and nonspecific actions on the central nervous system functions and evolution of their presentation. Обзор посвящён фармакологии общей анестезии в свете современных представлений об этом явлении и медицинском методе. Обсуждаются классификация препаратов, применяемых для общей анестезии, на основе механизмов действия этих веществ, из которых вытекают их специфические и неспецифические влияния на функции центральной нервной системы, а также эволюция представлений о них