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Verkhnyaya Pyshma, Russia

Panshin A.M.,LLC UMMC Holding | Kozlov P.A.,ZINC Inc | Terentev V.M.,ZINC Inc
Tsvetnye Metally | Year: 2014

Disturbances of zinc concentrates' roasting process in fluid-bed furnaces of modern plants are related to change of chemical composition and physical properties of concentrates. Thermodynamic possibilities of sulfide zinc concentrates' oxidizing reaction were studied and defined for fluid-bed furnace conditions. Definition of technological parameters of roasting is necessary for definition of speed of sulfide zinc concentrates' oxidizing reactions. Kinetics of oxidizing reactions for the solid body - gas system in laboratory fluid-bed furnaces was investigated. Dependence of oxidization ratio on the particle size of original product was defined together with optimal size of concentrate particles, where the oxidation speed is limited by the quantity of feeding oxidizing substance. There were shown the reasons of the furnaces operation declination during the roasting of fine zinc concentrates. There was made a conclusion about the negative influence of the small size particles' predominance in the fluid-bed furnace on roasting process. Roasting products with minimum content of sulfides can be obtained by controlling of grain fineness of the calcine in fluid-bed furnace during roasting. There are presented the recommendations for changing of technological parameters of roasting for industrial furnaces. © Designed by: "Ore and Metals" Publishing House, journal "Tsvetnye Metally", 2014.

Fatkhutdinova O.A.,ZINC Inc | Panshin A.M.,LLC UMMC Holding | Zatonskiy A.V.,ZINC Inc | Kozlov P.A.,ZINC Inc
Tsvetnye Metally | Year: 2015

This paper discusses the results of research, carried out on pilot zinc production waste water treatment unit. The first stage of the pilot trials is chemical treatment of waste waters (using reagents) and their concentration on reverse osmosis unit. Deficiency of sulphurous zinc materials shows the need to engage recycled material in processing. During recycling process, secondary raw materials are cleaned from impurities derived by sewage. Chlorides, sulfates and sodium fluorides are the main impurities removed by sewage. Standard limestone technology of waste water treatment does not give the possibility to remove the foregoing soluble impurities from waste waters. Return of waste waters to the process is not possible owing to the harmful effect of sulphates, chloride and fluoride on the process of zinc extraction. Developed technology of waste water treatment allows to use the purified water in industrial production and direct the concentrate acquired from reverse osmosis to evaporation. Optimal conditions and parameters of the following processes are defined:-chemical treatment of waste water (adding reagents): pH=11.3-11.6; residual hardness-less than 1.0 meq/l; heavy metals precipitation degree-93-98,9%;-ultrafiltration: transmembrane pressure-0.6 bar, partition coefficient-85%; filtration rate-375 l/m2h; filtrate turbidity-0,6 NTU;-reverse osmosis: concentration of soluble salts using two stage reverse osmosis (in the concentrate) is 2.27 mg/dm3 (48-52 bar at the pressure on the first stage, and 60-64 bar at the pressure on the second stage), total concentration of salts in permeate is 27.4 mg/dm3.

Kozlov P.A.,ZINC Inc | Panshin A.M.,LLC UMMC Holding | Vyatkin V.N.,ZINC Inc | Reshetnikov Yu.V.,ZINC Inc
Tsvetnye Metally | Year: 2015

This article considers the possible methods of processing of copper production dusts with extraction of Zn, Pb and Sn. Urgency of processing of these raw materials at zinc plants is defined by exhaustion of natural reserves of Zn ores, increased amounts of cumulation of defined zinc-containing product in copper industry, and solving of ecological problems. Waelz-processing together with other oxidized Zn-Pb-containing materials and Waelz-oxide processing are the existing dust processing technologies, which solve the problem of Zn extraction in solution and Pb extraction in solid product, required for pyrometallurgical technology. Taking into account economic reasonability of Sn extraction from copper production dusts, the task of this metal transfer during processing in concentrated product is still urgent. On the basis of the data of chemical and phase analysis of copper production dusts, and research of thermodynamic and kinetic parameters of pyrometallurgical processes, there is developed the technology of selective extraction of Zn into solution for hydrometallurgical processing. At the same time, Pb is extracted in concentrated product with its content of 40-50% and extraction rate of 95-99%, while Sn is extracted into product, containing 10-20% of this component, with extraction rate of 60-64%. Technology includes the pyrometallurgical stage-roasting of raw materials with Pb removement in sublimates and cinder hydrometallurgical processing stage. Pb is transferred in sulfide form for efficient distillation. There are given the data about technological parameters of roasting and content of obtained product. Extraction of Zn and Sn in cinder is 90% and 70-75%, respectively. Sublimation rate of Pb is 98-99%.

Panshin A.M.,LLC UMMC Holding | Matyukhin V.I.,Ural Federal University | Kozlov P.A.,ZINC Inc | Matyukhin O.V.,Ural Federal University
Tsvetnye Metally | Year: 2015

Conventional division of working space of rotary furnace on processing zones (drying, sulfate and carbonate decomposition, material recovery (reaction zone), oxidative and clinker cooling) allowed to establish peculiarities of heat and mass transfer processes under conditions of counter flow movement of charge and gases. There were determined the regularities of changes in temperature of gaseous medium and materials in working space of heating unit, depending on ratio of specific heats of charge flow and gas flow components. Progressive increase in heat capacity of the flow is observed during the gas transfer in working space of rotary tube. Peculiarities of specific heat changes of materials flow depend on intensity of heat and mass transfer processes development in separate technological zones. The heat capacity of material flow increases in drying and reduction zones due to development of endothermic processes, and values of this characteristics are reduced in oxidizing and cooling zones. The most intensive development of heat transfer processes occur in the zone of charge preheating and formation of heat carrier flow (Wm < Wr). The least intensity of heat exchange with formation of high-temperature gas flow is observed in oxidizing furnace zone. Considering peculiarities of thermal compression of bulk materials, there were defined the intervals of their solid and liquid phase sintering, indicating conditions of intensive development of rotary furnace process without breaking of high temperature annealing conditions. Rotary furnace process of ore components occurs mainly in the solid phase sintering mode, which determines the minimum diffusion difficulties for the development of recovery processes with maximum output of zinc.

Panshin A.M.,LLC UMMC Holding | Reshetnikov Yu.V.,ZINC Inc | Ivakin D.A.,ZINC Inc | Geraskin V.V.,ZINC Inc
Tsvetnye Metally | Year: 2015

Chelyabinsk Zinc Plant developed the technology of processing of zinc-, lead-and tin-containing copper industry dusts, including the following stages:-pyrometallurgical stage-calcination with addition of sulphidizer, flux and reducing agent to the product, where lead is removed from the product with transfer in processed sublimates, while zinc and tin stay in cinder;-hydrometallurgical stage-high-temperature leaching of cinder, where zinc, iron, coper, etc are extracted in solution with obtaining of tin-concentrating solid residue. There is considered the hydrometallurgical stage of obtaining of tin-containing concentrate from cinder with low content of lead (less than 1%). There is shown the low extraction of zinc in solution and absence of selective separation of tin and lead with acid sulfuric-acid dust leaching without application of pyrometallurgical stage. Three-stage leaching (similar to the technology of hydrometallurgical processing of Waelz-oxides, existing in Chelyabinsk Zinc Plant) and one-stage high-temperature leaching were researched for obtained cinder. Three-stage product leaching is low-efficient, because it requires many equipment and does not provide the required concentration of tin in solid residue. About 98% of zinc, contained in cinder, more than 95% or copper and iron is transferred in solution during the high-temperature product leaching by waste zinc electrolyte with addition of sulfuric acid (t=80-90 °C, concentration of H2SO4 is 160-170 g/dm3). Obtained solution is required for application in technological cycle of zinc plant. Solid residue contains 14-21% of tin, which allows to use it at tin enterprises.

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