MINERAL PROCESSING OF NONFERROUS METALS
Panshin A.M., Yevdokimov S.I., Artyomov S.V.
A new flotation process of ores from Urupsky deposit
To improve the technological parameters of ore beneficiation at theUrupsk deposit, jet flotation diagram and columnar flotation machine have beenapplied for extraction of rough concentrate in the second flotation jet. Incase of columnar flotation, air-steam mixture is used as a gas phase; the mixturehas an additive of foam-producing agent and oleinic acid and it is suppliedinto the column through pneumatic-hydraulic aeration tower ofconvergent-divergent type.
Key words: copper ore, jet flotationdiagram, aerosol as a gas phase.
METALLURGY OFNONFERROUS METALS
Abramov A.S., KhrapunovV.E., Nitsenko A.V., Isakova R.A.
Application of equations of non-isothermal kinetics fordetermination of copper arsenide thermal decomposition range
Taken as an example, the results of experiments for determination ofcopper arsenide decomposition degree and rate in vacuum are used to propose aversion of applying the equations of non-isothermal kinetics for establishmentof the process proceeding area.
Key words: kinetics, decomposition,proceeding area, activation energy, copper arsenide.
Krylova L.N., Gusakov M.S., Adamov E.V.,Vainshtein M.B.
Application of bacterial-chemical oxidation process fordecomposition of nickel-containing raw material
Nickel ore and concentrate processing investigation results aregiven. The processing investigations were realized with application ofmicroorganisms. The investigations were carried out with the followingminerals: copper-nickel sulfide ore (Shanutch deposit), nickel-pyrrhotiteconcentrate (Talnakh processing plant), nickel silicate ore and application ofimmobilized bacteria as surfactants for autoclave leaching, bacterialiron-containing solutions for sulfur-containing gas recycling frompyrometallurgical production. The effect of present flotation reagents andnickel ions on oxidizing activity of biomass has been studied. Combined processflow diagrams to process nickel-containing raw material with application ofbacterial-and-chemical oxidation have been proposed.
Key words: microorganisms,bacterial-and-chemical oxidation, leaching, nickel, minerals, copper-nickelsulfide ore, nickel-pyrrhotite concentrate, nickel silicate ore, flotationreagents, resistance, bio-surfactants, bacterial-autoclave leaching, sulfurdioxide.
METALLURGY OF LESS-COMMON AND PRECIOUS METALS
Zhuravlev V.I., Red’kin S.A.
Pirasole-containing polymeric sorbents for gold and silverextraction from cyanide solutions
The results of investigation for giving hydrophilic properties topyrasole-containing sorbents in cyanide media and improvement of theircapacitive parameters in relation to precious metals are given. It is foundthat an additive of triethanolamine or trimethylamine in amounts of as much as30 % (relatively to 3(5)-methylpyrasole) favorably affects the capacitivecharacteristics of the sorbents on the base of styrenedivinylbenzene and3(5)-methylpyrasole. Introduction of deprotonating additives into reactionmixture in synthesizing SDP-d grade corbent is shown to improve its sorptioncapacity by 20–25 % in silver in extracting from AgNO3 solution (thenumber of functional resin groups increases accordingly). Microporous SDDP-dgrade sorbent with increase content of 3(5)-methylpyrasole groups has beenproduced. Comparison of synthesized resin samples in sorbing from cyanidesolutions has been carried out against high contents of Cu and Zn in theinitial solutions. Au, Ag, Cu, Zn sorption isotherms over SDDP-d resin fromcyanide solutions were recorded and the sequence of sorption capacity: Au >Ag > Zn > Cu was determined.
Key words: cyanide solutions, gold,silver, sorbent, 3(5)-methylpyrasole, styrene, divinylbenzene, static exchangecapacity.
Kudryavsky Yu.P.
Process of deep scandium oxide purification from impurities withproduction of high-purity scandium oxide
A new process flow diagram for processing offgrade scandium oxides(purity 98 %, 99,0 % & 99,9 %) and their decontamination with producinghigh-pure scandium oxide (99.99 %) has been developed and tested. The processis based on different solubility of scandium and impurity element formiates andconsists of dissolution of initial (98,0–99,8 %) Sc2O3 inHCl, NH47, Sc(OH)¸OH treatment to pH = 53 residue filtration and washoutwith water, repulping in formic acid, separation of scandium formiate residuefrom mother solution, scandium formiate washout with formic acid, its dryingand baking with obtaining OS-99,99 grade Sc2O3.
Key words: scandium concentrate,high-pure scandium oxide, scandium formiate, titanium production wasteprocessing.
Zakharov V.I., Maiorov D.V., Alishkin A.R., Matveev V.A.
On causes of zirconium sub-recovery in case of acidic processing of Lovozersk eudialyte concentrate
The chemical and mineralogical compositions of insoluble residuesresulted from acid decomposition of eudialyte concentrate have beeninvestigated. It has been established that one of the reasons for insufficientzirconium extraction is the existence of acid-resistant zirconium minerals(vadeite and altered eudialyte), which are, apparently, the products of naturalhydrothermal alteration of common eudialyte. Another reason is that coarsegrains are coated by silica preventing acid diffusion.
Key words: eudialyte, acid decomposition.
Myakisheva L.V., Chernova O.P., Panov V.S.
Production of finely-dispersed powder gadolinium hydroxide
Finely-dispersed gadolinium hydroxide powders have been produced bychemical deposition (dispergating). The effects of different factors on thepowder characteristics: dispersiveness, morphology, and chemical compositionhave been found. The dependence of indicated parameters is established on thecharacter of gadolinium salt anion, concentration and acidity of its solution,precipitation agent concentration, and deposition pH. Optimum results areobserved in using diluted gadolinium chloride solutions and 5–10 wt. % of NH3solution as a precipitation agent.
Key words: gadolinium hydroxide,chemical deposition, chlorohydric acid, precipitation agent, concentration,powders, dispersiveness, morphology.
Yel’kin O.V., Kovalevsky A.V., Chebykin V.V.
Current-less diffusion saturation of nickel by gadolinium in LiCl–KCl–GdCl3 melt
Kinetic characteristics of alloy-formation during diffusionsaturation of nickel by gadolinium in melted LiCl–KCl–GdCl3 mixturehave been determined experimentally. The results of chemical, micro-X-rayspectrum, and X-ray phase analyses have shown the formation of intermetalliccompounds being Laves phase of GdNi2 composition in the surfacelayer of the alloys during currentless transfer. The coefficients of reactiondiffusion and activation energy are calculated for GdNi2 compound.
Key words: diffusion saturation,currentless transfer, halide melts, rare-earth elements, gadolinium.
CASTINGPRODUCTION
Chernov V.P., Astapov E.N., Safonova E.A.
Investigation of thermal-physical properties and thermal stability of shell molds on the basis of quarts sand and ashes from heat-electric generating plants for casting by the lost-wax process
Having low thermal-physical and thermal properties, quartz mold isthe primary source of reject in casting by the lost-wax process, therefore itis necessary to manufacture shell molds from alternative material that haslower linear expansion and higher heat conductivity. Analysis ofthermal-physical properties and thermal resistance shows the ceramic shells,where ashes from heat-electric generating plants are used as dusting, to bemost thermally stable, and they can be recommended for pouring without supportmaterial. Because ashes from heat-electric generating plants are productionwaste, this can affect the cost of shell molds, being particularly actual in theperiod when the economic crisis has not been overcome.
Key words: heat conductivity, thermalresistance, shell, dusting, linear expansion, quartz sand, ashes ofheat-electric generating plants, casting by the lost-wax process.
METAL FORMING
Lopatin N.V., Salishchev G.A., Galkin S.P.
Mathematical modeling of VT6 titanium alloy rolling by radial-shapemill under the conditions of globular structure formation
The simulation of titanium alloy VT6 rods rolling by radial-shapemill has been carried out by finite element method in LS-DYNA software. Thestress-strain state analysis of the rod during rolling at rolling temperatureof 940 °C and reduction in area 1,25 is accomplished. The evolution of initiallamellar microstructure to globular one after each pass of rolling wasinvestigated. The peculiarity of microstructure transformation and theirkinetic initiated by features of stress-strain state in axis and surface pointsof rods were established.
Key words: radial-shape rolling,mathematical model, VT6 titanium alloy, kinetic of globular microstructureformation.
POWDERMATERIALS AND COATINGS
Zalazinsky G.G., Shchennikova T.L.
Application of thermodynamic modeling method to description ofprocesses in powder metallurgy
The article describes the methodology of thermodynamic modeling ofphysical and chemical transformations in the processes of powder metallurgy:production of powders by iron-carbon melt dispergating by water, air and theirmixture; green powder reduction in the hydrogen and endogas atmosphere; powdermaterial sintering in nitrogen with additive of 5 % hydrogen and in vacuum. Theresults of calculations made for possible compositions of condensed and gasphases of the above processes are described. The obtained data is used in thedevelopment of process to produce powders and shot, which are low-alloyed withvanadium and chromium.
Key words: thermodynamics, modeling,dispergating, reduction, sintering, structure, gas phase, condensed phase,powder, shot.
PROCESSCONTROL AND AUTOMATION
Rutkovsky A.L., Dyunova D.N.
Product yield forecasting method in unobserved flows
A method is proposed, under the conditions of incompleteinformation, to forecast the mass flow rate of the unobservable material flowsof continuous technological objects on the basis of the results of currentchemical analysis for their effective monitoring and control for the purpose ofimprovement of technical-economic indexes.
Key words: method of mass flow ratesforecasting, continuous technological objects, effective monitoring andcontrol.
Soshkin G.S., RutkovskyA.L., Soshkin S.V.
Development of the system for coal-graphite material roastingprocess control on the basis of modeling of roasted product quality indices
Regressive models connecting volatile-matter content, change inproduct density, mechanical strength, and porosity with time-varying roastingtemperature have been developed on the basis of experimental investigation dataprocessing. The obtained dependences allow forecasting the roasting process inindustrial furnaces for various temperature and initial conditions. Thestructure of the system to control electrode product roasting process inmultichannel furnaces has been developed on this basis.
Key words: roasting, coal-graphite material,statistic model, electrode quality, control system.
INFORMATION
On meeting of D.V. Livanov, Rector of “MISiS” NITU withmetallurgical works managers on personnel development
CHRONICLE
In memoriam of professor I.F. Khudyakov
