Aluminium Technology & Production in Russia
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1 L Aluminium Technology & Production in Russia Victor Mann, Deputy General Manager, s Construction Division
2 Soderberg technology Over 80% of aluminium in Russia is manufactured on the basis of Soderberg technology ADVANTAGES: DISADVANTAGES No process areas: -anode molding; -anode baking; -anode rodding; -processing of butts. Metal manufacturing cost is ~ $100 lower than for pre-baked anodes Environmental problems including emission of resinous substances and PAH Difficult working conditions High specific consumption of carbon High specific consumption of electric energy Can Soderberg technology compete with pre-baked anode technology?
3 Current opportunities of Soderberg technology Main process package currently implemented at aluminium smelters - dry gas cleaning; - automated alumina and fluoride point feeding - dry anode technology; - upgraded burners.
4 Introduction of automated alumina point feeding Advantages of automated alumina point feeding Reduction of emissions due to alumina feeding without destruction of the cryolite-alumina crust between anode and wall (F total ~ 10%; dust ~ 12,5%; resinous substances ~ 3%) Fluorinated alumina feeding (reduction of emissions due to dry gas cleaning) 0,5-1,0% increase in current efficiency Possibility of increasing the amperage Reduction of fluoride consumption
5 Installation of dry gas treatment centres in potrooms Increasing recovery of fluorine compounds 99,5%, recovery of resinous substances and benzapilene up to 95 97% Decrease of dry cleaning dust and residues ~25 kg/t Al; Reduction of aluminium flouride consumption ~ 15 kg/t Al;
6 New opportunities of Soderberg technology New technology on the basis of colloidal anode is being introduced in S pilot area and includes the following: - «colloidal» anode technology; - pot hood (tightness); - use of cryolite-alumina charge; - increasing efficiency of anode gases afterburning; - new equipment for pot maintenance
7 Colloidal anode technology The main element colloidal anode paste, demonstrating thermal resistance within a wide temperature range ( С) Dry Colloidal Relative elongation factor, % Colloidal paste plasticity curve Colloidal anode working range Dry paste plasticity curve Dry anode working range (27-28% of pitch) Binder content, % Dry Colloidal Colloidal anode provides for stability of physical properties when pitch content is close to that of a pre-baked anode - PAH emissions are reduced by over 50%
8 Soderberg technology pot sealing Pot hoods: Provide for organised gas removal not less than 94 %; Reduction of emissions, %: - F total 12,9 - PAH 38,9 - CO 57,4 Alumina Charge Cryolite-alumina charge: Reduction of emissions, %: - F total 16,1 - PAH 17,9 - CO 34,0
9 New equipment for pot maintenance Devices and complexes for: -AlF 3 automated feeding - anode cutting and molding; - anode beam racking; -delivery and uniform feeding of anode paste; -centralised alumina distribution, dense phase - cleaning of studs
10 Soderberg technologyupgrading perspectives Specific emission of pollutants on the basis of colloidal anode Soderberg technology, kg/t Al Ingredients F total CO Dust Benzapilene Soderberg technology (colloidal anode) 0,60 45,0 0,7 0,01 Recommended by OSPAR 2010 Soderberg F total not over 0,6 Not fixed 1,0 0,01.
11 Soderberg technology difficulties or perspective opportunities Economic values of environmental upgrading by the example of Bratsk Aluminium Smelter Value Primary metal output (x 10 3 t/year) Capital costs (x 10 3 $/t) Production costs ($/t) Transition to colloidal anodes ~ 50 $/t less than for pre-baked anodes Transition to prebaked anodes
12 Pre-baked anodes technology (РА-300 and РА-400) COMMISSIONED: РА-300 December, 2003 РА-400 December, 2005 РА-300 technology audited by independent experts Plan of РА-300 technology demonstration (confirmation) to foreign financial institutions developed Aluminium smelter constructed in Sayanogorsk, the smelter will work on the basis of РА-300 technology
13 РА-300 technology busbars pot of high electromagnetic stability Cathode shell minimum deformation and improved heat emission Lining, providing for bottom integrity and optimum energy balance of the cell Anode superstructure new system of gas removal from the pot construction fewer supports
14 Designing the pot The pot has been designed with use of ArcRusal, Blums models of electric and magnetic fields, hydrodynamics and pot MHD-stability The following has been used for heat balance: ANSYS, STAR-CD models of thermoelectric fields, strain-stress condition, aero- and hydrodynamics
15 Construction data # Name Meas. unit РА300 technology 1 Number of pots in the potroom pc Potroom dimensions m 1210 х 27 3 Pot dimensions m 15,68 х 4,76 х 1,78 4 Centre-line dimension m 6,5 5 Number of cranes pcs./potline 9 6 Transfer crane pcs./potline 1,0 7 Weight of construction metalware t/pot 37,5 8 Weight of the cathode shell t/pot 44,4 9 Weight of the busbars t/pot 53,1
16 Target project parameters Parameter RA-300 RA-400 Amperage, ka Anode current density, A/cm2 Current efficiency, % Productivity, kg/day Electricity consumption, kwh/t Average voltage, V Consumption of anodes, kg/t Anode effect frequency, times/pot per day Specific F emissions, kg/t >93.5 > < < ± ±0.05 gross net
17 Comparison of RA-300 and RA-400 technologies Parameters / Technology Number of pots in potline Number of potlines Smelter capacity, ktpa CAPEX for construction, $ mln RA RA Specific CAPEX, $ ths/tonne Specific annual metal output from area, tonne/m 2 At use of RA-400 technology, the reduction of specific CAPEX is up to ~ 300 $/tonne of aluminium
18 Principal design advantages of RA-400 In order to improve environmental indicators, extend service life, reduce consumption of materials and improve MHD-parameters of pots, RA-400 project implements new design elements, differing from RA-300: gas exhaust system; doubled anodes; graphite, two-groove bottom blocks; decreased socle height; and busbar design. March problem statement December start-up of first RA-400 pot
19 "SAAT" process control system Original control algorithms (including use of Fuzzy-Logic and neuronets) The software package includes expert systems and control of overheating temperature.
20 Point-feeding system Alumina feeding in hyperdense phase. Modular design, bunkers of the system are easily taken out. Visualised operation mode of the system. The system is similar to best foreign analogues according to technical characteristics. Capacity - 40 tph. Low values of CAPEX and OPEX.
21 Package of RA-300, RA-400 technologies Cathode busbar Pot design Point-feeding system "SAAT" process control system Process documentation Patents and "know-how"
22 High current density reduction technology In August 2006, started tests of the high current density reduction technology: Parameters Current density, A/cm 2 Current efficiency, % (expected) Electricity consumption, kwh/tonne (expected) Gas hooding efficiency, % Consumption of anode blocks, kg/tonne Anode effect frequency, times/day Value >1.2 > < 0.1
23 High current density technology. Advantages of the new technology. RA-300 (320 ka) RA-300M (430 ka) Smelter's capacity is increased by 35% Pot tending crane To gas treatment Busbar Potroom Pot RA-300M (430 ka) Partial use of typical designs at construction: Potroom Foundations and supports Pot tending crane Pot relining shop Casting area Anode plant Alumina transport and warehouses Gas treatment Rectifier Typical design Modernisation, extra costs 15% 30% 10% 20% 20% Typical designs New designs Reduction of CAPEX by 15%
24 Key results of studies of high current density reduction technology Busbar design allowing for high MHD-stability at low ACD (reduced by 20-30%) was created; Cathode with increased heat dissipation and improved uniformity of current distribution was created; Anode superstructure for operation at high current density was developed; Bath composition for operation at high current density was developed; and Special heat and mass balance control algorithms were developed.
25 Organization of pilot area for technology tests Schematic diagramme of infeed and compensation of pilot area # 1 55kA 2 55kA 140 ka 100 ka Potroom. 26 August 2006 start-up of pilot pots. Unit # 602 Bypass Compensation circuit 15 ka September 2006 achieved amperage 200 ka in a cell of pot 120 ka technology development, achievement of stable indicators.
26 Future technology. Pots with vertical inert electrodes Materials and technologies for wet (inert) cathodes were developed. Specific cost is ~ $/m 2 Stage: experimental-industrial tests 5 pots of S160M4 type with wet bottom are operated: Estimates: Service life of coating 4-5 years Extension of pot service life 6 months Increase of current efficiency by 1-1.5% (CAPEX $/t Al)
27 Development of inert anode material New metal and ceramic inert anodes were developed and tested in traditional conditions A series of oxide-based anode materials was laboratory developed and tested. Expected results in 2006: Usage of materials based on complex oxides years
28 Advantages of pots with vertical electrodes Increase of specific capacity from ~10 to ka/m 3 Reduction of specific electricity consumption to < 12 kwh/kg of Al Possibility of conversion to low-temperature reduction Expansion of the range of used types of anode materials! Significant decrease of CAPEX (pot and potroom dimensions are decreased by 3-5 times; specific costs for busbar are reduced)
29 "Vertical" pot. Concept Pot type Horizontal pot Horizontal drained pot Vertical pot Specific capacity + Reduction temperature about 950 0C about C about C Anode service life Pot service life Environment Oxygen emissions +/- Bottom with cathode coating +/- + Oxygen emissions, less salt evaporation, less exhausted lining +/- + Oxygen emissions + Bottom is not cathode, less corrosion of materials Construction CAPEX Production cost + +/- +
30 Growth strategy Thank you for attention! Tel: Fax:
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