innovative system solutions METTOP GmbH Peter-Tunner-Strasse Leoben AUSTRIA
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1 innovative system solutions METTOP GmbH Peter-Tunner-Strasse Leoben AUSTRIA office@mettop.com
2 Leoben, Austria METTOP GmbH is an Austrian engineering company. The company focuses on providing metallurgical process improvements for the copper industry. The activities are arranged in METTOP FIS and METTOP ITT.
3 METTOP-BRX-Technology
4 Parallel Flow: METTOP-BRX-Technology
5 Current Density [A/m²] The next Step in Electrorefining More than 400 A/m² A/m² A/m²
6 Furnace Integrity Cooling Solutions
7 Ionic Liquids Result: fixed lattice Consequence: solid anions cations Result: low order Consequence: liquid anions cations, non spherical
8 Ionic Liquids Melting point of below 100 C or even room temperature Decomposition temperature 450 C Long term stability between 50 to 200 C No vapour pressure below decomposition point Not flammable below thermal decomposition Non-toxic
9 Small leak leads to huge amounts Explosions and damage Explosion Copper Cooling element Copper/Steel Water Cooling medium Ionic liquid 7 to 15 C Temperature difference 150 C max 60 C Operation temperature 200 C
10 ILTEC System Hardware
11 Thermodynamic Process Modelling
12 Thermodynamic Simulation of Copper Scrap Refining Andreas Filzwieser Process model HSC Chemistry Excel based spreadsheets FactSage data Gibbs minimizing module Manual data Based on experience
13 Raw Materials Secondary raw materials are extremely different in respect of: Content and form of Cu and base metals Content of trace elements, e.g. precious metals Content and form of (hazardous) impurities Scrap Cu Fe Zn Pb Sn Ox. Org. PM Pure scrap High grade scrap Cu-Fe material Cu-Zn alloy Electronic scrap Shredder material Residues (20) (15) (5) (2) (2) 80 8 Reverts (20) (5) (10) (2) (1) 90 0
14 Direct-To-Wire Low quality scrap Secondary raw material Smelting & Refining High quality scrap Smelting Refining Casting wheel Electrorefining Shaft furnace Conventional route FRHC copper (Fire Refined High Conductivity) ETP copper (Electrolytic Tough Pitch)
15 Example: Processing of Low Grade Scrap
16 Batchwise Process 1) 4) 11) TSL (2 stages) RDF 1) Secondary raw material 2) Discard slag TSL 3) Raw copper TSL 4) Converter slag TSL 5) Raw copper RDF 6) Alloy RDF 7) Discard slag RDF 8) Raw copper HF 9) High grade scrap 10) Anode copper AF 11) Refining slag AF 3) HF 2) 8) 9) AF 5) 6) 10) 7)
17 Batchwise Process Step 1: Smelting Charging of about 90 % of the input material Smelting under reducing conditions Autothermic (sufficient amount of organics) Products Black copper Discard slag ( % Cu) Flue dust (1 2 % of the input) Off gas (contains CO and H 2 ) Post combustion in the upper furnace Discard slag Black copper
18 Batchwise Process Step 2: Tapping Discard Slag Major part of the discard slag is removed There must always be a certain amount of slag in the furnace Tapping time depends on the capacity of the granulation unit
19 Batchwise Process Step 3: Converting (+ Smelting) Residual 10 % of the input are charged Converter slag Raw copper Converting to raw copper Oxidizing conditions and high copper losses in the slag Products Raw copper (about 96 % Cu) Converter slag (about 25 % Cu) Flue dust Off gas (contains O 2 )
20 Batchwise Process Step 4: Tapping Raw Copper Raw copper is tapped completely through the bottom of the furnace to the holding furnace or directly to the tilting furnace
21 Batchwise Process Step 5: Tapping Converter Slag The converter slag is tapped and charged into the reduction furnace Again, there must remain a certain amount of slag in the furnace
22 Batchwise Process 1) 4) 11) TSL (2 stages) RDF 1) Secondary raw material 2) Discard slag TSL 3) Raw copper TSL 4) Converter slag TSL 5) Raw copper RDF 6) Alloy RDF 7) Discard slag RDF 8) Raw copper HF 9) High grade scrap 10) Anode copper AF 11) Refining slag AF 3) HF 2) 8) 9) AF 5) 6) 10) 7)
23
24 Slag carryover to the next process step Metal droplets in the slag phase Carryover of solid particles to the offgas treatment Post combustion in the upper furnace Defined Steam production Possibility of adding agents Energy balance must consider heat losses and heat transmission
25 Process model HSC Chemistry Excel based spreadsheets FactSage data Gibbs minimizing module Manual data Based on experience
26 Iteration Procedure First iteration concerns single process steps Second iteration calculates interrelations between single steps at least 50 iteration rounds
27 Example: Processing of High Grade Scrap 1) Secondary raw material 2) Slag 1 3) Slag 2 4) FRHC copper 1) Tilting furnace 4) 3) 2)
28
29 Inputs which can be optimized Secondary raw material (smelting and oxidation) Limestone an silica addition Air/nitrogen/reductant through the tuyeres Nitrogen for gas purging through porous plugs Natural gas and air for main burner False air Post combustions air and cooling air for offgas
30 Process Modeling Prediction of pyrometallurgical processes with thermodynamic calculations Difference real ideal: kinetics and insufficient thermodynamic data Calculation of mass and energy balances as well as material flows Easier tailor made basic and detail engineering Optimized charging (point and quantity) Parameter study (e.g. for steam production) Slag composition (Fe/SiO 2 ratio, CaO content) Single process steps whole facilities Based on empiric data completely calculated
31 Process Modelling Possibilities Designing pyrometallurgical processes with foresight Examples: Operation mode Batchwise Continuous Parameter study Raw material Steam generation Slag chemistry Silica/limestone addition Ensuring a low viscosity slag
32 Thank you for your Attention METTOP GmbH Peter-Tunner-Straße 4 A-8700 Leoben Austria Tel.: +43 (0) Fax: +43 (0) cu@mettop.com Home:
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