generische Förderung von Bleierz zur Bleiverhüttung: Beschreibung siehe Metall\Blei-D-mix Auslastung: 1h/a Brenn-/Einsatzstoff: Ressourcen Flächeninanspruchnahme: 0,0222m² gesicherte Leistung: 100% Jahr: 2000 Lebensdauer: 1a Leistung: 1t/h Nutzungsgrad: 50% Produkt: Metalle - NE
technologyComment of gold mine operation and refining (SE): OPEN PIT MINING: The ore is mined in four steps: drilling, blasting, loading and hauling. In the case of a surface mine, a pattern of holes is drilled in the pit and filled with explosives. The explosives are detonated in order to break up the ground so large shovels or front-end loaders can load it into haul trucks. ORE AND WASTE HAULAGE: The haul trucks transport the ore to various areas for processing. The grade and type of ore determine the processing method used. Higher-grade ores are taken to a mill. Lower grade ores are taken to leach pads. Some ores may be stockpiled for later processing. HEAP LEACHING: The ore is crushed or placed directly on lined leach pads where a dilute cyanide solution is applied to the surface of the heap. The solution percolates down through the ore, where it leaches the gold and flows to a central collection location. The solution is recovered in this closed system. The pregnant leach solution is fed to electrowinning cells and undergoes the same steps as described below from Electro-winning. ORE PROCESSING: Milling: The ore is fed into a series of grinding mills where steel balls grind the ore to a fine slurry or powder. Oxidization and leaching: Some types of ore require further processing before gold is recovered. In this case, the slurry is pressure-oxidized in an autoclave before going to the leaching tanks or a dry powder is fed through a roaster in which it is oxidized using heat before being sent to the leaching tanks as a slurry. The slurry is thickened and runs through a series of leaching tanks. The gold in the slurry adheres to carbon in the tanks. Stripping: The carbon is then moved into a stripping vessel where the gold is removed from the carbon by pumping a hot caustic solution through the carbon. The carbon is later recycled. Electro-winning: The gold-bearing solution is pumped through electro-winning cells or through a zinc precipitation circuit where the gold is recovered from the solution. Smelting: The gold is then melted in a furnace at about 1’064°C and poured into moulds, creating doré bars. Doré bars are unrefined gold bullion bars containing between 60% and 95% gold. References: Newmont (2004) How gold is mined. Newmont. Retrieved from http://www.newmont.com/en/gold/howmined/index.asp technologyComment of primary lead production from concentrate (GLO): There are two basic pyrometallurgical processes available for the production of lead from lead or mixed lead-zinc-sulphide concentrates: sinter oxidation / blast furnace reduction route or Direct Smelting Reduction Processes. Both processes are followed by a refining step to produce the final product with the required purity, and may also be used for concentrates mixed with secondary raw materials. SINTER OXIDATION / BLAST FURNACE REDUCTION: The sinter oxidation / blast furnace reduction involves two steps: 1) A sintering oxidative roast to remove sulphur with production of PbO; and 2) Blast furnace reduction of the sinter product. The objective of sintering lead concentrates is to remove as much sulphur as possible from the galena and the accompanying iron, zinc, and copper sulphides, while producing lump agglomerate with appropriate properties for subsequent reduction in the blast furnace (a type of a shaft furnace). As raw material feed, lead concentrates are blended with recycled sinter fines, secondary material and other process materials and pelletised in rotating drums. Pellets are fed onto sinter machine and ignited. The burning pellets are conveyed over a series of wind-boxes through which air is blown. Sulphur is oxidised to sulphur dioxide and the reaction generates enough heat to fuse and agglomerate the pellets. Sinter is charged to the blast furnace with metallurgical coke. Air and/or oxygen enriched air is injected and reacts with the coke to produce carbon monoxide. This generates sufficient heat to melt the charge. The gangue content of the furnace charge combines with the added fluxes or reagents to form a slag. For smelting bulk lead-zinc-concentrates and secondary material, frequently the Imperial Smelting Furnace is used. Here, hot sinter and pre-heated coke as well as hot briquettes are charged. Hot air is injected. The reduction of the metal oxides not only produces lead and slag but also zinc, which is volatile at the furnace operating temperature and passes out of the ISF with the furnace off-gases. The gases also contain some cadmium and lead. The furnace gases pass through a splash condenser in which a shower of molten lead quenches them and the metals are absorbed into the liquid lead, the zinc is refined by distillation. DIRECT SMELTING REDUCTION: The Direct Smelting Reduction Process does not carry out the sintering stage separately. Lead sulphide concentrates and secondary materials are charged directly to a furnace and are then melted and oxidised. Sulphur dioxide is formed and is collected, cleaned and converted to sulphuric acid. Carbon (coke or gas) and fluxing agents are added to the molten charge and lead oxide is reduced to lead, a slag is formed. Some zinc and cadmium are “fumed” off in the furnace, their oxides are captured in the abatement plant and recovered. Several processes are used for direct smelting of lead concentrates and some secondary material to produce crude lead and slag. Bath smelting processes are used: the ISA Smelt/Ausmelt furnaces (sometimes in combination with blast furnaces), Kaldo (TBRC) and QSL integrated processes are used in EU and Worldwide. The Kivcet integrated process is also used and is a flash smelting process. The ISA Smelt/Ausmelt furnaces and the QSL take moist, pelletised feed and the Kaldo and Kivcet use dried feed. REFINING: Lead bullion may contain varying amounts of copper, silver, bismuth, antimony, arsenic and tin. Lead recovered from secondary sources may contain similar impurities, but generally antimony and calcium dominate. There are two methods of refining crude lead: electrolytic refining and pyrometallurgical refining. Electrolytic refining uses anodes of de-copperised lead bullion and starter cathodes of pure lead. This is a high-cost process and is used infrequently. A pyrometallurgical refinery consists of a series of kettles, which are indirectly heated by oil or gas. Over a series of separation processes impurities and metal values are separated from the lead bouillon. Overall waste: The production of metals is related to the generation of several by-products, residues and wastes, which are also listed in the European Waste Catalogue (Council Decision 94/3/EEC). The ISF or direct smelting furnaces also are significant sources of solid slag. This slag has been subjected to high temperatures and generally contains low levels of leachable metals, consequently it may be used in construction. Solid residues also arise as the result of the treatment of liquid effluents. The main waste stream is gypsum waste (CaSO4) and metal hydroxides that are produced at the wastewater neutralisation plant. These wastes are considered to be a cross-media effect of these treatment techniques but many are recycled to pyrometallurgical process to recover the metals. Dust or sludge from the treatment of gases are used as raw materials for the production of other metals such as Ge, Ga, In and As, etc or can be returned to the smelter or into the leach circuit for the recovery of lead and zinc. Hg/Se residues arise at the pre-treatment of mercury or selenium streams from the gas cleaning stage. This solid waste stream amounts to approximately 40 - 120 t/y in a typical plant. Hg and Se can be recovered from these residues depending on the market for these metals. Overall emissions: The main emissions to air from zinc and lead production are sulphur dioxide, other sulphur compounds and acid mists; nitrogen oxides and other nitrogen compounds, metals and their compounds; dust; VOC and dioxins. Other pollutants are considered to be of negligible importance for the industry, partly because they are not present in the production process and partly because they are immediately neutralised (e.g. chlorine) or occur in very low concentrations. Emissions are to a large extent bound to dust (except cadmium, arsenic and mercury that can be present in the vapour phase). Metals and their compounds and materials in suspension are the main pollutants emitted to water. The metals concerned are Zn, Cd, Pb, Hg, Se, Cu, Ni, As, Co and Cr. Other significant substances are fluorides, chlorides and sulphates. Wastewater from the gas cleaning of the smelter and fluid-bed roasting stages are the most important sources. References: Sutherland C. A., Milner E. F., Kerby R. C., Teindl H. and Melin A. (1997) Lead. In: Ullmann's encyclopedia of industrial chemistry (ed. Anonymous). 5th edition on CD-ROM Edition. Wiley & Sons, London. IPPC (2001) Integrated Pollution Prevention and Control (IPPC); Reference Document on Best Available Techniques in the Non Ferrous Metals Industries. European Commission. Retrieved from http://www.jrc.es/pub/english.cgi/ 0/733169 technologyComment of primary zinc production from concentrate (RoW): The technological representativeness of this dataset is considered to be high as smelting methods for zinc are consistent in all regions. Refined zinc produced pyro-metallurgically represents less than 5% of global zinc production and less than 2% of this dataset. Electrometallurgical Smelting The main unit processes for electrometallurgical zinc smelting are roasting, leaching, purification, electrolysis, and melting. In both electrometallurgical and pyro-metallurgical zinc production routes, the first step is to remove the sulfur from the concentrate. Roasting or sintering achieves this. The concentrate is heated in a furnace with operating temperature above 900 °C (exothermic, autogenous process) to convert the zinc sulfide to calcine (zinc oxide). Simultaneously, sulfur reacts with oxygen to produce sulfur dioxide, which is subsequently converted to sulfuric acid in acid plants, usually located with zinc-smelting facilities. During the leaching process, the calcine is dissolved in dilute sulfuric acid solution (re-circulated back from the electrolysis cells) to produce aqueous zinc sulfate solution. The iron impurities dissolve as well and are precipitated out as jarosite or goethite in the presence of calcine and possibly ammonia. Jarosite and goethite are usually disposed of in tailing ponds. Adding zinc dust to the zinc sulfate solution facilitates purification. The purification of leachate leads to precipitation of cadmium, copper, and cobalt as metals. In electrolysis, the purified solution is electrolyzed between lead alloy anodes and aluminum cathodes. The high-purity zinc deposited on aluminum cathodes is stripped off, dried, melted, and cast into SHG zinc ingots (99.99 % zinc). Pyro-metallurgical Smelting The pyro-metallurgical smelting process is based on the reduction of zinc and lead oxides into metal with carbon in an imperial smelting furnace. The sinter, along with pre-heated coke, is charged from the top of the furnace and injected from below with pre-heated air. This ensures that temperature in the center of the furnace remains in the range of 1000-1500 °C. The coke is converted to carbon monoxide, and zinc and lead oxides are reduced to metallic zinc and lead. The liquid lead bullion is collected at the bottom of the furnace along with other metal impurities (copper, silver, and gold). Zinc in vapor form is collected from the top of the furnace along with other gases. Zinc vapor is then condensed into liquid zinc. The lead and cadmium impurities in zinc bullion are removed through a distillation process. The imperial smelting process is an energy-intensive process and produces zinc of lower purity than the electrometallurgical process. technologyComment of treatment of electronics scrap, metals recovery in copper smelter (SE, RoW): Conversion of Copper in a Kaldo Converter and treatment in converter aisle. technologyComment of treatment of scrap lead acid battery, remelting (RoW): The referred operation uses a shaft furnace with post combustion, which is the usual technology for secondary smelters. technologyComment of treatment of scrap lead acid battery, remelting (RER): The referred operation uses a shaft furnace with post combustion, which is the usual technology for secondary smelters. Typically this technology produces 5000 t / a sulphuric acid (15% concentration), 25’000 t lead bullion (98% Pb), 1200 t / a slags (1% Pb) and 3000 t / a raw lead matte (10% Pb) to be shipped to primary smelters. Overall Pb yield is typically 98.8% at the plant level and 99.8% after reworking the matte. The operation treats junk batteries and plates but also lead cable sheathing, drosses and sludges, leaded glass and balancing weights. From this feed it manufactures mainly antimonial lead up to 10% Sb, calcium-aluminium lead alloys with or without tin and soft lead with low and high copper content. All these products are the result of a refining and alloying step to meet the compliance with the designations desired. The following by products are reused in the process: fine dust, slag, and sulfuric acid. References: Quirijnen L. (1999) How to implement efficient local lead-acid battery recycling. In: Journal of Power Sources, 78(1-2), pp. 267-269.
The referred operation uses a shaft furnace with post combustion, which is the usual technology for secondary smelters. Typically this technology produces 5000 t / a sulphuric acid (15% concentration), 25’000 t lead bullion (98% Pb), 1200 t / a slags (1% Pb) and 3000 t / a raw lead matte (10% Pb) to be shipped to primary smelters. Overall Pb yield is typically 98.8% at the plant level and 99.8% after reworking the matte. The operation treats junk batteries and plates but also lead cable sheathing, drosses and sludges, leaded glass and balancing weights. From this feed it manufactures mainly antimonial lead up to 10% Sb, calcium-aluminium lead alloys with or without tin and soft lead with low and high copper content. All these products are the result of a refining and alloying step to meet the compliance with the designations desired. The following by products are reused in the process: fine dust, slag, and sulfuric acid. References: Quirijnen L. (1999) How to implement efficient local lead-acid battery recycling. In: Journal of Power Sources, 78(1-2), pp. 267-269.
Das Projekt "Aufbereitung von Hochofengichtschlaemmen (zur Darstellung von Kohlenstoff, Blei, Zink und einem Fe-Produkt)" wird vom Umweltbundesamt gefördert und von Studiengesellschaft für Eisenerzaufbereitung durchgeführt. In der BRD fallen bei einer Roheisenproduktion von 35 Mio. Jato etwa 2000000t Gichtschlaemme an mit 20 - 40 Prozent Fe, 20 - 35 Prozent Kohlenstoff, 3 - 7 Prozent Blei und Zink. Sowohl der Kohlenstoff als auch die Metalle sind Wertstofftraeger, koennen aber nur getrennt verarbeitet werden. Fuer die Rueckfuehrung im Eisenhuettenbereich liegen die Blei-/Zink-Gehalte zu hoch und fuer den Einsatz in einer Metallhuette zu niedrig. Die Schlaemme koennen z.Zt. nur deponiert werden, wobei fast nur noch Sonderdeponien zugelassen sind. In Versuchen zur Wertstofftrennung konnte ueber Flotation ein Kohlenstoff-Produkt mit ueber 80 Prozent C-Gehalt bei hohem Ausbringen erreicht werden. Ueber eine anschliessende Magnetscheidung ist dann weiter in ein Fe- und Pb-/Zn-Produkt zu trennen. Aufgaben des vorliegenden F+E-Vorhabens sind Untersuchungen zur Erfassung der Mineralphasen und der Elementverteilung und die Optimierung der Aufbereitung bis hin zur Darstellung eines Verfahrens im Pilotmassstab.
Das Projekt "Vorfuehrung eines energiesparenden Verfahrens zum Schmelzen von Blei" wird vom Umweltbundesamt gefördert und von Berzelius durchgeführt. Objective: To modify an existing QSL reactor to enable the demonstration of the energy-saving, low-pollution process. This requires operating the unit on a continuous basis -vs. the current batch-operation - for 6 months and then switching to cheaper feedstock for an other 6 months. General Information: In the 30,000 TPY QSL-plant of the Berzelius company, initial tests were run to show that it can be operated with an energy-saving of approximately 50 per cent, using lower-value feedstock while reducing SO2 and dust emissions by over 80 per cent The key of the QSL process is that it is a one-step process - compared to two steps in conventional lead-smelting - taking place in one single reactor. This enables the reduction of SO2 emissions by some 93 per cent and dust by 80 per cent. The lead-concentrate (feed) is mixed with fluxes, water and recycled flue dust in a mixer and is then pelletised into so-called green pellets which are kept wet to avoid dusting problems. They are fed into the reactor which is separated into an oxidation and a reduction zone. In the oxidation zone oxygen is blown in to oxidise the lead sulfides to metallic lead and high-lead slag. The high-lead slag passes into the reduction zone, which is separated from the oxidation zone by a weir. Pulverized coal and air or oxygen are blown into the reduction zone from the bottom. The coal reduces the lead oxide contained in the slag to metallic lead, which recombines with the primary lead from the oxidation zone before being tapped. The reduced low-lead slag leaves the reactor via an overflow and is either granulated or processed to recover the zone. The SO2-containing off-gas leaves the oxidation zone of the reactor at appr. 1100 deg. C. It is cooled to less than 800 deg. C. in a vertical uptake before passing to a waste heat boiler, an electro-filter and a sulfuric acid plant. The remaining flue dusts go back to the above mixer. To confirm the initial tests, the reactor needs to operate continuously for 6 months (Phase I) after which the feedstock will be switched to cheaper sulfur-containing coal and waste-fuels such as Petroleum coke (Phase II). The cost of the project is DM 10,9 million of which approximately DM 5 million covers Phase I. The benefit of the project is an estimated 30-35 per cent reduction in both investment and operating costs i.e., for a 100,000 TPY lead smelter the investment is approximately DM 150 million for a conventional plant vs. DM 100 million for a QSL-plant and the energy saving equivalent to 10.4 TOE. Patent coverage exists through 5 different patents. Achievements: The object of the project supported by the European Community was the demonstration that the QSL process exhibits only 50 per cent of the energy consumption required in conventional lead smelting. The target of the test as described was reached almost completely with the demonstration plant over a test period of considerable duration. In addition, success was also attained in replacing..
Das Projekt "Gas- und Staubimmission und dadurch verursachte Schaeden an Pflanzen und Tieren im Raume Nordenham" wird vom Umweltbundesamt gefördert und von Landwirtschaftskammer Weser-Ems durchgeführt. In der Nachbarschaft einer Blei- und Zinkhuette soll in einem dreijaehrigen Tierversuch mit Schafen und Kaninchen die Schadwirkung der pulmonalen Belastung mit Schadstoffen (SO2, NOx, HF, NH3, Pb, Cd, Zn) im Vergleich zur Belastung durch orale Aufnahme untersucht werden. Eine solche Information hat grundsaetzliche Bedeutung, um sinnvolle Vorbeugungsmassnahmen einleiten zu koennen.
Das Projekt "Emissionsminderung in einer Zinn-/Blei-Huette" wird vom Umweltbundesamt gefördert und von Metallhüttenwerke Bruch durchgeführt.
Das Projekt "Ermittlung von Zink- und Bleiimmissionsbelastung in der Umgebung von Blei- und Zinkhuetten" wird vom Umweltbundesamt gefördert und von Landesanstalt für Immissionsschutz Nordrhein-Westfalen durchgeführt.
Das Projekt "Bodenbelastung des Oberharzes im Bereich der Bleihuette - Gehalte und Verfuegbarkeit von Schwermetallen (As, Cu, Pb, Zn)" wird vom Umweltbundesamt gefördert und von Technische Universität Braunschweig, Institut für Geowissenschaften, Abteilung Geochemie durchgeführt. Die hohe Belastung an Schwermetallen von Boeden und Flusssedimenten des Harzes und im noerdlichen Harzvorland ist seit langem bekannt. Mittels vergleichender geochemischer Kartierungen (Diplomarbeiten) wurden 'normal' belastete besonders hoch kontaminierten Gebieten gegenuebergestellt. Sie liegen ueberwiegend im Bereich der Innerste. Besonders hoch belastet sind einerseits die Waldboeden in der Umgebung ehemaliger Verhuettungsplaetze, andererseits die Flusssedimente der Innerste bis weit in das noerdliche Harzvorland hinaus (Hildesheim). Im Bereich des Harzes liegen im Umfeld der Bleihuette bei Clausthal-Zellerfeld die maximalen Konzentrationen in Waldboeden bei 6 Prozent Blei, 4 Prozent Zink, 0.2 Prozent Kupfer und 350 ppm Cadmium (mittlere Konzentrationen: 1.1 Prozent, 0.7 Prozent, 0.05 Prozent, 40 ppm). Wesentlicher an absoluten Gehalten von Schwermetallen in Boeden und Sedimenten ist jedoch deren 'Verfuegbarkeit', wobei hierunter die mehr oder weniger leichte Loeslichkeit der Elementgehalte zu verstehen ist. Die Loeslichkeit haengt ab von der Art der Mineralisierung der Elemente (z.B. karbonatisch, silikatisch, oxidisch). Somit ist als entscheidendes Mass fuer das Gefaehrdungspotential durch die Schwermetallkonzentrationen die Elementspeziation zu ermitteln. Ausgehend von Laugungsversuchen und thermodynamischen Berechnungen koennen Szenarien und Prognosen zur Freisetzung der Schwermetalle entwickelt werden. Die Ergebnisse der Untersuchungen zur Elementspeziation von Pb, As, Zn und Cu sind den nachfolgend aufgefuehrten Publikationen zu entnehmen. Da die Erzverhuettung ueber viele Jahrhunderte betrieben wurde und die Verhuettungstechnologie in den frueheren Zeiten recht primitiv war, ist an vielen Plaetzen im Harz mit aehnlichen Kontaminationsmustern zu re chnen, wie sie im Umfeld der Bleihuette beobachtet werden.
Das Projekt "Schwermetalle in ufernahen Sedimenten und Boeden des Weser-Aestuars" wird vom Umweltbundesamt gefördert und von Universität Oldenburg durchgeführt. Da bisher nur die landwirtschaftlich genutzten Flaechen im Bereich der Bleihuette Nordenham auf Schwermetallbelastung untersucht worden sind, sollen Untersuchungen ueber Art und Ausmass der Schwermetallbelastung in ufernahen Sedimenten und Boeden des Wesermuendungsgebietes durchgefuehrt werden. Hierbei geht es nicht nur um moegliche Emissionen der Bleihuette Nordenham, sondern generell um die Belastung aus kommunalen und industriellen Abwaessern sowie durch den Schiffahrtsverkehr.