Description: technologyComment of magnesium sulfate production (RER, RoW): Data approximated with data from lime mining, crushing and milling. technologyComment of rare earth oxides production, from rare earth oxide concentrate, 50% REO (CN-NM): At first, the 50% REO concentrate undergoes acid roasting, where it is heated to 550 °C with the addition of 93% sulfuric acid to produce rare earth sulfates (approximatelly 50% RE sulfate present). In the following water leaching & chlorine conversion process, the produced RE sulfates are leached and converted to 92% mixed RE chlorides, with a conversion efficiency of 97%. Afterwards, solvent extraction is applied to the mixed RE chlo-rides by mixing them with an organic extractant such as di(2-ethylhexyl) phosphoric acid, with the small differences in basicity of the different RE metals serving as the driving agent of the separation process. The products of the solvent extraction process are aqueous solutions of individual RE ions high purity (99%). The generated RE ions are then precipitated in the aqueous solutions to produce RE carbonates. Calcination of the RE carbonates at 750−800 °C with natural gas as the heat source is the final step to form the individual REOs (lanthanum oxide, cerium oxide, neodymium oxide and a mixed samarium-europium gadolinium concentrate).
Types:
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Comment: This is a market activity. Each market represents the consumption mix of a product in a given geography, connecting suppliers with consumers of the same product in the same geographical area. Markets group the producers and also the imports of the product (if relevant) within the same geographical area. They also account for transport to the consumer and for the losses during that process, when relevant. This is the market for 'magnesium sulfate', in the Global geography. Transport from producers to consumers of this product in the geography covered by the market is included. 'magnesium sulfate' is an inorganic substance with a CAS no. : 007487-88-9. It is called 'magnesium sulfate' under IUPAC naming and its molecular formula is: MgSO4. It is solid under normal conditions of temperature and pressure and appears as a crystalline solid. It is modelled as a pure substance. On a consumer level, is used in the following products: fertilisers, cosmetics and personal care products, adhesives and sealants, inks and toners and pharmaceuticals. On industrial sites, the substance is used for the manufacture of products in the following sectors: pulp, paper and paper products, chemicals, textile, leather or fur and plastic products. This market is supplied by the following activities with the given share: rare earth oxides production, from rare earth oxide concentrate, 50% REO, CN-NM: 0.999999696899691 magnesium sulfate production, RER: 1.00202644000618e-07 magnesium sulfate production, RoW: 2.02897665198143e-07 generalComment of magnesium sulfate production (RER, RoW): The functional unit represent 1 kg of magnesium sulphate. Large uncertainty of the process data due to weak data on the production process. [This dataset was already contained in the ecoinvent database version 2. It was not individually updated during the transfer to ecoinvent version 3. Life Cycle Impact Assessment results may still have changed, as they are affected by changes in the supply chain, i.e. in other datasets. This dataset was generated following the ecoinvent quality guidelines for version 2. It may have been subject to central changes described in the ecoinvent version 3 change report (http://www.ecoinvent.org/database/ecoinvent-version-3/reports-of-changes/), and the results of the central updates were reviewed extensively. The changes added e.g. consistent water flows and other information throughout the database. The documentation of this dataset can be found in the ecoinvent reports of version 2, which are still available via the ecoinvent website. The change report linked above covers all central changes that were made during the conversion process.] generalComment of rare earth oxides production, from rare earth oxide concentrate, 50% REO (CN-NM): This dataset refers to the extraction and refining processes applied on the produced REO concentrate, 50% beneficiated (as a byproduct of the mining and beneficiation activities in Bayan obo mines) in order to produce high purity individual lanthanum oxide, cerium oxide, neodymium oxide and a mixed samarium-europium gadolinium concentrate. The extraction and refining activities take place in a processing facility in the Baotou region of Inner Mongolia and include acid roasting, water leaching and chloride conversion, solvent extraction and calcination. Background: Metals are produced as part of a complex, highly interconnected and interdependent system, with many desirable but scarce/critical metals recovered as by-products during the production of one or more ‘host’ metal(s). Iron is one of the world’s major mineral commodities and is mined from heterogeneous mineral deposits in countries worldwide. In various deposits in China, iron co-occurs with minerals containing rare earth elements, particularly bastnäsite and/or monazite. Through the separation and processing of these minerals, rare earth oxides are produced. Modelling approach: This dataset was created using the critical materials life cycle assessment tool (CMLCAT) of Arshi et al. (2018).
Origin: /Bund/UBA/ProBas
Tags: Magnesiumsulfat ? Erdgas ? Carbonat ? Cerdioxid ? Gadolinium ? Neodym ? Lösungsmittel ? Lanthan ? Kalkung ? Kalzinierung ? Organische Säure ? Schwefelsäureherstellung ? Seltene Erden ? Basizität ? Daten ? Ionen ? Wasser ? Mining and quarrying ? Mining of metal ores ? Mining of non-ferrous metal ores ? Mining of other non-ferrous metal ores ?
License: unbekannt
Language: Deutsch
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