zinc sulfide production, UPR, ecoinvent 3.6, Allocation, cut-off

Categories:
ISIC4 categories:
C:Manufacturing/20:Manufacture of chemicals and chemical products/201:Manufacture of basic chemicals, fertilizers and nitrogen compounds, plastics and synthetic rubber in primary forms/2011:Manufacture of basic chemicals
Location:
RoW - Rest of World
Reference year: 2005 - 2020
Description

Reference product: sulfuric acid [kg]
Location: RoW - Rest-of-World
This dataset represents the production of 1 kg of solid zinc sulfide powder. Zinc sulfide (ZnS) is a white to yellow coloured powder or crystal. Zinc sulfide can be used as a pigment (sachtolith), mainly in plastics and paints. With addition of a few ppm of a suitable activator, ZnS is also used as a phosphor in many applications, from cathode ray tubes through x-ray screens to glow-in-the-dark products. Copper doped zinc sulfide (ZnS:Cu) is used in electroluminescent panels. Zinc sulfide is also used as an infrared optical material, transmitting from visible wavelengths to over 12 micrometres.
In this dataset, the raw material inputs are calculated according to stoichiometry and the emissions to air and water are estimated using mass balance. Therefore, this dataset represents an estimation of the production process and should be used only for processes where the impact of zinc sulfide is not considered to be high. The energy and water values are approximated based on data from a large chemical plant (Gendorf 2016).
References:
Hischier R., Classen M., Lehmann M. and Scharnhorst W. (2007) Life cycle inventories of Electric and Electronic Equipment: Production, Use and Disposal. ecoinvent report No. 18. Empa / Technology & Society Lab, Swiss Centre for Life Cycle Inventories, Dübendorf, 2007.
Gendorf (2016) Umwelterklärung 2015, Werk Gendorf Industriepark, www.gendorf.de.
[This dataset has been generated using the system model "Allocation, cut-off by classification". A system model describes how activity datasets are linked to form product systems. The allocation cut-off system model subdivides multi-product activities by allocation, based on a physical properties, economic, mass or other properties. By-products of waste treatment processes are cut-off, as are all by-products classified as recyclable. Markets in this model include all activities in proportion to their current production volume.
Version 3 of the ecoinvent database offers three system models to choose from. For more information, please visit: https://www.ecoinvent.org/database/system-models-in-ecoinvent-3/system-…)]

Technology

Production from zinc monosulfate and sodium sulfide, assuming a yield of 100%. Zinc sulphide is produced by precipitation out of a solution according to the following stoechiometric equation:
ZnSO4.H2O + Na2S -> ZnS + Na2SO4 + H2O

Process type
Unit
Supported nomenclature
ecoinvent 3.6
LCI modeling approach
Attributional
Multifunctional modeling
ECONOMIC
Format
ECOSPOLD2
Aggregation type
NOT_APPLICABLE
Data provider
ecoinvent
Review status
External
Cost
For sale
License

ecoinvent EULA