by Junko Gammon
This phenomenon is not shocking for the reason that underlying metallurgical processes produce large quantities of low-worth metals corresponding to copper and silver (see Fig. i below Section b of the complement). As we encounter multi-output processes here, we need to apply allocations (see Section 2). Because only one refinery is processing these scraps and since the refinery information are confidential, we agreed to publish solely the information allotted for the product output of the prepared low-worth scraps (lv). Figure 5 compares the overall impact outcomes of the three influence categories land use, HumToxCan, and GWP of the gate-to-gate inventories of case B (see Section 3.1), divided into the 5 completely different materials types chemicals, electricity, natural gas production, and combustion as well as tap water per 1 kg Au. Because these knowledge weren’t process-specific and because it was concluded from the internal discussions that water shouldn’t be internally circulated, it was assumed that the amount of wastewater is equal to the input mass of auxiliary supplies (e.g., chemicals) plus the non-helpful scrap fraction (see Table 1). The first process information for this process were scaled down to the per-quantity-of-wastewater-basis (ww) and then extrapolated utilizing the aforementioned wastewater amount.
The materials required for a number of processes, comparable to electricity, usually are not duplicated incorrectly. Table 1 shows the info of the granulation of all scrap inputs, particularly, the excessive-worth scraps (e.g., jewelry and coins), the low-worth scraps subjected to numerous electrolysis processes, and the incinerated sweepings. A more detailed analysis reveals that a large a part of the totally different outcomes comes from the preparation of low-worth scraps. The aggregated inventory for the electrolytic preparation of the totally different low-value scraps is supplied in Table 1. The fabric designation “wastewater, internal” implies that this wastewater enters the internal wastewater therapy unit and is circuitously piped into the municipal sewage system. Further information on the abbreviations of the influence categories and their related units may be found in the Supplementary material Section c. A comparability of the influence results of gold scrap recycling obtained within the context of this research as offered in Fig. 4, with the abovementioned ecoinvent v.3.5 LCA datasets on the gold price from WEEE recycling and mining, is proven in Fig. 6. For this evaluation, the mannequin with allocation by the monetary value was chosen as a result of, on the one hand, this method is the allocation technique used in the ecoinvent v.3.5 datasets, and alternatively, this mannequin leads to worse impacts, and with a conservative analysis we do not run the risk of optimistically representing the examine outcomes.
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