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7.3.4 Experimental Data Analysis In this study, minus 149 μm particles were likely to have spherical geometries; whereas the particles larger than 149 μm were considered to be flat. Based on the size distribution in Fig. 4.2, approximately 15% of the shredded waste printed circuit boards are smaller than 149 μm; while approximately 85% of the boards are larger than 149 μm. Therefore, after considering the distribution of two geometries, Eq. 7.21, 7.24, 7.30, and 7.34 can be modified to t/tc = 1- {0.15(1 - XAu)}2/3 t/tc = 1- {0.15(1 – XAu)}1/3 t/tc = 0.85XAu t/tc = 0.85XAu The calculated gold extraction from a selected kinetic test was substituted into Eq. 7.35, 7.36, 7.37, and 7.38 for each of the possible controlling mechanisms as shown in Table 7.2. Based on the data presented in Table 7.2, the values of t/tc were plotted as a function of time shown in Fig. 7.10. It appears that R-squared values for chemical control are relatively higher than fluid control for spherical particles. Moreover, the calculated data shows that the fluid film diffusion controlling is still responsible for the bromide leaching of gold. The mechanism is complex with both a chemical controlling and fluid film diffusion controlling. This could be explained as follows: 1. Waste printed circuit boards are heterogeneous, leading to other metallic elements reacting with bromine and also possibly reacting with gold ions. Thus, the mechanism of gold dissolution in the bromine system becomes more complex. 2. The diverse presence of gold in the waste printed circuit boards (coating on board surfaces or gold particles in the waste printed circuit boards) also lead to the difference of the leaching mechanisms. 3. The metals that are more active than gold may reduce gold from gold-bromine complex ions to gold metal, which may further change the leaching mechanism. 4. There is also a possibility of a mechanism change as the leaching proceeds. 5. In terms of the chemical reaction, three steps may be involved: 1) Adsorption of bromine and bromide on the gold surface to form AuBr2- (Pesic et al., 1993), 2) Disproportion of AuBr2- to produce a stable species, AuBr4-, 3) Copper cementation to reduce AuBr4- to Au0. 102 (7.35) (7.36) (7.37) (7.38)PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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