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Figure 6.20 Structure of DBDMH (a: 3D structure; b: 2D structure) (Pubchem, 2018) A study was first performed to investigate whether DBDMH itself was capable of dissolving gold in shredded waste printed circuit boards. Fig. 6.21 shows that only 27% of gold could be dissolved by DBDMH alone. The addition of NaBr considerably accelerated the initial gold dissolution rate. However, as the leaching proceeded, there was an increase of gold dissolution, followed by a decrease after 6 hours. It can be attributed to the fact that the presence of NaBr accelerates the dissolution of gold and silver, thus leading to a significant consumption of active bromine decomposed from DBDMH. The decrease of DBDMH concentration further results in a decrease of solution ORP values (shown in Table 6.3). Copper and other active metals are likely to reduce gold from gold-bromine complexes to gold, thus resulting in a significant loss of the gold. On the contrary, in the absence of NaBr, DMDBH is only capable of dissolving a small amount of silver by forming soluble species (silver-bromide complexes) given the shortage of bromide ions. Most of the silver is found as a precipitate of AgBr. The AgBr precipitates are likely to coat the gold surface and passivate the underlying alloy, preventing the gold dissolution (Sergent et al., 1987). Although the gold dissolution is low in the presence of DBDMH itself, there is no decrease of the gold dissolution due to the sufficient amount of free active bromine in the solution. Three concentrations of DBDMH (50g/L, 75g/L and 100g/L) were then investigated at room temperature and natural pH. It is necessary to point out that the initial solution pH in the presence of DBDMH was around 7, which was much higher than the pH value in the liquid 85PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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