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Thus, the whole process for waste printed circuit boards entails battery and aluminum heat sink removal, shredding and leaching of waste printed circuit boards, and performing solid/liquid separation by filtering, followed by further recovery and purification for the metals of interest as shown in Fig. 8.1. Table 8.1 Elemental composition of leaching residues from the triplicate leaching Element Ni (%) Cu (%) Zn (%) Sn (%) Pb (%) Pd (ppm) Ag (ppm) Au (ppm) 8.2 Preliminary Economic Analysis Average content 0.028 0.620 0.263 0.145 0.050 3.772 0.028 0.009 Standard Deviation 0.009 0.031 0.061 0.016 0.007 3.599 0.009 0.004 The key assumptions used in the preliminary economic feasibility are as follows: 1. The model is based on a 3,500 tonnes per year (10 tonnes per day) throughput rate. 2. The capital costs for the entire process are estimated using Mular’s “Factored Capital Cost Estimate Guide”. 3. Waste printed circuit boards are purchased at an average rate of $4.4/kg. 4. The operating schedule is assumed to be 24 hours per day and 7 days per week for 350 days per year. 5. In the leaching circuit, the pulp density is assumed to be 45%. 6. Prior to the solvent extraction for base metals, iron removal is carried out. 7. The average specific gravity of waste printed circuit boards is assumed to be 2.5g/cm3. 8. The operating parameters for iron free solvent extraction is shown in Table G1. 106PDF Image | HYDROMETALLURGICAL TREATMENT OF E-SCRAP
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