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Table 1 Total cost of the recycling supernatant for KFeS2 synthesis from cold-rolling sludge

From: Low-temperature conversion of Fe-rich sludge to KFeS2 whisker: a new flocculant synthesis from laboratory scale to pilot scale

  Reagent and processing Cost Usage Subtotal cost (USD t− 1)
Recycling of used alkaline solution for KFeS2 synthesis Fe-bearing sludge 0 0.86 t 0
Supplementary Potassium sulphide 673.3 USD t−1 1.38 t 929.15
Supplementary Potassium hydroxide 432.5 USD t−1 0.34 t 147.05
Tap water 0.28 t−1 3.1 t 0.86
Pulping 0.21 USD/kWh 0.5 kW (total 1 h) 0.11
Hydrothermal reaction 0.21 USD/kWh 30 kW (total 24 h) 151.2
Drying 0.21 USD/kWh 6 kW (total 20 h) 25.2
Total cost 1253.57