Synthesis of bimetallic Cu/Fe using fluidized-bed crystallization

Abstract

This study aims to recover copper from synthetic wastewater and produce Cu / Fe bimetallic material at the same time by fluidized-bed crystallization(FBC) technology The FBC technology can solve the flaws of chemical precipitation method which produce high water content sludge and recover the poorly soluble salt or oxide crystal particles with low water content from wastewater In this study ferrous phosphate and ND3 (?-FeOOH) particles from factories’ products were used as seeds and sodium bicarbonate was used as precipitant Under optimum operating conditions ([Cu]in = 209 ppm pHe = 8 63 [CO3] / [Cu] = 1 21 HRT = 10 9 min LCu = 0 57 kg / m2·hr Fe3(PO4)2 diameters = 1 00 - 1 41 mm static bed height = 30 cm floating bed height = 45 cm) copper crystallization rate (CR) and total removal rate (TR) could reach 93 1 % and 99 7 % respectively The outflow soluble copper concentration ([Cu]s) could drop to 0 353 ppm Besides with the feed concentration [Cu]in = 400 ± 10 ppm both of the two iron-containing particles operated for 240 minutes under the corresponding optimum conditions could reach up to 7 36 mg-Cu / g-seeds Finally the SEM analysis results showed different crystal structures of the inside and outside of the product particles The XRD analysis of the crystal particles showed an amorphous phase of basic copper carbonate (Cu2(OH)2CO3) EDS and Mapping analysis showed that the copper salt was coated on the carriers successfully

Date of Award	2019
Original language	English
Supervisor	Yao-Hui Huang (Supervisor)