Dolomite-apatite separation by amphoteric collector in presence of bacteria
来源期刊：中南大学学报(英文版)2013年第6期
论文作者：Elmahdy Ahmed El-Mofty Salah Abdel-Khalek Mohamed Abdel-Khalek Nagui El-MidanyAyman
文章页码：1645 - 1652
Key words：dolomite; phosphate; amphoteric collector; bacteria; bio-flotation; carbonate minerals
Abstract: Bioflotation represents one of the growing trends to enhance the selectivity of conventional flotation processes. It utilizes the micro-organisms to replace or to interact with the chemical reagents to increase the gap between surface properties of similar minerals and to enhance the separation selectivity. In this work, dolomite-phosphate separation was investigated using amphoteric collector (dodecyl-N-carboxyethyl-N-hyroxyethyl-imidazoline) in presence of bacteria. Two types of bacteria, Corynebacterium- diphtheriae-intermedius (CDI), and Pseudomonas aeruginosa (PA), were used. The collector-bacteria interaction was characterized by Fourier transform infra-red (FTIR), frothing height and Zeta potential. The results show that the collector-bacteria interaction improves the flotation selectivity. Although, the PA positively affects the separation results, the CDI cannot lower the MgO to less than 1%. A phosphate content of 0.7% MgO and 31.77% P2O5 with a recovery of 68% at pH 11, 3.0 kg/t amphoteric collector, 4×107 cells of PA is obtained.
Elmahdy Ahmed1, El-Mofty Salah2, Abdel-Khalek Mohamed1, Abdel-Khalek Nagui1, El-MidanyAyman2
(1. Central Metallurgical Research and Development Institute, Cairo 11421, Egypt;2. Mining, Petroleum and Metallurgical Engineering Department, Cairo University, Cairo 11632, Egypt)
Abstract:Bioflotation represents one of the growing trends to enhance the selectivity of conventional flotation processes. It utilizes the micro-organisms to replace or to interact with the chemical reagents to increase the gap between surface properties of similar minerals and to enhance the separation selectivity. In this work, dolomite-phosphate separation was investigated using amphoteric collector (dodecyl-N-carboxyethyl-N-hyroxyethyl-imidazoline) in presence of bacteria. Two types of bacteria, Corynebacterium- diphtheriae-intermedius (CDI), and Pseudomonas aeruginosa (PA), were used. The collector-bacteria interaction was characterized by Fourier transform infra-red (FTIR), frothing height and Zeta potential. The results show that the collector-bacteria interaction improves the flotation selectivity. Although, the PA positively affects the separation results, the CDI cannot lower the MgO to less than 1%. A phosphate content of 0.7% MgO and 31.77% P2O5 with a recovery of 68% at pH 11, 3.0 kg/t amphoteric collector, 4×107 cells of PA is obtained.
Key words:dolomite; phosphate; amphoteric collector; bacteria; bio-flotation; carbonate minerals
