scholarly journals Iron Recovery from Discarded Copper Slag in a RHF Direct Reduction and Subsequent Grinding/Magnetic Separation Process

Minerals ◽  
2016 ◽  
Vol 6 (4) ◽  
pp. 119 ◽  
Author(s):  
Zhicheng Cao ◽  
Tichang Sun ◽  
Xun Xue ◽  
Zhanhua Liu
Keyword(s):  
Magnetic Separation ◽  
Direct Reduction ◽  
Copper Slag ◽  
Separation Process ◽  
Iron Recovery

Synergetic utilization of copper slag and ferruginous manganese ore via co-reduction followed by magnetic separation process

2020 ◽  
Vol 250 ◽  
pp. 119462 ◽  
Author(s):  
Deqing Zhu ◽  
Jiwei Xu ◽  
Zhengqi Guo ◽  
Jian Pan ◽  
Siwei Li ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Copper Slag ◽  
Separation Process ◽  
Manganese Ore ◽  
Co Reduction

Optimization of magnetic separation process for iron recovery from steel slag

2017 ◽  
Vol 24 (2) ◽  
pp. 165-170 ◽  
Author(s):  
Yuan-pei Lan ◽  
Qing-cai Liu ◽  
Fei Meng ◽  
De-liang Niu ◽  
Heng Zhao
Keyword(s):  
Magnetic Separation ◽  
Steel Slag ◽  
Separation Process ◽  
Iron Recovery

scholarly journals Recovery of iron and phosphorus removal from Gara Djebilet iron ore (Algeria)

2021 ◽  
pp. 82-88
Author(s):  
F.A Mansour ◽  
M Ould-Hamou ◽  
A Merchichi ◽  
O Gven
Keyword(s):  
Magnetic Separation ◽  
Sodium Sulfate ◽  
Phosphorus Removal ◽  
Recovery Rate ◽  
Iron Ore ◽  
Direct Reduction ◽  
Phase Changes ◽  
Iron Recovery ◽  
Effects Of Temperature ◽  
Oolitic Iron Ore

Purpose. This research aims to promote the assay of iron and reduce the phosphorus grade of the final DRI. Methodology. A high-phosphorus oolitic iron ore from Gara Djebilet deposit underwent the procedure of coal-based direct reduction (coal-based DR) followed by wet low-intensity magnetic separation (WLIMS). The effects of temperature, periods of time and Na2SO4 dosage on phosphorus removal, metallisation degree and iron recovery rate were tried and optimised. Furthermore, phase changes in iron oxides and the distributing features of phosphorus in both reduced and magnetic materials were investigated as well. Findings. The appropriate addition of sodium sulfate improves the Fe-P separation during the coal-based DR of Gara Djebilet mixed pellets. Originality. Using additives of CaO and sodium sulfate during the coal-based DR-magnetic separation of mixed pellets sourced from Gara Djebilet deposit. Practical value. The results reveal that a final direct reduced powder (DRI) assaying 96 wt% Fe and 0.16 wt% P at a recovery rate of 97.72% was obtained when the ore-coal-CaO mixed pellets were reduced in the presence of 5 wt% Na2SO4 at 1250 C for 30 min. Thus, the coal-based DR could be used as an alternative to the blast furnace (BF) route in the steelmaking industry from refractory iron ores.

scholarly journals Recovering Iron from Iron Ore Tailings and Preparing Concrete Composite Admixtures

Minerals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 232 ◽  
Author(s):  
Chang Tang ◽  
Keqing Li ◽  
Wen Ni ◽  
Duncheng Fan
Keyword(s):  
Magnetic Separation ◽  
Iron Ore ◽  
Direct Reduction ◽  
Mineral Admixtures ◽  
Iron Recovery ◽  
Slag Powder ◽  
Highly Active ◽  
Iron Ore Tailings ◽  
High Silica ◽  
Iron Grade

Iron ore tailings (IOTs) are a form of solid waste produced during the beneficiation process of iron ore concentrate. In this paper, iron recovery from IOTs was studied at different points during a process involving pre-concentration followed by direct reduction and magnetic separation. Then, slag-tailing concrete composite admixtures were prepared from high-silica residues. Based on the analyses of the chemical composition and crystalline phases, a pre-concentration test was developed, and a pre-concentrated concentrate (PC) with an iron grade of 36.58 wt % and a total iron recovery of 83.86 wt % was obtained from a feed iron grade of 12.61 wt %. Furthermore, the influences of various parameters on iron recovery from PC through direct reduction and magnetic separation were investigated. The optimal parameters were found to be as follows: A roasting temperature of 1250 °C, a roasting time of 50 min, and a 17.5:7.5:12.5:100 ratio of bitumite/sodium carbonate/lime/PC. Under these conditions, the iron grade of the reduced iron powder was 92.30 wt %, and the iron recovery rate was 93.96 wt %. With respect to the original IOTs, the iron recovery was 78.79 wt %. Then, highly active slag-tailing concrete composite admixtures were prepared using the high-silica residues and S75 blast furnace slag powder. When the amount of high-silica residues replacing slag was 20%, the strength of cement mortar blocks at 7 days and 28 days was 33.11 MPa and 50 MPa, respectively, whereas the activity indices were 89 and 108, respectively. Meanwhile, the fluidity rate was appropriately 109. When the content of high-silica residues replacing slag was not more than 30%, the quality of mineral admixtures was not reduced. Last but not least, reusing the high-silica residues during iron recovery enabled the complete utilization of the IOTs.

The Study on Microwave Magnetic Roasting Plus Magnetic Seperation and Acid Pickling to Enrich Nb of Low-Grade Niobium Minerals

2012 ◽  
Vol 182-183 ◽  
pp. 17-22 ◽  
Author(s):  
Jie Li ◽  
Jun Wang ◽  
Bao Wei Li ◽  
Lei Wang
Keyword(s):  
Particle Size ◽  
Magnetic Separation ◽  
Separation Process ◽  
Low Grade ◽  
Iron Recovery ◽  
Separation Effect ◽  
Acid Pickling ◽  
Low Intensity ◽  
Separation Result ◽  
Iron Grade

In present article, the low intensity magnetic separation process was studied for the low-grade niobium minerals by microwave magnetic roasting. The influence of magnetic density, particle size of grinding and dispersant addition on the magnetic separation effect of sinter ore with the best magnetisability was investigated emphatically. The results show that the iron recovery was decreased and the iron grade increased gradually with decreasing the magnetic density and particle size of grinding. The magnetic separation result of sinter ore was optimal under the magnetic density of 80KA / m and the grinding grain-size of 33 μm. Fine grinding can effectively make Fe separated from Nb, especially when the dispersant(industrial alcohol) was used in the process of magnetic separation , resulting in the improvement of the grade of iron from 57.2% to 60.5% and enrichment of Nb in the tailing ore(the grade of Nb was 5.01%). After the acid pickling of tailing ore containing Nb, the grade of Nb in the extract was improved to 12.36%, which was enriched four times more than that of low-grade niobium ore before microwave magnetic roasting.

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