Comprehensive Utilization of Ludwigite Iron Concentrate by Gas-based Direct Reduction

2017 ◽  
pp. 661-668
Author(s):  
Luxing Feng ◽  
Jun Deng ◽  
Xun Xue ◽  
Zhicheng Cao ◽  
Jingkun Tang ◽  
...  
Keyword(s):  
Direct Reduction ◽  
Comprehensive Utilization ◽  
Iron Concentrate

Fundamental Study on Application of Gas-Based Shaft Furnace Direct Reduction Process to High Efficiency and Clean Utilization of Paigeite

2011 ◽  
Vol 233-235 ◽  
pp. 753-758
Author(s):  
Zhao Cai Wang ◽  
Man Sheng Chu ◽  
Zhuang Nian Li ◽  
Jue Tang ◽  
Qing Jie Zhao ◽  
...  
Keyword(s):  
Electric Furnace ◽  
Shaft Furnace ◽  
Direct Reduction ◽  
Reduction Process ◽  
Technical Problems ◽  
Direct Reduction Process ◽  
Comprehensive Utilization ◽  
Iron Concentrate ◽  
New Process ◽  
Reduction Swelling

The paigeite resources are abundant in China, but most of them are difficult to be utilized efficiently because of the current technical problems on industrial practice. It is necessary to perfected and innovated for comprehensive utilization of paigeite. The new process of gas-based shaft furnace direct reduction-electric furnace smelting separation provides a new way to efficient and clean comprehensive utilization of paigeite resources. In this paper, the pellets are prepared from boron-bearing iron concentrate. The mechanisms of roasting, the rules of reduction, and the properties of reduction swelling are also investigated. And then the pellets after reduction are smelted and separated in electric furnace to study the properties of products and analyze the feasibility and superiority of new technique. The results showed that boron-bearing iron concentrate is a kind of good raw material for pelletizing process. The properties of boron-bearing pellets after roasting for 20 min at 1200°C could meet to the requirements of gas-based shaft furnace direct reduction process, which exhibited fast reaction rate, good reduction swelling properties and high compressive strength both before and after reduction. With the new process, the efficient separation of boron and iron can be realized. The high boron grade and high activity of boron-rich slag obtained from new process can be used directly in boric acid manufacture. The new process shows excellent tech-economy feasibility to achieve efficiency and clean comprehensive utilization of paigeite resources.

scholarly journals Carbothermal Reduction of Iron Ore in Its Concentrate-Agricultural Waste Pellets

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Zhulin Liu ◽  
Xuegong Bi ◽  
Zeping Gao ◽  
Wei Liu
Keyword(s):  
Carbothermal Reduction ◽  
Iron Ore ◽  
Loss Rate ◽  
Direct Reduction ◽  
Agricultural Waste ◽  
Weight Loss Rate ◽  
Iron Concentrate ◽  
High Speeds ◽  
Reduction Of Iron ◽  
Biomass Char

Carbon-containing pellets were prepared with the carbonized product of agricultural wastes and iron concentrate, and an experimental study on the direct reduction was carried out. The experimental results demonstrated that carbon-containing pellets could be rapidly reduced at 1200 to 1300°C in 15 minutes, and the proper holding time at high temperature was 15 to 20 min. The degree of reduction gradually increased with temperature rising, and the appropriate temperature of reducing pellets was 1200°C. The weight loss rate and reduction degree of pellets increased with the rise of carbon proportion, and the relatively reasonable mole ratio of carbon to oxygen was 0.9. A higher content of carbon and an appropriate content of volatile matters in biomass char were beneficial to the reduction of pellets. The carbon-containing pellets could be reduced at high speeds in the air, but there was some reoxidization phenomenon.

Direct Reduction Experiment on Low-Grade Limonite at JiangXi

2013 ◽  
Vol 734-737 ◽  
pp. 1029-1032 ◽  
Author(s):  
Jiang An Chen ◽  
Jun Liu
Keyword(s):  
Magnetic Separation ◽  
Direct Reduction ◽  
Influence Factors ◽  
Low Grade ◽  
Iron Concentrate ◽  
Reduction Experiment ◽  
Mesh Screen ◽  
Concentrate Grade ◽  
Roasting Time ◽  
Separation Conditions

Considered the properties of limonite ore at Jiangxi, the raw ore pressing ball - direct reduction - magnetic separation flowsheet have been adopted. the pressing ball conditions, the influence factors and the grinding magnetic separation conditions experiments were carried out. The results shown that: When the dosage of coal was 20%, water was 10%, CMC was 0.5%, pressing ball under the pressure of 190 kN, the calcination temperature was 1100 °C, the roasting time is 50 min, roasted ore were magnetic separated after grinded to 85% through 200 mesh screen. the iron concentrate grade of 92.48% and recovery rate of 93.45% were achieved finally.

The Comprehensive Utilization of Recovering Gold from Iron Tailings

2012 ◽  
Vol 622-623 ◽  
pp. 494-499
Author(s):  
Xiao Wang ◽  
Xiong Tong ◽  
Zheng Bin Deng ◽  
Yong Cheng Zhou ◽  
Xian Xie
Keyword(s):  
Magnetic Separation ◽  
Experimental Studies ◽  
Leaching Rate ◽  
Gold Dissolution ◽  
Comprehensive Utilization ◽  
Iron Concentrate ◽  
Comprehensive Recovery

In this study, the main aim was to recovery the gold from iron tailings, and comprehensive recovery of iron by using combined separating technology. Experimental studies were carried out on the iron tailings in Dahongshan samples, which contain 0.5g/t of gold and 16.8% of iron. Through the experiment, the first is pre-discarding tailings by centrifuge, and then the gold is recovered by cyanidation leaching with using of H2O2 to increase the rate of gold dissolution. The gold’s leaching rate can reach 97.60%. The qualified iron concentrate can be got from leaching slag and gravity tailings by magnetic separation. Iron tailings get a comprehensive utilization, which has a better effect.

Experimental Research on Low Grade Copper-Bearing Magnetite in one Area

2011 ◽  
Vol 347-353 ◽  
pp. 157-162
Author(s):  
Jun Liu ◽  
Jiang An Chen
Keyword(s):  
Magnetic Separation ◽  
Experimental Research ◽  
Low Grade ◽  
Research Subjects ◽  
Flotation Process ◽  
Valuable Metal ◽  
Comprehensive Utilization ◽  
Iron Concentrate ◽  
Low Intensity ◽  
National Resource

Recovering valuable metal from tailings has always been one of national resource comprehensive utilization key research subjects. There are copper-bearing magnetite which contains 43.31% of iron and 0.21% of copper in some places. After grinding-low intensity magnetic separation-flotation process can get 68.87% of iron concentrate with recovery 64.39% and copper concentrate which contain copper 12.67% with recovery of 75.30%. The experiment results will provide an effective way to comprehensive utilize the resource in one area.

Preparing high-purity iron by direct reduction‒smelting separation of ultra-high-grade iron concentrate

2020 ◽  
Vol 27 (4) ◽  
pp. 454-462
Author(s):  
Feng Li ◽  
Qing-jie Zhao ◽  
Man-sheng Chu ◽  
Jue Tang ◽  
Zheng-gen Liu ◽  
...  
Keyword(s):  
High Purity ◽  
Direct Reduction ◽  
High Grade ◽  
Iron Concentrate ◽  
Reduction Smelting ◽  
Purity Iron ◽  
High Purity Iron

Recovering of Iron from Feebly-Magnetic Iron Tailings Containing High Silicate

2013 ◽  
Vol 385-386 ◽  
pp. 30-33
Author(s):  
Xian Xie ◽  
Xiao Wang ◽  
Xiong Tong
Keyword(s):  
Magnetic Separation ◽  
High Frequency ◽  
Experimental Studies ◽  
Comprehensive Utilization ◽  
Iron Concentrate ◽  
High Silicate

In this study, the main aims were to recovery iron from iron tailings containing high silicate and reduce the tailing grade by using combined separating technology. Experimental studies were carried out on the iron tailings in Dahongshan samples, which contain 27.78% of iron. Through the experiment, the first is pre-classification by high-frequency vibrating, and then the iron is recovered by strong magnetic separation of one rough, one scavenger and a gravity concentrating with Slon and chute. The iron concentrate which the grade of Fe is 53.08% and the recovery of 68.45% is obtained and the grade of tailings reduce from 27.78% to 13.80%. Iron tailings get a comprehensive utilization, which has a better effect.

Synchronous Volatilization of Sn, Zn, and As, and Preparation of Direct Reduction Iron (DRI) from a Complex Iron Concentrate via CO Reduction

JOM ◽  
2014 ◽  
Vol 66 (9) ◽  
pp. 1701-1710 ◽  
Author(s):  
Guanghui Li ◽  
Zhixiong You ◽  
Yuanbo Zhang ◽  
Mingjun Rao ◽  
Peidan Wen ◽  
...  
Keyword(s):  
Direct Reduction ◽  
Iron Concentrate ◽  
Direct Reduction Iron ◽  
Co Reduction
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