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.

Experimental Research of Low-Grade Tin-Iron Ore Separation

2013 ◽  
Vol 641-642 ◽  
pp. 377-380
Author(s):  
Yi Miao Nie ◽  
Qi Hui Dai ◽  
Xiao Long Lu
Keyword(s):  
Magnetic Separation ◽  
Concentration Ratio ◽  
Iron Ore ◽  
Shaking Table ◽  
Low Grade ◽  
Gravity Concentration ◽  
Iron Concentrate ◽  
Stage Separation ◽  
Concentrate Grade ◽  
Iron Grade

Iron ore and tin mineral are the mainly recovered minerals of the low-grade ore, which could be effectively separated by a strong magnetic separation-gravity concentration process, with ore iron grade of 20.3%, tin grade 0.18%. Stage grinding and stage separation was used, getting the grade of iron concentrate and the recovery rate of tin separation index, the feeder of tin was magnetic separation tailing, by shaking table re-election, obtained tin concentrate grade was 10%, production was 0.34% (compared to the original ore, tin dressing) .Tin concentration ratio reached more than 330.

Pilot scale test of producing nickel concentrate from low-grade saprolitic laterite by direct reduction-magnetic separation

2014 ◽  
Vol 21 (5) ◽  
pp. 1771-1777 ◽  
Author(s):  
Guo-lin Zheng ◽  
De-qing Zhu ◽  
Jian Pan ◽  
Qi-hou Li ◽  
Yue-ming An ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Direct Reduction ◽  
Pilot Scale ◽  
Low Grade ◽  
Nickel Concentrate ◽  
Scale Test ◽  
Pilot Scale Test

Magnetic Separation to Recover Iron Minerals from Flotation Tailings

2012 ◽  
Vol 577 ◽  
pp. 183-186
Author(s):  
Si Qing Liu ◽  
Xiong Tong ◽  
Jian Yang ◽  
Jia Gui You
Keyword(s):  
Magnetic Separation ◽  
Low Grade ◽  
Test Results ◽  
Flotation Tailings ◽  
Iron Minerals ◽  
Iron Concentrate

Large amount of surrounding rocks in Jianshui China has been discarded for many years, and the “rock” is characterized by Cu-Fe poly-metallic constituents and of low grade. A joint process of flotation and magnetic separation was proposed to process the ore. This paper introduces the test results of flotation tailings by a wet drum separator. Results show that iron concentrate assaying 60.21-68.12% Fe at a recovery of 71.9-75.32% can be obtained, when the flotation tailings assays 33.91%Fe. At the same time, a joint process has put forward to make full utilize the “rock”.

Study on Process of Microwave Magnetizing Roast for Low-Grade Hematite

2011 ◽  
Vol 201-203 ◽  
pp. 1816-1820
Author(s):  
Jie Li ◽  
Bao Wei Li ◽  
Bang Wen Zhang ◽  
Lei Wang
Keyword(s):  
Carbon Content ◽  
Magnetic Separation ◽  
Low Grade ◽  
Percent Reduction ◽  
Iron Smelting ◽  
Magnetic Process ◽  
P Content ◽  
Roasting Process ◽  
Roasting Temperature ◽  
Roasting Time

The microwave magnetic roasting process of low-grade hematite under low temperature was studied experimentally. The effects of roasting temperature, carbon content and roasting time on the reduction and magnetic separation were investigated. It shows that the best percent reduction is 10.96％(near to theoretical value 11.11%)which can be obtained under the condition of roasting temperature of 650°С , carbon content of 1.0% and roasting time of 10 minute. The results of magnetic separation show that the best magnetic separation grade for the sintered ore occurs at 570 instead of 650°С owing to the sintering of ore powders at high temperature of 650°С . Further ball-milling and magnetic separation of this concentrate produces two kind of final concentrate, one of which is in grade 65.6% with the recovery being 45.3%, and the other is in grade 63.4% with the recovery being 62.6％. After the magnetic separation, concentrate ore meets the iron-smelting requirements because of its low S and P content and high grade. This magnetic process results in the enrichment of RE and Nb in tailing ore, which can be reused for the extraction of Rare Earth and Nb.

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.

Studies on the Effects of Particle Size in Direct Reduction Roasting of Limonite Ores

2011 ◽  
Vol 402 ◽  
pp. 546-551 ◽  
Author(s):  
Jue Kou ◽  
Ti Chang Sun ◽  
Yong Li Li ◽  
Yun Ye Cao
Keyword(s):  
Particle Size ◽  
Magnetic Separation ◽  
Large Particle ◽  
Direct Reduction ◽  
Reduction Roasting ◽  
Large Particle Size ◽  
Direct Reduced Iron ◽  
Effect Of Particle Size ◽  
Separation Parameters ◽  
Roasting Time

A series of direct reduction roasting - magnetic separation tests were carried out with refractory limonite ore in two different particle size compositions. The effect of particle size in the grade and recovery of direct reduced iron (DRI) at different roasting time, temperature and reductant dosages was investigated, and the mineralogical transformations of DRI obtained at different roasting time were analyzed using scanning electron microscopy (SEM-EDS). The results demonstrate that direct reduction roasting with limonite ore in large particle size (100% －20mm) was feasible, and the reducibility of limonite ore in large particle size increased with increasing reductant dosage and roasting time. The optimum reduction roasting - magnetic separation parameters of 100%－20mm limonite ore were proposed as the following: roasting at 1200°C for 120min with 40% reductant, and milling 30min followed by low intensity magnetic separation, which resulted in the DRI with TFe grade of 90.2% and recovery of 89.3%.

Suspended Magnetic Roasting Study of Fine Grained Iron Ore

2013 ◽  
Vol 826 ◽  
pp. 126-129
Author(s):  
Ru Wang ◽  
Yue Xin Han ◽  
Yan Jun Li ◽  
Yu Shu Zhang
Keyword(s):  
Magnetic Separation ◽  
Recovery Rate ◽  
Iron Ore ◽  
Gas Velocity ◽  
Fine Grained ◽  
Iron Concentrate ◽  
Roasting Furnace ◽  
Siderite Ore ◽  
Concentrate Grade

Suspension roasting furnace was used as the reactor of magnetic roasting of fine grained siderite, and the N2 was used as the conveying gas. The results show that, the siderite ore be roasted at the conditions of gas velocity is 1.7m/s, and the roasted time is 12.35s, according to magnetic separation can obtained iron concentrate grade is 65.04%, and recovery rate is 93.03%.

A Combined Beneficiation Process to Recover Iron Minerals from a Finely Disseminated Low-Grade Iron Ore

2013 ◽  
Vol 634-638 ◽  
pp. 3273-3276
Author(s):  
Si Qing Liu ◽  
Min Zhang ◽  
Wan Ping Wang ◽  
Xiu Juan Li
Keyword(s):  
Magnetic Separation ◽  
Iron Ore ◽  
Shaking Table ◽  
Low Grade ◽  
Gravity Concentration ◽  
Iron Minerals ◽  
Iron Concentrate ◽  
Low Intensity ◽  
Mineralogical Study ◽  
Basic Facts

In this research, a refractory iron ore is processed, according to the basic facts of mineralogical study. Mineralogy shows that the ore is characterized by the finely disseminated iron minerals with a small amount in the ore. Iron minerals in the ore are mainly hematite and magnetite. On the basis of the ore characteristic, a flowsheet of "stage grinding-low intensity magnetic separation-high intensity magnetic separation-gravity concentration by fine shaking table" was developed. An iron concentrate assaying 51.45% Fe at a recovery of 62.12% was obtained when the raw ore contains 18.61% Fe.

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