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%.

Hevea Latex of Large Particle Size

1939 ◽  
Vol 31 (12) ◽  
pp. 1509-1512 ◽  
Author(s):  
J. McGavack
Keyword(s):  
Particle Size ◽  
Large Particle ◽  
Large Particle Size

Microwave-assisted removal of sulfur in large particle size coal by bromine water

Fuel ◽  
2021 ◽  
Vol 289 ◽  
pp. 119838
Author(s):  
Xiaogang Mu ◽  
Jinfang Liu ◽  
Fei Gao ◽  
Cunbao Deng ◽  
Zhixin Jin ◽  
...  
Keyword(s):  
Particle Size ◽  
Large Particle ◽  
Large Particle Size ◽  
Bromine Water ◽  
Microwave Assisted

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.

Direct synthesis of zeolite Y with large particle size

2001 ◽  
Vol 3 (7) ◽  
pp. 773-780 ◽  
Author(s):  
Samia Ferchiche ◽  
Juliusz Warzywoda ◽  
Albert Sacco
Keyword(s):  
Particle Size ◽  
Large Particle ◽  
Zeolite Y ◽  
Direct Synthesis ◽  
Large Particle Size

scholarly journals Influence of bagasse ash with different fineness on alkali-silica reactivity of mortar

2018 ◽  
Vol 68 (332) ◽  
pp. 169 ◽  
Author(s):  
S. Ramjan ◽  
W. Tangchirapat ◽  
C. Jaturapitakkul
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Portland Cement ◽  
Large Particle ◽  
Ordinary Portland Cement ◽  
Alkali Silica Reaction ◽  
Large Particle Size ◽  
High Compressive Strength ◽  
Alkali Silica Reactivity

This research aimed to study the effect of finenesses of bagasse ash (BGA) on the alkali-silica reaction of mortar. The BGA sample was ground to have particles retained on a sieve No. 325 of 33±1% and 5±1% by weight. Ground BGA samples were used separately to replace ordinary Portland cement (OPC) at rates of 10, 20, 30 and 40% by weight of binder to cast mortars. The compressive strengths and the alkali-silica reaction (ASR) of mortars were investigated. The results showed that a large particle size of BGA is not suitable for use in lowering ASR because it results in a low compressive strength and high expansion due to ASR. The mortars containing BGA with higher fineness exhibited higher compressive strength and lower expansion due to ASR than the mortars containing BGA with lower fineness. The results also suggested that the ground BGA retained on a sieve No. 325 of less than 5% by weight is suitable to be used as a good pozzolan which provides high compressive strength and reduces the expansion of mortar due to ASR even though it contains high LOI. The obtained results also encourage the utilization of ground BGA effectively which leads to reduce the disposal of bagasse ash.

scholarly journals RESEARCH ON STABILITY OF FISHING BANK MADE BY LARGE PARTICLE SIZE POROUS CONCRETE PLACED UNDER SEA : Experiment using large scale waterway(Materials and Construction)

2005 ◽  
Vol 11 (22) ◽  
pp. 53-58
Author(s):  
Akihiro MAEGAWA ◽  
Toshihiko SHAKOUCHI ◽  
Yukihisa YUASA ◽  
Naoki MISHIMA ◽  
Shigemitsu HATANAKA
Keyword(s):  
Particle Size ◽  
Large Particle ◽  
Large Scale ◽  
Large Particle Size ◽  
Porous Concrete
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