scholarly journals Removal of Metallic Iron from Reduced Ilmenite by Aeration Leaching

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1020
Author(s):  
Qiuyue Zhao ◽  
Maoyuan Li ◽  
Lei Zhou ◽  
Mingzhao Zheng ◽  
Ting’an Zhang
Keyword(s):  
Iron Content ◽  
Metallic Iron ◽  
Carbothermic Reduction ◽  
Room Temperature ◽  
Total Iron ◽  
Total Iron Content ◽  
Tio2 Content ◽  
Synthetic Rutile ◽  
Ilmenite Concentrate ◽  
Hcl Solution

Aeration leaching was used to obtain synthetic rutile from a reduced ilmenite. The reduced ilmenite, obtained from the carbothermic reduction of ilmenite concentrate in a rotary kiln at about 1100 °C, contained 62.88% TiO2 and 28.93% Metallic iron. The particle size was about 200 μm and the size distribution was uniform. The effects of NH4Cl and HCl concentrations, stirring speed, and aeration leaching time on the extent of removal of metallic iron from the reduced ilmenite were studied at room temperature. The results revealed that aeration leaching is feasible at room temperature. When using the NH4Cl system, the metallic iron content was reduced to 1.98% in synthetic rutile, but the TiO2 content only reached 69.16%. Higher NH4Cl concentration did not improve the leaching. Using 2% NH4Cl with 3% HCl, we were able to upgrade the synthetic rutile to 75%, with a metallic iron content as low as 0.14% and a total iron content of about 4%. Synthetic rutile could be upgraded to about 90% using HCl solution alone. HCl and NH4Cl are both effective on the aeration leaching process. However, within the scope of this experiment, hydrochloric acid is more efficient in aeration leaching.

Mössbauer studies of Luna 16 and 20 lunar soils

1977 ◽  
Vol 284 (1319) ◽  
pp. 157-165 ◽  
Keyword(s):  
Solar Wind ◽  
Iron Content ◽  
Metallic Iron ◽  
Fine Particle ◽  
Lunar Soil ◽  
Total Iron ◽  
Total Iron Content ◽  
Mineral Phases ◽  
Iron Phase ◽  
Wind Reduction

Samples of lunar soil returned by Luna 16 from Mare Fecunditatis and by Luna 20 from the highlands near the crater Appolonius G have been studied by 57 Fe Mössbauer spectroscopy. This enables the distribution of the total iron content between the various mineral phases to be determined. No troilite, magnetite or Fe 3+ was detected and the suggestion that ulvospinel (Fe 2 TiO 4 ) is present in substantial amounts in the fine-particle separates is discounted. The spectra were shown to arise from a metallic iron phase, and from Fe 2+ in olivine, in the M l and M2 sites of pyroxene, in ilmenite and in glasses. The slight asymmetry of the spectra is ascribed to superpara-magnetic iron in the finest particles and it is considered that this is formed by solar-wind reduction. The ilmenite content of the Luna 16 soil is higher than for Apollo 12, 14 and 15 soils but less than for Apollo 11 soil; the ilmenite content of the Luna 20 soil is exceptionally low. The soils from both Luna missions show an increased amount of iron in olivine and M1 pyroxene sites comparable with that found for Apollo 15 soils from the edge of Hadley Rille. The narrower linewidths in the Mössbauer spectra of the Luna 20 soil suggest that the proportion of iron-containing glassy phases in this sample is lower than for the Luna 16 soil.

Clay mineralogy of parent materials derived from uppermost Cretaceous and Tertiary sedimentary rocks in southern Saskatchewan

1993 ◽  
Vol 73 (4) ◽  
pp. 447-457 ◽  
Author(s):  
W. E. Dubbin ◽  
A. R. Mermut ◽  
H. P. W. Rostad
Keyword(s):  
Organic Carbon ◽  
Iron Content ◽  
Sedimentary Rocks ◽  
Clay Mineralogy ◽  
Total Iron ◽  
Total Iron Content ◽  
Parent Materials ◽  
Surface Areas ◽  
General Chemical ◽  
Detailed Chemical

Soils developed from parent materials derived from uppermost Cretaceous and Tertiary sedimentary rocks have been delineated from those which do not contain any of these younger sediments. The present study was initiated to determine the validity of this delineation. Parent materials from six locations in southwestern Saskatchewan were collected to determine their general chemical and physical properties. Clay fractions from each of these six parent materials were then subjected to detailed chemical and mineralogical analyses. The two parent materials containing the greatest amount of post-Bearpaw bedrock sediments (Jones Creek, Scotsguard) were characterized by substantially more organic carbon and less CaCO3. The presence of coal and the absence of carbonates in local bedrocks were considered to be the source of these deviations. In general, fine clays were comprised of 64–69% smectite, 14–21% illite and 10–13% kaolinite and coarse clay contained 32–39% smectite, 25–34% illite and 11–14% kaolinite. An exception was found in two fine clays which had less smectite but 3–6% vermiculite. Total iron content of the fine clays ranged from 7.16 to 8.11% expressed as Fe2O3. However, only a small fraction of this iron was extractable using the CDB technique. There were no substantial differences in surface areas or CECs of the clay fractions. Despite minor differences in the chemistry and mineralogy of these six parent materials, a separation of the soil associations does not appear to be warranted. Key words: Parent materials, uppermost Cretaceous, Tertiary, bedrock, clay mineralogy

Sign in / Sign up

Export Citation Format

Share Document