DOI: 10.1016/J.POWTEC.2007.03.028 Corpus ID: 94015823; Sulfur tolerance of an inexpensive limonite catalyst for high temperature decomposition of ammonia @article{Tsubouchi2008SulfurTO, title={Sulfur tolerance of an inexpensive limonite catalyst for high temperature decomposition of ammonia}, author={Naoto Tsubouchi and Hiroyuki …Web
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Description: Limonite is a general term for a mixture of fine-grained iron oxides, generally dominated by goethite, but also possibly containing hematite, lepidochrocite and other minerals. It forms from the weathering …Web
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The concentration of low grade iron ore resources was evaluated by washing and reduction. The advanced concentration methods for low grade limonite and hematite iron ores of South Eastern Anatolian resources required such specific methods. The followed column flotation and magnetic separation, microwave radiated reduction of hematite …Web
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Limonite is a common brown, black, or yellow amorphous secondary mineral that consists of hydrated ferric oxides and is a source of iron. It is one of the major iron minerals, hydrated ferric oxide (FeO (OH)· n H 2 O). It was originally considered one of a series of such oxides; later it was thought to be the amorphous equivalent of goethite ...Web
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Limonite is a natural resource formed by the weathering of iron-bearing materials (eg, hematite, magnetite, and pyrite) that emerge from the underground waters at springs, mine openings, and during the eruption of volcanos. The subsurface waters contain almost no oxygen. Therefore, when the underground waters move to the surface ground, …Web
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received limonite is composed of about 90 mass% of a-FeOOH, andthe metal compositionona dry basis is: Fe, 55.6; Si, 2.3; Al, 1.4; Ca, 0.2; Mg, 0.1 mass%. About 90% of the limonite had the size fraction of <250 lm, and the BET surface area was 20 m2 g)1. The limonite was first reduced with pure H 2 at 500 C and then supplied to NH 3Web
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Figure 4.5.5 4.5. 5: Limonite, hydrated oxide of iron. After carbonates, the next most common non-silicate minerals are the oxides, halides, and sulfides. Oxides consist of metal ions covalently bonded with oxygen. The most familiar oxide is rust, which is a combination of iron oxides (Fe 2 O 3) and hydrated oxides.Web
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Limonite nodules and limonite-cemented beds are common. Unconsolidated > Fine-detrital > Clay The Citronelle Formation consists of gray to orange, often mottled, unconsolidated to poorly consolidated, very fine to very coarse, poorly sorted, clean to clayey sands. It contains significant amounts of clay, silt and gravel which may occur as beds ...Web
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In practice and following Blain and Andrew ( 1977) and Blanchard ( 1968, 1984 ), we refer to limonite as a field term for a mixture or aggregate of amorphous, colloidal …Web
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Earthy Name: Named in 1813 by Johann Friedrich Ludwig Hausmann from the greek λειμωυ for meadow alluding to its common occurrences in bogs. Currently used as a field-term …Web
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While goethite and limonite are both formed through the weathering of iron-rich rocks, the specific conditions of the weathering process can result in different mineral compositions. For instance, if the weathering process occurs in a low-oxygen environment, goethite may not form at all and limonite may be the only mineral present. ...Web
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Limonite itself is formed from the hydration by way of oxidation of the other iron ores, magnetite and hematite. In addition, it can be formed from weathering processes on other minerals rich in iron. When found in a deposit, limonite is an amorphous solid, appearing in shades of yellow or brown, with a moderate hardness level of 4 - 5.5 on the ...Web
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Limonite usually occurs as a secondary material, formed from the weathering of hematite, magnetite, pyrite, and other iron-bearing materials. Limonite is often …Web
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Goethite is normally formed under oxidizing conditions as a weathering product of iron minerals (e.g., pyrite, magnetite). Because it is formed near the surface, goethite is the major component of the gossan of iron sulfide deposits in locations such as Arizona and of lateritic deposits in places such as Cuba .Web
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The intergrowth between magnetite and limonite formed maghemite (Mag), Conclusions (1) Yunnan nickel laterite ore, which belonged to a high magnesium (31.49 wt.% MgO), low nickel (0.82 wt.%) laterite ore, mainly consisted of …Web
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Figure 3.5.5 3.5. 5: Limonite, hydrated oxide of iron. After carbonates, the next most common non-silicate minerals are the oxides, halides, and sulfides. Oxides consist of metal ions covalently bonded with oxygen. The most familiar oxide is rust, which is a combination of iron oxides (Fe 2 O 3) and hydrated oxides.Web
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The limonite in the form of veins and discrete mass can be seen (10×). c Typical light pink colored triangular pits of galena formed by three sets of cleavages cross-cut each other at 120°. Partially altered galena (gn) …Web
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Limonite forms through the weathering of iron-bearing minerals such as pyrite, magnetite, and hematite under conditions of low temperature and low oxygen. The iron oxide minerals react with water and oxygen in the atmosphere to form hydrated iron oxides, primarily goethite and lepidocrocite. The …
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Limonite is one of the three principal iron ores, alongside Hematite and Magnetite. It is a secondary stone that is formed by the weathering of other iron-bearing minerals.Web
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The limonite, formed by intense chemical weathering of basalt, was deposited in basins and stream channels in an interval of quiescence during the effusion of the Colum bia River basalts. The deposits of limonite are -older than and unrelated to the laterites and ferruginous bauxite that are also found in this general area. ...Web
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limonite ageing, colour, interpreting composition and colour range of tones depending on available chemical elements during their formation process, as well as granular composition.Web
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Limonite is a mixture of fine-grained hydrated iron oxides. It is chemically similar to goethite (HFeO2), but varies from ideal goethite by having more water. Although goethite is a …Web
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Limonite is an iron ore consisting of a mixture of hydrated iron oxide-hydroxides in varying composition. The generic formula is frequently written as FeO ·nH2O, although this is not entirely accurate as the ratio of oxide to hydroxide can vary quite widely. Limonite is one of the three principal iron ores, the others being hematite and magnetite, and has been …Web
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Limonite is sometimes formed in large quantities by the weathering of the sulphides of iron; such gossan has occasionally been used as an iron ore. At Bannockburn, in the Madoc area, a pyrite deposit was discovered below the limonite, which was being mined as an iron ore; this gossan capping of the pyrite was from eight to fifteen feet deep. ...Web
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For Gli 400 material, after 20 min of reaction, about 11.9 mL of O 2 were formed while the natural limonite formed only 1.5 mL. Gli 300 (6.5 mL of O 2) and Gli 500 (8.0 mL of O 2) are much less active than Gli 400, taking into consideration the activity of Gli 400 catalyst. Furthermore, the materials were evaluated in the oxidation of methylene ...Web
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The U.S. Department of Energy's Office of Scientific and Technical InformationWeb
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