منزل •columbite tantalite flextronics - search results

columbite tantalite flextronics - search results

  • Wisconsin Geological & Natural History Survey » Columbite ...

    Description: Columbite-tantalite refers to a group of minerals having varying amounts of iron, manganese, niobium, and tantalum. They are found as platey black grains in complex granitic pegmatites. DODGE COUNTY: Tiny prismatic crystals of manganocolumbite and manganotantalite were seen in pegmatites cutting quartzite in the Michels Materials ...

  • A Review of Niobium-Tantalum Separation in Hydrometallurgy

    Columbite, tantalite, columbite-tantalite (Coltan), pyrochlore, and euxenite constitute the major primary sources for niobium and tantalum and are located in Canada, Brazil, Nigeria, Zaire and Russia [5, 6]. These interesting elements are chemically similar and are associated with each other in nature.

  • Comparison of Some Physicochemical Characterization of ...

    Abstract A detailed physicochemical characterization of columbite and tantalite samples from different locations in Nigeria has been undertaken. Parameters such as moisture content, loss of mass on ignition, pH, and the specific gravity of columbite

  • COLUMBITE (Iron Manganese Magnesium Niobium …

    Tantalite's greatest difference from columbite is its much higher specific gravity, 8.0+ compared to columbite's 5.2. Other properties that vary slightly are color, transparency and streak. Both minerals can be found more or less together in granitic pegmatites rich in lithium and phosphorus minerals with columbite concentrated at the edges of ...

  • Columbite: The mineral columbite-tantalite information and ...

    Columbite is the niobium-rich member, and Tantalite is the tantalum-rich member. Columbite is named after its niobium content, which was previous known as columbium prior to its renaming. Columbite is the most important mineral containing the rare element niobium and is its main ore. The name Columbite has been discredited by the IMA, with the ...

  • Columbite - Wikipedia

    Columbite, also called niobite, niobite-tantalite and columbate [(Fe, Mn)Nb 2 O 6], is a black mineral group that is an ore of niobium.It has a submetallic luster and a high density and is a niobate of iron and manganese.This mineral group was first found in Haddam, Connecticut, in the United States.It forms a series with the tantalum-dominant analogue ferrotantalite and one with the manganese ...

  • Columbite Tantalite – Master Class Mineral – Life's ...

    Columbite, [(Fe, Mn)(Nb, Ta)2O6], also called ferrocolumbite, niobite, niobite-tantalite and columbate is a dull gray to black mineral that is an ore of niobium and tantalum.It has a sub-metallic luster and a high specific gravity and is a niobate of iron and manganese, containing tantalate of iron. Ferrocolumbite is a natural oxide of niobium, tantalum, ferrous iron, and manganese.

  • Conflict minerals policy

    that the trade of certain minerals, Columbite-Tantalite (Coltan/Tantalum), Cassiterite (Tin), Wolframite (Tungsten) and Gold, called Conflict Minerals (3TG), is helping to finance the civil conflict in the DRC characterized by extreme levels of violence, particularly sexual and gender-based violence.

  • Interconnections: Videogame art. Is nothing sacred? (Part ...

    Columbite tantalite – or coltan – is a metallic ore that, when refined (then called Tantalum), is ductile, heat resistant and can be drawn into a very fine wire, thereby allowing for the manufacture of small condensers and micro-electronic technologies. ... Microsoft and Flextronics have also had operations in China since 2002 (Microsoft ...

  • columbite tantalite oxide

    · Columbite, tantalite, columbite-tantalite (Coltan), pyrochlore, and euxenite constitute the major primary sources for niobium and tantalum and are iron oxide, aluminothermic process is used for the production of niobium. Further purification is necessary to reach the grade for superconductive alloys.

  • 3 - Taking the Conflict Out of Conflict Minerals

    1. Columbite-tantalite (Coltan) refined into tantalum (Ta) 2. Cassiterite refined into tin (Sn) 3. Wolframite refined into tungsten (W) 4. Gold (Au) Regardless of their origin Regardless of whether connected to armed groups Commonly referred to as: 3T's plus Gold or 3TG 5 SEC Rule Overview: Basic Three-Step Process 1. Determine applicability 2.

  • Columbite-tantalite and garnet geochemistry in Evje ...

    Columbite-(Fe) and columbite-(Mn) minerals form in the wall zone towards the intermediate zone, while Ta-rich columbite-(Mn) occur together with tantalite-(Mn) in cleavelandite zones. Older studies and a few field observations show that columbite-(Fe) may form with REE-oxides like polycrase-(Y) and euxenite-(Y), but after the oxides have

  • Experimental studies of Ta 2 O 5 and columbite-tantalite ...

    The dependence of columbite-tantalite (Nb 2 O 5 -59 wt. %, Ta 2 O 5 -18 wt. %) solubility as a function of solution composition, T, and P has also been investigated. Tantalum and Nb concentrations have the highest values in HF solutions at reduced conditions (up to …

  • [Solved] Discussion Case: Conict Coltan in the Global ...

    Columbite—tantalite, or "coltan" as it is commonly known, is a black metallic ore. When refined, it produces tantalum, which is used to regulate electric— ity in portable consumer electronics, such as smattphones, laptops, play stations, and digi— tal cameras.

  • FORM SD Specialized Disclosure Report SILICOM LTD.

    Conflict minerals are defined by the SEC as columbite-tantalite (coltan), cassiterite, gold, wolframite, or their derivatives, which are ... (such as Flextronics' database). Supplie r responses have been checked and quality and relevance of a nswers have been verified when

  • Manufacturing

    Conflict minerals include: columbite-tantalite (coltan) (i.e., tantalum), cassiterite (i.e., tin), gold, wolframite (i.e., tungsten) or their derivatives and could expand to include any other mineral or their derivative determined by the U.S. Secretary of State to be financing the DRC conflict.

  • Effect of surface modification by lead ions on flotation ...

    Abstract Ta and Nb are listed in the category of strategic metals. Columbite-tantalite is the most abundant Nb- and Ta-containing mineral. The flotation is a promising method for fine columbite-tantalite recovery. However, few studies have been performed on the surface modification and enhanced flotation recovery of columbite-tantalite in presence of benzohydroxamic acid (BHA).

  • Columbite - an overview | ScienceDirect Topics

    Rare examples of columbite–tantalite, ideally (Mn,Fe)(Nb,Ta) 2 O 6, were reported to contain enough U to induce amorphization (see Lumpkin 102 and references to previous work). These ∼1800 Ma samples are zoned in both the TiO 2 (2.2–4.8 wt%) and UO 2 (0.2–2.6 wt%) contents and exhibit a critical amorphization dose of 8 × 10 16 α per ...

  • Columbite Photos and Premium High Res Pictures - Getty Images

    31 Columbite Premium High Res Photos. Browse 31 columbite stock photos and images available, or start a new search to explore more stock photos and images. Venezuelans soldier stand guard during an operation aimed to protect coltan ores in Cedeno, state of Bolivar, Venezuela on November 5, 2009.... Venezuela's Science and Technology Minister ...

  • CONFLICT MINERALS POLICY - Teradata

    as cassiterite, columbite-tantalite, coltan and wolframite, irrespective of source or origin; also ... but rather it has Flextronics International Ltd. (including any of its applicable parent, subsidiary and affiliated companies) (collectively "Flextronics") serve as Teradata's

  • Columbite-tantalite - Wikipedia

    Alluvial columbite-tantalite series (not analysed) pebbles to 8 mm in a jar from the Greenbushes Tinfield. Old material, probably late 19th or early 20th century with original label. This sample ended in the UK and was purchased in 2008 from Cornwall mineral dealer Nick Carruth. Nick obtained it from a deceased estate around 1987.

  • Experimental studies of Ta2O5 and columbite–tantalite ...

    12%Low solubility experimental data for columbite–tantalite in HCl, Na 2 CO 3, and NaHCO 3 solutions is important for understanding the genesis of hydrothermal Nb and Ta deposits. In HCl solutions, the Ta concentration ranges from 10 −7 to 10 −4 m under the P-T conditions of the experiments. In Na 2 CO 3 and NaHCO 3 solutions, the columbite–tantalite solubility is …

  • Columbite - TheFreeDictionary.com

    Columbite. (from Latin columbium, an alternate name for niobium), a mineral of the columbite-tantalite group, combining complex oxides of the AB 2 O 6 type and forming the isomorphic series FeNb2 O 6—MnNb2 O 6 (columbite proper) and FeTa2 O 6—MnTa2 O 6 (tantalite). The columbites also include members of isomorphic series in which niobium ...

  • Columbite - Geology Page

    Columbite, also called niobite, niobite-tantalite and columbate [ (Fe, Mn)Nb 2 O 6 ], is a black mineral group that is an ore of niobium. It has a submetallic luster and a high density and is a niobate of iron and manganese. This mineral group was first found in …

  • SOLUTION: Saint Leo University Intel and Conflict Minerals ...

    Columbite-tantalite, commonly known as "coltan," is a black metallic ore. When refined, it produces tantalum, which is used to regulate electricity in portable consumer electronics, such as smartphones, laptops, play stations, and digital cameras.

  • Wavelength-dispersive x-ray fluorescence spectrometric ...

    12%Samples of columbite-tantalite ground to minus 300 mesh are blended with cellulose in the proportion of 1:1, and pressed powder-pellets are made from 1-g aliquots, with boric acid as a backing. The analytical standards consist of chemically analysed columbite-tantalite containing 5 to 80% by weight of Ta2O5.