Quartz magnetite/hematite

Let us now examine changes in mineral adhesion that are related to the choice of drum material [137]. For the separation of powders such as quartz, magnetite, hematite, pyrite, barite, asbestos, and j3-spodumene, the yield of the retained fraction on brass and aluminum surfaces was found to vary from 26 to 50%, and on tin plate and steel from 46 to 66%. The adhesion of these powders to tin plate and steel was greater than the adhesion to brass or aluminum. 

It will be both interesting and instructive to describe the separation process principles for two substances one a quartz-magnetite, and the other a quartz-hematite. The quartz-magnetite when ground would consist of liberated quartz particles, liberated magnetite... 

The Hostrock and Backfill Material. Most crystalline igneous rocks, including granite and gneiss, are composed of a comparatively small number of rock forming silicate minerals like quartz, feldspars (albite, microcline, anorthite etc.) micas (biotite, muscovite) and sometimes pyroxenes, amphiboles, olivine and others. Besides, there is a rather limited number of common accessory minerals like magnetite, hematite, pyrite, fluorite, apatite, cal cite and others. Moreover, the weathering and alteration products (clay minerals etc.) from these major constituents of the rock would be present, especially on water exposed surfaces in cracks and fissures. 

Quartz Mullite Hematite Magnetite Carbon Density Glass" (kgm ) ... 

The Shanbaidu polymetallic deposit comprises genetically related but spatially separate iron and lead-zinc skam deposits in the contact zone of quartz-diorite and limestone. The ore minerals are mainly magnetite, hematite, galena and sphalerite. The ore bodies are found at depths of 5-40 m, and the surface of the area is covered by 5-15 m of transported exotic overburden. Thermally-released Hg, data from samples collected at depths of 30, 60 and 80 cm in the soil along a traverse crossing both ore deposits are shown in Fig. 13-9. In the samples from 60 and 80 cm, clear anomalies mark the positions of the mineralisation. In the samples from 30 cm, however, the background is... 

Scandinavia Sydvaranger and others, Norway Stripa and others, central Sweden Porkonen and Jussaari, Finland Banded quart-hematite, quartz-magnetite Generally few tens of meters or less... 

Kursk (Kursk magnetic anomaly) Banded quartz-hematite, quartz-magnetite 500... 

Southern Manchuria and adjacent areas of Korea Banded hematite-quartz, magnetite-quartz 400 (at Miao Erh Kou)... 

Bailadila, Rowgat, and adjacent deposits of Madhya Pradesh Banded quartz-magnetite, quartz-hematite 460... 

Hyderabad Quartz-magnetite, quartz-hematite, schist 45... 

The magnetite/hematite-quartz thermometer has been extensively applied to banded... 

The phase composition of fly ash can be very different even in particular grains. Glass is a main constituent its content in the sihceous fly ash is generally higher than 80%. The crystalline phases are quartz, mrrlhte, hematite and magnetite. In Table 7.6 some examples of different fly ash composition are shown. 

Triboadhesive enrichment or beneficiation can be used successfully in two types of applications size classification of powdered materials and the separation of mineral particles from impurities. In the first category we may mention the classification of powders such as quartz, barite, magnetite, hematite, pyrite, feldspar, coal, asbestos, graphite, periclase (crystalline magnesium oxide), pegmatite, and iron ore. As an illustration of an application in the second category we may mention the separation of asbestos fiber ( falling product) from mineral dust that adheres to the drum surface ( retained product) [327]. 

Associated minerals These mineral constituents do not impart plasticity to clay. Examples include silicate minerals like micas, quartz, feldspars etc. iron oxides and hydroxides like magnetite, hematite, maghemite, goethite, lepidoerocite etc. and aluminium oxides and hydroxides like corundum, gibbside, boehmite, diaspore etc. 

In the first case this relates to the separation of quartz, barytes, magnetite, hematite, pyrites, fluorspar, coal, asbestos, graphite, periclase (crystalline magnesium oxide), pegmatite, and iron ore. 

Fly ash contains about 15% crystalline material, the rest being an amorphous material and carbon. The major crystalline materials in fly ash are quartz, mullite, hematite, and magnetite. The reactivity of fly ash depends on the loss on ignition, fineness, and mineralogical and chemical composition. The pozzolanic activity also depends on the mineralogy of coal and on the glassy or non-crystalline structure of fly ash. 

The predominant gangue minerals vary with different types of ore deposits quartz, chalcedonic quartz, adularia, calcite, smectite, interstratified mica/smectite, interstratified chlorite/smectite, sericite, zeolites and kaolinite in Au-Ag rich deposits chlorite, quartz, sericite, carbonates (calcite, rhodoehrosite, siderite), and rare magnetite in Pb-Zn rich deposits chlorite, serieite, siderite, hematite, magnetite and rare epidote in Cu-rich deposits (Sudo, 1954 Nagasawa et al., 1976 Shikazono, 1985b). 

Koryu aguilarite, pearceite, polybasite, proustite, pyrargyrite electrum, miargyrite, native silver, chalcopyrite, fahore, hematite, magnetite, pyrite, galena, sphalerite quartz, adularia, johannsenite, chlorite, kaolinite, vermiculite, Mn-calcite... 

The main alteration minerals surrounding Kuroko ore body are K-mica, K-feldspar, kaolinite, albite, chlorite, quartz, gypsum, anhydrite, and carbonates (dolomite, calcite, magnesite-siderite solid solution), hematite, pyrite and magnetite. Epidote is rarely found in the altered basalt (Shikazono et al., 1995). It contains higher amounts of ferrous iron (Fe203 content) than that from midoceanic ridges (Shikazono, 1984). 

Figure 5.51 fo2 stability field of biotite. (A) Pseudobinary phlogopite-annite mixture. Numbers at experimental points indicate observed Fe/(Fe + Mg) atom ratio. (B) Annite. HM = hematite-magnetite buffer NNO = Ni-NiO buffer MW = magnetite-wuestite buffer QFM = quartz-fayalite-magnetite buffer. From Wones and Eugster (1965). Reprinted with permission of The Mineralogical Society of America. 

Qy. = Born solvation term B = coulombic repulsion term Kh+ = adsorption constant for H ). An excellent correlation resulted between the experimentally determined and calculated pHp c for nine different solids, namely quartz, kaolinite, rutile, magnetite, goethite, hematite, corundum gibbsite and MgO. For the Fe oxides, the predicted (experimentally determined) values were magnetite 7.1 (6.6), hematite 8.47 (8.5) and goethite 9.0 (9.4). 

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