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 Three types products of iron, used in the steel industry: Separated iron ore (lowiron) and sintered (by heat treatment of the iron content increased) and pellets (wet weight with the addition of iron-containing izvestnyakaformiruetsya in the balls with a diameter of about 1 cm). The following are different types of iron ore industry:
- Titanium-magnetite and ilmenite and titanomagnetite in basites ultrabasic
- Apatite-magnetite in carbonatites
- Magnetite and magnetic magnetite skarns in
- Magnetite-hematite in iron quartzites
- Martite and March-gidrogematitovye (rich ore formed on iron quartzites)
- Goethite-hydrogoethite in weathering crusts.
Iron ore diverse mineral composition, iron content, useful and harmful impurities, formation conditions and industrial properties. The most important ore minerals are magnetite, magnomagnetit, titanomagnetite, hematite, hydrohematite, goethite, hydrogoethite, siderite, zhelezistyehlority (chamosite, Thuringia, and others). Contents zhelezav industrial ores varies widely - from 16 to 70%. Distinguish between the rich (³ 50% Fe), ordinary (50-25% Fe) and poor (³ 25% Fe) zheleznyerudyV depending himicheskogosostava zheleznyerudyprimenyayutsya for iron in its natural form or after enrichment. Iron ore containing less than 50% Fe, enriched (60% Fe) main methods magnitnoyseparatsii or gravity separation. Loose and sulfur (> 0,3% S) rich ores and concentrates enrichment okuskovyvayutsya by sintering, also made from concentrate so-called. pellets. Iron ore coming into the blast mine, in order to avoid deterioration of the steel and smelting conditions, shall not contain more than 0,1-0,3% S, P and Cui 0,05-0,09% As, Zn, tin metal, Pb . Impurity in iron ore Mn, Cr, Ni, Ti, V, Co, except for some cases, it is useful. The first three elements improve the quality of steel, Ti, V, Co may be removed simultaneously with dressing and smelting.
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