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iron ore slurry line ironoredressingplant

iron ore slurry line ironoredressingplant

Iron ore mining and dressing tec science

Iron is one of the most important metals in mechanical engineering, as it is present in sufficient quantities on earth. The extraction of iron can therefore be very economical. However, pure iron is not suitable for use as a construction material. It is much too soft in its pure form and has too little strength to meet most mechanical requirements. For this reason, it is necessary to use alloying additives to give the iron its hardness and strength. It has been shown that carbon is an excellent alloying element. Within certain limits, carbon has a very high strength and hardness increasing effect and is very cheap compared to other alloying elements. Such a compound of iron and carbon is generally referred to as steel, where the carbon content is less than 2 %. The special importance of steel in mechanical engineering is already demonstrated by the daily production of around 4 million tons of steel! Steel is an alloy of iron and carbon, with a maximum carbon content of 2 %! Basicall...

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Iron does not occur in nature as a pure substance but as a compound in rocks, which can contain up to 50 % iron. These ferrous rocks are also called iron ores. The iron compounds contained therein are mainly iron oxides, but also iron carbonates or iron sulphides. The most important iron oxides include: 1. magnetite: Fe3O4 2. hematite : Fe2O3 3. siderite: FeCO3 4. limonite: 2Fe2O3H2O The iron itself is removed from these iron oxides in the subsequent blast furnace processand processed into steel in combination with carbon. Iron ores are mixtures of ferreous compounds and other undesirable elements! In addition to the actual iron compounds, however, the iron ore always contains various admixtures, which are not of interest for steel production. These waste rocks are also referred to as gangueand are often oxides such as, for example: 1. silicon dioxide 2. manganese oxide 3. calcium oxide 4. magnesium oxide 5. aluminium oxide 6. phosphor...

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After the iron ore has been prepared by crushing and grinding during ore extraction, the ore is actually processed. The aim of this is to reduce the undesirable high proportion of admixtures to a desired minimum in order to increase the iron content. This is done by processes such as flotation or magnetic separation. Subsequently, the milled ores are lumped by sintering or pelletizing in order to optimize chemical reactions in the blast furnace process. Ore processing is the separation of iron ore from gangue in order to optimize the blast furnace process! In principle, the undesirable gangue can never be completely separated from the iron ores during ore dressing. This means that a certain amount of unwanted elements always enters the blast furnace process. Slag forming aggregates are then used to separate these unwanted substances during or after the blast furnace process.

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After processing the iron ore in froth flotation cells or magnetic separators, the finely ground ores cannot be fed directly to the blast furnace, as the enormous compression due to the charging in the blast furnace would impede gas flow. The ores must therefore be made lumpy so that there are sufficient cavities in the charging column for a good gas flow through. The lumpy pieces are made by sintering and pelletizing. Baking ground ore into lumpy, porous pieces is necessary to improve chemical reactivity! During sintering, the fine ores are first mixed with additives and fine coke. This mixture then passes through a funnel onto a circulating moving grate. Ignition flames then set the mixed coke on fire. Due to the high temperatures, the ores bake together to a sinter cake . Air vents provide a suction effect so that the sinter cake actually bakes together over the entire cross section. Afterwards, the porous sinter cake is broken to grain size...

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