Compounds of iron ore

Compounds of iron ore

Iron is an element with atomic number 26 and atomic weight 55.85 melting point is 1535 and the boiling point of 3000 ° C. The prevalence of iron fourth constituent element of the Earth's crust and is made up 4.2 percent of the shell of the element.

The most common ore minerals, especially magnetite oxide (Fe 3o 4) and hematite (Fe 2 o 3) are the gray to yellow and red variables. Goethite and limonite and carbonate minerals other public such as the Bashnd.mhmtryn Feco 3 iron ore reserves as (Banded Iron Formation) are known. Magmatic deposits also can be a source of magnetite reserves.

Iron ores are diverse in terms of structure and chemical composition.
Since furnace iron and steel, raw materials could have the maximum efficiency with the fixed combination of different types of rocks, so it is necessary to supply iron as well as ancillary material into the furnace so that the feed of the chemical and mechanical properties constant is .

Iron ore production and preparation processes in which a high-grade iron ore fines particles become. Generally, the purpose of iron ore in blast furnaces in the iron and steel industry include:

ـ Efficient use of high-grade iron ore for use in blast furnaces revival.

ـ Preparation for blast furnaces reducing the physical, chemical, metallurgical and mechanical desirable.

ـ Slag reduction, increased production efficiency.

ـ Reduction in treatment costs later in iron and steel production (smelting and refining).

Because of the abundant iron ore expansion should be relatively high proportion of metal to be considered as a source of iron. For example, today, as a source of iron deposits Yarkmtr of 25% is not considered unless extended storage or processing large volume and have low cost. The value of iron ore is related to the following four factors:

1. grade
2. Ease of processing
3. Shipping Costs
4. carrying stones to the market.

Therefore, in most cases, to achieve the specifications of the iron ore requirements of the steel industry must be processed iron ore extracted from the mines. The purpose of processing of iron ore, increasing the iron content and reduce the content of harmful and annoying it is. In addition, a number of elements that are harmful if the amount does not exceed a certain amount and improve the quality of steel production are improving. The most useful and harmful materials in iron ore are:

Titanium (TIO2)
Titanium steel properties can be improved. The presence of titanium in iron ore slag viscosity increases, causing thickening of the slag. For this reason, the lower alkaline slag is considered that this is due to blast furnace slag is regime change. A large amount of titanium to reduce activity and decrease Metallization Ahyapzyry be desired. Because titanium oxide can be protective in the lining of the lower part of blast furnace form a class, a certain amount of approximately 2 / 0-1 / 0% of titanium oxide is useful in iron ore

Manganese oxide (Mno2)
There are more manganese ore into iron was about 80% and the remainder in the form of oxide into the slag. Manganese strength, hardness and wear resistance to steel increases. Desulphurization of iron and manganese makes it easy to reduce the negative impact of sulfur is used to produce steel. As a result, recent studies reveal that the amount of manganese in the converter has a detrimental effect on phosphorus removal. If the amount of manganese and phosphorus hot metal 2.0 of 1.0 percent can be expected that the amount of phosphorus in steel to less than 005/0 percent.

Oxides of acidic slag (Al2O3, SiO2)

The amount of acid oxides Al2O3 and SiO2 should be low in iron ore. Under these acidic oxides, a lot of limestone or dolomite to neutralize the slag is required, which increases fuel consumption and decreases operation cost and production capacity of the furnace. On the other hand limestone and dolomite used Drgndlh should be very soft, which also increases the cost of production. Based on calculations of scholars in 1981, an increase of one percent silica in the blast furnace load, the need to ensure a balanced composition of the required minimum slag, pig iron production costs per ton of approximately US $ 55.1 increase. If the cost of processing to remove silica from iron ore, a 9.2 per dollar, the cost to remove excess silica, a blast furnace at about 95 dollars.

This rarely happens that the iron ore extracted from the mine immediately after the grinding and classification procedures in place to the blast furnaces to produce steel shipped. Iron ore is the main raw material production units granulated iron blast furnace method is. In the blast furnace process to be economical production method is tried the iron content of iron ore that is used to produce more than 60 percent.