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Anonymous users2024-02-15Limestone is used in the process of industrial ironmaking, and limestone works by converting impurities such as silica in the ore into slag and removing it.
1. In ironmaking, limestone works by converting impurities such as silica in the ore into slag and removing them; According to the steps of writing the chemical equation, the chemical equation of the ironmaking principle is: Fe2O3+3CO2Fe+3CO2;
2. Calcium carbonate (CaCO3), the main component of limestone. Calcium carbonate is a carbonate compound of calcium with the chemical formula CaCO3. Basically, it is not soluble in water.
Limestone is a hard mineral with calcium carbonate as the main component. is a common rock. In addition, white soil (commonly known as white soil), aragonite, calcite, chalk, limestone, marble, travertine, etc. are all forms of calcium carbonate.
Calcium carbonate is the main component of animal dorsal shells and snail shells. Limestone is also an important building material, which is widely used in industry, and is a raw material for burning lime and cement, a filler for rubber products and paints, and can also be used in medicine.
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Anonymous users2024-02-14Do slag-forming agent.
Because the ore used to make iron contains a certain amount of silica.
After limestone is added, it decomposes at the high temperature of ironmaking.
caCO3=== high temperature==== CAO+CO2. CAO back and silica reaction.
cao+sio==== high temperature ====casio
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Anonymous users2024-02-13It contains calcium to increase the fluidity of molten iron and regulate alkalinity.
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Anonymous users2024-02-12This is to remove impurities from pig iron. As a slag forming agent, silica is removed.
After limestone is added, it is decomposed into CO2 and CAO at high temperature, and CO2 and C react into CO to participate in ironmaking. Impurities such as sulfur and silicon in CAO and molten iron form CAS and CASIO3, which float on the molten iron and can be separated.
Chemical Equation:
caco3=cao+co2
cao+sio2=casio3
The principle of limestone is added to iron smeltingThe iron ore used in ironmaking mainly includes hematite (the main component is iron oxide) and magnetite (the main component is ferric oxide), and in the iron ore there is also useless gangue, the main component is silica (SiO2).
When iron-making, the reduced iron turns into a liquid at high temperatures, and the particulate impurities with silica, which has a high melting point, are mixed in the molten iron. In order to remove this impurity, limestone is used as a flux, which decomposes into calcium oxide and carbon dioxide at high temperatures. Calcium oxide reacts with silica at high temperature to form calcium silicate with a lower melting point than the molten iron, while liquid calcium silicate is less dense than molten iron and is not miscible with molten iron, so it floats on molten iron.
The above content reference: Encyclopedia - Limestone.
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Anonymous users2024-02-11The limestone added to the blast furnace ironmaking converts the impurity silica into slag.
Limestone can remove silica from iron ore, and at the same time can increase the yield of pig iron per unit time, and the carbon dioxide produced by the pyrolysis of limestone reacts with coke to form carbon monoxide, which can be reduced to produce more iron.
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Anonymous users2024-02-10The role of limestone:
Because there are impurities in iron ore, that is, silica, the main component of limestone is calcium carbonate, and calcium carbonate and silica react to form calcium silicate and carbon dioxide, which is the so-called slag.
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Anonymous users2024-02-09Use limestone to make slag to remove calcium and magnesium impurities inside.
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Anonymous users2024-02-08<> limestone is used as a solvent. The role of limestone: because there is silica in the iron ore, calcium carbonate and silica react to form calcium silicate and carbon dioxide, which is slag.
In addition, the effect of adding coke is to react with oxygen to form carbon dioxide, and to react with the dioxide-dried carbon to form carbon monoxide, and then use carbon oxide as a reducing agent to react with iron ore (ferric oxide or ferrous oxide or ferric tetroxide) to form iron and carbon dioxide.
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Anonymous users2024-02-07<> limestone is used as a solvent. The role of limestone: because there is silica in iron ore, calcium carbonate and silica react to form calcium silicate and carbon dioxide, which is slag.
In addition, the noisy effect of adding coke is that it first reacts with oxygen to form carbon dioxide, reacts with the generated carbon dioxide to form carbon monoxide, and then reacts with iron ore (ferric oxide or ferrous oxide or ferric tetroxide) as a reducing agent to produce iron and carbon dioxide. Clerk <>
<> limestone is used as a solvent. The role of limestone: because there is silica in iron ore, calcium carbonate and silica react to form calcium silicate and carbon dioxide, which is slag.
In addition, the effect of adding coke is to react with oxygen to form carbon dioxide, and then react with the generated carbon dioxide to form carbon monoxide, and then use carbon monoxide as a reducing agent to react with iron and wax bond ore (ferric oxide or ferrous oxide or ferric tetroxide) to form iron and carbon dioxide.
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Anonymous users2024-02-06In ironmaking, limestone is used to slag and remove gangue, so that the iron produced by smelting is separated from impurities.
The addition of limestone in the ironmaking process can make the gangue in the iron ore, the ash in the coke and the injection material combine with the limestone and other fluxes added to the furnace, so that the gangue (silica) in the iron ore can be generated into silicate and discharged from the tap port and slag outlet respectively, so as to achieve the purpose of reducing the impurity content in the pig iron.
In addition, when making iron, calcium oxide can be produced by adding limestone, which can neutralize the sulfur dioxide produced to reduce the emission of harmful gases.
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Anonymous users2024-02-05Because the ore used to make iron contains a certain amount of silica.
Therefore, the role of limestone is to convert impurities such as silica into slag and remove them.
The steps are as follows: after limestone is added, it will decompose at the high temperature of ironmaking.
CaCO3 = = High temperature == CAO+CO2 while CAO reacts with silica again.
cao+siO2== high temperature ==casio2
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