What is the charcoal fire adding to melt iron into molten iron

Thermite reaction, experimental operation:

1.Take a round piece of filter paper and pour in 5 grams of dry iron oxide powder, and then pour in 2 grams of aluminum powder.

2.Mix the two well. Use two round pieces of filter paper, each folded into a funnel shape, remove one of them, cut a hole in the bottom, and use water.

Thermite reaction. Moisten and put it together with another funnel so that there are four layers on all sides.

3.Set it on the iron ring, place the evaporation dish containing sand below, put the evenly mixed iron oxide powder and aluminum powder in the paper funnel, add a small amount of potassium chlorate on it, and insert a magnesium strip in the middle of the mixture, ignite the magnesium strip, and observe the phenomenon that occurs.

Phenomenon: You can see that the magnesium strip burns violently, releasing a lot of heat, so that the iron oxide powder and aluminum powder react violently at high temperature, releasing a large amount of heat, and at the same time the paper funnel is burned through, and the melt falls into the sand, after the melt cools, remove the outer layer of slag, and observe carefully, you can see that the iron beads that fall are called thermite reaction. The reaction produces liquid iron and alumina.

Charcoal, bluestone (catalyst).

Charcoal in the ironmaking process.

There are two functions.

Heating provides energy to provide heat energy.

Provides a reducing environment for the carbon in charcoal as well as carbon monoxide.

are all good reducing agents.

It can reduce iron oxides to elemental iron.

The role of charcoal is to absorb impurities.

There are two main functions.

1.Heating provides energy to provide heat energy.

2.To provide a reducing environment, the carbon in charcoal and the carbon monoxide produced are good reducing agents, which can reduce iron oxides to elemental iron.

It can be simply thought of as the reaction of aluminum with certain metal oxides (such as Fe2O3, Fe3O4, Cr2O3, V2O5, etc.) under high thermal conditions.

The thermite reaction is often used to smelt metals with high melting points, and it is an exothermic reaction.

Experimental Reaction Chemical Equations:

Iron oxide: 2Al+Fe2O3=Al2O3+2Fe ferric tetroxide:

8al+3fe3o4=4al2o3+9fe

After the iron is melted into molten iron, it can be poured into a mold and cast into various iron objects.

The melting of iron is a physical change, from a solid state to a liquid state.

The combustion of charcoal, which is carried by solid mountains, turns into charcoal ash or smoke, which is a chemical change.

It is only a change in state, and the nature of the object does not change, which is a physical change.

Regardless of whether the state has changed or not, as long as the properties of the socks substance have changed, it is a chemical change.