Is Higher Porosity Better for Iron Ore Pellet ?

There are several reasons for the formation of porosity in iron ore pellet.

(In order of temperature from low to high).

1. The process of evaporation of free water into water vapor, and the process of removal of crystallized water into water vapor.

2. The process of decomposition and volatilization of organic matter;

3. The decomposition of hydroxides, carbonates, etc.;

4. The oxidation and combustion process of carbon;

5. Deformation caused by changes in the valence of iron oxide,etc.;

The harm of too high or too low porosity:

Reasonable pore content, on the one hand, provides space for stress release for micro-expansion, and on the other hand, provides a channel for gas overflow.

1. When the porosity is too high, the pellet density will be low and the strength will inevitably decrease;

2. When the porosity is too low, the cold strength will be higher, but in the process of heating, especially in the rapid generation of gas caused by expansion, the pellet will be destroyed.

The most harmful is the gasification rate is too fast, resulting in expansion damage. Decrease the thermal strength and increase the pulverisation

rate.

The so-called porosity "reasonable range", for specific components, is not the same.

In order not to produce significant expansion, and favourable to the metallurgical properties of the best. Specific indicators need to be verified through testing.

To sum it up in one sentence: within a reasonable range, the smaller the porosity, the better.

Our organic binder can enhance the porosity of pellets, improve reducibility and increase economic benefits.

Feel free to contact me if you have any quetsions regarding binder :

Vicky Wen

Mobile/Whats:+86 18828077176

E-mail: [email protected]