Magnetizing roasting

Magnetic Roasting Fe20,3 -t- CO Fe304. Recovered magnetically. 

Magnetic Roasting Fe20s + CO => Fes04. Recovered magnetically. 

Key Words Oolimic Hematite, Magnetic Roasting, d mamics. Additive,... 

Thermodynamic Study of the Oolitic Hematite Magnetic Roasting... 

The research result of the thermodynamic study on the oolitic hematite magnetic roasting leads us to believe that the hematite is reacted as follows when the temperature is more than 570 C [7]. 

As shown in the Table 111, the Reaction equation 1 is easily react, even the equilibrium partial pressure 0(CO) is extremely small. Actually, it is a complete reaction irreversible chemical reaction, however, the equilibrium partial pressure 0(CO) of the reaction equation 2 and 3 are large under the condition of the temperature is 650°C-800°C. In order to guarantee the hematite not to over reduction to FeO, the CO concentration should be strictly controlled in the experimental process. The thermodynamic study of the oolitic hematite magnetic roasting indicates that the thermodynamic tendency is pretty dramatic if the hematite is reduced to the magnetite. 

As shown in the Figure 2 and Figure 3, F(R )=l-2/3R-(l-R) has a better linear relationship with time than F(R)=1-(1-R) when using both of them as ordinate and time as abscissa, which indicate that the dynamics of oolitic hematite magnetic roasting was controlled by the internal diffusion when we used the CO as reduction gas. 

Table IV. The Rate Constant and Diffusion Coefficient at Different Magnetic Roasting Temperature...

Bai LiNa,and Liu LiNa, an experimental research on magnetic roasting- low intensity magnetic separation of oolitic hematite, China Mining Industry, 2009, 3(18), 83-87... 

Gas 2-Reduoing valve 3-Flowmeter 4-Mixedgas 5-Thermooouple 6-Quartz tube 7-Charging position 8-Temperature controller 9-Eleotrio furnace Figure 1. Device of magnetic roasting... 

Through the experiment, high quality iron concentrate could be obtained via magnetic roasting - grinding and magnetic separation and acid leaching process. 

Keywords Pyrite cinder. Magnetic roasting. Lead removal. Acid leaching... 

---