Aim: In this work, the effect of milling time on the mechanical alloying of the
mixture containing the magnetite concentrate and biomass waste was investigated.
Materials and Methods: The ore’s grade consisting of hematite and magnetite minerals was
increased from 49.87% Fe to 67.29% Fe using the low intensity wet magnetic separator.
Biomass waste which was supplied from ÇAYKUR black tea facilities, used as a carbon
source was subjected to carbonization processes at 800°C for 1440 min. After the carbonization
process, the carbon and sulphur contents of the biomass were measured as 94.68%
and 0.03%, respectively. For the mechanical alloying process, a mixture consisting of
magnetite concentrate with a grain size of -45 μm and biomass which was added two times
the amount of carbon required for the reduction of magnetite to metallic iron was used.
Result: After the mechanical alloying process which was carried out at different times, it
was observed in the particle size analysis that the particle size of 90% of the mixture was
reduced to about 4 μm. In SEM (Scanning Electron Microscopy) images, cube-like particles
along with the spherical particles were observed depending on the mechanical alloying
times. After 45 minutes of alloying, it was observed that the carbonized product milled together
with magnetite concentrate was partially integrated into the crystal structure.
Conclusion: The carbonized tea plant waste milled together with magnetite concentrate
was partially integrated into the crystal structure. And the mechanical alloying provide to
increase in the specific surface area in parallel with the grain size decrease in the study.
Thus, in the later stage of the study, the milled powder acquired more ability to react.