Fig. 1. Digital photo and XRD of nickel slag

Fig. 2. Polishing device of MCF polishing process

Fig. 3. Experimental process

Fig. 4. Schematic diagram of measurement points and infrared temperature measurement in the polishing area

Fig. 5. Changes in MCF morphologies， surface roughness， decrease rate， and material removal rate with polishing time

Fig. 6. Changes in the temperature and normal force of MCF with time

Fig. 7. Distribution images of abrasive particles before and after polishing and particle size at different times

Fig. 8. Distribution images of α-cellulose before and after polishing and α-cellulose lengths at different times

Fig. 9. Changes in surface roughness， decrease rate， material removal rate， and MCF morphologies with polishing time after adding solution

Fig. 10. Changes in the temperature and normal force of MCF with time added solution

Fig. 11. Changes in surface roughness， decrease rate， material removal rate， and MCF morphologies with polishing time after adding supplementary solution

Fig. 12. Changes in MCF normal force with and without the addition of supplementary solution

Fig. 13. Surface roughness and material removal rate of MCF after long-term polishing

Fig. 14. Temperature changes of MCF during long-term polishing