Wear rate were strongly affected by ball type. The high carbon
chromium steel balls resulted in the fewer weight loss of balls.
Also, the predicted values of wear rate were obtained using the
model equation and were plotted versus experimental data which
are shown in Fig. 7. According to Fig. 7 and Table 5, predicted values
are in very good agreement with the measured values (R2 value of
0.9676, adjusted R2 value of 0.9603 and predicted R2 value of 0.93).
5. Conclusions
In this study, wear rate of steel balls within the grinding of
Sarcheshmeh copper sulphide ore was qualitatively investigated
using SEM/EDX analysis. Also, factors affecting the mass loss of balls
including pH and solid percentage of grinding environment,
throughout of mill, charge weight of balls, mill speed, grinding time
and type of steel balls were evaluated by using RMS model. The
major conclusions based on this paper can be summarized as
follows:
1) The SEM images of high carbon chromium steel balls were
compared with low alloy steel balls. The results displayed that
the corrosion of low alloy steelwas much more serious than that
of high carbon chromium steel under the same conditions. The
SEM/EDX analysis showed that the weight loss of balls is due to
pitting corrosion and abrasion. The corrosion products formed
from phases of Fe, O, S, Si and Cr. The low alloy steel balls that
depend on a passive film for corrosion resistance were especially
susceptible to pitting by local breakdown of the film at
isolated sites. In addition, the SEM images indicated that there
are fewer scratches and pits on low alloy steel ball surface.
2) Increase of pulp pH and solid content strongly reduced wear
rate of steel balls. It was observed that wear rate enhanced with
reducing the throughout and increasing the grinding time and
mill speed. In addition, the ball charge weight enhanced up to
certain value, the wear rate decreased and thereafter increased.
3) It was found that influence of factors affecting the wear rate of
steel ballswas in the order of ball type > solid percentage > pH >
solid percentage2 > charge weight2 > grinding time > rotation
speed of mill > throughout.
4) A mathematical model was also suggested for relationship between
operating important factors and wear rate of balls.
อัตราการสึกหรอได้รับผลกระทบอย่างรุนแรงจากประเภทลูก Wear rate were strongly affected by ball type. The high carbon
คาร์บอนสูงลูกเหล็กโครเมียมผลในการสูญเสียน้ำหนักที่น้อยลงของลูกนอกจากนี้คาดการณ์ค่าของอัตราการสึกหรอที่ได้รับโดยใช้สมการรูปแบบและพล็อตเมื่อเทียบกับข้อมูลการทดลองที่มีการแสดงในรูป 7. 7 ที่คาดการณ์ค่าอยู่ในข้อตกลงที่ดีมากกับค่าที่วัดได้( 0.9676 5 chromium steel balls resulted in the fewer weight loss of balls.
Also, the predicted values of wear rate were obtained using the
model equation and were plotted versus experimental data which
are shown in Fig. 7. According to Fig. 7 and Table 5, predicted values
are in very good agreement with the measured values (R2 value of
0.9676, adjusted R2 value of 0.9603 and predicted R2 value of 0.93).
5. Conclusions
In this study, wear rate of steel balls within the grinding of
Sarcheshmeh copper sulphide ore was qualitatively investigated
using SEM/EDX analysis. Also, factors affecting the mass loss of balls
including pH and solid percentage of grinding environment,
throughout of mill, charge weight of balls, mill speed, grinding time
and type of steel balls were evaluated by using RMS model. The
major conclusions based on this paper can be summarized as
follows:
1) The SEM images of high carbon chromium steel balls were
compared with low alloy steel balls. The results displayed that
the corrosion of low alloy steelwas much more serious than that
of high carbon chromium steel under the same conditions. The
SEM/EDX analysis showed that the weight loss of balls is due to
pitting corrosion and abrasion. The corrosion products formed
from phases of Fe, O, S, Si and Cr. The low alloy steel balls that
depend on a passive film for corrosion resistance were especially
susceptible to pitting by local breakdown of the film at
isolated sites. In addition, the SEM images indicated that there
are fewer scratches and pits on low alloy steel ball surface.
2) Increase of pulp pH and solid content strongly reduced wear
rate of steel balls. It was observed that wear rate enhanced with
reducing the throughout and increasing the grinding time and
mill speed. In addition, the ball charge weight enhanced up to
certain value, the wear rate decreased and thereafter increased.
3) It was found that influence of factors affecting the wear rate of
steel ballswas in the order of ball type > solid percentage > pH >
solid percentage2 > charge weight2 > grinding time > rotation
speed of mill > throughout.
4) A mathematical model was also suggested for relationship between
operating important factors and wear rate of balls.
การแปล กรุณารอสักครู่..
