balls when other variables are held at center level. The following
observations obtained from Figs. 5 and 6:
Increase of pH and solid content improved the mass loss of steel
balls. This is possibility attributed to the fact that increasing pH
caused to formation of the passive ferric oxide film. Ferrous oxide is
an insulator that prevents electron transfer, hindering corrosion
and the weight loss of metal (or ball). On the other hand, increasing
feed solids percentage increased the pulp viscosity which affected
the abrasion rate. At higher pulp viscosity, the motion of the balls
and the copper sulphide samples were reduced significantly. If the
pulp viscosity was too high, the balls and the sulphide samples
would be stuck on the mill shell, significantly reducing the abrasion
rate and at lower feed solids percentage; more oxygen will be
dissolved in the pulp. Dissolved oxygen in aqueous solution had
profound influence on the corrosion of metal. It was also seen that
pH and solid content had effects of linear and quadratic on wear
rate, respectively.
The wear rate increased with increasing the rotation speed of
mill in range investigated. According to Ref. [23]; this may be
caused by the fact that the balls are lifted higher at high rotation
speed and the balls have stronger impacts on the mill shell upon
falling on to the coupon, which increases the abrasive wear. It was
mentioned, if the rotation speed was close to or higher than the
critical speed, the wear rate was reduced significantly because the
media were held against the shell by centrifugal force and no
abrasive wear happened at this speed range.
It was observed that wear rate reduced with increasing the
charge weight of balls to a certain value and then with further
increasing enhanced.
It was obvious that wear rate decreased with increasing the mill
throughout. However this factor had the little influence on wear
rate. This behavior is attributed to the fact that increasing mill
throughout reduced the motion space of the balls, reducing the
contact chance between the balls and the mill shell
ลูกเมื่อตัวแปรอื่น ๆ ที่จะมีขึ้นในระดับศูนย์ balls when other variables are held at center level. The following
ต่อไปนี้เป็นข้อสังเกตที่ได้รับจากมะเดื่อ 5 observations obtained from Figs. 5 and 6:
การเพิ่มขึ้นของค่า Increase of pH and solid content improved the mass loss of steel
และปริมาณของแข็งที่ดีขึ้นการสูญเสียมวลของเหล็กลูก balls. This is possibility attributed to the fact that increasing pH
caused to formation of the passive ferric oxide film. Ferrous oxide is
an insulator that prevents electron transfer, hindering corrosion
and the weight loss of metal (or ball). On the other hand, increasing
feed solids percentage increased the pulp viscosity which affected
the abrasion rate. At higher pulp viscosity, the motion of the balls
and the copper sulphide samples were reduced significantly. If the
pulp viscosity was too high, the balls and the sulphide samples
would be stuck on the mill shell, significantly reducing the abrasion
rate and at lower feed solids percentage; more oxygen will be
dissolved in the pulp. Dissolved oxygen in aqueous solution had
profound influence on the corrosion of metal. It was also seen that
pH and solid content had effects of linear and quadratic on wear
rate, respectively.
The wear rate increased with increasing the rotation speed of
mill in range investigated. According to Ref. [23]; this may be
caused by the fact that the balls are lifted higher at high rotation
speed and the balls have stronger impacts on the mill shell upon
falling on to the coupon, which increases the abrasive wear. It was
mentioned, if the rotation speed was close to or higher than the
critical speed, the wear rate was reduced significantly because the
media were held against the shell by centrifugal force and no
abrasive wear happened at this speed range.
It was observed that wear rate reduced with increasing the
charge weight of balls to a certain value and then with further
increasing enhanced.
It was obvious that wear rate decreased with increasing the mill
throughout. However this factor had the little influence on wear
rate. This behavior is attributed to the fact that increasing mill
throughout reduced the motion space of the balls, reducing the
contact chance between the balls and the mill shell
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