Ball mill is the key equipment for grinding after the crushing process, which is
widely used in the manufacture industries, such as cement, silicate, new
building material, refractory material.
The efficiency of the early stages of
grinding in a ball mill is much greater than that for formation of ultra-fine
particles, so ball mills operate most
efficiently by making a coarse product, the fine fractions of this then are
being separated, and the coarse part being returned to the mill inlet.
The proportion of the mill-exit material returned to the inlet may vary from
10-30% when ordinary cement is being ground, to 85-95% for extremely fine cement
products. It is important for system efficiency that the minimum amount of
material of finished-product fineness is returned to the inlet. Modern
separators are capable of making a very precise size "cut" and contribute
significantly to the reduction of energy consumption, and have the additional
advantage that they cool both the product and the returned material, thus
Efficient closed-circuit systems, because of their
tight particle size control, lead to cements with relatively narrow particle
size distributions (i.e. for a given mean particle size, they have fewer large
and small particles). This is of advantage in that it maximizes the
strength-production potential the clinker, because large particles are inert. As
a rule of thumb, only the outer 7 μm "skin" of each particle hydrates in
concrete, so any particle over 14 μm diameter always leaves an un-reacted core.
However, the lack of ultra-fine particles can be a disadvantage. These particles
normally pack the spaces between the larger particles in a cement paste, and if
absent the deficit are made up with extra water, leading to lower strength. This
can be remedied by including 5% calcium carbonate in the cement: this soft
mineral produces adequate ultra-fines on the first pass through the mill.
machine is composed by feeding part, discharging part, turning part and driving
part (reducer, small driving gear, electric motor and electric control). The
quill shaft adopts cast steel part and the liner is detachable. The turning
gearwheel adopts casting hobbing process and the drum is equipped with
wear-resistant liner, which has good wear-resistance. The machine is with stable
and reliable working condition.
We provide Professional technology, excellent product quality and intimate
after-sales service when you purchase Mobile crushing station from our
company.As a professional mining machinery exporter, we will win your trust with
our delivery speed, Enterprises Credit and product quality.