attrition milling process
Attrition grinding (autogrinding of particles by friction, impact and shearing). Item is ground between several rotor components and also the stator fitted having a lining. In mineral milling process, it offen used to grind Limestones, Carbonates, Talcum. Various types of attrition milling have been used across a wide range of industries and applications, such as paints, pigments, pharmaceuticals, ceramics and coal slurries. The attrition mill could possibly be considered on the other finish of the loose generic description of stirred media or stirred ball mills. Similarly, some have classified the ball mill as becoming inside the family members of attrition mills.
The tailoring in the mill style to the specific application could be crucial with attrition mills, as they operate at higher speeds, smaller volumes and greater localized power concentrations. This mill sort was chosen as an example of how mill system advancement, optional mill system arrangements and sparing philosophies can impact overall program design and method effectiveness.
Operating principle with the Attrition mills
The machine works along the same lines as the agitator mills. The vertical special agitator with self rotating hardened dot welded beaters is fitted with agitator shaft which are arranged in staggered positions one above the other and at a certain angle in relation to 1 another. The agitator runs in a con?tainer which could be cooled or heated, as necessary. Thus it is achievable to procedure high-viscosity/ abrasive/ hard solid supplies to grind 1 micron or less particles.
Attrition milling is batch operation where materials to be ground are fed in as a suspension or as single components. A built-in product discharge valve with screen enables the separation of item and grinding media.
The exchange in the grinding media is possible by a tilt mechanism. Size and material of the grinding media depend on the product to be processed.
Wet Attrition Milling Method For Limestone
During wet milling method of limestone, both limestone and water are continuously fed from the leading of the mill by means of a specially created feed housing. This funnel shaped housing has a cylindrical extension, which projects into the grinding vessel in the attrition mill. The shaft with the mill extends down through the housing and also the cylindrical extension with the media agitator arms getting disposed just beneath the extension. The rotating shaft utilizes several radially projecting, angled impeller blades, that are inside the cylindrical extension. When the shaft rotates, these blades produce a pumping action, which forces the limestone and water into the grinding media bed.