used ball mills open grate discharge

Ball Mills

2017-2-13 · where an approximate figure for the constant is 3.5 for rod mills, 4.0 for overflow ball or pebble mills and 4.5 for grate discharge ball or pebble mills. ç is specific gravity of grinding media (for rods or balls normally 7.85) q is the charge volume in fraction of mill volume (40 % = 0.40) nc is the mill …

Overflow VS Grate Discharge Ball or Mill

2015-6-24 · Allow me to compare: Ball mills can be of the overflow or of the grate discharge type. Overflow discharge mills are used when a product with high specific surface is wanted, without any respect to the particle size distribution curve.Overflow discharge mills give a final product in an open …

Horizontal Grinding Mill Overflow Type, Grate-discharge ...

The grate-discharge type of Ball Mill has a grate at the outlet of the shell and causes less excessive grinding, compared to the overflow type. Therefore, generally, it is best suited to grind materials up to the particle sizes ranging from 60 to 100 mesh.

Grate discharge ball mill | Henan Deya Machinery Co., Ltd.

2021-8-19 · Grate ball mill discharge side cover 1.Grate liner 2 aring inner sleeve 3.Quill shaft 4.Skip-shape liner 5.Central liner 6.Steel bars 7.Drill key. Different of feeding device of grate ball mill. 1. The feeders of ball mill are: drum type, worm type and combined type, and their structures are shown as (a), (b) and (c) in the figure.

Grate Discharge Advantage & Benefits

2021-8-30 · As secondary ball mills are usually fed a relatively (compared to SAG mills) fine F80 and have high re-circulating loads and produce product fineness of the P80 - 100 to 160 micron range, fitting a grate discharge needs to be carefully considered.

Grinding Mills

2016-10-20 · Ball mills can be of the overflow or of the grate discharge type. Over­ flow discharge mills are used when a product with high specific surface is wanted, without any respect to the particle size distribution curve. Over­ flow discharge mills give a final pro­ duct in an open circuit. Grate dis­ charge mills are used when the PEBBLE MILLS

Ball mills

Outotec has designed, manufactured and installed over 8,000 ball and pebble mills all over the world for a wide range of applications. Some of those applications are grate discharge, peripheral discharge, dry grinding, special length to diameter ratio, high temperature milling oprations and more.

Ball Mill

2021-1-25 · Grate Discharge Ball Mill Used in wet and dry grinding in both open and closed circuits, a grate discharge ball mill (sometimes known as a ''diaphragm discharge mill'') incorporates a slotted discharge diaphragm with lifters at the discharge end of the mill. The diaphragm, or ''grate'', serves to retain the balls and any coarse material,

Converting a ball mill from overflow to grate discharge ...

2020-6-23 · Converting a ball mill from overflow to grate discharge involves installing a grate inside the mill at the discharge end. The grate holds the balls inside the mill but allows the slurry to pass through, and it is then pumped out of the mill by the pulp lifters. This is different to an overflow mill which holds the slurry and balls inside until ...

Analysis of specific discharge rate functions in ...

2015-4-1 · According to Leung''s definition, the discharge rate is considered to be the product of two mechanisms, transport and classification by the grate. if there is not any particle classification at the mill discharge, particles behave like water and the discharge function is invariant with particle size as stated by Morrell and Man (1997).However, discharge rate decreases rapidly …

Horizontal Grinding Mill Overflow Type, Grate-discharge ...

Ball Mills - Mineral Processing & Metallurgy

Improved Relationships for Discharge in SAG/AG Mills

2019-10-9 · of grate/pulp lifter design in AG/SAG mill discharge. The current understanding from literature lacks knowledge of mill content size distribution and its effect on discharge through the grate at various aperture sizes and radial positions. It also indicates that in