The Hardinge mill see Fig 16 differs from most ball mills in that conical ends are added to the cylindrical portion of the mill The cone at the feed end has a larger open angle than that at theopposite end Its makers state that the large balls concentrate near the feed end of the mill where the coarsest ore collects and the smaller balls act on the finer ore.
Rod mills see Fig 17 follow the general dimensions of tube mills with diameters from 3 to 6 ft and lengths from two to three times their diameter They differ from ball mills in that steel rods 3 or 4 in shorter than the mill length inside the liners are used as grinding media Rod mills are often run on tires and rollers instead of trunnions or on one trunnion and one tire and set of rollers.
Low level discharge is obtained on Marcy rod mills by having a beveled annular ring at the discharge end A stationary steel door fits close to this beveled ring and serves to hold the rods in the mill while pulp discharges between the mill and the door.
The distinction between tube mills and ball mills is not somarked as their names indicate Mills from 4 to 6 ft in diameter and from 16 to 22 ft long are usually termed tube mills This was the first type of rotary mill for metallurgical purposes Because of the necessity of completing the grind during one passage open circuit of the ore through the mill it was built with a large length diameter ratio The tube mill is still largely used in South Africa and to some extent in North America for fine grinding generally following some other primary mills.
Tube mills are usually supported on hollow trunnions the feed entering through a feed scoop at one end and discharging through the other Drive is by a large gear fitted over the mill shell Various types of liners are used as in ball mills.
Vertical roller mills for iron ore grinding Vertical Roller Mill Working Principle There are many different forms of vertical mill but the working principle is basically the same All these forms of vertical roller mill with the grinding roller or the equivalent of grinding roller grinding parts grinding roll along the horizontal circular motion on the disc the vertical pressure exerted on the.
Vertical roller mill iron ore Research of iron ore grinding in a verticalrollermill The application of vertical roller mills VRMs for ore grinding is a part of the second strategy 1 In the mid 90s LOESCHE introduced its VRMs with the 22technology for grinding clinker and More Details Vertical roller mills for iron ore grinding.
Research of iron ore grinding in a vertical roller mill The application of vertical roller mills VRMs for ore grinding is a part of the second strategy 1 In the mid 90s LOESCHE introduced its VRMs with the 22 technology for grinding Grinding Mill kefid galini design Learn More About Kefid Machinery174 lm vertical mill 1 Low.
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