# RD 735081
LIFTING SYSTEM AND A METHOD FOR REMOVING A STIRRING ASSEMBLY FROM A STIRRED GRINDING MILL
Publication date
20/06/2025
Language
English
Paper publication
July 2025 Research Disclosure journal
Digital time stamp
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
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Abstract

LIFTING SYSTEM AND A METHOD FOR REMOVING A STIRRING ASSEMBLY FROM A STIRRED GRINDING MILL Abstract The disclosure relates to a lifting system (100, 200, 300) for a stirring assembly (10) of a stirred grinding mill (1), wherein the stirring assembly (10) has a drive shaft (11) and a plurality of grinding rotor disks (12), said lifting 5 system (100), comprising: at least one lifting element (110, 210, 310) structured and arranged to be attachable to the drive shaft (11) of the stirring assembly (10) at a proximal end (111, 211, 311) thereof such that the at least one lifting element (110, 210, 310) extends radially outwardly from the drive shaft (11) from its proximal end (111, 211, 311) to a distal end (112, 212, 312) 10 thereof, wherein the at least one lifting element (110, 210, 310) comprises a lifting portion (113, 213, 313) arranged at the distal end (112, 212, 312). Elected for publication: Figure 5 1 LIFTING SYSTEM AND A METHOD FOR REMOVING A STIRRING ASSEMBLY FROM A STIRRED GRINDING MILL Field of the disclosure 5 The present disclosure relates to a lifting system for a stirring assembly of a stirred grinding mill. The present disclosure further relates to a method for removing a stirring assembly from a stirred grinding mill. Background art 10 A stirred mill, also known as attritor mill, is a type of mill used for grinding and mixing materials such as chemicals, ores, pyrotechnics, paints, and ceramics. It consists of a vertical vessel with a central shaft and impellers that stir the media in a specific pattern. Stirred bead grinding mills are typically used in mineral processing to 15 grind mineral ore particles into smaller sized particles to facilitate further downstream processing, such as separation of the valuable mineral particles from unwanted gangue. For example, mineral ore particles in the range of about 30µm to 4000µm in diameter may be ground down to particles of 5 to 100 µm in diameter. This process is commonly known as fine and ultra-fine 20 grinding. A stirred bead grinding mill typically has a stationary mill body or shell and an internal drive shaft. The shell and the drive shaft can be arranged vertically in the mill; this kind of mill is also known as a tower mill. The drive shaft has a plurality of stirring elements, such as rotor disks or rotors, so that 25 rotation of the drive shaft also rotates the stirring elements, which in turn stirs a suitable grinding media, and the mineral ore particles, in the form of a feed slurry, passes through this stirred bed of media. The resulting stirring action causes the mineral ore particles to be ground into smaller sized particles. In other words, in contrast to tumbling mills such as ball mills where motion is 30 imparted to the charge via the rotation of the mill shell, in tower and stirred mills motion is imparted to the charge by the movement of an internal stirrer while the shell remains stationary. 2 Exemplary stirred bead grinding mills are known from WO 2017/017315 A1 and WO 2018/138405 A1. A challenge with the stirred mills in general is lifting or moving the drive shaft from its position in the mill due to maintenance or replacement of the 5 drive shaft itself, the stirring elements or the like. There is thus a need in the art for an improved solution where the drive shaft is able to ...