CRYOGENIC GRINDING APPARATUS AND PROCESS

摘要

A cryogenic grinding apparatus is provided. The apparatus includes a material charge, a low-temperature embrittling device for embrittling the charged ground material by supplying liquid low-temperature gas, a mill for grinding the low-temperature embrittled ground material in an atmosphere containing the low-temperature gas, and a separating device. The separating device has a wind classifier, a removal device to remove the ground material from the mill-output volumetric flow, and a directing device to feed the removed ground material into a classifier-input volumetric flow and to discharge excess mill-output gas of the mill-output volumetric flow. In addition, a cryogenic grinding process is provided in which the ground material is removed from the volumetric flow, excess grinding gas is discharged, removed ground material is feed into a classifier-input volumetric flow of a wind classifier and a classifier-input volumetric flow is classified for separating off a classifier-output volumetric flow containing the fine material.

主权项

1. A cryogenic grinding apparatus for producing fine material from a material to be ground comprising:
a material charge for charging the material to be ground; a low-temperature embrittling device connected to said material charge and configured for embrittling the charged material to be ground at a low temperature by supplying a liquid low-temperature gas; a mill connected to said low-temperature embrittling device and configured for grinding the embrittled material to be ground in an atmosphere containing the supplied liquid low-temperature gas; a separating device configured for separating the fine material from a mill-output volumetric flow leaving the mill; said mill-output volumetric flow containing the liquid low-temperature gas and ground material; said separating device including a wind classifier configured for separating off a classifier-output volumetric flow containing the fine material from a classifier-input volumetric flow containing the ground material; a removal device connected to the mill and configured for removing the ground material from said mill-output volumetric flow; and, a directing device configured for feeding the removed ground material into said classifier-input volumetric flow and to discharge excess mill-output gas of said mill-output volumetric flow.