Process for producing crushed product, apparatus therefor and crushed product

A crushing apparatus comprising

• a pair of crusher discs arranged so as to define a crushing space in between confronting crushing faces thereof,
• a driving means for rotating one of the crusher discs,
• a cooling section for cooling the crusher discs,
• a raw material supply site for supplying one or more raw materials to the crushing space,
• a crushed product delivery site for bringing out the resulting crushed product thereto from the crushing space and
• an inert gas supply means for supplying a cooled inert gas to the crushing space
• wherein the crushing space comprises a rough crushing space for roughly crushing the raw materials into a roughly crushed product and a fine powder crushing space for finely crushing the roughly crushed product into micropowder, the rough crushing space being formed by a first set of grooves provided in the crushing faces of the crusher discs and the fine powder crushing space being formed by a second set of grooves provided in the crushing faces of the crusher discs which are shallower than the first set of grooves, the second set of grooves being in communication with the first set of grooves and consisting of thin arcuate grooves formed in a dense arrangement on the crusher discs to coincide with a flow line of the micropowder and extending continuously from an inner side to an outer side of the crushing faces of the crusher discs.

A crushing apparatus comprising

• a pair of crusher discs arranged so as to define a crushing space in between confronting crushing faces thereof,
• a driving means for rotating one of the crusher discs,
• a cooling section arranged adjacent to the other one of the crusher discs so as to cool it,
• a raw material supply site for supplying one or more raw materials to the crushing space through the cooling section,
• a crushed product delivery site for bringing out the resulting crushed product thereto from the crushing space and
• an inert gas supply means for supplying a cooled inert gas to the crushing space via the raw material supply site
• wherein the crushing space comprises a rough crushing space for roughly crushing the raw materials into a roughly crushed product and a fine powder crushing space for finely crushing the roughly crushed product into micropowder, the rough crushing space being formed by a first set of grooves provided in the crushing faces of the crusher discs and the fine powder crushing space being formed by a second set of grooves provided in the crushing faces of the crusher discs which are shallower than the first set of grooves, the second set of grooves being in communication with the first set of grooves and consisting of thin arcuate grooves formed in a dense arrangement on the crusher discs to coincide with a flow line of the micropowder and extending continuously from an inner side to an outer side of the crushing faces of the crusher discs.

A method for producing a crushed product, comprising the steps of:

• defining a crushing space in between crushing faces of a pair of confronting crusher discs;
• forming a rough crushing space for roughly crushing raw materials into a roughly crushed product in the crushing space by providing a first set of grooves in the crushing faces of the crusher discs;
• forming a fine powder crushing space for finely crushing the roughly crushed product into micropowder in the crushing space by providing a second set of grooves, which are shallower than the first set of grooves, in communication with the first set of grooves, consists of thin arcuate grooves formed in a dense arrangement on the crusher discs to coincide with a flow line of the micropowder and extend continuously from an inner side to an outer side of the crushing faces of the crusher discs, in the crushing faces of the crusher discs;
• rotating one of said confronting crusher discs by a driving means;
• cooling the other one of the crusher discs through a cooling section disposed adjacent thereto;
• supplying one or more raw materials to the crushing space from a raw material supply site through a cooling section;
• supplying one or more raw materials to the crushing space via the raw material supply site;
• effecting crushing of the raw materials under cooling thereof while replacing ambient oxygen on and around the raw materials by the insert gas;
• and
• bringing out the resulting crushed product from the crushing space to a crushed product delivery site.