Process for manufacturing agglomerated particles of tantalum, mixed tantalum powder and process for manufacturing same, tantalum pellet and process for manufacturing same, and capacitor

A process for manufacturing a mixed tantalum powder including the steps of:

• obtaining agglomerated tantalum particles (X) using the manufacturing process (a) described below;
• obtaining agglomerated tantalum particles (Y) using any manufacturing process among the manufacturing processes (b)-(d) described below;
• and mixing the resultant agglomerated tantalum particles (X) and agglomerated tantalum particles (Y),
• manufacturing process (a):
• a process for manufacturing agglomerated particles of tantalum including the steps of:
• obtaining hydrated aggregates by stirring secondary particles of tantalum produced by tantalum salt reduction while adding water thereto in a granulating apparatus provided with a low-speed impeller and a high-speed impeller rotating at a rotational speed that is at least 10 times higher than that of the low-speed impeller;
• further stirring the hydrated aggregates in the granulating apparatus without adding water;
• and, after that, obtaining dry aggregates by drying the hydrated aggregates, and sintering the dry aggregates,
• manufacturing process (b):
• a process for manufacturing agglomerated particles of tantalum including the steps of:
• obtaining hydrated aggregates by stirring secondary particles of tantalum produced by tantalum salt reduction while adding water thereto in a granulating apparatus provided with a low-speed impeller and a high-speed impeller rotating at a rotational speed that is at least 10 times higher than that of the low-speed impeller;
• and, after that, obtaining dry aggregates by drying the hydrated aggregates;
• spheronizing the dry aggregates by passing them through screens;
• and sintering the spheronized dry aggregates,
• manufacturing process (c):
• a process for manufacturing agglomerated particles of tantalum including the steps of:
• obtaining hydrated aggregates by adding water to secondary particles of tantalum produced by tantalum salt reduction and pulverizing them in a pulverizing machine other than the above granulating apparatus;
• and, after that, obtaining dry aggregates by drying the hydrated aggregates;
• spheronizing the dry aggregates by passing them through screens;
• and sintering the spheronized dry aggregates,
• manufacturing process (d):
• a process for manufacturing agglomerated particles of tantalum including the steps of:
• obtaining hydrated aggregates by adding water to secondary particles of tantalum obtained by tantalum salt reduction;
• and, after that, obtaining dry aggregates by drying the hydrated aggregates;
• obtaining sintered aggregates by sintering the dry aggregates;
• and micronizing the sintered aggregates.