Crystalline silica particulate material and production process for the same as well as crystalline silica particulate material-containing slurry composition and crystalline silica particulate material-containing resinous composition

A crystalline silica particulate material, containing aluminum (Al) in an amount of less than 200 ppm, containing zinc (Zn) in an amount of 1 ppm or more, exhibiting a volume average particle diameter of 200 μm or less, exhibiting a circularity degree of 0.9 or more, and composed mainly of crystalline silica.

A crystalline silica particulate material, containing zinc (Zn) in an amount of 1 ppm or more, exhibiting a volume average particle diameter of 200 μm or less, exhibiting a circularity degree of 0.97 or more, composed mainly of crystalline silica, and exhibiting a crystallization degree of 80% or more.

A production process for crystalline silica particulate material, the production process comprising:

• an adhesion step of adhering zinc, or a compound containing zinc, onto a surface of a particulate ingredient comprising amorphous silica and exhibiting a circularity degree of 0.9 or more;
• and
• a crystallization step of subsequently heating the particulate ingredient undergone the adhesion step at a temperature of from 1,000° C. to 1,500° C., thereby crystallizing the particulate ingredient in an amount of 50% by mass or more while keeping up the circularity degree at 0.9 or more.

A production process for crystalline silica particulate material, the production process comprising:

• a preparation step of preparing a particulate ingredient comprising amorphous silica, containing zinc and exhibiting a circularity degree of 0.9 or more;
• and
• a crystallization step of subsequently heating the prepared particulate ingredient at a temperature of from 1,000° C. to 1,500° C., thereby crystallizing the particulate ingredient in an amount of 50% by mass or more while keeping up the circularity degree at 0.9 or more.