Ceramics particle

A spherical molding sand produced by a flame fusion method, wherein the spherical molding sand comprises MgO and SiO2 as main components, and has a MgO/SiO2 weight ratio of from 1.0:1 to 1.45:1, and an average particle size of from 0.001 to 1.5 mm, wherein the total amount of MgO and SiO2 in the spherical molding sand is 97% or more.

A spherical molding sand, wherein the spherical molding sand comprises MgO and SiO2 as main components, and has a MgO/SiO2 weight ratio of from 1.0:1 to 1.45:1, an average particle size of from 0.001 to 1.5 mm, and a spherical degree of 0.95 or more, and wherein the total amount of MgO and SiO2 in the spherical molding sand is 97% or more.

A method of producing a casting comprising

• preparing a spherical molding sand by a fusion flame method, wherein the spherical molding sand comprises MgO and SiO2 as main components, and has a MgO/SiO2 weight ratio of from 1.0:1 to 1.45:1, and an average particle size of from 0.001 to 1.5 mm,
• preparing a casting mold comprising said spherical molding sand, wherein the total amount of MgO and SiO2 in the spherical molding sand is 97% or more, and
• demolding said casting mold to produce a casting.

A method of producing a casting comprising:

• preparing a spherical molding sand, wherein the spherical molding sand comprises MgO and SiO2 as main components, and has a MgO/SiO2 weight ratio of from 1.0:1 to 1.45:1, an average particle size of from 0.001 to 1.5 mm and a spherical degree of 0.95 or more,
• preparing a casting mold comprising said spherical molding sand, wherein the total amount of MgO and SiO2 in the spherical molding sand is 97% or more, and
• demolding said casting mold to produce a casting.

A process for producing a spherical molding sand, wherein the spherical molding sand comprises MgO and SiO2 as main components, and has a MgO/SiO2 weight ratio of from 1.0:1 to 1.45:1, and an average particle size of from 0.001 to 1.5 mm, and wherein the total amount of MgO and SiO2 in the spherical molding sand is 97% or more, comprising the step of fusing in flame, powder particles comprising MgO and SiO2 as main components, and having a MgO/SiO2 weight ratio of from 1.0:1 to 1.45:1, and an average particle size of from 0.00 1 to 2 mm, wherein the total amount of MgO and SiO2 in the spherical molding sand is 97% or more, to form spherical particles.

A process for producing a spherical molding sand, wherein the spherical molding sand comprises MgO and SiO2 as main components, and has a MgO/SiO2 weight ratio of from 1.0:1 to 1.45:1, an average particle size of from 0.001 to 1.5 mm, and a spherical degree of 0.95 or more, and wherein the total amount of MgO and SiO2 in the spherical molding sand is 97% or more, comprising the step of fusing in flame, powder particles comprising MgO and SiO2 as main components, and having a MgO/SiO2 weight ratio of from 1.0:1 to 1.45:1, and an average particle size of from 0.001 to 2 mm, wherein the total amount of MgO and SiO2 in the spherical molding sand is 97% or more, to form spherical particles.

A casting mold comprising a spherical molding sand produced by a flame fusion method, wherein the spherical molding sand comprises MgO and SiO2 as main components, and has a MgO/SiO2 weight ratio of from 1.0:1 to 1.45:1, and an average particle size of from 0.001 to 1.5 mm, and wherein the total amount of MgO and SiO2 in the spherical molding sand is 97% or more.

A casting mold comprising a spherical molding sand, wherein the spherical molding sand comprises MgO and SiO2 as main components, and has a MgO/SiO2 weight ratio of from 1.0:1 to 1.45:1, an average particle size of from 0.001 to 1.5 mm, and a spherical degree of 0.95 or more, and wherein the total amount of MgO and SiO2 in the spherical molding sand is 97% or more.