Device and method for melting a substance with the occurrence of a low level of contamination

An apparatus for melting glass or glass-ceramic, comprising:

• a crucible;
• an emitting device for emitting electromagnetic radiation into a melt in the crucible so that the melt is heated by the electromagnetic radiation;
• and
• a mixing device being assigned to the crucible so that the melt can be mixed and/or homogenized while it is still in the crucible, wherein the mixing device introduces a first material to the melt to induce a substantially predefined motion in the melt.

An apparatus for melting glass or glass-ceramic, comprising:

• a crucible;
• an emitting device for emitting electromagnetic radiation into a melt in the crucible so that the melt is heated by the electromagnetic radiation;
• a mixing device being assigned to the crucible so that the melt can be mixed and/or homogenized while it is still in the crucible;
• and
• an agitator dissolved or melted in the melt.

An apparatus for melting glass or glass-ceramic, comprising:

• a crucible;
• an emitting device for emitting electromagnetic radiation into a melt in the crucible so that the melt is heated by the electromagnetic radiation;
• a mixing device being assigned to the crucible so that the melt can be mixed and/or homogenized while it is still in the crucible;
• one or more gas nozzles;
• and
• a device for punching through a solid skull layer on a base of the crucible.

A method for melting a glass or glass-ceramic in a melting crucible, the method comprising:

• emitting electromagnetic radiation into the melting crucible to form a melt of the glass or glass-ceramic;
• mixing or homogenizing the melt;
• and
• introducing a first material into the melt so that a substantially predefined flow motion is induced in the melt.

A method for melting a glass or glass-ceramic in a melting crucible, the method comprising:

• emitting electromagnetic radiation into the melting crucible to form a melt of the glass or glass-ceramic;
• mixing or homogenizing the melt;
• and
• introducing an agitator into the melt, the agitator dissolving when introduced into the melt.