The invention relates to compounds containing foundry sand and an additive containing cryolite.

The contents of fluorine and aluminium can be transferred to a process for the production of cryolite or similar compounds.

A solid material (12') circumscribing an anode system (10) in an electrolysis apparatus is made from a mixture of cryolite and/or alumina (A12O3), where the solid material (12') contacts and surrounds the anodes (14, 14').

The method involved the reduction of molten aluminium oxide in cryolite.

Then alumina and electricity are combined in a cell with a molten electrolyte called cryolite.

A protective film is created about the anode within a cryolite-based electrolyte during electrolytic production of aluminum from alumina.

The flux which is used for the welding process contains the cryolite, the baryum fluoride and a bromide of an alkaline metal.

The apparatus includes a continuous point feeder assembly (12) connected to the cell structure over an exposed peripheral portion of the cryolite bath.

Glass prostheses are made of cryolite glass (Na6Al2F12-additive).

In 1942, working in secret with two Americans, he outlined new deposits of cryolite in Greenland.

Materials for the production of primary aluminium — Dense refractory bricks — Determination of cryolite resistance

The invention relates to a method for controlling the AlF3 content in cryolite melts for aluminium reduction, during which the temperature of the melt is measured.

Materials for the production of primary aluminium — Dense refractory bricks — Determination of cryolite resistance

Materials for the production of primary aluminium - Dense refractory bricks - Determination of cryolite resistance

In other embodiments, the probe (2) also determines bath composition including bath cryolite ratio and alumina concentration.