Division 13Production of magnesia

### Division 13—Production of magnesia 313 (1) The production of magnesia is the chemical and physical transformation of magnesite (magnesium carbonate (MgCO3)) into one or more of the following magnesia products: (a) caustic calcined magnesia that: (i) has a concentration of magnesium oxide (MgO) of at least 75%; and (ii) is burned between 650 °C and 1 200 °C; (b) deadburned magnesia that: (i) has a concentration of magnesium oxide (MgO) of at least 85%; and (ii) has grain density of 2.85 g/cm3 to 3.45 g/cm3; and (iii) is burned between 1 300 °C and 2 200 °C; (c) electrofused magnesia that: (i) has a concentration of magnesium oxide (MgO) of at least 90%; and (ii) has grain density of greater than 3.45 g/cm3; and (iii) is fused at temperatures higher than 2 750 °C. (2) The production of magnesia is specified as an emissions‑intensive trade‑exposed activity. (3) The production of magnesia is a highly emissions‑intensive activity. > Note: See Part 4. (4) For the production of caustic calcined magnesia, the basis for the issue of free carbon units is by a tonne of caustic calcined magnesia on a dry weight basis that: (a) has a concentration of magnesium oxide (MgO) of at least 75%; and (b) is produced by, or as part of, carrying on the emissions‑intensive trade‑exposed activity; and (c) is of saleable quality; whether or not it is later transformed into deadburned magnesia or electrofused magnesia. > Note: Saleable quality is explained in Part 2. (5) For the production of deadburned magnesia, the basis for the issue of free carbon units is by a tonne of deadburned magnesia on a dry weight basis that: (a) has a concentration of magnesium oxide (MgO) of at least 85%; and (b) has grain density of 2.85 g/cm3 to 3.45 g/cm3; and (c) is produced by carrying on the emissions‑intensive trade‑exposed activity; and (d) is of saleable quality. > Note: Saleable quality is explained in Part 2. (6) For the production of electrofused magnesia, the basis for the issue of free carbon units is by a tonne of electrofused magnesia on a dry weight basis that: (a) has a concentration of magnesium oxide (MgO) of at least 90%; and (b) has grain density of greater than 3.45 g/cm3; and (c) is produced by carrying on the emissions‑intensive trade‑exposed activity; and (d) is of saleable quality. > Note: Saleable quality is explained in Part 2.