1980
The white-hot interior of a rotary cement kiln, orange fire around a dark burner pipe.
The company
Canada Cement Lafarge made Portland cement and concrete products. Canada Cement was put together in 1909 from ten cement firms, including the Exshaw, Alberta, plant (built 1906). In 1970 it combined with Lafarge Canada and took the Canada Cement Lafarge name, with plants across the country.
Canada Cement Lafarge Ltd. Annual Report 1980, inside front cover
That year
Inside a rotary kiln, temperatures reach 1,350°C (2,460°F) to produce the chemical change required in making cement.
Canada Cement Lafarge Ltd. Annual Report 1980, inside front cover
Source
archive.org/details/McGillLibrary-637702-29084
Other years 1981