Scientists of the Environmental Engineering Institute under the State Academy of Sciences have recently developed heatproof lags with the recycling technology.

Section Chief Kim Mun Nam says:

“In the past a lot of energy was consumed as the raw materials had to be calcinated in high temperature when making heatproof lags. So we accepted the non-calcination method. We had mostly used natural materials like vermiculite as starting materials in the past but later used a lot of wastes from the industrial production as main raw materials.”

Slag is an industrial waste used for production of the heatproof lags.

The new heatproof lags developed on the basis of the energy-saving and proenvironmental technology are in wide use at a number of industrial establishments of Korea including the Pyongyang Thermal Power Complex and the Songnam Coal-Mining Machine Factory.