This company wants to make steel and cement with solar power. Here’s how.

Grist
By Maddie StoneNov 26, 2019, 3:58 am253 pts
Many of the industrial processes underpinning modern civilization rely on dirty energy for the simple reason that it’s a great source of heat. To make steel, you need to smelt iron ore at 1,100 degrees C; to cook cement, your kiln needs to reach 1,450 degrees C. To form molten glass from silica, the heat must…

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