what is the likelihood of damamge using deicing salts on concrete as well as flagstone steps and mortar

My husband is still recovering from an awful fall on the flagstone steps and walk splitting his scalp and requiring 6 staples as well as seven, yes, seven (7) fractured ribs. What do you suggest for making one's driveway safer to walk on after having shoveled as well as before the snow falls? The flagstone stoop and walk is seven years old. I have deicing salt but am wary about its use because it may damage the flagstone and mortar as well as the concrete driveway.

Thank you in advance.

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