"solid ice" is correct and usable in written English.
You could use it in a sentence to describe an object or location, such as: He had to travel over solid ice to reach the other side of the lake.
If it were any colder, it would be solid ice.
Glaciers are accumulations of snow transformed into solid ice.
Rock and solid ice are poor electrical conductors, but a salt-water ocean would be perfect.
Freezing rain struck the northern Midwest, coating roads and pavements with solid ice.
But last week, it was solid ice, and the bench was covered with snow.
Nilsson knew a guy who'd be making them plates out of solid ice.
A diffuse propane flame, it turns out, is no match for thick, solid ice.
But that route was solid ice and, as someone who uses a cane, she was, she said, traumatized.
In other words, there must be some solid ice left underneath to lift up and form the peak.
From the absorption of light by the specks, the scientists deduced that the chunks were not solid ice.
