initial melt造句

In the past it was widely used to produce uranium glass or vaseline glass, the sodium salt dissolving easily into the silica matrix during the firing of the initial melt.
Within the Murmansk block, from west to east, there is an increase in the rare earth elements ( REE ) content in the initial melts, a change in composition of protoliths from tholeiite with the highest content of REE to subalkaline basalt, and in the eastern part of the Murmansk block the REE content is even higher.
It's difficult to find initial melt in a sentence. 用initial melt造句挺难的