Molten silicon? What could go wrong.
Molten silicon is not explosive or particularly flammable. Its a metaloid that when exposed to air will oxidize back to the silicon teraoxide that was the original source of the silicon. SIO4 is commonly referred to as quartz sand one of the most abundant and chemically stable compounds on earth. This is all hyperbole as the system is sealed and only the heat is used across sealed heat exchangers. People deal with large quantities of much more reactive molten metals every day all over the world on a scale of hundreds of millions of tons per year mainly aluminum, magnesium, sodium, lithium all those metals are produced as molten in multiple tons per run quantities. Humans mastered dealing with molten metals in the bronze age before Christ was born.