1. A PROCESS FOR PRODUCING STRONTIUM-CONTAINING FERROSILICON HAVING A LOW CALCIUM CONTENT WHICH COMPRISES SMELTING IN A SUBMERGED ARC FURNACE A MIXTURE OF QUARETZITE, CELESTITE AND CARBONACEOUS REDUCING AGENT TO PROVIDE AN ALLOY CONTAINING 15 TO 55% STRONTIUM AND 40 TO 75% SILICON, THE STRONTIUM TO CALCIUM RATIO IN THE CELESTITE BEING AT LEAST 10:1; AND SUBSEQUENTLY ADDING THE AFORESAID ALLOY TO MOLTEN FERROSILICON CONTAINING AT LEAST 98.5% FE+SI, THE AMOUNT OF ALLOY ADDED BEING SUFFICIENT TO PROVIDE A STRONTIUM CONTENT OF AT LEAST 0.5%