Refining method for efficiently smelting low-sulfur steel with low cost

The invention relates to a refining method for efficiently smelting low-sulfur steel with low cost, and belongs to the technical field of low-sulfur steel smelting. The desulfuration process of the low-sulfur steel is manly focused on steel ladle refining, steel ladle refining is carried out through researched and developed novel manganese-containing desulfuration synthetic slag, and the aims of efficient desulfuration, directly alloying of manganese ores and the like can be achieved. The specific process method comprises the steps that the desulfuration synthetic slag is pre-added into the bottom of a refining steel ladle in the steel tapping process of an electric furnace or a converter; after the refining process is started, heating, aluminum adding and deoxidation are carried out, thenthe residual desulfuration synthetic slag and SiC particles are added, and finally a manganese alloy is added for finely adjusting the alloy ingredient. According to the refining method, the refiningtime is shortened by 3 mi