Regeneration method of iron-chromium flow battery electrolyte

The invention relates to the technical field of electrolyte regeneration, in particular to a regeneration method of an iron-chromium flow battery electrolyte. The regeneration method comprises the following steps: S1, pumping an electrolyte to be regenerated into a gas-liquid reactor, and introducing hydrogen sulfide into the gas-liquid reactor, so that the pressure in the gas-liquid reactor reaches a target pressure; s2, starting a circulating pump of the gas-liquid reactor to perform a circular reaction, performing a reduction reaction on the electrolyte and hydrogen sulfide to reduce Fe < 3 + > in the electrolyte into Fe < 2 + >, and introducing H < + > and generating solid elemental sulfur at the same time; and S3, filtering the electrolyte treated in the S3, and removing solid elemental sulfur to obtain the regenerated electrolyte. According to the regeneration method, Fe < 3 + > in the electrolyte can be effectively reduced into Fe < 2 + >, H < + > lost by hydrogen evolution can be introduced into the e