Method for measuring content of ferrous sulfate in pressurized oxidizing slag and cyanide slag of gold mine

The invention relates to a method for measuring the content of ferrous sulfate in pressurized oxidizing slag and cyanide slag of a gold mine. The method is implemented through different phases. The method includes the following steps that: gypsum is selectively dissolved, sodium chloride or carbonic acid is added to the pressurized oxidizing slag and cyanide slag of the gold mine, shaking and leaching are carried out, so that a residue A is obtained; add sodium hydroxide or potassium hydroxide is added to the residue A, so that alkali dissolution leaching is carried out, filtering and washingare carried out, so that a filtrate B is obtained; after the filtrate B is acidized, barium chloride is added, so that precipitation can be carried out, and an obtained liquid stands still for 4h, filtering is carried out, and an obtained residue is calcined until the weight of the residue is constant, and barium sulfate is obtained, and the weight of the barium sulfate is measured; and the molecular formula of ferrous su