Process for purifying sodium sulfate and sodium carbonate from alkali furnace alkali ash

The invention discloses a process for purifying sodium sulfate and sodium carbonate from alkali furnace alkali ash. The process comprises the following steps: taking alkali furnace alkali ash as a rawmaterial, adding fresh water or a first nitro-alkali washing solution and a circulating salt dissolving mother solution into the alkali ash to dissolve sodium chloride and potassium sulfate in the alkali ash, thickening through a hydrocyclone, carrying out solid-liquid separation to obtain undissolved nitro-alkali containing sodium sulfate and sodium carbonate and a salt dissolving mother solution, and dividing the salt dissolving mother solution into a circulating salt dissolving mother solution and a discharged salt mother solution; adding fresh water and a second nitro-alkali washing solution into the undissolved nitro-alkali, and circularly stirring and washing; carrying out solid-liquid separation to obtain washed nitro-alkali and a nitro-alkali washing solution, wherein the nitro-alkali washing solution is