Production process of temperature-controlled cyclic layer-by-layer sodium nitrate separation

The invention discloses a production process of temperature-controlled cyclic layer-by-layer sodium nitrate separation. The production process comprises the following steps: soaking nitronatrite ore with water to form a three-salt system liquid of sodium chloride NaCl, sodium nitrate NaNO3 and sodium sulfate Na2SO4; producing sodium chloride by low-temperature salt slurry whirl in the heating treatment process; extracting sodium sulfate from high-temperature salt slurry by virtue of a liquid-liquid separator; and returning a mother liquid to an evaporation system to use in cycle, and gradually separating and washing a salt slurry separator, so that heat energy is reduced; the water consumption is reduced; industrial pollution is reduced; the production process is mainly applied to comprehensive utilization of nitronatrite ore resources; production of the sodium nitrate is achieved; by-production of the sodium chloride and the sodium sulfate is achieved; waste salt is divided into two products, namely the sodium sulfate and the sodium chloride, so that the production value is increased; and the comprehensive economic benefits are improved.