The invention discloses a method for recycling saltpeter-production dead steam, which comprises the following steps of: 1, collecting the dead steam from a saltpeter
slurry barrel and waste incondensable gases discharged from I and II effect evaporating pot heating chambers in a closed
buffer tank; 2, performing heat exchange on fine saltpeter water by a
heat exchanger to preheat the fine saltpeter water to the temperature of between 50 and 60 DEG C; 3, discharging
condensed water after the heat exchange of the dead steam into a
wastewater tank, and then returning the
condensed water in the
wastewater tank into a mine to re-dissolve
sodium sulfate mineral substances; and 4, conveying the preheated fine saltpeter water into an evaporating pot through a
centrifugal pump to perform
evaporation, concentration and
crystallization, and then dehydrating, separating,
drying, screening and packaging to obtain an industrial
anhydrous sodium sulfate finished product. Because a waste dead steam heat source is used, the
heat exchanger performs heat exchange on the fine saltpeter water to ensure that the fine saltpeter water is heated to be 6 DEG C, and then the fine saltpeter water is evaporated in the evaporating pot, the waste saltpeter-production dead steam
heat energy is fully used, the energy expense is greatly saved, the zero
discharge of the waste gasses is basically realized, and thus, the aim of
energy conservation and
environmental protection is fulfilled and the
noise pollution is relieved.