One kind of double decomposition process in the production of potassium nitrate ammonium chloride effect forced circulation of three consecutive concentrated in vacuo and crystallization system processes

The present invention relates to a double decomposition method in the production of ammonium nitrate forced circulation of the continuous three-way concentrated in vacuo and crystallization system processes. The system includes a mixing chute connected in sequence, concentrating the preheater, three-way countercurrent apparatus was concentrated, chloride crystallizer, thick and centrifuges. Potassium nitrate and ammonium nitrate mixed liquor, at 20 ~ 45 ℃, the mixture becomes saturated ammonium compound; pre-heat the mixed material; material for three-way preheated concentrated aqueous material such concentrated controlling the mass content of 70 to 80%; material after crystallization was concentrated; the material enters after crystallization is thick, so that a thick mass of water coming out the control content of the material in 30 to 45%; the thick material is carried out centrifugal separation to obtain a solid chloride. The present invention employs a three-way countercurrent process The slurry was concentrated chlorine concentration, not only reduces the concentration temperature, the slurry reduce corrosion of equipment, but also a significant reduction in the amount of steam, energy consumption is reduced.