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Ammonium sulfate is widely used in industry, usually white or light gray-yellow granules. Soluble in water, insoluble in ethanol, acetone, ammonia, deliquescent, mainly used as a fertilizer, and is applicable to a variety of soils and crops, but also for the textile, leather, medicine and so on. Consumption of ammonium sulfate was added by industrial ammonium sulfate dissolved in distilled water, in addition to arsenic and in addition to the heavy metal agent solution purification, filtration, evaporation, cooling and crystallization, centrifugation, drying. The multi-effect evaporation as a result of evaporation, has in many industrial applications, but less used in the production of ammonium sulfate. Using the multi-effect evaporator can make full use of heat, i.e., through the evaporation process, the secondary steam recycling, in order to reduce the consumption of the generated steam, thus improving the economy of the evaporation apparatus. Panzhihua, Sichuan Ya Xin Pigment Co., black iron oxide in the production process, resulting in a large number of iron ammonium sulfate waste and wash water, iron, sulfate, ammonium ion recovery purification, filtration, evaporation, separation, and then concentrated energy saving and emission reduction, and finally dried to obtain ammonium sulfate crystals, black iron oxide production process will play an important role. The first multi-effect evaporation theory, the application of the domestic and international multi-effect evaporation and multi-effect evaporation compared with other forms of evaporation. Studies have shown that multi-effect evaporation energy-efficient than the other forms of evaporation. Secondly, the multi-effect evaporator applications in the feasibility of the ammonium sulfate production process were analyzed. Consider various influencing factors, the choice of the optimal number of effects are discussed in the theoretical analysis of the performance of multi-effect evaporation. In addition, the thermal performance of the multi-effect downstream evaporation system thermal design and calculation, application of C language programming. Countercurrent multi-effect downstream evaporation system with multi-effect evaporation system selection, the comparative study of the four-effect downstream and three-way down the river system, and combined the Sichuan Panzhihua Yahsin, Pigment Co., iron oxide black production process of the actual situation, according to multi-effect evaporation process is characterized by multi-effect evaporator used in the recovery of iron oxide black filtrate ammonium sulfate process, take full account of energy-saving measures on the basis of the choice of multi-effect evaporation system are discussed, the traditional multi-effect evaporator The system has been improved; vacuum pump selection and application of multi-effect evaporation system; drying solution of ammonium sulfate crystals are discussed; Finally, the ammonium sulfate in the multi-effect evaporation system recovery black iron oxide filtrate economic and social effectiveness analysis.
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