Energy-saving ammonium chloride wastewater freeze-concentration crystallizing system and technology thereof

Abstract

The invention relates to an energy-saving ammonium chloride wastewater freeze-concentration crystallizing system and a technology thereof. The system comprises a stock solution precooler, a freezing forced circulation heat exchanger, a freezing crystallization separator and a solid-liquid separation device which are connected in sequence, an ice crystal melting tank is connected between the freezing crystallization separator and the stock solution precooler, and the solid-liquid separation device is connected with the freezing forced circulation heat exchanger. The system is an energy-saving and emission-reducing apparatus, and has a high heat efficiency and a low power consumption; compared with an existing ammonium chloride evaporative crystallization technology, the technology of the invention has the advantages of low temperature and normal pressure conditions, no consumption of steam, reduction of the dependence on a boiler, reduction of pollutants, energy saving and environmentalfriendliness; and compared with conventional technologies, the technology provided by the invention has the advantages of realization of the continuous wastewater treatment effect, low energy consumption, freeness of steam consumption, few pollutants, greenness and environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of ammonium chloride wastewater treatment, in particular to an energy-saving ammonium chloride wastewater freezing concentration crystallization system and a process thereof. Background technique [0002] Water will produce a large amount of ammonium chloride wastewater in the industrial production of chemical fertilizers, electroplating, circuit boards, rare earths, and hydrometallurgy. This type of ammonium chloride wastewater has a high concentration and is difficult to treat. Improper treatment will cause a high degree of harm to the environment. . The ammonium chloride wastewater solution is acidic. During the conventional heating and hair growth process, with the volatilization of ammonia nitrogen, the acidity increases, and it is highly corrosive to metals such as carbon steel and ordinary stainless steel. If the ammonium chloride wastewater is discharged directly, it will Water bodies are polluted t...

AI Technical Summary

Problems solved by technology

The ammonium chloride wastewater solution is acidic. During the conventional heating and hair growth process, with the volatilization of ammonia nitrogen, the acidity increases, and it is highly corrosive to metals such as carbon steel and ordinary stainless steel. If the ammonium chloride wastewater is discharged directly, it will water pollution

Ammonia nitrogen is an important substance that causes water eutrophication and environmental pollution. If the concentration of ammonia nitrogen is too high, it will inhibit the natural nitrification of the water body, cause a decrease in dissolved oxygen in the water body, accelerate the eutrophication process of the water body, cause algae to multiply rapidly and reduce water quality. Class poisoning, thereby reducing the self-purification ability of the water body

[0003] At present, reverse osmosis and evaporative concentration cooling crystallization technologies are generally used for the treatment of ammonium chloride wastewater, which have problems such as high energy consumption, serious corrosion, and low product quality.

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