A good nitrogen fertilizer (commonly known as fertilizer powder) is suitable for general soil and crops. It can make branches and leaves grow vigorously, improve fruit quality and yield, and enhance the resistance of crops to disasters. It can be used as base fertilizer, topdressing fertilizer and seed fertilizer. Ammonium chloride can be produced by double decomposition reaction with salt, ammonium alum can be produced by reaction with aluminium sulfate, and refractories can be made with boric acid, etc. The conductivity can be increased by adding electroplating bath. It is also a catalyst for food sauce color, a nitrogen source for cultivating yeast in the production of fresh yeast, an auxiliary dyeing agent for acid dyes and a deashing agent for leather. In addition, it is also used in beer brewing, chemical reagents and battery production. Another important role is to mine rare earths. Ammonium sulfate is used as raw material for mining. Rare earth elements in ore soil are exchanged by ion exchange. Rare earth ores are formed after removing impurities, precipitation, pressing and burning of leachate. It takes about 5 tons of ammonium sulfate for each ton of raw rare earth ores to be mined and produced.

There are many biological uses, mostly in protein purification process, because ammonium sulfate belongs to inert substance, which is not easy to react with other bioactive substances. It can protect protein activity to the greatest extent in the purification process. In addition, ammonium sulfate has excellent solubility and can form a high-salt environment for protein precipitation and post-purification. Continuous preparation for high salt purification. The solubility of ammonium sulfate at zero and 25 degrees at room temperature is quite different. The following is the molar concentration of ammonium sulfate at different saturation at two temperatures.