There are also many biological uses, mostly used in protein purification processes, because ammonium sulfate is an inert substance and is not easy to react with other biologically active substances. It can protect protein activity to the greatest extent during the purification process. In addition, ammonium sulfate is extremely soluble Well, it can form a high-salt environment to prepare for protein precipitation and subsequent high-salt purification. The solubility of ammonium sulfate at 0°C and 25°C at room temperature is quite different. The following is the molar concentration of ammonium sulfate at different saturations at two temperatures.
An excellent nitrogen fertilizer (commonly known as fertilizer powder), suitable for general soil and crops, can make branches and leaves grow vigorously, improve fruit quality and yield, and enhance crop resistance to disasters. It can be used as base fertilizer, topdressing and seed fertilizer. It can double decomposition reaction with salt to produce ammonium chloride, react with aluminum sulfate to produce ammonium alum, and make refractory materials together with boric acid. Adding to the electroplating solution can increase conductivity. It is also a catalyst for the color of food sauces, a nitrogen source for cultivating yeasts in the production of fresh yeasts, dyeing aids for acid dyes, and deliming agents for leather. In addition, it is also used in beer brewing, chemical reagents and battery production. Another important role is to mine rare earths. Mining uses ammonium sulfate as raw material, exchanges the rare earth elements in the mineral soil by ion exchange, and then collects the leachate to remove impurities, precipitate, squeeze, and burn it to become rare earth ore. 1 ton of rare earth ore requires about 5 tons of ammonium sulfate.