An excellent fertilizer, for general soil and crops, foliage make vigorous growth, improve fruit quality and yield, enhance crop resistance to disasters can be used for basic fertilizer, top dressing fertilizer and seed. With salt metathesis reaction was carried manufacturing ammonium chloride, ammonium alum and aluminum sulfate to generate action, together with boric acid and other manufacturing refractory materials. Added to the plating solution to increase conductivity. Food is also a catalyst of caramel, fresh yeast production in cultured yeast nitrogen, acid dyes help dyes, leather deliming agent. In addition, for beer brewing, chemical reagents and battery production. An important role is also rare earth mining, mining ammonium sulfate as raw materials, the use of ion exchange in the form of the mineral soil in the rare earth exchanged out, and then collect leachate impurity removal, sedimentation, pressing, after burning Serve rare earth ore