Ammonium sulfate commonly known as fertilizer powder, sulfuric acid and ammonia generated by the reaction of salt. The 20th century, 60 years ago is the main varieties of nitrogen fertilizer, but also to provide crop nutrients, one of the main sources of sulfur. Ammonium sulfate containing 21% N, 24% S. White or slightly yellow crystal, hygroscopicity is small, no caking, chemical stability, into the soil after the strong acid, Ammonium Sulfate suitable for application in alkaline soil.
At the end of the 19th century, ammonia was washed with sulfuric acid in Europe as a by-product of ammonium sulfate. Synthetic ammonia production after industrialization, it was a major ammonia processing products. Later, due to the rapid development of ammonium nitrate, urea, liquid ammonia direct fertilization, ammonium sulfate in the world's total nitrogen fertilizer production decreased to only a small proportion. Ammonium Sulfate Since the early 1970s, the yield (in N) is about 6Mt, most of which is a byproduct of coke oven gas, gas, sulfuric acid and caprolactam production. India and other countries with ammonium carbonate and gypsum reaction of ammonium sulfate.
Ammonium sulfate production methods are:
① neutralization of ammonia and sulfuric acid in the saturated mold (vacuum or atmospheric pressure) within the reaction, the formation of ammonium sulfate crystals, Ammonium Sulfate separated by a centrifuge, the filter cake was dried after the product, the mother liquor returned to the saturated mold. The reaction is a strong exothermic reaction, Ammonium Sulfate which is used to evaporate water from sulfuric acid or intentionally added to control the temperature. In the atmospheric saturated crystallizer, a large amount of air can be bubbled into the reaction mass to remove the heat of reaction. Sulfuric acid washing coke oven gas or ammonia in the ammonium sulfate method, Ammonium Sulfate also belong to the neutralization method.
② gypsum natural gypsum or by-product gypsum and ammonium carbonate solution to produce calcium carbonate precipitation and ammonium sulfate solution, the separation of calcium carbonate by filtration. Ammonium sulfate solution evaporation crystallization, filtration with a centrifuge, the filter cake by drying that product, the mother liquor back to the evaporator. In the absence of sulfur resources, Ammonium Sulfate but there are natural or by-product gypsum resources in the region, this method can solve the sulfuric acid production of sulfur resources, by-product of calcium carbonate can be used to produce cement. The disadvantage is high energy consumption. Ammonium Sulfate From the production of caprolactam and other production by-product of ammonium sulfate mother liquor, if necessary to produce solid products, the method with the latter part of the same process.
③ recovery of sulfuric acid from the production of sulfuric acid sulfuric acid ammonium sulfate washing with sulfur dioxide exhaust gas to generate ammonium sulfite and ammonium bisulfite solution, Ammonium Sulfate and then the solution with sulfuric acid acidification, the release of sulfur dioxide by liquid preparation of liquid sulfur dioxide products, Or return to the sulfuric acid plant acid, the remaining concentrated ammonium sulfate solution by evaporation crystallization products.
Ammonium sulfate is a colorless orthorhombic crystal, industrial products are white to light yellow crystals, soluble in water. Ammonium sulfate is mainly used as fertilizer, Ammonium Sulfate suitable for a variety of soil and crops. Can also be used for textile, leather, medicine and so on.
1 ammonium sulfate is mainly used as fertilizer, suitable for a variety of soil and crops.
2 can also be used for textile, leather, medicine and so on.
3 consumption of ammonium sulfate by industrial ammonium sulfate dissolved in distilled water, adding arsenic removal agent and in addition to heavy metal agent solution purification, filtration, evaporation and concentration, cooling crystallization, centrifugal separation, drying in the system. Used as a food additive, as a dough conditioner, yeast nutrient.
4 used in biochemical, salting out the common salt, Ammonium Sulfate can be salted from the upstream and other products from the fermentation and purification of protein and so on.
Ammonium sulfate operation Disposal and storage
Operation Notes: closed operation, local exhaust. Operators must be specially trained to strictly observe the operating procedures. It is recommended that the operator wear a self-priming filter dust mask, Ammonium Sulfate wear chemical safety glasses, wear toxics, and wear rubber gloves. Avoid dust. Avoid contact with acids and bases. Handling light to light unloading, to prevent damage to packaging and containers. Ammonium Sulfate Equipped with a leak emergency treatment equipment. Empty containers may be harmful residues.
Storage Precautions: Store in a cool, ventilated warehouse. Away from fire, heat. Should be separated from the acid, alkali, should not be mixed storage. The storage area should be equipped with suitable materials to contain spills.