Method for producing ammonium phosphate sulfate by S-NPK (Sulfur-Containing Nitrogen-Phosphorus-Potassium Compounds) device

Abstract

The invention relates to a method for producing ammonium phosphate sulfate by an S-NPK (Sulfur-Containing Nitrogen-Phosphorus-Potassium Compounds) device. The method comprises the following steps of: sufficiently mixing phosphoric acid obtained after tail gas washing with concentrated sulfuric acid in a hydrogen-potassium conversion tank; introducing a mixture of sulfuric acid and phosphoric acidinto a mixed acid storage tank; reacting the mixed acid with gas ammonia in a tubular reactor; neutralizing obtained slurry and concentrated sulfuric acid in a neutralizing tank; and finally carryingout slurry spraying and pelleting, drying and screening to obtain an ammonium phosphate sulfate compound fertilizer finished product, wherein the sulfuric acid is added into the system from two points respectively, and the total mass ratio of the added phosphoric acid (P2O5) to the added sulfuric acid is 1:(2.0-2.2). According to the method, the S-NPK device is used for producing the ammonium phosphate sulfate, so that the investment cost is lowered, the construction cycle is shortened, and the utilization ratio of the device is increased; and the diluted phosphoric acid, the concentrated sulfuric acid and the gas ammonia are directly taken as raw materials, so that the manufacture cost of the product is lowered, and the method has excellent economic and social benefits.

Description

technical field [0001] The invention relates to a process for making compound fertilizer by using S-NPK device, in particular to a process for making ammonium phosphate compound fertilizer by using S-NPK device. Background technique [0002] Ammonium Phosphate is also known as "Small Ammonium Phosphate". For crops with more sulfur, it can improve crop quality, increase crop yield, and increase the utilization rate of fertilizers. [0003] The traditional production process of ammonium sulphate compound fertilizer is made from market-bought ammonium phosphate monoammonium and ammonium sulfate as raw materials through physical stirring and mixing and then granulation. It is a physical method; with the development of the fertilizer industry and technological innovation, Many manufacturers use the existing DAP production equipment to transform and also use it to produce ammonium sulfophosphate and have achieved success. This process is a chemical synthesis method, but there are...

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Problems solved by technology

[0003] The traditional production process of ammonium sulphate compound fertilizer is made from market-bought ammonium phosphate monoammonium and ammonium sulfate as raw materials through physical stirring and mixing and then granulation. It is a physical method; with the development of the fertilizer industry and technological innovation, Many manufacturers use the existing DAP production equipment to transform and also use it to produce ammonium sulfophosphate and have achieved success. This process is a chemical synthesis method, but there are still some technical problems in this process, such as adding a large amount of water into the System to ensure thermal stability and slurry solid content stability, etc.

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