Method for producing nitro-sulfur-based composite fertilizer by full-liquid phase high tower granulation

Abstract

The invention discloses a method for producing nitro-sulfur-based composite fertilizer by full-liquid phase high tower granulation. The method comprises the following steps of: reacting solid potassium chloride and concentrated sulfuric acid to prepare a potassium bisulfate solution of which the concentration is 94 to 96 percent; producing an ammonium nitrate solution of which the weight concentration is 93 to 95 percent; filling the potassium bisulfate solution and the ammonium nitrate solution into a middle groove of a granulation high tower through a dedicated conveying pipe by a pump provided with a metering device according to the amount; filling ammonia gas into the mixed solution of the potassium bisulfate and ammonium nitrate in the middle groove to adjust the pH value of the mixed solution until the solution is neutral; and pumping the mixed solution in the middle groove into a secondary evaporator on the granulation high tower through a middle pump to obtain the mixed solution of which the water content is less than or equal to 0.5 percent, wherein the mixed solution flows into a fusing groove and then enters a granulator from the fusing groove, and a nozzle of the granulator rotates to spray granules. The method is simple and convenient in technique and low in production cost, and can prepare the high-grade fertilizer which is high in purity and is completely water soluble.

Description

technical field [0001] The invention relates to a production method of nitrosulfur-based compound fertilizers, in particular to a method for producing nitrosulfur-based compound fertilizers through full-liquid-phase high-tower granulation. Background technique [0002] At present, the existing methods of producing nitrogen- and potassium-containing compound fertilizers using high-tower granulation technology include: (1) Put liquid ammonium nitrate in the middle tank of the high-tower, and then enter the melting tank after evaporating water through the second-stage evaporator, and solid sulfuric acid Potassium is lifted up the high tower by the bucket elevator, enters the small silo, and then enters the mixing tank after being metered by the quantitative belt, mixes with the liquid ammonium nitrate from the melting tank, and then enters the granulator, and is sprayed out naturally by the rotating nozzle. Drop to the silo under the tower to make finished pellets. (2) The ure...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for the production of nitrosulfur-based compound fertilizers by full-liquid phase high-tower granulation, so as to solve the problems in the prior art that the production process is complicated, the cost is high, the operating environment is poor, and the materials are unevenly mixed. Preparation of water-soluble high-end nitrosulfur-based compound fertilizer with high purity and uniform content