Production method for ammoniated sulfur-based compound fertilizer by chemical synthesis

Abstract

The invention relates to a production method for ammoniated sulfur-based compound fertilizer by chemical synthesis, comprising the following steps: generating potassium bisulfate by the reaction of sulfuric acid and potassium chloride; mixing phosphoric acid and potassium bisulfate to generate a mixed acid; adding ammonia into the mixed acid to be pre-neutralized; neutralizing the pre-neutralizedslurry with the ammonia; atomizing to spray the slurry by heat released by neutralization; and spraying slurry, introducing in ammonia and pelleting by adding urea. According to the product produced by the technology, the nitrogen content of the compound fertilizer can be improved by above 4%, and the compound fertilizer has small possibility of blocking; in addition, the amount of potassium can be kept to be above 14.5%; the compound fertilizer which contains 48% total nutrition and over 14.5% of each single nutrition, can satisfy nitrogen16-phosphorus 16-potassium 16 marking requirements and conforms to the national standard is obtained; and in addition, the mixed acid is neutralized for several times, the soil is not acidized or hardened after the produced compound fertilizer is applied.

Description

technical field [0001] The invention relates to a production method of compound fertilizer, in particular to a production method of high-nitrogen and high-potassium chemically synthesized sulfur-based compound fertilizer, which can completely produce nitrogen 16-phosphorus 16-potassium 16 total nutrient 48% variety of sulfur-based compound fertilizer . Background technique [0002] At present, general chemically synthesized compound fertilizers are produced by the reaction of phosphate rock and sulfuric acid to generate dilute phosphoric acid, and then mixed with potassium bisulfate, the reactant of potassium chloride and sulfuric acid, in a certain proportion to obtain mixed acid, which is then mixed with acid and ammonia in a neutralization reactor. Neutralization is carried out, and the generated slurry enters the granulator for atomization and is sprayed onto the material curtain to form compound fertilizer particles. The compound fertilizer produced by this method has c...

AI Technical Summary

Problems solved by technology

[0002] At present, general chemically synthesized compound fertilizers are produced by the reaction of phosphate rock and sulfuric acid to generate dilute phosphoric acid, and then mixed with potassium bisulfate, the reactant of potassium chloride and sulfuric acid, in a certain proportion to obtain mixed acid, which is then mixed with acid and ammonia in a neutralization reactor. Neutralization is carried out, and the generated slurry enters the granulator for atomization and is sprayed onto the material curtain to form compound fertilizer particles. The compound fertilizer produced by this method has certain defects: 1. The nutrient content of the compound fertilizer generally does not exceed 46%, and the label is 45% %, less than 48% of total nutrients (nitrogen 16~phosphorus 16~potassium 16); 2. The nitrogen content is difficult to increase due to the limitation of production conditions; although compound fertilizer manufacturers can use methods such as spraying urine on the finished compound fertilizer to Increase the nitrogen content to a certain extent, but there are also defects that the compound fertilizer is easy to agglomerate and pulverize; and the nitrogen utilization rate of the compound fertilizer produced by this method is low, generally around 80%

3. When the compound fertilizer increases nitrogen, the potassium content drops by a large margin, and it is difficult to control it to more than 14.5%.

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