Prodn method of high azote, high potassium and sulfenyl 3-element compound fertilizer

Abstract

This invention relates to a method to produce high-nitrogen and high-potassium sulphur-based three-element composite fertilizers, which is attributed to composite fertilizer production in the field of chemical engineering. It mainly solves the problems existing in high-nitrogen and high-potassium sulphur-based three-element composite fertilizer production with current facilities and has the characteristics that, according to the low-chlorine ion and high-potassium specificity of potassium sulphate and the nutrient structure, a potassium sulphate melting groove is added based on current apparatus or small potassium sulphate particles as masterbatch are directly added at the granulator head at a certain ratio, and then spray granulation is carried out. In this method, only a small modification towards the apparatus and the technique is taken and no big investment is necessary. Products produced in this method have stable quality, easily adjustable structure, comparatively great nutrient with promoted nitrogen and potassium content. It provides mighty guarantee for development of domestic economics and nutrient demand of economic crops and expands new development path for domestic phosgene composite fertilizer industries.

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 sulfur-based ternary compound fertilizer. Background technique [0002] Chemical fertilizers refer to fertilizers made from minerals, air, and water through chemical or mechanical processing. They are developed on the basis of natural fertilizers. According to the results of the investigation by the Food and Agriculture Organization of the United Nations, the average yield increase effect of chemical fertilizers can reach 40-60%. Nitrogen, phosphorus, and potassium fertilizers are the three basic fertilizers in chemical fertilizers. [0003] Such as figure 1 The existing compound fertilizer production process is: KCI enters the reaction tank after being measured by a disc feeder and a screw meter; the sulfuric acid stored in the sulfuric acid tank is sent to the reaction tank in proportion to react with KCI to g...

AI Technical Summary

Problems solved by technology

In Northwest China, the effect of increasing the yield of food crops is still unstable, but in potassium-loving crops, such as cotton, potatoes, melons, fruits, vegetables, etc., increasing the application of potassium sulfate fertilizer has already had a significant effect on increasing yield.

[0006] In order to produce high-nitrogen and high-potassium compound fertilizers on the basis of existing equipment using existing processes, relevant domestic enterprises have conducted long-term research, but none of them succeeded.

The main difficulty is: the above-mentioned process is chemical synthesis granulation. If this process is used to produce compound fertilizers with high nitrogen and potassium content, the consumption of KCI and ammonia must be increased.

In practice, if the dosage of potassium chloride is increased, the chloride ion content of the finished product will exceed the standard due to the influence of the reaction conditions, which will not meet the product quality requirements

At the same time, it will have adverse effects on the neutralization reaction in the subsequent process, making the slurry difficult to granulate

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