Methods for preparing novel phosphate fertilizer containing sulfur, zinc, boron and/or magnesium medium trace elements

Abstract

The invention relates to methods for preparing novel phosphate fertilizer containing sulfur, zinc, boron and / or magnesium medium trace elements. By means of the methods, traditional ammonium phosphate is efficiently and rapidly upgraded into the novel phosphate fertilizer containing rich sulfur, zinc, boron and / or magnesium medium trace elements without inputting a lot of equipment or refitting existing compound fertilizer production equipment. The six different methods for preparing the novel phosphate fertilizer containing sulfur, zinc, boron and / or magnesium medium trace elements are provided. The methods have the advantages that the novel phosphate fertilizer of different gradients can be flexibly prepared by simply and rapidly upgrading ammonium phosphate, and the anti-caking function, high efficiency, economy and double-effect nutrient design are achieved.

Description

Technical field [0001] The present invention relates to a method for preparing a new type of phosphate fertilizer containing trace elements such as sulfur, zinc, boron and / or magnesium. Background technique [0002] Nitrogen, phosphorus and potassium are essential macroelements for plants. In addition, medium and trace elements have obvious synergistic effects on macronutrients and promote crop growth and metabolism. In the past few decades, traditional fertilization habits have over-relied on macronutrients and failed to replenish the soil with micronutrients removed from the soil by agricultural products in a timely manner, resulting in a serious lack of micronutrients in the soil. [0003] Currently, various types of fertilizers with added medium and trace elements are popular in the world, especially the demand for phosphate fertilizer products rich in sulfur, zinc, boron and magnesium. Traditional phosphate fertilizer products need to be transformed and upgraded to meet...

AI Technical Summary

Problems solved by technology

[0006] As we all know, most of the common ammonium phosphate production equipment is a single set of ammonium phosphate production equipment with a production capacity of 600,000 tons. The equipment is complex and large-scale, and it is impossible to adjust the equipment at will. Any equipment modification required for fertilizer upgrading will be difficult and costly.

[0007] At present, some phosphate fertilizer enterprises try to add medium and trace elements, such as zinc sulfate to increase the zinc content in ammonium phosphate, and sulfur coating to increase the sulfur nutrient content. The fertilizer efficiency is not good, that is to say, the fertilizer effect of the compound fertilizer containing medium and trace elements prepared by the above two methods is not obvious, and there is little difference in fertilizer effect from the fertilizer without adding medium and trace elements, and it is far from the fertilizer effect of similar imported fertilizers.

[0008] According to expert analysis, the reason is that in the process of fertilizer production and preparation, under the action of water and temperature, it will react with monoammonium phosphate or diammonium phosphate in the fertilizer system to form insoluble zinc phosphate, making zinc nutrient difficult to be absorbed by crops. Absorption: Elemental sulfur cannot be directly absorbed by crops. It needs to be oxidized by sulfur bacteria in the soil to sulfate radicals at a certain temperature, coated with sulfur, and melted into large pieces or lumps of sulfur. It is difficult to be oxidized, and the utilization rate of the season will decrease. Very low, it takes 3-5 years to be slowly oxidized, so it is difficult to exert the fertilizer effect in the short term