A preparation method for a long-acting slow-release chlorine-based nitrogen and potassium-containing compound fertilizer

Abstract

The invention provides a preparation method for a long-acting slow-release chlorine-based nitrogen and potassium-containing compound fertilizer. The compound fertilizer belongs to mixed fertilizers containing substances affecting nitrification of ammonium-containing compounds or urea in soil, and is characterized by being prepared by: first preparing chlorine-based nitrogen and potassium-containing compound fertilizer granules, and then performing primary coating and a secondary surface powder putting by using a modified zeolite powder to the chlorine-based nitrogen and potassium-containing compound fertilizer granules by using stearic acid; wherein: the chlorine-based nitrogen and potassium-containing compound fertilizer is prepared from the following raw materials, by weight: 30-60 parts of urea, 10-20 parts of ammonium chloride, 22-53 parts of potassium chloride, 7-11 parts of granulating aids, and an appropriate amount of water. Provided is a preparation method by using which a long-acting slow-release chlorine-based nitrogen and potassium-containing compound fertilizer having good slow-release effect and high fertilizer utilization rate can be produced, wherein the elemental chlorine in the compound fertilizer can play a full role in the growth of crops, the process is simple, the production cost is low, and coating materials are easy to be degraded in the soil by microbes, which is beneficial to soil, air and water environmental protection. The long-acting slow-release chlorine-based nitrogen and potassium-containing compound fertilizer has a good sustained-release effect, and high fertilizer utilization rate, suitable for applying to various crops.

Description

technical field [0001] The invention relates to a preparation method of a slow-release and long-acting chlorine-based nitrogen-potassium compound fertilizer. Composts that contain substances that affect the digestion of ammonium compounds or urea in the soil. Background technique [0002] Compound fertilizers with a chloride ion content of more than 3% are called chlorine-based compound fertilizers, because chlorine-based compound fertilizers have a negative impact on the growth of certain chlorine-avoiding crops, and the concentration of chloride ions in the soil remains in large quantities, which can easily cause soil compaction, salinization, alkalization. [0003] Therefore, in some populations, there is a technical bias for the application of chlorine-based fertilizers. Worried that the application of chlorinated fertilizers will have adverse effects on crop yield and quality, so they simply refused to use chlorine-based fertilizers because of choking. The developmen...

AI Technical Summary

Problems solved by technology

However, during the use of urea, it is easy to lose through volatilization, leaching, decomposition and runoff, resulting in low fertilizer utilization rate. According to statistics, the seasonal utilization rate is only about 30%, which not only causes waste of chemical fertilizers, but also Pollution of air, water, soil and other environments on which human beings depend

The nutrient utilization rate of chlorine-based compound fertilizers in the prior art is only 25%-35%, and the utilization rate of nitrogen fertilizer is less than 30%, and the loss is particularly serious

Firstly, the high-tower granulation urea compound fertilizer granules are prepared by the high-tower granulation device, and then the urea compound fertilizer granules are first coated with paraffin and the surface of the modified zeolite powder is coated twice. The disadvantage is that the high-tower granulation High equipment investment costs, paraffin is a non-renewable fossil resource, and it is not easy to degrade in the soil

Resin coatings are expensive and do not degrade easily in soil

[0013] The preparation method of slow-release long-acting chlorine-based nitrogen-potassium compound fertilizer is still rare in the prior art

Images