Preparation method and activating reactor for granular potassium-containing humic acid urea

Abstract

The invention relates to a preparation method and an activating reactor for granular potassium-containing humic acid urea. The preparation method comprises the steps that granular urea, weathered coal or lignite, and a catalyst perform an activating reaction in the activating reactor; then potassium chloride or potassium sulfate is added simultaneously; and cooling, grinding and granulation are performed, so that a granular potassium-containing humic acid urea fertilizer is prepared. A heat transfer jacket is arranged between an inner tank and an outer tank of the activating reactor; three agitating shafts are arranged in the tank body; an interlayer is arranged on the side wall of each agitating shaft; each helical blade adopts a hollow structure inside; and the heat transfer jacket, the heat transfer interlayers and the hollow structures of the helical blades are all filled with heat transfer fluid. According to the preparation method and the activating reactor, the heating temperature is uniform and stable, the activating reaction time is short, continuous reaction can be achieved, the reaction is sufficient and the activation is thorough, the reaction time for the whole production process is saved, urea is not needed to grind or melt, and energy consumption is reduced greatly.

Description

technical field [0001] The invention relates to a method for continuously producing granular potassium-containing humic acid urea by reacting weathered coal or lignite with urea, and belongs to the technical field of agricultural fertilizer production. Background technique [0002] my country is a big country in the use of fertilizers, and urea is one of the most important nitrogen fertilizers. The annual output of urea is about 55 million tons, and the domestic use is about 43 million tons. However, the utilization rate of urea in farmland is low, only 30%-35%. Part of nitrogen volatilizes in the form of ammonia and nitrous oxide or leaches into groundwater in the form of nitrate, causing environmental pollution and waste of resources. [0003] In order to improve the utilization efficiency of nitrogen in urea, scholars have conducted a lot of research and developed a variety of technical means and methods to improve the utilization efficiency of nitrogen in urea. Under ce...

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Problems solved by technology

This method uses molten urea, and its limitation is that the production must be connected with the urea production process. If this method is used in areas far away from urea production plants, the energy consumption will be too high and it is not suitable for large-scale production.

Chinese patents CN102153424A, CN1169975A, CN102260111A, and CN102249814A disclose the reaction conditions of the complexation of urea and humic acid and the process of producing fertilizers. The method adopted in these patents is to perform solid-liquid separation after the two fully react and then add or not add other raw materials Made into fertilizer, it is not suitable for large-scale production and application due to the high energy consumption of the solid-liquid separation process

Chinese patents CN1887819A and CN1580005A disclose the method of making fertilizer with urea and humic acid. The method of these two patents is to directly mix the two, and then add other raw materials to granulate. There is no reaction between the two, which is a simple mixed fertilizer process. Among them, the effect of humic acid is difficult to exert, and it cannot effectively improve the utilization efficiency of nitrogen in urea

The equipment uses steam heating, which is difficult to achieve stable temperature control, which affects the best reaction effect of humic acid urea. Two screw propellers are used, and the production efficiency is not high.

After searching, there is no public report on the relevant literature of potassium humic acid urea

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