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...

Examples

Embodiment 1

[0052] An activation reactor with a structure such as figure 1 , figure 2 , image 3 Shown, comprise airtight horizontal tank body and motor, airtight horizontal tank body is arranged on the base bracket 10, horizontal tank body comprises inner tank body and outer tank body 2, and the space between inner tank body and outer tank body The cavity is a heat transfer jacket, and the heat transfer jacket is filled with heat-conducting oil. On the side wall of the outer tank body 2, an oil inlet 3 and an oil outlet 4 are connected to the heat transfer jacket. On the side wall of the outer tank body 2 It is also provided with a feed port 6 and a discharge port 7 respectively connected to the inside of the inner tank body, and three stirring shafts 1 are arranged in the inner tank body. The stirring shaft 1 is driven by a motor, and the side wall of each stirring shaft 1 is There are two inner and outer layers, and the cavity between the inner and outer side walls is a heat transfe...

Embodiment 2

[0056] A kind of activation reactor, structure is shown in embodiment 1, difference is:

[0057] The feed port 6 is set on the upper part of the outer tank body 2, the discharge port 7 is set on the lower part of the outer tank body 2, the horizontal distance between the feed port 6 and the discharge port 7 is 4200 mm, and the oil inlet 3 is located at the lower part of the outer tank body 2 , the oil outlet 4 is located on the upper part of the outer tank body 2, and the horizontal distance between the oil inlet 3 and the oil outlet 4 is 4300mm.

[0058] The three stirring shafts 1 are arranged in an equilateral triangle in the inner tank, and the distance between two adjacent stirring shafts is 250 mm. The diameter of the outer ring of the spiral blade is 260mm. The minimum distance between the outer edge of the spiral blade on each stirring shaft and the inner tank is 120mm.

[0059] The airtight horizontal tank is 4500mm long, the inner diameter of the inner tank is 920m...

Embodiment 3

[0061] A preparation method of granular potassium humic acid urea, comprising using the activation reactor described in embodiment 1, the steps are as follows:

[0062] (1) Preparation of liquid catalyst

[0063] The raw materials are composed as follows in parts by weight: 20 parts of potassium hydroxide and 80 parts of water. Dissolve potassium hydroxide in water to prepare a potassium hydroxide solution.

[0064] (2) Preparation of mixed materials

[0065] Pulverize the lignite through a pulverizer, pass through a 150-mesh sieve, transport the sieved lignite, granular urea, and ammonium bicarbonate powder to a material mixer for full stirring and mixing, then spray potassium hydroxide solution, and immediately stir and mix evenly to obtain The mixed material is composed as follows in parts by weight: 30 parts of lignite, 50 parts of urea, 6 parts of ammonium bicarbonate powder, 4 parts of potassium hydroxide solution, and 10 parts of potassium chloride powder.

[0066] (...

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...

Examples

Embodiment 1

[0052] An activation reactor with a structure such as figure 1 , figure 2 , image 3 Shown, comprise airtight horizontal tank body and motor, airtight horizontal tank body is arranged on the base bracket 10, horizontal tank body comprises inner tank body and outer tank body 2, and the space between inner tank body and outer tank body The cavity is a heat transfer jacket, and the heat transfer jacket is filled with heat-conducting oil. On the side wall of the outer tank body 2, an oil inlet 3 and an oil outlet 4 are connected to the heat transfer jacket. On the side wall of the outer tank body 2 It is also provided with a feed port 6 and a discharge port 7 respectively connected to the inside of the inner tank body, and three stirring shafts 1 are arranged in the inner tank body. The stirring shaft 1 is driven by a motor, and the side wall of each stirring shaft 1 is There are two inner and outer layers, and the cavity between the inner and outer side walls is a heat transfe...

Embodiment 2

[0056] A kind of activation reactor, structure is shown in embodiment 1, difference is:

[0057] The feed port 6 is set on the upper part of the outer tank body 2, the discharge port 7 is set on the lower part of the outer tank body 2, the horizontal distance between the feed port 6 and the discharge port 7 is 4200 mm, and the oil inlet 3 is located at the lower part of the outer tank body 2 , the oil outlet 4 is located on the upper part of the outer tank body 2, and the horizontal distance between the oil inlet 3 and the oil outlet 4 is 4300mm.

[0058] The three stirring shafts 1 are arranged in an equilateral triangle in the inner tank, and the distance between two adjacent stirring shafts is 250 mm. The diameter of the outer ring of the spiral blade is 260mm. The minimum distance between the outer edge of the spiral blade on each stirring shaft and the inner tank is 120mm.

[0059] The airtight horizontal tank is 4500mm long, the inner diameter of the inner tank is 920m...

Embodiment 3

[0061] A preparation method of granular potassium humic acid urea, comprising using the activation reactor described in embodiment 1, the steps are as follows:

[0062] (1) Preparation of liquid catalyst

[0063] The raw materials are composed as follows in parts by weight: 20 parts of potassium hydroxide and 80 parts of water. Dissolve potassium hydroxide in water to prepare a potassium hydroxide solution.

[0064] (2) Preparation of mixed materials

[0065] Pulverize the lignite through a pulverizer, pass through a 150-mesh sieve, transport the sieved lignite, granular urea, and ammonium bicarbonate powder to a material mixer for full stirring and mixing, then spray potassium hydroxide solution, and immediately stir and mix evenly to obtain The mixed material is composed as follows in parts by weight: 30 parts of lignite, 50 parts of urea, 6 parts of ammonium bicarbonate powder, 4 parts of potassium hydroxide solution, and 10 parts of potassium chloride powder.

[0066] (...

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