Spherical granulation method of potash magnesium sulphate fertilizer

Abstract

The invention discloses a spherical granulation method of a potash magnesium sulphate fertilizer. The method is implemented according to the following steps: taking a refined soft potash magnesium sulphate fertilizer containing 16.32% of free water, uniformly mixing the refined soft potash magnesium sulphate fertilizer with a return material crushed to a particle size of less than 2 mm and a mixture containing 3.66% of free water according to a mass part ratio of 7: 3 to obtain a mixture containing 15.1% of free water, sequentially feeding the mixture into a spiral shaping machine for pre-shaping and a drum granulatorfor granulating , screening and drying to obtain spherical potassium-magnesium fertilizer particles, wherein the tail part of the drum granulator is connected with a hot air pipe for controlling the discharging temperature of the granulator to be 80 DEG C. The method provided by the invention does not need to add an aggregate additive, and avoids the introduction of ineffective components. In the production process, spherical particles with different particle sizes and high uniformity can be obtained by changing the size of the spiral pre-shaping screen, and the requirements of customers can be better met. The spherical particles are high in uniformity, high in forming rate and strength and small in porosity.

Description

technical field [0001] The invention relates to a spherical granulation method for potassium magnesium sulfate fertilizer. Background technique [0002] In the potash fertilizer industry, there are roughly three commonly used granulation methods: extrusion method, pellet method, and spray method. 1. The spray method is mainly used for granulation of low-melting point fertilizers, which has the characteristics of high molding rate. The disadvantage is that the product is required to have low melting point characteristics, and it is not suitable for granulation of high-melting point potassium fertilizers such as potassium magnesium sulfate fertilizer. 2. The agglomeration method is currently the most commonly used method for compound fertilizer granulation. It is characterized by simple equipment structure, large single-machine output, and round particle appearance. The disadvantages are poor particle uniformity, large porosity, low particle strength, and low molding rate. Lo...

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Problems solved by technology

1. The spray method is mainly used for granulation of low-melting point fertilizers, which has the characteristics of high molding rate. The disadvantage is that the product is required to have low melting point characteristics, and it is not suitable for granulation of high-melting point potassium fertilizers such as potassium sulfate and magnesium fertilizers.

2. The agglomeration method is currently the most commonly used method for compound fertilizer granulation. It is characterized by simple equipment structure, large single-machine output, and round particle appearance. The disadvantages are poor particle uniformity, large porosity, low particle strength, and low molding rate. Low

3. The extrusion method has a simple process, large processing capacity, high particle strength, and low energy consumption. The disadvantages are relatively high requirements for rollers, irregular particles, rough particle surfaces, poor fluidity, low molding rate, and high equipment maintenance costs. , the production process is dusty, the equipment failure rate is high, the maintenance cost is high, the molding rate is low, the appearance of the product is irregular, and there is currently no relevant report on the production of potassium magnesium sulfate fertilizer particles by drum granulation in China

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