A continuous production device for powdery polyphosphate fertilizer

A technology of polyphosphate and production equipment, which is applied in the direction of magnesium bisphosphate fertilizer, alkaline orthophosphate fertilizer, magnesium phosphate fertilizer, etc. It can solve the problems that are not conducive to continuous product extraction and cannot achieve continuous large-scale production. , to achieve the effect of overcoming the difficulty of continuous discharge, large capacity and high production efficiency

Active Publication Date: 2021-02-23
SHANGHAI RES INST OF CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is polymerized and solidified in a polymerizer with a conventional stirrer. The solidified polyphosphate semi-product is very easy to adhere to the wall of the reactor and the stirrer, which is not conducive to continuously taking out the product from the polymerizer. The entire production process is practical. For intermittent production, it is impossible to achieve continuous mass production

Method used

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  • A continuous production device for powdery polyphosphate fertilizer
  • A continuous production device for powdery polyphosphate fertilizer

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Experimental program
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Embodiment

[0042] Such as figure 1 A continuous production device for powdery polyphosphate fertilizer shown, the device includes a urea delivery unit, a phosphoric acid delivery unit, a phosphate delivery unit, and a pre-loading unit connected to the urea delivery unit, the phosphoric acid delivery unit and the phosphate delivery unit respectively. The polymerizer 6, the belt polymerizer 12 connected to the prepolymerizer 6, the tail gas treatment unit and the post-treatment unit connected to the prepolymerizer 6 and the belt polymerizer 12 respectively, are composed of a urea delivery unit and a phosphoric acid delivery unit respectively. , urea, phosphoric acid, and phosphate transported by the phosphate delivery unit are mixed in the prepolymerizer 6 and prepolymerized to obtain a fluid viscous material, which is sequentially heated, polymerized, and cooled in the belt polymerizer 12 solidified, and then crushed in the post-processing unit to obtain powdery polyphosphate fertilizer. ...

Embodiment 2

[0054] Utilize the concrete steps of device continuous production powdery potassium polyphosphate fertilizer in embodiment 1 to be:

[0055] 1) Pre-polymerization: Add phosphoric acid, potassium dihydrogen phosphate and urea to the pre-polymerizer 6 respectively, and react at 60°C for 10 minutes to obtain a viscous material with proper fluidity;

[0056] 2) thermal polymerization and cooling: adding the viscous material to the belt polymerizer 12 equipped with a heating zone and a cooling zone at a uniform speed, and then heating, polymerizing, cooling and solidifying in sequence to obtain a solid material;

[0057] 3) Crushing: After the solid material is broken, powdery potassium polyphosphate fertilizer can be obtained.

Embodiment 3

[0059] Utilize the concrete steps of device continuous production powder calcium polyphosphate fertilizer in embodiment 1 to be:

[0060] 1) Pre-polymerization: Add phosphoric acid, calcium dihydrogen phosphate and urea to the pre-polymerizer 6 respectively, and react at 140°C for 2 minutes to obtain a viscous material with proper fluidity;

[0061] 2) thermal polymerization and cooling: adding the viscous material to the belt polymerizer 12 equipped with a heating zone and a cooling zone at a uniform speed, and then heating, polymerizing, cooling and solidifying in sequence to obtain a solid material;

[0062] 3) Crushing: After the solid material is broken, powdery calcium polyphosphate fertilizer can be obtained.

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Abstract

The invention relates to a continuous production device of powdery polyphosphate fertilizer, which comprises a urea delivery unit, a phosphoric acid delivery unit, a phosphate delivery unit, a pre-polymerizer, a belt polymerizer, a tail gas treatment unit and a post-treatment unit, respectively The urea, phosphoric acid, and phosphate delivered by the urea delivery unit, phosphoric acid delivery unit, and phosphate delivery unit are mixed in the prepolymerizer and prepolymerized to obtain a fluid viscous material. The material is in the belt polymerizer Complete heating polymerization, cooling and solidification in sequence, and then crush in the post-processing unit to obtain powdery polyphosphate fertilizer. Compared with the prior art, the present invention can realize the continuous production of powdery polyphosphate fertilizer, overcomes the difficulties of continuous polyphosphate discharge and unbreakable polyphosphate in the conventional production process, has large production capacity, high production efficiency, and easy product performance. Control can meet the development needs of modern agriculture for new fertilizers.

Description

technical field [0001] The invention belongs to the technical field of water-soluble fertilizer preparation, and relates to a continuous production device of powdery polyphosphate fertilizer. Background technique [0002] Polyphosphate is also known as polyphosphate or condensed phosphate, and can be divided into two types: low polymerization and high polymerization according to its degree of polymerization. Among them, when the degree of polymerization n is 2-20, it has water solubility; when the degree of polymerization n>20, the water solubility is poor. The degree of polymerization has a significant impact on the solubility of polyphosphates. The polyphosphates suitable for use as fertilizers are mainly water-soluble oligomeric short-chain polyphosphates with a degree of polymerization below 20. [0003] At present, oligophosphate has been successfully applied in the field of liquid fertilizer and compound fertilizer. As a fertilizer, compared with conventional phos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05B7/00C05B9/00
CPCC05B7/00C05B9/00
Inventor 吴文华李接励袁宸梁济葛建国陈明良孔猛胡爽
Owner SHANGHAI RES INST OF CHEM IND
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