Continuous production device of powdered and granulated 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 production capacity and strong chelating ability

Active Publication Date: 2017-11-03
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Continuous production device of powdered and granulated polyphosphate fertilizer
  • Continuous production device of powdered and granulated polyphosphate fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0042] like 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.

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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 powdered and granulated polyphosphate fertilizer. The device comprises a urea conveying unit, a phosphoric acid conveying unit, a phosphate conveying unit, a pre-polymerizer, a belt type polymerizer, a tail gas treating unit and an aftertreatment unit; urea, phosphoric acid and phosphate which are conveyed by the urea conveying unit, the phosphoric acid conveying unit and the phosphate conveying unit respectively are mixed in the pre-polymerizer to perform prepolymerization reaction to obtain viscous materials with flowability, the materials sequentially completes heating polymerization and cooling solidification in the belt type polymerizer, and the materials are crushed in the aftertreatment unit to obtain the powdered and granulated polyphosphate fertilizer. Compared with the prior art, the device can realize continuous production of the powdered and granulated polyphosphate fertilizer, solves the problems that the polyphosphate is difficult to discharge continuously and difficult to crush in the conventional production process, has high producitivity and high production efficiency, has product performance which is easy to control, and can meet the development requirement of the modern agriculture on the novel fertilizer.

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 Applications(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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