Production method of compound fertilizer containing poly-magnesium phosphate

A production method, magnesium phosphate technology, applied in the direction of phosphate fertilizer, ammonium nitrate fertilizer, nitrate fertilizer, etc., can solve the problems of high production cost, poor efficiency of compound fertilizer, high energy consumption, etc., and achieve high product quality and low production cost Effect

Inactive Publication Date: 2016-04-13
王丰登
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of production method of magnesium polyphosphate-containing compound fertilizer, thereby overcome t

Method used

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Examples

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Effect test

Embodiment 1

[0026] A production method of magnesium polyphosphate-containing compound fertilizer, comprising the following steps:

[0027] Step 1, adopt 100 parts of wet process phosphoric acid containing 25% phosphoric acid without concentration and filtration, add 5.5 parts of magnesium oxide powder containing 90% of magnesium oxide, respectively join in the reactor for reaction, and obtain dilute phosphoric acid containing water-insoluble matter. Magnesium dihydrogen solution, the solution is filtered to form pure dilute magnesium dihydrogen phosphate solution;

[0028] Step 2, the pure dilute magnesium dihydrogen phosphate solution enters the first evaporator and is heated for one time evaporation to form a concentrated magnesium dihydrogen phosphate solution containing 35% water;

[0029] Step 3: Concentrate the magnesium dihydrogen phosphate solution and then add 50 parts of calcium ammonium nitrate containing 27% nitrogen, enter the second evaporator and heat at 200 ° C, the vacuum...

Embodiment 2

[0032] A production method of magnesium polyphosphate-containing compound fertilizer, comprising the following steps:

[0033] Step 1: Using 80 parts of unconcentrated, filtered wet-process phosphoric acid containing 25% phosphoric acid, adding 4.5 parts of magnesium oxide powder containing 90% magnesium oxide, respectively adding them to the reactor for reaction, and obtaining a solution containing a small amount of water-insoluble matter. Dilute magnesium dihydrogen phosphate solution, the solution is filtered again to form pure dilute magnesium dihydrogen phosphate solution;

[0034] Step 2: Add 30 parts of urea containing 46% nitrogen to the purified dilute magnesium dihydrogen phosphate, enter the evaporator to heat at 110°C, vacuum degree 0.08Mpa, and evaporate, after evaporation, a slurry with water content of 0.8% is formed, and phosphoric acid in the slurry is formed. Dihydrogen radicals have been partially converted into polyphosphate radicals, which is equivalent to...

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Abstract

The invention discloses a production method of compound fertilizer containing poly-magnesium phosphate. The method includes the following steps that firstly, wet-process phosphoric acid and magnesium oxide powder are added into a reactor in proportion, and a dilute magnesium biphosphate solution is obtained; secondly, one or more of urea, ammonium nitrate, calcium ammonium nitrate and nitric phosphate are added into the dilute magnesium biphosphate solution and placed in an evaporator to be heated and evaporated, and a sizing agent is obtained; thirdly, the sizing agent is produced to form the compound fertilizer containing poly-magnesium phosphate. According to the production method of the compound fertilizer containing poly-magnesium phosphate, conventional wet-process phosphoric acid serves as main raw materials, the magnesium oxide powder is applied to perform reaction and processing, the compound fertilizer containing poly-magnesium phosphate is produced, and production cost is low. Not only is magnesium fertilizer added, but also 10% or above ortho-dihydrogen phosphate radicals are converted into poly-phosphate radicals, and product quality is high.

Description

technical field [0001] The invention relates to the production field of compound fertilizers, in particular to a production method of compound fertilizers containing magnesium polyphosphate. Background technique [0002] Magnesium is an essential medium element for plants and an important component of chlorophyll, which is essential for photosynthesis. Magnesium is an activator of many enzymes, which can promote the metabolism of carbohydrates, the synthesis of nucleic acids, the conversion of phosphates, etc., which is helpful for crop growth and high yield. The main problem encountered when adding magnesium fertilizer to compound fertilizer production materials is that the commonly used magnesium sulfate often contains crystal water, which cannot be dried during compound fertilizer production, resulting in easy powdering and hardening of particles. Therefore, most magnesium fertilizers are applied alone at this stage. Increase the difficulty of technology dissemination a...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05G3/00
CPCC05B13/06C05G3/00C05B17/00C05C1/00C05C5/04C05C9/00
Inventor 王丰登
Owner 王丰登
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