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Method using sea water or brine to produce ammonium magnesium phosphate

A technology of magnesium ammonium phosphate and salt brine, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., to achieve the effect of high recovery rate and good economic benefits

Active Publication Date: 2018-09-25
山东和生海洋科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method using sea water or brine to produce ammonium magnesium phosphate
  • Method using sea water or brine to produce ammonium magnesium phosphate
  • Method using sea water or brine to produce ammonium magnesium phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Use sea water to produce ammonium magnesium phosphate by alkali method

[0051] A. Inducer: monoammonium phosphate + disodium hydrogen phosphate

[0052] B. Preparation of alkaline diluent

[0053] First dissolve 3g of anionic polyacrylamide in 800ml of deionized water, stir for more than 2 hours to fully dissolve; then add 135.0g of solid sodium hydroxide and 10.0g of powdered activated carbon, and dilute to a 1000ml volumetric flask with deionized water .

[0054] C. The reaction produces ammonium magnesium phosphate

[0055] Add 6 grams of monoammonium phosphate and 4 grams of disodium hydrogen phosphate to 1 kilogram of sea water, stir for 30 minutes, and fully dissolve. Then add 29ml of diluent, continue to stir, react for more than 30 minutes, the pH value of the solution stabilizes at 8.1. Let stand and settle for 2 hours.

[0056] Skim the supernatant, precipitate and filter, and dry at 50°C to obtain 9.45 g of white powder.

[0057] Through X-ray diffractometer analysis...

Embodiment 2-9

[0063] The basic situation is the same as in Example 1, except that the amount of seawater, the amount and combination of inducers, and the amount of diluents are adjusted to prepare magnesium ammonium phosphate. See Table 2 for details.

Embodiment 2 to 9

[0065]

[0066]

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Abstract

The invention relates to a method using sea water or brine to produce ammonium magnesium phosphate. The method includes the steps of firstly, adding an inducer into the sea water or brine, and evenlymixing; secondly, adding a diluent into the seawater or brine, and regulate pH to allow the pH to stably be 7-9; thirdly, performing standing settling for 1-12 hours, wherein the reaction system is divided into supernate and solid sediments after the standing settling; fourthly, performing solid-liquid separation to obtain the solid sediments, namely ammonium magnesium phosphate. Compared with theprior art, the method has the advantages that ammonium magnesium phosphate low in solubility product is produced to recycle magnesium ions, and high magnesium recycling rate is achieved; due to the fact that the ammonium magnesium phosphate is more expensive than magnesium hydroxide, the method is good in economic benefits; when the magnesium ions in the sea water or brine is recycled, other divalent (or above) ions are partially and completely precipitated, the material basis for forming water scale is basically eliminated in the supernate obtained after the sediments are separated, and convenience is brought to subsequent treatment.

Description

Technical field [0001] The invention belongs to the field of inorganic chemical industry, in particular to a process for directly using seawater or brine to prepare magnesium ammonium phosphate products. Background technique [0002] Magnesium ammonium phosphate, also called ammonium magnesium phosphate, magnesium ammonium phosphate, etc., molecular formula: NH 4 MgPO 4 ·6H 2 O, molecular weight: 245.4. It has low solubility and contains phosphorus, nitrogen, magnesium and other elements required by plants. It is usually used as a high-efficiency, high-quality slow-release fertilizer. A large amount of magnesium ammonium phosphate will not cause root burning. The plant will release as much as needed. The fertilizer utilization rate is high, which can reduce the number of fertilization and save labor costs. It is very popular in Europe, America and other countries. Even if it rains heavily, magnesium ammonium phosphate will not lose with water like traditional soluble nitrogen fe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45C05B17/00
CPCC01B25/451C05B17/00
Inventor 司志华郭强郭兴
Owner 山东和生海洋科技有限公司
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