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Method for synthesizing multi-element sustained-release compound fertilizer by using magnesium in seawater or bittern water

A technology of slow-release compound fertilizer and salt brine, which is applied in the field of comprehensive resource utilization, can solve the problems of undiscovered multi-component slow-release compound fertilizer, and achieve good economic benefits, high recovery rate, and low cost of source materials

Inactive Publication Date: 2019-05-10
山东和生海洋科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] There is no report on the synthesis of multivariate slow-release compound fertilizers using magnesium in seawater or brine

Method used

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  • Method for synthesizing multi-element sustained-release compound fertilizer by using magnesium in seawater or bittern water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Using magnesium in salt brine to synthesize multivariate slow-release compound fertilizer.

[0047] The brine was obtained from Haitian Company, Xiaying Economic Development Zone, Changyi City, Weifang City, Shandong Province, and its component contents are shown in Table 1.

[0048] Content of relevant components in table 1 salt brine

[0049] element

K

Na

Ca

Mg

P

N

Content, mg / L

275

43565

1491

7140

0.7

0.3

[0050] The inducer is: Potassium dihydrogen phosphate.

[0051] A. Preparation of diluent

[0052] First dissolve 3g of anionic polyacrylamide in 800ml of deionized water, stir for more than 2 hours, and fully dissolve; then add 117.0g of solid sodium hydroxide and 10.0g of powdered activated carbon, and use deionized water to make up the volume to a 1000ml volumetric flask.

[0053] B. Reaction synthesis of multivariate slow-release compound fertilizer

[0054] According to PO 4 3- :K + : Mg 2+ =...

Embodiment 2

[0063] The inducer is: potassium dihydrogen phosphate + potassium chloride.

[0064] The basic situation is the same as in Example 1, except that after adding potassium dihydrogen phosphate, 11g potassium chloride is added again, and the number of ions is adjusted to be PO 4 3- :K + : Mg 2+ =1:2:1.

[0065] Obtain multivariate slow-release compound fertilizer 32.7g, wherein Na3.1%, K9.3%, Mg10.2%, Ca2.2%, P 2 o 5 28.1%. Potassium content increased significantly.

[0066] The element K concentration in the supernatant was 9194mg / L, the Ca concentration was 521mg / L, Mg was not detected, and the P concentration was 433mg / L (based on PO 4 3- count).

Embodiment 3

[0068] The inducer is: potassium dihydrogen phosphate + potassium chloride.

[0069] The basic situation is the same as in Example 1, except that after adding potassium dihydrogen phosphate, 22g potassium chloride is added again, and the number of ions is adjusted to be PO 4 3- :K + : Mg 2+ =1:3:1.

[0070] Obtain 33.0 g of multivariate slow-release compound fertilizers, wherein the K content is 10.7%, and the contents of other components are similar to those in Example 2. Potassium levels are up a bit again.

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Abstract

The invention relates to a method for synthesizing multi-element sustained-release compound fertilizer by using magnesium in seawater or bittern water. The multi-element sustained-release compound fertilizer is synthesized by adopting magnesium in seawater or bittern water as a raw material and adding elements such as phosphorus, potassium and the like. The method comprises the steps: inducting reaction, diluting and adjusting the pH, standing precipitating, carrying out the solid-liquid separation, cleaning with clean water and drying. The magnesium ion is recovered by generating the multi-element sustained-release compound fertilizer with lower solubility product, and the recovery rate of the magnesium is higher; and since the magnesium raw material is from the seawater or bittern water,the raw material cost is low, and the economic benefit is good; when the magnesium ion in the seawater or bittern water is recovered, other divalent (including ions higher than divalent) ions can bepartially or completely precipitated, a substance base for forming water scales can be basically eliminated in supernatant formed after the precipitates are separated, so that convenience can be provided for the subsequent treatment; and the separated multi-element sustained-release compound fertilizer contains elements such as phosphorus, potassium, magnesium, calcium and the like, so that the problem that the potassium ion sustained-release effect is poor can be solved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of resources, in particular to a method for synthesizing multivariate slow-release compound fertilizer by using magnesium in seawater or salt brine. Background technique [0002] Seawater is a huge treasure house of resources, and there are many kinds of metal ions with a price of one and two or more in seawater. For magnesium ions (Mg 2+ ), in seawater with a total salinity of 3.2%, the concentration of magnesium ions is usually 1100mg / L to 1300mg / L, so magnesium resources in seawater are quite abundant. Magnesium is one of the main components of chlorophyll in plants, which can promote photosynthesis of plants, promote plant growth, and increase crop yield. At the same time, there are a lot of calcium ions in seawater, which is also an essential element for plants. [0003] Brine is brine with high salinity stored underground. There are abundant brine resources in the Bohai Bay area o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
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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