Preparation method and application of magnesium slag-based controlled-release selenium fertilizer
A magnesium slag-based controlled-release, selenium fertilizer technology, applied in magnesium fertilizer, application, inorganic fertilizer and other directions, to achieve the effects of reducing the loss of selenium fertilizer, improving the utilization rate, and low cost of raw materials
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Embodiment 1
[0033] (1) Preparation of magnesium slag-based nanostructured composites
[0034] Magnesium slag, activator (Na2SiO3·9H2O) and water were mixed and stirred at a mass ratio of 1:0.1:0.28 and put into a mold with a size of 40mm×40mm×2000mm. After compaction on a shaker table, it was cured in a muffle furnace at 85°C for 2 hours and then at room temperature for 6 days. 240 g of the powdered material above was immersed in 800 mL of a 2.5 mol / L ammonium acetate solution for ion exchange for 6 hours. Using a scanning electron microscope to observe the appearance of the magnesium slag-based nanostructured composite material, it can be found that the surface of the material is rough and the particle structure is fine. And the N2 adsorption-desorption curve and pore size distribution results prove that the material is a microporous adsorption material with a relatively regular pore structure, which proves the successful preparation of magnesium slag-based nanostructured composites.
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Embodiment 2
[0038] Add 50 mg of magnesium slag-based controlled-release selenium fertilizer prepared above to 500 mL of phosphate and carbonate solutions of different concentrations (1mM, 3mM and 5mM), and shake in a constant temperature shaking box (25°C, 120rpm / min). For 12 hours, the supernatant was collected at different time intervals, the selenium content in the supernatant was determined, and the selenium release rate of the magnesium slag-based controlled-release selenium fertilizer was calculated.
[0039] According to the experimental results, it can be found that the magnesium slag-based controlled-release selenium fertilizer has a strong response to anions (phosphate and carbonate ions), and the phosphate ion has the best controlled-release effect on the magnesium-slag-based controlled-release selenium fertilizer. A release efficiency of 80.7% can be achieved. The magnesium slag-based controlled-release selenium fertilizer has a release efficiency of less than 10% of selenium ...
Embodiment 3
[0041] The magnesium slag-based controlled-release selenium fertilizer (0.05g) powder (100 mesh) and soil (50g) were mixed well, and then the resulting system was placed in a plastic tube (cylindrical, 50mL, 3.5cm in diameter). Then, 100 mL of distilled water or anion (phosphate and carbonate) aqueous solutions of different concentrations were sprayed into the tube from the top of the system at a rate of 10 mL / min respectively, the leachate was collected, and the concentration of selenium in the leachate was measured.
[0042] According to the experimental results, it can be seen that, similar to the experimental results in water, the magnesium slag-based controlled-release selenium fertilizer in the soil medium still has a strong response to anions (phosphate and carbonate ions), and the response intensity varies with the anion concentration. rising and gradually rising. When the anion is phosphate and the ion concentration is 5mM, the highest concentration of selenium in the...
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