Method for preparing sustained-release fertilizer

A chemical fertilizer and slow-release technology, applied in fertilizer forms, fertilization devices, fertilizer mixtures, etc., can solve the problems of loss and inability to make full use of chemical fertilizers, and achieve the effects of reducing waste, prolonging the available time, and reducing pollution.

Active Publication Date: 2011-01-19
河北硅谷肥业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the expanded perlite is mixed evenly with chemical fertilizers, and there is very little chemical fertilizer embedded in the pores of the expanded perlite (including the inner space of the hollow ball), and the fertilizer is only embedded on the surface of the pores, which cannot make full use of the large amount of expanded perlite. The role of pores to prevent fertilizer loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, the method for preparing Potassium chloride slow-release chemical fertilizer under normal temperature

[0025] Making porous microbeads: Pour perlite powder at a constant speed on the top of the puffing furnace. The temperature in the puffing furnace is 1000 ℃ ~ 1300 ℃. What falls out from the bottom of the puffing furnace is expanded perlite granules, which become puffed stone powder after cooling. Porous microbeads, or vitrified microbeads, or expanded perlite, or expanded perlite. The diameter of expanded perlite is 0.3-1.5 mm, and the bulk density is 120-130 kg / m3.

[0026] Powdered chemical fertilizer: chemical fertilizer is potassium chloride powder, and the particle size of potassium chloride powder is less than 0.5mm.

[0027] Fitting at room temperature: After evacuating the vacuum container to a pressure of minus 1.5Mpa, inject puffed perlite into the vacuum pot, stir the puffed perlite to vacuumize, and stabilize the vacuum at a pressure of min...

Embodiment 2

[0028] Embodiment 2, the method for preparing Potassium chloride slow-release chemical fertilizer by high temperature method

[0029]Making porous microbeads: Pour obsidian powder into the top of the puffing furnace at a constant speed. The temperature in the puffing furnace is 1100 ℃ ~ 1300 ℃. What falls out from the bottom of the puffing furnace is expanded obsidian granules, which become stone powder after cooling Expanded porous microbeads, or vitrified beads, or expanded obsidian, or expanded obsidian. The diameter of puffed obsidian rock grains is 0.3-1.5 mm, and the bulk density is 100-110 kg / m3.

[0030] Powdered chemical fertilizer: same as embodiment 1.

[0031] Heating chimera: Vacuumized in an environment of 120°C to 150°C, after the vacuum container is evacuated to a pressure of minus 1.2Mpa, vitrified beads are injected into the vacuum container, and the vitrified beads are stirred. Stabilize the vacuum at a pressure of minus 1.0Mpa and stop vacuuming for 10 mi...

Embodiment 3

[0032] Embodiment 3, the method for preparing potassium chloride slow-release chemical fertilizer by high temperature method

[0033] After obtaining the primary product of potassium chloride slow-release fertilizer in Example 2, aluminum pyrophosphate colloid with a weight ratio of 5‰ was added to the vacuum vessel, granulated and dried under stirring to become a finished slow-release fertilizer.

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PUM

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Abstract

The invention relates to a method for preparing a sustained-release fertilizer, and belongs to a method for preparing the sustained-release fertilizer by embedding a fertilizer into the pores of a carrier, in particular a method for preparing the sustained-release fertilizer by embedding the fertilizer into the pores of porous microspheres puffed by mountain flour in a larger amount than that in the prior art. The method comprises the following steps of: putting the porous microspheres puffed by the mountain flour in a vacuum container which is vacuumized; stopping vacuumizing after the air in the pores of the porous microspheres puffed by the mountain flour is pumped out completely; pouring the fertilizer into the vacuum container; uniformly mixing the porous microspheres puffed by the mountain flour and the fertilizer; gradually reducing the vacuum to normal pressure to ensure that the fertilizer is absorbed into the pores of the porous microspheres puffed by the mountain flour as much as possible; and thus, obtaining a sustained-release fertilizer primary product. Compared with the method of simply mixing the porous microspheres puffed by the mountain flour and the fertilizer, the method not only increases the vacuumization process and the cost, but prolongs the utilizable time of the fertilizer in the soil, increases the utilization rate of the fertilizer and reduces the fertilizer pollution.

Description

technical field [0001] The invention belongs to a method for preparing slow-release chemical fertilizers by embedding chemical fertilizers in the pores of carriers, in particular a method for preparing slow-release chemical fertilizers in which the amount of embedded chemical fertilizers in the pores of stone powder puffed porous microbeads is greater than that of existing embedded chemical fertilizers. Background technique [0002] Most chemical fertilizers, namely chemical fertilizers, are easily soluble in water. They are easily dissolved by rainwater in the soil and run off with the water flow, resulting in two adverse consequences of water pollution in reservoirs and rivers and loss of fertilizer in the soil. [0003] Chinese patents 91102939.7 and 01143467.8 respectively disclose the technology of using expanded perlite as a carrier and embedding chemical fertilizers in the pores of expanded perlite to form slow-release fertilizers. However, the expanded perlite is mix...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G5/00
Inventor 廖大中
Owner 河北硅谷肥业有限公司
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