Coated potash fertilizer as well as preparation method and application thereof

A potash fertilizer and coating technology, applied in the application, potash fertilizer, layered/coated fertilizer, etc., can solve the problems of time-consuming, unbalanced, and intensified acidification in the mixing process, reduce the loss with rain, improve the Agronomic traits, the effect of improving the utilization rate of potassium ions

Active Publication Date: 2020-10-30
TOBACCO RES INST CHIN AGRI SCI ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the common method of improving acidic soil is to directly neutralize soil acidity by applying alkaline substances such as lime and dolomite powder, but this method has some disadvantages: 1) long-term and large-scale application of lime will cause soil compaction and nutrient imbalance; 2) improve The spreading of the agent and the mixing of the soil and the amendment are labor-intensive and time-consuming, and are prone to inhomogeneity, which may easily cause poor uniformity of soil pH adjustment, which in turn leads to the occurrence of seedling burning; 3) Lime application After the application of lime, there is a re-acidification process, that is, the soil is acidified again after the alkali consumption of lime, and the degree of acidification is more severe than that before lime application.

Method used

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  • Coated potash fertilizer as well as preparation method and application thereof
  • Coated potash fertilizer as well as preparation method and application thereof
  • Coated potash fertilizer as well as preparation method and application thereof

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preparation example Construction

[0027] The present invention also provides the preparation method of above-mentioned coated potash fertilizer, comprises the following steps:

[0028] (1) Use dry air to spray potassium hydroxide heated to molten state onto the turntable to obtain spherical potassium hydroxide particles; or use high-speed shearing method to shear potassium hydroxide heated to molten state onto the turntable to produce Spherical potassium hydroxide particles;

[0029] (2) adding calcium carbonate to the rotating disk containing the spherical potassium hydroxide particles described in step (1), to obtain the inner core wrapped with an alkaline material layer;

[0030] (3) spray polyvinyl alcohol aqueous solution to the surface of the spherical potassium hydroxide particle that step (1) obtains or the inner core surface that step (2) obtains and is wrapped with alkaline material layer, obtain coated potash fertilizer.

[0031] In the present invention, the pressure of the dry air injection is pr...

Embodiment 1

[0037] The potassium hydroxide raw material is heated to 380°C in a heating tank with a high-temperature-resistant cermet as the liner, so that the potassium hydroxide reaches a molten state. When sprayed with high-speed dry air, the potassium hydroxide droplets form spherical droplets due to surface tension, and the droplets solidify into round spheres when encountering cold wind. The round pellets solidified by the cold wind fall into the turntable that is equipped with 120 mesh lime powder, 20 revolutions per minute, and an angle of 55°. As the turntable rotates, the potassium hydroxide particles are wrapped with a layer of lime powder.

[0038] The mass ratio of polyvinyl alcohol to water is 3:10. First heat the water to 80°C, then slowly add polyvinyl alcohol and stir until dissolved; spray the polyvinyl alcohol aqueous solution through a high-speed atomizing pump, and evenly spray it on the lime Wrap the surface of the round granular potassium hydroxide that is rolling a...

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Abstract

The invention relates to the technical field of inorganic fertilizers, in particular to a coated potash fertilizer as well as a preparation method and application thereof. The invention provides the coated potash fertilizer with a multilayer structure. The coated potash fertilizer comprises an inner core and an outer layer, the outer layer is a polyvinyl alcohol layer, or comprises an alkaline material layer and a polyvinyl alcohol layer from inside to outside; the raw material for preparing the inner core is potassium hydroxide, the raw material for preparing the alkaline material layer is calcium carbonate, and the raw material for preparing the polyvinyl alcohol layer is a polyvinyl alcohol aqueous solution. The coated potash fertilizer provided by the invention can effectively balancethe pH value of acid soil, and effectively improve the agronomic traits and economic benefits of crops.

Description

technical field [0001] The invention relates to the technical field of inorganic fertilizers, in particular to a coated potash fertilizer and its preparation method and application. Background technique [0002] The acidity and alkalinity of the soil refers to the acidity or alkalinity shown by the mixing of various substances in the soil. The acidity and alkalinity of soil depends on the amount of hydrogen ions and hydroxide ions present in the soil. When the concentration of hydrogen ions is greater than that of hydroxide ions, the soil is acidic; otherwise, it is alkaline; when the two are equal, it is neutral. Soil acidity will affect the structure of the soil, inhibit the activities of soil microorganisms, and make it difficult for the active ingredients to be used by crops. In particular, phosphorus, which has a greater impact on plant growth and development, is particularly affected by soil acidity and alkalinity. When the pH value is lower than 6, phosphoric acid a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/40C05G3/80C05G5/12C05G5/35
CPCC05G3/00C05G3/40C05G3/80C05G5/35C05G5/12C05D1/00C05D3/02
Inventor 窦玉青张忠锋刘新民申国明
Owner TOBACCO RES INST CHIN AGRI SCI ACAD
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