A kind of slow-release fertilizer for soil improvement and its preparation method and application

A slow-release fertilizer and soil improvement technology, applied in the field of agricultural environmental science, can solve the problems of air pollution, no economic benefit, waste of resources, etc., and achieve the effects of no secondary pollution, satisfying plant biological activity, and increasing grain yield.

Active Publication Date: 2019-01-08
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The output of crop wastes in my country, including rice straw, chaff, straw, etc., is huge, and the main treatment method is incineration. The gas produced will cause serious air pollution, and it does not produce economic benefits. It is a serious waste of resources.

Method used

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  • A kind of slow-release fertilizer for soil improvement and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Phosphate rock powder was activated by adding hydrochloric acid for 0.5h, during which it was continuously heated and stirred at 100°C. The concentration of hydrochloric acid remains at 1mol / L, and the quality of phosphate rock powder is 30%;

[0035] (2) After activation, ferrous sulfate solution and crushed crop waste (corn stalks) were added and mixed together for 0.5 h, during which the mixture was continuously heated and stirred at 100° C. until viscous, and a viscous material was obtained. Ferrous sulfate concentration remains on 0.1mol / L, and the quality of crop waste is 50%;

[0036] (3) Carbonize the viscous material obtained in step (2) at 100° C. for 1 min, and pulverize it into powder after cooling.

[0037] (4) The powder obtained in step (3) is cross-linked with dextrin, extruded into fertilizer granules, and the final slow-release fertilizer for soil improvement is obtained.

Embodiment 2

[0039] (1) Phosphate rock powder was activated by adding sulfuric acid for 3 hours, during which it was continuously heated and stirred at 80°C. The concentration of sulfuric acid is kept at 0.5mol / L, and the quality of phosphate rock powder is 50%;

[0040] (2) After activation, ferric chloride solution and crushed crop waste (mixture of corn stalks and rice husks) were added and mixed together for 2 hours, during which the mixture was continuously heated and stirred at 80° C. until viscous, and a viscous substance was obtained. Ferric chloride concentration remains on 0.5mol / L, and the quality of crop waste is 25%;

[0041](3) Carbonize the viscous substance obtained in step (2) at 500°C for 10 minutes, and pulverize it into powder after cooling.

[0042] (4) Cross-linking the powder obtained in step (3) with carboxymethyl cellulose and extruding it into fertilizer granules to obtain the final slow-release fertilizer for soil improvement.

Embodiment 3

[0044] (1) Phosphate rock powder is activated by adding phosphoric acid for 5 hours, during which it is continuously heated and stirred at 50°C. The concentration of phosphoric acid is kept at 1mol / L, and the quality of phosphate rock powder is 80%;

[0045] (2) After activation, add ferrous chloride solution and crushed agricultural waste (corn stalks, bagasse, rice husk and rice husk mixture) and mix together for 3 hours, during which it is heated and stirred continuously at 50 ° C until it becomes viscous, and the obtained Goo. Ferrous chloride concentration remains on 1mol / L, and the quality of crop waste is 10%;

[0046] (3) Carbonize the viscous material obtained in step (2) at 800° C. for 20 minutes, and pulverize it into powder after cooling.

[0047] (4) The powder obtained in step (3) is cross-linked with cyclodextrin, extruded into fertilizer granules, and the final slow-release fertilizer for soil improvement is obtained.

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Abstract

The invention discloses slow-release fertilizer for soil improvement and a preparation method and application thereof. The method is easy to operate, cost is low, raw materials can be obtained easily, the effect is obvious, secondary pollution can be avoided, and the method is poisonless, harmless and more environmentally friendly. Ground phosphate rock is activated through high temperatures and acid liquor, the soluble phosphate content is increased, and the plant growth requirement is met. Meanwhile, crop waste is added and ferric salt is loaded, so that loose and porous charcoal is generated at the high temperature for improving soil; generated ferric oxide can adsorb and fix heavy metal at the same time, and soil improvement and slow release of fertilizer are integrated. The utilization rate of the ground phosphate rock is increased by activating the ground phosphate rock, the shortage current situation of phosphate rock resources is relieved, and secondary utilization of waste is realized by using the crop waste. The slow-release effect of slow-release fertilizer phosphorus for soil improvement is good, the requirement for the biological activity of plants is met, and phosphorus losses can be avoided. The slow-release fertilizer has the advantages of adsorbing and fixing the heavy metal of the soil, reducing soil hardening, increasing soil bulk density and the like; the grain yield is increased, and the grain safety is guaranteed.

Description

technical field [0001] The invention belongs to the field of agricultural environmental sciences, relates to a slow-release fertilizer for soil improvement and its preparation method and application, in particular to a method of using phosphate rock powder and agricultural waste to load iron salt and obtain it under the activation of acid solution A slow-release fertilizer for soil improvement and its preparation method and application. Background technique [0002] With the continuous development of economy and society, the problem of soil degradation has become increasingly prominent, mainly manifested in soil compaction, erosion, salinization, acidification, element imbalance, heavy metal pollution, loss of organic matter, and degradation of flora and fauna, etc. development of productivity. At present, the world has about 700 million hectares of arable land 2 , but an average of about 5 million hm per year 2 of the land is too degraded to produce food. my country's l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/04C05G3/80
CPCC05B11/04C05B11/08C05B11/10C05B11/12C05G3/80C05D9/02C05F5/002C05F11/00C05G3/00C05G5/12Y02P20/129
Inventor 蒋刚彪刘永林
Owner SOUTH CHINA AGRI UNIV
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