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Slow-release fertilizer for improving heavy metal contamination of soil

A heavy metal trapping agent and fertilizer technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of poor adhesion of clay minerals, secondary pollution of heavy metals, etc., to improve water storage and moisture retention performance, increase binding capacity , The effect of fertilizer structure stability

Inactive Publication Date: 2019-05-31
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology can effectively solve the problems of secondary pollution of heavy metals in organic fertilizer raw materials and poor adhesion of clay minerals. The obtained coated organic fertilizer can compete for the absorption of heavy metals by crops, prevent heavy metals from entering the food chain, and at the same time, promote the decomposition of organic matter Transformation can directly or indirectly provide crops with a variety of nutrients and stimulating substances, promote and regulate crop growth, improve soil nutrient structure and improve soil compaction

Method used

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  • Slow-release fertilizer for improving heavy metal contamination of soil

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 1. Purification of attapulgite

[0040] Take 5kg of attapulgite raw ore, crush it into 10cm particles by a jaw crusher, add 10 times the mass of water, add 1000ml of 10wt% hydrochloric acid, stir for 30 minutes, centrifuge and filter to obtain purified attapulgite.

[0041] 2. Surface activation of attapulgite

[0042] An appropriate amount of aqueous solution of 150 g of dispersant sodium hexametaphosphate was added to the purified attapulgite, stirred for 30 minutes, and then centrifuged at 200 rpm for 3 minutes to separate the upper layer of attapulgite nanocrystals and the lower layer of attapulgite and associated mineral aggregates.

[0043] 3. Freeze activation of attapulgite

[0044] Frozen the upper layer of attapulgite nanocrystals obtained in the previous step to -10°C for activation, and its specific surface area increased from 42.7m2 / g of the original ore to 94.6m2 / g, the pore volume increased from 0.088ml / g to 0.284ml / g, and the adsorption capacity It is greatly enh...

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Abstract

The invention discloses a slow-release fertilizer for improving heavy metal contamination of soil. The slow-release fertilizer comprises a pill core and a coated layer wrapping the surface of the pillcore, the pill core comprises basic fertilizer components, natural clay minerals, adhesives and heavy-metal capturing agents, and the coated layer comprises adhesives and natural clay minerals. The slow-release fertilizer can effectively solve the problem of weak adhesiveness of the clay minerals. The coated fertilizer can contest for heavy metal absorption by crops and prevent heavy metals fromentering a food chain, decomposing and transforming of organic matters are facilitated, various nutrition and stimulating substances can be directly or indirectly provided for the crops, growth of thecrops is facilitated and adjusted, and soil nutrient structures and soil hardening conditions are improved.

Description

Technical field [0001] The field of the present invention is the field of fertilizers, and specifically relates to an organic fertilizer composed of a pellet core containing basic fertilizer and a mineral coating layer covering the surface of the pellet core. Background technique [0002] Fertilizers are indispensable in agricultural production, and the use of chemical fertilizers has become more common, and the amount of fertilizer used is increasing year by year. However, due to improper use, the utilization rate of chemical fertilizers is reduced, which brings huge economic losses to agriculture and also brings some environmental problems. For example, trace metal elements mainly from pesticides, waste water, sludge and atmospheric sedimentation, whose content in the soil exceeds the background value, causes the heavy metals in the soil to be significantly higher than the original content, and causes the deterioration of the ecological environment quality, which causes the phy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/08C05G3/80C05G3/90
Inventor 刘伟生王文杰王刚王莹窦伟唐晓亮张国林刘伟
Owner LANZHOU UNIVERSITY
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