Coated fertilizer for improving heavy metal contaminated soil and preparation method thereof

Abstract

The embodiment of the invention discloses a coated fertilizer for improving heavy metal contaminated soil and a preparation method thereof, and particularly relates to the field of fertilizers. The raw materials (in parts by weight) comprise 50-60 parts of base fertilizer, 8-12 parts of ground phosphate rock, 12-16 parts of seaweed powder, 6-10 parts of alginic acid, 6-10 parts of metal binding protein, 18-22 parts of coco coir, 6-10 parts of chitosan resin, 8-12 parts of activated carbon particles, 6-10 parts of linseed oil, and the balance of water. The preparation method comprises the following steps: mixing soaked and softened coco coir with a base fertilizer to form a new base fertilizer, then preparing coating slurry from ground phosphate rock, seaweed powder, alginic acid, metal binding protein, chitosan resin, activated carbon particles, residual coco coir and water, and finally coating, cooling and granulating the base fertilizer for multiple times by adopting the coating slurry. The coated fertilizer is slow in release and long in acting time, the fertility degree of soil can be effectively improved, and heavy metal in the soil can be well adsorbed and passivated.

Description

technical field [0001] The embodiments of the present invention relate to the field of fertilizers, in particular to coated fertilizers for improving heavy metal-contaminated soils. Background technique [0002] Chemical fertilizers play an important role in agricultural production, and 50% of the increase in food production in developing countries comes from the role of chemical fertilizers. However, the seasonal utilization rate of chemical fertilizers is low (at present, the seasonal utilization rate of nitrogen fertilizer in my country is only 20% to 35%, the utilization rate of phosphorus fertilizer is 10% to 20%, and the utilization rate of potassium fertilizer is 30% to 60%), which is far lower than The utilization level of developed countries in the world. The survey shows that the rate of points exceeding the standard of cultivated land in our country is 19.4%, and some seriously polluted soils cannot be cultivated. [0003] In terms of pollutants exceeding standar...

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Problems solved by technology

[0007] In the prior art, chemical methods are mostly used to deal with heavy metal pollution. Generally, chemical methods are combined with fertilizers for soil treatment, but the fertilizers produced can only take care of one of the two functions of heavy metal treatment and soil fertility.

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