Preparation and application methods of environment-friendly passivator applied for heavy metals in farmland soil

A heavy metal passivator, an environmentally friendly technology, applied in the field of farmland soil environmental protection and restoration, can solve the problems of farmland soil heavy metal pollution, achieve the effects of preventing soil compaction, reducing toxicity and bioavailability, and improving soil texture

Inactive Publication Date: 2017-11-03
NANJING SREMOL ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to overcome the defects of the prior art, provide a preparation and ...

Method used

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  • Preparation and application methods of environment-friendly passivator applied for heavy metals in farmland soil
  • Preparation and application methods of environment-friendly passivator applied for heavy metals in farmland soil
  • Preparation and application methods of environment-friendly passivator applied for heavy metals in farmland soil

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preparation example Construction

[0022] A preparation method of an environment-friendly farmland soil heavy metal passivator, the preparation steps are as follows:

[0023] The first step: raw material treatment, first pass the modified sepiolite, modified attapulgite, modified bentonite and heavy metal precipitant through a 200-300 mesh sieve, and then pass the fermented organic waste, biochar mixture and tea stems 100-mesh sieve, calcium magnesium phosphate fertilizer passed through 80-mesh sieve;

[0024] The second step: mixing the materials, weighing each material according to the mass fraction, and sending them into the mixer to evenly stir up and down, left and right, inside and outside, so that the materials can be fully mixed;

[0025] The third step: turntable granulation, first transport the material accounting for 30-40% of the total weight of the mixture to the disc granulator for granulation. The inclination angle of the turntable of the granulator is controlled at 40°-50°. The speed should be ...

Embodiment 1

[0030] The first step: raw material treatment, first 25 parts by weight of modified sepiolite, 7 parts by weight of modified attapulgite, 1 part by weight of modified bentonite and 1 part by weight of heavy metal precipitant 200-300-mesh sieve, 22 parts by weight of fermented organic waste, 10 parts by weight of biochar mixture, 15 parts by weight of tea stems, passed through a 100-mesh sieve, and 19 parts by weight of calcium magnesium phosphate fertilizer passed through an 80-mesh screen;

[0031] The second step: mixing the materials, sending each material into the mixer according to the mass fraction mentioned above, and turning them evenly up and down, left and right, inside and outside, so that the materials can be fully mixed;

[0032] The third step: turntable granulation, first transport the material accounting for 30-40% of the total weight of the mixture to the disc granulator for granulation. The inclination angle of the turntable of the granulator is controlled at...

Embodiment 2

[0045] The first step: raw material treatment, first 30 parts by weight of modified sepiolite, 8 parts by weight of modified attapulgite, 1 part by weight of modified bentonite and 1 part by weight of heavy metal precipitant 200-300 mesh sieve, 22 parts by weight of fermented organic waste, 12 parts by weight of biochar mixture, 10 parts by weight of tea stems, passed through a 100 mesh sieve, and 16 parts by weight of calcium magnesium phosphate fertilizer passed through an 80 mesh screen;

[0046] The second step: mixing the materials, sending each material into the mixer according to the mass fraction mentioned above, and turning them evenly up and down, left and right, inside and outside, so that the materials can be fully mixed;

[0047] The third step: turntable granulation, first transport the material accounting for 30-40% of the total weight of the mixture to the disc granulator for granulation. The inclination angle of the turntable of the granulator is controlled at...

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Abstract

The invention relates to an environment-friendly passivator for heavy metals in farmland soil. The passivator comprises clay mineral materials, organic materials, a precipitating agent and fertilizer, wherein the clay mineral materials are composed of, by weight, 25 to 30 parts of modified meerschaum, 5 to 8 parts of modified attapulgite and 0.7 to 1.0 part of modified bentonite; the organic materials are composed of, by weight, 20 to 25 parts of fermented organic waste, 8 to 12 parts of a biochar mixed material and 10 to 15 parts of tea stems; the precipitating agent is composed of, by weight, 0.8 to 1. 0 part of a heavy metal precipitating agent; and the fertilizer is composed of, by weight, 15 to 20 parts of calcium magnesium phosphate fertilizer. The invention also discloses a preparation method and application method for the environment-friendly farmland soil heavy metal passivator. The main components of the passivator are natural materials, so the passivator does not produce secondary pollution; and the passivator has good passivation effect on heavy metals in farmland soil and can increases both the organic matter content and cation exchange quantity of the soil, prevent and treat soil hardening, effectively improve soil texture, adjust soil porosity, provide necessary nutrients for the survival of microorganisms, improve the physical and chemical properties and microflora of soil, and enhance soil productivity.

Description

technical field [0001] The invention relates to the field of farmland soil environmental protection and restoration, in particular to the preparation and use method of an environment-friendly farmland soil heavy metal passivator. Background technique [0002] In recent years, with the continuous reports of "cadmium rice" incidents, the control of heavy metal pollution in farmland soil has also become the focus of ensuring food security and implementing people's livelihood issues. As for the quality of farmland soil environment, it can be seen from the first national soil pollution survey (April 2005 to December 2013) that the overall soil environment is not optimistic. Soil pollution is heavier than in the north. [0003] The environmental quality of farmland soil is seriously polluted by heavy metals. The Ministry of Agriculture’s Key Laboratory of Agricultural Product Pollution Prevention conducted land surveys in 24 provinces and cities across the country, and found tha...

Claims

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Application Information

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IPC IPC(8): C05G3/04C09K17/40A01C21/00C09K101/00C05G3/80
CPCA01C21/00C05D9/00C05G3/80C09K17/40C09K2101/00C05F11/00C05G1/00
Inventor 周芬张亚楠何允玉吕慧峰冯国勇
Owner NANJING SREMOL ENVIRONMENTAL TECH
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