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Clay mineral-based trace element regulator used for treating rice field cadmium pollution

A technology of clay minerals and trace elements, applied in the restoration of polluted soil, soil conditioning materials, application, etc., can solve the problems of unstable effect, soil compaction, rice production reduction, etc., achieve low price, improve soil, and reduce cadmium. Effect

Pending Publication Date: 2017-04-26
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only temporarily changes the form of Cd, and the Cd retained in the soil is easily reactivated and endangers rice.
Since the interaction relationship between various trace elements in the soil-rice system is not fully considered, the method has unstable effects in practical application, causing rice yield reduction, disease, soil compaction, etc., and the cost is high, which is easy to cause secondary problems. Pollution

Method used

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  • Clay mineral-based trace element regulator used for treating rice field cadmium pollution
  • Clay mineral-based trace element regulator used for treating rice field cadmium pollution
  • Clay mineral-based trace element regulator used for treating rice field cadmium pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Raw material composition:

[0027]

[0028] 2. Preparation process:

[0029] A Pass all the raw materials through a 100-mesh sieve, add water and stir evenly according to the proportion and weight, and the water-solid ratio is 1:1-3:1.

[0030] B Transfer the mixed raw materials to the reaction kettle.

[0031] C React the reactor with the saturated vapor pressure of 160-230°C for 12-24h, and cool naturally.

[0032] D Take out the product in the reaction kettle, dry it, and pulverize it to get the finished product.

Embodiment 2

[0034] 1. Raw material composition:

[0035]

[0036]

[0037] Prepare according to the same method as in Example 1.

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Abstract

The invention relates to a clay mineral-based trace element regulator used for treating rice field cadmium pollution. The clay mineral-based trace element regulator comprises the following raw materials: 8-16 weight parts of EDTA.Na2Mn, 0.5-3 weight parts of silicon dioxide, 24-32 weight parts of zinc sulfate, 1-5 weight parts of magnesium sulfate, 0.4-1.2 weight parts of ferrous sulfate, 0.6-1.4 weight parts of calcium oxide, and 80-160 weight parts of clay mineral. The rice field cadmium pollution treatment technology is based on environmental geochemistry and an antagonism principle, on one hand, by increasing the pH value of the soil and changing the soil cadmium occurrence mode, bio-availability of the soil cadmium is reduced, on the other hand, by reducing the rice cadmium absorption through element antagonism, so that the remediation effect and efficiency are ensured.

Description

technical field [0001] The invention relates to a clay mineral-based trace element regulator used for the control of cadmium pollution in paddy fields. Background technique [0002] Cadmium (Cd) is a harmful element with strong mobility, low degradability, and easy accumulation in animals and plants, and is extremely toxic to humans. Rice is the most important food crop in my country, and more than 65% of the population takes rice as the staple food. In recent years, with the aggravation of cadmium pollution in rice fields in my country, a wide range of Cd-enriched rice has appeared. In Hunan, Guangdong and Zhejiang provinces, there have been serious incidents of rice Cd exceeding 10 times the food safety standard of my country. It has caused serious economic losses to my country's agricultural production and brought serious health risks to rice as a staple food group. How to safely use Cd to pollute farmland and reduce the Cd content of rice has attracted widespread attent...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
CPCC09K17/40B09C1/08
Inventor 陈卫平杨阳王美娥焦文涛彭驰
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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