Heavy metal passivator for simultaneous passivation of farmland soil cadmium, lead and zinc and preparation method

A heavy metal passivation agent and heavy metal technology, applied in the field of soil improvement technology and environmental protection, can solve the problems of low cost of chemical in-situ passivation repair technology, reduced activity of heavy metals, immature repair technology, etc., and achieve simple preparation and use Effects of ease of operation, reduced mobility, enhanced passivation effect

Active Publication Date: 2016-02-03
INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical restoration mainly refers to engineering restoration, which mainly includes foreign soil mixing method, heat treatment method, electric restoration method, and vitrification fixation method. Although it is easy to operate and thorough, it is costly and can only be applied to a small area; Bioremediation technologies such as plants are low-cost and environmentally friendly, but the repair time is long, and the repair technology is not mature, so it is not suitable for farmland soil; the chemical in-situ passivation repair technology is low in cost and easy to operate, which can reduce the activity of heavy metals and avoid heavy metals. Hazards to Plant and Food Chain Health

Method used

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  • Heavy metal passivator for simultaneous passivation of farmland soil cadmium, lead and zinc and preparation method

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Effect test

Embodiment 1

[0038] A heavy metal deactivator for passivating cadmium, lead and zinc in farmland soil at the same time, the raw material components and their weight percentages are as follows:

[0039] Weathered coal 24%, calcined powder 28%, pyrite slag 22%, activated carbon 13%, calcium magnesium phosphate fertilizer 13%.

[0040] The weathered coal is natural lignite containing 30-50 wt% of humic acid, and the particle size of the weathered coal is 80-mesh sieve. Calcined powder is calcined powder passed through 80-mesh sieve. The main chemical components in calcined powder are calculated by weight percentage: 20-36% of magnesium carbonate, 20-23% of magnesium sulfate, 21-26% of magnesium oxide, 20-25.5% of calcium oxide, The rest are impurities containing minerals such as iron and manganese, which are products of calcined magnesite. Pyrite slag is pyrite slag powder passed through a 80-mesh sieve. The main chemical components in the pyrite slag are calculated by weight percentage: 55%...

experiment example

[0045] 1, this embodiment adopts indoor cultivation test, under constant temperature and humidity, in the heavy metal polluted soil that Cd, Pb, Zn are main pollutants, add passivating agent the passivating agent product of this invention. The culture vessel used in the test was a 500ml polyethylene plastic basin, and the heavy metal-contaminated soil used was 1kg (calculated as air-dried soil) of the polluted soil around the industrial and mining enterprises in Jinan, Shandong that had passed through a 2mm sieve. The heavy metal soil used in the test is equally divided into five equal parts and bottled, and the passivator product of the invention is added with different contents in each bottle, and the addition amount is 8% wt. 70wt% of the water holding capacity, put it into an incubator, cultivate at a constant temperature of 25°C for 1 month, extract with DTPA extract, and calculate the content of effective heavy metals in the treated soil. The content of available heavy m...

Embodiment 2

[0048] A heavy metal deactivator for passivating cadmium, lead and zinc in farmland soil at the same time, the raw material components and their weight percentages are as follows:

[0049] Weathered coal 20%, calcined powder 30%, pyrite slag 25%, activated carbon 15%, calcium magnesium phosphate fertilizer 10%.

[0050] Preparation method, with embodiment 1.

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Abstract

The present invention relates to a heavy metal passivator for simultaneous passivation of farmland soil cadmium, lead and zinc, the heavy metal passivator comprises the following components and raw materials by weight: 15 to 25% of weathered coal, 15 to 30% of calcined powder, 15 to 25% of iron pyrite slag, 10 to 15% of activated carbon and 10-15% of calcium magnesium phosphate; the weathered coal and the activated carbon and the calcined powder and the iron pyrite slag are first mixed, stirred evenly, then mixed with the calcium magnesium phosphate, and fully stirred for evenly mixing to obtain the heavy metal passivator for simultaneous passivation of farmland soil cadmium, lead and zinc. The heavy metal passivator for simultaneous passivation of farmland soil cadmium, lead and zinc can make heavy metal pollutants stable in a long term so as to reduce heavy metal mobility and weaken heavy metal hazards in soil, and can effectively passivate and stabilize heavy metals in the soil, material dosing sequence can be quickly combined with the heavy metals, the reaction is more fully, and the heavy metal stabilizing effect is better.

Description

technical field [0001] The invention relates to a heavy metal passivator for simultaneously passivating cadmium, lead and zinc in farmland soil and a preparation method thereof, belonging to the technical fields of soil improvement technology and environmental protection. Background technique [0002] Heavy metal pollution is one of the main types of soil pollution. Worldwide, due to the discharge of industrial and mining waste and the excessive use of agricultural chemicals, toxic heavy metals in the soil around industrial and mining areas and agricultural soil have accumulated excessively, posing serious environmental and health risks. Therefore, soil heavy metal pollution remediation technology has attracted much attention. [0003] The remediation technology of soil heavy metal pollution mainly includes physical, biological and chemical remediation, and each remediation method has advantages and disadvantages. Physical restoration mainly refers to engineering restorati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K101/00
Inventor 井永苹李彦黄现民胡浩薄录吉张英鹏
Owner INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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