Low-grade attapulgite raw ore heavy metal curing material and method for carrying out in-situ remediation on contaminated soil by using same

A technology of attapulgite and solidified materials, applied in the restoration of polluted soil, etc., can solve the problems of not being able to meet the market demand for remediation of heavy metal-contaminated soil, difficult to realize industrial application, and increase material costs, so as to improve adsorption performance, Strong ion exchange capacity and the effect of improving utilization efficiency

Active Publication Date: 2018-01-30
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, attapulgite ore is often accompanied by minerals such as quartz, opal, montmorillonite, illite, kaolinite, etc. If the attapulgite is purified, the material cost will be increased, and it is difficult to realize industrial application
Therefore, loading biochar on the purified attapulgite limits the scale of its industrialization and cannot meet the market demand for remediation of heavy metal-contaminated soil.

Method used

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  • Low-grade attapulgite raw ore heavy metal curing material and method for carrying out in-situ remediation on contaminated soil by using same
  • Low-grade attapulgite raw ore heavy metal curing material and method for carrying out in-situ remediation on contaminated soil by using same
  • Low-grade attapulgite raw ore heavy metal curing material and method for carrying out in-situ remediation on contaminated soil by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Evenly spray the low-grade attapulgite ore with a 1% compound acid solution (the mass ratio of citric acid: sulfuric acid is 1:3), which is twice the mass of the original ore, and let it air dry for more than 3 months. Pass through a 200-mesh sieve; mix acidified attapulgite and gutter oil at a mass ratio of 10:1, press filter and send it to a rotary kiln, and carbonize at 400°C for 2 hours under a nitrogen atmosphere; dry and sieve to obtain low-grade attapulgite Rod stone raw ore heavy metal solidified material, the mass moisture of the product is controlled below 10%.

[0028] Apply the heavy metal solidification material obtained in Example 1 to rice soil (contains 432 mg / kg Pb and 1.2 mg / kg Cd after testing), mix thoroughly and evenly, and apply 450 kg / mu of soil, and leave it for 3 days without disturbance. After testing, the contents of Pb and Cd in the leachate of solidified polluted soil were 43 mg / kg (limit value 80 mg / kg) and not detected (limit va...

Embodiment 2

[0029] Example 2: Evenly spray low-grade attapulgite with a mass concentration of 2% compound acid solution (wherein the mass ratio of oleic acid: sulfuric acid is 1:4), air-dry for more than 3 months, naturally air-dry, and pulverize 200-mesh sieve; acidified attapulgite and waste engine oil are mixed at a mass ratio of 8:1, filtered and sent to a rotary kiln, and carbonized at 400°C for 2 hours in a nitrogen atmosphere; dried and sieved to obtain low-grade asphalt Rod stone raw ore heavy metal solidified material, the mass moisture of the product is controlled below 10%.

[0030] The heavy metal solidified material obtained in Example 2 is applied to the field soil (containing Pb326mg / kg, Cd2.0mg / kg, As 283mg / kg after testing), fully mixed, and the amount of application is 500kg / mu of soil. The water volume is 20%, and 15 square meters per mu is irrigated, and then left without disturbance for 4 days. After testing the heavy metal-contaminated soil, the contents of Pb, Cd, ...

Embodiment 3

[0031] Example 3: Evenly spray the low-grade attapulgite with a mass concentration of 3% compound acid solution (wherein the mass ratio of acetic acid: sulfuric acid is 1:5) to the low-grade attapulgite, air-dry for more than 3 months, naturally air-dry, and pulverize over 200 Mesh sieve; acidified attapulgite and waste tallow fat are mixed at a mass ratio of 5:1, filtered and sent to a rotary kiln, and carbonized at 500°C for 3 hours under a nitrogen atmosphere; dried and sieved to obtain low-grade uneven Rod stone raw ore heavy metal solidified material, the mass moisture of the product is controlled below 10%.

[0032] The heavy metal solidified material obtained in Example 3 is applied to the polluted soil for planting medicinal materials (containing Pb331mg / kg, Cd1.6mg / kg, As340mg / kg after testing), fully mixed, and the amount of application is 500kg / mu of soil. The water content is 18%, and 10 square meters per mu is irrigated, and then left without disturbance for 7 day...

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Abstract

The invention discloses a low-grade attapulgite raw ore heavy metal curing material and a method for carrying out in-situ remediation on contaminated soil by using same. Attapulgite raw ore containingassociated minerals is taken as a carrier, waste oil is used as a carbon source, and the heavy metal curing material is prepared by adopting a one-step carbonization method. The attapulgite raw ore is subjected to calcination treatment, so that the micropore and mesoporous structures of attapulgite are activated, and the adsorption property of heavy metal ions in the soil is obviously improved. Furthermore, biochar is endowed with surface modified functional groups, thus achieving synergistic and complementary effects, and further enhancing the adsorption property of the heavy metal ions. Themethod provided by the invention utilizes the attapulgite raw ore containing the associated minerals to carry out remediation on the heavy metal contaminated soil, thus having wide application prospect in the aspect of remediation of the heavy metal contaminated soil.

Description

technical field [0001] The invention discloses a low-grade attapulgite raw ore heavy metal solidification material and a method for in-situ restoration of polluted soil, belonging to soil heavy metal restoration agents and restoration methods. technical background [0002] Soil heavy metal pollution has become a global environmental pollution problem. At present, the common heavy metal contaminated soil remediation technologies mainly include physical remediation, chemical remediation, biological remediation and agricultural regulation technology. Among them, chemical passivation / immobilization technology is widely used because it can quickly and significantly reduce the bioavailability and toxicity of heavy metals. Passivation technology mainly relies on passivating agents to reduce the mobility and bioavailability of heavy metals in soil, and make them exist in soil in a more stable form. At present, materials that can be used as heavy metal passivators / stabilizers inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 宗莉王爱勤牟斌王文波康玉茹朱永峰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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