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Remediation agent for treating nickel-cobalt-containing contaminated soil and preparation method and application thereof

A technology of polluted soil and remediation agent, which is applied in the field of remediation agent and its preparation for the treatment of nickel-cobalt-contaminated soil, to achieve the effects of improving mechanical properties, accelerating adsorption equilibrium speed, and increasing interlayer distance

Inactive Publication Date: 2019-08-13
HUNAN QUANZHIYUAN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing soil remediation agents have a certain remediation effect on heavy metal-contaminated soils, but it is still necessary to develop remediation agents that have better remediation effects on heavy metal-contaminated soils, especially cobalt-nickel-containing soils

Method used

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  • Remediation agent for treating nickel-cobalt-containing contaminated soil and preparation method and application thereof
  • Remediation agent for treating nickel-cobalt-containing contaminated soil and preparation method and application thereof
  • Remediation agent for treating nickel-cobalt-containing contaminated soil and preparation method and application thereof

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preparation example Construction

[0027] This specific embodiment also includes the preparation method of above-mentioned restorative agent, comprises the following steps:

[0028] 1) mixing clinoptilolite and gamma-polyglutamic acid with water to obtain a mixture, the total mass fraction of the clinoptilolite and the gamma-polyglutamic acid in the mixture is 10%-15%, the Clinoptilolite and the γ-polyglutamic acid are mixed according to the mass ratio of 10:1-3, and then ethylene glycol glycidyl ether with a mass fraction of 2% is added and reacted at 45-55°C to obtain a modified zeolite ; Wherein, the mass ratio of 2% ethylene glycol glycidyl ether to the gamma-polyglutamic acid is 5:0.1-0.2.

[0029] 2) Mix red mud and carbonate solids according to the mass ratio of 1:1-2 and stir evenly, then roast and react at 600-700°C for 1-3 hours, and then wash and dry to obtain modified red mud.

[0030] 3) Mix stabilizer phosphate, stabilizer carbonate, the modified zeolite prepared in step 1), and the modified red ...

Embodiment 1

[0036] The restorative agent in the present embodiment comprises the following components in parts by weight:

[0037] Stabilizer phosphate is 20 parts of potassium dihydrogen phosphate and 10 parts of calcium pyrophosphate;

[0038] Stabilizer carbonate is 20 parts of sodium carbonate and 10 parts of calcium carbonate;

[0039] 20 parts of sodium carbonate modified red mud;

[0040] 20 parts of modified zeolite.

[0041] The soil to be repaired in this example came from the soil of a ferronickel smelter in Ganzhou, Guangxi. The nickel, cobalt, and lead in the soil were tested to be higher than the "Soil Environmental Quality Construction Land Soil Pollution Risk Control Standard (Trial)" (GB36600-2018) The standards for the second type of land use control value, nickel, cobalt, and lead are in accordance with the "National Environmental Protection Standard of the People's Republic of China (HJ557-2010): Solid Waste Leaching Toxicity Leaching Method Horizontal Oscillation Me...

Embodiment 2

[0050] The restorative agent in the present embodiment comprises the following components in parts by weight:

[0051] Stabilizer phosphate is 25 parts of calcium dihydrogen phosphate and 5 parts of sodium hexametaphosphate;

[0052] Stabilizer carbonate is 25 parts of potassium dihydrogen carbonate and 5 parts of calcium carbonate;

[0053] 30 parts of calcium carbonate modified red mud;

[0054] 10 parts of modified zeolite.

[0055] The soil to be repaired in this example came from a chemical plant site in Yangjiang, Guangdong. The nickel, cobalt, and arsenic in the soil were tested to be higher than the second in the "Soil Environmental Quality Construction Land Soil Pollution Risk Control Standard (Trial)" (GB36600-2018) The standards for the control value of similar land use, nickel, cobalt, and arsenic are in accordance with the "National Environmental Protection Standard of the People's Republic of China (HJ557-2010): Solid Waste Leaching Toxicity Leaching Method Hor...

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Abstract

The invention relates to a remediation agent for treating nickel-cobalt-containing contaminated soil and a preparation method and application thereof. The remediation agent is prepared from, by weight, 5-35 parts of a stabilizer phosphate, 10-30 parts of a stabilizer carbonate, 10-35 parts of modified zeolite and 5-30 parts of modified red mud; the modified zeolite is prepared by the steps that water is added to clinoptilolite and gamma-polyglutamic acid for mixing to obtain a mixture, and then ethylene glycol glycidyl ether is added to the mixture for a reaction at 45-55 DEG C; the modified red mud is prepared by the steps that red mud and carbonate solids are mixed and calcined at 600-700 DEG C for a reaction. The remediation agent achieves the efficient stabilization of heavy metals such as nickel and cobalt in the soil. In addition, the invention provides the preparation method of the remediation agent and the application of the remediation agent in remediating the nickel-cobalt-containing contaminated soil.

Description

technical field [0001] The invention relates to the fields of environmental protection and engineering construction, in particular to a restoration agent for treating nickel-cobalt-containing contaminated soil, a preparation method and application thereof. Background technique [0002] A large amount of laterite nickel ore imported by China is mainly produced in Indonesia. The hydrometallurgical methods of laterite nickel ore include acid leaching, alkali leaching, high-pressure leaching, etc. During the extraction process, a large amount of hydrometallurgical solid waste is produced, and its main components are Gangue, and a certain amount of heavy metals such as nickel, cobalt, and copper remain at the same time, and there are large environmental risks in transportation, transfer, storage and landfill. The leaching toxicity of heavy metals is the main cause of environmental hazards caused by hydrometallurgical waste residues. Under the leaching effect of rainwater, especi...

Claims

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Application Information

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IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 马涛施盘晴周聪轩刘霞曹艳华李浩邹蓉
Owner HUNAN QUANZHIYUAN ENVIRONMENTAL PROTECTION SCI & TECH
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