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A kind of river channel copper polluted sediment remediation agent and preparation method thereof

A technology for remediating medicaments and copper pollution, applied in sludge treatment, water pollutants, chemical instruments and methods, etc., can solve the problems of not really realizing the stabilization of river sediment and the increase of copper leaching concentration

Active Publication Date: 2021-08-20
GUANGDONG KAIYUAN ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When pH2 Exist in the form of precipitation, when pH>9, then form Cu(OH) 3 - Complexes, the solubility increases, when the pH value of the river sediment is greater than 9, it will cause copper to be leached more easily, so that the leaching concentration of copper will increase, and the stabilization of the river sediment after solidification will not be realized

Method used

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  • A kind of river channel copper polluted sediment remediation agent and preparation method thereof
  • A kind of river channel copper polluted sediment remediation agent and preparation method thereof
  • A kind of river channel copper polluted sediment remediation agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A river channel copper-contaminated bottom mud remediation medicament, the medicament includes the following raw materials in parts by weight:

[0031]

[0032]

[0033] The repair material is a mixture of modified polymeric iron aluminide and iron-based compound at a weight ratio of 0.8:1.0; the iron-based compound is Fe-containing 2+ salts of strong acids and weak bases.

[0034]The cement is composite portland cement, wherein the content of silicate is 20%; the sulfide is 2- of sulfates.

[0035] Each part of the modified polymeric iron aluminide includes the following raw materials in parts by weight:

[0036]

[0037] The preparation of the modified polymeric iron aluminide comprises the following steps:

[0038] 1) Add ferrous sulfate heptahydrate, sulfuric acid and aluminum sulfate into the reactor in parts by weight and stir while heating. The heating temperature is 50° C. to obtain a mixed solution A;

[0039] 2) Transfer the mixed liquid A obtaine...

Embodiment 2

[0047] A river channel copper-contaminated bottom mud remediation medicament, the medicament includes the following raw materials in parts by weight:

[0048]

[0049] The repair material is a mixture of modified polymeric iron aluminide and iron-based compound at a weight ratio of 0.85:1.0; the iron-based compound is Fe-containing 2+ salts of strong acids and weak bases.

[0050] The cement is composite portland cement, wherein the content of silicate is 25%; the sulfide is 2- of sulfates.

[0051] Each part of the modified polymeric iron aluminide includes the following raw materials in parts by weight:

[0052]

[0053] The preparation of the modified polymeric iron aluminide comprises the following steps:

[0054] 1) Add ferrous sulfate heptahydrate, sulfuric acid and aluminum sulfate into the reactor in parts by weight and stir while heating. The heating temperature is 55° C. to obtain a mixed solution A;

[0055] 2) Transfer the mixed liquid A obtained in step ...

Embodiment 3

[0063] A river channel copper-contaminated bottom mud remediation medicament, the medicament includes the following raw materials in parts by weight:

[0064]

[0065] The restorative material is a mixture of modified polymeric iron aluminide and iron-based compound at a weight ratio of 0.9:1.0; the iron-based compound is Fe-containing 2+ salts of strong acids and weak bases.

[0066] The cement is composite portland cement, wherein the content of silicate is 30%; the sulfide is 2- of sulfates.

[0067] Each part of the modified polymeric iron aluminide includes the following raw materials in parts by weight:

[0068]

[0069] The preparation of the modified polymeric iron aluminide comprises the following steps:

[0070] 1) Add ferrous sulfate heptahydrate, sulfuric acid and aluminum sulfate into the reactor in parts by weight and stir while heating. The heating temperature is 60° C. to obtain a mixed solution A;

[0071] 2) Transfer the mixed liquid A obtained in s...

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Abstract

The invention relates to the technical field of river bottom mud restoration, in particular to a river channel copper-contaminated bottom mud restoration agent and a preparation method thereof. The agent includes the following raw materials in parts by weight: 10-20 parts of cement, 6-10 parts of fine sand, shell poly 10-20 parts of sugar, 1-3 parts of sulfide, 1-5 parts of quicklime, 5-15 parts of ferrous ammonium sulfate, 5-20 parts of restoration materials, 50-70 parts of deionized water. The repairing agent of the present invention has a small dosage and high repairing efficiency when repairing the bottom mud soil. By using the modified polymeric iron aluminide and iron-based 2+ Reacts with OH‑ in water to form Fe(OH) 3 , Inhibit the immobilized sediment soil due to high pH value to activate cuprate ions, thereby reducing the pH value of the immobilized sediment soil and reducing the leaching of copper after soil passivation, and the combination of ammonium ions and hydroxide ions in water, so that the original After the cement is added, the pH value of the strongly alkaline bottom mud is reduced, and further assists and improves the effect of the agent of the present invention on bottom mud soil restoration as a whole.

Description

technical field [0001] The invention relates to the technical field of river bottom mud restoration, in particular to a river channel copper-polluted bottom mud restoration agent and a preparation method thereof. Background technique [0002] The traditional river heavy metal pollution control technologies mainly include physical restoration, chemical restoration and biological restoration. Among them, the chemical restoration agent is mainly cement. According to the experimental data, the sediment contaminated by copper is generally weakly acidic. The pH value was significantly higher than that of the control group without curing agent treatment, and the solidified sediment was strongly alkaline. When cement is used alone and the proportion of cement added is 10%, 15% and 20%, the greater the proportion of cement in the bottom mud restoration agent, the higher the pH of the bottom mud after solidification. When pH<9, copper mainly forms Cu(OH) 2 Exist in the form of pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F101/20
CPCC02F11/008C02F2101/20C02F2103/007
Inventor 罗颜荣李火均周普雄余勇麦泳诗
Owner GUANGDONG KAIYUAN ENVIRONMENT TECH
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