Water-channel copper-polluted sediment repairing agent and preparation method thereof

A technology for remediation of chemicals and copper pollution, applied in water pollutants, sludge treatment, chemical instruments and methods, etc., can solve the problems of rising copper leaching concentration, failure to truly stabilize river sediments, and reduce the leaching concentration. , easy control, high repair efficiency

Active Publication Date: 2019-07-26
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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  • Water-channel copper-polluted sediment repairing agent and preparation method thereof
  • Water-channel copper-polluted sediment repairing agent and preparation method thereof
  • Water-channel copper-polluted sediment repairing 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 sediment repairing, in particular to a water-channel copper-polluted sediment repairing agent and a preparation method thereof. The ageing comprises, by weight, 10-20 parts of cement, 6-10 parts of fine sand, 10-20 parts of chitosan, 1-3 parts of sulfide, 1-5 parts of quicklime, 5-15 parts of ammonium ferrous sulfate, 5-20 parts of a repairingmaterial and 50-70 parts of deionized water. The water-channel copper-polluted sediment repairing agent has the advantages of less dosoage and high repairing efficiency in repairing of sediment soil;modified polymeric iron aluminides is reacted with an iron-based compound containing Fe<2+> and OH<-> in water into Fe(OH)3, the sediment soil solidified is inhibited from activating copper and acid ions due to high pH value, and the pH value of the sediment soil solidified and leaching of copper after soil passivation are reduced; the combination of ammonium ion and hydrogen and oxygen in water reduces the pH value of strong alkaline sediment after adding cement, and and the repairing effect of agent on the sediment soil is further improves 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 Applications(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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