Curing-stabilization chemical for restoring arsenic-polluted soil and preparation method and application of curing-stabilization chemical

A soil remediation and stabilization technology, applied in the field of soil remediation, can solve problems such as significant remediation effect, low arsenic pollution, and few soil remediation agents

Inactive Publication Date: 2017-05-31
HUNAN AIRBLUER ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the above scheme removes heavy metals in the soil, it increases the content of heavy metals in the atmosphere, causing air pollution, and does not solve the fundamental problem
[0004] The soil amendment method is currently a relatively common method of soil restoration, but commercial restoration agents imported from abroad are usually expensive and not suitable for large-sc

Method used

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  • Curing-stabilization chemical for restoring arsenic-polluted soil and preparation method and application of curing-stabilization chemical
  • Curing-stabilization chemical for restoring arsenic-polluted soil and preparation method and application of curing-stabilization chemical

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preparation example Construction

[0040] The present invention provides the preparation method of described curing-stabilizing agent, comprises the following steps:

[0041] The oxidizing agent, curing agent, stabilizer, additive and synergist are pulverized into powder with a particle diameter of 40-100 mesh, and stirred to obtain a curing / stabilizing agent.

[0042] In the present invention, the pulverization method is not particularly limited, and any pulverization method known to those skilled in the art can be used. The particle size of the pulverized powder is preferably 50-80 mesh, more preferably 60 mesh.

[0043] In the present invention, the stirring method is not particularly limited, and a stirring method well known to those skilled in the art can be used. The stirring speed is preferably 20-50 rpm, more preferably 30 rpm.

[0044] In the present invention, bagging is preferably carried out after the stirring. The charge amount is preferably 50-100kg / bag.

[0045] The invention provides the app...

Embodiment 1

[0049] Choose oxidizing agent to be lime, weigh its percentage by mass to be 15%; Choose curing agent to be fly ash, weigh its percentage by mass to be 20%; Choose stabilizing agent to be ferric chloride, weigh its percentage by mass to be 45%; Select The additive is polyferric sulfate, and its weight percentage is 10%; the synergist is humic acid, and its weight percentage is 8%. Lime, fly ash, ferric chloride, polyferric sulfate and humic acid were pulverized to obtain 50-mesh powder. Put the ground powder in five silos respectively; weigh and measure according to the ratio and send it to the mixing device by the belt conveyor; send it to the bagging and packaging device after mixing; use a forklift to transport the product Transport to warehouse for storage.

Embodiment 2

[0051] Choose oxidant as magnesium lime, weigh its mass percentage as 10%; choose solidifying agent as iron oxide and steel slag (mass ratio is 1:3), weigh its mass percentage as 40%; choose stabilizer as ferric chloride , sodium thiosulfate and sodium binitrite (mass ratio is 4:1:3), and its mass percent by weighing is 22%; Selecting additive is polyferric sulfate, polyferric chloride and ferrous chloride (mass ratio is 1:1:1), weighing its mass percentage as 35%; selecting the synergist as polyaspartic acid, weighing its mass percentage as 3%. Pulverize magnesium lime, iron oxide, steel slag, ferric chloride, sodium thiosulfate, sodium binitrite, polyferric sulfate, polyferric chloride, ferrous chloride, and polyaspartic acid to obtain 80-mesh powder . Put the ground powder in the silo respectively; weigh and measure according to the ratio and send it to the mixing device by the belt conveyor; send it to the bagging and packaging device after mixing; transport the product t...

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Abstract

The invention provides a curing-stabilization chemical for restoring arsenic-polluted soil. The curing-stabilization chemical comprises, by weight percentage, 10-15% of an oxidizing agent, 20-40% of a curing agent, 22-45% of a stabilizing agent, 10-35% of additives and 3-8% of a synergist. By means of the curing-stabilization chemical, the existing form of arsenic is changed, the arsenic is fixed into the soil through the oxidoreduction effect, the precipitation effect and the adsorption effect, and chemical properties of the arsenic are stabilized; mobility and bio-availability of the arsenic are lowered; and through five types of synergistic interaction effects, the restoration effect is good. The arsenic-polluted soil is treated and restored with the chemical; the total arsenic concentration of arsenic slag sample leachate is 294 mg/L, and the pH value is 7.5; after treatment, the total arsenic concentration of the leachate is 2.3 mg/L, the pH value is 5.0, and the arsenic fixing rate is as high as 99.86%; and meanwhile, the restoration standard, namely 2.5 mg/L, specified in 'Standard for Pollution Control on the Security Landfill Site for Hazardous Wastes' is reached.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a curing-stabilizing agent for arsenic-contaminated soil remediation, a preparation method and application thereof. Background technique [0002] Soil arsenic pollution is ubiquitous in the world. For example, in natural minerals, common arsenic-containing minerals are: arsenopyrite / arsenopyrite (FeAsS), orthosiderite arsenite (FeAs 2 ), realgar (As 2 S 3 ), orpiment (As 2 S 3 ), arsenite (Cu 3 AsS 4 ), cobalt arsenite (CoAsS), nickel arsenite (NiAsS), etc. These arsenic-containing minerals are often associated with metal sulfide ores, and a large amount of arsenic remains in the soil during the mining and processing of minerals. Most antimony ores in my country contain arsenic, and the arsenic-removing scum produced when adding soda ash to remove arsenic during the antimony smelting and refining process and the secondary arsenic-alkali slag produced b...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 游建军钟儒波胡志鑫曾睿唐传祥陈丹
Owner HUNAN AIRBLUER ENVIRONMENTAL PROTECTION TECH
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