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Curing agent for expansible heavy metal polluted clay as well as preparation method and using method of curing agent

A heavy metal and curing agent technology, applied in chemical instruments and methods, applications, soil conditioning materials, etc., can solve the problems of lack of economical and efficient special curing agent treatment design methods, heavy metal contaminated clay is immature, and affects the improvement effect, etc., to achieve Good economic and environmental benefits, good curing effect, beneficial to environmental protection

Active Publication Date: 2014-07-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When traditional alkaline curing agents are used to improve expansive heavy metal-contaminated clay, the presence of heavy metal ions will seriously hinder the hydration reaction of traditional alkaline curing agents, thereby affecting the improvement effect
[0005] At present, the research on the improvement of expansive heavy metal-contaminated clay is still immature, and the research on the physical and mechanical properties and leaching properties of heavy metal pollution is still in the exploratory stage. There is a lack of economical and efficient special curing agent and detailed and standardized treatment design methods.
If the improvement method of traditional expansive clay is adopted, such as mixing quicklime, cement, fly ash, sodium chloride, calcium chloride and phosphoric acid, etc., when the heavy metal content is low (total heavy metal content is less than 2000mg / kg), the improvement effect is still good. Meet the requirements; but when the heavy metal content is high (total heavy metal content greater than 2000mg / kg) and there are many types of heavy metals (two or more), the effect is not obvious

Method used

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  • Curing agent for expansible heavy metal polluted clay as well as preparation method and using method of curing agent
  • Curing agent for expansible heavy metal polluted clay as well as preparation method and using method of curing agent
  • Curing agent for expansible heavy metal polluted clay as well as preparation method and using method of curing agent

Examples

Experimental program
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Effect test

preparation example Construction

[0029] The preparation method of above-mentioned solidifying agent comprises the following steps:

[0030] Step 10): preparing modified carbide slag.

[0031] Step 10) specifically includes step 101)-step 104):

[0032] Step 101): drying the spent caustic slag so that the moisture content of the spent caustic soda slag is less than 2%, passing through a 1mm sieve, and then mixing the spent caustic soda slag with a sodium hydroxide solution with a molar concentration of 0.3-0.5mol / L according to the ratio of 1 kg of spent caustic soda slag and Mix the ratio of 1L sodium hydroxide solution, then add sodium dodecylsulfonate, stir evenly to obtain a cloudy liquid, wherein the quality of added sodium dodecylsulfonate is 1-3% of the quality of dry waste alkali residue ; Add sodium tripolyphosphate dispersant to the turbid solution, wherein the added sodium tripolyphosphate dispersant accounts for 3-5% of the quality of the dry waste alkali residue; then leave the turbid solution fo...

Embodiment 1

[0062] According to the preparation method of the present invention, the above-mentioned test materials are used to prepare the curing agent. The performance of the prepared curing agent is shown in Table 5.

[0063] The prepared curing agent was mixed with the expansive heavy metal-contaminated clay sample prepared in test material 3), and the amount of the curing agent was 3% (the curing agent accounted for the mass of the expansive heavy metal-contaminated clay sample). The water content is controlled at 18%-22%, and the three mixture soil samples that have been stirred evenly are sealed with a fresh-keeping bag and placed in a curing room at 24°C and 100% humidity for curing.

Embodiment 2

[0065] The preparation process was the same as in Example 1, except that the amount of curing agent was 4% (the curing agent accounted for the weight of the expansive heavy metal-contaminated clay sample).

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Abstract

The invention discloses a curing agent for expansible heavy metal polluted clay. The curing agent consists of the following component in percentage by weight: 60-70% of modified acetylene sludge, 10-20% of metakaolin and 10-20% of dead-burnt magnesium oxide. A preparation method of the curing agent comprises the following steps of: a step 10), preparing modified acetylene sludge; and a step 20), mixing metakaolin, dead-burnt magnesium oxide and the modified acetylene sludge, subsequently adjusting a water content to 40-50%, stirring for 10-15 minutes, evenly mixing the metakaolin, the dead-burnt magnesium oxide and the modified acetylene sludge, drying and sieving via a 2mm sieve to prepare the curing agent. The curing agent is suitable for the polluted clay with high content of the heavy metal and a plurality of heavy metal types; and the cutting agent has good curing effect for the pollution clay.

Description

technical field [0001] The invention relates to a modifier used in civil engineering or environmental geotechnical engineering, in particular to a curing agent used for expansive heavy metal-contaminated clay and a method for preparing and using it. Background technique [0002] Calcium carbide slag is the waste residue produced when calcium carbide is used to produce acetylene, an important chemical raw material. The main component is calcium hydroxide, and it also contains inorganic substances such as calcium carbonate, sulfur dioxide, sulfide, magnesium, iron and other metal oxides, hydroxides, and a small amount of organic matter. . Effective calcium oxide is generally above 60%, which meets the standard of grade III calcareous slaked lime in road engineering. Existing research shows that carbide slag is mostly used in road engineering materials, such as fly ash-carbide slag is completely qualified as a roadbed material and has a construction period Short and efficient....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/06
Inventor 杜延军魏明俐陈志龙朱晶晶杨玉玲
Owner SOUTHEAST UNIV
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