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A solidification and stabilization agent for remediation of beryllium-contaminated soil and sediments

A technology for contaminated soil and sediments, applied in the field of solidification and stabilization agents, can solve the problems of no beryllium-contaminated soil treatment cases, no special repair agents for beryllium-contaminated soil, etc., and achieve simple preparation and use methods, low cost, and reduced Effect of Leaching Concentration

Active Publication Date: 2020-02-07
四川长虹格润环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, as of now, there has not been a case of remediation of beryllium-contaminated soil in the world, and there is no special remediation agent for beryllium-contaminated soil

Method used

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  • A solidification and stabilization agent for remediation of beryllium-contaminated soil and sediments
  • A solidification and stabilization agent for remediation of beryllium-contaminated soil and sediments
  • A solidification and stabilization agent for remediation of beryllium-contaminated soil and sediments

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preparation example Construction

[0026] The above-mentioned modified metakaolin can be prepared by the following method:

[0027] Weigh and mix metakaolin and calcium oxide at a mass ratio of 1:0.2 to 1:0.3, add water, control the liquid-solid mass ratio to 1 to 5, stir at a speed of 100 to 180r / min, and operate at 80°C to 100°C Hydrate for 6h-10h, then filter and dry to obtain modified metakaolin.

[0028] Compared with ordinary magnesium oxide, the particle size of activated magnesium oxide is finer, and the larger ratio of surface atoms to bulk atoms makes it have higher chemical activity and physical adsorption capacity, coupled with its own alkali properties, It can have a better adsorption effect on beryllium; preferably, 20-35 parts by mass of activated magnesium oxide; more preferably, 20-30 parts by mass of activated magnesium oxide.

[0029] Slag Portland cement is a hydraulic gel material made of Portland cement clinker, granulated blast furnace slag and appropriate amount of gypsum. Compared wit...

Embodiment 1

[0042] Preparation of modified metakaolin material: Weigh and mix metakaolin and calcium oxide at a mass ratio of 1:0.2, add water at a liquid-solid mass ratio of 2, and mature at 95°C for 8 hours. During this period, control the reaction stirring speed After the reaction is completed, filter and dry to obtain modified metakaolin.

[0043] The preparation of the curing and stabilizing agent in this embodiment is as follows: uniformly mix 40 parts by mass of modified metakaolin, 20 parts by mass of activated magnesium oxide and 40 parts by mass of slag Portland cement to obtain the compound for repairing beryllium-contaminated soil and sediments. Solidified Stabilizer.

Embodiment 2

[0045] Preparation of modified metakaolin material: Weigh and mix metakaolin and calcium oxide at a mass ratio of 1:0.3, add water at a liquid-solid mass ratio of 2, and hydrate at 95°C for 8 hours. During this period, the hydration reaction is controlled The stirring speed is 120r / min. After the reaction is completed, filter and dry to obtain the modified metakaolin.

[0046] The preparation of the curing and stabilizing agent in this embodiment is as follows: uniformly mix 30 parts by mass of modified metakaolin, 30 parts by mass of activated magnesium oxide and 40 parts by mass of slag portland cement to obtain a compound for repairing beryllium-contaminated soil and sediments. Solidified Stabilizer.

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Abstract

The invention discloses a curing and stabilizing agent for restoring beryllium-polluted soil and sediment, and belongs to the field of restoration of polluted soil. The technical scheme aims to provide the curing and stabilizing agent which is capable of effectively preventing beryllium in the soil from being activated and migrating so as to reduce the leaching concentration of beryllium in the soil. The curing and stabilizing agent is prepared from modified metakaolin, active magnesium oxide and portland slag cement, and an application method of the curing and stabilizing agent comprises thefollowing steps of: mixing a to-be-restored object with the curing and stabilizing agent, performing even stirring, regulating the moisture content, performing stirring and even mixing again, and finally performing curing for 2-7 days to an obtain restored object. Through the curing and stabilizing agent, the activation and migration of beryllium in the soil can be inhibited significantly, so thatthe leaching concentration of beryllium in the soil is reduced greatly, and dual protection of the soil environment and the water environment is achieved.

Description

technical field [0001] The invention belongs to the field of soil pollution remediation, and in particular relates to a curing and stabilizing agent for remediating beryllium-contaminated soil and sediments. Background technique [0002] Beryllium oxide ceramics are important basic materials in military fields such as nuclear industry and aerospace science and industry. With the continuous development of my country's military industry, the production and use of beryllium oxide will further increase. At the end of the last century, my country began to produce beryllium oxide ceramics, but limited by the production equipment, technology and environmental protection facilities at that time, pollutants such as beryllium oxide continued to accumulate in the soil. Although beryllium oxide has good chemical stability, as an amphoteric oxide, it is more likely to be activated and migrate under the promotion of acid rain, and once the beryllium-containing component enters the groundw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/10B09C1/08
CPCB09C1/08B09C2101/00C09K17/10
Inventor 李霞罗宏基李辉钟华萍杨毅宇范钦豪袁辉
Owner 四川长虹格润环保科技股份有限公司
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