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Ceramsite coating additive with core-shell structure and application thereof

A core-shell structure and coating layer technology, applied in the field of polluted soil treatment, can solve problems such as unsatisfactory solidification effect of easily leached heavy metals, and achieve the effects of achieving harmless treatment, reducing leaching risk, and reducing porosity

Inactive Publication Date: 2020-04-24
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the curing effect of this technology on some easily leached heavy metals (such as chromium and cadmium) is not satisfactory, and needs to be strengthened.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) According to the proportioning of 40% and 60% by mass percentage, borax and waste glass powder are mixed to make additives;

[0036] (2) drying the clay-coated material, and then mixing 3wt% additive thereinto;

[0037] (3) Contaminated soil containing chromium (6000-15000mg / kg) is granulated and nucleated, and then the prepared core ball is moved into another ball forming disc, and the surface of the core ball is coated with clay package mixed with additives. Covering materials, made of core-shell structure ceramsite green embryos, aged for 24 hours after making ceramsite green embryos, so that the additives can fully react with the coating materials;

[0038] (4) Fire the ceramsite green body in step (3) under the following firing conditions: the heating rate is 15°C / min, the holding temperature is 420°C, the holding time is 25min, the sintering temperature is 1100°C, and the sintering time is 10min.

[0039] The bulk density of the ceramsite obtained in the pres...

Embodiment 2

[0042] (1) taking sodium carbonate as a flux and calcium hydroxide as a passivating agent, fully mixing the two components in equal proportions to make an additive;

[0043] (2) drying the fly ash coating material, and then mixing 8wt% additive therein;

[0044] (3) Contaminated soil containing lead (6000-15000mg / kg) is granulated and nucleated, and the prepared core ball is moved into another ball forming disc, and the surface of the core ball is coated with fly ash mixed with additives The cladding material is made into a core-shell structure ceramsite green embryo, which is aged for 24 hours after being made into a ceramsite green embryo, so that the additives and the cladding material can fully react;

[0045](4) The ceramsite green body of step (3) is fired, and the firing conditions are as follows: the heating rate is 10°C / min, the holding temperature is 450°C, the holding time is 35min, the sintering temperature is 1180°C, and the sintering time is 15min.

[0046] The ...

Embodiment 3

[0049] (1) According to the proportioning ratio of 40%, 35%, and 25% respectively according to the mass percentage, borax, sodium hydroxide, and ferrous sulfate are mixed to make additives;

[0050] (2) drying the shale powder coating material, and then adding 6wt% additive;

[0051] (3) The contaminated soil containing cadmium is granulated and nucleated, and then the prepared core ball is moved into another ball forming disc, and the surface of the core ball is coated with shale powder coating material mixed with additives to form a Core-shell structure ceramsite raw embryos, made of ceramsite green embryos, aged for 24 hours, so that the additives and coating materials can fully react;

[0052] (4) Fire the ceramsite green body in step (3), the firing conditions are as follows: the heating rate is 12°C / min, the holding temperature is 430°C, the holding time is 33min, the sintering temperature is 1130°C, and the sintering time is 18min.

[0053] The bulk density of the cera...

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Abstract

The invention discloses a core-shell structure ceramsite coating layer additive and an application thereof, which belong to the technical field of contaminated soil governing, the ceramsite coating layer additive comprises the following raw materials by mass: 20-90% of a fluxing agent; and 10%-80% of a passivating agent. The additive provided by the invention can further enhance the solid sealingeffect of the coating layer on heavy metals, reduce the porosity of a coating layer, increase the compactness of the coating layer, reduce the leaching risk of the heavy metals and realize harmless treatment.

Description

technical field [0001] The invention relates to the technical field of contaminated soil treatment, in particular to a core-shell structure ceramsite coating layer additive and its application. Background technique [0002] Soil is the most basic and important part of the ecosystem. However, with the development of economy and the advancement of urbanization and industrialization, the problem of soil pollution in my country is becoming more and more serious. The 2014 "National Soil Pollution Survey Bulletin" pointed out that the total exceeding rate of soil in the country is 16.1%, and the proportions of slightly, lightly, moderately and heavily polluted sites are 11.2%, 2.3%, 1.5% and 1.1%, respectively. The main type of pollution is inorganic type, followed by organic type, and the proportion of compound type pollution is relatively small. Heavy metals such as chromium, zinc, nickel, etc. The overall situation of the soil environment in the country is not optimistic. Som...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/02C04B33/132C04B41/85C04B41/87
CPCC04B18/027C04B33/132C04B41/009C04B41/5025C04B41/5037C04B41/85C04B41/87C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B41/4545C04B41/5006C04B41/5022C04B41/501C04B41/50C04B41/5014Y02P40/60
Inventor 杨雨玄李辉郑伍魁张静洁
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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