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Inorganic polymer material for sealing heavy metal castoff

An inorganic polymer and waste technology, applied in solid waste management, sustainable waste treatment, cement production, etc., can solve the problems of difficulty in commercialization of inorganic silicon-aluminum polymer solid sealing materials, low strength, and decreased solid sealing efficiency. , to achieve the effect of excellent heavy metal solid sealing performance, broad application prospects and simple process

Inactive Publication Date: 2008-12-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After searching the existing literature, it was found that American Davidovits J. wrote "Geopolymers and geopolymeric newmaterials" in "Journal of Thermal Analysis" Volume 35, 1989, P 42-44. This article developed a geopolymer material in the laboratory , the molecular structure after hardening is a cage structure. Preliminary experiments show that the inorganic polymer material has a good sealing effect for heavy metals in the low concentration range, but the main raw material used in this material is pure metakaolin, and the synthesis temperature is 80 In the range of -100°C, the cost of the product is very high, the performance of the product fluctuates greatly, and the quality is not easy to be guaranteed; and the strength is generally low, and its physical encapsulation effect is poor, and only the chemical combination of heavy metal ions in the cage molecular structure makes it firm The number of combined heavy metal ions is greatly limited, and when the number of heavy metal ions exceeds a certain value, the immobilization efficiency drops significantly
All of these have brought great difficulties to the commercialization of inorganic silicon-aluminum polymer immobilization materials.

Method used

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  • Inorganic polymer material for sealing heavy metal castoff

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Metakaolin 35.1%

[0029] Fly Ash 0.4%

[0030] Slag 3.94%

[0031] Basic activator 10.6%

[0032] Sand 50.0%

[0033] The above components were prepared according to the aforementioned process to obtain an inorganic silicon-aluminum polymer sealing material, and its properties were measured as follows:

[0034] The compressive strength (28 days) is 32.9MPa, the flexural strength (28 days) is 6.71MPa, the encapsulation efficiency of Cu ions is 95.6%, and the encapsulation efficiency of Pb ions is 96.5%.

Embodiment 2

[0036] Metakaolin 27.3%

[0037] Fly ash 0.3%

[0038] Slag 11.82%

[0039] Basic activator 10.6%

[0040] Sand 50.0%

[0041] The above components were prepared according to the aforementioned process to obtain an inorganic silicon-aluminum polymer sealing material, and its properties were measured as follows:

[0042] The compressive strength (28 days) is 53.7MPa, the flexural strength (28 days) is 7.02MPa, the encapsulation efficiency of Cu ions is 97.1%, and the encapsulation efficiency of Pb ions is 97.5%.

Embodiment 3

[0044] Metakaolin 19.5%

[0045] Fly Ash 0.2%

[0046] Slag 19.7%

[0047] Basic activator 10.6%

[0048] Sand 50.0%

[0049] The above components were prepared according to the aforementioned process to obtain an inorganic silicon-aluminum polymer sealing material, and its properties were measured as follows:

[0050] The compressive strength (28 days) is 64.1MPa, the flexural strength (28 days) is 8.01MPa, the encapsulation efficiency of Cu ions is 98.3%, and the encapsulation efficiency of Pb ions is 98.9%.

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Abstract

The invention provides an inorganic polymeric material used to fixedly seal heavy metal wastes, which is an inorganic silicon-aluminum polymeric material used in the environmental protection field. The material comprises the following compositions in weight percentage: 9.9 to 35.1 percent of metakaolin, 3.94 to 27.6 percent of ore slag, 0.1 to 9.9 percent of active low calcium silicon-aluminum material, 9.6 to 10.6 percent of alkali excitant and 50.0 to 54.7 percent of sand. The material has the advantages of high doped quantity of the heavy metal wastes, high fixing seal efficiency, wide source of raw materials, convenient preparation and processing, high mechanical strength, excellent durability and low cost.

Description

technical field [0001] The invention relates to an inorganic silicon-aluminum polymer material used for solid sealing of heavy metal waste, specifically, for mine tailings, electroplating sludge, waste incineration fly ash, and industrial sewage where there is a risk of heavy metal ion leaching. The purpose of efficient solidification of waste such as waste is to reduce or avoid the pollution of heavy metal ions. Mainly used in the field of environmental protection. Background technique [0002] With the rapid development of my country's economy, the pollution problem is becoming more and more serious. Every year, a huge amount of waste water, waste gas, and waste residue are discharged into nature, causing serious environmental pollution. Among all kinds of waste, waste containing heavy metals (such as mining Factory tailings, electroplating sludge, waste incineration fly ash, industrial sewage, etc.) account for a large proportion. Taking industrial solid waste as an exam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/12C04B14/10
CPCC04B28/006C04B2111/00775C04B2111/10Y02P40/10Y02W30/91C04B14/02C04B14/041C04B14/106C04B18/141C04B20/0076C04B2103/10C04B14/06
Inventor 张云升贾艳涛
Owner SOUTHEAST UNIV
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