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Method of utilizing microbial mineralization to treat copper slag to prepare building material

A technology of mineralization treatment and microorganisms, applied in the field of environmental material science, can solve the problems of insufficient utilization of copper slag, shorten the product cycle, reduce environmental pollution problems, and increase the effect of effective capture

Inactive Publication Date: 2017-08-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: The object of the present invention is to provide a method for preparing building materials by using microbial mineralization to treat copper slag. This method has the advantages of simple process, remarkable effect, low energy consumption, and environmental friendliness. Provide technical support methods to effectively solve the problem of insufficient utilization of copper slag

Method used

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  • Method of utilizing microbial mineralization to treat copper slag to prepare building material
  • Method of utilizing microbial mineralization to treat copper slag to prepare building material
  • Method of utilizing microbial mineralization to treat copper slag to prepare building material

Examples

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Effect test

example 1

[0031] (1) Copper slag, steel slag and lime are mixed into a composite gelling system according to the ratio of B1 number in Table 1, the fixed mortar ratio is 1:2, the water-cement ratio is 0.5, and the amount of microbial powder is 1.5%;

[0032] (2) Pour 450g of composite gelling material into a stirring pot and stir evenly, add the bacteria powder to 225g of water and stir evenly, then import it into the stirring pot and stir evenly, then add sand and continue stirring evenly, and pour the slurry into the mold Vibrated in the middle to form a test piece.

[0033] (3) Place the test piece in an environment with a relative humidity of 57% and a temperature of 18°C ​​for curing. After 1 day, the sample is demoulded to obtain a sample, and the sample is placed in a standard room with a relative humidity of 95% and a temperature of 18°C ​​for 3 days. Then in normal carbonation environment (CO 2 The volume fraction is 15%, the ambient temperature is 25° C., and the relative hum...

Embodiment 2

[0038] (1) Copper slag, steel slag and lime are mixed into a composite gelling system according to the ratio of C1 number in Table 1, the fixed mortar ratio is 1:3, the water-cement ratio is 0.5, and the amount of microbial powder is 1%;

[0039] (2) After pouring 450g of the composite gelling material into a stirring pot and stirring evenly, adding the bacteria powder into 225g of water and stirring evenly, then introducing it into the stirring pot and stirring evenly. Then add sand and continue to stir evenly, pour the slurry into a mold and vibrate to form a test piece.

[0040] (3) Put the test piece in an environment with a relative humidity of 60% and a temperature of 20°C for curing. After 2 days, the sample is demoulded to obtain a sample. The sample is placed in a standard room with a relative humidity of 96% and a temperature of 20°C for 2 days, and then In a high-pressure carbonization environment (at a humidity of 67%, CO 2Under the condition of pressure of 0.1MPa...

Embodiment 3

[0042] (1) Mix copper slag, steel slag and lime according to the ratio of B2 in Table 1 to form a composite cementitious system, wherein the mass ratio of copper slag: steel slag is 5:1, that is, copper slag 262.5g, steel slag 52.5g, fixed plastic sand The ratio is 1:3, the water-binder ratio is 0.4, and the amount of microbial powder is 2%;

[0043] (2) After pouring 450g of the composite gelling material into a stirring pot and stirring evenly, adding the bacteria powder into 180g of water and stirring evenly, then introducing it into the stirring pot and stirring evenly. Then add sand and continue to stir evenly, pour the slurry into a mold and vibrate to form a test piece.

[0044] (3) Put the test piece in an environment with a relative humidity of 63% and a temperature of 22°C for curing. After 1.5 days, the sample is demoulded to obtain a sample, and the sample is placed in a standard room with a relative humidity of 98% and a temperature of 20°C for 1.5 days. , follow...

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Abstract

The invention discloses a method of utilizing microbial mineralization to treat copper slag to prepare a building material. The method includes following steps: 1), well mixing and stirring the copper slag, steel slag and lime to obtain a composite cementing material, wherein the steel slag is used for reducing bleeding, and the lime is used for providing a calcium source; 2), pouring the composite cementing material into a stirring pot, adding a water solution of microbial powder and sand, stirring well to form a slurry, and vibrating for forming to obtain a test piece; 3), demoulding the test piece to obtain a sample, and maintaining the sample to obtain the building material. The copper slag is used as a main raw material, and microbial mineralization is used as an approach, so that effective utilization of waste like the copper slag is realized; the method is simple in preparation process, low in energy consumption and environment-friendly; the building material prepared by the method has certain mechanical strength, and the mechanical performance of the building material doped with the steel slag is improved obviously when compared with that of building materials made of copper slag only.

Description

technical field [0001] The invention relates to a method for preparing building materials by utilizing microbial mineralization to treat copper slag, and belongs to the field of environmental material science. Background technique [0002] Copper slag is mainly produced in the matte smelting process of copper concentrate. At present, the main copper smelting process in the world is matte smelting technology. The process is to enrich the copper in the copper concentrate into the copper matte as much as possible under the high-temperature oxidation atmosphere condition of 1150-1250°C, and enrich the associated iron oxide and gangue in the copper concentrate into the slag. Therefore, copper slag often contains high-grade iron, which mainly exists in the form of ferrous oxide, with a content of 25% to 30%. The high iron content makes copper slag often used to recycle iron and other metals; but for a long time However, the degree of resource utilization of copper slag is still i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/005C04B2111/00017C04B18/141C04B18/142C04B22/064C04B14/06C04B2103/0001
Inventor 钱春香苏依林伊海赫
Owner SOUTHEAST UNIV
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