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Method for preparing volcanic ash active material from building residue soil

A technology of pozzolanic activity and construction slag, applied in cement production and other directions, can solve the problems of low clay backfill solidification strength, high moisture content, and inability to backfill, and achieve the effect of solving waste stacking, high utilization rate, and increasing benefits

Active Publication Date: 2021-06-18
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Clay is widely used in the preparation of ceramics, cement, ceramsite, etc. However, the waste clay at the construction site in Ningbo is construction waste with a high moisture content. As clay backfilling, the solidification strength is not high, and it cannot be backfilled. Abandonment will easily cause environmental pollution and other problems. , so the recycling of the construction waste clay needs to be solved urgently

Method used

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  • Method for preparing volcanic ash active material from building residue soil
  • Method for preparing volcanic ash active material from building residue soil
  • Method for preparing volcanic ash active material from building residue soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: the preparation method of pozzolanic active material of the present invention, comprises the following steps:

[0047] (1) Put Ningbo clay with the ingredients shown in Table 1 into an oven and dry it at 105°C for 24 hours to remove moisture;

[0048] (2) Anhydrous sodium sulfate is configured into a 20wt% aqueous solution;

[0049] (3) Put Ningbo clay into a mixer, then spray sodium sulfate aqueous solution, spray while stirring, and stir for 1-2 minutes to make a mixture. The mass ratio of Ningbo clay and sodium sulfate aqueous solution is 100:10.

[0050] (4) Calcining the above-mentioned mixture, the heating rate is controlled at 10° C. / min, the calcination temperature is 400° C., the holding time is 4 hours, and then the temperature is naturally cooled to room temperature.

[0051] (5) Put the above-mentioned calcined materials into a ball mill for ball milling, control 200-mesh sieve to less than 5% to obtain activated Ningbo clay, that is, pozzolan...

Embodiment 2

[0056] Embodiment 2: the preparation method of pozzolanic active material of the present invention, comprises the following steps:

[0057] (1) Put Ningbo clay in an oven and dry it at 105°C for 24 hours to remove moisture;

[0058] (2) Anhydrous sodium sulfate is configured into a 20wt% aqueous solution;

[0059] (3) Put Ningbo clay into a mixer, then spray sodium sulfate aqueous solution, spray while stirring, and stir for 1-2 minutes to make a mixture. The mass ratio of Ningbo clay and sodium sulfate aqueous solution is 100:10.

[0060] (4) Calcining the above mixture, the heating rate is controlled at 10° C. / min, the calcination temperature is 600° C., the holding time is 2 hours, and then the temperature is naturally cooled to room temperature.

[0061] (5) Put the above-mentioned calcined materials into a ball mill for ball milling, control 200-mesh sieve to less than 5% to obtain activated Ningbo clay, that is, pozzolan active material.

[0062] According to "GB / T 129...

Embodiment 3

[0066] Embodiment 3: the preparation method of pozzolanic active material of the present invention, comprises the following steps:

[0067] (1) Put Ningbo clay in an oven and dry it at 105°C for 24 hours to remove moisture;

[0068] (2) Anhydrous sodium sulfate is configured into a 20wt% aqueous solution;

[0069] (3) Put Ningbo clay into a mixer, then spray sodium sulfate aqueous solution, spray while stirring, and stir for 1-2 minutes to make a mixture. The mass ratio of Ningbo clay and sodium sulfate aqueous solution is 100:5.

[0070] (4) Calcining the above mixture, the heating rate is controlled at 5° C. / min, the calcination temperature is 800° C., the holding time is 1 hour, and then the temperature is naturally cooled to room temperature.

[0071] (5) Put the above-mentioned calcined materials into a ball mill for ball milling, control 200-mesh sieve to less than 5% to obtain activated Ningbo clay, that is, pozzolan active material.

[0072] According to "GB / T 12957-...

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Abstract

The invention provides a method for preparing a volcanic ash active material from building residue soil, the main component of the building residue soil is a clay substance with a particle size of less than 100 [mu] m, the main mineral phases are quartz, mica and chlorite, and the method comprises the following steps: drying the building residue soil to remove moisture; doping an activating auxiliary agent into the building residue soil, calcining, and cooling to room temperature; and ball-milling to obtain the volcanic ash active material. Main minerals in the activated building residue soil are converted into an amorphous state, the activated building residue soil has good hydrolysis capacity and reaction capacity, activity inspection is carried out on the activated building residue soil, data show that the activated building residue soil has pozzolanic activity, the 28-day compressive strength can reach about 100% of that of a standard cement mortar test block, the problem of resource reutilization of the waste building muck is solved, and the application direction of the waste building muck is expanded.

Description

technical field [0001] The invention relates to the field of resource utilization of inorganic solid wastes, in particular to a method for preparing pozzolanic active materials from construction dregs containing quartz, mica and chlorite mineral phases. Background technique [0002] Ningbo's soft soil is mostly coastal sedimentary plains, with a vast area covered by soft soil, and the construction sites are basically distributed on the soft soil layer. There are two main soft soil layers for urban buildings in Ningbo: the first layer is composed of Holocene marine silted argillaceous soil, which is relatively thick, has a large water content, and is mostly in a flow-plastic state, with a thickness of 2-20 meters; the second layer It is a Pleistocene marine deposit with a thickness of 28-45 meters. Its compressibility is lower than that of the first layer, and it is in a soft and plastic state. Ningbo soft soil has a sponge structure and large bedding structure. Because it c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/44
CPCC04B7/246C04B7/44Y02W30/91
Inventor 崔崇王志增崔晓昱丁锡锋张士华李天君
Owner NANJING UNIV OF SCI & TECH
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