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All-solid waste cementing material as well as preparation method and application thereof

A technology of cementitious materials and application methods, applied in the direction of cement production, etc., can solve problems such as increased processing costs, complex raw materials and processes, road collapse, etc., and achieve the effect of increasing structural strength

Inactive Publication Date: 2021-07-23
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fundamental problems such as high levels of harmful components in industrial solid waste resources, poor performance of building materials, and low volume of solid waste have not been resolved.
[0003] Although the strength of the existing roadbed and pavement materials can meet the construction requirements, they are mixed with a large amount of cement, cement clinker or lime, or other admixtures in the application process, the production cost is high, and the cement The production process of cement clinker and lime will pollute the environment, which is not in line with the basic strategy of the country to protect the environment and achieve sustainable development, and cannot use a large amount of industrial solid waste
Moreover, since the strength in the later period has not been significantly improved, it cannot lay a good foundation for the overall quality of the highway project, and it is easy to cause deformation of the foundation under strong pressure loads in the later period, causing problems such as road collapse or cracks.
[0004] In the patent document with the publication number CN111847956A, a phosphogypsum-based cement retarder and its preparation method and application are disclosed. The phosphogypsum-based cement retarder can greatly reduce the influence of harmful substances in phosphogypsum on the setting time of cement; Lime and phosphogypsum will also carry out alkaline and sulfate excitation on slag powder or fly ash, which greatly improves the production efficiency of phosphogypsum-based cement retarder and reduces production costs; however, due to the addition of alkali metal components, the material's The processing cost is greatly increased
[0005] In the patent document whose publication number is CN111848101A, a large amount of phosphogypsum curing admixture and its application are disclosed. On the one hand, this kind of curing admixture can greatly increase the amount of phosphogypsum; The curing reaction can greatly improve the strength of the subgrade base and reduce water damage, but due to the need to increase some chemical reagents such as curing accelerators, the raw materials and processes become more complicated

Method used

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  • All-solid waste cementing material as well as preparation method and application thereof
  • All-solid waste cementing material as well as preparation method and application thereof
  • All-solid waste cementing material as well as preparation method and application thereof

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preparation example Construction

[0036] The invention provides an all-solid waste gelling material as well as a preparation method and application thereof.

[0037] The all-solid cementitious material includes 22.5% to 27.5% phosphogypsum, 22.5% to 27.5% calcium carbide slag, and 45% to 55% slag micropowder in terms of mass percentage, wherein the calcium carbide slag is ground to a particle size ≤ 280 μm and sieved through an 80 μm sieve Balance ≤ 20%, slag fine powder ground to particle size ≤ 212μm, specific surface area > 350m 2 / Kg, the phosphogypsum is ground to a particle size of ≤280 μm, and the sieve residue of 80 μm is ≤20%.

[0038] The preparation method of the all-solid cementitious material is roughly as follows: First, phosphogypsum and calcium carbide slag are mixed by mass percentage for 15 minutes and then calcined. During the calcining process, the heating rate is 5°C / min, and the temperature is raised to 800°C for 120min. The calcined product is ground to a particle size of ≤80 μm; then, ...

Embodiment 1

[0041] This embodiment is a method for preparing all-solid waste cementitious materials, the method comprising the following steps:

[0042] 1) According to mass percentage, 22.5% phosphogypsum and 22.5% calcium carbide slag were stirred and mixed for 15 minutes, and then calcined. During the calcining process, the heating rate was 5°C / min, and the temperature was raised to 800°C for 120min. Calcined to obtain a calcined product, and the calcined product was ground To particle size ≤ 80μm;

[0043] 2) Stir and mix the ground calcined product powder and 55% slag fine powder for 45 minutes.

[0044] A method for applying all-solid waste cementitious materials, the method comprising the steps of:

[0045] S1. Mix the soil to be treated with the all-solid waste roadbed pavement material at a dry weight mass ratio of 9:1, and mix evenly to obtain a mixture;

[0046] S2. Add water to the mixture according to the water-binder ratio of 2:1, stir and mix evenly at room temperature to...

Embodiment 2

[0051] This embodiment is a method for preparing all-solid waste cementitious materials, the method comprising the following steps:

[0052] 1) Mix 25% phosphogypsum and 25% calcium carbide slag by mass percentage for 15 minutes and then calcined. During the calcining process, the heating rate is 5°C / min, and the temperature is raised to 800°C for 120 minutes. Calcined to obtain a calcined product, and the calcined product is ground To particle size ≤ 80μm;

[0053] 2) Stir and mix the ground calcined product powder and 50% slag fine powder for 45 minutes.

[0054] A method for applying all-solid waste cementitious materials, the method comprising the steps of:

[0055] S1. Mix the soil to be treated with the all-solid waste roadbed pavement material at a dry weight mass ratio of 9:1, and mix evenly to obtain a mixture;

[0056] S2. Add water to the mixture according to the water-binder ratio of 2:1, stir and mix evenly at room temperature to form a glue mixture with uniform p...

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Abstract

The invention relates to the technical field of industrial waste recycling and road base materials, in particular to an all-solid-waste cementing material and a preparation method and application thereof. The all-solid-waste cementing material is prepared from, by mass, 22.5%-27.5% of phosphogypsum, 22.5%-27.5% of carbide slag and 45%-55% of superfine slag powder. The preparation method of the all-solid waste cementing material comprises the following steps: 1) stirring and mixing ardealite and carbide slag, and performing calcining to obtain a calcined product; 2) stirring and mixing the calcined product and the slag micro powder. The proportion design of the materials is reasonable; when the mixed calcined product of the ardealite and the carbide slag is mixed with the superfine slag powder for use, the activity of the mixed calcined product is excited under the action of the superfine slag powder, and the mixed calcined product is subjected to hydration reaction and pozzolanic reaction under the action of water, so that the roadbed and the pavement are cured and hardened by the reactions, the reaction product can also be filled into gaps of the roadbed pavement, so the structural strength of the roadbed pavement is improved.

Description

technical field [0001] The invention relates to the technical field of industrial waste recycling and road base materials, in particular to a solid waste gelling material and its preparation method and application. Background technique [0002] The discharge of industrial solid waste in my country is extremely large, and a large amount of industrial solid waste such as phosphogypsum, calcium carbide slag, and slag powder is produced nationwide every year. Relevant solid waste discharge enterprises must not only provide special sites to build storage yards, but also undertake large amounts of environmental protection Sewage tax, and it will pollute the surrounding environment, affecting the life and health of the surrounding residents, and the massive consumption and utilization of industrial solid waste is imminent. However, fundamental problems such as high levels of harmful components in industrial solid waste resources, poor performance of building materials, and low volum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/21C04B7/17C04B7/36C04B7/38C04B28/14
CPCC04B7/21C04B7/17C04B7/36C04B7/38C04B28/143C04B2111/0075C04B2111/00732C04B2201/50Y02P40/10
Inventor 李家茂张垂民司涛樊传刚
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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