Artificial steel slag aggregate and preparation method and application thereof

A technology of aggregate and steel slag, which is applied in the field of artificial steel slag aggregate and its preparation, can solve the problems that the steel slag utilization rate is less than 20%, it is not conducive to environmental protection and resource conservation, and the industrial utilization of steel slag is difficult, so as to improve the carbonization efficiency and reduce the weight , the effect of enhancing the strength of the later stage

Pending Publication Date: 2021-01-26
NANJING UNIV OF TECH
View PDF7 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex composition of mineral phases and low chemical activity, it is difficult to use steel slag directly as a building material. In addition, steel slag contains a large amount of free calcium oxide and magnesium oxide. These components will cause volume deformation and cracking in the late stage of hydration and reaction expansion.
Due to the limitations of the above two main problems, the steel slag produced by steelmaking is difficult to be utilized industrially. According to reports, the accumulation of steel slag in my country has reached 1.2 billion tons in 2016, but the actual utilization rate of steel slag is less than 20%.
The method for preparing modified steel slag in this patent is complicated, and the modification requires sulfuric acid reaction; high and low temperature treatment; and the addition of modified bagasse, which is not conducive to environmental protection and resource conservation
The patent application with the publication num

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Artificial steel slag aggregate and preparation method and application thereof
  • Artificial steel slag aggregate and preparation method and application thereof
  • Artificial steel slag aggregate and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029]Example 1

[0030]A kind of artificial steel slag recycled aggregate reinforced by additives, seefigure 1 , The method includes the following steps: crushing the steelmaking tailings, putting the obtained crushed steelmaking tailings into a mill, and grinding to a specific surface area of ​​250m2 / g of steel slag powder, weigh 80 parts by mass of steel slag powder, 5 parts by mass of Portland cement, and 15 parts by mass of fly ash. A single-component admixture aqueous solution with a mass ratio of EDTA of 0.146wt.% was prepared. Use a granulator to add an aqueous solution of admixtures to the mixture with a mass water-cement ratio of 0.18 to form balls to obtain spherical artificial steel slag aggregates of 9-31.5 mm.figure 2 ; Then, the spherical steel slag aggregate obtained above is pre-cured for 4 days under the conditions of a relative humidity of 50% and a temperature of 20°C. After curing, the spherical steel slag aggregate with carbonized pre-structure is put into the car...

Example Embodiment

[0032]Example 2

[0033]An additive-enhanced artificial steel slag recycled aggregate. The method includes the following steps: crushing steelmaking tailings, putting the obtained crushed steelmaking tailings into a mill, and grinding to a specific surface area of ​​250m2 / g of steel slag powder, weigh 80 parts by mass of steel slag powder, 5 parts by mass of Portland cement, and 15 parts by mass of fine brick powder. A single-component admixture aqueous solution with a mass ratio of EDTA of 0.292wt.% was prepared. Use a granulator to add an aqueous solution of admixture to the mixture with a mass water-cement ratio of 0.18 to form balls to obtain spherical artificial steel slag aggregates of 9-31.5 mm; then, the above-obtained aggregate is treated at a relative humidity of 50% and a temperature of 20°C. The spherical steel slag aggregate is pre-cured for 3d. After the curing is completed, put the spherical steel slag aggregate with carbonized pre-structure into the carbonization kettle...

Example Embodiment

[0034]Example 3

[0035]An additive-enhanced artificial steel slag recycled aggregate. The method includes the following steps: crushing steelmaking tailings, putting the obtained crushed steelmaking tailings into a mill, and grinding to a specific surface area of ​​250m2 / g of steel slag powder, weigh 70 parts by mass of steel slag powder, 10 parts by mass of Portland cement, and 20 parts by mass of fly ash. A single additive aqueous solution with a mass ratio of acetic acid of 0.1 wt.% was prepared. Use a granulator to add an aqueous solution of admixture to the mixture with a mass water-cement ratio of 0.18 to form balls to obtain spherical artificial steel slag aggregates of 9-31.5 mm; then, the above-obtained aggregate is treated at a relative humidity of 50% and a temperature of 20°C. Pre-curing of spherical steel slag aggregate for 3d. After the curing is completed, put the spherical steel slag aggregate with carbonized pre-structure into the carbonization kettle, pass in 99.9 vo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an artificial steel slag aggregate and a preparation method and application thereof. The preparation method comprises the following steps: step 1, grinding steelmaking tailingsby using a ball mill to obtain uniform steel slag powder; 2, weighing Portland cement, an admixture fine powder and steel slag powder, and conducting uniform mixing to obtain an aggregate raw material; 3, preparing an additive aqueous solution; 4, putting the aggregate raw material into a ball forming mill, and uniformly spraying the additive aqueous solution prepared in the step 3 to form balls,so as to obtain spherical artificial steel slag aggregate; step 5, putting the pelletized aggregate into a closed environment or a natural environment for pre-curing; and step 6, putting the pre-cured aggregate into a carbonization device for carbonization treatment to finally prepare the artificial steel slag aggregate. The artificial steel slag aggregate prepared by the method can achieve the goals of safety and high strength, the crushing index of the aggregate can reach 9.26% and reach the I-grade aggregate use standard, the production process is simple, the solid waste is recycled, the carbon dioxide is absorbed and cured, and the artificial steel slag aggregate is free of burning, low-carbon and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an artificial steel slag aggregate and a preparation method and application thereof. Background technique [0002] In the iron and steel smelting process, for every ton of steel produced, 800-1500kg of by-product steel slag will be produced. The main mineral components of steel slag are dicalcium silicate, calcium silicon oxide, calcium aluminum oxide, and iron. Due to the complex mineral phase composition and low chemical activity, steel slag is difficult to use directly as building materials. In addition, steel slag contains a large amount of free calcium oxide and magnesium oxide. These components will cause volume deformation and cracking in the late stage of hydration and reaction expansion. Due to the limitations of the above two main problems, the steel slag produced by steelmaking is difficult to be industrially utilized. According to reports, the a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C04B18/02C04B18/14
CPCC04B18/021C04B18/142Y02W30/91
Inventor 莫立武杨硕刘朋邓敏黄蓓徐玲玲
Owner NANJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap