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Method for preparing curing agent from concrete waste residues

A technology of concrete waste residue and curing agent, which is applied in chemical instruments and methods, applications, fertilizer mixtures, etc., can solve the problem of less recovery of cementitious material particles, and achieve the realization of resource reuse, high-efficiency curing, and simple preparation process. Effect

Active Publication Date: 2021-09-21
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are some application studies of grinding and sieving concrete waste to recover fine powder, the overall recovery of residual cementitious material particles is small, and the recovered fine powder also plays the role of light aggregate in the process of use

Method used

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  • Method for preparing curing agent from concrete waste residues
  • Method for preparing curing agent from concrete waste residues
  • Method for preparing curing agent from concrete waste residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Influence of the mass ratio of humus soil and concrete waste residue on the performance of the prepared curing agent

[0020] Preparation of curing agent: as figure 1 As shown, according to the mass ratio of humus soil and concrete waste residue is 1:100, 1.5:100, 2:100, 2.5:100, 10:100, 17.5:100, 18.5:100, 19.5:100, 20:100 respectively Mix the two, and then dry at 50°C to obtain organic-mixed concrete waste, grind the organic-mixed concrete waste for 0.5 hours, pass through a 200-mesh sieve, and the sieved part obtained is mechanical organic-mixed powder; according to phosphogypsum, red mud The mass ratio of mechanical and organic mixed powder is 2.5:5:100. Mix the three, and then place them in a microwave vacuum atmosphere sintering furnace for activation. After activation, cool to room temperature. Take out the activated mixture and grind it into powder. Mesh sieve, the sieved part obtained is the curing agent, wherein the activation time is 1 hour, and the activati...

Embodiment 2

[0029] Effect of mass ratio of phosphogypsum, red mud and mechanical organic powder on the performance of the prepared curing agent

[0030] Preparation of curing agent: Mix humus and concrete waste residue at a mass ratio of 17.5:100, then dry at 100°C to obtain organic-mixed concrete waste, grind organic-mixed concrete waste for 2.5 hours, pass through 300 mesh Sieve, the sieved part obtained is mechanical organic mixed powder; according to the mass ratio of phosphogypsum, red mud and mechanical organic mixed powder is 2.5:2.5:100, 2.5:3.5:100, 2.5:4.5:100, 1:5: 100, 1.5:5:100, 2:5:100, 2.5:5:100, 7.5:5:100, 12.5:5:100, 2.5:15:100, 7.5:15:100, 12.5:15:100, 2.5:25:100, 7.5:25:100, 12.5:25:100, 13:25:100, 14:25:100, 15:25:100, 12.5:26:100, 12.5:28:100, 12.5: Mix the three at a ratio of 30:100, then place them in a microwave vacuum atmosphere sintering furnace for activation, cool to room temperature after activation, take out the activated mixture and grind it into powder, pa...

Embodiment 3

[0037] Influence of Microwave Heating Activation Time on the Properties of the Prepared Curing Agent

[0038] Preparation of curing agent: Mix humus and concrete waste residue at a mass ratio of 17.5:100, then dry at 150°C to obtain organic-mixed concrete waste, grind organic-mixed concrete waste for 4.5 hours, pass through 400 mesh Sieve, the sieved part obtained is mechanical organic mixed powder; according to the mass ratio of phosphogypsum, red mud and mechanical organic mixed powder is 12.5:25:100, the three are mixed, and then placed in a microwave vacuum atmosphere sintering furnace for activation. Cool to room temperature after activation, take out the activated mixture and grind it into powder, pass through a 400-mesh sieve, and the sieved part obtained is the curing agent, and the activation time is 0.5 hours, 0.7 hours, 0.9 hours, 1 hour, 2.5 hours, 4 hours, 4.5 hours, 5 hours, 6 hours, the activation temperature is 1000°C.

[0039] The heavy metal contaminated soi...

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Abstract

The invention discloses a method for preparing a curing agent from concrete waste residues, wherein the method comprises the following steps: mixing humus soil and concrete waste residues, drying to obtain organic doped concrete waste residues, grinding, and sieving to obtain mechanical organic doped powder; and mixing ardealite, red mud and the mechanical organic doped powder, placing the mixture in a microwave vacuum atmosphere sintering furnace to be activated, taking out the activated mixture, grinding, and sieving to obtain the curing agent. On the basis of the component characteristics of the concrete waste residues, humus soil, red mud and ardealite are used as admixtures, reaction of all the components of the raw materials is achieved through mechanical grinding, microwave irradiation, cooling, sieving and the like, the obtained curing agent can achieve efficient curing of heavy metal contaminated soil, the lowest leaching concentrations of Cd, Hg and As in the contaminated soil curing body are all lower than 0.1 mg / L, and the highest strength of a cured body in 28 d can reach 49.75 MPa; and resource reutilization of the concrete waste residues can be achieved, the needed raw materials are wide in source, and the preparation process of the curing agent is simple.

Description

technical field [0001] The invention relates to a preparation method of a solidifying agent for heavy metal polluted soil, in particular to a method for preparing a solidifying agent by utilizing concrete waste residue. Background technique [0002] According to statistics, every cubic concrete produced produces about 0.04 tons of waste residue, and China's concrete production industry produces more than 90 million tons of concrete waste residue every year, with a huge stockpile. According to the source, concrete waste is divided into wet waste and dry waste. Concrete slag consists of three parts: fine aggregate, hydration products and residual cementitious material particles. At the same time, the concrete waste slag has a high pH value and contains heavy metal pollutants, which is harmful to the environment. [0003] At present, the utilization methods of concrete waste slag include wet slag reuse, production of blocks and unburned bricks, preparation and backfilling of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/00C04B7/24C04B7/36C09K17/40
CPCC04B12/005C04B7/246C04B7/24C04B7/36C09K17/40C04B2111/00767C04B2111/00732Y02W30/91
Inventor 黄涛张树文宋东平金俊勋周璐璐徐娇娇
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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