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A kind of thermally desorbed organic polluted soil highly active cement admixture and its preparation method and application

A technology of organic pollution and thermal desorption, applied in the direction of cement production, etc., can solve the problems of unfavorable development of cement strength, influence of cement workability, application of difficult-to-mix materials, etc., achieve good promotion and application prospects, solve problems that cannot be digested, and reduce production cost effect

Active Publication Date: 2022-07-22
天津中材工程研究中心有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the bulk solid waste is used in cement, on the one hand, it is required that the solid waste has a certain activity and does not affect the early and late strength of the cement; Due to the low activity of desorbed polluted soil, it is unfavorable to the development of cement strength, and the high content of fine powder affects the workability of cement, so it is difficult to be used as admixture in cement

Method used

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  • A kind of thermally desorbed organic polluted soil highly active cement admixture and its preparation method and application
  • A kind of thermally desorbed organic polluted soil highly active cement admixture and its preparation method and application
  • A kind of thermally desorbed organic polluted soil highly active cement admixture and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Fully mix 90 kg of organic polluted soil and 1 kg of quicklime powder, and control the moisture content of the mixed material to be 20%, and then stir and mix 1 kg of iron powder with the above mixture and put it on the kiln conveyor belt. The melting agent is evenly sprinkled on the material on the conveyor belt and then enters the kiln. The temperature in the thermal desorption rotary kiln is controlled to be 400 °C, the material residence and desorption time is 5 minutes, and the material discharged from the kiln is cooled to 100 °C. to a specific surface area of ​​400m 2 / kg of mixed material powder for use. Refer to GB / T 1596-2017 "Fly ash used in cement and concrete" for activity and water demand ratio detection.

Embodiment 2

[0042]Fully mix 91 kg of organic polluted soil and 2 kg of quicklime powder, control the moisture content of the mixed material to be 18%, and then stir and mix 2 kg of iron powder with the above mixture and put it on the kiln conveyor belt. The melting agent is evenly sprinkled on the material of the conveyor belt and then enters the kiln. The temperature in the thermal desorption rotary kiln is controlled to be 450 °C, the material residence and desorption time is 8 minutes, and the material discharged from the kiln is cooled to 90 °C. to a specific surface area of ​​410m 2 / kg of mixed material powder for use. Refer to GB / T 1596-2017 "Fly ash used in cement and concrete" for activity and water demand ratio detection.

Embodiment 3

[0044] Fully mix 92 kg of organic polluted soil and 3 kg of quicklime powder evenly, control the moisture content of the mixed material to 15%, and then stir and mix 3 kg of iron powder with the above mixed material and put it on the kiln conveyor belt. The melting agent is evenly sprinkled on the material on the conveyor belt and then enters the kiln. The temperature in the thermal desorption rotary kiln is controlled to be 500 °C, the material residence and desorption time is 10 minutes, and the material discharged from the kiln is cooled to 80 °C. to a specific surface area of ​​420m 2 / kg of mixed material powder for use. Refer to GB / T 1596-2017 "Fly ash used in cement and concrete" for activity and water demand ratio detection.

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Abstract

The invention relates to a thermally desorbed organic polluted soil high-activity cement mixture and a preparation method and application thereof. The high-activity cement mixture comprises the following raw materials in parts by weight: 90-95 parts of organic polluted soil, 1-5 parts of quicklime powder, iron 1-5 parts of powder, 0.1-0.5 parts of flux accelerator. The preparation method is as follows: first, the organic polluted soil and the quicklime powder are fully mixed and stirred, then iron powder and a fluxing agent are respectively added and stirred evenly, and the material is thermally desorbed at a temperature of 400-600 DEG C in the rotary kiln, and then the process is completed. Chemical reaction, cooling and grinding to get the finished product. The invention has wide raw material sources, low cost, simultaneous thermal desorption and chemical reaction, and simple process; the product activity index reaches 102.5%, the water demand ratio is as low as 90%, and it can replace more than 30% of Portland cement; Good work performance, while solving the problem of contaminated soil absorption, it also has good economic benefits.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-activity cement admixture, in particular to a high-activity cement admixture of thermally desorbed organic polluted soil and a preparation method and application thereof. Background technique [0002] With the expansion of the scale of cities in my country, the original organic solvents, petroleum hydrocarbons, pesticides and other organic production enterprises have been gradually relocated, and the remaining factories have been polluted by organic substances to varying degrees; Hydrocarbon spills can also contaminate urban land; the volatile organic compounds and petroleum hydrocarbons in the above-mentioned contaminated soils pose a huge threat to the health of urban residents. The thermal desorption technology of organic contaminated soil adopts direct heating or indirect heating to heat the contaminated soil to a sufficient temperature to volatilize or separate the organic pollutan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/38C04B7/52
CPCC04B7/24C04B7/38C04B7/52Y02P40/10
Inventor 吴秋生范道荣李小燕王贺东
Owner 天津中材工程研究中心有限公司