Geopolymer curing material based on manganese tailings and preparation method of geopolymer curing material

A technology of curing materials and geopolymers, which is applied in the field of manganese tailings-based geopolymer curing materials and its preparation, can solve the problems of increased cement addition, high carbon footprint, and hindrance to cement hydration, and achieves internal Effects of increased friction angle, improved compressive strength, and accelerated decomposition

Active Publication Date: 2021-11-19
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are two main problems in the actual application process: high carbon footprint and hysteresis reaction. Specifically, heavy metals and calcium hydrates will form a dense composite film, which hinders cement hydration, and during cement hydration, when the p

Method used

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  • Geopolymer curing material based on manganese tailings and preparation method of geopolymer curing material
  • Geopolymer curing material based on manganese tailings and preparation method of geopolymer curing material
  • Geopolymer curing material based on manganese tailings and preparation method of geopolymer curing material

Examples

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Embodiment 1

[0023] 1. Selection of raw materials:

[0024] 1. Polymetallic polluted soil

[0025] The polymetallic-contaminated soil in this example was taken from a lead-zinc smelting site in Zhuzhou City, Hunan Province. The contaminated soil was collected from the surface layer at 0-20 cm. The soil sample was mixed evenly, sand, stones, roots and other debris were removed, and the soil was passed through a 2mm sieve. Dry and set aside. The total amounts of Pb, Zn, As, and Cd in the tested soil were 2939.12, 28697.17, 566.06, and 233.45 mg / kg, respectively. The contents of these four heavy metals all exceeded the "Soil Environmental Quality Construction Land Soil Pollution Risk Control Standard" (GB36600-2018) The soil pollution risk screening value of the second type of land use needs to be repaired. The results of the leaching toxicity test of heavy metals in polluted soil showed that the leaching amounts of Pb, Zn, As, and Cd were 18.55, 665.47, 0.31, and 5.03 mg / kg, respectively, ...

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Abstract

The invention discloses a geopolymer curing material based on manganese tailings and a preparation method of the geopolymer curing material. The raw materials comprise a solid-state raw material and a liquid-state raw material, wherein the solid-state raw material comprises the following components in percentage by mass: 4.5-5.5% of cement, 4.5-5.5% of manganese tailings and 89-91% of multi-metal polluted soil, the liquid-state raw material is an aqueous solution containing an alkali activator and a water reducing agent, the mass concentration of the alkali activator is 1-2%, the mass concentration of the water reducing agent is 0.8-1.0%, and the solid-state raw material and the liquid-state raw material are mixed according to a water-cement ratio of 0.30-0.40. According to the invention, soluble SiO2, Al2O3 and Ca(OH)2 in manganese tailings are subjected to hydration reaction, so that kaolin, C-S-H, C-A-H and natrolite gel materials are continuously increased, and the compressive strength of a manganese tailing-based geopolymer solidified body is continuously improved; acidic oxides in manganese tailings can also promote dissolution of active glass bodies SiO2 and Al2O3, and hydration reaction is guaranteed; and the hydroxide of Mn has strong obligate adsorption capacity on Pb<2+> and Zn<2+>, and has a good physical wrapping effect on heavy metals such as Pb, Zn and the like.

Description

technical field [0001] The invention belongs to the technical field of polymetallic soil restoration, and in particular relates to a manganese tailings-based geopolymer solidified material and a preparation method thereof. Background technique [0002] With the upgrading of the non-ferrous metal industry, the city is retreating into the park, and the second is entering the third, leaving behind a large number of polluted sites, resulting in serious heavy metal pollution in the soil around the site. Heavy metal pollution in soil is often dominated by a certain heavy metal, accompanied by the presence of other elements, that is, compound pollution where multiple metals coexist. Polymetallic compound pollution poses a serious threat to food safety, drinking water safety, regional ecological environment, living environment health, sustainable economic and social development, and even social stability. Therefore, it is urgent to promote the research on the remediation of polymet...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00017C04B18/12C04B18/0472C04B22/00C04B2103/302C04B2103/402
Inventor 吴川薛生国何璇刘梓毓吕扬涛陈玥如
Owner CENT SOUTH UNIV
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