Anti-seepage iron tailings concrete and preparation method thereof

A technology for iron tailings and concrete, applied in the field of concrete, can solve problems such as the lack of research on impermeability and microscopic characteristics, alleviate the problem of land occupation and storage of tailings, improve impermeability and durability, and prevent secondary The effect of pollution

Active Publication Date: 2019-06-11
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the experimental research on iron tailings concrete at home and abroad mainly focuses on the mechanical properties, and there are few studies on the anti-seepage performance and microscopic characteristics.

Method used

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  • Anti-seepage iron tailings concrete and preparation method thereof
  • Anti-seepage iron tailings concrete and preparation method thereof
  • Anti-seepage iron tailings concrete and preparation method thereof

Examples

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preparation example Construction

[0034] A kind of preparation method of impervious iron tailings concrete of the present invention comprises the following steps:

[0035] Step 1: Crush the iron tailings to make a specific surface area of ​​340m 2 / kg, iron tailings powder with a fineness of 200-400 mesh;

[0036] Step 2: Weigh according to the following mass percentages: 60%-80% of iron tailings powder, 15%-25% of cement, and 5%-15% of water. After mixing iron tailings powder, cement and water, adopt centrifugal molding process and Iron tailings balls with a particle size of 5-16mm are made through natural conservation;

[0037] Step 3: Weigh according to the following mass percentages: 14%-17% of cement, 42%-52% of iron tailings balls, 28%-34% of iron tailings powder, 0.14%-0.17% of water reducing agent, and 0.28% of admixture ~0.34% and 5.2%~6.3% of water; the mass percentage of each component of the admixture is as follows: 20%~40% of calcium oxide, 20%~40% of calcium chloride and 30%~50% of sodium nitra...

Embodiment

[0044] The new anti-seepage tailings concrete is prepared from ordinary Portland cement, iron tailings balls, iron tailings powder, water, water reducing agent and admixture; the mass percentage of each component is as follows:

[0045]

[0046] Among them, the cement is 42.5# ordinary Portland cement with a density of 3000kg / m 3 ; The specific surface area of ​​iron tailings powder is 340m 2 / kg, the fineness is 200-400 mesh; the particle size of the iron tailings ball is 5-16mm, and it is formed by centrifugation from iron tailings powder, cement and water. Since the tailings ball is made of tailings powder as the main raw material, Therefore, the coarse and fine aggregates of concrete have good interfacial bonding ability, refine the internal pore structure of concrete, and improve the compactness. The invention adopts iron tailings powder to be centrifuged into iron tailings balls, which can seal toxic substances in the tailings balls and effectively prevent secondary p...

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Abstract

The invention relates to anti-seepage iron tailings concrete and a preparation method thereof. The concrete is prepared by replacing an ordinary concrete coarse aggregate with iron tailings balls, replacing a fine aggregate with iron tailings powder and adding an admixture, water and a water reducing agent. The concrete comprises the following components in percentage by mass: cement 14% to 17%, iron tailings ball 42% to 52%, iron tailings powder 28% to 34%, water reducing agent 0.14% to 0.17 %, admixture 0.28% to 0.34%, and water 5.2% to 6.3%. The admixture comprises the following componentsin percentage by mass: calcium oxide 20% to 40%, calcium chloride 20% to 40% , and sodium nitrate 30% to 50%. According to the invention, the concrete aggregate is replaced with iron tailings completely, that is, the replacement rate reaches 100%, thereby greatly improving the recovery and utilization ratio of the iron tailings, and turning the iron tailings, which is waste, into treasure. The added admixture effectively improves the gas permeation resistance and the chloride ion permeation resistance of the tailings concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete, and relates to an anti-seepage iron tailings concrete and a preparation method thereof. Background technique [0002] With the accelerated development of urbanization in our country, the demand for building materials has increased sharply, and the massive exploitation of natural resources such as natural sand and gravel has seriously damaged the ecological environment, and these resources are not renewable in the short term, making the contradiction of shortage of building resources increasingly prominent. Therefore, it is urgent to find suitable alternative materials. [0003] Tailings are solid wastes discarded by mining enterprises in the process of refining the main raw materials for metallurgy. They are generally stored in tailings ponds. A large amount of tailings not only pollutes the environment, but also occupies land resources. The application of mine tailings in the field of concrete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
Inventor 李艺邹越杨泽良张铭
Owner NORTHEASTERN UNIV
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