Tailing sand two-component soil pavement sub-base layer mixture and preparation method thereof

A technology of tailings sand and subbase, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., to achieve the effect of reducing land, reducing the pressure on land resources, and increasing the difficulty of construction technology

Inactive Publication Date: 2012-07-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to further deepen the comprehensive utilization of tailings waste, that is, to solve the problem of recycling of ore dressing waste, to provide a tailings sand-mixed soil pavement sub-base layer mixture and its preparation method, so that the ore Select waste and turn waste into treasure, and use tailings sand to replace part of the filling materials, which reduces the consumption of natural resources such as non-renewable land and saves engineering costs

Method used

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  • Tailing sand two-component soil pavement sub-base layer mixture and preparation method thereof
  • Tailing sand two-component soil pavement sub-base layer mixture and preparation method thereof
  • Tailing sand two-component soil pavement sub-base layer mixture and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] A representative tailings sand sample was taken from a two-iron beneficiation tailings pond in Jiangning District, Nanjing City, and X-ray diffraction test of mineral composition and sample particle size analysis test were carried out respectively, as shown in Table 1 and Table 2.

[0021] Table 1 Analysis and detection results of chemical composition of tailings sand

[0022]

[0023] Table 2 tailings sand particle passing rate (%)

[0024]

[0025] From the perspective of material composition, the tailings sand is mainly composed of stable SiO 2 、Al 2 o 3 , Fe 2 o 3 Therefore, the tailings sand has good engineering stability and has engineering utilization value. At the same time, according to the individual characteristics of tailings sand particles, it can be judged that it is medium sand, and the distribution of particle groups is continuous, which meets the necessary conditions for road filling.

[0026] In this example, the physical and mechanical pro...

Embodiment 2

[0032] The used tailings sand chemical composition and particle group characteristics of the present embodiment are as described in Example 1, and are equally stable to tailings sand combined soil (iron beneficiation tailings sand-lime-cohesive soil) mixture subbase material and traditional lime fly ash respectively The physical and mechanical properties of soil subbase materials are tested and analyzed. The difference lies in the content of tailings sand, fly ash and cohesive soil in the two subbase materials. Among them: the weight percentage of each component of the tailings-sand mixed soil mixture is 24% of tailings sand, 8% of lime, and 68% of cohesive soil; the weight percentage of each component of lime fly ash stabilized soil is 8% of lime and 24% of fly ash , Clay soil 68%.

[0033] Table 4 shows the experimental performance test data of the two kinds of base layer materials in this embodiment.

[0034] Table 4 Experimental performance test data of two kinds of subba...

Embodiment 3

[0037] A kind of mixture of tailings sand and composite pavement subbase, which is composed of iron ore dressing tailings, lime, clay and water to form a mixture of two composite soil subbases. The weight percentages of iron ore dressing tailings, lime and clay are as follows:

[0038] Iron beneficiation tailings 15%~40%

[0039] Lime 5%~10%

[0040] Clay soil 50%~80%

[0041] The amount of water added is 5% to 20% of the total mass of iron beneficiation tailings sand, lime and clay,

[0042] In the present embodiment, the percentage by weight of iron dressing tailings sand, lime, clay can be: 15%: 5%: 80%, 40%: 10%: 50%, 30%: 10%: 60% or 20%: 8%: 72%; the addition of water is 5%, 20% or 10% of the total mass of iron beneficiation tailings, lime and clay,

[0043] Among the chemical components of the iron beneficiation tailings sand, the active component SiO 2 、Al 2 o 3 and Fe 2 o 3 The total content of the iron beneficiation tailings accounts for more than 70% of the ...

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Abstract

The invention discloses a tailing sand two-component soil pavement sub-base layer mixture and a preparation method thereof, which are used for solving the problem of resource utilization of waste tailing sand. Iron ore dressing tailing sand and clay are used as main raw materials, are cured by lime and then are directly used for road sub-base layer filling. A sub-base layer material comprises the following components in percentage by weight: 15-40 percent of iron ore dressing tailing sand, 5-10 percent of lime and 50-80 percent of clay, wherein the sum of all the components is 100 percent. According to optimum water content and maximum dry density of the mixture, a pavement sub-base layer can be obtained through implementation of the conventional lime industrial waste residue stable sub-base layer construction process. According to the mixture and the preparation method thereof, the iron dressing ore tailing sand is applied to a road sub-base layer; a large amount of tailing sand is comprehensively utilized; the land occupied by a tailing pond is reduced; meanwhile, a large amount of sub-base layer filler is substituted; land resource is saved; and the road engineering manufacturing cost is reduced. In addition, the tailing sand-lime-clay mixture is prepared by applying a simple process and is convenient to promote and apply.

Description

technical field [0001] The invention relates to a road subbase material and a preparation method thereof, in particular to a tailings-sand mixed soil pavement subbase mixture and a preparation method thereof, belonging to the technical field of civil engineering materials. Background technique [0002] Tailings are wastes that are discharged after the ore is ground to fineness and selected "useful components" by the concentrator under specific economic and technical conditions, that is, solid waste that has not been fully utilized in ore sorting. In the grinding and sorting process of the ore concentrator, the discharged tailings slurry will be leached with water for a period of time, and the tailings sand accumulation pool will be formed. As an additional product of mining projects, the total amount of tailings in my country is about 8 billion tons, and it is still increasing sharply at a rate of 300 million tons per year; land, and it is easy to induce a variety of geologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/12
CPCY02W30/91
Inventor 石名磊张瑞坤陈迎张浩赵宇
Owner SOUTHEAST UNIV
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