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Geopolymer-stabilized phosphate tailing pavement base layer and preparation method thereof

A technology of pavement base and phosphorus tailings, applied in the direction of roads, roads, solid waste management, etc., can solve problems such as resource consumption, non-conformity with green and low-carbon development concepts, and carbon dioxide emissions

Pending Publication Date: 2021-10-26
GUIZHOU CHANHEN CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ordinary Portland cement and lime will cause resource consumption and carbon dioxide emissions during the production process, which is not in line with the current green and low-carbon development concept

Method used

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  • Geopolymer-stabilized phosphate tailing pavement base layer and preparation method thereof
  • Geopolymer-stabilized phosphate tailing pavement base layer and preparation method thereof
  • Geopolymer-stabilized phosphate tailing pavement base layer and preparation method thereof

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preparation example Construction

[0038] The application also provides a preparation method for geopolymer-stabilized phosphorus tailings pavement base, comprising the following steps:

[0039] Mix one or two of phosphorus slag powder and fly ash, calcium carbide slag and phosphorus tailings according to the ratio of raw materials, and then add water to obtain a mixture;

[0040] The mixture is paved, rolled and formed and maintained in sequence to obtain a geopolymer-stabilized phosphorus tailings pavement base.

[0041] More specifically, the preparation method of the geopolymer-stabilized phosphorus tailings pavement base is as follows:

[0042] 1) Mixing of raw materials: mix the calcium carbide slag, phosphorus slag powder, fly ash and phosphorus tailings measured by the ratio composition evenly by factory mixing method, add water, and adjust the water content during the mixing process to make the mixture The water content is 0.5-1% of the optimal water content, and the water content is tested every 2 ho...

Embodiment 1

[0057] Calcium carbide slag-phosphorus slag powder base polymer stabilized phosphorus tailings pavement base: Carbide carbide slag, phosphorus slag powder, and phosphorus tailings are weighed according to the design components in Table 2, according to the "Highway Engineering Inorganic Binder Stable Material Test Regulations" (JTG E51-2009) carry out the compaction test to determine the optimum moisture content and maximum dry density of the mixture, form the test piece according to the controlled compaction degree and measure its unconfined compressive strength. Phosphorus tailings are taken from the tailings warehouse of Guizhou Chuanheng Chemical Co., Ltd., and the specific surface area of ​​carbide slag is ≥300m 2 / kg, phosphorus slag powder specific surface area ≥ 400m 2 / kg, changing the mass ratio of calcium carbide slag and phosphorus slag powder, and carrying out the unconfined compressive strength test according to the compaction degree of 95%. .

[0058] From the ...

Embodiment 2

[0060] Calcium carbide slag-phosphorus slag powder-fly ash geopolymer stabilized phosphorus tailings pavement base: Carbide carbide slag, phosphorus slag powder, and phosphorus tailings were weighed according to the design components in Table 3, according to "Highway Engineering Inorganic Binder Stabilization According to the "Material Test Regulations" (JTG E51-2009), the compaction test is carried out to determine the optimum moisture content and maximum dry density of the mixture, and the test pieces are formed according to the controlled compaction degree and their unconfined compressive strength is measured. Phosphorus tailings are taken from the tailings warehouse of Guizhou Chuanheng Chemical Co., Ltd., and the specific surface area of ​​carbide slag is ≥300m 2 / kg, phosphorus slag powder specific surface area ≥ 400m 2 / kg, fly ash specific surface area ≥ 750m 2 / kg, adjust the amount of phosphorus slag powder and fly ash, and carry out the unconfined compressive stren...

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Abstract

The invention provides a geopolymer-stabilized phosphate tailing pavement base layer. The geopolymer-stabilized phosphate tailing pavement base layer is prepared from 6-20 wt% of calcium carbide slag, 15-24 wt% of one or two of phosphorus slag powder and fly ash, and 60-70 wt% of phosphate tailings. The invention further provides a preparation method of the geopolymer-stabilized phosphate tailing pavement base layer. According to the pavement base layer, an alkaline environment is formed through dissolution and ionization of the main component Ca(OH)2 of the calcium carbide slag, conditions are provided for fracture of silicon-oxygen bonds in the phosphorus slag powder or the fly ash, geopolymer gel such as hydrated calcium silicate (C-S-H) and hydrated calcium aluminate (C-A-H) is generated through recombination, the geopolymer gel is cemented between phosphorus tailing particles, and then curing and mutual interlocking are carried out to form a rigid matrix with mechanical strength, and the mechanical property and durability of the pavement base layer are built. According to the invention, solid waste is recycled, the use of the curing agent is reduced, the engineering cost is reduced, the construction is simple, and the environmental harm is small.

Description

technical field [0001] The invention relates to the technical field of industrial solid waste reuse, in particular to a geopolymer-stabilized phosphorus tailings pavement base and a preparation method thereof. Background technique [0002] With the sustained and rapid growth of my country's economy, an increasing amount of solid waste is discharged in the process of industrial development, such as calcium carbide slag discharged after hydrolysis of calcium carbide to produce acetylene, fly ash discharged from thermal power plants, and phosphorus tails generated by flotation of phosphate rock. Most of the phosphorus slag discharged from mines and yellow phosphorus plants are mainly in the form of piles. However, there are a series of environmental pollution and safety problems in the stacking of solid waste, including soil degradation, leaching of harmful organic matter, heavy metals, destruction of vegetation, dam failure of the stacking silo, and so on. Therefore, it is of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00E01C3/00C04B18/12
CPCC04B28/006E01C3/003C04B2111/0075C04B2201/50C04B22/064C04B18/145C04B18/08C04B18/12Y02W30/91Y02P40/10
Inventor 李剑秋刘族东张庆刚温元波王佳才赵青林周尚群
Owner GUIZHOU CHANHEN CHEM CO LTD
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