Lithionite slag admixture and its preparation method and use

A technology of lepidolite and admixture, applied in the field of building materials, can solve the problems of low comprehensive utilization rate of lithium slag, storage of lithium slag, pollution of the environment, etc. simple craftsmanship

Inactive Publication Date: 2016-03-30
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of the lithium salt industry, the discharge of lepidolite slag (referred to as lithium slag) is increasing day by day. At present, the comprehensive utilization rate of lithium slag in my country is extremely low, resulting in a large amount of lithium slag stockpiling, wasting resources and polluting the environment.

Method used

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  • Lithionite slag admixture and its preparation method and use
  • Lithionite slag admixture and its preparation method and use
  • Lithionite slag admixture and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The admixture preparation technology of green high-performance concrete prepared by lepidolite slag admixture, the specific method is as follows:

[0027] Select corresponding raw materials to prepare lepidolite slag admixture according to the proportioning shown in table A

[0028] Table A Raw material percentage of admixture (%)

[0029] category

Lepidolite slag (%)

Diatomaceous earth (%)

1

100

0

2

97

3

3

95

5

[0030] Preparation of lepidolite slag: industrial waste slag produced by high-temperature calcination of spodumene to produce lithium carbonate, the raw slag has a large water content and serious agglomeration, and its active SiO 2 The content is greater than 70%. First place it in a 105°C drying oven for 24 hours at low temperature to remove free moisture in the lepidolite slag, then take the above-mentioned low-temperature dried lepidolite slag out of the 105°C drying oven, and lightly dry t...

Embodiment 2

[0034] The preparation method of the green high-performance concrete prepared by lepidolite slag admixture, concrete steps are as follows:

[0035] (1) Raw material preparation

[0036] Cement, select commercially available 42.5 grade ordinary Portland cement that meets the national standard; Lepidolite slag admixture, select the admixture obtained by the admixture preparation process described in Example 1 for use, moisture content is less than 1%, ratio The measured surface area is 400~1000m 2 / Kg, equivalent to replace cement, the replacement rate is 0% to 40% of the mass of the cementitious material; coarse and fine aggregates, choose commercially available ones that meet the standards GB / T14685-2011 "Pebbles and gravels for construction" and GB / T14684- 2011 "Sand for Construction" river sand medium sand, fineness modulus 2.8, mud content 0.5% and continuously graded 5-25mm gravel, mud content 1%, washed and dried for later use; efficient water reduction Agent, polycarbo...

Embodiment 3

[0051] Durability of green high performance concrete prepared with lepidolite slag admixture:

[0052] (1) Utilize the lepidolite slag admixture obtained by three types of proportions to prepare concrete (W / B=0.4), the amount of lepidolite slag admixture in concrete is 20% of the cementitious material quality, and with different The ordinary concrete containing the admixture of the present invention is used as a comparison specimen to measure the chloride ion penetration resistance, and the results are shown in Table 5.

[0053] Table 5 Chloride ion permeability resistance of green high-performance concrete with lepidolite slag admixture

[0054]

[0055] As can be seen from Table 5, the 6h electric flux<1000 coulombs of the concrete that has been mixed with the lepidolite slag admixture is 27% of the 6h electric flux of the concrete without the admixture of the present invention, and has remarkable chloride ion resistance Permeability, significantly improve the durability...

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Abstract

The invention discloses a lithionite slag admixture and its preparation method and use. The lithionite slag admixture is prepared from lithionite slag and diatomite. The preparation method of the lithionite slag admixture comprises drying at a low temperature of 105 DEG C, drying at a high temperature of 300 DEG C and grinding. The mixture of a lot of lithionite slag and concrete is used as a concrete admixture replacing cement and can be used for preparation of C30-C60 eco-friendly high-performance concrete products with different strength. The high-performance concrete product has later compressive strength greatly larger than that of common concrete and has the largest later compressive strength increasing rate of 46.64%. The lithionite slag admixture has substantial acid rain corrosion resistance, has a mass loss late of 51.3% and 34.3% that of the common concrete, has a low concrete compressive strength loss late, has the average compressive strength 1.23 times that of the common concrete, has obvious later acid rain resistance and has neutralization depth of 57.5% that of the common concrete. The lithionite slag concrete has high carbonization resistance and splitting tensile strength and low chloride ion permeability.

Description

technical field [0001] The invention relates to building materials, in particular to a lepidolite slag admixture and a preparation method and application thereof. Background technique [0002] With the rapid development of modern industry, environmental pollution is increasing day by day. The existing building structures are suffering from acid rain, carbon dioxide air pollution, seawater chloride ion erosion and other hazards, which affect the normal use and service life of the structure. Therefore, looking for a high-performance concrete became an urgent issue. High-performance concrete should have high strength and high durability, which can not only meet the mechanical properties of concrete, but also have durability against environmental pollution and erosion. Cement is a must for forming concrete, so it has become a direction to find an environmentally friendly and high-strength cement-based material to replace cement. Lepidolite slag is an industrial waste produced ...

Claims

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Application Information

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IPC IPC(8): C04B18/04C04B14/08
CPCY02W30/91C04B40/0042
Inventor 许开成毕丽苹陈梦成方苇黄财林黄宏聂行阳翌舒
Owner EAST CHINA JIAOTONG UNIVERSITY
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