Mine filler based on calcination-free gypsum and preparation method ofmine filler

A calcination-free, filler-free technology, applied in the field of mining engineering, can solve the problems of resource waste, environmental pollution, occupation of land, etc., and achieve the effects of small strength loss, strong water resistance, and fast setting and hardening speed.

Pending Publication Date: 2021-11-05
熊清平 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, desulfurized gypsum is mainly used as a retarder in the production of gypsum products and ordinary cement, but there are still a large amount of gypsum piled up in specific storage yards, which not only occupies land, causes environmental pollution, but also is a huge waste of resources. Therefore, the development of desulfurized gypsum resources There are obvious social, economic and ecological benefits of filling mine pits with the most efficient use of technology

Method used

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  • Mine filler based on calcination-free gypsum and preparation method ofmine filler
  • Mine filler based on calcination-free gypsum and preparation method ofmine filler
  • Mine filler based on calcination-free gypsum and preparation method ofmine filler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Each component and weight percentage thereof are in the present embodiment:

[0031]

[0032] The non-calcined phosphogypsum, magnesium oxide, magnesium sulfate, citric acid, sodium tripolyphosphate and methyl cellulose ether in the above components are prepared according to the aforementioned process to obtain filler powder. Add tap water of 40wt% of powder mass, stir for 3 minutes, obtain flowable slurry. Its initial fluidity reaches 330mm, and it reaches final setting in 220min. Its 7d strength is 13.5MPa, 14d strength is 17.5MPa, 28d strength is 21.5MPa, and the softening coefficient is 0.75.

Embodiment 2

[0034] Each component and weight percentage thereof are in the present embodiment:

[0035]

[0036]

[0037] The non-calcined phosphogypsum, magnesium oxide, magnesium sulfate, citric acid, sodium tripolyphosphate and methyl cellulose ether in the above components are prepared according to the aforementioned process to obtain the grouting material powder. Add tap water of 35wt% of powder mass, stir for 3 minutes, obtain flowable slurry. Its initial fluidity reaches 310mm, and it reaches final setting in 210 minutes. Its 7d strength is 11.0MPa, 14d strength is 14.5MPa, 28d strength is 21.5MPa, and the softening coefficient is 0.80.

Embodiment 3

[0039] Each component and weight percentage thereof are in the present embodiment:

[0040]

[0041] The non-calcined phosphogypsum, magnesium oxide, magnesium sulfate, citric acid, sodium tripolyphosphate and methyl cellulose ether in the above components are prepared according to the aforementioned process to obtain the grouting material powder. Add tap water of 38wt% of powder mass, stir for 2.5 minutes, obtain flowable slurry. Its initial fluidity reaches 310mm, the final setting time is 150min, and its 7d strength is 12.0MPa, 14d strength is 16.5MPa, 28d strength is 22.5MPa, and the softening coefficient is 0.83.

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Abstract

The invention discloses a mine filler based on calcination-free gypsum and a preparation method of the mine filler. The mine filler comprises the following components in percentage by weight: 75-81% of non-calcined desulfurized gypsum / ardealite, 12-16% of magnesium oxide, 3-6% of magnesium sulfate, 1.2-1.9% of citric acid, 0.48-1.75% of sodium tripolyphosphate and 0.02-0.05% of a water-retaining agent. The mine filler can be directly used for mine filling and pouring, and has the characteristics of high fluidity, good working performance, acid and erosion resistance, high later strength, high ardealite consumption and the like.

Description

technical field [0001] The invention relates to the field of mining engineering, in particular to a mine filling material based on non-calcined gypsum and a preparation method thereof. Background technique [0002] With the demand for ecological restoration and development, the governance of mine goafs has attracted much attention. Traditionally, dry filling is used, and some rocks, sand, soil, and industrial waste are thrown to the area to be filled by manpower or machinery to form a compressible loose filling body. However, this filling method has many defects, such as poor sealing, prone to surface subsidence, movement, deformation, etc. In addition, the demand for backfilling sand and gravel and soil is large, and it is not suitable to obtain it. In recent years, some new filling technologies have emerged, such as compounding some tailings with cement and other cementitious materials to prepare filling materials. For example, patent application publication number: CN11...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/30C04B111/70
CPCC04B28/30C04B2111/70C04B2201/50C04B2111/00724C04B18/0445C04B22/16C04B24/06C04B24/383
Inventor 熊清平熊晨
Owner 熊清平
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