Expansion backfill prepared from salt gypsum as raw material and preparation method of expansion backfill

A salt gypsum and backfilling technology, which is applied in the field of expansion backfilling and its preparation, can solve the problems of low compressive strength and achieve high compressive strength, reduce surface subsidence, and good sealing performance

Inactive Publication Date: 2019-03-08
湖南昌迅科技环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This filling technology also has problems such as low compressive strength

Method used

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  • Expansion backfill prepared from salt gypsum as raw material and preparation method of expansion backfill
  • Expansion backfill prepared from salt gypsum as raw material and preparation method of expansion backfill
  • Expansion backfill prepared from salt gypsum as raw material and preparation method of expansion backfill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] An expansion backfill prepared from salt gypsum, comprising the following components in parts by weight:

[0046] 100 parts of salt gypsum, 6 parts of activator, 0.1 part of foaming agent, 40 parts of water;

[0047] Wherein the water content of salt gypsum is 21%, and its fineness is 200 mesh standard sieve balance <1.7%;

[0048] The activator is potassium aluminum sulfate;

[0049] The blowing agent is sodium α-alkenyl sulfonate.

[0050] In this embodiment, the preparation method for preparing the expansion back filler with salt gypsum as raw material comprises the following steps:

[0051] Step S1: mixing the salt gypsum and the activator in proportion to transform the salt gypsum from anhydrite to dihydrate gypsum;

[0052] Step S2: Add foaming agent and water in proportion, and mix the materials evenly to prepare expanded back filler.

Embodiment 2

[0054] An expansion backfill prepared from salt gypsum, comprising the following components in parts by weight:

[0055] 100 parts of salt gypsum, 2 parts of activator, 0.3 part of foaming agent, 30 parts of water;

[0056] Wherein the water content of salt gypsum is 30%, and its fineness is 200 mesh standard sieve balance <1.7%;

[0057] The activator is a mixture of aluminum potassium sulfate and sodium sulfate, and the two are mixed according to 1:1;

[0058] The foaming agent is a mixture of sodium lauryl sulfate and fatty alcohol polyoxyethylene ether sodium sulfate.

[0059]In this embodiment, the preparation method of the expanded back filler is the same as that of Embodiment 1, and will not be repeated here.

Embodiment 3

[0061] An expansion backfill prepared from salt gypsum, comprising the following components in parts by weight:

[0062] 100 parts of salt gypsum, 4 parts of activator, 0.2 part of foaming agent, 50 parts of water;

[0063] Wherein the water content of salt gypsum is 20%, and its fineness is 200 mesh standard sieve balance <1.7%;

[0064] The activator is a mixture of sodium sulfate and potassium sulfate, and the two are mixed according to 2:1;

[0065] The blowing agent is sodium lauryl sulfate.

[0066] In this embodiment, the preparation method of the expanded back filler is the same as that of Embodiment 1, and will not be repeated here.

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Abstract

The invention discloses an expansion backfill prepared from salt gypsum as a raw material. The expansion backfill prepared from the salt gypsum as the raw material comprises the following components:salt gypsum, an excitant, a foaming gent and water. The salt gypsum is transformed into dihydrate gypsum by the excitant, and the addition amount of the excitant is 2-12% of the weight of the salt gypsum; the addition amount of the foaming agent is 0.1-0.8% of the weight of the salt gypsum; and the addition amount of the water is 30-60% of the weight of the salt gypsum. The expansion backfill prepared from the salt gypsum as the raw material provided by the invention has the characteristics of being high in compressive strength, high in bonding strength, stable in size and the like, and phenomena such as sink and deformation are avoided after backfill; and meanwhile, the salt gypsum serves as the base material, high value-added comprehensive utilization of the salt gypsum is realized, theproblem that the land is destroyed when soil is extracted is solved, and the ecological environment is protected. Based on the expansion backfill, the invention further provides a preparation method of the expansion backfill prepared from the salt gypsum as the raw material.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an expansion back filler prepared from salt gypsum as a raw material and a preparation method thereof. Background technique [0002] With the development of the mining industry, especially the rapid development of energy mining powered by coal, coal mines are spread all over the place. However, the hazards caused by coal mining are also increasing day by day, mainly including ground subsidence caused by coal mining goaf, accumulation of coal drilling stones and ecological damage. If the coal mine goaf has not undergone reasonable follow-up treatment, the ground subsidence caused by it will have a particularly serious impact on the environment. [0003] The earliest filling method for goaf management in mines at home and abroad is dry filling. Dry filling is to transport the collected dry filling materials such as rocks, sand, soil, industrial waste residues, etc. to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B38/10C04B111/70C04B111/40
CPCC04B28/142C04B38/10C04B2111/40C04B2111/70C04B2201/50C04B22/142C04B24/16C04B22/147C04B24/166
Inventor 蔡雪飞王文忠杨雪林奕文吴阳
Owner 湖南昌迅科技环保股份有限公司
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