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A kind of cementitious material and its application

A technology of cementitious materials and raw materials, applied in cement production and other directions, can solve the problems of subsidence of underground goafs, cracking of cemented backfills, etc., and achieve the effects of no reduction in compressive strength, low price, good environmental benefits and economic benefits

Active Publication Date: 2021-04-16
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the existing Portland cement is used as the cementitious material, the sulfate inside the cemented filling body will react with the calcium hydroxide product of cement hydration to generate secondary gypsum and ettringite with expansibility, resulting in cementation The cracking of the filling body and the collapse of the underground goaf, so the existing technology needs further improvement

Method used

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  • A kind of cementitious material and its application
  • A kind of cementitious material and its application
  • A kind of cementitious material and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A cementitious material, made of the following raw materials in parts by weight: 0.1 part of water glass, 0.1 part of carbonate, 1 part of activated magnesium oxide and 81 parts of granulated blast furnace slag powder, the modulus of the water glass is 1.2 , the active magnesium oxide is made of magnesite calcined and ground at 600°C, with a particle size of 10 µm, and the granulated blast furnace slag powder is S105.

[0017] An application of the cementitious material in the cemented filling body of sulfide-containing mine tailings consists of the following steps: mixing the cementitious material, sulfide-containing mine tailings and water evenly, wherein the cementitious material accounts for the total solid mass 3%.

Embodiment 2

[0019] A cementitious material, made of the following raw materials in parts by weight: 1.05 parts of water glass, 1.05 parts of carbonate, 8 parts of active magnesium oxide and 90 parts of granulated blast furnace slag powder, the modulus of the water glass is 1.35 , the active magnesium oxide is calcined and ground at 800°C by magnesite, with a particle size of 45µm, and the granulated blast furnace slag powder is a mixture of S105, S95 and S75.

[0020] An application of the cementitious material in the cemented filling body of sulfide-containing mine tailings consists of the following steps: mixing the cementitious material, sulfide-containing mine tailings and water evenly, wherein the cementitious material accounts for the total solid mass 11.5%.

Embodiment 3

[0022] A cementitious material, made of the following raw materials in parts by weight: 2 parts of water glass, 2 parts of carbonate, 15 parts of active magnesium oxide and 99 parts of granulated blast furnace slag powder, the modulus of the water glass is 1.5 , the active magnesium oxide is made of magnesite calcined and ground at 1000°C, with a particle size of 80µm, and the granulated blast furnace slag powder is S75.

[0023] An application of the cementitious material in the cemented filling body of sulfide-containing mine tailings consists of the following steps: mixing the cementitious material, sulfide-containing mine tailings and water evenly, wherein the cementitious material accounts for the total solid mass 20% of.

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Abstract

The invention belongs to the technical field of mine filling, and in particular relates to a cementitious material used for a cemented filling body of mine tailings containing sulfide. The cementitious material is made of the following raw materials in parts by weight: 0.1-2 parts of water glass, 0.1-2 parts of carbonate, 1-15 parts of activated magnesium oxide and 81-99 parts of granulated blast furnace slag powder. The filling body cemented by the cementitious material and the sulfide mine tailings will not crack, the compressive strength will not decrease in the later stage, and the economic benefit is good.

Description

technical field [0001] The invention belongs to the technical field of mine filling, and in particular relates to a cementitious material and its application. Background technique [0002] Mineral resources are an important material basis for the survival and development of human beings, and one of the decisive factors for the prosperity of a country. In my country, the mining industry is the basic industry for the development of the national economy. Over the past 40 years of reform and opening up, the massive development and utilization of mineral resources has supported the sustained and rapid development of the national economy, but it has also brought huge environmental pressure. For example, the accumulation of waste tailings will occupy a large land, causing land poisoning and acidification; and now mines often adopt filling mining technology, which uses waste tailings as aggregate, adds a certain amount of cementitious material and water to prepare slurry, fills it in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/153C04B28/26
CPCC04B7/153C04B28/26C04B2111/00724C04B2111/00784C04B2201/50C04B18/141C04B2/00C04B22/10C04B18/12Y02P40/10
Inventor 郑娟荣朱亚兰张四密元成方
Owner ZHENGZHOU UNIV
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