Gypsum tailing mine gelled material and preparation process thereof

A cementitious material and gypsum technology, applied in the field of building materials, can solve the problems of frosting, crystal structure damage, and poor structural stability of hardened bodies, etc., and achieve the effects of simple production process, moderate setting time, and low production cost

Inactive Publication Date: 2006-06-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor water resistance of the product and the phenomenon of frosting, it has not entered the stage of practical application.
Through research, the reasons are preliminarily analyzed: (1) The calcination temperature is too high, which makes the initial water-filled space of the mineralized body too small, resulting in poor structural stability of the hardened body; destroy, make Na + 、K + The ions are activated and easily react with SO 4 2- Glauber's salt
Therefore, the test of preparing cementitious materials from calcined gypsum tailings failed.

Method used

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  • Gypsum tailing mine gelled material and preparation process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 Shown, the preparation method of gypsum tailings cementitious material, it comprises the following steps: 1). The preparation of gypsum tailings powder: the gypsum tailings is crushed to a particle size of less than 10mm, then ground to 0.08mm square hole sieve 15% fine powder for later use; 2). Preparation of slag powder: drying and grinding the water-quenched slag discharged from iron and steel enterprises until the specific surface area is 4001-8000cm 2 / g standby; 3). With the mass ratio of 60% gypsum tailings powder, mass ratio of 30% ground slag powder, mass ratio of 10% dry base fly ash; externally mixed with the gypsum tailings powder 1% activator (quicklime) and 1.5% early strength agent (finely ground alum stone powder) of 1% slag powder and fly ash quality are mixed evenly with a mixer, and the package can leave the factory. When in use, it can be used by mixing according to the water-cement ratio of 0.2-0.3 or mixing 20%-30% of the aggregat...

Embodiment 2

[0027] The preparation method of gypsum tailings cementitious material comprises the following steps: 1). The preparation of gypsum tailings powder: the gypsum tailings are crushed to a particle size of less than 10mm, and then ground to a 0.08mm square hole sieve with a sieve residue of 15 % fine powder for subsequent use; 2). Preparation of slag powder: drying and grinding the water-quenched slag until the specific surface area is greater than 4000cm 2 / g standby; 3). With the mass ratio of 70% gypsum tailings powder, mass ratio of 20% finely ground slag powder, mass ratio of 10% dry base fly ash, externally mixed with the gypsum tailings powder 0.8% activator (quick lime) and 1.3% early strength agent (calcined alunite, ground into powder) of 0.8% slag powder and fly ash quality are mixed evenly with a mixer, and the package can leave the factory. When in use, it can be used by mixing according to the water-cement ratio of 0.2-0.3 or mixing 20%-30% of the aggregate of the p...

Embodiment 3

[0029] A preparation method for gypsum tailings cementitious material, which comprises the following steps: 1). Preparation of gypsum tailings powder: crushing gypsum tailings to a particle size of less than 10mm, and then grinding to a 0.08mm square hole sieve with a sieve residue of 15 % fine powder for subsequent use; 2). Preparation of slag powder: drying and grinding the phosphorus slag until the specific surface area is greater than 4000cm 2 / g for standby; 3). The mass ratio is 60% gypsum tailings powder, the mass ratio is 30% ground slag powder, and the mass ratio is 10% dry base fly ash, and the gypsum tailings powder is mixed with the 1.2% activator (slaked lime) and 1.7% early strength agent (alum powder) of 1.2% slag powder and fly ash quality are mixed evenly with a mixer, and the packaging can leave the factory. When in use, it can be used by mixing according to the water-cement ratio of 0.2-0.3 or mixing 20%-30% of the aggregate of the product quality of the pre...

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Abstract

A water-hardening cementing material is proportionally prepared from the gypsum ore tailings, the slag powder prepared from water-quenched slag and P slag through baking and grinding, powdered coal ash, trigger and early-strengthening agent through mixing.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a hydraulic gelling material and a preparation method thereof. technical background [0002] Gypsum tailings refer to gypsum ore with a dihydrate gypsum content of less than 50%. Because it contains various impurities, it cannot be used for calcined plaster and becomes an industrial waste. At present, there are a large number of gypsum mines in major gypsum mines, which not only occupy land, affect production, but also pollute the environment. Therefore, the recycling of gypsum tailings has attracted people's attention. [0003] In the early 1980s, Yingcheng Gypsum Mine in Hubei Province conducted research on the recycling of gypsum tailings. The preparation method is as follows: the gypsum tailings are calcined at a high temperature (over 800° C.) to convert the dihydrate gypsum into anhydrous gypsum, and then add cement and other additives. However, du...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/08C04B18/12C04B18/14C04B111/72
CPCY02W30/91
Inventor 姜洪义张惠玲彭长棋
Owner WUHAN UNIV OF TECH
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