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Method for preparing aerated concrete from gangue and iron tailings

A technology of aerated concrete and coal gangue, which is applied in the field of comprehensive utilization of mine resources and building materials, and can solve the problems of comprehensive utilization rate less than 10%, limited quantity, waste of resources, etc.

Inactive Publication Date: 2015-09-02
HEBEI UNIV OF ENG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If these tailings resources are not utilized, it will cause a huge waste of resources
While all countries in the world pay attention to secondary resource tailings, most of the tailings in my country have not been comprehensively utilized, especially the comprehensive utilization rate of non-ferrous metal tailings and iron tailings is lower, and the comprehensive utilization rate is less than 10%.
However, the use of solid waste to produce aerated concrete is limited at home and abroad, and there are no reports of using coal gangue and iron tailings as siliceous raw materials, and calcium carbide slag as calcareous raw materials to produce aerated concrete

Method used

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  • Method for preparing aerated concrete from gangue and iron tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Use a jaw crusher to crush the raw coal gangue without spontaneous combustion to -2mm and then dry it, then mix 30% coal gangue with 32% iron tailings, 28% calcium carbide slag, and 5% desulfurized gypsum (above The amount of four kinds of raw materials is the mass percent after calcining) mixed, and the mixed material after mixing is ground to the specific surface area of ​​330m 2 / kg.

[0018] 2. Calcinate the mixture obtained in step 1 at 760° C. for 2 hours, and cool the calcined mixture naturally.

[0019] 3. After using the natural cooling powder in step 2, add cement at 1:0.05 and mix evenly, add warm water and 0.257‰ foam stabilizer according to 58% of the total dry material, stir for 100s, and then add 0.54‰ of the total dry material The aluminum powder paste was stirred for another 40 seconds to obtain a uniformly mixed slurry. During the mixing process, heat preservation measures were set to ensure that the temperature of the mold entering the slurry was ...

Embodiment 2

[0025]1. Use a jaw crusher to crush the raw coal gangue without spontaneous combustion to -2mm and then dry it, then mix 26% coal gangue with 36% iron tailings, 25% calcium carbide slag, and 7% desulfurized gypsum (above The amount of the four raw materials is the mass percentage after calcination) mixed, and the mixed material is ground to a specific surface area of ​​350m 2 / kg.

[0026] 2. Calcinate the mixture obtained in step 1 at 810° C. for 2.5 hours, and cool the calcined mixture naturally.

[0027] 3. After using the natural cooling powder in step 2, add cement at 1:0.06 and mix evenly, then add warm water and 0.258‰ foam stabilizer according to 59% of the total dry material, stir for 120s, and then add 0.56‰ of the total dry material The aluminum powder paste was stirred for another 50 seconds to obtain a uniformly mixed slurry. During the mixing process, heat preservation measures were set to ensure that the mold entry temperature of the slurry was at 47°C.

[002...

Embodiment 3

[0033] 1. Use a jaw crusher to crush the raw coal gangue without spontaneous combustion to -2mm and then dry it, then mix 24% coal gangue with 38% iron tailings, 27% calcium carbide slag, and 7% desulfurized gypsum (above The amount of four kinds of raw materials is the mass percentage after calcining) mixed, and the mixed material after mixing is ground to the specific surface area of ​​375m 2 / kg.

[0034] 2. Calcinate the mixture obtained in step 1 at 800° C. for 3 hours, and cool the calcined mixture naturally.

[0035] 3. After using the natural cooling powder in step 2, add cement at 1:0.04 and mix evenly, add warm water and 0.259‰ foam stabilizer according to 60% of the total dry material, stir for 130s, and then add 0.58‰ of the total dry material The aluminum powder paste was stirred for another 35 seconds to obtain a uniformly mixed slurry. During the stirring process, thermal insulation measures were set to ensure that the temperature of the mold when the slurry wa...

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Abstract

The invention discloses a method for preparing aerated concrete from gangue and iron tailings. The method comprises the following steps of crushing non-hypergolic raw gangue to obtain particles of -2mm, carrying out drying, mixing 20-30% by mass of the gangue, 30-45% by mass of iron tailings, 22-30% by mass of carbide slag and 3-8% by mass of flue gas desulfurization gypsum to obtain a uniform mixture, wherein the above four raw materials are mixed according to mass percents after calcination, milling the mixture to powder with a specific surface area of 310-400m<2> / kg, calcining the powder at a temperature of 750-850 DEG C for 2-3h, naturally cooling the powder, adding the cooled powder into cement according to a ratio of 1: 0.03-0.07, and based on the total weight of the dry material, adding 0.05-0.06% of aluminum powder paste, 57-62% of warm water and 0.025-0.026% of a foam stabilizer into the mixture. Through pouring, standing maintenance, blank cutting and autoclaved curing, the aerated concrete accepted product with oven dry compressive strength of 3.5MPa or more and oven dry volume density of 550-625kg / m<3> is obtained.

Description

technical field [0001] The invention relates to a method for preparing air-entrained concrete with coal gangue and iron tailings which have not been spontaneously combusted as main raw materials. It is a preparation technology that can produce aerated concrete by utilizing solid waste coal gangue, iron tailings, carbide slag and desulfurized gypsum in a large proportion. The invention belongs to the fields of comprehensive utilization of mine resources and building materials. Background technique [0002] In the past few decades, my country's industry has developed rapidly, so a lot of industrial hazardous solid wastes such as coal gangue and iron tailings have been produced. [0003] Coal gangue is rock solid waste that is removed from raw coal in the process of capital construction and raw coal production and washing in coal mines. It is one of the bulk industrial solid wastes discharged in my country at present. The annual discharge of coal gangue in my country accounts...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B28/00C04B7/24C04B7/36
CPCY02P40/10Y02P40/121
Inventor 王长龙仇夏杰郑永超崔孝炜王传龙王爽狄燕清李丽刘世昌杨建
Owner HEBEI UNIV OF ENG
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