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Method for preparing foam concrete from iron tailings and aerated concrete wastes

A technology of air-entrained concrete and foam concrete, which is applied in the field of building materials, can solve problems such as environmental threats and occupation of land resources, and achieve good sound insulation, simple process flow, and good thermal insulation

Active Publication Date: 2020-04-21
HEBEI UNIV OF ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2018, the amount of iron tailings produced in my country was about 720 million tons, while the comprehensive utilization rate of iron tailings was only about 20%. The stockpiling of a large number of iron tailings not only occupied precious land resources, but also caused huge damage to the environment. threaten

Method used

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  • Method for preparing foam concrete from iron tailings and aerated concrete wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Step 1. Use jaw crusher to crush coal gangue to 2 / kg, then the ground material is calcined at 1000°C to obtain coal gangue base material.

[0062] Step 2: Use a jaw crusher to crush the aerated concrete waste to 2 / kg, to obtain aerated concrete waste base material.

[0063] Wherein, the drying temperature of the aerated concrete waste is 45° C., and the water content is less than 0.1%; the grinding machine is a SMΦ500mm×500mm cement mill.

[0064] Step 3: Dry the iron tailings and grind them to a specific surface area of ​​550m 2 / kg; After drying the phosphogypsum, it is ground to a specific surface area of ​​300m 2 / kg; dry the cement clinker and grind it to a specific surface area of ​​700m 2 / kg; Mix the above-mentioned pretreated materials with coal gangue base material and aerated concrete waste base material to obtain a dry mix;

[0065] Wherein, the drying temperature is 45°C, and drying to a moisture content of less than 0.1%; the grinding machine is a SMΦ500mm×500mm ...

Embodiment 2

[0077] Step 1. Use jaw crusher to crush coal gangue to 2 / kg, then the ground material is calcined at 1000°C to obtain coal gangue base material.

[0078] Step 2: Use a jaw crusher to crush the aerated concrete waste to 2 / kg, to obtain aerated concrete waste base material.

[0079] Wherein, the drying temperature of the aerated concrete waste is 50° C., and the water content is less than 0.1%; the grinding machine is a cement mill of SMΦ500mm×500mm.

[0080] Step 3: Dry the iron tailings and grind to a specific surface area of ​​600m 2 / kg; After drying the phosphogypsum, it is ground to a specific surface area of ​​350m 2 / kg; dry the cement clinker and grind it to a specific surface area of ​​650m 2 / kg; Mix the above-mentioned pretreated material with coal gangue base material and aerated concrete waste base material to obtain a dry mix;

[0081] Wherein, the drying temperature is 50°C, and the moisture content is less than 0.1%; the grinding machine is a SMΦ500mm×500mm cement mill...

Embodiment 3

[0093] Step 1. Use jaw crusher to crush coal gangue to 2 / kg, then the ground material is calcined at 900°C to obtain coal gangue base material.

[0094] Step 2: Use a jaw crusher to crush the aerated concrete waste to 2 / kg, to obtain aerated concrete waste base material.

[0095] Wherein, the drying temperature of the aerated concrete waste is 50° C., and the water content is less than 0.1%; the grinding machine is a cement mill of SMΦ500mm×500mm.

[0096] Step 3: Dry the iron tailings and grind them to a specific surface area of ​​800m 2 / kg; After drying the phosphogypsum, it is ground to a specific surface area of ​​400m 2 / kg; dry the cement clinker and grind it to a specific surface area of ​​600m 2 / kg; Mix the above-mentioned pretreated material with coal gangue base material and aerated concrete waste base material to obtain a dry mix;

[0097] Wherein, the drying temperature is 50°C, and the moisture content is less than 0.1%; the grinding machine is a SMΦ500mm×500mm cement ...

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Abstract

The invention belongs to the technical field of building materials, and relates to a method for preparing foam concrete from iron tailings and aerated concrete waste. The method comprises the following steps: 1, crushing and grinding coal gangue, and calcining the ground material to obtain a coal gangue base material; 2, crushing aerated concrete wastes to be smaller than 2 mm, and drying and grinding into fine materials to obtain an aerated concrete waste base material; 3, pretreating the iron tailings, phosphogypsum and cement clinker, and mixing the pretreated material with the coal ganguebase material and the aerated concrete waste base material to obtain a dry material mixture; 4, adding warm water into the dry material mixture, uniformly stirring, then adding hydrogen peroxide, anduniformly stirring to obtain a mixed slurry; and 5, pouring the mixed slurry, carrying out gas generation forming, then taking out and cutting a blank obtained after gas generation forming, and then performing standard maintenance to obtain the foam concrete.

Description

Technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a method for preparing foamed concrete from iron tailings and aerated concrete waste. Background technique [0002] In recent years, the development of mineral resources in our country has continued to grow, and industrial development has made unprecedented progress. However, a large number of industrial solid wastes have been produced, such as iron tailings, aerated concrete waste, and phosphogypsum. [0003] Iron tailings refer to solid wastes that have a low content of useful components produced in the process of iron ore beneficiation and are not suitable for further separation under current technical and economic conditions. In 2018, the amount of iron tailings produced in my country was about 720 million tons, and the comprehensive utilization rate of iron tailings was only about 20%. The accumulation of a large amount of iron tailings not only occupied valua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B38/02C04B38/08C04B111/40C04B111/52
CPCC04B28/02C04B2201/20C04B2201/50C04B2111/40C04B2111/52C04B18/16C04B18/12C04B22/068C04B22/144C04B7/00C04B38/02C04B38/08
Inventor 王长龙叶鹏飞张凯帆霍泽坤任真真赵高飞
Owner HEBEI UNIV OF ENG
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