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A method for preparing foam concrete from iron tailings and aerated concrete waste

A technology of aerated concrete and foamed concrete, applied in the field of building materials, can solve problems such as environmental threats, occupation of land resources, etc., and achieve the effects of good sound insulation, simple process flow, and easy method.

Active Publication Date: 2022-02-08
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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  • A method for preparing foam concrete from iron tailings and aerated concrete waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Step 1: Use a jaw crusher to crush the gangue to 2 / kg, and then the pulverized material was calcined at 1000°C to obtain the coal gangue base material.

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

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

[0064] Step 3, drying and grinding the iron tailings until the specific surface area is 550m 2 / kg; dry the phosphogypsum and grind it to a specific surface area of ​​300m 2 / kg; dry the cement clinker and grind it until the specific surface area is 700m 2 / kg; the above-mentioned pretreated material is mixed with coal gangue base material and aerated concrete waste base material to obtain a dry material mixture;

[0065] Wherein, the drying temperature is 45°C, and the drying is performed until the moisture ...

Embodiment 2

[0077] Step 1, use jaw crusher to crush coal gangue to 2 / kg, and then the pulverized material was calcined at 1000°C to obtain the coal gangue base material.

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

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

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

[0081] Wherein, the drying temperature is 50°C, and the drying is performed until the moisture c...

Embodiment 3

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

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

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

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

[0097] Wherein, the drying temperature is 50°C, and the drying is performed until the moisture content is...

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Abstract

The invention belongs to the technical field of building materials, and relates to a method for preparing foamed concrete from iron tailings and aerated concrete waste, including: step 1, crushing and grinding coal gangue, and then calcining the ground material to obtain Coal gangue base material; step 2, crush the aerated concrete waste to <2mm, then dry and grind it into fine material to obtain the aerated concrete waste base material; step 3, mix iron tailings, phosphogypsum and cement clinker Carrying out pretreatment, mixing the pretreated material with coal gangue base material and aerated concrete waste base material to obtain a dry material mixture; step 4, adding warm water to the dry material mixture, stirring evenly, and then adding hydrogen peroxide , stirring evenly to obtain a mixed slurry; Step 5, pouring the mixed slurry, gas forming, and then taking out the gas-molded green body for cutting, and then performing standard maintenance to obtain foam concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing foam concrete with iron tailings and aerated concrete waste. Background technique [0002] In recent years, the development of my country's mineral resources has continued to grow, and industrial development has made unprecedented progress. However, a large amount of industrial solid waste has followed, such as iron tailings, aerated concrete waste, and phosphogypsum. [0003] Iron tailings refer to solid wastes with low content of useful components produced in the beneficiation process of iron mines, which are not suitable for further separation under the current technical and economic conditions. 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 preci...

Claims

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Application Information

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Patent Type & Authority Patents(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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