A kind of red mud-based sintered lightweight aggregate and preparation method thereof

A light aggregate and red mud technology, which is applied in the field of red mud-based sintered light aggregate and its preparation, can solve the problems of high cost of valuable metals, efflorescence in the production of sintered bricks, secondary pollution, etc., and achieve the suppression of radioactivity and the preparation process Simple, cost-reducing effect

Active Publication Date: 2017-10-03
江西林宇建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the research on the comprehensive utilization of red mud mainly focuses on the extraction of valuable metals, the use of environmental restoration materials, engineering plastic fillers, and the production of sintered bricks. Restoration will cause secondary pollution, pan-alkali phenomenon in the production of fired bricks, etc.

Method used

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  • A kind of red mud-based sintered lightweight aggregate and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0017] A red mud-based sintered light aggregate, which is composed of the following raw materials: weigh 40 parts of red mud, 30 parts of fly ash, 20 parts of coal gangue, and 10 parts of silica fume by weight on a dry basis; sodium lauryl sulfate 10 parts, 30 parts of sodium nitrate, 60 parts of pulverized coal of fineness 500 orders, 20 parts of granulated binder, wherein, granulated binder is the mixed solution of water and water glass, and its mass ratio is 75: 25, and wherein, water The glass modulus is 2.0~3.2.

[0018] The preparation method of the above-mentioned red mud-based sintered light aggregate comprises the following steps:

[0019] (1) Raw material treatment: Weigh red mud, fly ash, coal gangue and silica fume in parts by weight on a dry basis, and mix them evenly in a mixer;

[0020] (2) Preparation of composite performance modifier: Weigh sodium lauryl sulfate, sodium nitrate, coal powder with a fineness of 500 mesh, mix well, and then stand at 50°C for 2 d...

Embodiment 2

[0025] A red mud-based sintered light aggregate, which is composed of the following raw materials: weigh 60 parts of red mud, 20 parts of fly ash, 15 parts of coal gangue, and 5 parts of silica fume by weight on a dry basis; sodium lauryl sulfate 20 parts, potassium nitrate 20 parts, fineness 500 mesh pulverized coal 55 parts, granulated binder 10 parts, wherein, granulated binder is the mixed solution of water and water glass, and its mass ratio is 85: 15, and wherein, water The glass modulus is 2.0~3.2.

[0026] The preparation method of the above-mentioned red mud-based sintered light aggregate comprises the following steps:

[0027] (1) Raw material treatment: Weigh red mud, fly ash, coal gangue and silica fume in parts by weight on a dry basis, and mix them evenly in a mixer;

[0028] (2) Preparation of composite performance regulator: weigh sodium lauryl sulfate, potassium nitrate, and coal powder with a fineness of 500 mesh, mix well, and then stand at 65°C for 2 days;...

Embodiment 3

[0033] A red mud-based sintered light aggregate, which is composed of the following raw materials: weigh 80 parts of red mud, 10 parts of fly ash, 5 parts of coal gangue, and 5 parts of silica fume by weight on a dry basis; sodium lauryl sulfate 20 parts, 5 parts of sodium nitrate, 30 parts of fineness 500 mesh pulverized coal, 30 parts of granulated binder, wherein, granulated binder is the mixed solution of water and water glass, and its mass ratio is 90: 10, and wherein, water The glass modulus is 2.0~3.2.

[0034] The preparation method of the above-mentioned red mud-based sintered light aggregate comprises the following steps:

[0035] (1) Raw material treatment: Weigh red mud, fly ash, coal gangue and silica fume in parts by weight on a dry basis, and mix them evenly in a mixer;

[0036] (2) Preparation of composite performance modifier: Weigh sodium dodecylsulfonate, sodium nitrate, coal powder with a fineness of 500 mesh, mix well, and then stand at 80°C for 2 days; ...

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Abstract

A red mud-based sintered light aggregate and a preparation method thereof, which belong to the technical field of comprehensive utilization of industrial solid waste and new ecological building materials, and are composed of the following raw materials in parts by weight: 40-80 parts of red mud, 10-30 parts of fly ash , 5-30 parts of coal gangue, 0-20 parts of silica fume, 10-20 parts of alkylating agent, 5-30 parts of nitrating agent, 30-60 parts of carbonaceous pore-forming agent and 10-30 parts of granulated binder; , red mud is measured in parts by weight on a dry basis. The main raw materials of the present invention are industrial solid wastes such as red mud, fly ash, coal gangue, silicon powder, etc., which are ecological and environmentally friendly; the composite performance regulator composed of alkylating agent and nitrating agent can effectively inhibit the red mud from decomposing when combined with a suitable roasting process. Radioactivity and alkali-fixing effect; the overall preparation process is simple, and existing equipment can be used for production, which effectively reduces costs and realizes large-scale consumption of red mud.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of industrial solid waste and new ecological building materials, and in particular relates to a red mud-based sintered light aggregate and a preparation method thereof. Background technique [0002] The red mud stockpile is large and the utilization rate is low. In 2005, the production of red mud in my country was 10 million tons, and in 2010, it was 30 million tons. It is estimated that the production will reach 35 million tons in 2015, and the cumulative stockpiles will reach more than 300 million tons. The rapid development of electrolytic aluminum, alumina and other related industries has led to a continuous increase in the accumulation of red mud, causing serious ecological problems such as groundwater, soil pollution, smog, and radioactivity exceeding the standard. Regrettably, the comprehensive utilization rate of red mud in 2010 was only 4% of the output in that year, and the util...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B18/04
CPCY02W30/91
Inventor 徐开东王继娜牛季收杨欢马先伟朱凯
Owner 江西林宇建设工程有限公司
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