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Method of preparing foamed air brick by taking iron tailings as main material

A technology for iron tailings and hollow bricks is applied in the preparation of hollow bricks and in the field of foamed hollow bricks, which can solve the problems of serious natural environment and destroy ecological balance, and achieve the effects of reducing consumption, good thermal insulation performance and light weight.

Active Publication Date: 2015-05-27
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accumulation of iron tailings occupies a large amount of reservoirs, mountains, and farmland, causing serious natural environmental problems and destroying the ecological balance

Method used

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  • Method of preparing foamed air brick by taking iron tailings as main material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Crush 58 parts by mass of iron tailings, 30 parts by mass of clay, 7 parts by mass of quicklime and 5 parts by mass of foaming agent and mix them according to the proportion to obtain a mixture. Add 16 parts by mass of water to the mixture and stir evenly to obtain a foamed hollow brick The bricks are dried at 80-100°C to a moisture content ≤2%, then calcined and foamed at 1050°C for 6 hours, and cooled to form a foamed hollow brick.

[0023] During the calcination and foaming process, the heating time to 500-600℃ is 4 hours, the decomposition of pyrite and siderite produces an exothermic peak, resulting in 6-8% thermogravimetric loss; when the temperature rises to 750-830℃ , The endothermic reaction slows down the heating rate, and the time for heating to this temperature range is controlled within 2-3 hours.

[0024] The foaming agent is composed of sodium carbonate, fly ash and expanded perlite, and the mass ratio is (0.3-0.5):1:(1-2). The particle size of the foaming ag...

Embodiment 2

[0027] Crush 60 parts by mass of iron tailings, 28 parts by mass of clay, 7 parts by mass of quicklime and 5 parts by mass of foaming agent and mix them according to the proportion to obtain a mixture. Add 15 parts by mass of water to the mixture and stir evenly to obtain a foamed hollow brick The bricks are dried at 80-100°C until the moisture content is ≤2%, then calcined and foamed at 1050°C for 5 hours, and cooled to form a foamed hollow brick. Other preparation parameters are the same as in Example 1.

[0028] According to GB / T5101-2003 "Ordinary Sintered Bricks", GB13544-2011 "Sintered Perforated Bricks", GB13545-2003 "Hollow Bricks and Hollow Bricklaying" and GB6566-2010 "Limits of Radionuclide for Building Materials", the prepared development The foamed hollow brick products are tested for compressive strength, durability and radioactivity. Compressive strength test result: average value is 10.7MPa, average value standard is ≥10MPa, minimum value is 8.9MPa, minimum value...

Embodiment 3

[0030] Crush 62 parts by mass of iron tailings, 28 parts by mass of clay, 6 parts by mass of quicklime and 4 parts by mass of foaming agent and mix them according to the proportion to obtain a mixture. Add 18 parts by mass of water to the mixture and stir to obtain a foamed hollow brick. The bricks are dried at 80-100°C to a moisture content ≤2%, then calcined and foamed at 1000°C for 6 hours, and cooled to form a foamed hollow brick. Other preparation parameters are the same as in Example 1.

[0031] According to GB / T5101-2003 "Ordinary Sintered Bricks", GB13544-2011 "Sintered Perforated Bricks", GB13545-2003 "Hollow Bricks and Hollow Bricklaying" and GB6566-2010 "Limits of Radionuclide for Building Materials", the prepared development The foamed hollow brick products are tested for compressive strength, durability and radioactivity. Compressive strength test results: average value is 11.0MPa, average value standard is ≥10MPa, minimum value is 9.1MPa, minimum value standard is ...

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Abstract

The invention discloses a method of preparing a foamed air brick by taking iron tailings as a main material. The method comprises the following steps: crushing iron tailings, clay, quick lime and a foamer and mixing the components in proportion to obtain a mixture; adding water into the mixture and uniformly stirring to obtain a foamed air brick blank; and then, sequentially drying, calcining and foaming and cooling and moulding to obtain the foamed air brick. According to the method disclosed by the invention, the iron tailings are effectively utilized, solid pollutants are reduced and the utilization efficiency of waste is improved, and meanwhile, the foamer is added to prepare the foamed air brick. The foamed air brick has the characteristics of small heat transfer coefficient, good sound isolating effect, light weight, high strength, corrosion resistance and the like. The foamed air brick disclosed by the invention has the characteristics of environmental friendliness, low production cost, simple raw material proportion and production process and the like, and the product performance of the foamed air brick reaches the national standard.

Description

1. Technical Field [0001] The invention relates to a method for preparing hollow bricks, in particular to a method for preparing foamed hollow bricks with iron tailings as the main material, and belongs to the technical field of building materials. 2. Background technology [0002] The new wall material represented by hollow bricks has the advantages of light bulk density, large thermal resistance, heat insulation, low cost, etc., and is an ideal material to replace solid bricks. Hollow bricks have become the first choice recommended by the national construction department. Moreover, the "Cai Shui Law [2011] No. 115" stipulates that new building materials produced with mining waste residue as the main raw material enjoy tax preferences. Research on hollow bricks has also achieved a lot of results, and hollow bricks can be made from materials such as rice husk ash, fly ash, coal gangue, mining waste, and high plastic clay. CN1188834A discloses a method for preparing sintered por...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B33/132
CPCY02P40/60
Inventor 姚运金卢芳蔡云牧冯乙巳秦家成
Owner HEFEI UNIV OF TECH
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