Method for preparing lightweight mullite refractory by high-alumina fly ash

A light-weight refractory material and high-alumina fly ash technology, which is applied in the comprehensive utilization of solid waste and the field of refractory materials, can solve the problems of waste of mineral resources and poor management of bauxite mining

Inactive Publication Date: 2014-08-06
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent decades, due to the ineffective mining management of bauxite, a large amount of low-grade bauxite ore has been produced due to mining the rich and abandoning the poor in the process of bauxite mining. Limited by the traditional aluminum smelting process, it has not been effectively exploited. Value-added utilization results in a large amount of Al-containing 2 o 3 waste of mineral resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Raw materials and ratio:

[0016] The addition of high aluminum fly ash is 60.0wt.%, requiring Al 2 o 3 Content ≥ 40.0wt.%, SiO 2 Content ≥ 40.0wt.%, Fe 2 o 3 Content≤3.0wt.%, TiO 2 Content ≤ 3.0wt.%, particle size less than 0.1mm; industrial alumina addition 40.0wt.%, requires α-Al 2 o 3 ≥98.0wt.%, the particle size is less than 0.10mm; the amount of aluminate cement added is 6.0wt.%; the amount of silica powder added is 2.0wt.%, requiring SiO 2 ≥98.0wt.%; the addition of sodium hexametaphosphate is 0.18wt.%; the loss-on-burn pore-forming agent is wood chips and sawdust, and the addition accounts for 15.0wt.% of the above-mentioned total ingredients, and its particle size is ≤2.0mm.

[0017] Synthetic mullite:

[0018] First, the raw material high-alumina fly ash and industrial alumina are mixed according to the above ratio, ball milled for 8 hours, dried at 150°C for 12 hours and fired at 1550°C for 4 hours in an air atmosphere, and then crushed and ground to ...

Embodiment 2

[0030] Raw materials and ratio:

[0031] The addition of high aluminum fly ash is 55.0wt.%, requiring Al 2 o 3 Content ≥ 40.0wt.%, SiO 2 Content ≥ 40.0wt.%, Fe 2 o 3 Content≤3.0wt.%, TiO 2 Content ≤ 3.0wt.%, particle size less than 0.1mm; industrial alumina addition 45.0wt.%, requires α-Al 2 o 3 ≥98.0wt.%, the particle size is less than 0.10mm; the amount of aluminate cement added is 8.0wt.%; the amount of silica powder added is 2.0wt.%, requiring SiO 2 ≥98.0wt.%; the addition of sodium hexametaphosphate is 0.2wt.%; the addition of the burn-out pore-forming agent accounts for 10.0wt.% of the above-mentioned total ingredients, which is 5.0% polystyrene balls and 5.0% sawdust. Particle size ≤ 2.0mm,.

[0032] Synthetic mullite:

[0033] First, the raw material high-alumina fly ash and industrial alumina are mixed according to the above ratio, ball milled for 8 hours, dried at 150°C for 12 hours and fired at 1550°C for 4 hours in an air atmosphere, and then crushed and g...

Embodiment 3

[0045] Raw materials and ratio:

[0046] The addition of high aluminum fly ash is 58.0wt.%, requiring Al 2 o 3 Content ≥ 40.0wt.%, SiO 2 Content ≥ 40.0wt.%, Fe 2 o 3 Content≤3.0wt.%, TiO 2 Content ≤ 3.0wt.%, particle size less than 0.1mm; industrial alumina addition 42.0wt.%, requires α-Al 2 o 3 ≥98.0wt.%, the particle size is less than 0.10mm; the amount of aluminate cement added is 5.0wt.%; the amount of silica powder added is 2.0wt.%, requiring SiO 2 ≥98.0wt.%; the addition of sodium hexametaphosphate is 0.18wt.%; the addition of polystyrene balls as a burn-out pore-forming agent accounts for 14.0wt.% of the total ingredients, and its particle size is ≤2.0mm.

[0047] Synthetic mullite:

[0048] First, the raw material high-alumina fly ash and industrial alumina are mixed according to the above ratio, ball milled for 8 hours, dried at 150°C for 12 hours and fired at 1550°C for 4 hours in an air atmosphere, and then crushed and ground to obtain different particle siz...

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Abstract

The invention relates to a method for preparing a lightweight mullite refractory by high-alumina fly ash and relates to the technical fields of solid waste comprehensive utilization and refractories. According to the method, waste from a power plant, namely high-alumina fly ash, is used as a raw material; commercial alumina is added according to the composition design; the mixture is fired and crushed to prepare lightweight mullite aggregate and lightweight fine powder, with different granularities; then silicon dioxide fine powder is additionally added; polystyrene spheres or sawdust is used as a pore-forming agent, aluminate cement is used as a gelling agent, and sodium hexametaphosphate is used as a water reducer; the lightweight mullite refractory is prepared through the processes such as forming by vibration pouring, curing, drying and sintering. The main high-temperature-resistant phase of the lightweight refractory is mullite phase and corundum phase; the lightweight mullite refractory comprises the main chemical constituents: 55.0-70.0 wt% of Al2O3, 25.0-40.0 wt% of SiO2 and 0-5.0 wt% of other impurities. Compared with the prior art, the method has the characteristics of wide raw material source, low production cost, low energy consumption, high mullite content, high performance, long service life, and simple operation in the preparation process; significant economic and environmental benefits can be generated.

Description

Technical field: [0001] The invention relates to a method for preparing mullite lightweight refractory materials by using high-alumina fly ash, and relates to the technical fields of comprehensive utilization of solid waste and refractory materials. Background technique: [0002] Industrial furnaces are the main energy-consuming equipment in industrial production, and the annual energy consumption is huge. Especially in the thermal processing process in metallurgy, building materials, ceramics, glass, chemical and electromechanical enterprises, the energy consumption of industrial furnaces can account for the total 40-70% of energy consumption. However, the heat loss of various industrial kilns is generally very large. In most cases, their thermal efficiency is low, the energy utilization rate is less than 30%, and 30-60% of the heat loss is through the kiln insulation. It is caused by the heat storage and heat dissipation of the material. In order to improve energy utiliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 陈凯黄朝晖房明浩刘艳改吴小文李小超
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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