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Bulk thermal insulation material with red mud

A technology of thermal insulation material and red mud, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of large maintenance, poor integrity, and good land occupation, and achieve low cost, strong integrity, Good vibration effect

Active Publication Date: 2006-11-29
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is made of bricks and has poor integrity. The annual overhaul of the electrolyzer still requires a lot of light insulation bricks and industrial Al 2 o 3 Powder, large amount of maintenance, high cost
On the other hand, alumina manufacturers discharge a large amount of red mud every year. As waste residue, it accumulates over time, and the amount of accumulation is getting larger and larger, occupying good land and polluting the environment. How to use a large amount of red mud waste residue has been a long-term effort. problem to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The particle weight gradation control of the dry red mud and refractory aggregate used is:

[0028] 8mm≤particle diameter d<15mm 19.7%

[0029] 3mm≤d<8mm material 16.9%

[0030] 14.7% for materials with 1mm≤d<3mm

[0031] 0.15mm≤d<1mm material 17.8%

[0032] 0.074mm≤d<0.15mm material 4.8%

[0033] The material with d<0.074mm is 26.1%.

[0034] The fineness of the refractory powder is controlled through a 200-mesh sieve, and the sieve residue is 4%.

[0035] Red mud bulk insulation material of the present invention, its batching weight percentage is composed of:

[0036] Dry Bayer red mud or sintering red mud 50%, clay refractory powder or high alumina refractory powder 30%, clay aggregate or high alumina bauxite aggregate 20%.

[0037] Index detection comparison:

[0038] The thermal insulation material of the Bayer process red mud of the present invention has a linear change rate of 10% after roasting at 950°C for 4 hours, and an average ...

Embodiment 2

[0045] The particle weight gradation control of the dry red mud and refractory aggregate used is:

[0046] 8mm≤particle diameter d<15mm 18.3%

[0047] 3mm≤d<8mm material 15.8%

[0048] 14.2% for materials with 1mm≤d<3mm

[0049] 0.15mm≤d<1mm material 17.6%

[0050] 0.074mm≤d<0.15mm material 4.9%

[0051] The material with d<0.074mm is 29.2%.

[0052] The fineness of the refractory powder is controlled through a 200-mesh sieve, and the sieve residue is 3%.

[0053] Red mud bulk insulation material of the present invention, its batching weight percentage is composed of:

[0054] Dry sintering red mud 50%, clay refractory powder 20%, high alumina bauxite aggregate 15%, perlite 15%.

Embodiment 3

[0056] The particle weight gradation control of the dried red mud used is:

[0057] 8mm≤particle diameter d<15mm 21.2%

[0058] 3mm≤d<8mm material 17.7%

[0059] 15.2% for materials with 1mm≤d<3mm

[0060] 0.15mm≤d<1mm material 17.9%

[0061] 0.074mm≤d<0.15mm material 4.7%

[0062] The material with d<0.074mm is 23.3%.

[0063] The fineness of the refractory powder is controlled through a 200-mesh sieve, and the sieve residue is 4.8%.

[0064] Red mud bulk insulation material of the present invention, its batching weight percentage is composed of:

[0065] Dry sintering red mud 70%, high alumina refractory powder 30%.

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Abstract

The invention relates to a bulk thermal insulation material with red mud which comprises (by weight percentage) dried red mud 20-80%, flame-proof powder 20-50%, flame-proof aggregate 0-30%, and pearlite 0-20%.

Description

technical field [0001] The invention relates to a red mud bulk thermal insulation material, which belongs to the technical field of unshaped refractory thermal insulation materials. Background technique [0002] At this stage, aluminum electrolytic cells are developing towards large-scale prebaked cells, and are becoming more and more mature. Its thermal field design adheres to the principle of "insulation at the bottom and heat dissipation at the side", with particular emphasis on the thermal insulation effect at the bottom of the tank. The design and material selection of the prebaked electrolytic cell should ensure that the temperature inside the carbon cathode material is greater than 850°C, because NaF will crystallize below 850°C, causing the volume expansion of the carbon cathode and the swelling of the carbon brick, reducing its service life. The method is to choose a good Lightweight insulation bricks are used as insulation layer, and industrial Al 2 o 3 Powder c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/14C04B14/18C04B14/04
CPCY02W30/91
Inventor 张凤炳曲顺祥肖亚明李文成孙敏李颍刘怀君鹿中科崔德森
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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