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Regenerated castable manufactured by waste main blast furnace trough castables

A technology for castables and blast furnaces, which is applied in the removal of solid waste, etc., and can solve problems such as safety hazards affecting blast furnace production, lower raw material grades, and increased impurities

Inactive Publication Date: 2009-12-30
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Judging from the above literature, the current domestic technology for waste refractory treatment is still in its infancy. Due to the increase in raw material prices, dense corundum raw materials are rarely used. Most of the castables used in blast furnace main channels are sub-white corundum and brown corundum. Mainly, if a high proportion of recycled castables are used, the grade of the raw materials will be lowered, and the impurities will increase. If the low-melting point substances increase, the local melting loss will cause the slag channel to leak, and there will be safety hazards affecting the production of the blast furnace.

Method used

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  • Regenerated castable manufactured by waste main blast furnace trough castables

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Embodiment 1

[0020] The aggregate proportion of alumina particle size ≤ 8-1mm is 40%; the aggregate proportion of corundum particle size ≤ 8-1mm is 30%; the proportion of corundum aggregate particle size ≤ 0-1mm is 3%; the corundum particle size ≤ 0.088mm The proportion of powder is 3.85%; the proportion of waste main channel material fine powder with particle size ≤ 0.088mm is 6%; silicon carbide with particle size ≤ 1mm is 5%, metal silicon with particle size ≤ 1mm is 3%, sodium tripolyphosphate is 0.15%; particle size is ≤ 50μm Alumina micropowder 4%; calcium aluminate cement 3%; asphalt 2%, the softening point of asphalt powder is 125°C.

Embodiment 2

[0022] The proportion of aggregates with corundum particle size ≤ 8-1mm is 56.05%; the proportion of alumina aggregate with particle size ≤ 0-1mm is 1%; the proportion of corundum fine powder with particle size ≤ 0.088mm is 10.0%, and the abandoned main ditch with particle size ≤ 0.088mm The proportion of fine powder is 10%, silicon carbide with a particle size of ≤1mm is 15%, silicon metal with a particle size of ≤1mm is 1%, sodium hexametaphosphate is 1%, silica micropowder is 3%, calcium aluminate cement is 4%, and asphalt is 0.95%. The softening point of asphalt powder is 120°C.

Embodiment 3

[0024] The proportion of aggregates with corundum particle size ≤ 8 ~ 1mm is 32.45%, the proportion of aggregates with corundum particle size ≤ 8 ~ 1mm is 25%, the proportion of corundum aggregates with particle size ≤ 0 ~ 1mm is 3%, particle size ≤ 0.088 The proportion of corundum fine powder in mm is 5%, the proportion of waste main channel material fine powder with particle size ≤0.088mm is 10%, silicon carbide with particle size ≤0.074mm is 5%, metal silicon with particle size ≤1mm is 5%, sodium hexametaphosphate 0.05 %, particle size ≤ 50μm alumina micropowder 3%, calcium aluminate cement 2.5%, asphalt 4%, the softening point of asphalt powder is 120°C.

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Abstract

The invention discloses a regenerated castable manufactured by waste main blast furnace trough castables. The technical proposal is as follows: the regenerated castable comprises the components with mass percents as follows: 55-70 of aggregates with granularity of 1-8mm, 1-10 of aggregates with granularity of 0-1mm, 3-10 of corundum powder with granularity less than or equal to 0.088mm, 3-20 of waste main trough castable powder with granularity less than or equal to 0.088mm, 5-15 of silicon carbide with granularity less than or equal to 1mm, 1-5 of metallic silicon with granularity less than or equal to 1mm, 1-5 of auxiliary bonding agents, 3-7 of alumina or silicon oxide powder with granularity less than or equal to 50mu m and 2.5-7 of calcium aluminate cement. The invention provides a regenerated castable which can be used safely. The waste main trough castables have low fine powder proportion and are safe and reliable. The prepared regenerated castable features good oxidation resistance and strong erosion resistance and can be safely used for production in blast furnace slag troughs and iron runners.

Description

technical field [0001] The invention relates to an unshaped refractory material, in particular to a regenerated castable made from waste blast furnace main channel material. Background technique [0002] The use of waste blast furnace main channel materials to manufacture recycled castables can reduce costs, increase the degree of recycling of refractory resources, and reduce waste of resources. The technology in this respect has been reported both at home and abroad. For example, "Baosteel Technology" 2008, (2): 77-80 pages, publicly reported the basic situation of waste refractory materials at home and abroad, introduced in detail the situation of Baosteel's waste main channel castables, combined with the waste main channel materials after use characteristics have been intensively researched and developed. The dense corundum raw material was successfully extracted from the discarded main ditch castable. The physical index of the raw material met the requirements of new r...

Claims

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Application Information

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IPC IPC(8): C04B35/66B09B3/00
Inventor 徐国涛李淑忠张洪雷刘黎王悦陈华圣
Owner WUHAN IRON & STEEL (GROUP) CORP
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