Regenerative castable prepared from waste main runner materials from blast furnace

A castable and blast furnace technology, which is applied in the field of unshaped refractory materials, can solve problems such as lowering of raw material grades, leakage of slag ditch, and potential safety hazards affecting blast furnace production.

Inactive Publication Date: 2017-11-17
SUZHOU NORETA NEW MATERIAL TECH
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  • Abstract
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  • Claims
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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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  • Regenerative castable prepared from waste main runner materials from blast furnace

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Experimental program
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Effect test

Embodiment 1

[0020] The proportion of aggregates with bauxite particle size ≤ 8-1mm is 40%; the proportion of aggregates with corundum particle size ≤ 8-1mm is 30%; the proportion of corundum aggregates with particle size ≤ 0-1mm is 3%; the proportion of corundum aggregates with particle size ≤ 0.088mm The proportion of powder is 3.85%; the proportion of waste main channel material fine powder with a particle size of ≤0.088mm is 6%; the silicon carbide with a particle size of ≤1mm is 5%, the metal silicon with a particle size of ≤1mm is 3%, and sodium tripolyphosphate is 0.15%; the 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 aggregates 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 pouring material manufactured by using waste blast furnace main channel material. Its technical solution: a recycled castable made by using the waste blast furnace main channel material, its components and mass percentage content are: 55-70% of the aggregate with a particle size of 1-8mm, and 55-70% of the aggregate with a particle size of 0-1mm 1-10%; 3-10% for corundum powder with particle size ≤0.088mm, 3-20% for waste main channel powder with particle size ≤0.088mm, 5-15% for silicon carbide with particle size ≤1mm, and 5-15% for silicon carbide with particle size ≤1.0mm 1-5% of metal silicon, 1-5% of auxiliary binder, 3-7% of alumina or silica powder with particle size ≤50μm; 2.5-7% of calcium aluminate cement. The invention provides a recycled castable that can be safely used. The proportion of fine powder of the discarded main ditch castable is not high, which is safe and reliable. The prepared recycled castable has good oxidation resistance and strong corrosion resistance, and can be safely used in blast furnace slag. Ditch and iron ditch production.

Description

technical field [0001] The invention relates to a monolithic refractory material, in particular to a regenerated castable made from waste blast furnace main channel material. Background technique [0002] Using 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 raw m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/66
Inventor 马少杰杨小猛
Owner SUZHOU NORETA NEW MATERIAL TECH
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