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Ramming material based on alumina-chrome slag for ferrous metallurgy intermediate frequency furnaces and preparation method thereof

An aluminum-chromium slag and intermediate frequency furnace technology is applied in the field of ramming materials for iron smelting intermediate frequency furnaces and its preparation, which can solve the problems of difficult to obtain raw materials, high cost of intermediate frequency furnace lining, rising raw material prices, etc. Erosion properties, improved thermal shock stability, reduced microcrack effects

Inactive Publication Date: 2018-10-09
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, due to the lower and lower purity of these high-quality raw materials and limited reserves, the price of raw materials has risen, and the cost of producing intermediate frequency furnace linings is relatively high.
[0005] "A metallurgical electromagnetic induction intermediate frequency furnace ramming material" (CN103058669A) patent technology, using high alumina bauxite, magnesia, spinel and silica ultrafine powder as raw materials to prepare intermediate frequency furnace ramming material, although the material is compact And slag erosion resistance is excellent, but raw materials such as magnesia and spinel are not easy to obtain and the price is high; in addition, the proportion of dense high-alumina bauxite aggregate in the material is relatively high, which improves the thermal conductivity of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A ramming material for an intermediate frequency furnace for iron smelting based on aluminum chromium slag and a preparation method thereof. The preparation method described in this embodiment is:

[0032] First, 55-57wt% of aluminum chromium slag particles, 10-12wt% of tabular corundum particles, 18-20wt% of aluminum-chromium slag fine powder, 4.1-5wt% of silica powder and 7.1-8wt% of magnesia The fine powder is used as a raw material, mixed, and 5-6 wt% phosphoric acid solution of the raw material is added, stirred evenly, and packaged to obtain a ramming material for an intermediate frequency furnace for iron smelting based on aluminum chromium slag.

[0033] The ramming material for iron smelting intermediate frequency furnace based on aluminum chromium slag prepared in this example is tested: the bulk density is 3.11-3.30g / cm 3 The apparent porosity is 14-15.2%; the flexural strength is 8.1-9.0MPa; the compressive strength is 87.25-88.30MPa;

Embodiment 2

[0035] A ramming material for an intermediate frequency furnace for iron smelting based on aluminum chromium slag and a preparation method thereof. The preparation method described in this embodiment is:

[0036] First, 56-58wt% of aluminum chromium slag particles, 12-14wt% of tabular corundum particles, 17-19wt% of aluminum-chromium slag fine powder, 3.4-4.4wt% of silica powder and 5.7-7.1wt% of Magnesia fine powder is used as a raw material, mixed, and 5.7-6.7 wt% phosphoric acid solution of the raw material is added, stirred evenly, and packaged to obtain a ramming material for an intermediate frequency furnace for iron smelting based on aluminum chromium slag.

[0037] The ramming material for iron smelting intermediate frequency furnace based on aluminum chromium slag prepared in this example is tested: the bulk density is 3.25-3.38g / cm 3The apparent porosity is 14.7-15.9%; the flexural strength is 7.6-8.5MPa; the compressive strength is 86.5-87.55MPa;

Embodiment 3

[0039] A ramming material for an intermediate frequency furnace for iron smelting based on aluminum chromium slag and a preparation method thereof. The preparation method described in this embodiment is:

[0040] First, 57.5-59wt% of aluminum chromium slag particles, 11.2-13.8wt% of tabular corundum particles, 16.2-18.8wt% of aluminum-chromium slag fine powder, 2.7-3.7wt% of silica powder and 5-6.8wt% % magnesia fine powder as a raw material, mixed, and 6.4 to 7.4 wt % phosphoric acid solution of the raw material is added, stirred evenly, and packaged to obtain a ramming material for an intermediate frequency furnace for iron smelting based on aluminum chromium slag.

[0041] The ramming material for iron smelting intermediate frequency furnace based on aluminum chromium slag prepared in this example is tested: the bulk density is 3.30-3.45g / cm 3 The apparent porosity is 15.4-16.6%; the flexural strength is 8.6-9.5MPa; the compressive strength is 88.0-89.05MPa;

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Abstract

The invention relates to a ramming material based on alumina-chrome slag for ferrous metallurgy intermediate frequency furnaces and a preparation method thereof. According to the technical scheme, thepreparation method includes: mixing, by weight, 55-60% of alumina-chrome slag particles, 10-15% of tabular corundum particles, 15-20% of alumina-chrome slag fine powder, 2-5% of silica micropowder, and 5-8% of magnesia fine powder, adding 5-8% by weight of phosphoric acid solution, stirring well, and packaging to obtain the ramming material based on alumina-chrome slag for ferrous metallurgy intermediate frequency furnaces. The ramming material based on alumina-chrome slag for ferrous metallurgy intermediate frequency furnaces and the preparation method thereof have the advantages that the preparation method is simple, resources are comprehensively utilized, energy is saved, environment is protected, and the prepared ramming material has good resistance to molten iron and resistance to slag scouring, as well as good resistance to molten iron erosion and slag erosion.

Description

technical field [0001] The invention belongs to the technical field of ramming materials for intermediate frequency furnaces. Specifically relates to a ramming material for an intermediate frequency furnace for iron smelting based on aluminum chromium slag and a preparation method thereof. Background technique [0002] Aluminum chromium slag is a by-product derived from the smelting of metal chromium, ferrochrome and other alloys by thermite reduction reaction. Utilize metal aluminum and Cr in chrome ore when smelting metal chromium 2 o 3 A reduction reaction occurs to produce metal chromium, metal aluminum powder and Cr 2 o 3 A violent chemical reaction occurs in the molten state, and the generated Al 2 o 3 Rapidly transforms to corundum phase, and at the same time reacts with unreacted Cr 2 o 3 solid solution to generate aluminum-chromium solid solution, that is, aluminum-chromium slag. According to statistics, China will produce 500,000 to 600,000 tons of aluminu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/10
CPCC04B35/10C04B35/66C04B2235/3206C04B2235/3418C04B2235/77C04B2235/96C04B2235/9676
Inventor 赵惠忠王相辉赵鹏达张寒陈建威
Owner WUHAN UNIV OF SCI & TECH
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