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Non-oxide composite refractory materials for molten iron chute

A non-oxide and refractory material technology, applied in the field of refractory material manufacturing, can solve problems such as slag resistance, unfavorable iron corrosion, oxidative deterioration of steel fibers, and impact on service life, etc., to achieve short construction drying time, strong oxidation resistance, and fire resistance high degree of effect

Inactive Publication Date: 2008-04-23
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But silica brings a lot of SiO 2 , which is detrimental to the slag resistance and iron corrosion of the material, thus affecting the service life; the steel fiber is added to improve the thermal shock resistance, but when the molten iron is above 1400°C, the steel fiber is easy to oxidize and deteriorate, which will affect the material performance instead.

Method used

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  • Non-oxide composite refractory materials for molten iron chute
  • Non-oxide composite refractory materials for molten iron chute

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Embodiment Construction

[0019] Table 1 is the main composition (wt%) of the examples of the invention and the comparative examples, and Table 2 is the performance of the samples of the examples of the invention and the comparative examples.

[0020] Table 1

[0021]

[0022] Table 2

[0023]

[0024] illustrate: * (1) After the sample was subjected to 1450°C × 3h in an oxidizing atmosphere, a bubble-like enamel layer with pores appeared on the surface of ASCZ1 and ASCZ2, and the surface was uneven. There is a slight error in measuring the size of the sample, which makes the data too large.

[0025] Note * (2) The oxidation resistance is evaluated by the thickness of the oxide layer of the sample. The thicker the oxide layer, the worse the oxidation resistance. The surface of the glaze layer of the sample of the embodiment is dense and high in strength after firing; while the surface of the glaze layer of the sample of the comparative example is bubbly, the strength is very low, and it is e...

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Abstract

The invention relates to a technology for preparation of refractory material, and especially to a composite refractory of non-oxidized substance used in a hot-metal launder of consecutive pre-processing. The composite refractory of non-oxidized substance used in a hot-metal launder is characterized in that it contains (wt %) 50-70 % of corundum material, 15-30 % of silicon carbide, 3-10 % of silicon nitride, 3-10 % of silicon nitride tiny powder, 1-5 % of charcoal material, 1-3 % of silicon anti-oxidization agent, 6-15 % of additional silicasol astringent, and a few additives containing anti-knock agent and dispersing agent with 0.15-1.5 % by wt. The refractory material of the said invention can resist the erosion of the hot-metal and the molten ash and is of strong erosion ability, uniform and high-integrity structure, high intensity at a medium-high-temperature, strong stability of resistance to heat shocks and of volume of material, and strong resistance to oxidation, so it adapts to the process requirement of the desired hot-metal launder of consecutive pre-processing.

Description

(1) Technical field [0001] The invention relates to a refractory material manufacturing technology, in particular to a non-oxide composite refractory material for molten iron launders in continuous pretreatment of molten iron. (2) Background technology [0002] In the iron and steel smelting process, molten iron pretreatment technology is widely used. However, the technologies currently used in the world are segmented, cross-regional, and discontinuous processes, so there are certain defects in processing efficiency, energy saving, automation, and simplification. Japan has recently put forward a brand-new concept of "continuous treatment of molten iron", through intensification and continuousization of the discontinuous desiliconization, dephosphorization and desulfurization of molten iron across regions, so as to achieve the minimum investment in equipment and the effective use of energy and resources. Purpose. [0003] Although the existing molten iron pretreatment refra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/10
Inventor 甘菲芳石洪志
Owner BAOSHAN IRON & STEEL CO LTD
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