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Core-spun wire-free titanium-containing furnace protection material and preparation method and using method thereof

A technology for protecting furnace charge and cored wire, which is applied in the field of non-cored wire containing titanium-containing furnace charge and its preparation, can solve the problems of low effective utilization rate of titanium, cumbersome processing of cored wire, etc. Furnace protection reaction cycle, the effect of large benefits

Active Publication Date: 2017-05-10
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional wire feeding method is to feed the cored wire with high titanium material (using 0.3~0.4mm iron sheet, the melting point is about 1450℃, ф 10~13mm) is fed from the tuyere at a feeding speed of 0.4~3.1 m / sec. This method can achieve an effective furnace protection effect, but the processing of the cored wire is cumbersome and the effective utilization rate of titanium is low.

Method used

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  • Core-spun wire-free titanium-containing furnace protection material and preparation method and using method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] To prepare titanium metal raw materials and iron metal raw materials, it is required that titanium in the titanium metal raw materials accounts for 50% of the total weight of all raw materials;

[0040] The titanium metal raw materials and iron metal raw materials are made into consumable electrodes, and a vacuum induction furnace is used for a vacuum melting, and then cooled with the furnace to a furnace temperature of ≤300°C, and cast into a primary ingot; the vacuum degree of the primary melting is ≤8Pa;

[0041] The primary ingot is smelted in a vacuum induction furnace for the second time, and then cooled with the furnace until the furnace temperature is ≤300°C, and cast into a secondary ingot; the vacuum degree of the secondary smelting is ≤5Pa; the diameter of the secondary ingot is ф300mm;

[0042] The secondary casting ingot is opened at 950°C, and the deformation of the open billet is 20%, and the ingot is obtained; the ingot is forged to a cross-sectional diam...

Embodiment 2

[0046] Method is with embodiment 1, and difference is:

[0047] (1) Titanium in titanium metal raw materials accounts for 65% of the total weight of all raw materials;

[0048] (2) The diameter of the secondary ingot is ф350mm;

[0049] (3) The secondary casting ingot is opened at 1050°C, and the deformation of the open billet is 25%; the ingot is forged to a cross-sectional diameter of ф260mm, and then an upsetting is performed at 920°C, and finally a second pier is performed at 850°C. Made of ferro-titanium alloy rods with a cross-sectional diameter of ф45mm;

[0050] (4) Surface treatment is carried out on the titanium-iron alloy bar to remove impurities and oxides, then heated to 950 °C, kept for 25 minutes, and then subjected to multi-pass hot rolling, the rolling temperature is 980 °C, and the reduction in each pass is 20~ 25%, until the diameter reaches 10mm;

[0051] The method of use is as follows: when blast furnace ironmaking, use tuyeres to feed wire into the bl...

Embodiment 3

[0053] Method is with embodiment 1, and difference is:

[0054] (1) Titanium in titanium metal raw materials accounts for 75% of the total weight of all raw materials;

[0055] (2) The diameter of the secondary ingot is ф400mm;

[0056] (3) The secondary casting ingot is opened at 1100°C, and the deformation of the open billet is 30%; the ingot is forged to a cross-sectional diameter of ф320mm, and then an upsetting is performed at 950°C, and finally a second pier is performed at 880°C. Made of ferro-titanium alloy rods with a cross-sectional diameter of ф50mm;

[0057] (4) Surface treatment is carried out on the ferro-titanium alloy bar to remove impurities and oxides, then heated to 1050 °C, kept for 20 minutes, and then subjected to multi-pass hot rolling, the rolling temperature is 1030 °C, and the reduction in each pass is 20~ 25%, until the diameter reaches 13mm;

[0058] The method of use is as follows: when blast furnace ironmaking, use tuyeres to feed the wire, put...

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Abstract

The invention provides a core-spun wire-free titanium-containing furnace protection material and a preparation method and using method thereof. The core-spun wire-free titanium-containing furnace protection material comprises 50-75% of Ti or 8-25% of Ti and the balance being iron according to the weight percentage. The preparation method comprises the following steps of: (1) preparing raw materials; (2) carrying out primary vacuum melting and casting; (3) carrying out secondary vacuum melting and casting; (4) cogging, forging, then carrying out primary upsetting and stretching and secondary upsetting and stretching; and (5) carrying out surface treatment, heating to 900-1050 DEG C, carrying out heat preservation for 20-30 minutes, carrying out multi-pass hot rolling till the diameter is 8-13mm, and then carrying out air cooling, wherein the initial rolling temperature is 900-1030 DEG C, and the reduction per pass is 20-25%. The using method comprises the step of putting the core-spun wire-free titanium-containing furnace protection material into a blast furnace hearth in a tuyere feeding manner during blast furnace iron making. The core-spun wire-free titanium-containing furnace protection material and the preparation method and using method thereof have the beneficial effects that the furnace protection reaction period is shortened; the furnace protection response is rapid and efficient; the technology investment is low; and the benefit is high.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a titanium-containing protective furnace charge without a cored wire, a preparation method and a use method thereof. Background technique [0002] The life of a blast furnace largely depends on the erosion of the hearth and the bottom of the furnace; in recent years, many manufacturers at home and abroad have used titanium-containing furnace protection materials to slow down the erosion of the lower part of the hearth and have achieved good results. Most of the commonly used titanium-containing furnace protection materials are vanadium-titanium ore beneficiation products, such as vanadium-titanium magnetite concentrate or titanium concentrate; where conditions permit, titanium-containing iron sand, ilmenite, perovskite, natural rutile, etc. can also be used; add The methods mainly include furnace top feeding and tuyere feeding. Because the tuyere fee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCC21B5/008
Inventor 沈峰满郑海燕温秋林姜鑫高强健
Owner NORTHEASTERN UNIV LIAONING
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