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Titanium ore cold briquetting for protecting blast furnace and its production method

A technology for blast furnace protection and production methods, which is applied in the field of iron and steel metallurgy, and can solve problems such as binder formulations and poor production processes

Active Publication Date: 2008-02-06
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, titanium-containing briquettes have major problems in terms of powder rate (ie, cold strength), RDI, high-temperature strength, etc. The root cause is that the binder formula and production process for producing titanium-containing briquettes are not good

Method used

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  • Titanium ore cold briquetting for protecting blast furnace and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Baosteel cooperates with Shanghai Aobao Industry and Trade Co., Ltd., adopts the briquetting production equipment and site of Shanghai Aobao Industry and Trade Co., Ltd., and uses Chengde ilmenite concentrate and Canadian titanium lump ore under-sieve powder in Baosteel stockyard as test raw materials. Using the above-mentioned composite binder 1 as the binder, a titanium-containing briquette numbered "Obao Titanium Ball 0762.2" was trial-produced, and its main properties are as follows:

[0018] TiO 2 28.7%, TFe 33.1%;

[0019] JIS drum strength is 75.7%, which is close to Baosteel sinter strength;

[0020] RDI (Japanese corporate standard) is 24.3%, which is better than the RDI index of Baosteel sintered ore, and is also better than the titanium-containing briquette of a plant that Baosteel blast furnace tried from October to December 1999. Its RDI is 45.0%:

[0021] The pulverization rate index after reduction at 900°C is 30.3%, which is significantly better than ...

Embodiment 2

[0024] Baosteel's No. 2 blast furnace started to use Opal titanium-containing briquettes produced by the invention to replace Panxi titanium lump ore. Its chemical composition and metallurgical performance indicators are shown in Table 1 and Table 2 below.

[0025] Table 1 The chemical composition of opal titanium-containing briquettes, %

[0026] Variety

[0027] Table 2 Metallurgical performance indicators of opal titanium-containing briquettes, %

[0028] Variety

[0029] After Baosteel's No. 2 blast furnace was used, the molten iron production level of the blast furnace was moderate, at 8800t / d; the air permeability index was 2.4-2.5; the furnace temperature was maintained at a high level, at 1505-1510°C. The practice of blast furnace production during this period shows that the process of titanium being reduced into molten iron is normal, indicating that titanium is effectively utilized in the furnace; compared with titanium lump ore, titanium briqu...

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Abstract

The chill-pressing titanium block to protect blast furnace comprises: 90-98% titanium powder, 2-10wt% composite adhesive composed of cement, polyvinyl alcohol and phosphodiester by proportion as 4-8:1-5:0-1; wherein, cement: cellulose is 5-10:1-5,epoxy resin:sodium humate is 8-10:0-2, waste molasses liquid:lime hydrate is 7-10:0-3, and waterglass:bentonite:silicasol is 7-10:0-2:0-1. The preparation method comprises: mixing material with adhesive, rolling, covering tightly the material, pressing to form; screening the crude block to re-press the powder less than 10mmm and form product. Compared with prior art, this invention increases mechanical strength, and reduces greatly the powder rate when screening powder.

Description

technical field [0001] The invention relates to iron and steel metallurgy, in particular to a production method of titanium ore cold briquettes for blast furnace protection. Background technique [0002] As a new type of raw material for blast furnace protection, titanium-containing cold-solidified pellets have been used by many steel plants. However, it was found that the existing titanium-containing compacts were in TiO 2 There are big problems in terms of content, blast furnace powder rate, RDI, high temperature strength and so on. As a result, the K value of the blast furnace increased by 0.2 during this period, and titanium powder adhered to the furnace wall. [0003] Chinese Patent No. 93103638.0 discloses "high-titanium cold-setting pellets", which adopts a low-temperature consolidation process instead of a high-temperature consolidation process to produce high-titanium cold-setting pellets, using a titanium content of 33-40%, a particle size of -200 mesh, and 22 T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/08C22B1/16
Inventor 李咸伟曹国相张美芳
Owner BAOSHAN IRON & STEEL CO LTD
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