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Preparation method of high-strength high-titanium pellets

A high-strength, pelletizing technology, which is applied in the preparation of high-titanium pellets and the preparation of high-strength high-titanium furnace-protected pellets, can solve problems affecting the operation of blast furnaces, and achieve the benefits of consolidation, increased strength, and effective Good for fully oxidized effect

Active Publication Date: 2016-06-29
CENT SOUTH UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

With TiO in the pellet 2 content increases, the strength of the pellets decreases rapidly, when the TiO in the pellets 2 When the content reaches 12%, the conventional pellet preparation method can only reach about 2000N / P pellet strength, especially when TiO 2 After the content exceeds 20%, the pellet strength decreases below 1000N / P, and this low-strength pellet is added to a large blast furnace (greater than 2500m 3 ), in the smelting process, it is easy to break and pulverize and affect the operation of the blast furnace

Method used

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  • Preparation method of high-strength high-titanium pellets
  • Preparation method of high-strength high-titanium pellets
  • Preparation method of high-strength high-titanium pellets

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] When TiO in high titanium pellets 2 When the content is 12%, vanadium-titanium magnetite concentrate and titanium medium ore are used for batching. The batching scheme is shown in Table 2. Among them, the content of vanadium-titanium magnetite concentrate particle size -0.074mm reaches 80%, the content of titanium medium ore particle size-0.074mm reaches 85%, and the specific surface area of ​​the pretreated mixture reaches 1650cm 2 / g. After drying the prepared green balls at 450°C, at T=1380.5 (100×12%) -0 . 16 Calcination is carried out under the condition of =925°C, and the sintering time is t=34.3ln(100×12%)-69.8=16min, and then sintering is carried out under the condition of 1225°C, and the sintering time is 70min. After sintering, strictly control the cooling rate. When cooling from the highest temperature to 1000°C, keep the cooling rate at 70°C / min, and when cooling from 1000°C to 200°C, cool at a rate of 60°C / min. The chemical composition and strength ind...

Embodiment 2

[0053] When TiO in high titanium pellets 2 When the content is 25%, vanadium-titanium magnetite concentrate, titanium concentrate, and ordinary magnetite concentrate are used for batching. The batching scheme is shown in Table 2. Among them, the content of vanadium-titanium magnetite concentrate particle size -0.074mm reaches 80%, the content of ordinary magnetite concentrate particle size -0.074mm reaches 80%, the content of titanium concentrate particle size -0.074mm reaches 85%, and the specific surface area of ​​the mixture is pretreated by moistening and grinding. up to 1800cm 2 / g. After drying the prepared green balls at 300°C, at T=1380.5 (100×25%) -0 . 16 Calcination is carried out under the condition of =825°C, and the sintering time is t=34.3ln(100×25%)-69.8=40min, and then sintering is carried out under the condition of 1250°C, and the sintering time is 50min. After sintering, strictly control the cooling rate. When cooling from the highest temperature to 1000...

Embodiment 3

[0055] When TiO in high titanium pellets 2 When the content is 45%, titanium concentrate is used for batching, and the batching scheme is shown in Table 2. Titanium concentrate particle size -0.074mm content reaches 85%, and the specific surface area of ​​the pre-treated mixture reaches 1900cm 2 / g. After drying the prepared green balls at 200°C, at T=1380.5 (100×45%) -0 . 16 Calcination is carried out under the condition of =750°C, and the sintering time is t=34.3ln(100×45%)-69.8=60min, and then sintering is carried out under the condition of 1250°C, and the sintering time is 40min. After sintering, strictly control the cooling rate. When cooling from the highest temperature to 1000°C, keep the cooling rate at 40°C / min, and when cooling from 1000°C to 200°C, cool at a rate of 25°C / min. The chemical composition and strength index of the obtained finished pellets are shown in Table 2. It can be seen that the residual FeO content in the pellets is 0.81%, and the strength re...

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Abstract

The invention discloses a preparation method of high-strength high-titanium pellets. According to the method, a mixed material with TiO2 content of 12-45wt% is subjected to high pressure roller grinding and wet grinding treatment to prepare pellets; after being dried, the pellets are placed in an oxidizing atmosphere to be subjected to low-temperature oxidizing roasting, and the roasted pellets are cooled after being sintered at high temperature, thus obtaining the high-titanium pellets with strength of greater than 2500N / P and TiO2 content of 12-45%; and the high-titanium pellets can meet the requirements of large blast furnaces of more than 2500m<3> for the strength of pellets, so as to play a role of protecting the lining of the blast furnace.

Description

technical field [0001] The invention relates to a preparation method of high-strength high-titanium furnace-protecting pellets, in particular to a preparation method of high-titanium pellets meeting the application requirements of large-scale blast furnaces, and belongs to the field of iron and steel metallurgy. Background technique [0002] How to effectively prolong the life of the blast furnace hearth, ensure stable and efficient production, and create good technical and economic indicators while ensuring the safety of the blast furnace hearth has always been a subject of concern and continuous exploration by major iron and steel enterprises. [0003] Since the use of titanium-containing materials for furnace protection has the advantages of simple process, convenient operation, flexible use, and quick results, it has become a conventional method for long-term furnace protection in blast furnace smelting. The mechanism of furnace protection of titanium-containing material...

Claims

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Application Information

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IPC IPC(8): C22B1/243C22B1/02
CPCC22B1/02C22B1/243
Inventor 甘敏范晓慧陈许玲刘树姜涛李光辉袁礼顺季志云周阳吕薇黄柱成杨永斌郭宇峰李骞张元波高露何向宁吕均强周训伟田志远孙亚飞
Owner CENT SOUTH UNIV
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