Method for manufacturing crushing pellet sinter

A manufacturing method and a technology for sintering ore, which are applied in the field of blast furnace ironmaking, can solve problems such as difficult implementation, poor green ball strength, and difficult control, and achieve the effects of simplified operation, increased stacking angle, and favorable low-temperature reduction.

Active Publication Date: 2013-06-19
ANGANG STEEL CO LTD
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  • Application Information

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Problems solved by technology

Laboratory tests and practical experience in industrial production show that for the preparation process of green pellets, green pellets with a diameter of 9mm are produced. Since the diameter is in the growth range of the core of the cue ball, the strength of the green pellets i

Method used

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  • Method for manufacturing crushing pellet sinter
  • Method for manufacturing crushing pellet sinter
  • Method for manufacturing crushing pellet sinter

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Embodiment Construction

[0018] Below by embodiment the present invention will be further described.

[0019] In the embodiment of the present invention, double-layer green pellets are prepared in two steps on a disc pelletizer. The diameter of the pelletizing machine is 1000mm, the rotating speed is 32 rpm, and the inclination angle is 47°. The ball-making process is divided into three stages: cue ball formation, cue ball growth, and raw ball compaction. First, add the mixed high-alkalinity materials into the rotating pelletizer with a small shovel, add water to make cue balls, and then continuously add water and feed materials. The amount of each batch is 10kg, so that the cue balls grow to a diameter of 25-30mm. Use a 25mm sieve to sieve out the raw balls of the particle size, clean the pelletizing disk, and then pour it into the pelletizing disk for secondary pelletizing of the low-alkalinity flux material rolled out. After the green balls are rolled tightly for 2 minutes When the diameter reach...

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Abstract

The invention provides a method for manufacturing crushing pellet sinter. The method comprises the following steps: 1) using a secondary pelletizing method: first adding mixed raw materials with alkalinity value of 2-2.2 into a balling machine to make cue balls, and when the diameter of the cue ball reaches 25-30 mm, rolling a prepared raw material with alkali value of 0.8-0.9, so that the finished green-ball has a diameter of 35-40 mm; 2) roasting the finished double-layer green-ball according to a conventional roasting pelletizing process; and 3) crushing the roasted pellets by a crusher, and sieving out a crushing pellet sinter product with particle level higher than 5 mm. The invention has simple production process and reasonable product structure, effectively solves the problem of an ordinary fluxed pellet, such as strict requirements on roasting temperature range and easy adhesion during roasting; and the crushing pellet sinter combines advantages of both pellets and sinter, eliminates phenomenon of abnormal expansion or reduction hysteresis in the reduction of the pellet, and gains increased angle of repose and hardly rolls after crushing, so as to facilitate material distribution of blast furnace.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking in iron and steel metallurgy, in particular to a method for manufacturing sintered ore for blast furnaces. Background technique [0002] The existing sinter manufacturing method is: mix fine-grained iron-containing raw materials with fuel and flux in a certain proportion, add water to moisten and mix them, and then spread them on the sintering machine, ignite, draw air, and use the fuel in the sinter to burn. High temperature, and then a series of physical and chemical reactions occur, some low melting point substances are formed, a certain amount of liquid phase is formed, the iron mineral particles are wetted and bonded, and a porous block product with a certain strength is formed after cooling - sinter . [0003] Practice has shown that the sintering process is not suitable for fine-grained ore concentrate powder, but suitable for the pellet process. Therefore, the development...

Claims

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Application Information

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IPC IPC(8): C22B1/14
Inventor 周明顺翟立委刘杰张辉
Owner ANGANG STEEL CO LTD
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