Self-fluxing composite metallized pellet and production process thereof

A composite metal and self-fluxing technology, applied in the field of metallurgy and mineral engineering, can solve the problems of small particle size of metallized pellets, high energy consumption, low production capacity, etc., and achieve the effect of increasing the concentration of the atmosphere and the speed of reduction reaction

Inactive Publication Date: 2015-07-01
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a self-fluxing composite metallized pellet and its production process to solve the pr

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  • Self-fluxing composite metallized pellet and production process thereof
  • Self-fluxing composite metallized pellet and production process thereof

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[0030] The present invention will be further described in detail below in conjunction with the drawings.

[0031] Such as figure 1 The self-fluxing composite metalized pellet shown includes an inner core 1, a shell 2 wrapped around the inner core 1, and is characterized in that the inner core 1 is composed of iron ore, limestone, coal powder, and cement according to 330:300~ 350:80~120:6-9, the outer shell 2 is made by mixing iron ore and bentonite in a mass ratio of 1320:22-25, the core 1 has a particle size of 20-25mm, and the outer shell 2 The thickness is 5-10mm.

[0032] The exterior of the shell 2 is also covered with a layer of coal powder as the reducing agent 3. The mass of the coal powder is 5-8% of the mass of the iron concentrate in the shell 2, and the mass percentage of coal powder particles with a particle size of -120 mesh is greater than 80%.

[0033] The iron grade of iron concentrate is 54~66%, SiO 2 The content is 8-15%, and the mass percentage content of iron or...

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Abstract

The invention relates to the technical field of metallurgy and mineral engineering, and discloses a self-refluxing composite metallized pellet and a production process thereof. The self-refluxing composite metallized pellet comprises an inner core and an outer shell, wherein the inner core is formed by mixing iron ore concentrate, limestone, coal powder and cement in a proportion of 330:(300-350):(80-120):(6-9); the outer shell is formed by mixing iron core concentrate and bentonite in a mass ratio of 1320:(22-25), the grain size of the inner core is 20-25mm, and the thickness of the outer shell is 5-10mm. The production process for the self-refluxing composite metallized pellet comprises the following steps: preparing the inner core and packaging the outer shell to form a composite metallized pellet; packaging the composite metallized pellet with a reducing layer, distributing and drying the composite metallized pellet, reducing and roasting the composite metallized pellet, cooling and sorting the high-temperature reduced composite metallized pellet. According to the self-refluxing composite metallized pellet and the production process thereof disclosed by the invention, limestone is mixed into the inner core, and CO2 generated by heating and decomposing the limestone in a reducing process of the composite metallized pellet is used as an oxygen producer to participate in gasification reaction of the coal, so that CO concentration inside the pellet is increased, the reducing speed of the pellet is increased, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgy and mineral engineering, in particular to a self-fluxing composite metallized pellet with large particle size, high reduction speed and low energy consumption and a production process thereof. Background technique [0002] The traditional metallized pellets are made of iron concentrate and bentonite in a certain proportion and mixed evenly, and then the pellets with a particle size of 8-16mm are formed by a disc pelletizer. After the pellets are dried at low temperature, they are mixed with a certain proportion of reduced coal For mixing, the mixed material is added to the reduction furnace kiln (such as shaft furnace, rotary kiln, tunnel kiln and rotary hearth furnace, etc.) for reduction, and metallized pellets with high grade and high metallization rate can be obtained. The long reduction time, low production capacity and high energy consumption of metallized pellets limit their popularizati...

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Application Information

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IPC IPC(8): C22B1/24
CPCY02P10/20
Inventor 王明华展仁礼马胜军雷鹏飞权芳民邢德军鲁逢霖张志刚王欣张科王建平张颂尧
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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