Preparation method of sintering flux for iron ore sintering

A technology of sintering flux and iron ore, which is applied in the field of metallurgical engineering, can solve the problems of increasing the burden of slag discharge and the increase of slag system, and achieve the effect of improving reducibility and strength, improving strength and increasing yield

Active Publication Date: 2015-01-14
CHONGQING UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

On the other hand, the addition of commonly used sintering flux also increases the slag system of sintering and steelmaking, which increases the burden of slag discharge on enterprises

Method used

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  • Preparation method of sintering flux for iron ore sintering
  • Preparation method of sintering flux for iron ore sintering
  • Preparation method of sintering flux for iron ore sintering

Examples

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preparation example Construction

[0025] The flow process of the sintering flux preparation method for iron ore sintering of the present invention is as follows figure 1 As shown, it specifically includes the following steps:

[0026] A) After the converter slag is dried at 120°C, it is pulverized into a powder. It is required that the particles with a particle size of -100 mesh in the powder account for more than 85% of the total weight of the powder.

[0027] It is required that particles with a particle size of -100 mesh account for more than 85% of the total weight of the powder in order to ensure that the converter slag powder can more fully react with oxygen during the subsequent oxidation roasting process.

[0028] B) The converter slag powder obtained in the previous step is oxidized and roasted in the air at a temperature of 800-1100°C, and kept at the roasting temperature for 1-2 hours.

[0029] In the process of oxidizing and roasting converter slag, the reaction (1) occurs when the temperature is ...

Embodiment 1

[0046] The main composition of the converter slag produced by steelmaking used in this example is shown in Table 1, wherein the mass percentage of CaO accounts for 40.21%, and the mass percentage of SiO 2 The mass percentage of TFe accounts for 14.69%, the mass percentage of TFe accounts for 18.44%, and the mass percentage of Al 2 o 3 The mass percentage accounts for 2.40%. The XRD pattern (X-ray diffraction pattern) of the converter slag is as follows figure 2 shown, where θ is the Bragg diffraction angle.

[0047]

[0048] Using the converter slag as a raw material, the sintering flux is prepared by oxidizing and roasting through the preparation method of the present invention, and the specific process is as follows:

[0049] The converter slag is dried at 120°C and crushed into powder. The particles with a particle size of -100 mesh in the powder account for more than 85% of the total weight of the powder; then, the converter slag powder is oxidized and roasted at ...

Embodiment 2

[0052] In this embodiment, the converter slag shown in Table 1 is used. Among its main components, CaO accounts for 40.21% by mass, SiO 2 The mass percentage of TFe accounts for 14.69%, the mass percentage of TFe accounts for 18.44%, and the mass percentage of Al 2 o 3 The mass percentage accounts for 2.40%. Using the converter slag as a raw material, the sintering flux is prepared by oxidizing and roasting through the preparation method of the present invention, and the specific process is as follows:

[0053] The converter slag is dried at 120°C and crushed into powder. The particles with a particle size of -100 mesh in the powder account for more than 85% of the total weight of the powder; then, the converter slag powder is oxidized and roasted in air at 900°C. And keep the temperature at the calcination temperature for 1-2 hours; after calcination, the product obtained is naturally cooled to room temperature, and the sintering flux product is obtained.

[0054] The resu...

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Abstract

The invention provides a preparation method of a sintering flux for iron ore sintering, which can solve the problem of waste recycling of converter slags, also can produce a low-cost sintering flux, and reduces the damages of converter slags on the environment. According to the invention, converter slags and air are fully reacted at a high temperature of 800-1100 DEG C, a main ingredient SFCA (complex calcium ferrite) in an obtained sintering flux product can reduce the melting point of the flux, so that the formation of a liquid phase in the process of sintering is facilitated, therefore, the energy consumption is reduced, conditions are provided for the improvement of the efficiency of a blast furnace, the maximum value of converter slags is utilized as much as possible, the recycling of metallurgical slags is implemented, and the energy conservation and emissions reduction of enterprises are facilitated. The preparation method of a sintering flux for iron ore sintering disclosed by the invention provides products and technical supports for the reduction of ironmaking and steelmaking production costs and the implementation of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to the technical field of metallurgical engineering, in particular to a method for preparing a sintering flux used for iron ore sintering. Background technique [0002] At present, in the production of steelmaking and ironmaking, a large amount of iron ore is usually used for sintering production. The sintering flux used in the sintering of iron ore is used to reduce the sintering temperature of the material to achieve the effect of energy saving. Generally, the sintering fluxes used in the production of enterprises are mostly quicklime, dolomite, lightly burned powder, etc., although they can play a good role in fluxing. However, long-term smelting production needs to purchase a large amount of flux, and the commercial price of commonly used sintering flux is not cheap. For example, the price of dolomite is usually 200~400 yuan / ton, and the price of quicklime and lightly burned powder is usually 300 yuan. ~600 yuan / ton, so auxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 吕学伟魏瑞瑞陈龙扈玫珑白晨光邱贵宝徐健张生富
Owner CHONGQING UNIV
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