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Method for evaluating the reactivity of quicklime for sintering

An evaluation method, the technology of quicklime, applied in the field of iron ore sintering, can solve the problems of inability to evaluate the reactivity reasonably, and achieve the effect of strong reproducibility and accurate evaluation

Active Publication Date: 2016-12-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the defect that the reactivity of quicklime in the prior art cannot be reasonably evaluated when it is used in high-alkalinity sinter, thereby providing a new method for evaluating the reactivity of quicklime for sintering

Method used

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  • Method for evaluating the reactivity of quicklime for sintering
  • Method for evaluating the reactivity of quicklime for sintering
  • Method for evaluating the reactivity of quicklime for sintering

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Embodiment

[0043]Using steps S100 to S400 in the above method, the reactivity of the two kinds of quicklime for sintering, A and B, are compared and evaluated. First, two kinds of quicklime for sintering, A and B, were mixed with Fe 2 o 3 Mix the reagents evenly, take about 0.8 g of the mixture sample and press it into a sample with a diameter of 8 mm, set the temperature at 1250°C, and set the holding time at 1 minute, 2 minutes and 4 minutes. Then cool down according to step S300. Such as Figure 3A , 3B Shown is a schematic diagram of the morphologies of two kinds of quicklime after reacting and melting at different holding times.

[0044] Direct observation of two kinds of quicklime and Fe 2 o 3 The reagent reacts the melted sample at high temperature, and it can be seen that the spread area of ​​the A quicklime sample is larger than that of the B sample. Calculate the projected area of ​​the unit mass sample after melting and spreading, and the A sample is 62.8mm under differ...

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Abstract

The invention discloses a method for evaluating the reactivity of quicklime for sintering, which comprises the following steps: S100, the quicklime to be evaluated and Fe 2 o 3 The reagents are uniformly mixed to form a mixture sample, and the particle size of the mixture sample is ground and pressed into shape; S200, the pressed mixture sample is heated to a set temperature, and kept for a predetermined time, so that the mixture sample The quicklime and the Fe 2 o 3 Reagent reaction; S300, rapid cooling of the reacted mixture sample in a protective atmosphere; S400, determine the projected area of ​​the mixture sample per unit mass after cooling after melting and spreading, and the ferric acid generated by the mixture sample after cooling The percentage of the calcium phase, and on the basis of the projected area and the percentage, the reactivity of the quicklime is evaluated. The method for evaluating the reactivity of quicklime for sintering does not require special equipment, is simple and easy to operate, has strong reproducibility, and can accurately evaluate the reactivity of quicklime used for high-alkalinity sintered ore.

Description

technical field [0001] The present invention relates to iron ore sintering technology, more specifically, a method for evaluating the reactivity of quicklime for sintering. Background technique [0002] In the iron ore sintering technology, quicklime is an important calcium-based flux in the iron ore sintering process. It has two main functions: one is to strengthen the granulation of iron ore powder. Quicklime has a fine particle size and a large specific surface area. After being digested with water, it can form a colloidal solution, which can greatly improve the strength and stability of the sintered material, speed up the pelletizing speed, and improve the strength and thermal stability of dry and wet pellets. The second is to react with iron ore powder in the sintering process to form low melting point phases such as calcium ferrite. In actual production, there are many kinds of quicklime for sintering, and the quality varies greatly. [0003] At present, the evaluati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16G01N25/02
Inventor 张丽周茂军齐伟王炎文
Owner BAOSHAN IRON & STEEL CO LTD