CN-118821460-B - Method and system for evaluating stability of blast furnace slag

CN118821460BCN 118821460 BCN118821460 BCN 118821460BCN-118821460-B

Abstract

The invention belongs to the technical field of blast furnace slag, and particularly relates to a stability evaluation method and system of blast furnace slag, which are used for researching the characteristics of the blast furnace slag, obtaining stability characterization bases of different temperature sections divided by viscosity change according to a viscosity temperature curve, calculating the most value range of the stability characterization bases of the different temperature sections and correspondingly obtaining a fractional range, converting the most value range into corresponding indexes of the stability characterization bases in the different temperature sections, calculating the influence weights of the blast furnace slag components on the stability characterization bases in the different temperature sections, carrying out normalization treatment on each influence weight, and calculating to obtain the stability evaluation index of the blast furnace slag. The method is applied to blast furnace production practice, is suitable for evaluating the stability of all blast furnace slag, synthesizes the slag stability influence factors of different temperature sections in the full viscosity range, converts the weight of the influence indexes of the combined components on the different temperature sections into stability fractions, quantitatively characterizes the slag stability, guides the slag making system and selects reasonable slag component intervals.

Inventors

FAN XIAOYUE
WU HONGZHEN
ZHANG YIJIAN
ZHANG JIANLIANG
JIAO KEXIN
WANG CUI
ZHANG LEI
LIU YANXIANG

Assignees

北京科技大学

Dates

Publication Date: 20260512
Application Date: 20240710

Claims (6)

1. A method for evaluating the stability of blast furnace slag is characterized by comprising the following steps: S1, researching the characteristics of blast furnace slag, and obtaining stability characterization basis of different temperature sections divided by viscosity change according to a viscosity-temperature curve, wherein the different temperature sections divided by viscosity change are specifically 3 temperature sections, wherein T is less than T Melt Property ,T=T Melt Property ,T＞T Melt Property ; In the temperature section T Melt Property , the stability of slag is mainly affected by alkalinity, and the change of alkalinity affects the precipitation content of solid phase particles, so that the change of the precipitation amount of solid phase along with the temperature fluctuation, namely Characterizing the stability of the temperature zone slag; a T=T Melt Property temperature section, wherein the stability of the slag is mainly influenced by alkalinity, and the change of the alkalinity influences the type of precipitated solid phase so that the slag meltability temperatures are different, and therefore, the degree of superheat, namely Deltat, is used for representing the stability of the slag in the temperature section; T is T Melt Property temperature section, slag stability is mainly affected by temperature, the change of viscosity along with temperature fluctuation is used To characterize the stability of the slag in this temperature zone; S2, calculating the maximum value range of the stability representation basis of different temperature sections and correspondingly obtaining a fraction range [0,100], and converting the maximum value range into the stability representation basis corresponding index S i in the different temperature sections; S3, calculating influence weights K i of the blast furnace slag components on the stability characterization basis in different temperature sections; S4, carrying out normalization processing on each influence weight to obtain K i '; s5, calculating to obtain a blast furnace slag stability evaluation index CTS= 。
2. The method for evaluating the stability of the blast furnace slag according to claim 1, wherein in the step S2, the maximum value ranges according to which the stability of different temperature sections is characterized are calculated and are corresponding to the fractional ranges [0,100], specifically, the index ranges of the solid phase precipitation amount, the superheat degree and the viscosity, which are respectively determined according to the maximum values of the absolute values of the changes of the temperature fluctuation, respectively correspond to the fractional ranges [0,100].
3. The method for evaluating the stability of the blast furnace slag according to claim 2, wherein in the step S2, the stability characterization in the different temperature sections is specified according to the corresponding index S i , and the stability characterization in the different temperature sections is specified according to the fraction in the fraction range [0,100] corresponding to each of the most value ranges.
4. The method for evaluating the stability of the blast furnace slag according to claim 1, wherein in the step S3, the influence weight K i of the stability characterization basis of the blast furnace slag component in the different temperature sections is specifically an average value of linear fitting values of each index under the series of slag components in the different temperature sections.
5. The method for evaluating the stability of blast furnace slag according to claim 4, wherein in the step S4, the normalization process is specifically performed by K i ' = 。
6. A system for evaluating the stability of a blast furnace slag according to any one of claims 1 to 5, comprising: the stability characterization basis determining module is used for researching the characteristics of the blast furnace slag and obtaining stability characterization basis of different temperature sections divided by viscosity change according to a viscosity temperature curve; the stability representation basis corresponding index determining module calculates the maximum value range of the stability representation basis of different temperature sections and corresponds to the score range [0,100], and converts the maximum value range into the stability representation basis corresponding index S i in different temperature sections; The influence weight determining module of the stability characterization basis is used for calculating the influence weight K i of the blast furnace slag component on the stability characterization basis in different temperature sections; The normalization processing module is used for performing normalization processing on each influence weight to obtain K i '; the blast furnace slag stability evaluation index determination module is used for calculating and obtaining a blast furnace slag stability evaluation index CTS= 。

Description

Method and system for evaluating stability of blast furnace slag Technical Field The invention relates to the technical field of blast furnace slag, in particular to a method and a system for evaluating stability of blast furnace slag. Background The control of stable furnace conditions is a primary task of the operation of the blast furnace and is also a basis for realizing high-efficiency, low-consumption and green smelting of the blast furnace. Part of iron and steel enterprises effectively influence the forward running of a blast furnace by the quality fluctuation of raw fuel, and the blast furnace burden structure is adjusted, so that the components of blast furnace slag are greatly changed from the prior iron-making production, the blast furnace slag is used as one of byproducts of the iron-making process, the metallurgical performance of the blast furnace slag is an important factor that the blast furnace keeps stable forward running and obtains good technical and economic indexes, and the blast furnace slag is used as a high-temperature melt, and the physical and chemical properties of the blast furnace slag are mainly influenced by temperature and the components. The existing blast furnace slag stability evaluation research is mainly focused on a high-temperature section with the temperature not less than the melting temperature, and the stability performance is qualitatively characterized by analyzing the change degree or the degree of superheat of the viscosity along with the fluctuation of the temperature. The change of the blast furnace slag composition has opposite influence trend on the slag stability of different temperature sections, and has different influence degrees on the viscosity, and the slag stability of the full-viscosity section is only represented by a single index to be inconsistent with the change rule of the actual metallurgical property of the slag. At present, the comprehensive research on the stability of different sections of the blast furnace slag is less, and most of stability evaluation methods are qualitative or semi-quantitative analysis, so that the stability evaluation indexes of the blast furnace slag are respectively considered for different temperature sections, and a method for quantitatively evaluating the stability of the blast furnace slag in different comprehensive sections is established. Disclosure of Invention In order to solve the problems in the prior art, the main purpose of the invention is to provide a method and a system for evaluating the stability of blast furnace slag, which comprehensively consider solid phase precipitation amounts, superheat degree and viscosity factors of different temperature sections of an overall viscosity section and provide important basis for evaluating the stability of the blast furnace slag. In order to solve the technical problems, according to one aspect of the present invention, the following technical solutions are provided: A method for evaluating the stability of blast furnace slag comprises the following steps: S1, researching the characteristics of blast furnace slag, and obtaining stability characterization basis of different temperature sections divided by viscosity change according to a viscosity-temperature curve; S2, calculating the maximum value range of the stability representation basis of different temperature sections and correspondingly obtaining a fraction range [0,100], and converting the maximum value range into the stability representation basis corresponding index S i in the different temperature sections; S3, calculating influence weights K i of the blast furnace slag components on the stability characterization basis in different temperature sections; S4, carrying out normalization processing on each influence weight to obtain K i'; s5, calculating to obtain a blast furnace slag stability evaluation index CTS= ΣK i'Si. In the step S1, different temperature sections divided by viscosity change are specifically 3 temperature sections, wherein T < T Melt Property ,T＝T Melt Property ,T＞T Melt Property . As a preferable scheme of the method for evaluating the stability of the blast furnace slag, in the step S1, a temperature section T < T Melt Property is mainly influenced by alkalinity, and the change of the alkalinity influences the precipitation content of solid phase particles, so that the change of the precipitation amount of solid phase along with the temperature fluctuation, namelyThe stability of the slag in this temperature zone was characterized. In the step S1, the temperature section T=T Melt Property is mainly influenced by alkalinity, and the change of the alkalinity influences the type of precipitated solid phase so as to lead the slag meltability temperature to be different, so that the degree of superheat, namely Deltat, is used for representing the stability of the slag in the temperature section. As a preferable scheme of the method for evaluating the stability of the blast