阅读说明：本技术 一种提高烧结矿软熔性能的混匀配矿结构 (Blending ore blending structure for improving softening and melting performance of sinter ) 是由 李军 史先菊 张树华 沈文俊 彭道胜 肖慧 于 2020-11-19 设计创作，主要内容包括：一种提高烧结矿软熔性能的混匀配矿结构,其原料组成及wt%含量为：褐铁矿：40～55%,致密赤铁矿：10～15%,其它赤铁矿15～40%,镜铁矿：不超过10%,废料：0～5%。本发明既能使废物得到综合利用,减少对环境的污染,又能使烧结的初始软化温度提升20-30℃,软融区间的温度降低30-40℃,从而达到110℃以内。(A blending ore blending structure for improving the softening and melting properties of sintered ore comprises the following raw materials in percentage by weight: limonite: 40-55%, dense hematite: 10-15%, other hematite 15-40%, and specularite: not more than 10%, waste: 0 to 5 percent. The invention can comprehensively utilize the waste, reduce the pollution to the environment, increase the initial softening temperature of sintering by 20-30 ℃, and reduce the temperature in the softening and melting region by 30-40 ℃ so as to reach within 110 ℃.)

1. A blending ore blending structure for improving the softening and melting properties of sintered ore comprises the following raw materials in percentage by weight: limonite: 40-55%, dense hematite: 10-15%, other hematite 15-40%, and specularite: not more than 10%, waste: 0 to 5 percent.

2. The blending and ore blending structure for improving the softening and melting performance of the sinter as claimed in claim 1, wherein: the weight percentage content of specularite is not more than 8%.

3. The blending and ore blending structure for improving the softening and melting performance of the sinter as claimed in claim 1, wherein: the weight percentage content of the waste material is not more than 3.5 percent.

4. The blending and ore blending structure for improving the softening and melting performance of the sinter as claimed in claim 1 or 3, wherein: the waste material is gas ash, dust-removing ash, iron-making or steel-making or sintering iron-containing sundries.

Technical Field

The invention relates to a blending and ore-blending structure of sintered ore, and particularly belongs to a blending and ore-blending structure for improving the softening and melting performance of the sintered ore.

Background

The blast furnace raw material has higher softening starting temperature and narrower softening interval, which is beneficial to reducing the height of a softening zone and thinning the thickness, thereby improving the air permeability of a material column and being convenient for increasing the production and reducing the consumption of the blast furnace.

The sinter is used as the main raw material of the blast furnace, and the soft melting performance of the sinter has important influence on the stable and smooth operation of the blast furnace. The reflow property of the sintered ore mainly refers to volume reduction caused by reduction of voids generated by pores and stacking in the sintered ore under a high-temperature reducing atmosphere. The soft melting performance of the sinter depends on the mineral composition and structure of the sinter and is characterized by the uniformity of the mineral composition and structure of the sinter.

The sintering process is an incomplete chemical reaction of iron-containing minerals and flux minerals at high temperature, the reaction degree is different, due to the complexity and the heterogeneity of the sintering process, the research on the influence factors of the soft melting performance of the sintering ore mainly focuses on the process parameters (alkalinity of the sintering ore) and the specific mineral content (silicon dioxide, magnesium oxide, aluminum oxide and ferrous oxide) of the sintering process, the change of the self performance of the iron-containing raw materials participating in the chemical reaction of the sintering process is not studied in detail, the research on the soft melting performance of the iron ore is limited to lump ores such as south Africa lump, Australia lump, Hainan lump and the like, along with the deep research on the metallurgical performance of the sintering ore, the important influence of the blending ore blending structure change on the composition and the structural uniformity of the sintering ore minerals is found, but the research on the influence of the blending structure on the soft melting performance of the sintering ore is vacant at present, aiming at the blank, a blending ore blending structure for improving the sintering soft melting performance is provided.

The search has found that: the existing research indicates that the mineral composition, structure and uniformity of the sinter are main factors influencing the soft melting performance through the analysis of the process of the soft melting of the sinter; the influence of the chemical composition of the sinter on the metallurgical performance of the sinter, the soft melting performance of lump ore, pellet ore and sinter are tested, and the influence of the variety and the ore blending structure of the iron ore on the soft melting performance of the sinter is not researched.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a blending structure for improving the soft melting performance of the sintering ore, which can comprehensively utilize wastes, reduce the pollution to the environment, improve the initial softening temperature of sintering by 20-30 ℃, reduce the temperature in a soft melting region by 30-40 ℃ so as to reach the temperature within 110 ℃, reduce the thickness of a soft melting zone during the smelting of the sintering ore produced by the blending structure in a blast furnace, improve the air permeability and improve the production efficiency.

The measures for realizing the aim are as follows:

a blending ore blending structure for improving the softening and melting properties of sintered ore comprises the following raw materials in percentage by weight: limonite: 40-55%, dense hematite: 10-15%, other hematite 15-40%, and specularite: not more than 10%, waste: 0 to 5 percent.

Preferably: the weight percentage content of specularite is not more than 8%.

Preferably: the weight percentage content of the waste material is not more than 3.5 percent.

It is characterized in that: the waste material is gas ash, dust-removing ash, iron-making or steel-making or sintering iron-containing sundries.

Mechanism and action of each raw material in the invention

Limonite: the method is used for producing a proper amount of liquid phase and sintering speed in the sintering process, can complement the specularite, promotes the uniform distribution of the specularite in the sintered ore, and simultaneously avoids the excessively high liquid phase generation speed, thereby improving the uniformity of the sintered ore. The limonite proportion is less than 40 percent, the liquidity of the liquid phase is insufficient, the proportion is more than 55 percent, the liquid phase is generated at too high speed, and the uniformity of the sinter is influenced.

The dense hematite is hematite powder ore (such as south Africa powder) with uniform granularity and composition and dense structure, plays a supporting role in the process of sintering ore forming, improves the air permeability in the sintering process, promotes the flow of liquid phase and improves the uniformity of the sintering ore. The proportion of the dense hematite is less than 10 percent, and the supporting effect is not obvious; the proportion of the compact hematite is more than 15 percent, and the assimilation speed is slow, so that the uniformity of the sinter is influenced.

Other hematites: and participating in the sintering process.

Specularite: the blending of the limonite and the specularite can be complemented, so that the uniform distribution of the limonite in the sinter is promoted, and the excessive high liquid phase generation speed is avoided, thereby improving the uniformity of the sinter. Specularite is more than 10%, and the liquid phase flow is inhibited, so that the uniformity of the sinter is influenced.

Waste materials: participate in the sintering process, and avoid the influence on the uniformity of the sintering ore due to overlarge proportion.

Compared with the prior art, the invention has the advantages that: not only can comprehensively utilize the wastes and reduce the pollution to the environment, but also can increase the initial softening temperature of sintering by 20-30 ℃ and reduce the temperature in the softening and melting region by 30-40 ℃, thereby reaching the temperature within 110 ℃.

Detailed Description

The present invention is described in detail below:

example 1

A blending ore blending structure for improving the softening and melting properties of sintered ore comprises the following raw materials in percentage by weight: limonite: 46%, dense hematite: 13%, other hematites: 36, specularite: 5%, waste material: 0 percent.

The preparation process is carried out according to the prior art.

Through detection and trial, the initial softening temperature of the sinter is 1235 ℃, the final softening temperature is 1340 ℃, and the softening interval is 105 ℃.

Example 2

A blending ore blending structure for improving the softening and melting properties of sintered ore comprises the following raw materials in percentage by weight: limonite: 49%, dense hematite: 13%, other hematites: 25, specularite: 8%, waste material: 5 percent.

The preparation process is carried out according to the prior art.

Through detection and trial, the initial softening temperature of the sinter is 1230 ℃, the final softening temperature is 1319 ℃, and the softening interval is 89 ℃.

Example 3

A blending ore blending structure for improving the softening and melting properties of sintered ore comprises the following raw materials in percentage by weight: limonite: 52%, dense hematite: 13%, other hematites: 29, specularite: 5%, waste material: 1 percent.

The preparation process is carried out according to the prior art.

Through detection and trial, the initial softening temperature of the sinter is 1221 ℃, the final softening temperature is 1312 ℃, and the softening interval is 91 ℃.

Example 4

A blending ore blending structure for improving the softening and melting properties of sintered ore comprises the following raw materials in percentage by weight: limonite: 53%, dense hematite: 10%, other hematite: 25, specularite: 7%, waste material: 5 percent.

The preparation process is carried out according to the prior art.

Through detection and trial, the initial softening temperature of the sinter is 1232 ℃, the final softening temperature is 1321 ℃, and the softening interval is 89 ℃.

Example 5

A blending ore blending structure for improving the softening and melting properties of sintered ore comprises the following raw materials in percentage by weight: limonite: 55%, dense hematite: 10%, other hematite: 24%, specularite: 7%, waste material: 4 percent.

The preparation process is carried out according to the prior art.

Through detection and trial, the initial softening temperature of the sinter is 1243 ℃, the final softening temperature is 1325 ℃, and the softening interval is 82 ℃.

The above examples are merely preferred examples and are not intended to limit the embodiments of the present invention.