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Additive for improving sinter reducibility, high-reducibility sinter and preparation method thereof

A technology for sintering ore and additives, applied in the field of iron and steel metallurgy sintering, can solve problems such as complex operation, and achieve the effects of simple process, strong operability, and solving complex operation.

Inactive Publication Date: 2019-11-29
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an additive for improving the reducibility of sinter, high reducibility sinter and its preparation method, so as to solve the problem of complex operation in the existing process

Method used

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  • Additive for improving sinter reducibility, high-reducibility sinter and preparation method thereof

Examples

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preparation example Construction

[0025] The preparation of highly reducing sintered ore of the present invention comprises the following steps:

[0026] 1. Preparation of additives to improve the reducibility of sinter

[0027] Boron-containing compounds, hydrogen peroxide (H 2 o 2 ), permanganate and water are uniformly mixed to obtain the additive; wherein, in terms of mass percentage, the additive contains 0.05% to 5% of boron compounds, 0.1% to 10% of hydrogen peroxide (H 2 o 2 ), 0.03% to 3% permanganate, and the rest is water. The boron-containing compound is potassium tetraborate (K 2 B 4 o 7 ·5H 2 O) and sodium tetraborate (Na 2 B 4 o 7 10H 2 O) one or a mixture of two. Permanganate is potassium permanganate (KMnO 4 ) and sodium permanganate (NaMnO 4 ) or a mixture of both.

[0028] 2. Break the ordinary sinter obtained by sintering (ie the sinter described in the present invention), spray the above-mentioned additive on the surface of the sinter at 400-600°C, and when the additive full...

Embodiment 1

[0044] The preparation steps of the highly reducing sintered ore in this embodiment are:

[0045] 1) prepare additive, in this additive, by mass percent, comprise 0.05% potassium tetraborate, 0.1% hydrogen peroxide, 0.03% potassium permanganate, and the water of remaining weight, potassium tetraborate, hydrogen peroxide, Mix potassium permanganate and water evenly.

[0046] 2) After the experimental raw materials obtained by sintering are crushed, they are cooled in a ring cooler, and the middle diameter speed of the trolley is reduced to 0.6m / min. When the surface temperature of the sintered ore reaches 400°C, the additive is sprayed on the surface of the sintered ore, 0.5kg of the additive is sprayed per ton of sintered ore, and the highly reducing sintered ore is obtained after cooling to room temperature.

Embodiment 2

[0048] The preparation steps of the highly reducing sintered ore in this embodiment are:

[0049] 1) prepare additive, in this additive, by mass percent, comprise 0.25% potassium tetraborate, 0.5% hydrogen peroxide, 0.15% potassium permanganate, and the water of remaining weight, potassium tetraborate, hydrogen peroxide, Mix potassium permanganate and water evenly.

[0050] 2) After crushing the experimental raw materials obtained by sintering, cool them in the ring cooler, reduce the speed of the middle diameter of the trolley to 0.5m / min, and adjust the blast volume of the first two stages of the ring cooler to be 1.25 times of the conventional blast volume. When the surface temperature of the sintered ore reaches 450°C, the additive is sprayed on the surface of the sintered ore, and 1.0kg of the additive is sprayed per ton of sintered ore, and the sintered ore with high reducing property is obtained after cooling to room temperature.

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Abstract

The invention belongs to the technical field of steel metallurgy sintering and discloses an additive for improving sinter reducibility, high-reducibility sinter and a preparation method thereof. The additive for improving sinter reducibility is made by mixing a boron-containing compound, hydrogen peroxide, permanganate and water, wherein the contents of the boron-containing compound, hydrogen peroxide and the permanganate are, by mass percent, 0.05%-5%, 0.1%-10% and 0.03%-3% correspondingly, and the balance is water. The method for preparing the high-reducibility sinter comprises the steps that common sinter obtained through sintering is broken and is then cooled in a ring cold machine, the trolley pitch diameter speed is lowered, the blast volume is adjusted, and when the surface temperature of the sinter reaches 400 DEG C-600 DEG C, the additive is sprayed on the surface. Through the additive and the method, other properties are not influenced while the sinter reducibility can be improved effectively, and the foundation is laid for blast furnace intensified smelting.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy sintering, and mainly relates to an additive for improving the reducibility of sintered ore, high-reducible sintered ore and a preparation method thereof. Background technique [0002] As the most important iron-containing charge of blast furnace, sinter's reducibility has an important influence on the operation and consumption of blast furnace. Reducibility refers to the difficulty of oxygen combined with iron in iron ore being captured by gas reducing agent, that is, the difficulty of indirect reduction. When sinter with poor reducibility is loaded into the blast furnace, it will first affect the utilization rate of gas in the upper block zone of the blast furnace, resulting in a decrease in indirect reduction and an increase in direct reduction in the upper part of the blast furnace, affecting the fuel ratio and output of the blast furnace. A 10% change in the direct reductio...

Claims

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Application Information

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IPC IPC(8): C22B1/16C22B1/26
CPCC22B1/16C22B1/26
Inventor 巨建涛唐琛妹庞焯刚邢相栋棘广恒安家良
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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