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Iron ore pellet additive and preparation thereof

A technology of additives and pellets, which is applied in the field of metallurgy, can solve the problems affecting the energy consumption and output of blast furnace ironmaking, the high pulverization rate of green pellets, and the slow drying speed. high effect

Inactive Publication Date: 2009-07-01
刘贵堂 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main component of bentonite is SiO 2 and AL 2 o 3 , for every 1% of bentonite added, the iron grade of pellets will drop by 0.6%. The average percentage of bentonite added to pellets in my country is about 3-5%, and most of them have high pulverization rate of green pellets. , slow drying speed, low strength, high rate of return ore, lower grade and other phenomena, which seriously affect the energy consumption and output of blast furnace ironmaking

Method used

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  • Iron ore pellet additive and preparation thereof

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Effect test

Embodiment 1

[0021] Embodiment 1 Preparation of Iron Ore Pellet Additive

[0022] (1) Take each component by the following weight (unit: Kg): bentonite 90, industrial sodium carbonate 3, superfine building material high-efficiency additive (according to the authorized announcement number: the disclosed method of CN 1268574C prepares the ultrafine building material high-efficiency additive )1;

[0023] (2) After mixing the above components together, add water to make the mixture into a paste or porridge, stir evenly, let it stand for 3-6 days, dry, and use a high-pressure jet mill (manufactured by Qingdao Micron Powder Technology Equipment Co., Ltd.) , whose model is MQL) is crushed into 1200-1500 mesh particles, that is, too.

Embodiment 2

[0024] Embodiment 2 Preparation of Iron Ore Pellet Additive

[0025] (1) Take each component (unit: Kg) by the following weight: bentonite 110, sodium hydroxide 5 for industrial use and ultrafine building material high-efficiency additive (according to the method disclosed by the authorized announcement number: CN 1268574C to prepare the ultrafine building material high-efficiency Additive) 4;

[0026] (2) After mixing the above components together, add water to make the mixture into a paste or porridge, stir evenly, let it stand for 3-6 days, dry, and use a high-pressure jet mill (manufactured by Qingdao Micron Powder Technology Equipment Co., Ltd.) , whose model is MQL) is crushed into 1200-1500 mesh particles, that is, too.

Embodiment 3

[0027] Embodiment 3 Preparation of Iron Ore Pellet Additive

[0028] (1) Take each component by the following weight (unit: Kg): bentonite 100, industrial sodium hydroxide 4, cellulose ether 3;

[0029] (2) After mixing the above components together, add water to make the mixture into a paste or porridge, stir evenly, let it stand for 3-6 days, dry, and use a high-pressure jet mill (manufactured by Qingdao Micron Powder Technology Equipment Co., Ltd.) , whose model is MQL) is crushed into 1200-1500 mesh particles, that is, too.

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Abstract

The invention discloses an iron ore pellet additive and a preparation method thereof. The iron ore pellet additive consists of constituents by the following weight portion: 90 to 110 portions of bentonite, 3 to 5 portions of industrial alkali, and 1 to 4 portions of cellulose ether or ultramicro building material high-efficiency additives; and the constituents are mixed together, added with water to form paste or porridge, stirred evenly, placed for 3 to 6 days, dried, and crushed into particles with 1200-1500 meshes to obtain the iron ore pellet additive. An iron ore pellet obtained by wrapping the iron ore pellet additive has reduced burst, can reach more than 3000N, does not produce cracks after falling for 10 times, and greatly reduces silicon content; a furnace casting experiment proves that the iron ore pellet can not explode when entering a furnace at a temperature of 1200 DEG C, and can remarkably improve the tapping rate; compared with the prior additive which is simply the bentonite, the additive has the characteristics of strong adhesion force, high pelletization degree, short roasting time, good roasting performance, improved grade of pellet ore, energy consumption reduction, and so on.

Description

technical field [0001] The invention relates to a metallurgical material, in particular to a high-temperature iron oxide ore pellet additive for ironmaking and a preparation method thereof, belonging to the field of metallurgy. Background technique [0002] Sintered pellet binder is a key auxiliary raw material for the production of pellets in the iron and steel industry, and its performance is directly related to the quality of the pellets. For a long time, domestic and foreign sintering plants have used bentonite as a binder to make pellets. Bentonite is a commonly used binder in traditional pellet additives. Bentonite can improve the drop strength and compressive strength of green pellets. In addition, It can also increase the bursting temperature of green balls during drying. The main component of bentonite is SiO 2 and AL 2 o 3 , for every 1% of bentonite added, the iron grade of pellets will drop by 0.6%. The average percentage of bentonite added to pellets in my c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243
Inventor 刘贵堂李长顺温燕明
Owner 刘贵堂
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