A kind of high-efficiency composite bentonite for pelletizing

A bentonite and high-efficiency technology, applied in the field of high-efficiency composite bentonite for pellets, can solve the problems of reduced iron content in pellets, impact on blast furnace output and coke ratio, and reduced reducibility of pellets. Metallurgical properties, strong bonding effect

Active Publication Date: 2018-04-03
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main component of bentonite is SiO 2 , and Al 2 o 3 , adding a large amount will reduce the iron grade of the pellets, affect the output and coke ratio of the blast furnace, and increase the amount of blast furnace slag
In addition, due to the high melting point of bentonite, the roasting of oxidized pellets requires a higher roasting temperature, which requires high equipment requirements, and when the pellets are roasted, a connecting bridge will be formed between the iron oxide particles, blocking the passage into the internal void. , leading to a decrease in the reducibility of the pellets and an increase in energy consumption during smelting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment provides a high-efficiency composite bentonite for pellets, which is composed of the following components in parts by weight: 60 parts of bentonite, 25 parts of organic cellulose, 10 parts of sodium carbonate, 12 parts of magnesium oxide, 4 parts of boron trioxide, 11 parts of high temperature explosion-proof agent.

[0028] The main chemical component in bentonite is: SiO 2 52%, Al 2 O 3 14.7%, CaO 1.45%, MgO2.41%.

[0029] The compound bentonite is mixed into the iron ore in the proportion of 1.1:100 parts by weight. In the iron concentrate, the bow magnetic concentrate accounts for 70%, and the bow float concentrate accounts for 30%. After pelletizing by the disc pelletizer, the test The drop strength of the green ball was measured 7 times, the compressive strength was 14 Newtons, and the burst temperature was greater than 450°C.

Embodiment 2

[0031] This embodiment provides a high-efficiency composite bentonite for pellets, which is composed of the following components in parts by weight: 80 parts of bentonite, 15 parts of organic cellulose, 7 parts of sodium carbonate, 12 parts of magnesium oxide, 5 parts of boron trioxide, 8 parts of high temperature explosion-proof agent.

[0032] The main chemical component in bentonite is: SiO 2 55%, Al 2 O 3 14%, CaO 1.5%, MgO 2.4%.

[0033] The compound bentonite is mixed into the iron ore in the proportion of 1.1:100 parts by weight. In the iron concentrate, the bow magnetic concentrate accounts for 70%, and the bow float concentrate accounts for 30%. After pelletizing by the disc pelletizer, the test The measured green ball drop strength was 7.5 times, the compressive strength was 13.8 Newton, and the burst temperature was greater than 500°C.

Embodiment 3

[0035] This embodiment provides a high-efficiency composite bentonite for pellets, which is composed of the following components in parts by weight: 80 parts of bentonite, 20 parts of organic cellulose, 10 parts of sodium carbonate, 14 parts of magnesium oxide, 5 parts of boron trioxide, 5 parts of high temperature explosion-proof agent.

[0036] The main chemical component in bentonite is: SiO 2 62%, Al 2 O 3 12.3%, CaO 1.55%, MgO2.4%.

[0037] The compound bentonite is mixed into the iron ore in the proportion of 1.1:100 parts by weight. In the iron concentrate, the bow magnetic concentrate accounts for 70%, and the bow float concentrate accounts for 30%. After pelletizing by the disc pelletizer, the test The measured green ball drop strength was 6.8 times, the compressive strength was 15 Newtons, and the burst temperature was greater than 450°C.

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Abstract

The invention relates to a high-efficiency composite bentonite for pellets, which consists of the following components in parts by weight: 60-80 parts of bentonite, 12-26 parts of organic cellulose, 5-10 parts of sodium carbonate, 7-14 parts of magnesium oxide, three 4-6 parts of diboron oxide, 5-11 parts of high-temperature explosion-proof agent. The organic cellulose is one or any mixture of carboxymethyl cellulose and hydroxymethyl cellulose. The high temperature anti-explosion agent is an anti-explosion fiber. Compared with the prior art, the beneficial effects of the present invention are: 1) instead of ordinary bentonite, the amount of bentonite binder is reduced from 1.7% to 1.2%; 2) compared with ordinary bentonite, it has the It has the characteristics of high strength and high pelletizing degree, which can increase the grade of finished ore (TFe) by about 0.6%, and reduce the content of SiO2 by about 0.8%; 3) adding magnesium oxide and boron trioxide can effectively reduce the roasting temperature; 4) can reduce the unit consumption , improve the ball forming of green balls, increase the burst temperature of green balls, and improve the metallurgical properties of pellets.

Description

Technical field [0001] The invention relates to the technical field of steel smelting pellet production, in particular to a high-efficiency composite bentonite for pellets. Background technique [0002] Bentonite for metallurgical pellets is a binder for iron ore pellets. Bentonite has strong cohesiveness and high temperature stability. Add 1-2% of bentonite to iron ore concentrate, and dry it into pellets after granulation. It can greatly increase the production capacity of blast furnaces and has been widely adopted by steel plants. [0003] Bentonite for metallurgical pellets is a kind of bentonite, which is also called bentonite or bentonite. Bentonite is a water-bearing clay mineral mainly composed of montmorillonite due to its special properties. Such as: swelling, adhesiveness, adsorption, catalysis, thixotropy, suspension and cation exchange, etc., so it is widely used in various industrial fields as "universal clay". In the metallurgy industry, bentonite is also widely u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242
Inventor 孙俊波刘天明韩子文王丽晖李黎明
Owner ANGANG STEEL CO LTD
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