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Red mud composite binder for oxidized pellets

A technology of oxidizing pellets and binders, which is applied in the fields of chemical industry and metallurgy, can solve the problems of increasing blast furnace slag, reducing the TFe content of sintered ore, and reducing blast furnace productivity, etc., to achieve increased productivity, high iron content, and blast furnace slag content Reduced effect

Inactive Publication Date: 2013-01-02
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 3. The TFe content of pellets and sinters is reduced, which in turn reduces the productivity of the blast furnace;
[0007] 4. The addition of bentonite and CaO-containing substances will increase the amount of blast furnace slag. For every 1kg of calcium-based bentonite, the amount of blast furnace slag will increase by 2.89kg.

Method used

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  • Red mud composite binder for oxidized pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Composition: TFe 37.6%, Al 2 o 3 11.56%, SiO 2 The red mud with 4.27%, CaO 0.46%, and MgO 0.44% is dried with a grate machine (200°C), crushed by a ball mill, and sieved by a rotary vibrating sieve to obtain 95% of the red mud powder with a particle size of less than 200 mesh; the composition is TFe 0.7%, SiO 2 6.2%, CaO 1.4%, MgO 70.2% light-burned brucite is crushed with a ball mill, and sieved by a rotary vibrating sieve to obtain 95% of light-burned brucite powder with a particle size of less than 200 mesh; red mud powder, light-burned brucite Stone powder and humic binder (sodium humate) are mixed according to the mass percentage of 82:8:10, and the red mud composite binder is composed of TFe 31.02%, Al 2 o 3 9.54%, SiO 2 3.99%, CaO 0.49%, MgO 5.63%. After the red mud composite binder is used in the production of oxidized pellets, compared with calcium-based bentonite, the TFe of the pellets is increased by 0.87% based on the daily ratio of 3%, and 9.99k...

Embodiment 2

[0033] Composition: TFe 37.6%, Al 2 o 3 11.56%, SiO 2 The red mud with 4.27%, CaO 0.46%, and MgO 0.44% is dried with a grate machine (400°C), crushed by a ball mill, and sieved by a rotary vibrating sieve to obtain 95% of the red mud powder with a particle size of less than 200 mesh; the composition is SiO 2 3.9%, CaO 29.43%, MgO 19.32% light burnt dolomite is crushed with Raymond Mill, and after rotary vibration sieve screening, 95% of light burnt dolomite powder with particle size less than 200 mesh is obtained; red mud powder, light burnt dolomite powder Mix with humic binder (sodium humate) according to mass percentage 68:22:10, the obtained red mud composite binder composition is TFe 25.38%, Al 2 o 3 7.80%, SiO 2 3.76%, CaO6.93%, MgO4.64%. After the red mud composite binder is used in the production of oxidized pellets, compared with calcium-based bentonite, the TFe of the pellets is increased by 0.71% based on the daily ratio of 3%, 10.43kg of quicklime can be ...

example 3

[0035] Composition: TFe 37.6%, Al 2 o 3 11.56%, SiO 2 The red mud with 4.27%, CaO 0.46%, and MgO 0.44% is dried with a grate machine (350°C), crushed by a ball mill, and sieved by a rotary vibrating sieve to obtain 95% of the red mud powder with a particle size of less than 200 mesh; the composition is TFe 0.7%, SiO 26.2%, CaO 1.4%, MgO 70.2% light-burned brucite is crushed with a ball mill, and sieved by a rotary vibrating sieve to obtain 95% of light-burned brucite powder with a particle size of less than 200 mesh; red mud powder, light-burned brucite Stone powder and humic binder (potassium humate) are mixed according to the mass percentage of 82:8:10, and the obtained red mud composite binder is composed of TFe 31.02%, Al 2 o 3 9.54%, SiO 2 3.99%, CaO 0.49%, MgO 5.63%. In the production of oxidized pellets, calcium-based bentonite and red mud composite binders are mixed with 1.5% respectively, the TFe of the pellets can be increased by 0.44%, the use of quicklime...

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Abstract

The invention discloses red mud composite binder for oxidized pellets. The red mud composite binder is prepared by waste red mud of aluminum plants, magnesite stone and humus binder. The red mud composite binder has characteristics of good hydrophily, excellent binding effect, low price, high iron content and the like. The granularity of the red mud composite binder is smaller than 200 meshes, partial weight ratio is larger than or equal to 90%, and water content is smaller than or equal to 1%. Therefore, the red mud composite binder can partially or totally replace bentonite to be used for producing the oxidized pellets. Compared with the technology completely utilizing the bentonite to produce the oxidized pellets, production rates of pellet TFe, sinter TFe and an ironmaking system are all improved, and slag quantity of a blast furnace is reduced. Besides, the content of MgO in the pellets is increased, so that the thermodynamic property of the pellets is good, and operation of the blast furnace is facilitated.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and metallurgy industry, and in particular relates to a red mud composite binder for oxidation pellets. Background technique [0002] With the development of the iron and steel industry, the amount of raw materials required for ironmaking is increasing. During smelting, in order to improve the efficiency of smelting and the quality of iron, the ore needs to be finely ground and selected to make pellets before being put into the furnace. The binder is an indispensable and important component for making iron concentrate powder into pellets. It should have good ball forming properties. Good low temperature strength and high temperature strength, good expansion coefficient, reduction degree, reflow temperature and other properties. At present, the binders that have been used mainly include inorganic binders, such as bentonite, water glass, slaked lime, cement, sticky lime, etc.; organic bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242
Inventor 李建云曾晖王金洪杜春峰梁栋王学斌
Owner LAIWU IRON & STEEL GRP
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