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Binder for alkaline pellets and preparation method of binder

A technology of alkaline pellets and binders, applied in the field of iron and steel metallurgy, can solve problems such as accidents, increased slag volume, and deterioration of blast furnaces, and achieve the effects of reducing material consumption, reducing coke ratio, and reducing slag volume

Pending Publication Date: 2020-12-25
河南钰镁新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxidized pellets using bentonite have the disadvantage that they can only produce acidic or semi-alkaline pellets (because of high alkalinity, the pellets will burst and pulverize seriously during the roasting production process, resulting in the production of pellets. Shaft furnace or grate rotary kiln equipment operation is not smooth or accident)
In addition, Al in bentonite 2 o 3 The composition not only increases the amount of slag during blast furnace ironmaking, but also has the disadvantage of deteriorating the performance of blast furnace primary slag (such as making the slag sticky). The actual requirements of the equipment, and the main components of this material are CaO and MgO and other components that are beneficial to blast furnace slagging. Positive significance in terms of economy, ecology and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Use light-burned dolomite, quicklime, and silica fume as raw materials to make a non-bentonite binder, wherein the particle size of light-burned dolomite and quicklime is an ash block not greater than 36 mm; silica fume is a powder with a particle size of less than 1000 mesh Material, 62% CaO plus MgO in bentonite-free binder, SiO in bentonite-free binder 2 The content is 12%, no Al in bentonite binder 2 o 3 The content is 2.0%, and the fineness without bentonite binder is 0.045mm. The silica fume in this example is the dedusting ash during metal silicon smelting.

[0021] Step 1: mixing quicklime and light-burned dolomite in a ratio of 60:40 to make an alkaline cementitious material;

[0022] Step 2: The alkaline gelling material is then processed into a powder with a particle size not greater than 5mm through a double-roller crusher;

[0023] Step 3: Mix the powder and silica fume with a particle size not greater than 5mm in a ratio of 85:15 through a...

Embodiment 2

[0028] Embodiment 2: Use quicklime, light-burned magnesia, and silica fume as raw materials to make a bentonite-free binder, wherein the particle size of quicklime and light-burned magnesia is ash block not greater than 36mm; silica fume is a powder with a particle size less than 1200 mesh Body material, the sum of CaO and MgO content in the bentonite binder is 65%, and there is no SiO in the bentonite binder 2 The content is 10%, no Al in bentonite binder 2 o 3 The content is 1.8%, and the fineness without bentonite binder is 400 mesh. The silica fume in this example is the dedusting ash during ferrosilicon alloy smelting.

[0029] Step 1: mixing quicklime and light-burned magnesia in a ratio of 80:20 to make an alkaline cementitious material;

[0030] Step 2: The alkaline gelling material is then processed into a powder with a particle size not greater than 5mm through a double-roller crusher;

[0031] Step 3: Mix the powder and silica fume with a particle size not greate...

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Abstract

The invention provides a binder for alkaline pellets and a preparation method of the binder. The binder is a bentonite-free binder prepared by mixing and homogenizing an alkaline cementing material and an acidic powder material, wherein the total content of CaO and MgO in the bentonite-free binder is not less than 65%, the content of SiO2 is not more than 20%, the content of Al2O3 is not more than3.0%, and the particle size of the bentonite-free binder is not more than 0.045 mm. The binder provided by the invention has the main components (CaO, MgO and the like), is useful and beneficial to slagging of a blast furnace, is free of bentonite, and has a green pellet strength and a burst temperature that meet the actual requirements of the existing processing equipment. The binder provided bythe invention has positive significance in the aspects of saving bentonite resources, reducing material consumption of iron making and slagging of a blast furnace, reducing the amount of slag, reducing the coke ratio, and being extremely economic, ecological, environmentally friendly and the like.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a binder for alkaline pellets and a preparation method thereof. Background technique [0002] At present, when the existing magnetite is used to produce oxidized pellets for blast furnaces, almost all of them use bentonite as a binder for pelletizing and improving the drying process. Good ball strength, high burst temperature and other indicators. However, the oxidized pellets using bentonite have the disadvantage that they can only produce acidic or semi-alkaline pellets (because of high alkalinity, the pellets will burst and pulverize seriously during the roasting production process, resulting in the production of pellets. Shaft furnace or grate rotary kiln equipment operation is not smooth or accident). In addition, Al in bentonite 2 o 3 The composition not only increases the amount of slag during blast furnace ironmaking, but also has the dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243
CPCC22B1/243Y02P10/20
Inventor 王振峰
Owner 河南钰镁新材料科技有限公司
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