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Boron-magnesium compound agglomerate surface additive

A surface additive and composite surface technology, which is applied in the field of blast furnace ironmaking additives, can solve problems such as increased chlorine content, high low-temperature pulverization rate of sintered ore, and adverse environmental effects, so as to reduce low-temperature pulverization rate, reduce severe corrosion, The effect of production cost reduction

Inactive Publication Date: 2004-09-15
孙挺 +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ironmaking with sintered ore is beneficial to improve the quality of blast furnace ironmaking, but the low-temperature pulverization rate of sintered ore in blast furnace ironmaking is high, which affects the air permeability of blast furnace
To solve this problem, the method of adding calcium chloride on the surface of sinter is usually adopted. Adding calcium chloride can obviously reduce the low-temperature pulverization rate of sinter, but the use of calcium chloride increases the chlorine content in the blast furnace gas. Accelerated gas recovery, corrosion of metal materials in cooling units, and negative impact on the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0007] Example 1. choose the magnesium chloride that purity is greater than 95% and the boric acid that purity is greater than 98% as raw material, evenly mix, be mixed with water and be mixed with the solution type composite additive, its weight proportion is: boric acid 0.15%, magnesium chloride 1.0%, all the other are water. Spray the prepared composite surface additive solution on the surface of the sintered ore, and measure the low-temperature pulverization rate. Below, the sintered ore that does not add additive, adds calcium chloride additive and adds composite additive of the present invention, according to national standard GB / T13242-91 carries out iron ore low-temperature pulverization rate test respectively, and the result is: no additive > 35.0 , adding calcium chloride is 22.5, and adding the composite additive of the present invention is 21.9.

example 2

[0008] Example 2. The selected raw materials and preparation method are the same as example 1, and the weight proportion of composite additives is: boric acid 0.05%, magnesium chloride 0.8%, and all the other are water. Apply and test according to the method of Example 1, the results of the tested low-temperature pulverization rate are: no additives>35.0, adding calcium chloride is 22.5, and adding the composite additive of the present invention is 22.8.

example 3

[0009] Example 3. The selected raw materials and preparation method are the same as example 1, and the weight proportion of composite additives is: boric acid 0.3%, magnesium chloride is 2.0%, and all the other are water. Apply and test according to the method of Example 1, the results of the tested low-temperature pulverization rate are: no additives>35.0, adding calcium chloride is 22.5, and adding the composite additive of the present invention is 19.4.

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PUM

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Abstract

The invention refers to a kind of boron, calcium and magnesium compound sintering ore surface additives for high furnace puddling, it can be liquid or powder, the liquid one is made up of Boracic acid, magnesium chloride, and water, the proportion is: boracic acid 0.05-0.3%, magnetism chloride 0.5-3.0%, the residue is water; the proportion of powder is: boracic acid: magnetism chloride=0.04-0.3:1, the additives are sprayed onto the surface of sintering ore when in using, it can reduce the blooming rate in the furnace effectively, it can replace the single calcium additives. It can reduce the content of chloride above 1 / 2. It reduces the production cost.

Description

technical field [0001] The invention relates to an additive for blast furnace ironmaking, in particular to a composite additive for the surface of boron and magnesium sintered ore used for blast furnace ironmaking. Background technique [0002] Ironmaking with sintered ore is beneficial to improve the quality of blast furnace ironmaking, but the high pulverization rate of sintered ore in blast furnace ironmaking at low temperature affects the air permeability of blast furnace. To solve this problem, the method of adding calcium chloride on the surface of sinter is usually adopted. Adding calcium chloride can obviously reduce the low-temperature pulverization rate of sinter, but the use of calcium chloride increases the chlorine content in the blast furnace gas. Accelerated gas recovery, corrosion of metal materials in cooling devices, and adverse effects on the environment at the same time. Contents of the invention [0003] The purpose of the present invention is to prov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/14
CPCY02P10/20
Inventor 孙挺邢敏华郝德胜于桂兰
Owner 孙挺
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