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Slag making recarburized ball and its production method

A carbon ball and slag-making technology, which is applied in electric furnaces, furnaces, furnace types, etc., can solve problems such as high power consumption, long exposure time of electrode arc light leakage, and overoxidation of molten steel, so as to achieve obvious social and economic benefits and prevent arc erosion of furnaces Wall, the effect of preventing the inhalation of nitrogen

Inactive Publication Date: 2008-06-04
天津新技术产业园区津良科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many ways to realize foaming slag. The use of carbon oxygen gun manipulator can achieve better results, but the price is expensive and the cost is high.
At present, the foaming slag process commonly used in steelworks is carried out by blowing coal powder and oxygen from the carbon blowing lance and oxygen blowing lance installed on the furnace door. However, due to the tension on the slag surface and the slagging agent The particle size of the pulverized coal used is less than 3mm, which is very light, and the furnace is operated under negative pressure, so about 30% of the pulverized coal is sucked by the dust removal hole during the pulverized coal blowing process, and the rest falls on the slag surface , the furnace door pulverized coal injection loss is large, it is difficult to blow into the slag layer, resulting in difficult foaming, not in time, so that the electrode arc exposure time is too long, so it is easy to cause erosion of the furnace wall of the electric furnace and heat energy dispersion , the power consumption is too high, and at the same time, the contact between molten steel and air cannot be blocked due to poor foam slag, which increases the nitrogen content of molten steel and affects the quality of steel; in addition, in the smelting of high carbon steel, there is currently a decarburization speed at the end of smelting Fast, the peroxidation of molten steel affects the carbon content of the steel, resulting in a decline in performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Source of raw materials

[0022] The raw materials for slag making and carbon adding balls are all commercially available products. The coal with activity ≥ 68% is purchased from the gasification coal produced by Shanxi Shuozhou Coal Mine, and the sodium hydroxide is industrial 95% pure hydrogen produced by Dagu Chemical Plant. Sodium, industrial starch can be purchased directly from the market.

[0023] 2) The content of each component in the slag-forming and carbon-enhancing ball ingredients is calculated in parts by weight,

[0024] As shown in Table 1: Coal with activity ≥ 68% 95, sodium hydroxide 1, industrial starch 2, water 2; here the activity of coal is an indicator of the ability of coal to escape gas during combustion, the higher the activity , the more gas escapes.

[0025] 3) The manufacturing steps are as follows:

[0026] (1) Primary crushing: Use a pulverizer to crush the coal with an activity ≥ 68% into crushed coal with a particle size of 10mm; (...

Embodiment 2

[0028] 1) raw material source is with embodiment 1;

[0029] 2) The content of each component of the ingredients for slagging and increasing carbon balls is calculated in parts by weight, as shown in Table 1: coal 96 with an activity degree ≥ 68%, sodium hydroxide 0.8, industrial starch 1.7, and water 1.5;

[0030] 3) The manufacturing steps are the same as in Example 1.

[0031] Table 1 shows the test results of its main performance indicators. It can be seen that the specific weight of its stack is as high as 1.642t / M 3 , the compressive strength is as high as 60Kg / piece, and the carbon content is as high as 85%.

[0032] Table 1

[0033] 1 Content of each component (parts by weight)

[0034] When scrap steel is smelted in an electric arc furnace, the above-mentioned slag-forming carbon-increasing balls are added to the steelmaking furnace at a certain speed from the high-level bunker on the furnace top instead of coal powder, and oxygen is blown through the furn...

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Abstract

The invention relates to an arc furnace steel-smelting used foamed slag forming constituents, especially to a slag atomised ball and it's making method. It is characterized in that it is a mixture which is formed by (by weight ratio) coal 95-96% with the activity degree >=68%, the industrial flour 1.5-2%, the caustic soda 0.8-1% and the water 1-2%; The method comprises the following steps: primary breaking, finely-dividing, primary kneading, secondary kneading, air ballasting, extrusion molding, drying and sieving.

Description

technical field [0001] The invention relates to a foam slag-forming agent for electric arc furnace steelmaking, in particular to a slag-forming carbon-increasing ball and a manufacturing method thereof. Background technique [0002] In the slag making process of electric arc furnace steelmaking, the foam slag process is widely used at present. The foam slag is formed by burning carbon in oxygen to generate carbon monoxide and carbon dioxide gas and filling them into the slag floating on the surface. In the process of steelmaking with scrap steel, the foam slag layer keeps the huge heat energy generated by the arc inside the scrap steel and molten steel, which plays a role of heat preservation and speeds up the smelting process. At the same time, isolating the arc from the furnace wall can prevent the arc from eroding the furnace wall. It can also block the contact between molten steel and the air in the furnace, reduce the inhalation of nitrogen and improve the quality of st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/54C22B1/14
Inventor 钱自良
Owner 天津新技术产业园区津良科技有限公司