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Fluorine-free sodium-free ladle covering agent

A ladle covering agent and covering agent technology, which is applied in the field of steel smelting and ladle metallurgy, can solve the problems of poor application effect of covering agent, low desulfurization ability, slow melting speed, etc. strong effect

Inactive Publication Date: 2014-02-12
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to invent a fluorine-free and sodium-free ladle covering agent, which has the characteristics of strong alkalinity, reducibility, strong absorption of inclusions, excellent spreadability and heat preservation performance, and solves the problem of current CaO-based ladle covering. The problem of high melting point, slow melting speed, low desulfurization ability, and poor application effect of covering agent exists in the agent, and the problem of pollution hazard caused by the use of sodium oxide and calcium fluoride in the covering agent is overcome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Using spodumene, lime, magnesia, and carbon black as raw materials, spodumene, lime, and magnesia are dried at 200°C, according to 40% of spodumene, 40% of lime, 10% of magnesia, and 10% of carbon black The batching, batching and preparation process are as follows: weigh spodumene, lime and magnesia according to weight parts, mix well and pre-melt at 1300-1400°C, cool with natural wind after melting, break after cooling, and then Made into fine powder, mixed with carbon black according to parts by weight, mixed evenly and ground to 200 mesh (particle size less than 0.074mm), after pulping, dried in a low-pressure spray granulation tower to form a hollow particle covering agent, moisture-proof packaging for use ; According to the melting performance test, the melting point of the covering agent is 1250°C, the melting time at 1350°C is 55s, and the surface tension is 0.43N / m, which meets the melting performance requirements of the ladle covering agent.

[0032] The coveri...

Embodiment 2

[0038] Spodumene, lime, magnesia, and carbon black are used as raw materials, and spodumene, lime, and magnesia are dried at 200°C, according to 80% of spodumene, 10% of lime, 5% of magnesia, and 5% of carbon black The batching, batching and preparation process are as follows: weigh the spodumene, lime, and magnesia according to the weight parts, mix well and pre-melt at 1350 ° C, cool with natural wind after melting, break after cooling, and then make Fine powder, mixed with carbon black in parts by weight, mixed evenly and finely ground to 200 mesh (particle size less than 0.074mm), after pulping, dried and shaped in a low-pressure spray granulation tower to form a hollow particle covering agent, moisture-proof packaging for later use; The melting performance test shows that the melting point of the covering agent is 1180°C, the melting time at 1350°C is 40s, and the surface tension is 0.32N / m, which meets the melting performance requirements of the ladle covering agent.

[...

Embodiment 3

[0045] Spodumene, lime, magnesia, and carbon black are used as raw materials, and spodumene, lime, and magnesia are dried at 200°C, according to 60% of spodumene, 25% of lime, 10% of magnesia, and 5% of carbon black The batching, batching and preparation process are as follows: weigh the spodumene, lime, and magnesia according to the weight parts, mix well and pre-melt at 1350 ° C, cool with natural wind after melting, break after cooling, and then make Fine powder, mixed with carbon black in parts by weight, mixed evenly and finely ground to 200 mesh (particle size less than 0.074mm), after pulping, dried and shaped in a low-pressure spray granulation tower to form a hollow particle covering agent, moisture-proof packaging for later use; Melting performance test shows that the melting point of the covering agent is 1215°C, the melting time at 1350°C is 47s, and the surface tension is 0.39N / m, which meets the melting performance requirements of the ladle covering agent;

[004...

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Abstract

The invention relates to the technical fields of steel smelting and ladle metallurgy, particularly a fluorine-free sodium-free ladle covering agent. The invention aims to provide a fluorine-free sodium-free ladle covering agent which has the characteristics of strong basicity, strong reducibility, high absorption and inclusion capacity, favorable spreadability and excellent heat-insulating property; and the invention also aims to solve the problems of high melting point, low melting speed, low desulphurization capacity and poor use effect in the existing CaO ladle covering agent, and to overcome the defect of contamination hazard since the covering agent contains sodium oxide, calcium fluoride and the like. The invention is characterized in that the covering agent is prepared from the following components in percentage by weight: 40-80% of spodumene, 10-40% of lime, 2-15% of magnesite and 1-10% of carbon black.

Description

technical field [0001] The invention relates to the technical fields of steel smelting and ladle metallurgy, in particular to a fluorine-free and sodium-free ladle covering agent. Background technique [0002] The initial ladle covering agent is mainly carbonized rice husk materials, which mainly play the function of preventing the oxidation of molten steel and keeping warm. The main components of carbonized rice husk are fixed carbon and silicon dioxide, which are acidic materials. Sometimes the content of silicon dioxide If it reaches more than 60%, it is easy to cause phosphorus return, sulfur return or oxygen increase of molten steel in the ladle, which has limitations when the quality of molten steel is high; The metallurgical effect is also paid more and more attention. Single-type covering agents such as carbonized rice husks can no longer meet the needs of high-cleanness molten steel, and then artificially synthesized composite covering agents are used; the current c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111C21C7/076
CPCY02P10/20
Inventor 李桂荣王宏明
Owner JIANGSU UNIV
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