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Application of coal gangue used as converter slag inhibiting agent, and converter slag inhibiting method

A technology of coal gangue and converter, applied in converter slag suppression, coal gangue as a converter slag suppression application field, can solve the problems of economic impact, cost increase, waste of resources, etc., achieve low price, avoid waste, and control the effect of splashing

Active Publication Date: 2015-12-09
TANGSHAN STAINLESS STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods can achieve better results, but due to the complexity of the process, the cost will increase significantly after the ball pressing and other links, which will greatly affect the economy of the process; waste of resources

Method used

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  • Application of coal gangue used as converter slag inhibiting agent, and converter slag inhibiting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: The method for suppressing slag in the converter adopts the following specific process steps.

[0029] Conventional smelting in a 100-ton converter; the molten iron enters the furnace with a C content of 4.23wt%, a Si content of 0.66wt%, a P content of 0.0133wt%, a Ti content of 0.008wt%, and a molten iron temperature of 1320°C. The weight of molten iron is 105.3 tons, and the weight of scrap steel is 15.2 tons.

[0030] Due to the high content of silicon in molten iron, when the amount of oxygen blown into the converter reaches 25%, the flue gas detection system shows that the CO content rises faster, indicating that there is a risk of splashing; add 100kg of slagging agent through the high-level silo, and other processes continue to follow The model setting was automatically executed, the CO content curve returned to normal, and no slag splashing occurred in the early stage. End point: End point C is 0.054wt%, P is 0.013wt%, and temperature is 1646°C; t...

Embodiment 2

[0031] Embodiment 2: The method for suppressing slag in the converter adopts the following specific process steps.

[0032] Conventional smelting in a 100-ton converter; the C content of molten iron entering the furnace is 4.33%, the Si content is 0.42%, the P content is 0.0130%, and the Ti content is 0.008%, and the temperature of the molten iron is 1240°C. The weight of molten iron is 105.8 tons, and the weight of scrap steel is 15.9 tons.

[0033] Due to the low temperature of molten iron entering the furnace, when the amount of oxygen blown into the converter reaches 30%, the flue gas detection system shows that CO is always lower than 30%. Due to the low temperature of the molten pool, FeO accumulates in large quantities, indicating the risk of splashing; The slag agent was 150kg, and other processes continued to be automatically executed according to the model settings, the CO content curve returned to normal, and no slag splashing occurred in the early stage. End point...

Embodiment 3

[0034] Embodiment 3: The method for suppressing slag in the converter adopts the following specific process steps.

[0035] Conventional smelting in a 100-ton converter; the content of C in the molten iron is 4.25%, the content of Si is 0.50%, the content of P is 0.0125%, and the content of Ti is 0.028%, and the temperature of the molten iron is 1335°C. The weight of molten iron is 104.3 tons, and the weight of scrap steel is 16.2 tons.

[0036] Due to the high content of Ti content in the molten iron, the heating rate of the molten pool is too fast. When the oxygen blowing amount of the converter reaches 25%, the flue gas detection system shows that the CO content rises faster, which indicates that there is a risk of splashing; Other processes continued to be automatically executed according to the model settings, the CO content curve returned to normal, and no slag splashing occurred in the early stage. End point: End point C is 0.044%, P is 0.015%, and temperature is 1656°...

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Abstract

The invention discloses the application of coal gangue used as a converter slag inhibiting agent, and a converter slag inhibiting method. According to the method, coal gangue is used as slag inhibiting agent base materials; when slag inhibition is performed during blowing, steel of 1-2kg / ton is added every time; when slag inhibition is performed during furnace inversion and steel tapping, steel of 0.2-0.5kg / ton is added every time. A good slag inhibiting effect can be reached by a small quantity of the slag inhibiting agent, and the splash during converter blowing can be effectively controlled. Because the price of raw materials is low, and a processing technology is simple, the cost of the slag inhibiting agent only accounts for 10-30% of that of a conventional technology; the waste of raw coal or magnesium resources is effectively avoided. Aiming at the problems of over-high soft blowing of iron oxides during blowing, difficult converter inversion at a blowing end, and slag overflow in steel tapping after reblowing, according to the method, the slag inhibiting agent is added, so that slag iron oxides can be effectively reduced, and the purposes for controlling splash and quickly tapping steel are reached. The method does not have bad influences on the environment, and besides, resources are saved, and cost is reduced, so that the method has a popularization and application value in steelmaking production plants.

Description

technical field [0001] The invention relates to a technology for suppressing slag in the blowing process of a steelmaking converter, in particular to the application of coal gangue as a converter for suppressing slag and the method for suppressing slag in the converter. Background technique [0002] In the converter production process, FeO in slag plays an important role in the melting of slag and the control of phosphorus content. However, in actual production, the slag FeO is too high in the process, and the unbalanced reaction of slag and steel brings many problems to smelting. Excessively high FeO results in high iron consumption; the risk of splashing during the blowing process increases and pollutes the environment; the desulfurization capacity of slag is reduced; the oxidation of molten steel is improved, which affects the quality of molten steel and refractory materials; Definitely a safety hazard. [0003] The method of suppressing excessive FeO is generally to us...

Claims

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Application Information

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IPC IPC(8): C21C5/36
Inventor 周泉林李阳邢金栋李鹏刘海波王肖周航赵铁成
Owner TANGSHAN STAINLESS STEEL
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