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Control method for converter double-slag smelting

A control method and slag technology, applied in the manufacture of converters, etc., can solve problems affecting the stability of smelting in the later stage, insufficient slag discharge by lifting guns, and inability to release slag, so as to reduce the loss of metal materials, increase the amount of slag discharge, and reduce Effect of Iron Oxide Content

Pending Publication Date: 2019-11-22
SHANGHAI MEISHAN IRON & STEEL CO LTD
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Problems solved by technology

[0002] Converter double slag smelting technology is an effective control measure to control metal splashing in the early stage of converter smelting and to eliminate the slag formed in the early stage for smelting low-phosphorus steel. Oxygen time, how to control the basicity of slag in the early stage, and how to adjust the influence of slag foaming state on slag discharge after lifting the lance, if it is judged based on manual experience that splashing may occur due to late lifting of the lance, or premature lifting of the lance As a result, the amount of slagging is insufficient, and the early SiO cannot be 2 The slag with high content is released, which affects the stability of later smelting

Method used

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Embodiment 1

[0023] In this embodiment, 150 tons of molten iron in the current furnace, 20 tons of scrap steel, and a converter flue gas flow rate of 100,000 m 3 / h, the composition of molten iron is shown in Table 1 below.

[0024] Table 1

[0025] C% Si% M n %

[0026] The slag composition of the upper furnace is shown in Table 2:

[0027] Table 2

[0028] CaO% SiO 2 %

[0029] The control method of converter double-slag smelting in this embodiment comprises the following steps:

[0030] The first step is to leave part or all of the slag from the previous furnace for the current furnace, and add lime and / or Magnesium-containing auxiliary materials are used as slagging, and the amount of slagging added in the early stage makes the binary basicity R of the slag in the early stage of the current furnace meet 1.1≤R≤1.3, and the content of magnesium oxide is greater than 6%;

[0031] Among them, the amount of slag remaining in the upper furnace slag is: M 留渣量 =R...

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Abstract

The invention relates to a control method for converter double-slag smelting. The control method comprises the following steps that 1, the furnace slag of an upper furnace is partially or totally leftto a current furnace; 2, the early-stage total oxygen consumption of the current furnace is calculated; 3, oxygen supply is stopped when the oxygen supply amount reaches the total oxygen consumptionof the earlier stage or the carbon monoxide concentration is greater than 15%; 4, nitrogen is immediately blown into the furnace through the oxygen lance after the oxygen supply is stopped; 5, after the nitrogen is supplied to the furnace, slags are poured into the furnace; and 6, the oxygen is continuously supplied into the furnace after the slag discharge is ended until the blowing is completed.According to the method, splashing during early-stage oxygen supply can be effectively avoided, later slag foam formation is good, the slag discharge amount can be finally increased, the total iron content of furnace slag during early-stage slagging can be reduced, and the metal material loss is reduced.

Description

technical field [0001] The invention relates to a control method for double-slag smelting in a converter, which is suitable for controlling the splashing in the early stage of the converter and the smelting of low-phosphorus steel. Background technique [0002] Converter double slag smelting technology is an effective control measure to control metal splashing in the early stage of converter smelting and to eliminate the slag formed in the early stage for smelting low-phosphorus steel. Oxygen time, how to control the basicity of slag in the early stage, and how to adjust the influence of slag foaming state on slag discharge after lifting the lance, if it is judged based on manual experience that splashing may occur due to late lifting of the lance, or premature lifting of the lance As a result, the amount of slagging is insufficient, and the early SiO cannot be 2 The release of slag with high content will affect the stability of later smelting. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30
CPCC21C5/30
Inventor 胡建光
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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