Slag splashing converter protection method
A technology of slag splashing to protect the furnace and slag splashing, which is applied in the field of slag splashing to protect the furnace, can solve problems such as the deterioration of molten steel quality, the impact on the hit rate of the converter, and the existence of safety hazards, so as to achieve the essentialization of safety and improve the hit rate of one down , the effect of reducing production costs
Inactive Publication Date: 2021-07-30
XINGTAI IRON & STEEL
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Problems solved by technology
When the converter operates with low iron consumption and slag retention, the scrap steel ratio of the converter reaches more than 20%, and the contact area between the scrap steel and the converter lining increases. At this time, the liquid high iron oxide and low melting point slag left in the furnace acts as a binder Part of the steel scrap adheres to the lining of the converter. During the blowing process, this part of the s
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Embodiment 1－6
[0017] Nitrogen or other inert gas, such as argon, can be used as the furnace protection gas by slag splashing. For cost considerations, nitrogen gas is used in Examples 1-6, and nitrogen is blown by an oxygen lance to protect the furnace by slag splashing. The slag splashing process includes the initial stage of slag splashing, the middle stage of slag splashing, and the late stage of slag splashing. 初 and nitrogen pressure P 初 See Table 1, the oxygen lance in the mid-stage of slag splashing is first raised to the high lance position, at this time the distance from the furnace bottom is h 中1 , as the slag splashing continues, the lance position is gradually lowered, and the minimum distance between the oxygen lance and the furnace bottom in the mid-stage of slag splashing is h 中2 , h 中1 、h 中2 See Table 1. In the late stage of slag splashing, the distance h between oxygen and furnace bottom 后 and nitrogen pressure P 后 See Table 1. Add reducing agent in the later stage of...
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The invention provides a slag splashing converter protection method. A converter blows nitrogen through an oxygen lance to carry out slag splashing converter protection. The method comprises the following steps that (1) in the initial stage of slag splashing, the distance between the oxygen lance and the bottom of the converter is controlled to be 700-1000 mm, and the pressure of the nitrogen is controlled to be 0.85-0.95 Mpa; (2) in the middle stage of slag splashing, the oxygen lance is firstly lifted to the position 2000-2500 mm away from the bottom of the converter, and along with continuing of slag splashing, the position of the lance is gradually lowered to the position 950-1050 mm away from the bottom of the converter; and (3) in the later stage of slag splashing, the distance between the oxygen lance and the bottom of the converter is 700-900 mm, the pressure of the nitrogen is controlled to be 0.95-1.1 Mpa, a reducing agent is added at the moment, and FeO in slag is reduced into Fe. Potential safety hazards caused by the fact that steel scraps adhere to a lining of the converter are eliminated, safety essence is achieved, the first-pouring hit rate of the converter is increased, the production cost is reduced, and the molten steel quality is improved.
Description
technical field [0001] The invention belongs to the technical field of iron and steel metallurgy converter smelting, and in particular relates to a method for protecting a furnace by splashing slag. Background technique [0002] The converter leaves part of the slag after tapping, and uses an oxygen lance to spray nitrogen to splash the slag onto the furnace wall to achieve the purpose of protecting the furnace, which is called slag splashing to protect the furnace. [0003] After the converter slag splashing ends, the high melting point high magnesium oxide slag is splashed on the converter wall, leaving a small amount of liquid high iron oxide low melting point slag. When the converter operates with low iron consumption and slag retention, the scrap steel ratio of the converter reaches more than 20%, and the contact area between the scrap steel and the converter lining increases. At this time, the liquid high iron oxide and low melting point slag left in the furnace acts a...
Claims
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Login to View More IPC IPC(8): C21C5/44C21C5/28
CPCC21C5/443C21C5/28Y02P10/20
Inventor 赵学强曹洪波和红杰韩清连李智刚阎丽珍霍志斌荣飞范建英
Owner XINGTAI IRON & STEEL