Slag stopping material, slag stopping method and combined technology method of slag stopping and slag splashing protection

A technology of slag splashing to protect the furnace and combined process, which is applied in the field of metallurgy

Inactive Publication Date: 2015-03-25
INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The invention provides a slag blocking material and a slag blocking method capable of preventing slag dropping in the later stage of converter steelmaking and tapping, and a combined process of slag blocking and slag splashing to protect the furnace, which successfully solves the existing slag blocking process and slag splashing The above-mentioned problems existing in the furnace protection process

Method used

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  • Slag stopping material, slag stopping method and combined technology method of slag stopping and slag splashing protection

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preparation example Construction

[0081] (1) Preparation of slag blocking material

[0082] The sum of the mass percentages of CaO, MgO and C in the slag blocking material of the present invention accounts for more than 40% of the total mass of the slag blocking slag material, and the ignition rate is less than 47%, wherein the mass percentage content of C is more than 40%. It is higher than 25% of the total mass of the slag blocking material, and the balance is the unavoidable impurities in the slag blocking material raw materials, such as SiO 2 、Al 2 o 3 Wait. The carbon (C) refers to CO 3 2- other than carbon. The ignition loss refers to CaCO 3 , MgCO 3 , Ca(OH) 2 , Mg(OH) 2 CO in 3 2- and OH - and volatile matter, where CO 3 2- , OH - The ratio of volatile matter and volatile matter in ignition loss is determined by the selected raw materials. CaO and MgO in the slag blocking material may also exist in the form of calcium carbonate, magnesium carbonate or calcium magnesium carbonate (such a...

Embodiment 1

[0109] On a converter with a steel output of 300t in a steel plant, the slag retaining method of the present invention was used to carry out the slag retaining test, and the slag retaining ball was used to carry out the slag retaining test instead of the slag retaining method of the present invention. The smelted steel was Q195. A=5.15×10 is determined according to the comprehensive factors such as the bulk density of the slag material, the thickness of the slag layer and its density of the slag -3 , so it is determined from the formula (1) that the amount of the slag-blocking material added is 1546kg, the temperature of the slag-blocking slag material is 26°C, and the mass percentage of the powder contained in the slag-blocking slag material is 46%.

[0110] The chemical composition of the slag blocking material: CaO 9.5%, MgO 60.2%, C 19.9%, ignition loss 6.8%, and the balance is unavoidable impurities.

[0111] The specific operation process is as follows: put 1546kg of sl...

Embodiment 2

[0115] On a converter with a steel output of 180t in a steel plant, the slag retaining method of the present invention was changed from the original slag retaining ball to the slag retaining test, and the smelted steel was Q235. A=3.1×10 is determined according to the comprehensive factors such as the bulk density of the slag blocking material, the thickness of the slag layer and its density of the slag -3 , so that according to the formula (1), it is determined that the amount of slag-blocking slag added is 558kg, the temperature of slag-blocking slag is -46°C, and the mass percentage of powder contained in slag-blocking slag is 27%.

[0116] The composition of the slag blocking material: CaO 10.2%, MgO 47.9%, C 20.3%, ignition loss 17.5%, and the balance is unavoidable impurities.

[0117] The specific operation process is as follows: put 828kg of slag-stopping slag into the feeding trough, and when the tilting angle of the converter reaches 90°, put the slag-stopping slag i...

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Abstract

The invention relates to a slag stopping material, a slag stopping method and a combined technology method of slag stopping and slag splashing protection. The sum of mass percentages of CaO, MgO and C in the slag stopping material accounts for over 40% of the total mass of the slag stopping material, igloss is smaller than 47% of the total mass of the slag stopping material, and the mass percent of C is not more than 25% of the total mass of the slag stopping material. The slag stopping method comprises the step of putting a certain amount of slag stopping material on the liquid level area over a steel tapping hole in a converter. The slag stopping material, the slag stopping method and the combined technology method of slag stopping and slag splashing protection have the following beneficial effects: roughing slag amount is reduced, the thickness of the slag blanket in a ladle is thinned obviously, the tasks of deoxidation of molten steel in the ladle and modification of top slag are relieved, the consumption of deoxidizer is lessened, the phenomena of rephosphorization and silicon pick up in the refining process of the molten steel are reduced, the consumption of slag regulating materials is lowered, the time of molten steel refining is shortened and the smelting cost is decreased; and after steel tapping is finished, the slag stopping material can be directly used as a slag splashing protection material, the use amount of the slag splashing protection material is reduced, the time of slag splashing protection is shortened and the working efficiency of the converter is enhanced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and particularly relates to a slag blocking material, a slag blocking method used in the later stage of converter steelmaking and tapping, and a combined process method of slag blocking and slag splashing for furnace protection. Background technique [0002] During the converter steelmaking process, silicon, manganese, phosphorus, sulfur, iron, etc. in molten iron are oxidized due to oxygen blowing, and the resulting oxidation products enter the slag. When the converter is tapping, if the slag is not well blocked, some slag will enter the ladle. Since the molten steel needs to be deoxidized and alloyed after the converter is tapped, the ladle environment becomes a reducing atmosphere. At this time, part of the silicon, manganese, and phosphorus in the slag will be reduced to the molten steel, which increases the difficulty of controlling the composition of the molten steel. The iron oxide car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/36
Inventor 孙中强
Owner INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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