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A method for making slag from semi-steel

A technology for slag auxiliary material and iron and steel water, which is applied in the metallurgical field and can solve the problems of insufficient heat, late formation of initial slag, and few acidic slag-forming substances.

Active Publication Date: 2016-04-13
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the vanadium-titanium magnetite molten iron is extracted from vanadium, its carbon mass percentage is lower than that of ordinary molten iron (3.0-3.8% by weight), and the content of silicon and manganese heating slagging elements is traces. Therefore, half of the vanadium-titanium magnet in Panxi area Molten steel smelting has the characteristics of less acidic slagging substances, single slag system components, late formation of initial slag, and insufficient heat in the blowing process, which makes semi-steel steelmaking more difficult than molten iron steelmaking, and the dephosphorization rate is lower. Low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] A 120t converter is used for semi-steel steelmaking, wherein the composition content of semi-steel molten iron after vanadium extraction is shown in Table 1 below, and the temperature of entering the furnace of semi-steel molten iron is 1300°C.

[0064] Table 1

[0065] Element

[0066] The conventional operation is adopted in the first furnace smelting of the converter, that is, the semi-steel molten steel after vanadium extraction as mentioned above is mixed into the converter, and then the second part of slag-making auxiliary materials is added to the converter, and the slag is left after blowing is completed and the slag is splashed to protect the furnace 2.5t, for the next furnace smelting.

[0067] From the second furnace smelting, adopt the following concrete method to smelt in the present embodiment:

[0068] Before adding the vanadium-extracted semi-steel molten iron into the converter, add the first part of slagging auxiliary materials, including 5...

Embodiment 2

[0074] A 120t converter is used for semi-steel steelmaking, wherein the composition content of the semi-steel molten iron after vanadium extraction is shown in Table 2 below, and the furnace entry temperature of the semi-steel molten iron is 1360°C.

[0075] Table 2

[0076] Element

[0077] The conventional operation is adopted in the first furnace smelting of the converter, that is, the semi-steel molten steel after vanadium extraction as mentioned above is mixed into the converter, and then the second part of slag-making auxiliary materials is added to the converter, and the slag is left after blowing is completed and the slag is splashed to protect the furnace 2t, for the next furnace smelting.

[0078] From the second furnace smelting, adopt the following concrete method to smelt in the present embodiment:

[0079] Before adding the vanadium-extracted semi-steel molten iron into the converter, first add the first part of slagging auxiliary materials, including...

Embodiment 3

[0085] A 120t converter is used for semi-steel steelmaking, wherein the composition content of the semi-steel molten iron after vanadium extraction is shown in Table 3 below, and the furnace entry temperature of the semi-steel molten iron is 1340°C.

[0086] table 3

[0087] Element

[0088] The conventional operation is adopted in the first furnace smelting of the converter, that is, the semi-steel molten steel after vanadium extraction as mentioned above is mixed into the converter, and then the second part of slag-making auxiliary materials is added to the converter, and the slag is left after blowing is completed and the slag is splashed to protect the furnace 3.5t, for the next furnace smelting.

[0089] From the second furnace smelting, adopt the following concrete method to smelt in the present embodiment:

[0090] Before adding the vanadium-extracted semi-steel molten iron into the converter, add the first part of slagging auxiliary materials, including 7kg...

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PUM

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Abstract

The invention discloses a semisteel slag forming method which comprises the following steps: adding semisteel molten iron after vanadium extraction and a first part of slagging auxiliary material into a converter; and sequentially adding iron silicon alloy and a second part of slagging auxiliary material into the converter. The method disclosed by the invention can implement quick slag formation on the semisteel molten iron after vanadium extraction on the premise of well controlling the slag state.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for making semi-steel slag. Background technique [0002] my country's vanadium-titanium magnetite deposits are widely distributed and rich in reserves. The reserves and mining volume rank third in the country's iron ore. The proven reserves are 9.83 billion tons, and the prospective reserves are more than 30 billion tons. They are mainly distributed in Panxi, Sichuan (Panzhihua-Xichang ) region, Hebei Chengde region, Shaanxi Hanzhong region, Hubei Yunyang, Xiangyang region, Guangdong Xingning and Shanxi Daixian and other regions. Among them, the Panxi (Panzhihua-Xichang) area is the main ore-forming belt of vanadium-titanium magnetite in my country and one of the important production areas of similar deposits in the world. It is about 300 km long from north to south, and 7 large and extra-large deposits have been proven. , 6 medium-sized ore deposits. There are many ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/32C21C7/04
Inventor 陈路常军曾建华梁新腾杨森祥黄德胜杜丽华张彦恒
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP