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A pretreatment method for high magnesium vanadium slag based on magnesizing roasting

A high-magnesium vanadium slag and pretreatment technology, which is applied in the field of vanadium-titanium metallurgy, can solve problems such as the difficulty in solving the three wastes of the sodium chemical method, and achieve the effects of simplifying the pretreatment process, reducing erosion and erosion, and suppressing the three wastes

Active Publication Date: 2022-04-05
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method effectively utilizes the waste heat of vanadium slag, but it is difficult to solve the three wastes treatment problems brought about by the sodiumization method

Method used

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  • A pretreatment method for high magnesium vanadium slag based on magnesizing roasting
  • A pretreatment method for high magnesium vanadium slag based on magnesizing roasting

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Embodiment 1

[0021] A kind of high-magnesium vanadium slag production and pretreatment method based on magnesizing roasting is characterized in that, comprises the following steps:

[0022] (1) In the process of using vanadium-titanium-magnetite as raw material for steelmaking, after 125T molten iron is blended into the converter, 16kg / t Fe coolant (scrap, iron oxide scale, iron ore, etc.) is added within 3 minutes before the start of oxygen blowing , within 2 minutes after adding the coolant, add 8 kg / t Fe of the mixture of magnesia and waste furnace lining (in which the MgO content is above 90%, and the CaO content is about 2%), and the MgO / V in the vanadium slag 2 o 5 The mass ratio is controlled at 0.4 to 0.5.

[0023] Use top-blown oxygen and bottom-blown nitrogen for blowing; the intensity of top-blown oxygen supply is 3m 3 / (min·tFe), oxygen blowing time is 6min, oxygen pressure is 0.9MPa; bottom blowing nitrogen flow rate is 0.4m 3 / (min·tFe). The molten pool temperature during...

Embodiment 2

[0032] A kind of high-magnesium vanadium slag production and pretreatment method based on magnesizing roasting is characterized in that, comprises the following steps:

[0033] (1) In the process of using vanadium-titanium magnetite as raw material for steelmaking, after 125T molten iron is blended into the converter, 25kg / t Fe coolant (scrap, iron oxide scale, iron ore, etc.) is added within 3 minutes before the start of oxygen blowing , add magnesia 4kg / t Fe within 2min after adding coolant, MgO / V in vanadium slag 2 o 5 The mass ratio is controlled at 0.6-0.7.

[0034] Top-blown oxygen and bottom-blown nitrogen are used for blowing; the strength of top-blown oxygen supply is 2.5m 3 / (min·tFe), oxygen blowing time is 6.5min, oxygen pressure is 0.8MPa; bottom blowing nitrogen flow rate is 0.4m 3 / (min·tFe). Blowing is carried out by blowing oxygen with an oxygen lance, and the blowing time is 6.5 minutes. The molten pool temperature during the blowing process does not exc...

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Abstract

The invention discloses a method for producing and pretreating high-magnesium vanadium slag based on magnesizing roasting, and belongs to the technical field of vanadium metallurgy. The invention provides a new idea for solving the three-waste disposal problem and the unutilized waste heat of vanadium slag in the existing vanadium extraction process by sodium and calcification methods. The steps are: after the molten iron is mixed into the converter, add coolant and raw materials containing magnesia, and use top-blown oxygen and bottom-blown nitrogen / argon for blowing; after blowing, leave the high-magnesium vanadium slag in the converter for pretreatment, The bottom blowing gas is switched to oxygen; the cooled pretreated vanadium slag is crushed and ground in a conventional way, and roasted without salt for a short time. The invention directly generates high-magnesium vanadium slag in the converter and utilizes the waste heat of the vanadium slag to complete the partial oxidation of the vanadium slag, thereby creating favorable conditions for subsequent simplification of the roasting process and reduction of roasting costs.

Description

technical field [0001] The invention belongs to the technical field of vanadium-titanium metallurgy, in particular to a method for extracting vanadium in a converter and pretreating vanadium slag, in particular to a method for producing vanadium slag based on magnesizing roasting and utilizing waste heat of vanadium slag. Background technique [0002] Vanadium is a non-ferrous metal with high melting point, high hardness and non-magnetic properties. It is widely used in steel, chemical industry, aerospace, medicine, energy and other fields. Vanadium-titanium magnetite is the main raw material for extracting vanadium in the world. my country has rich reserves of vanadium-titanium magnetite resources, with proven reserves exceeding 10 billion tons, mainly distributed in Panzhihua, Sichuan, Xichang and Chengde, Hebei. There are also a large number of vanadium-titanium magnetite resources in Hanzhong, Shaanxi, Xunyang, Xingyang, Hubei, Xingning, Guangdong, and Daixian, Shanxi. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C5/35C22B1/02C22B7/04C22B34/22
CPCC21C5/36C21C5/35C22B1/02C22B7/04C22B7/007C22B34/22
Inventor 刁江刘良李鸿乂谢兵
Owner CHONGQING UNIV
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