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Method for Extracting Vanadium and Chromium by Top-bottom Combined Blowing Converter

A technology of top-bottom blowing and converter, which is used in the manufacture of converters, etc., to ensure the oxidation rate and overcome the low conversion temperature.

Active Publication Date: 2017-01-18
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] From the above prior art, the use of combined blowing converter to extract vanadium and chromium has not been reported, and it is still a precedent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] After the 80t converter is finished adding iron, the oxygen lance is used to supply oxygen, the oxygen lance is lowered to the right position, and 20% coolant is added after successful ignition. The coolant is iron oxide or coolant containing iron oxide. After blowing for 2.5 minutes, Add 50% coolant, and the last 30% coolant is added 2 minutes before the blowing is stopped, and the oxygen blowing time is controlled at 6 minutes; The 1.5m high lance position is used for 1.0min in the early stage of refining (that is, the oxygen lance is 1.5m away from the molten iron surface), the 1.2m low lance position is used in the middle stage (that is, the oxygen lance is 1.2m away from the molten iron surface), and 1.6m is used for 1.5min before the end of blowing. High lance position (that is, the oxygen lance is 1.6m away from the molten iron surface); the oxygen pressure of the converter is 0.60MPa, and the flow rate is controlled at 8000Nm 3 / h, oxygen consumption is 30Nm 3 ...

Embodiment 2

[0043] After adding iron to the 200t converter, use the oxygen lance to supply oxygen. After the oxygen lance is lowered to the right position and ignited successfully, add 40% coolant. The coolant is iron oxide or a coolant containing iron oxide. Add it after blowing for 1 minute. 30% coolant, the last 30% coolant is added 2 minutes before the blowing is stopped, and the oxygen blowing time is controlled at 12 minutes; when the oxygen lance is blowing oxygen, the gun position is controlled by the "high-low-high" mode, that is, the blowing The 1.9m high gun position is used for the first 0.5min (that is, the oxygen lance is 1.9m away from the molten iron liquid surface), the 1.6m low gun position is used in the middle period (that is, the oxygen lance is 1.6m away from the molten iron liquid surface), and the 1.8m high gun is used 1 minute before the end of blowing position (that is, the oxygen lance is 1.8m away from the molten iron surface); according to the capacity of the c...

Embodiment 3

[0045] After the 140t of iron mixing is completed, the oxygen lance is used to supply oxygen. The oxygen lance is lowered in place and 30% of the coolant is added after the ignition is successful. The coolant is iron oxide or a coolant containing iron oxide, and then 40 % coolant, the last 30% of the coolant is added 2 minutes before the blowing is stopped, and the oxygen blowing time is controlled at 9 minutes; the position of the oxygen lance is controlled in the "high-low-high" mode when blowing oxygen, that is, in the early stage of blowing 1.0min adopts 1.8m high lance position (that is, oxygen lance is 1.8m away from molten iron surface), mid-term adopts 1.5m low lance position (that is, oxygen lance is 1.5m away from molten iron surface), and 1.5min before the end of blowing adopts 1.9m high lance position (that is, the oxygen lance is 1.9m away from the molten iron surface); according to the capacity of the converter, the oxygen pressure is 0.85MPa, and the flow rate is...

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PUM

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Abstract

The invention relates to a method for extracting vanadium and chromium by using a top-bottom combined blowing converter and belongs to the field of iron and steel smelting. The invention provides the method for extracting vanadium and chromium by using the top-bottom combined blowing converter. The method for extracting vanadium and chromium by using the top-bottom combined blowing converter provided by the invention is characterized by comprising the following steps: blending vanadium and chromium molten iron in the converter; top-blowing O2 to the vanadium and chromium molten iron; bottom-blowing N2; adding a coolant in the process of top-bottom combined blowing to control the temperature of the vanadium and chromium molten iron within 1320-1390 DEG C to obtain vanadium and chromium slag and semisteel, wherein the use level of O2 is 10-30Nm<3> / tFe. According to the method provided by the invention, a relatively high vanadium oxidation rate can be guaranteed, and moreover, the difficulty of low carbon- chromium conversion temperature is overcome, the chromium oxidation rate is guaranteed, and comprehensive utilization of resources is facilitated.

Description

technical field [0001] The invention relates to a method for extracting vanadium and chromium in a top-bottom combined blowing converter, belonging to the field of iron and steel smelting. Background technique [0002] my country is a big country of vanadium-titanium magnetite, which is mainly distributed in Panxi, Sichuan, Chengde, Hebei and other regions; according to Cr 2 o 3 The vanadium-titanium magnetite is divided into ordinary vanadium-titanium magnetite and high-chromium vanadium-titanium magnetite (referred to as high-chromium vanadium-titanium magnetite). As a special vanadium-titanium magnetite resource, high-chromium vanadium-titanium magnetite resources are accompanied by precious chromium resources in addition to iron, vanadium, and titanium. Hongge vanadium-titanium magnetite in Panzhihua area is the largest in my country. Chromium ore resources, reserves of 3.6 billion tons, containing Cr 2 o 3 As high as 18 million tons, nearly twice the proven reserves ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C5/36
Inventor 陈炼谢兵王建戈文荪曾建华董克平黄正华李龙蒋龙奎
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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