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Method for Extracting Chromium and Vanadium from Vanadium-Chrome Iron Water and Reducing Oxygen Consumption

A technology of vanadium chromium molten iron and oxygen, which is applied in the manufacture of converters, etc., can solve the problems of difficult extraction of chromium, and achieve the effects of overcoming low conversion temperature of carbon and chromium, reducing carbon oxidation rate, and simple process

Active Publication Date: 2016-09-07
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to solve the problem that it is difficult to extract vanadium and chromium from high-chromium vanadium-chromium-containing molten iron, and provides a new method for extracting chromium and vanadium from vanadium-chromium-containing molten iron while reducing oxygen consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] After the 80t converter is finished adding iron, the oxygen lance is lowered in place, and 30% coolant is added after successful ignition. The coolant is iron oxide or coolant containing iron oxide. After blowing for 1.5 minutes, add 20% coolant. The last 50% of the coolant is added 2 minutes before the blowing is stopped, and the oxygen blowing time is controlled at 9 minutes; the oxygen pressure of the converter is 0.65MPa, and the flow rate is controlled at 8000Nm 3 / h, oxygen consumption is 15Nm 3 / tFe; the amount of coolant is controlled at 30kg / tFe; the flow rate of bottom nitrogen gas in the non-converting stage is controlled at 0.002m 3 / (min·tFe) or less, use 0.12m from blowing to 1.5min before the end of blowing 3 / (min·tFe) intensity bottom blowing CO 2 Gas, the bottom blowing gas is switched to nitrogen 1.5 minutes before the end of blowing to start the next furnace; after the end of smelting, the semi-steel and vanadium-chromium slag are separated, and th...

Embodiment 2

[0038] After the 200t converter is finished adding iron, the oxygen lance is lowered in place, and 10% coolant is added after successful ignition. The coolant is iron oxide or coolant containing iron oxide. After blowing for 1.5 minutes, 50% coolant is added. The last 40% of the coolant is added 2 minutes before the blowing is stopped, and the oxygen blowing time is controlled at 12 minutes; the oxygen pressure of the converter is 1.0MPa, and the flow rate is controlled at 24000Nm 3 / h, oxygen consumption is 35Nm 3 / tFe; the amount of coolant is controlled at 60kg / tFe; the flow rate of bottom nitrogen gas in the non-converting stage is controlled at 0.002m 3 / (min·tFe) or less, use 0.60m from blowing to 1 minute before the end of blowing 3 / (min·tFe) intensity bottom blowing CO 2 Gas, the bottom blowing gas is switched to nitrogen gas 1 minute before the end of blowing to start the next furnace; after the end of smelting, the semi-steel and vanadium-chromium slag are separat...

Embodiment 3

[0040] After the 140t of iron mixing is completed, the oxygen lance is lowered into place and 20% of the coolant is added after successful ignition. 40% of the coolant is added 2 minutes before the blowing is stopped, and the oxygen blowing time is controlled at 10 minutes; according to the capacity of the converter, the oxygen pressure is 0.85MPa and the flow rate is controlled at 16000Nm 3 / h, oxygen consumption is 20Nm 3 / tFe; the amount of coolant is controlled at 45kg / tFe; the flow rate of bottom nitrogen gas in the non-converting stage is controlled at 0.002m 3 / (min·tFe) or less, use 0.40m from blowing to 1.5min before the end of blowing 3 / (min·tFe) intensity bottom blowing CO 2 Gas, the bottom blowing gas is switched to nitrogen 1.5 minutes before the end of blowing to start the next furnace; after the end of smelting, the semi-steel and vanadium-chromium slag are separated, and the obtained semi-steel is transported to the steelmaking converter for steelmaking. Va...

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PUM

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Abstract

The invention belongs to the field of iron and steel smelting, and specifically relates to a method for extracting vanadium and chromium from vanadium and chromium containing molten iron and reducing oxygen consumption. The method specifically comprises the steps of feeding vanadium and chromium containing molten iron into a converter; blowing oxygen to the vanadium and chromium containing molten iron, wherein the quantity of blown oxygen is controlled to be 15 to 35Nm<3> / tFe, and a cooling agent is added during oxygen blowing to control the temperature of the vanadium and chromium containing molten iron to be 1320 to 1390 DEG C; CO2 and N2 are alternatively supplied from the bottom of the converter during blowing, wherein nitrogen is blown from the bottom at the non-blowing stage, and the flow is controlled to be less than 0.002m<3> / (min.tFe), CO2 is blown from the bottom at the strength of 0.12 to 0.60m<3> / (min.tFe) during the period of blowing and 1 to 1.5min before blowing, and the gas blown from the bottom is switched into nitrogen within 1 to 1.5min before blowing is done until the blowing is performed for the next converter. With the adoption of the method, high vanadium oxidizing rate can be ensured, and meanwhile, the difficulty of low carbon chromium conversion temperature can be overcome, the oxidizing rate of chromium can be ensured, the carbon oxidizing rate can be reduced, and the comprehensive utilization of vanadium and chromium resources can be improved.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a method for extracting chromium and vanadium from molten iron containing vanadium and chromium and reducing oxygen consumption. 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 hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30C21C5/36
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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