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Process of extracting Cr-V oxide from high Cr, V and magnetite ore

A high-chromium vanadium-titanium and magnetite technology, applied in the field of iron and steel metallurgy, can solve the problems of waste of mineral resources and achieve effective extraction and separation

Active Publication Date: 2007-08-22
PANZHIHUA IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process steps of vanadium extraction by water method are crushing, roasting, leaching, and purification. This process can only extract vanadium, but chromium cannot be extracted, resulting in a great waste of mineral resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Use high-chromium vanadium-titanium magnetite to make pellets to obtain pellets, then mix high-chromium vanadium-titanium magnetite pellets with high-chromium vanadium-titanium magnetite powder, use blast furnace charge ratio, and smelt vanadium and chromium through blast furnace ironmaking When molten iron is made in a blast furnace, 20% of coke is added as a reducing agent, 3% of river sand, and 10% of lime are used as auxiliary materials; It comes out of the furnace at 1450°C, and the molten chrome-vanadium iron and reducing slag are obtained immediately after being released from the furnace. The composition of the molten chromium-vanadium iron is: 4.43% C, 0.36% V, 1.76% Cr, and the balance is Fe; then put the molten chromium-vanadium iron into a 120t converter Vanadium and chromium are extracted by oxygen blowing to obtain vanadium chromium slag and semi-steel. The oxygen pressure is 0.8 MPa, the blowing time is 6 minutes, and the blowing temperature is 1380 ° C. Th...

Embodiment 2

[0012] The charge is made of full-high chromium vanadium titanomagnetite powder, which is directly smelted and reduced through a 250kVA closed submerged electric furnace, with 30% coke as reducing agent, 2% river sand and 2% lime as flux; After stirring evenly, add to the furnace in batches. The reduction time is 200min, and when the end point temperature is 1700°C, the iron and slag are taken out of the furnace together. The composition of the molten chrome-vanadium iron after being released from the furnace is: 4.83% C, 0.44% V, 2.02% Cr, and the balance is Fe; then the molten chrome-vanadium iron is blown into a 150kg medium-frequency induction furnace to obtain vanadium-chrome slag and semi-steel , oxygen pressure 0.38MPa, blowing time 15min, blowing temperature 1700°C. The composition of the obtained chromium vanadium slag is: 7.88% V 2 o 5 、Cr 2 o 3 23.57%, 2.68% CaO, 32.10% TFe, 1.15% MFe, 8.14% SiO 2 , 3.68% MnO; finally, the chromium vanadium slag is separated b...

Embodiment 3

[0014] The furnace charge adopts the ratio of blast furnace charge, and is smelted and reduced through a 250kVA closed submerged electric furnace. The charge is mainly composed of sintered ore and lump ore. During smelting reduction, 10% coke is added for smelting. After the charge is mixed evenly, it is added into the furnace in batches. The reduction time is 120 minutes. The composition of molten chrome-vanadium iron is: 3.90% C, 0.34% V, 0.98% Cr, and the balance is Fe; then the molten chrome-vanadium iron is blown into a 150kg medium-frequency induction furnace to obtain vanadium-chrome slag and semi-steel, oxygen pressure 1.0MPa, blowing time 25min, blowing temperature 1600°C. The composition of the obtained chromium vanadium slag is: 6.06% V 2 o 5 、Cr 2 o 3 15.10%, 2.13% CaO, 35.40% TFe, 2.25% MFe, 11.14% SiO 2 , 3.72% MnO; finally, the chromium vanadium slag is separated by crushing, roasting, leaching, and purification to separate V 2 o 5 , and then, ammonium su...

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Abstract

The process of extracting Cr2O3 and V2O5 from high-chromium vanadium titanium magnetite includes the following steps: 1. smelting molten iron containing V 0.28- 0.50 wt% and Cr 0.5-2.5 wt% with high-chromium vanadium titanium magnetite in a blast furnace or an electric furnace; 2. air refining the molten iron to obtain V-Cr slag with V2O5 not less than 6 wt% and Cr2O3 not less than 15 wt%, and semisteel; and 3. separating V2O5 from the V-Cr slag through crushing, roasting, leaching and purifying; adding ammonium salt into separated liquid and regulating pH value to 2-10, so as to prepare Cr2O3. The present invention recovers and utilizes valuable metal from molten iron without affecting iron and steel production.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular to a method for extracting chromium vanadium oxides by using high chromium vanadium titanomagnetite. Background technique [0002] Compared with other vanadium-titanium magnetite in Panxi area, high-chromium vanadium-titanium magnetite has the same iron, titanium and vanadium content, and the chromium content is about ten times that of Panzhihua vanadium-titanium magnetite. Currently, high-chromium vanadium-titanium magnetite The blast furnace ironmaking-converter vanadium extraction-water vanadium extraction process used in magnetite only recovers iron and vanadium. The process steps used in water extraction of vanadium are crushing, roasting, leaching, and purification. This process can only extract vanadium, but not chromium, resulting in a great waste of mineral resources. Contents of the invention [0003] The technical problem to be solved by the present i...

Claims

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Application Information

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IPC IPC(8): C22B34/00C22B34/22C22B34/32C22B3/14C22B5/10
CPCY02P10/20
Inventor 戈文荪何为何群王建文永才汤天宇李安林彭毅何绍刚
Owner PANZHIHUA IRON AND STEEL
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