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Method for recovering iron, vanadium and chromium in vanadium-titanium magnetite concentrate

A vanadium-titanium magnetite concentrate and magnetic separation technology, which is applied in the field of iron and steel smelting, can solve problems such as unsatisfactory recycling rate and unsmooth process, and achieve the effects of less power consumption, no pollution to the environment, and high metal recovery rate

Active Publication Date: 2012-04-18
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In non-blast furnace smelting, the direct reduction method of rotary hearth furnace has been studied more for many years, but it is still in the stage of testing and rectification. The main problem is that the process is not smooth, and the recovery rate of V, Ti, Cr is still low not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The chemical composition of the processed vanadium-titanium magnetite concentrate is: TFe: 59.32%, V 2 o 5 : 0.90%, Cr 2 o 3 : 0.64%, TiO 2 : 5.5%, particle size: less than 200 mesh accounts for 60% by weight.

[0018] A. After grinding the above-mentioned 100 tons of vanadium-titanium magnetite concentrate, carry out weak magnetic roughing with a magnetic field strength of 140kA / m, and then grind it into a fine ore that is less than 200 meshes and account for 90% of the mass ratio, and use 100kA / m The strength of the magnetic field is used for weak magnetic concentration to obtain concentrated ore;

[0019] B. Mix concentrate, coal powder, and industrial-grade sodium chloride according to the mass ratio of 100:10:21, mix them evenly, press them into hollow cylindrical blocks, put them into the reduction tank in layers, and put them in the block materials in the tank Put coal powder and desulfurization agent limestone powder. The amount of coal powder put in is 30%...

Embodiment 2

[0026] The chemical composition of the processed vanadium-titanium magnetite concentrate is: TFe: 58.55%, V 2 o 5 : 0.89%, Cr 2 o 3 : 0.62%, TiO 2 : 5.6%, particle size: less than 200 mesh accounts for 55% by weight.

[0027] A. After grinding the above-mentioned 100 tons of vanadium-titanium magnetite concentrate, carry out weak magnetic roughing with a magnetic field strength of 130kA / m, and then grind it into a fine ore less than 200 meshes accounting for 90% by mass, and use a magnetic field of 110kA / m The strength of the magnetic field is used for weak magnetic concentration to obtain concentrated ore;

[0028] B. Mix concentrate, coal powder, and industrial-grade sodium chloride according to the mass ratio of 100:10:20, mix them evenly, press them into hollow cylindrical blocks, put them into the reduction tank in layers, and put them in the block materials in the tank Put coal powder and desulfurization agent limestone powder. The amount of coal powder put in is 30...

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Abstract

The invention provides a method for recovering iron, vanadium and chromium in vanadium-titanium magnetite concentrate, which comprises the following steps: milling the vanadium-titanium magnetite concentrate, carrying out magnetic separation, directly reducing iron, milling, carrying out magnetic separation to obtain an iron powder product and tailings, and treating the tailings by the following steps: pelletizing, roasting, leaching while stirring, boiling the leaching liquor, simultaneously adding sulfates, cooling to crystallize and precipitate to obtain polyvanadates and liquor containing chromium, adding ferric sulfate into the liquor containing chromium to reduce chromium, and adding Ca(OH)2 to generate Cr(OH)3 precipitate. The method can be used for synchronously and effectively recovering multiple valuable metals, such as iron, titanium, vanadium and chromium, in the vanadium-titanium magnetite concentrate so as to produce products with high added value, such as high-quality reduced iron powder, red vanadium, chromium, titanium and the like, thereby sufficiently and effectively utilizing the limited ore resources in a reasonable way. The metal recovery rate of the method is high, wherein the recovery rate of iron is higher than 90%, the recovery rate of vanadium is higher than 80%, the recovery rate of chromium is higher than 78%, and the recovery rate of titanium is higher than 90%. The method is not involved with the use of coke, and has the advantages of low power consumption and no environment pollution.

Description

technical field [0001] The invention relates to a method for smelting vanadium-titanium magnetite concentrate, in particular to a method for comprehensively utilizing vanadium-titanium magnetite concentrate to recover iron, vanadium and chromium, belonging to the technical field of iron and steel smelting. technical background [0002] The vanadium-titanium magnetite concentrate is mainly composed of Fe and associated with various rare and high-value metals such as V, Cr, and Ti. Because the chemical composition of vanadium-titanium magnetite concentrate is complex, and various elements such as V, Cr, Ti are the same as Fe, the iron grade is much lower than other ordinary iron concentrates. The traditional process is to send the vanadium-titanium magnetite concentrate to the blast furnace for smelting, and then into the converter to extract the vanadium. The result of this is: the recovery rate of vanadium is low, only 65wt%, and basically no recovery of titanium and chromiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/00C21B13/00C22B3/04C22B34/12C22B34/22C22B34/32
CPCY02P10/20
Inventor 刘宁斌温海滨王涛李轶赵红全杨立新
Owner WUKUN STEEL
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