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Smelting method for preparing pellet vanadium titano-magnetite by internally adding carbon

A technology of vanadium-titanium magnetite and smelting method, which is applied in the field of vanadium-titanium magnetite smelting, can solve the problems of low vanadium-titanium recovery rate, easy pulverization and ring formation, poor pellet strength, etc., and achieve the goal of overcoming the difficulty of smelting Effect

Pending Publication Date: 2022-01-28
新疆葱岭钒钛有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can realize the comprehensive recovery of iron, vanadium and titanium, and the recovery rates of iron, vanadium and titanium are 85-89%, 58% and 74% respectively, but the production process is long, the consumption of sodiumizing agent is high, and the pellet strength after vanadium extraction Poor, easy to pulverize and form rings during reduction in the rotary kiln, and the recovery rate of vanadium and titanium is low
The high-temperature reduction method is that the iron concentrate pellets are first consolidated by high-temperature preheating (900-1000 ° C), and then reduced by a rotary kiln, electric furnace melting, separation of iron and vanadium and titanium, molten iron blowing to extract vanadium or recovery of iron and vanadium from slag , titanium, realized the comprehensive recovery of iron, vanadium and titanium, and reduced the consumption of sodiumizing agents, but there are still long production processes, high energy consumption, unstable separation effect of iron and vanadium and titanium during electric furnace melting, difficulty in controlling the flow direction of vanadium and titanium, and recovery of vanadium and titanium. Low rate and low grade of titanium-containing slag (TiO 2 45-50%) disadvantages
[0004] with TiO 2 It is estimated that the content of titanium in the vanadium-titanium magnetite in the electric furnace slag reaches about 30%. Such a high content will cause the viscosity of the electric furnace slag to increase, which in turn makes it difficult to separate molten iron and titanium slag.
Therefore, the recycling rate of titanium in the vanadium-titanium magnetite in the above-mentioned technology needs to be improved

Method used

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  • Smelting method for preparing pellet vanadium titano-magnetite by internally adding carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0038] Step 1, grind the vanadium-titanium magnetite, iron-carbon replacement agent, carbon source, and bentonite to -200 mesh, take 20kg of vanadium-titanium magnetite, add 3kg of coke, 0.6kg of coke powder, and 0.4kg of bentonite and mix well .

[0039] Step 2: Make pellets from the mixture, the disk speed is 15r / min, the particle size of the green balls is 8-12mm, the water content is about 10% when the cue ball grows up, and the average water content of the green balls is determined to be 8%. , The average compressive strength is 23N, and the average drop is 4 times.

[0040] Step 3: Roast the green balls in a high-temperature box furnace or a grate-rotary kiln for 120 minutes. When the calcination temperature reaches 1150°C, keep the balls for 60 minutes, and take them out after natural cooling. Calculate the average metallization rate and compressive strength of cooked balls after roasting, and determine that the average metallization rate of cooked balls is 91%, and th...

Embodiment 2

[0044] Step 1, grind the vanadium-titanium magnetite, iron-carbon replacement agent, carbon source, and bentonite to -200 mesh, take 20kg of vanadium-titanium magnetite, add 3kg of coke, 0.6kg of coal powder, and 0.4kg of bentonite and mix well .

[0045] Step 2, pelletize the mixture, the disk speed is 20r / min, the particle size of the raw ball is 8-12mm, the water content is about 8% when the cue ball grows up, and the average water content of the green ball is measured to be 7% , The average compressive strength is 19N, and the average drop is 3 times.

[0046] Step 4: Roast the green balls in a high-temperature box furnace or a grate-rotary kiln for 120 minutes. When the calcination temperature reaches 1150 ° C, keep the balls for 60 minutes, and take them out after natural cooling. Calculate the average metallization rate and compressive strength of cooked balls after roasting, and determine that the average metallization rate of cooked balls is 87%, and the compressive ...

Embodiment 3

[0050] Step 1, grind the vanadium-titanium magnetite, iron-carbon replacement agent, carbon source, and bentonite to -200 mesh, take 20kg of vanadium-titanium magnetite, add 1kg of coke, 1kg of coal powder, and 0.2kg of bentonite and mix well.

[0051] In step 2, the mixture is pelletized, the rotating speed of the disc is 10r / min, the particle size of the raw ball is 8-12mm, and the water content is about 11% during the growing process of the cue ball.

[0052] Step 4: Roast the green balls in a high-temperature box furnace or a grate-rotary kiln for 150 minutes. When the calcination temperature reaches 1000 ° C, keep the balls for 30 minutes, and take them out after natural cooling. Calculate the average metallization rate and compressive strength of cooked balls after roasting, and determine that the average metallization rate of cooked balls is 85%, and the compressive strength is 2835N.

[0053] Step 5, take 200g of vanadium-titanium ore green pellets, add 40g of coke pow...

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Abstract

The invention discloses a smelting method for preparing pellets from vanadium titano-magnetite by internally adding carbon, which is a method for comprehensively recovering vanadium, titanium and iron in the vanadium titano-magnetite, and comprises the following steps: firstly, adding coke powder, an iron-carbon displacer and bentonite into the vanadium titano-magnetite, making pellets of 8-12mm on a disc pelletizer, roasting the made pellets in a rotary kiln of a chain grate machine, producing metallized schreyerite, thermally charging the schreyerite in a submerged arc furnace or a high-temperature box-type furnace for reduction melting separation, realizing oxygen enrichment and pulverized coal injection in the submerged arc furnace, separating vanadium-containing molten iron and titanium slag, and preparing the titanium slag into titanium dioxide; and subjecting the separated vanadium-containing molten iron to oxygen blowing through an electric furnace to extract vanadium, separating vanadium slag and semi-steel molten iron out, and roasting and subjecting the vanadium slag to acid leaching to extract vanadium, so that recovery of vanadium, titanium and iron is achieved. The invention relates to a novel process for preparing pellet vanadium titano-magnetite by adding carbon and an iron-carbon displacer and realizing oxygen enrichment and pulverized coal injection smelting in a submerged arc furnace so as to overcome the technical problem of difficult schreyerite smelting in the prior art.

Description

【Technical field】 [0001] The invention belongs to the field of vanadium-titanium magnetite smelting, and in particular relates to a smelting method for preparing pellets of vanadium-titanium magnetite with internal carbon. 【Background technique】 [0002] my country has very rich resources of vanadium-titanium magnetite. In some areas, the ore belongs to high-titanium vanadium-titanium magnetite, because it contains high TiO 2 , the blast furnace smelting is difficult, and the slag over-reduction, viscosity increase, slag-iron separation difficulty, and high iron loss are prone to occur during the smelting process, which seriously affects the smelting technical indicators of the blast furnace. [0003] For the comprehensive utilization of vanadium-titanium magnetite, the traditional methods are mainly high-temperature sodium oxide roasting and high-temperature reduction. Among them, the process of high-temperature oxidized sodium roasting is the smelting process of sodium va...

Claims

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Application Information

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IPC IPC(8): C22B1/24C22B34/22C22B34/12C22B1/216C22B1/20C22B1/22C21B13/12
CPCC22B1/2406C22B34/22C22B34/1218C22B1/216C22B1/20C22B1/22C21B13/0006C21B13/0046C21B13/12Y02P10/20
Inventor 杨双平赵双河
Owner 新疆葱岭钒钛有限公司
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