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Method for recovering vanadium, titanium and iron from vanadium titanium magnetite

A technology for vanadium-titanium-magnetite and vanadium-titanium-iron, which is applied in the field of recovering vanadium-titanium-iron, can solve the problems of technical difficulty, large processing capacity, and difficulty in industrialization, and achieves simplified processing technology, reduced environmental pollution, and low realization difficulty. Effect

Active Publication Date: 2010-01-06
SICHUAN LOMON MINING & METALLURGY
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  • Description
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AI Technical Summary

Problems solved by technology

The problem reflected in the industrialization of this process is: first, the titanium in the vanadium-titanium magnetite enters the blast furnace slag (TiO 2 content of about 15% to 22%), and the titanium in it cannot be recycled; secondly, coke must be used in blast furnaces, but coking coal is currently in short supply all over the world, and corresponding coking equipment factories are needed; thirdly, vanadium-titanium magnetite It needs to be sintered to make blocks, and corresponding sintering plants are required; Fourth, a large amount of dust and harmful gases are released during coking, sintering and blast furnace smelting in this process, which seriously pollutes the environment
This process first uses a rotary kiln to pre-reduce vanadium-titanium magnetite, then smelts vanadium-containing molten iron in an electric furnace, and then blows vanadium slag. The semi-steel after vanadium blowing is then smelted into steel by a converter. The main problems of this process are: Titanium in titanomagnetite in electric furnace slag (TiO 2 content of about 30%), it is impossible to recycle titanium in electric furnace slag
[0005] 3. For a long time, my country has studied a variety of treatment processes for the recovery of iron, vanadium and titanium from vanadium-titanium magnetite, mainly including shaft furnace-electric furnace separation process, fluidization-electric furnace separation process, rotary kiln-electric furnace separation process and tunnel kiln -process technologies such as ore dressing and separation, but the main problems of these traditional processes are: due to the characteristics of the vanadium-titanium magnetite mineral structure, it is a composite ore that is difficult to reduce, and the vanadium-titanium magnetite is in the low-temperature reduction stage (i.e. from Fe 2 o 3 reduced to Fe 3 o 4 stage) expansion occurs, so it is easy to pulverize and bond during the reduction process, so that the metallization rate of the above reduction process is too low and has no economic value, so it is difficult to industrialize
Although the main benefit of the patent for separating vanadium from vanadium-titanium magnetite into titanium slag is the high recovery rate of vanadium, that is, the recovery rate of vanadium from vanadium-titanium slag can reach more than 90%, but in the process of industrialization, we found that In order to allow vanadium to enter the slag phase, it must be ensured that the slag contains high iron oxide (FeO), which leads to a low recovery rate of metallic iron. More serious, additional protective measures for the furnace lining are required
Moreover, due to the low vanadium content in the slag (2% to 2.5% V 2 o 5 ), so the processing capacity is very large, leading to separate treatment and recovery of vanadium and titanium from vanadium-titanium slag, which is technically difficult. In addition, the remaining titanium slag after vanadium extraction cannot be directly used as titanium dioxide raw materials, and it needs to be re-reduced Further processing can be used as a raw material for titanium extraction, which increases cost and energy consumption

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  • Method for recovering vanadium, titanium and iron from vanadium titanium magnetite

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Experimental program
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Effect test

Embodiment 1

[0026] Vanadium-titanium magnetite composition: TFe56%, TiO 2 12.5%, V 2 o 5 0.64%. Particle size-100 mesh, 100%, use <1mm anthracite coal powder, fixed carbon 80.29%, volatile matter 6.96%, ash content 11.62%, sulfur content 0.54%. Raw material ratio is: iron ore: coal powder: syrup=100:24:7. After mixing, use a powder tablet press to press into a block shape of 35×30×25mm without drying, and put the block material on the rotary hearth furnace pan through a distributor, with a thickness of 5-6cm.

[0027] The rotary hearth furnace is heated with gas, the maximum temperature is 1350°C, after 20 minutes, a metallized block with a metallization rate > 90% is obtained. The blocks are continuously melted into the electric furnace, and the temperature of the electric furnace is controlled at 1500-1600 ° C. After heating, they are quickly melted to obtain vanadium-containing molten iron and titanium slag. Titanium slag and vanadium-containing molten iron are regularly discharge...

Embodiment 2

[0029] Vanadium-titanium magnetite composition: Tfe57.5%, TiO 2 13.5%, V 2 o 5 0.59%. Particle size-below 100 orders, with <1mm anthracite coal powder, raw material ratio is: iron ore: coal powder: polyvinyl alcohol aqueous solution (concentration 3%)=100:24:6. After mixing, use a powder tablet press to press into Ф25mm balls, dry at 80°C for 1 hour, and the water content of the pellets is less than 1%. The dried balls are loaded into the rotary hearth furnace through a distributor, with a thickness of 4-5cm.

[0030] The rotary hearth furnace is heated with gas, the maximum temperature is 1350°C, and after 15 minutes, a metallized block with a metallization rate > 90% is obtained. The block enters the electric furnace at about 1200°C. The temperature of the electric furnace is controlled at 1550-1650°C, and it is quickly melted to obtain Vanadium-containing molten iron and titanium slag with black titanite as the main titanium-containing phase, titanium slag and vanadium-c...

Embodiment 3

[0032] Vanadium-titanium magnetite composition: Tfe54.5%, TiO 2 11.8%, V 2 o 5 0.55%. Below particle size-100 order, use<1mm anthracite coal powder, raw material ratio is: iron ore: coal powder: carboxymethyl cellulose aqueous solution (concentration 2%)=100:24:7. After mixing, use a powder tablet press to press into a block of 35×25×25mm, and dry it naturally in the air for 12 hours. The water content of the pellet is less than 1%. Thickness 4~5cm,.

[0033] The rotary hearth furnace is heated with gas, the maximum temperature is 1370°C, and the metallized block with a metallization rate > 90% is obtained after 15 minutes. The block enters the electric furnace at about 1200°C. The temperature of the electric furnace is controlled at 1550-1600°C, and it is quickly melted to obtain Vanadium-containing molten iron and titanium slag with black titanite as the main titanium-containing phase, titanium slag and vanadium-containing molten iron are regularly discharged into ladles...

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Abstract

The invention discloses a method for recovering vanadium, titanium and iron from vanadium titanium magnetite, comprising the following steps: using mineral powder, coal dust and binder together for agglomeration, reducting the mineral powder in a rotary hearth furnace to obtain a metallized product, then placing the product in an electric furnace by hot charging for melting and separating and obtaining titanium slag containing more than 50% of vanadium-bearing molten iron and TiO2. Vanadium slag is obtained by blowing vanadium in the vanadium-bearing molten iron, semisteel is used to make steel in a converter and the titanium slag can be used as raw material for extracting titanium directly. The method of the invention has high reduction temperature for vanadium titanium magnetite, short time, environmentally friendly, simple process and high yield of vanadium, titanium and iron so as to reach the aim of the comprehensive recovery and application of vanadium, titanium and iron and have good economic benefit and social benefit.

Description

technical field [0001] The invention relates to a method for recovering vanadium-titanium iron from vanadium-titanium magnetite, in particular to a method for obtaining vanadium-containing molten iron and titanium slag by using coal-based direct reduction-electric furnace melting and separation. Background technique [0002] At present, the traditional industrialized treatment of vanadium-titanium magnetite at home and abroad has the following several processes: [0003] 1. Blast furnace-converter smelting process. Companies that use blast furnaces to smelt vanadium-titanium magnetite include Nizhny Tagil Iron and Steel Company, Qiusov Iron and Steel Works, Panzhihua Iron and Steel Company, and Chengde Iron and Steel Company. In this process, vanadium is reduced into molten iron through blast furnace, and then vanadium is oxidized by converter blowing to obtain vanadium slag. It is then smelted into steel in a converter. The problem reflected in the industrialization of t...

Claims

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Application Information

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IPC IPC(8): C21B13/08C22B1/14C21C5/30C22B34/22
CPCY02P10/20
Inventor 陈厚生秦廷许范先国李家权
Owner SICHUAN LOMON MINING & METALLURGY
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