Method for preparing iron and separating vanadium and titanium from vanadium titano-magnetite through calcium-free low-temperature reduction

A vanadium-titanium magnetite and separation method technology, applied in the direction of improving process efficiency, etc., can solve problems such as erosion, unsuitable use, and lower economic efficiency, and achieve the effects of reducing smelting sulfur load, reducing coal powder consumption, and reducing costs

Active Publication Date: 2021-10-08
钢研晟华科技股份有限公司 +1
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Problems solved by technology

The advantage of the rotary kiln reduction method is that the pre-reduction rate is high, but the production capacity is low and the energy consumption is high
The shaft furnace reduction method is suitable for countries with rich natural gas resources and relatively low prices. In my country, natural gas resources are scarce and the price is high, so it is not suitable for use.
The rotary hearth furnace has been used in the pre-reduction test of vanadium-titanium magnetite in the last 10 years, but the special atmosphere of the rotary hearth furnace makes it difficult to obtain pellets with a high metallization rate, which increases the energy consumption and cost of smelting in the electric furnace, especially for Erosion of the refractory material of the electric furnace, the process is difficult to continue smoothly, and several large-scale test equipment have stopped testing
The problem brought by the tunnel kiln sodium reduction method is that the use of silicon carbide is only a few times, the production cost is too high, and the volatilized alkali is also extremely corrosive to the refractory materials of the tunnel kiln; The consumption is too high, and the coal consumption of one ton of metal iron reduction reaches more than 1000 kg, and more than 6GJ of gas supplementary heating is required, which further reduces the economical efficiency of the technology
This process has been tried in many domestic units, but failed to produce

Method used

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  • Method for preparing iron and separating vanadium and titanium from vanadium titano-magnetite through calcium-free low-temperature reduction
  • Method for preparing iron and separating vanadium and titanium from vanadium titano-magnetite through calcium-free low-temperature reduction
  • Method for preparing iron and separating vanadium and titanium from vanadium titano-magnetite through calcium-free low-temperature reduction

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Effect test

Embodiment 1

[0068] This embodiment provides a calcium-free low-temperature reduction of vanadium-titanium magnetite to prepare iron and vanadium-titanium separation method, using the above-mentioned method, the process flow diagram is as follows figure 1 shown. The specific details are as follows:

[0069] The vanadium-titanium-magnetite powder (particle size: 50-100 mesh) used in this example has main components shown in Table 1. Coal powder for reducing agent is shown in Table 2, and the binder is an organic binder, such as waste syrup.

[0070] Vanadium-titanium-magnetite powder, coal powder, and binder are mixed according to the mass ratio of 100:20:3, mixed, and cold-pressed to obtain pellets. The pellets are ellipsoids with a particle size of 30-50mm. Dry on a continuous dryer, the drying air temperature is 300°C, stay for 30min, and the moisture content of the pellets is 1.8%.

[0071] The pellets enter the indirect heating reduction device for reduction, the thickness of the ma...

Embodiment 2

[0081] This embodiment provides a calcium-free low-temperature reduction of vanadium-titanium magnetite to prepare iron and vanadium-titanium separation method, using the above-mentioned method, the process flow diagram is as follows figure 2 shown. The specific details are as follows:

[0082] The vanadium-titanium-magnetite powder (particle size: 50-100 mesh) used in this example has main components shown in Table 1. The coal powder used as the reducing agent is shown in Table 2, and the binder is an organic binder, such as sodium carboxymethylcellulose.

[0083] Vanadium-titanium-magnetite powder, carbonaceous reducing agent, and binder are mixed according to the mass ratio of 100:22:3, mixed, and cold-pressed to obtain pellets. The pellets are ellipsoids with a particle size of 30-50mm. Dry on a continuous dryer, the drying air temperature is 300°C, stay for 30min, and the moisture content of the pellets is 1.8%.

[0084] The pellets enter the indirect heating reductio...

Embodiment 3

[0087] This embodiment provides a calcium-free low-temperature reduction of vanadium-titanium magnetite to prepare iron and vanadium-titanium separation method, using the above-mentioned method, the process flow diagram is as follows image 3 shown. The specific details are as follows:

[0088] Vanadium-titanium magnetite powder, reducing agent and binding agent addition, mixing, ball pressing, drying and reduction parameters are the same as in Example 1.

[0089] The metallized pellets obtained after the reduction of the pellets are cooled and refined to a finer size of 100 mesh or less, and the slag and iron are separated by a magnetic separator.

[0090] The obtained iron powder is subjected to indirect drying (300°C, 30min) to control the water content below 3% and dehydrate to obtain metal iron powder with 93% total iron and 0.25% V, and cold press the metal iron powder into direct reduced iron nuggets. Add to converter, electric furnace or blast furnace.

[0091] The ...

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Abstract

The invention discloses a method for preparing iron and separating vanadium and titanium from vanadium titano-magnetite through calcium-free low-temperature reduction, belongs to the technical field of comprehensive utilization of the vanadium titano-magnetite, and solves the problem that the recovery rate of vanadium and titanium is low in an existing method for reducing the vanadium titano-magnetite. The method comprises the steps that vanadium titano-magnetite powder, a carbonaceous reducing agent and a binding agent are evenly mixed and then subjected to cold press molding, pellets are obtained, the pellets are dried and then put into an indirect heating reduction device to be heated and reduced, metallized pellets are obtained, the reaction temperature ranges from 1000 DEG C to 1150 DEG C, and the time ranges from 20 min to 80 min; the metalized pellets are discharged and charged into a melt separation electric furnace, and the metalized pellets are melted to separate molten iron and slag; the slag is refined and then leached in dilute sulphuric acid, ferric sulfate, aluminum sulfate and V2O5 are dissolved into a solution, and after solid-liquid separation, the solid is titanium-containing slag; and after precipitating vanadium, filtering, precipitating iron, carrying out solid-liquid separation, precipitating aluminum, and carrying out solid-liquid separation, evaporative crystallization is carried out on residual filtrate to obtain anhydrous sodium sulphate. By means of the method, green and efficient utilization of vanadium, titanium and iron of the vanadium titano-magnetite can be achieved with low coal consumption.

Description

technical field [0001] The invention relates to the technical field of comprehensive resource utilization of vanadium-titanium magnetite, in particular to a calcium-free low-temperature reduction of vanadium-titanium magnetite to prepare iron and a method for separating vanadium and titanium. Background technique [0002] Vanadium-titanium magnetite is an important mineral resource in my country. After decades of research, it can be recycled by blast furnace. However, the grade of titanium-containing slag after blast furnace treatment of vanadium-titanium magnetite is only about 20%, and the titanium-containing slag is not easy to use. In addition, the comprehensive recovery rate of vanadium is only 70% to 80%. [0003] Since the last century, domestic and foreign research on the pre-reduction + electric furnace melting method of vanadium-titanium magnetite has been carried out. The pre-reduction methods include rotary kiln reduction method, shaft furnace reduction method, an...

Claims

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Application Information

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IPC IPC(8): C21B13/00C22B1/24C22B7/04C22B34/12C22B34/22
CPCC21B13/0006C21B13/0066C22B7/04C22B7/007C22B34/22C22B34/125C22B1/2406Y02P10/20
Inventor 郭培民孔令兵王磊林万舟周强
Owner 钢研晟华科技股份有限公司
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