Solid phase reinforcement reduction-magnetic separation method of vanadium titano-magnetite

A technology for vanadium titanomagnetite and magnetic separation separation, which is applied in the fields of magnetic separation, solid separation, chemical instruments and methods, etc., can solve the problem of immature direct reduced iron technology, restricting the development of electric furnace steelmaking, and low iron metallization rate. To achieve the effect of strengthening the direct reduction process, reducing the activation energy of the reaction, and promoting the growth of iron grains

Inactive Publication Date: 2013-04-03
NORTHEASTERN UNIV
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AI Technical Summary

Problems solved by technology

[0004] Direct reduction of iron is a process of smelting iron ore into iron through solid-state reduction at a temperature lower than the melting temperature of the ore. Due to the immature technology of direct reduction of iron in China, the metallization rate of iron is not high, and the production cost is high. The domestic output is only about 400,000 tons, which is far lower than the foreign output of more than 70 million tons, which seriously restricts the development of electric furnace steelmaking and other industries.

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  • Solid phase reinforcement reduction-magnetic separation method of vanadium titano-magnetite
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  • Solid phase reinforcement reduction-magnetic separation method of vanadium titano-magnetite

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Experimental program
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Effect test

Embodiment 1

[0022] (1) Mix the vanadium-titanium magnetite and anthracite powder according to the ratio of C / O molar ratio of 1.1:1, mix them in a ball mill, and add the additive Fe which accounts for 7% of the mass of the mixture into the mixed material. 2 O 3 , After mixing, add 0.1% of the binder polyethylene glycol, which accounts for the mass of the mixture, and mold it into a cylindrical sample under a pressure of 40MPa;

[0023] (2) Embed the cylindrical sample in a crucible containing anthracite powder, and reduce it at 1100°C for 120 minutes to obtain reduced iron powder;

[0024] (3) Quench the reduced iron powder to room temperature, and grind the reduced product to 100-300 mesh with a 2M2-100 sealed sample preparation pulverizer to obtain the ground reduced iron powder with a metallization rate of 86.53%;

[0025] (4) The ground reduced iron powder is magnetically separated at a magnetic separation intensity of 200kA / m to obtain an iron powder with a recovery rate of 96.12%. The magne...

Embodiment 2

[0027] (1) Mix the vanadium-titanium magnetite and anthracite powder in a C / O molar ratio of 1.4:1, mix them in a ball mill, and add 3% of the additive Na, which accounts for the mass of the mixture, to the mixed material. 2 CO 3 , After mixing, add 0.2% of the binder polyethylene glycol, which accounts for the mass of the mixture, and mold it into a cylindrical sample under a pressure of 60MPa;

[0028] (2) Embed the cylindrical sample in a crucible containing anthracite powder, and reduce it at 1350°C for 60 minutes to obtain reduced iron powder;

[0029] (3) Naturally cool the reduced iron powder to room temperature, and grind the reduced product to 100-300 mesh with a 2M2-100 sealed sample preparation pulverizer to obtain finely ground reduced iron powder;

[0030] (4) Magnetic separation of the ground reduced iron powder at a magnetic separation intensity of 120kA / m, to obtain iron powder with a recovery rate of 94.82%.

[0031] Among the magnetic products: TFe is 89.50%, MFe is 8...

Embodiment 3

[0033] (1) Mix the vanadium-titanium magnetite and anthracite powder according to the ratio of C / O molar ratio of 1.2:1, mix them in a ball mill, and add 3% of the additive CaF to the mixed material. 2 , After mixing, add 0.15% of the binder polyethylene glycol of the mass of the mixture, and mold it into a cylindrical sample under a pressure of 50MPa;

[0034] (2) Embed the cylindrical sample in a crucible containing anthracite powder, and reduce it at 1300°C for 30 minutes to obtain reduced iron powder;

[0035] (3) Naturally cool the reduced iron powder to room temperature, and grind the reduced product to 100-300 mesh with a 2M2-100 sealed sample preparation pulverizer to obtain finely ground reduced iron powder with a metallization rate of 89.68%;

[0036] (4) The ground reduced iron powder is magnetically separated at a magnetic separation intensity of 160kA / m to obtain iron powder with a recovery rate of 94.37%. The ore phase diagram is as follows figure 2 As shown, in the mag...

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Abstract

The invention belongs to the non-blast furnace smelting field of vanadium titano-magnetite, and specifically relates to a solid phase reinforcement reduction-magnetic separation method of the vanadium titano-magnetite. The method comprises the steps of mixing the vanadium titano-magnetite and anthracite duff, adding additives of CsF2, Na2CO3 or Fe2O3, mixing the above materials uniformly, adding a binding agent, mold pressing into a cylindrical sample, reducing the cylindrical sample for 30-120 min at a temperature of 1,100-1,400 DEG C to obtain reduced iron powder, cooling the reduced iron powder by water quenching or naturally cooling to a room temperature, grinding fine, and magnetic separating to obtain iron powder with a recovery rate of 94-97%. The method is simple in operation, reduces energy consumption and saves cost by replacing coke by the anthracite, and promotes growth of iron crystals after adding CsF2, Fe2O3 and Na2CO3, thereby increasing metallization ratio. At the same time, the method facilitates slag-iron separation. Water quenching after reduction can prevent the reduced metal iron and iron suboxide from being re-oxidized into iron oxide, enabling the metallization ratio to be between 86%-98% and the iron recovery rate to reach 94-97%.

Description

Technical field [0001] The invention belongs to the field of non-blast furnace smelting of vanadium-titanium magnetite, and specifically relates to a method for solid-phase enhanced reduction-magnetic separation of vanadium-titanium magnetite. Background technique [0002] There are more than 40 billion tons of vanadium-titanium magnetite identified in the world, mainly distributed in China, Russia, the United States, South Africa, Canada and other countries. my country is rich in vanadium-titanium magnetite resources, which are mainly distributed in Panxi and Chengde areas. The proven prospective reserves in Panxi area exceed 10 billion tons, and the proven reserves in Chengde area exceed 8 billion tons. [0003] Vanadium-titanium magnetite is a multi-element symbiotic ore, mainly iron, vanadium, titanium, and accompanied by chromium, diamond, nickel, copper, anti-, gallium and platinum group elements and other valuable elements, so vanadium-titanium magnet Mining smelting can no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/015C22B1/02
Inventor 薛向欣姜涛余少武夏溢段培宁
Owner NORTHEASTERN UNIV
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