A method for porous media adsorption and separation of vanadium resources in vanadium slag

A porous medium, adsorption and separation technology, applied in the direction of improving process efficiency, etc., can solve the problems that the solid phase of vanadium-containing spinel in the vanadium slag can not be separated by high gravity, high requirements for high gravity equipment, etc., to solve the problem of comprehensive utilization, The effect of less environmental pollution and simple process operation

Active Publication Date: 2019-07-02
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

ZL201310416429.4 proposes a method of separating and enriching vanadium resources in vanadium slag by using supergravity method. This method uses supergravity treatment for heat-treated vanadium slag under high temperature (1200-1300℃) conditions, which requires extremely high supergravity equipment. No related industrial equipment
At the same time, this method has the hidden danger of liquid vanadium slag solidifying in the centrifugal equipment during the high-gravity treatment process, which will cause the failure of high-gravity separation of the vanadium-containing spinel solid phase in the vanadium slag.

Method used

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  • A method for porous media adsorption and separation of vanadium resources in vanadium slag
  • A method for porous media adsorption and separation of vanadium resources in vanadium slag
  • A method for porous media adsorption and separation of vanadium resources in vanadium slag

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preparation example Construction

[0029] (1) Preparation and treatment of porous media plates

[0030] Preparation method 1: crush quicklime or limestone and then sieve to obtain particles with a size between 10 and 60 meshes, and then briquette to obtain a thick porous medium plate, and heat the medium plate to 600-1200 in a heating furnace. ℃ and keep warm. The thickness of the porous medium plate is 60-150 mm, and the hole diameter is 30-80 microns.

[0031] Preparation method 2: crush quicklime or limestone and then sieve to obtain particles with a size between 10 and 60 meshes, and then briquetting to obtain a thin porous medium plate at room temperature, which is stored at room temperature for later use. The thickness of the porous medium plate is 20-60 millimeters, and the hole diameter is 60-100 microns.

[0032] (2) Selective precipitation and growth of vanadium-rich phase in vanadium slag

[0033] In order to ensure efficient adsorption and separation of vanadium-containing slag, it is first neces...

Embodiment 1

[0040] A vanadium-containing steel slag, after testing, its chemical composition is: 6.8% CaO, 20.5% SiO 2 , 1.2% Al 2 O3, 5.8% MgO, 8.2% MnO, 3.5% TiO2, 8.5% V2O5, total iron is 32.2%. The molten vanadium slag at a temperature of 1560°C is poured into an electric furnace for heat treatment of vanadium slag under the atmosphere, and at the same time, 1% of the mass of vanadium slag is added with sodium carbonate flux, and the temperature is kept for 20 minutes to ensure that the temperature distribution of the components is even. Then cool to 1240° C. at a cooling rate of 2° C. / min and hold the temperature for 30 minutes to obtain heat-treated molten vanadium slag containing solid-phase vanadium-iron spinel. After the heat treatment of the vanadium slag is completed, the obtained vanadium slag is poured onto a porous lime medium plate heated to 1000° C. for adsorption by means of drainage. The thickness of the porous lime medium plate is 100 mm. After the adsorption and sepa...

Embodiment 2

[0042] A vanadium-containing steel slag has been tested and its chemical composition is: 5.7% CaO, 21.4% SiO2, 1.1% Al2O3, 6.2% MgO, 8.6% MnO, 3.8% TiO2, 7.9% V2O5, and 29.8% total iron. The molten vanadium slag at a temperature of 1570° C. is poured into an electric furnace for heat treatment of vanadium slag in an atmospheric atmosphere, and at the same time, 0.8% boron trioxide flux by mass of the vanadium slag is added, and the temperature is kept for 20 minutes to ensure that the temperature distribution of the components is even. Then, it was cooled to 1230° C. at a cooling rate of 1.8° C. / min and held for 30 minutes to obtain heat-treated molten vanadium slag containing solid-phase vanadium-iron spinel. After the heat treatment of the vanadium slag is completed, the obtained vanadium slag is poured onto a normal temperature porous lime medium plate with a thickness of 50 mm for adsorption by means of drainage. Spinel fine vanadium slag (the grade of vanadium-iron spinel...

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Abstract

The invention discloses a method for adsorbing and separating vanadium resources in vanadium slag by porous media, and belongs to the field of metallurgical slag solid-liquid two-phase separation. The method for adsorbing and separating the vanadium resources in the vanadium slag by the porous media comprises the following steps that 1, a porous medium plate is prepared; 2, the molten vanadium slag is cooled from the temperature of 1500-1550 DEG C to 1200-1250 DEG C at a cooling rate of less than 2 DEG C / min, and a heat-treated molten vanadium slag containing solid-phase vanadium-iron spinel is obtained; and 3, absorbing for the heat-treated molten vanadium slag is conducted by the porous medium plate to finish solid-liquid separation, and fine vanadium slag with the vanadium-iron spinel phase grade being 70-90% and tailings are obtained. According to the method for absorbing and separating the vanadium resources in the vanadium slag by the porous media, the fusion slag phase in the heat-treated vanadium slag is absorbed by capillary force of the porous medium plate, separation and enrichment of the vanadium-iron spinel solid-phase in the heat-treated vanadium slag are achieved, the vanadium-iron spinel fine vanadium slag separated through the porous media can be directly used as raw materials of hydrometallurgical vanadium extraction and pyrometallurgy of vanadium-iron, and the porous medium plate for absorbing the tailings can serve as raw materials of cement production.

Description

technical field [0001] The invention belongs to the field of solid-liquid two-phase separation of metallurgical slag, and in particular relates to a method for separating vanadium resources in vanadium slag by adopting porous media adsorption. Background technique [0002] Most of the vanadium resources come from vanadium-titanium magnetite. The vanadium-titanium magnetite is smelted in the blast furnace after beneficiation to obtain titanium slag and molten iron containing about 0.3% vanadium. The molten iron containing vanadium is oxidized by converter blowing to obtain 2 o 5 of vanadium slag. [0003] Currently, vanadium or V is produced from vanadium-containing steel slag 2 o 5 The main method is to use vanadium slag crushing, oxidation roasting, leaching to remove impurities, vanadium precipitation and filtration to obtain the intermediate product ammonium vanadate, and the ammonium vanadate is then processed to obtain different vanadium products. The vanadium grad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B34/22
CPCC22B7/005C22B7/04C22B34/22Y02P10/20
Inventor 肖赛君丁龙刘国龙吴六顺章俊
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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