A method for controlling the crystallization phase of molten titanium slag

A titanium slag and melting technology, which is applied in the fields of metallurgical technology and mineral resource processing, can solve the problems of unfavorable crystallization phase for titanium upgrading, low monomer dissociation degree, and difficult removal, etc., to achieve large grain size, titanium slag The effect of quality improvement and high quality

Active Publication Date: 2019-07-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

CN101781717B discloses a method for separating and extracting titanium-rich compounds from titanium-containing slag, using SiO 2 / P 2 o 5 Isoacid oxide modified TiO 2 Titanium slag with a content of 15-60% precipitates black titanite as a titanium-rich phase in the temperature range of 1300-1200 ° C, but the obtained black titanite phase is in the shape of thin strips of a few microns, and the degree of monomer dissociation is low
Third, relying on the addition of acidic oxides to promote the precipitation of black titanite introduces more impurity components that are difficult to acidolyze and remove, which is not conducive to the control of crystallization phase and the subsequent upgrading of titanium extraction

Method used

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  • A method for controlling the crystallization phase of molten titanium slag
  • A method for controlling the crystallization phase of molten titanium slag
  • A method for controlling the crystallization phase of molten titanium slag

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Experimental program
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Effect test

Embodiment 1

[0054] (1) According to the mass percentage, the composition of the titanium slag is adjusted to be TiO 2 52%, MgO 7%, Al 2 o 3 8%, graphite 5.2%; the titanium slag also contains FeO x 4%, SiO 2 15.9%, CaO 7.9%;

[0055] (2) Use the titanium slag regulated in step (1) as raw material, heat it to 1600°C for high temperature melting, keep it warm for 1.8h, then cool it down to 1400°C at a rate of 10°C / min, water cooling and quenching to obtain crystallization and melting titanium slag .

[0056] The morphology of the molten titanium slag was observed under a scanning electron microscope, such as figure 1 As shown, the slag only contains two phases of glass phase and black titanite, black titanite is the only titanium-rich phase, the structure is compact, and the interface with the glass phase is regular and round, and the weighted average particle size of black titanite is 57 μm. Using EDS to test the chemical composition of the titanium-rich phase of the molten titaniu...

Embodiment 2

[0059] (1) According to the mass percentage, the composition of the titanium slag is adjusted to be TiO 2 52%, MgO 14%, Al 2 o 3 12%, graphite 4.2%; the titanium slag also contains FeO x 5%, SiO 2 8.5%, CaO 4.3%;

[0060] (2) Using the titanium slag regulated in step (1) as raw material, heat it to 1600°C for high temperature melting, keep it warm for 0.5h, then cool it down to 1400°C at a rate of 15°C / min, water cooling and quenching to obtain crystallization and melting titanium slag .

[0061] The morphology of the molten titanium slag was observed under a scanning electron microscope, such as figure 2 As shown, the slag only contains two phases of glass phase and black titanite, and black titanite is the only titanium-rich phase with a compact structure, and the interface with the glass phase is regular and round. The weighted average particle size of black titanite is 76 μm. Using EDS to test the chemical composition of the titanium-rich phase of the molten tita...

Embodiment 3

[0064] (1) According to the mass percentage, the composition of the titanium slag is adjusted to be TiO 2 60%, MgO 6%, Al 2 o 3 5%, graphite 4%; the titanium slag also contains FeO x 8%, SiO 2 11.3%, CaO 5.7%;

[0065] (2) Use the titanium slag regulated in step (1) as raw material, heat it to 1650°C for high temperature melting, keep it warm for 1.0h, then cool it down to 1450°C at a rate of 10°C / min, and air-cool and quench to obtain crystallization and melting titanium slag .

[0066] The morphology of the molten titanium slag was observed under a scanning electron microscope, such as image 3As shown, the slag only contains two phases of glass phase and black titanite, black titanite is the only titanium-rich phase, the structure is compact, and the interface with the glass phase is regular and round, and the weighted average particle size of black titanite is 61 μm. Using EDS to test the chemical composition of the titanium-rich phase of the molten titanium slag,...

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Abstract

The invention relates to a method for adjusting and controlling a melt separation titanium slag crystallization phase. According to the method, the components of titanium slag are adjusted and controlled to comprise, by weight, 40-70% of TiO2, 4-18% of MgO, 4-18% of Al2O3 and a reducer, wherein the weight ratio of the reducer to TiO2 is 0.01-0.15; and the titanium slag is heated to be melted, after complete reacting, the temperature is decreased to be 1300-1500 DEG C at the speed rate of 0.1-20 DEG C / min for quenching treatment so as to obtain the melt separation titanium slag. According to the method for adjusting and controlling the melt separation titanium slag crystallization phase, through adjusting and controlling over the components and controlling over the crystallization process,anosovite becomes a sole precipitated phase of the melt separation titanium slag, the TiO2 grade of an anosovite titanium-rich phase in the melt separation titanium slag is high, the grain size is large, the mineral phase structure is compact, the single separation degree is high, and after subsequent treatment, the high-grade titanium slag with the TiO2 grade being 76% or above can be obtained. According to the method for adjusting and controlling the melt separation titanium slag crystallization phase, the requirement of a sulfate process titanium dioxide technique for the titanium slag grade is met, and the method is suitable for industrialized application.

Description

technical field [0001] The invention relates to the fields of metallurgical technology and mineral resource processing, in particular to a method for controlling the crystallization phase of molten titanium slag. Background technique [0002] my country is rich in vanadium-titanium-magnetite resources, especially in the Xichang area of ​​Panzhihua, where the reserves of titanium resources account for about 35% of the world's total reserves. Panxi vanadium-titanium magnetite mainly contains Fe, Ti, and V elements, and the TiO produced by the existing blast furnace smelting process 2 It is very difficult to reuse titanium in the blast furnace titanium slag with a content of 22-25%, resulting in a waste of 50% of titanium resources in Panxi. For the comprehensive utilization of titanium-containing blast furnace slag, CN1253185A discloses a method for separating titanium components from titanium-containing slag, that is, to create conditions to enrich titanium dispersed in mult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B34/12
CPCC22B7/001C22B7/04C22B34/1218Y02P10/20
Inventor 王珍朱庆山孙昊延
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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