Method of producing high-strength artificial rutile from ilmenite

A technology of artificial rutile and ilmenite, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problems of easy pulverization and low strength of artificial rutile, achieve low proportion of fine powder, realize large-scale continuous production, The effect of low energy consumption

Active Publication Date: 2018-09-28
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem that the artificial rutile produced by the prior art has low strength and is easy to pulverize

Method used

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  • Method of producing high-strength artificial rutile from ilmenite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This embodiment selects the main component of ilmenite: TiO 2 : 46.76%, FeO: 35.59%, Fe 2 o 3 : 5.12%, MgO: 6.62%, CaO: 1.03%, SiO 2 : 4.56%, Al 2 o 3 : 1.26%; its particle size distribution is between 60 and 200 meshes, and the average particle size is 185 μm; the specific preparation steps are as follows:

[0062] A, the ilmenite is oxidized and roasted at 1000° C. for 1 hour in an air atmosphere in a fluidized bed to obtain an oxidized ore with an oxidation rate of 95%;

[0063] B. The oxidized ore is reduced and roasted at 750° C. for 1 hour under coke oven gas in a fluidized bed to obtain a reduced ore with a reduction rate of 92%;

[0064] C. The reduced ore is oxidized and roasted at 1000° C. for 0.2 h in an air atmosphere in a fluidized bed to obtain a re-oxidized ore with an oxidation rate of 87%;

[0065] D, leaching the reoxidized ore with 20% by weight hydrochloric acid in a reactor with strong stirring (500r / min) with a liquid-solid ratio of 4:1 (L / kg...

Embodiment 2

[0069] This embodiment selects the main component of ilmenite: TiO 2 : 47.8%, FeO: 37.81%, Fe 2 o 3 : 3.66%, MgO: 6.28%, CaO: 0.83%, SiO 2 : 2.32%, Al 2 o 3 : 1.23%; its particle size distribution is between 60 and 200 meshes, and the average particle size is 194 μm; the specific preparation steps are as follows:

[0070] A, the ilmenite is oxidized and roasted at 950° C. for 1.5 hours in an air atmosphere in a fluidized bed to obtain an oxidized ore with an oxidation rate of 93%;

[0071] B. The oxidized ore is reduced and roasted at 800°C for 0.5h under coke oven gas in a fluidized bed to obtain a reduced ore with a reduction rate of 91%;

[0072] C. The reduced ore is oxidized and roasted at 950° C. for 0.3 h under an air atmosphere in the fluidized bed to obtain a re-oxidized ore with an oxidation rate of 82%;

[0073] D, leaching the reoxidized ore with 20% by weight hydrochloric acid in a flask with strong stirring (500r / min) with a liquid-solid ratio of 4:1 (L / kg)...

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Abstract

The invention discloses a method of producing high-strength artificial rutile from ilmenite and belongs to the technical field of metallurgy. In order to solve the problem that artificial rutile has low strength and powdering proneness, the invention provides a method of producing high-strength artificial rutile from ilmenite; the artificial rutile is produced by subjecting ilmenite to high-temperature oxidation before weak reduction, high-temperature secondary oxidation, acid leaching, alkali leaching, and calcining. The method has the advantages that microscopic composition and morphology ofilmenite are changed through the pretreatment of high-temperature oxidation, weak reduction and high-temperature secondary oxidation for ilmenite, ilmenite is imparted good reaction activity and mechanical force resistance in the subsequent acid leaching and alkali leaching cleaning process, titanium recycle rate is increased to 98% and above, the product quality is high, the content of TiO2 is higher, particle size is kept better, and fine power ratio is lower.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing high-strength artificial rutile from ilmenite. Background technique [0002] Boiling titanium dioxide chloride is the current development trend of the world's titanium dioxide industry. Compared with sulfuric acid titanium dioxide, it is more advanced, but it has more stringent requirements on raw materials. As the most abundant titanium resource in the world, ilmenite cannot be directly used as a raw material for boiling chlorination because most of it has high content of impurities such as iron, calcium, magnesium, and silicon, and generally needs to be upgraded. Therefore, using ilmenite as raw material to prepare artificial rutile raw material for boiling chlorination has always been the focus of development in the field of titanium industry. [0003] Among the various methods that have been proposed to prepare artificial rutile from il...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047
CPCC01G23/0475C01P2004/60C01P2004/61C01P2006/80
Inventor 张溅波叶恩东
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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