Method for preparing titanium-rich material by directly reducing molten slag from vanadium-titanium-ferrum concentrate

A technology of vanadium-titanium iron concentrate and melting slag, which is applied in the direction of improving process efficiency, can solve the problems of long production time, large acid consumption and small dosage of titanium dioxide, and achieve TiO2 grade improvement, improved utilization effect, Effects of low calcium and magnesium content

Active Publication Date: 2012-11-21
盐城捷晶科技有限公司
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  • Abstract
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Problems solved by technology

However, there are some problems in the above-mentioned existing technology of producing titanium dioxide by using melting slag: as the batching of titanium dioxide produced by sulfuric acid method, the amount of acid consumption for producing titanium dioxide is too large, and the treatment technology for waste acid Limited, and this method produces a large amount of ferrous sulfate (production of one ton of titanium dioxide produces about 3 to 5 tons of ferrous sulfate), currently the use of ferrous sulfate is narrow and the amount is small, and there are many problems in its treatment
The only Canadian QIT company abroad that has mastered the technology of upgrading titanium slag to remove calcium and magnesium is basically unwilling to transfer its technology, and its key technical links are also difficult to master. Even if QIT company is willing to transfer, it still needs to pay expensive technology transfer fees
Moreover, this technology has disadvantages such as long process, long production time, high energy consumption, complicated operation, and high cost, which greatly limits the wide application of the product, and on the one hand, this production process may not be suitable for the upgrading of titanium slag in my country

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  • Method for preparing titanium-rich material by directly reducing molten slag from vanadium-titanium-ferrum concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The vanadium-titanium-iron concentrate used in the present embodiment directly reduces slag 500g, wherein TiO 2 The FeO content is 50.5%, the FeO content is 4.5%, the MgO content is 10.3%, and the CaO content is 12.7%. Grinding with a ball mill (the ratio of ball to material is 5:1) and sieving with a set of sieves to obtain the raw material of vanadium-titanium-iron concentrate with a particle size of 75-1000um for direct reduction of slag. The temperature is 800°C, the oxidation time is 35 minutes, and the oxidation atmosphere is 99% oxygen for oxidation modification. Then the acid leaching residue was obtained by acid leaching under the conditions of hydrochloric acid concentration of 10%, acid leaching temperature of 50°C, acid leaching time of 30 minutes, liquid-solid phase mass ratio of 8:1, and stirring speed of 5 rpm. The acid leaching residue is obtained by alkaline leaching under the conditions of sodium hydroxide concentration of 12mol / L, alkali leaching tem...

Embodiment 2

[0042] The vanadium-titanium-iron concentrate used in the present embodiment directly reduces slag 500g, wherein TiO 2 The FeO content is 49.6%, the FeO content is 11.6%, the MgO content is 11.5%, and the CaO content is 13.1%. Grinding with a ball mill (the ball-to-material ratio is 7:1) and sieving with a sieve to obtain the vanadium-titanium-iron concentrate with a particle size of 75-1000um as the raw material for direct reduction of slag. The temperature is 800°C, the oxidation time is 35 minutes, and the oxidation atmosphere is 99% oxygen for oxidation modification, wherein the supplementary oxygen amount is 3 ml / min. After oxidative modification, it is sent to a laboratory tube furnace, and CO with a concentration of 95% is introduced to reduce the oxidation slag for 25 minutes under the condition of 750 ° C and the amount of carbon monoxide added at 5 ml / min to obtain modified slag. The modified slag was acid leached under the conditions of hydrochloric acid concentrat...

Embodiment 3

[0044] The vanadium-titanium-iron concentrate used in the present embodiment directly reduces slag 500g, wherein TiO 2 The FeO content is 51.2%, the FeO content is 3.3%, the MgO content is 10.1%, and the CaO content is 11.3%. Grinding with a ball mill (the ratio of ball to material is 8:1) and sieving with a set of sieves to obtain the raw material of vanadium-titanium-iron concentrate with a particle size of 75-1000um for direct reduction of slag. The temperature is 950°C, the oxidation time is 35 minutes, and the oxidation atmosphere is 99% oxygen for oxidative modification, and the amount of oxygen added during the modification process is 5 ml / min. After oxidative modification, the acid leaching residue was obtained by acid leaching under the conditions of hydrochloric acid concentration of 15%, acid leaching temperature of 50°C, acid leaching time of 50 minutes, liquid-solid phase mass ratio of 12:1, and stirring speed of 10 rpm . The acid leaching residue is obtained by...

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Abstract

The invention discloses a method for preparing a titanium-rich material by directly reducing the molten slag from the vanadium-titanium-ferrum concentrate, belonging to the technical field of the comprehensive utilization of the vanadium-titanium-magent ore. The method comprises the following steps: (a) grinding the molten slag directly reduced from the vanadium-titanium-ferrum concentrate, and modifying by oxidizing to prepare the modified slag; (b) adding hydrochloric acid solution into the modified slag prepared in the step (a) for acid leaching, and filtering to obtain the acid-leached slag and the acid-leached liquid; (c) adding sodium hydroxide solution into the acid-leached slag obtain in the step (b) for alkali leaching, and filtering to obtain the alkali-leached slag and the alkali-leached liquid; and (d) washing and calcinating the alkali-leached slag obtained in the step (c) to obtain the titanium-rich material. The invention discloses the novel application of the vanadium-titanium-ferrum concentrate to the direct reduction of the molten slag, and the application effect of the vanadium-titanium-ferrum concentrate is improved greatly. The titanium-rich material prepared by adopting the method has high quality, contains more than 90% of TiO2 and less calcium and magnesium and is suitable for producing chloride process titanium dioxide and titanium sponge.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of vanadium-titanium-magnetite resources, and in particular relates to a method for preparing titanium-rich material by directly reducing molten slag with vanadium-titanium-iron concentrate. Background technique [0002] Vanadium-titanium magnetite is a mineral mainly containing iron, titanium and vanadium, accompanied by a small amount of chromium, nickel, platinum and other comprehensively utilizable components. Its mineral composition is mainly titanomagnetite and ilmenite . It has been found out that the reserves of vanadium-titanium magnetite in the world are more than 40 billion tons. China's Panzhihua-Xichang region is rich in vanadium-titanium magnetite resources, of which iron, vanadium and titanium account for 20%, 63% and 93% of the country's total reserves respectively. At present, vanadium-titanium magnetite is processed by blast furnace smelting, converter vanadiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C22B7/04C22B3/04C22B34/12
CPCY02P10/20
Inventor 刘松利张雪峰方民宪付超李刚陈文明
Owner 盐城捷晶科技有限公司
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