Method for recycling titanium, silicon, aluminum, calcium and magnesium from titaniferous blast furnace slag by multistage acid leaching

A technology for acid leaching and blast furnace slag, which is applied in the fields of magnesium, silicon, ironmaking or steelmaking process, manganese and iron, calcium, vanadium, chromium, aluminum, and titanium recovery

Inactive Publication Date: 2014-07-30
衡阳市金铭环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Without exception, chemical leaching methods will produce a large amount of new acid-containing liquid waste and solid waste; the same is true for blast furnace slag modification or beneficiation; there is still no breakthrough in the engineering equipment and waste slag post-treatment problems of the chlorination method; pyrometallurgy The method avoids the above-mentioned new environmental hazards, but the utilization of the alloy needs to be further studied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] 1), smash

[0111] Titanium-containing blast furnace slag (water-quenched slag TiO 2 : 23.94%, CaO: 25.08%, SiO 2 : 24.06%, MgO: 8.05%, Al2O3: 17.95%, other about 1%) magnetic separation, dry crushing to 325 mesh.

[0112] 2), Concentrated acid leaching, oxidation and leaching slag washing

[0113] 2.1), one-stage acid leaching and leaching residue washing

[0114] In a 500ml three-necked flask, add 300ml of concentrated hydrochloric acid (Cl: 406g / l, H: 11.50g / l) with a concentration greater than 34%, start stirring, add 20g of blast furnace slag powder, heat up to 68-72°C, and strictly control Below 73°C, wait for the material liquid to become transparent and change from thick to thin, keep the temperature and stir for 0.5 hours, then the reaction is qualified. Suction filtration, get filtrate 260ml (Cl: 406g / l, H: 9.28g / l, Mg: 3.25g / l, Ca: 11.95g / l, Al: 6.35g / l, Ti: 7.68g / l, Fe: 0.43g / l, V: 0.18g / l, Cr: 0.15g / l, Mn: 0.37g / l) for two-stage acid leaching; :2 hydr...

Embodiment 2

[0162] 1), smash

[0163] Titanium-containing blast furnace slag (water-quenched slag TiO 2 : 14.04%, CaO: 28.07%, SiO 2 : 24.26%, MgO: 11.97%, Al 2 o 3 : 21.03%, other about 1%) magnetic separation, dry crushing to 325 mesh.

[0164] 2), Concentrated acid leaching, oxidation and leaching slag washing

[0165] 2.1), one-stage acid leaching and leaching residue washing

[0166] In a 500ml three-necked flask, add 300ml of concentrated hydrochloric acid (Cl: 410.45g / l, H: 11.52g / l) with a concentration greater than 34%, start stirring, add 20g of blast furnace slag powder, heat up to 68-72°C, strictly control Below 73°C, when the material liquid becomes transparent and changes from thick to thin, keep the temperature and stir for 0.5 hours to pass the reaction. Suction filtration, get filtrate 260ml (Cl: 410.45g / l, H: 9.28g / l, Mg: 4.85g / l, Ca: 13.45g / l, Al: 7.25g / l, Ti: 4.06g / l, Fe : 0.38g / l, V: 0.10g / l, Cr: 0.15g / l, Mn: 0.41g / l) for two-stage acid leaching; Wash with 1:2...

Embodiment 3

[0211] Embodiment 3: (solid / liquid ratio is 1:20)

[0212] Example 1 was repeated, except that the four-stage acid leaching process was adopted.

[0213] 2. Four-stage acid leaching

[0214] 2.1 One-stage acid leaching and leaching residue washing

[0215] In a 500ml three-neck flask, add 300ml of concentrated hydrochloric acid (Cl: 406g / l, H: 11.50g / l) with a concentration greater than 34%, start stirring, add 15g of titanium-containing blast furnace slag powder, and control the temperature to 68-72°C. Strictly control the temperature below 73°C. After the material liquid becomes transparent and changes from thick to thin, keep the temperature and stir for 0.5 hours, then the reaction is qualified. Suction filtration, get filtrate 260ml (Cl: 406g / l, H: 9.28g / l, Mg: 3.25g / l, Ca: 11.95g / l, Al: 6.35g / l, Ti: 7.68g / l, Fe: 0.43g / l, V: 0.18g / l, Cr: 0.15g / l, Mn: 0.37g / l) for two-stage acid leaching; :2 hydrochloric acid, 1:5, 1:10 dilute hydrochloric acid, tap water washed, dried...

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PUM

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Abstract

The invention discloses a method for recycling titanium, silicon, aluminum, calcium and magnesium from titaniferous blast furnace slag by multistage acid leaching. The titaniferous blast furnace slag is especially titaniferous blast furnace slag obtained by carrying out iron making on vanadium titanomagnetite in Panzhihua regions. The method comprises the following steps: carrying out acid leaching (especially multistage acid leaching) on furnace slag to obtain an acid leaching solution and white carbon black; and carrying out an extraction technique on the acid leaching solution to obtain titanium, aluminum, calcium, magnesium, manganese, iron, chromium, vanadium and other useful metals. On the premise of recycling resources, the method implements cyclic utilization of waste (using waste of one technique as a raw material of another technique), eliminates waste discharge, obviously lowers the cost and enhances the recycling efficiency.

Description

technical field [0001] The present invention relates to a process for the recovery of metals such as titanium, vanadium and chromium from titanium-containing blast furnace slag from iron or steel making processes using a multi-stage acid leaching and extraction process for the recovery of metals such as titanium, vanadium and chromium from the slag. More specifically, the present invention relates to a method for recovering titanium, silicon, aluminum, calcium, magnesium, manganese, iron, chromium and vanadium from titanium-containing blast furnace slag. Background technique [0002] The Panzhihua area has 9.66 billion tons of vanadium-titanium magnetite, which contains more than 10 important strategic resources such as titanium, iron, vanadium, chromium, cobalt, nickel, gallium, and scandium. The proven reserves of TiO2 are 870 million tons. Panzhihua Iron and Steel Co., Ltd. has been committed to the recycling of its valuable elements for a long time. It mines 11.5 million...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C21B3/04
CPCY02P10/20Y02W30/50
Inventor 李翔
Owner 衡阳市金铭环境科技有限公司
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