Method for recycling aluminum from blast furnace slag through multistage acid leaching

A technology for acid leaching and blast furnace slag, applied in the field of inorganic chemical industry

Inactive Publication Date: 2015-11-25
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

[0060] 1), smash

[0061] The titanium-containing blast furnace slag (water quenched slag TiO2: 23.94%, CaO: 25.08%, SiO2: 24.06%, MgO: 8.05%, Al2O3: 17.95%, other about 1%) is magnetically separated and dry crushed to 325 mesh.

[0062] 2), Concentrated acid leaching, oxidation and leaching slag washing

[0063] 2.1), one-stage acid leaching and leaching residue washing

[0064] 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; :...

Embodiment 2

[0111] Embodiment 2: repeat embodiment 1, just adopt four-stage acid leaching process.

[0112] 2. Four-stage acid leaching

[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 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 at 100°C, weighed 3.4g, yield 106.2%.

[0115] 2.2. Seco...

Embodiment 3

[0122] Embodiment 3 (solid / liquid ratio is 1:25)

[0123] Example 1 was repeated, except that the five-stage acid leaching process was adopted.

[0124] 2. Five-stage acid leaching

[0125] 2.1 One-stage acid leaching and leaching residue washing

[0126] 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 12g of blast furnace slag powder, control the temperature 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: 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 at 100°C, weighed 3.1g, yield 106.2%.

[0127] 2....

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PUM

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Abstract

A method for recycling aluminum from blast furnace slag through multistage acid leaching includes the steps that a leaching reaction is made between blast furnace slag powder obtained after smashing and magnetic separation and concentrated hydrochloric acid, and white carbon black is filtered out and recycled; calcium is precipitated and separated through magnesium sulfate after iron, vanadium and titanium are extracted from filtrate and the hydrochloric acid is recycled, and a high-purity gypsum product is obtained; chromium, residual iron and residual vanadium are oxidized through chlorine, and chromium, vanadium and iron residues are obtained through filtering; chromium and vanadium are extracted from filtrate; aluminum is precipitated through magnesium oxide, and an aluminum hydroxide product is obtained through filtering; manganese is oxidized into manganese dioxide sediment through chlorine to be filtered and recycled; filtrate is evaporated and concentrated, and magnesium chloride hexahydrate is obtained through crystallization; magnesium chloride crystals are decomposed into a magnesium oxide product; iron and vanadium strip liquor is decomposed to obtain a mixture of iron oxide and vanadium pentoxide; and titanium dioxide is recycled from titanium strip liquor. The method is free of process waste residues and sewage drainage, less in auxiliary raw material consumption and fewer in auxiliary raw material variety, and only 250 Yuan is spent in processing one ton of waste residues; and the separation effect on various elements including silicon, titanium, calcium, magnesium, aluminum, manganese, iron and chromium is good, the product quality is good, and economic benefits are obvious.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and specifically relates to a multi-stage acid leaching method for recovering aluminum from blast furnace slag. Background technique [0002] The chemical composition of blast furnace slag is complex, mainly containing 22-25% of titanium dioxide, 22-26% of silicon dioxide, 16-19% of aluminum oxide, 0.22-0.44% of ferric oxide, 22-29% of calcium oxide and 7% of magnesium oxide. ~9%. There are two main reasons why titanium resources in high-titanium blast furnace slag cannot be effectively and comprehensively utilized: one is that the titanium in the slag is dispersed in perovskite, titanium-rich diopside, climbing titanium diopside, spinel and carbon nitrogen In various titanium-containing mineral phases such as titanium oxide, the intercalation relationship is complex, and 50% of the titanium is concentrated in the perovskite; the second is that the phase grains of the titaniu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B21/00C21B3/04
CPCY02P10/20Y02W30/50
Inventor 李翔
Owner 衡阳市金铭环境科技有限公司
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