Separation and recovery of V, Ti, Fe and Ca from acidic wastewater and vanadium-bearing steel slag based on a collaborative utilization process

Ju, Jinrong; Feng, Yali; Li, Haoran; Liu, Shunliang

doi:10.1016/j.seppur.2021.119335

Cited by 25 publications

(13 citation statements)

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“…Studies have revealed that when calciumcontaining minerals are leached with sulfuric acid, the amount of bound water in the formed calcium sulfate is mainly affected by the concentration of sulfuric acid and the leaching temperature. 9,48 The conversion between calcium sulfate dihydrate and anhydrous calcium sulfate is based on the equilibrium of the dissolutionprecipitation mechanism. 49 Besides calcium, there is a large amount of silicon in the leaching residue.…”

Section: Characterization Of the Leaching Residuementioning

confidence: 99%

“…[6][7][8] Acidic wastewater is generated in the production of titanium dioxide (TiO 2 ) by the sulfuric acid method. 9 For every ton of titanium dioxide produced, 8-10 tons of acidic wastewater is inevitably produced, of which 25-35% is returned to the titanium dioxide production process for reuse, and 6-6.5 tons of acidic wastewater produced for 1 ton of titanium dioxide is discharged. 4 Acidic wastewater mainly contains 20-25% sulfuric acid (mass fraction) and 30 g/L ferrous ion, in addition to 2-5 g/L titanium and small amounts of magnesium, aluminum, and manganese.…”

Section: Introductionmentioning

confidence: 99%

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Extraction of valuable metals from acidic wastewater and blast furnace slag by a collaborative utilization process

Feng

2022

Asia-Pacific J Chem Eng

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Two typical wastes, acidic wastewater and titanium‐bearing blast furnace slag, are generated in the smelting process of vanadium‐titanium magnetite. Generally, the acidic wastewater is neutralized by lime or limestone and titanium‐bearing blast furnace slag is directly stacked in the tailings pond, which not only pollutes the ecological environment but also causes the waste of metal resources. In this study, a collaborative utilization process for efficient extraction of titanium, iron, magnesium, and aluminum from acidic wastewater and low titanium‐bearing blast furnace (LTBBF) slag was proposed. At the leaching temperature of 80°C, the leaching time of 50 min, and the liquid–solid ratio of 9:1, 99.26% Ti, 99.47% Mg, and 99.45% Al could be extracted from LTBBF slag by acidic wastewater. Leaching residue mainly composed of Ca and Si could be used as silicon fertilizer. The Ti in the leaching solution could be separated by adding Na3PO4. The precipitation efficiency of Ti reached 98.53% under the molar ratio of Na3PO4 to TiO2 of 1.4, reaction temperature of 85°C, and reaction time of 40 min. The titanium phosphate ((TiO)2P2O7) was obtained by calcination of the precipitate at 900°C for 3 h. Adding oxalic acid to the filtrate above, the precipitation efficiency of Fe, Mg, and Mn reached 96.47%, 99.21%, and 99.45%, respectively, under the optimal conditions, while the precipitation efficiency of Al was only .38%. By adjusting the pH of the filtrate to 6.5, 99.83% Al could be precipitated as Al(OH)3, and the final solution was evaporated to obtain Na2SO4 products. The method proposed realizes the harmless treatment of acidic wastewater and LTBBF slag and recovers the metal resources in both of them.

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Section: Characterization Of the Leaching Residuementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extraction of valuable metals from acidic wastewater and blast furnace slag by a collaborative utilization process

Feng

2022

Asia-Pacific J Chem Eng

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“…In China, more than 90% of titanium dioxide is yielded by the sulfuric acid leaching method, and the production of 1 ton of titanium dioxide engenders about 8 tons of titanium white waste acid with a H 2 SO 4 concentration of about 20 wt%, 20–70 g/L of FeSO 4 5,6 . At present, titanium white waste acid is usually disposed by neutralization with lime or limestone, 7 which not only produces red gypsum, an industrial by‐product what the mainly component is calcium sulfate dihydrate and hydroxides such as iron, titanium, and magnesium, but also wastes metals resources 8,9 . It is worth noting that in addition to a large amount of iron, titanium white waste acid is also rich in 2–5 g/L titanium 10 .…”

Section: Introductionmentioning

confidence: 99%

“…5,6 At present, titanium white waste acid is usually disposed by neutralization with lime or limestone, 7 which not only produces red gypsum, an industrial by-product what the mainly component is calcium sulfate dihydrate and hydroxides such as iron, titanium, and magnesium, but also wastes metals resources. 8,9 It is worth noting that in addition to a large amount of iron, titanium white waste acid is also rich in 2-5 g/L titanium. 10 Therefore, in the limited resources, titanium in titanium white waste acid should be considered as a secondary resource for titanium recovery.…”

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confidence: 99%

Recovery of Ti from titanium white waste acid with N1923 extraction and leaching of low‐grade pyrolusite using raffinate

Feng

2022

Asia-Pacific J Chem Eng

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Titanium dioxide industry produces a large amount of titanium white waste acid every year. In this work, to make full use of and recover valuable components in titanium white waste acid, a processing for recovery of Ti from titanium white waste acid with N1923 extraction and leaching of low-grade pyrolusite using raffinate was proposed. After a two-stage countercurrent extraction, 99.93% Ti was extracted, while 6.51% Fe, .11% Mg, .06% Mn, and .08% Al were co-extracted under N1923 concentration of 25% and phase ratio (O/A) of 2/1. The scrubbing efficiency of iron reached 98.53%, while the loss efficiency of titanium was only .94% with 1.5 mol/L sulfuric acid solution under the phase ratio of 1/1. Then, the Ti-loaded organic phase could be effectively stripped by .8 mol/L ammonia water; the single-stage stripping efficiency of titanium was 99.23%. Subsequently, the raffinate could be used for the extraction of manganese from low-grade pyrolusite. The leaching efficiency of manganese was 99.39% at the S/L ratio of 48.00 g/L, leaching temperature of 50 C, and leaching time of 40 min. In addition, thermodynamic calculations revealed that the titanium extraction process by N1923 from titanium white waste acid was an exothermic reaction. The proposed approach is suitable for co-recovery of titanium from titanium white waste acid and manganese from low-grade pyrolusite.

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“…It can also be used to decrease demand for liming in acidic soil [17,18], production of ecological potassium silicate fertilizer [19], can be used in road construction because of its high hardness and good cementitious properties [20,21]. Steel slag can also replace clinker in cement plants and as part of the aggregate [22], it can be used to treat industrial wastewater to remove phosphorus, aqueous ammonium, nitrogen, phenol and arsenic [23,24]. However, its application as a precursor in the synthesis of geopolymers followed by acting as a reinforcement phase in polymeric matrix composites is something rarely found in the literature in general.…”

Section: Introductionmentioning

confidence: 99%

Chemical, thermal, and microstructural characterization of polyethylene terephthalate composites reinforced with steel slag geopolymer waste

Santos

Ramos

Silveira

et al. 2021

jcc

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The search for sustainable materials has grown globally due to the struggle against environmental impacts. From the recycling of PET packaging and the use of steel mill slag residue, from the steel production, it was developed in this work composites of PET matrix with additions of geopolymer obtained from steel mill slag. The composites were produced with concentrations of 0, 20, 40, and 60% of geopolymer and were characterized by XRD, FTIR, TGA, DSC, and SEM. The XRD analyses indicated the presence of mineral constituents referring to the geopolymer in the composites. Through the thermal analyses, it was observed that the addition of geopolymer promoted the increase in thermal stability, besides increasing the crystallinity in concentrations of 40 and 60% of geopolymer. From the micrographs, it was observed that the addition of reinforcement changed the morphology of the material, promoting an increase in the porosity of the material. From the characterizations, it is possible to state that the addition of geopolymers in the PET matrix produces low-cost composites with good properties and can be used in engineering applications.

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Separation and recovery of V, Ti, Fe and Ca from acidic wastewater and vanadium-bearing steel slag based on a collaborative utilization process

Cited by 25 publications

References 43 publications

Extraction of valuable metals from acidic wastewater and blast furnace slag by a collaborative utilization process

Extraction of valuable metals from acidic wastewater and blast furnace slag by a collaborative utilization process

Recovery of Ti from titanium white waste acid with N1923 extraction and leaching of low‐grade pyrolusite using raffinate

Chemical, thermal, and microstructural characterization of polyethylene terephthalate composites reinforced with steel slag geopolymer waste

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