Spectrophotometric and inductively coupled plasma atomic emission spectrometric determination of titanium in ilmenites after rapid dissolution with phosphoric acid

Jb, de Andrade; Gs, Nunes; Mp, Veiga; Ac, Costa; Sl, Ferreira; Am, Amorim; Reis, Sabrina T.

doi:10.1016/s0039-9140(96)02026-7

Cited by 15 publications

(7 citation statements)

References 14 publications

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“…Then, NiHPO 4 can be transformed into NiH 2 P 2 O 7 when heated [ 18 , 19 ]. In the sample of the catalyst obtained at 380 °C under 9 MPa H 2 , the phase of Ni(PO 3 ) 2 (PDF №28-708) was found as a result of NiH 2 P 2 O 7 decomposition at higher temperature [ 19 ]. Moreover, in the sample obtained at 340 °C under 9 MPa H 2 , terephthalic acid (PDF №31-1916) was identified.…”

Section: Resultsmentioning

confidence: 99%

PET Waste Recycling into BTX Fraction Using In Situ Obtained Nickel Phosphide

et al. 2023

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The annual production of plastic waste is a serious ecological problem as it causes substantial pollution of the environment. Polyethylene terephthalate, a material usually found in disposable plastic bottles, is one of the most popular material used for packaging in the world. In this paper, it is proposed to recycle polyethylene terephthalate waste bottles into benzene-toluene-xylene fraction using a heterogeneous nickel phosphide catalyst formed in situ during the recycling process. The catalyst obtained was characterized using powder X-ray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy techniques. The catalyst was shown to contain a Ni2P phase. Its activity was studied in a temperature range of 250–400 °C and a H2 pressure range of 5–9 MPa. The highest selectivity for benzene-toluene-xylene fraction was 93% at quantitative conversion.

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Section: Resultsmentioning

confidence: 99%

PET Waste Recycling into BTX Fraction Using In Situ Obtained Nickel Phosphide

et al. 2023

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“…16 After the system reached a pre-set temperature, TiCl 4 (reagent grade, Beijing Chemical Industries, Beijing, China) gas was slowly charged into the bath, and samples were removed from the salt with a quartz tube at different mole fractions of TiCl 4 . The concentration of fluoride and titanium ions in the sample were determined via titration 17 and an inductively coupled plasma atomic emission spectrometer (ICP-AES; NexION 300D; PerkinElmer, USA), 18 respectively, and the phase composition was measured via X-ray diffraction (XRD; X'pert PRO; PANalytical, Almelo, Netherlands). The Electrochemical Society of Japan http://dx.doi.org/10.5796/electrochemistry.85.715…”

Section: Preparation Of the Fluoride-chloride Saltmentioning

confidence: 99%

Preparation of Titanium from TiCl<sub>4</sub> in a Molten Fluoride-chloride Salt

Zhu

Qiu

Sun³

2017

Electrochemistry

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Titanium was prepared from TiCl 4 in molten NaCl-KCl-NaF salt. The product of the reaction of TiCl 4 with NaF was identified using X-ray diffraction, and its electrochemical behavior was studied using cyclic voltammetry and square wave voltammetry. The electrochemical deposition of titanium was investigated during the addition of TiCl 4 to NaClKCl-NaF melts. The results indicate that Na 2 TiF 6 was first obtained through the reaction of NaF with TiCl 4 in the NaFKCl-NaCl melt, and Na 2 TiF 6 was decomposed to Na + and [TiF 6 ] 2− in the melts. [TiF 6 ] 2− was then sequentially reduced to [TiF 6 ] 3− and Ti at the cathode, accompanied by chlorine gas emission at the anode and fluoride formation at the cathode.

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“…Based on energy dispersive x-ray (EDX) analyses, these particles have a chemical composition similar to ilmenite, FeTiO 3 . Ilmenite is largely resistant to dissolution by NaOH (see Amer 2002;de Andrade et al 1997;McKinley et al 1986 for example), and its increase in concentration in the NaOH-treated quartz sand is the result of dissolution of other particles, not the precipitation of additional ilmenite.…”

Section: Mineralogy Of the Sand Column Experimentsmentioning

confidence: 99%

The Influence of Glass Leachate on the Hydraulic, Physical, Mineralogical and Sorptive Properties of Hanford Sediment

Kaplan¹,

Serne²,

Schaef³

et al. 2003

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The immobilized low activity waste (ILAW) generated from the Hanford Site will be disposed of in a vitrified form. It is expected that leachate from the vitrified waste will have a high pH and high ionic strength. The objective of this study was to determine the influence of glass leachate on the hydraulic, physical, mineralogical, and sorptive properties of Hanford sediments. Our approach was to put solutions of NaOH, a simplified surrogate for glass leachate, in contact with quartz sand, a simplified surrogate for the Hanford subsurface sediment, and Warden soil, an actual Hanford sediment. Following contact with three different concentrations of NaOH solutions, changes in hydraulic conductivity, porosity, moisture retention, mineralogy, aqueous chemistry, and soil-radionuclide distribution coefficients were determined.Under chemical conditions approaching the most caustic glass leachate conditions predicted in the near field of the ILAW disposal site, approximated by 0.3 M NaOH, significant changes in mineralogy were observed. The clay minerals of the Hanford sediment evidenced the greatest dissolution thereby increasing the relative proportions of the more resistant minerals, e.g., quartz, feldspar, and calcite, in the remaining mass. Some re-precipitation of solids (mostly amorphous gels) was observed after caustic contact with both solids; these precipitates increased the moisture retention in both sediments, likely because of water retained within the gel coatings. The hydraulic conductivities were slightly lower, but because of experimental artifacts, these reductions should not be considered significant. Thus, there does not seem to be large differences in the hydraulic properties of the quartz sand or Warden silt loam soil after 192 days of contact with caustic fluids similar to glass leachate. The long-term projected impact of the increased moisture retention has not been evaluated but likely will not make past simplified performance projections invalid.

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Spectrophotometric and inductively coupled plasma atomic emission spectrometric determination of titanium in ilmenites after rapid dissolution with phosphoric acid

Cited by 15 publications

References 14 publications

PET Waste Recycling into BTX Fraction Using In Situ Obtained Nickel Phosphide

PET Waste Recycling into BTX Fraction Using In Situ Obtained Nickel Phosphide

Preparation of Titanium from TiCl<sub>4</sub> in a Molten Fluoride-chloride Salt

The Influence of Glass Leachate on the Hydraulic, Physical, Mineralogical and Sorptive Properties of Hanford Sediment

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