Preparation of α-CaSO4·½H2O with tunable morphology from flue gas desulphurization gypsum using malic acid as modifier: A theoretical and experimental study

Guan, Qingjun; Hu, Yuehua; Tang, Honghu; Sun, Wei; Gao, Zhiyong

doi:10.1016/j.jcis.2018.06.068

Cited by 71 publications

(29 citation statements)

References 57 publications

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“…The highest binding energy component at 532.63 was clearly attributed to water adsorption [45]. The middle band at 531.74 eV was attributed to the oxygen belonging to the adventitious carbon contamination, carbonate or phosphate [46][47][48][49]. The main O 1s peak at 531.04 eV represented CO3 [46].…”

Section: X-ray Photoelectron Spectroscopy (Xps) Analysismentioning

confidence: 99%

Selective Flotation of Cassiterite from Calcite with Salicylhydroxamic Acid Collector and Carboxymethyl Cellulose Depressant

Tian

Gao

et al. 2018

Minerals

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Abstract:Cassiterite is the most common and important tin-bearing mineral, and calcite, a primary gangue mineral is generally found in tin deposit. The flotation separation of cassiterite from calcite remains a challenge due to their similar response to traditional reagents. In cassiterite flotation, sodium oleate (NaOL) and sodium silicate (SS) have been widely used as a collector and a depressant, respectively. However, the low selectivity of NaOL and the large amount of SS required (which leads to serious problems in wastewater treatment) remain a difficult issue. In this study, a novel reagent scheme using lead nitrate as the activator, salicylhydroxamic acid (SHA) as the collector and carboxymethyl cellulose as the depressant was employed to improve the separation selectivity of cassiterite from calcite. Results of the flotation experiment using this new reagent scheme showed that compared with the previously reported scheme using benzohydroxamic acid (BHA) as the collector, the separation of cassiterite from calcite exhibited a higher selectivity and selectivity index (SI). The mechanism of the selective separation was investigated by zeta potential measurements, Fourier transform infrared and X-ray photoelectron spectroscopy analysis.

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Section: X-ray Photoelectron Spectroscopy (Xps) Analysismentioning

confidence: 99%

Selective Flotation of Cassiterite from Calcite with Salicylhydroxamic Acid Collector and Carboxymethyl Cellulose Depressant

Tian

Gao

et al. 2018

Minerals

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“…3 In recent years, high-value utilization of I-PG has drawn signicant attention and so far, the most effective way to achieve high-value utilization of I-PG is to produce a-calcium sulphate hemihydrate (a-CaSO 4 $0.5H 2 O). [4][5][6] To date, methods for preparing a-CaSO 4 $0.5H 2 O crystals from CaSO 4 $2H 2 O mainly include autoclave hydrothermal, [7][8][9][10] atmospheric salt solution, [11][12][13][14] reverse microemulsion 15 and alcohol-water solution. [16][17][18] The autoclave hydrothermal method involves high temperature (usually above 120 C) and certain pressure, 19,20 which are not conducive to industrialization.…”

Section: Introductionmentioning

confidence: 99%

Aspect ratio-controlled preparation of α-CaSO₄·0.5H₂O from phosphogypsum in potassium tartrate aqueous solution

2019

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“…obtained α‐CaSO 4 ·0.5H 2 O whiskers with tunable aspect ratio by using succinic acid as the morphology modifier. The effective use of other organic additives such as sodium dicarboxylates, cetyltrimethyl ammonium bromide (CTAB), malic acid, and ethylene glycol has also been reported . The morphology modification effects of these organic species were generally attributed to their selective adsorption onto different facet of the α‐CaSO 4 ·0.5H 2 O crystals.…”

Section: Introductionmentioning

confidence: 99%

“…The effective use of other organic additives such as sodium dicarboxylates, cetyltrimethyl ammonium bromide (CTAB), malic acid, and ethylene glycol has also been reported. [17,[22][23][24][25][26][27] The morphology modification effects of these organic species were generally attributed to their selective adsorption onto different facet of the α-CaSO 4 ·0.5H 2 O crystals. However, up to now, the influence of polymer molecules on the hydrothermal formation of CaSO 4 ·0.5H 2 O whiskers has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cationic Polyacrylamide on Hydrothermal Formation of Ultralong α‐CaSO₄·0.5H₂O Whiskers

Wang

Fan

Hou

et al. 2019

Crystal Research and Technology

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Herein, ultralong α‐CaSO4·0.5H2O whiskers with an average length above 500 µm and aspect ratios of 200–500 are hydrothermally produced employing trace amount (0.06 mg L−1) of cationic polyacrylamide (CPAM) as the morphology modifier. The hydrothermal formation mechanisms of α‐CaSO4·0.5H2O involving the initial nucleation of bassanite nanocrystals/nanorods and their subsequent self‐assembly into long whiskers through oriented attachment are revealed for the first time. Experimental results indicate that CPAM is electrostatically adsorbed onto the initial bassanite nanorods and results in their near‐neutral surfaces, favoring the assembly of the initial nanorods into larger aggregates, thus finally leading to the formation of ultralong α‐CaSO4·0.5H2O whiskers with high aspect ratios. Moreover, α‐CaSO4·0.5H2O whiskers are calcined to CaSO4 whiskers for the fabrication of polyvinyl chloride (PVC)/CaSO4 composites with a high impact strength and flexural strength of 42.0 KJ m−2 and 53.6 MPa, respectively, indicating that the mechanical properties of the PVC/CaSO4 composites could be significantly improved by these ultralong CaSO4 whiskers.

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Preparation of α-CaSO4·½H2O with tunable morphology from flue gas desulphurization gypsum using malic acid as modifier: A theoretical and experimental study

Cited by 71 publications

References 57 publications

Selective Flotation of Cassiterite from Calcite with Salicylhydroxamic Acid Collector and Carboxymethyl Cellulose Depressant

Selective Flotation of Cassiterite from Calcite with Salicylhydroxamic Acid Collector and Carboxymethyl Cellulose Depressant

Aspect ratio-controlled preparation of α-CaSO₄·0.5H₂O from phosphogypsum in potassium tartrate aqueous solution

Effects of Cationic Polyacrylamide on Hydrothermal Formation of Ultralong α‐CaSO₄·0.5H₂O Whiskers

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Preparation of α-CaSO4·½H2O with tunable morphology from flue gas desulphurization gypsum using malic acid as modifier: A theoretical and experimental study

Cited by 71 publications

References 57 publications

Selective Flotation of Cassiterite from Calcite with Salicylhydroxamic Acid Collector and Carboxymethyl Cellulose Depressant

Selective Flotation of Cassiterite from Calcite with Salicylhydroxamic Acid Collector and Carboxymethyl Cellulose Depressant

Aspect ratio-controlled preparation of α-CaSO4·0.5H2O from phosphogypsum in potassium tartrate aqueous solution

Effects of Cationic Polyacrylamide on Hydrothermal Formation of Ultralong α‐CaSO4·0.5H2O Whiskers

Contact Info

Product

Resources

About

Aspect ratio-controlled preparation of α-CaSO₄·0.5H₂O from phosphogypsum in potassium tartrate aqueous solution

Effects of Cationic Polyacrylamide on Hydrothermal Formation of Ultralong α‐CaSO₄·0.5H₂O Whiskers