Dissolution mechanism of colemanite in sulphuric acid solutions

Gür, Aycan

doi:10.1007/s11814-007-0007-9

Cited by 22 publications

(11 citation statements)

References 7 publications

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“…The hBNs_colemanite also include boron nitride nanotubes (BNNTs) in the product mixture (Figure 1B ). This can be explained with the presence of metal oxides such as CaO, B 2 O 3 , Fe 2 O 3 , Al 2 O 3 , MgO, and Na 2 O in colemanite acting as catalysts (Gür, 2007 ). Transition metals and their oxides play an important role in synthesis of BNNTs as catalysts to roll the hBN layers into tube shape (Pakdel et al, 2012 ).…”

Section: Resultsmentioning

confidence: 99%

One-Step Synthesis of Hexagonal Boron Nitrides, Their Crystallinity and Biodegradation

Şen

Emanet

Çulha

2018

Front. Bioeng. Biotechnol.

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Hexagonal boron nitrides (hBNs) have recently been investigated for several novel applications due to their unique properties such as biocompatibility, superhydrophobicity, electrical insulation, and thermal and chemical stability. In addition, their biodegradation products have recently reported to have therapeutic effect on certain cancer types. hBNs are easily synthesized from boron and nitrogen precursors at moderately low temperatures. However, crystallinity and yield vary depending on the type of precursor, reaction temperature, and duration. In this study, a simple one-step hBNs synthesis method is reported without a catalyst, which might be an undesired contaminant for biomedical applications. The influence of boron precursors (boric acid, colemanite, or boron trioxide) on hBNs crystallinity, stability, and biodegradation in suspensions containing oxidative and hydrolytic degradation agents is investigated with the aim of their possible application in biomedicine. We found that the choice of boron precursor is a critically important parameter controlling the hBNs crystallinity and dependently influencing the biodegradation rate.

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Section: Resultsmentioning

confidence: 99%

One-Step Synthesis of Hexagonal Boron Nitrides, Their Crystallinity and Biodegradation

Şen

Emanet

Çulha

2018

Front. Bioeng. Biotechnol.

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“…Some researchers studied about the dissolution of boron minerals in hydrochloric acid, sulfuric acid, oxalic acid, citric acid, chlorine saturated water, and sulfur dioxide saturated water and using carbon dioxide gas in aqueous media (Ata et al 2000;Temur et al 2000;Küçük et al 2002;Çavuş and Kuşlu, 2005;Gür, 2007;Tunç et al 2007). …”

Section: [Equation 1]mentioning

confidence: 99%

Use of Aspergillus niger in the bioleaching of colemanite for the production of boric acid

Bayat¹,

Arslan²,

Bayat³

2011

Electro Journal of Biotech

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Colemanite is one of the most important underground riches of Turkey, having approximately 60% of the world boron deposits, and it has a large portion in the deposits. In this study, chemical leaching and biological leaching methods were used for production of boric acid from colemanite (2CaO · 3B 3 O 3 · 5H 2 O) (Emet-Kütahya, Turkey). Oxalic acid concentration, temperature, stirring time and solid-to-liquid ratio were taken as parameters in the chemical leaching process. It was found that the dissolution rate increases with increasing oxalic acid concentration and temperature but it decreases at higher solid-to-liquid ratios in the chemical leaching process. Using optimum conditions (d 100 = 0.075 mm; 5% solids by weight; 0.55 M oxalic acid; 80 ± 2ºC leaching temperature; 150 rpm stirring speed; 90 min leaching time) for colemanite sample (28.05% B 2 O 3 ) on chemical leaching with oxalic acid experiments, the calculated boric acid extraction efficiency from colemanite ore was 97.89%. Optimum conditions on bioleaching of Emet-Kütahya, Turkey colemanite ores using the fungus Aspergillus niger were found to be as follows: reaction temperature 25 ± 2 o C; solid-to-liquid ratio 5% solids by weight; d 100 = 0.075 mm; stirring speed 150 rpm; initial the fungus populations in the inocula about 3 x 10 7 cells/ml and reaction time 21 days. The calculated boric acid extraction efficiency from colemanite ore was 90.18% under the optimum conditions. Bioleachate contained 12.95 g/l B 2 O 3 , 6.60 g/l Ca and 0.087 g/l Mg. Compared with chemical leaching at 5% pulp density, the fungus was less efficient in the extraction of B 2 O 3 from colemanite but the difference in the extraction yields between the two processes was less than 10%. Although bioleaching generally requires a longer period of operation compared to chemical leaching, these results suggest that bioleaching by A. niger may be an alternative or adjunct to conventional physicochemical treatment processes of colemanite to produce boric acid.

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“…Boric acid (H3BO3), which has many production methods, is a boron intermediate used in many industries [18]. Some of these methods are involving the reactions of ulexite mineral with hydrochloric acid (HCl) [19], tincal with sulfuric acid (H2SO4) [20], colemanite with sulfuric acid (H2SO4) [21], tincal with nitric acid (HNO3) [22]. In Turkey, the manufacturing of boric acid has been carried out from the colemanite method [23].…”

Section: Introductionmentioning

confidence: 99%

The Energy and Exergy Analysis of the Reactor Unit of Boric Acid Production Process with ChemCAD Simulation

Kızıltaş¹

2022

BEN

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Energy and exergy analysis of systems are of great importance to enhance the energy and exergy efficiency of industrial production facilities. With the energy and exergy analyses performed, the energy dependency of the production facilities and their energy consumption can be reduced, the price of the product can decrease, and the profit margin can increase. Additionally, it is ensured that the energy produced based on fossil fuels is used in a controlled way. In the present study, the analysis of energy and exergy has been performed for the production reactor unit of the Boric Acid from Colemanite. The first law of thermodynamics and ChemCAD simulation program was used for energy analysis calculations, and the calculations of exergy analysis were carried out by using the second law of thermodynamics. The total energy loss of the reactor unit and the calculated energy loss per 100 kcal input steam were calculated as 110880 kcal/h and 3.724%, and the losses of total exergy in the reactor units and the losses of exergy calculated per 100 kcal input steam were calculated as 225058.86 kcal/h and 30.095%, respectively. Exergy efficiency for the reactor unit has been determined as 3.3 %. Some suggestions were given for the reactor units of boric acid production plants to minimize system losses.

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Dissolution mechanism of colemanite in sulphuric acid solutions

Cited by 22 publications

References 7 publications

One-Step Synthesis of Hexagonal Boron Nitrides, Their Crystallinity and Biodegradation

One-Step Synthesis of Hexagonal Boron Nitrides, Their Crystallinity and Biodegradation

Use of Aspergillus niger in the bioleaching of colemanite for the production of boric acid

The Energy and Exergy Analysis of the Reactor Unit of Boric Acid Production Process with ChemCAD Simulation

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