Ultra clean coal production by microwave irradiation pretreatment and sequential leaching with HF followed by HNO3

Jorjani, E.; Chapi, H. Ghasemi; Tayebi-Khorami, Maedeh

doi:10.1016/j.fuproc.2011.05.008

Cited by 37 publications

(13 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Producing ultra-clean coal by microwave pre-treatment and sequential leaching with HF and HNO 3 was reported [140]. The demineralization of bituminous coal of UK using a two-stage leaching by hydrofluoric acid and ferric nitrate [137] showed decrease in ash content from 5.3% to 990 ppm.…”

Section: Acid Leachingmentioning

confidence: 97%

Demineralization of low grade coal – A review

Meshram

Purohit

Sinha

et al. 2015

Renewable and Sustainable Energy Reviews

153

View full text Add to dashboard Cite

Section: Acid Leachingmentioning

confidence: 97%

Demineralization of low grade coal – A review

Meshram

Purohit

Sinha

et al. 2015

Renewable and Sustainable Energy Reviews

153

View full text Add to dashboard Cite

“…Jones, Lelyveld, Mavrofidis, Kingman and Miles [5] concluded that microwave heating offers a number of advantages over conventional heating such as: non-contact heating, energy transfer, no heat transfer, rapid heating, material selective heating, volumetric heating, quick start-up and stopping, heating starting from the interior of the material body, higher level of safety and automation, and no waste gas. Thus, a lot of research has been conducted in the fields of pre-treatment [6,7], drying [8,9], roasting [10,11], reduction [12] and the leaching strengthening of the processes by microwave energy [13,14].…”

Section: Introductionmentioning

confidence: 99%

Deposition behavior of TiB2 by microwave heating chemical vapor deposition (CVD)

Sun

Huang

et al. 2015

Green Processing and Synthesis

View full text Add to dashboard Cite

Microwave heating chemical vapor deposition (CVD) is used to deposit titanium diboride (TiB 2 ) films on graphite substrate using a gas mixture of TiCl 4 , BCl 3 , H 2 and Ar. The influences of microwave power and the growth rate of TiB 2 are studied by using X-ray diffraction, field emission scanning electron microscopy (FESEM) and energy dispersive spectrometer (EDS). In the range of experimental conditions, the TiB 2 film's micro-hardness evaluated by using a computer controlled micro-hardness tester increases with increasing deposition temperature and microwave power. The grain size and the growth rate of TiB 2 film are also improved with increasing microwave power at a fixed gas flow ratio of TiCl 4 and BCl 3 , and the bulk TiB 2 is obtained at a higher hardness.

show abstract

“…Jones, Lelyveld, Mavrofidis, Kingman and Miles [6] concluded that microwave heating offers a number of advantages over conventional heating such as: non-contact heating; energy transfer, not heat transfer; rapid heating; material selective heating; volumetric heating; quick start-up and stopping; heating starts from interior of the material body; higher level of safety and automation; no waste gas. Thus, the re searchers have done many researches in fields of pre-treatment [7,8], drying [9,10], roasting [11,12], reduction [13] and leaching strengthening of the processes by microwave energy [14][15][16][17], as demonstrated. As CuCl residue is produced from removing Cl -from zinc sulfate solution by adding Cu + to form CuCl, it is mainly consisted of CuCl and CuSO 4 .…”

Section: Introductionmentioning

confidence: 99%

Dechlorination Mechanism of CuCl Residue from Zinc Hydrometallurgy by Microwave Roasting

Peng

et al. 2014

High Temperature Materials and Processes

View full text Add to dashboard Cite

Removal of chlorine (Cl) from the CuCl residue in the process of zinc hydrometallurgy is of great importance to improve the process economics. The current processing methods result in generation of large quantities of polluted discharge necessitating waste treatment systems. The present work attempts to de-chlorinate the CuCl residue through thermal treatment with application of microwave, towards which the effect of the major experimental factors such as roasting temperature, heating duration and particle size of samples on the process has been investigated. And the changes of Gibbs free energy (ΔG) of the dechlorination reactions are calculated which show that: 1) CuCl can react with H 2 O and air to produce CuO and HCl(g); 2) CuCl can be oxidized by air into CuO and Cl 2 would be released. The tail gas chromatography, XRD and SEM-EDS analysis results of samples before and after microwave roasting verified the thermodynamics study results. Thus, the process of dechlorination by microwave roasting technology is feasible, and the tail gas can be mainly HCl(g) and air which can be absorbed with water and produce hydrochloride easily.

show abstract

Ultra clean coal production by microwave irradiation pretreatment and sequential leaching with HF followed by HNO3

Cited by 37 publications

References 23 publications

Demineralization of low grade coal – A review

Demineralization of low grade coal – A review

Deposition behavior of TiB2 by microwave heating chemical vapor deposition (CVD)

Dechlorination Mechanism of CuCl Residue from Zinc Hydrometallurgy by Microwave Roasting

Contact Info

Product

Resources

About