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acid treatment

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Journal Article
Published: 01 April 2006
Clays and Clay Minerals (2006) 54 (2): 220-229.
... from those derived from water-vapor data. With an increase of the acid-treatment concentration, the pore volumes measured using both adsorption techniques increased markedly for all minerals. The pore radii measured from nitrogen isotherms appeared to decrease for all minerals except zeolite, while...
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Journal Article
Published: 01 June 2017
Clays and Clay Minerals (2017) 65 (3): 155-167.
... that an increased temperature during sulfuric acid treatment caused more intense dissolution of the [AlO 6 ] n octahedral sheets ( Cheng et al., 2011 ). The highest content of Fe (11.31%) was observed in the DHal sample and acid activation caused a systematic decrease in the content of Fe in the AHal samples...
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Journal Article
Published: 01 December 2006
Clays and Clay Minerals (2006) 54 (6): 697-702.
...Zorica Vuković; Aleksandra Milutonović; Ljiljana Rožić; Aleksandra Rosić; Zoran Nedić; Dušan Jovanović Abstract Bentonite from the ‘Bogovina’ coal mine in Serbia, was characterized. The influence of acid treatment on its composition, as well as mathematical descriptions of this influence...
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Journal Article
Published: 01 August 2006
Clays and Clay Minerals (2006) 54 (4): 491-499.
... decrease in crystallinity and the formation of X-ray amorphous silica Si–O vibration bands at 1100, 800 and 494 cm −1 accompanied octahedral cation depletion. Acid activation using 2 M and 4 M HCl for 6 h destroyed 30% and 61% of the octahedral sheet, respectively. In contrast, similar treatment using 2.9...
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Journal Article
Journal: Clay Minerals
Published: 01 September 2003
Clay Minerals (2003) 38 (3): 353-360.
...A. YEBRA-RODRÍGUEZ; J. D. MARTÍN-RAMOS; F. del REY; C. VISERAS; A. LÓPEZ-GALINDO Abstract An ab initio determination of the structure of sepiolite after acid treatment (HCl 0.5 n for 24 h) was carried out using X-ray powder diffraction data. After acid treatment, the sections normal...
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Journal Article
Journal: Clay Minerals
Published: 01 December 2001
Clay Minerals (2001) 36 (4): 483-488.
...M. SUÁREZ BARRIOS; C. de SANTIAGO BUEY; E. GARCÍA ROMERO; J. M. MARTÍN POZAS Abstract The physicochemical properties of clays can be modified by acid treatment with inorganic acids. This treatment is usually referred to as ‘acid activation’, because it increases the specific surface area...
FIGURES
Journal Article
Published: 01 June 1998
Clays and Clay Minerals (1998) 46 (3): 225-231.
...M. Myriam; M. Suarez; J. M. Martin Pozas Abstract Sepiolite from Mara (Zaragoza, Spain) and palygorskite from Attapulgus (Georgia, USA) were activated by treatment at different concentrations with solutions of boiling HCI under reflux conditions. The natural and treated solids were characterized...
Journal Article
Journal: Clay Minerals
Published: 01 June 1995
Clay Minerals (1995) 30 (2): 149-155.
Journal Article
Published: 01 September 1970
Journal of Sedimentary Research (1970) 40 (3): 1046-1048.
...Dirk Frankenberg; Robert T. Giles Abstract Tests for suitability of various concentrations of various acids GeoRef, Copyright 2008, American Geological Institute. 1970 ...
Journal Article
Published: 01 January 1957
Micropaleontology (1957) 3 (1): 61-64.
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TABLE 1. Typical results of acetic <b>acid</b> <b>treatment</b> by lithologic type from t...
in > PALAIOS
Published: 01 April 2011
TABLE 1. Typical results of acetic acid treatment by lithologic type from the same nodular limestone body.
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IR spectra of pyrophyllites in the OH-stretching zone after <b>acid</b> <b>treatment</b> ...
Published: 01 March 2007
F ig . 3. IR spectra of pyrophyllites in the OH-stretching zone after acid treatment if necessary: (a) Rob 48-T, (b) Rob 49-T, (c) Guad-T, (d) SN-T, (e) Sued-T, (f) Bin, (g) Nep, (h) Van. For the three last samples, it was not necessary to perform acid treatment because phyllosilicate phases
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IR spectra of pyrophyllites in the OH-bending zone after <b>acid</b> <b>treatment</b> if ...
Published: 01 March 2007
F ig . 4. IR spectra of pyrophyllites in the OH-bending zone after acid treatment if necessary: (a) Rob 48-T, (b) Rob 49-T, (c) Guad-T, (d) SN-T, (e) Sued-T, (f) Bin (g) Nep, (h) Van. For the three last samples, it was not necessary to perform acid treatment because phyllosilicate phases were
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XRD patterns of glauconitic material before and after <b>acid</b> <b>treatment</b>.
Published: 01 August 2006
Figure 5. XRD patterns of glauconitic material before and after acid treatment.
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IR spectra of glauconitic material before and after <b>acid</b> <b>treatment</b>.
Published: 01 August 2006
Figure 6. IR spectra of glauconitic material before and after acid treatment.
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SEM micrographs of sands with and without <b>acid</b> <b>treatment</b> at 20-minute inter...
in > Geophysics
Published: 10 March 2006
Figure 8. SEM micrographs of sands with and without acid treatment at 20-minute intervals: (a) control sample (no acid treatment), (b) 20-minute acid-treated sample, (c) 40-minute acid-treated sample, (d) 60-minute acid-treated sample, and (e) 80-minute acid-treated sample. Samples treated
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XRD patterns of sepiolite before and after <b>acid</b> <b>treatment</b>, the latter showi...
Published: 01 September 2003
F ig . 1. XRD patterns of sepiolite before and after acid treatment, the latter showing a relative increase in the background.
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Test results of the garnet <b>acid</b> <b>treatment</b> preparation technique. Test sampl...
Published: 01 January 2002
Fig. 4 Test results of the garnet acid treatment preparation technique. Test sample numbers are from Baxter (2000) collected at Townshend Dam, Vermont and have an expected age of about c.380 Ma (see Kohn & Valley 1994 ). ( a ) Isochron plot of data from five samples from the same garnet
Journal Article
Published: 01 February 2014
Mineralogical Magazine (2014) 78 (1): 73-89.
...Jing Liu; Xi Huang; Juan Liu; Weiqing Wang; Wei Zhang; Faqing Dong Abstract Acid mine drainage (AMD) commonly contains elevated concentrations of As(III) and/or As(V) due to oxidation of arsenic-containing sulfides. Bone char has been used as a low-cost filling material for passive treatment...
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( a ) XRD patterns of glauconite after <b>acidic</b> <b>treatment</b> (pH = 7.5–15) showi...
Published: 01 February 2008
F ig . 3. ( a ) XRD patterns of glauconite after acidic treatment (pH = 7.5–15) showing selective peak broadening in the region of (020)/(110) reflections. ( b ) HRTEM image of a dissolving glauconite grain.