Saving time on cement analysis

El-Shahat, R. M.; Hassanein, H.; Alfantoukh, M.

doi:10.1080/09613217808550660

Cited by 3 publications

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“…The extent of iron removal increases by increasing the roasting temperature up to 623 K, whereas it decreases significantly at 723 and 823 K as can be seen from values illustrated in (NH,),Fe(SO,), at 623 K, whereas it is converted to NH,Fe(SO,), and insoluble iron oxide at 723 and 823 K. This conversion can be expressed by the following equation : 6(NH,),Fe(SO4), + 4NH,Fe(SO,), ' 1' > 673 K (10) gaseous + Fezo3+products…”

Section: Leaching Of Feo From Kaolin Ore By (Nh)somentioning

confidence: 93%

Characterization of products of interaction between kaolin ore and ammonium sulphate

Fouda

Amin

Abd-Elzaher

1993

J of Chemical Tech & Biotech

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Abstract:The reaction products resulting from the interaction between kaolin ore and ammonium sulphate depend on molar ratios between reactants, reaction temperature and time of interaction. The reaction products were characterized by means of XRD. They were composed of silica, unreacted kaolin ore, traces of iron, magnesium, calcium, titanium and NH,Al(SO,), and (NH,),Al(SO,),. The last compound was produced alone at 553 K, whereas mixtures of them were produced between 553 and 823 K after a short time of interaction (0.5 h). On other hand the former compound was produced alone after longer heating (c. 2 h). At 823 K, a mixture composed of Al,(SO,) and NH,AI(SO,), was identified after 0.5 h, whereas anhydrous aluminium sulphate was detected alone after heating the reaction mixture for 2 h. The transformation of (NH,),AI(SO,), into NH,Al(SO,), and alumina leads to a decrease in the percentages of extracted alumina from kaolin ore at relatively higher temperatures and/or longer heating of reaction mixtures. The investigation was also devoted to establishing the possible reactions which lead to the formation of Fe,O,, MgO, CaO and TiO, as soluble salts together with aluminium compounds. The percentages of their extraction are low compared with the original quantities found in kaolin ore. From the obtained results, both Al,(SO,), and NH,Al(SO,), can be prepared from local kaolin with a reasonable degree of purity which makes it possible to produce them for use for different industrial and pharmaceutical purposes.

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Section: Leaching Of Feo From Kaolin Ore By (Nh)somentioning

confidence: 93%

Characterization of products of interaction between kaolin ore and ammonium sulphate

Fouda

Amin

Abd-Elzaher

1993

J of Chemical Tech & Biotech

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Investigation of the Reaction of Roasted Serpentine Ore with Some Ammonium Salts

Abd-Elzaher

1999

J Chinese Chemical Soc

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The reaction between roasted serpentine ore and ammonium sulfate was studied at the range of temperature 250-1000 "C using different molar ratios to determine the maximum extraction of magnesia and also to characterize tbe different reaction products. The maximum extraction of MgO from the roasted ore reached 92.4% at 400 "C. It was found from XRD that ammonium magnesium sulfate [(NH.,),Mg2(S0.J31 was produced as the main product at 400 "C, which decomposes to magnesium sulfate at 500-600 " C . The l a 1 compound decomposes to magnesium oxide at 900-1000 "C. Thermal analysis of the reaction mixture confinned the results obtained by XRD. Extraction of magnesia by ammonium chloride at 300-400 "C showed low percentage of extraction (7.8%). Comparison was made between using ammonium chloride instead of sulfate taking into consideration the thermal decomposition products of both ammonium salts. Extraction of magnesia from the roasted ore by aqueous ammonium sulfate or ammonium chloride showed good results. WTRODUCTIONSerpentine ore is widespread in Egypt and contains a good percentage of magnesia, which could be used in preparation of magnesium compounds. Extraction of magnesia from Egyptian ore using different acids to prepare magnesium compounds has been studied previously.'" The reaction of Egyptian ore with ammonium sulfate has not been studied, and also the effect of roasting on the extraction of magnesia by the same salt have not been studied at different temperatures. The aim of this study is to investigate the reaction between roasted serpentine ore and ammonium sulfate or ammonium chloride using X-my diffraction, thermal, and chemical analyses. to define the various compounds which form in such reactions and to determine the exact temperature of formation or decomposition of tbese compounds. The study extended also to preparing ammonium magnesium sulfate, magnesium sulfate, and magnesium chloride in high purity and by a simple method. A comparison was made between using ammonium chloride instead of ammonium sulfate to define the optimum reaction conditions suitable for extraction of magnesia. EXPERIMENTALThe chemicals used in the present investigation were of Analar grade (Merck). The X-ray diffraction (XRD) patterns of different reaction products were carried out using a Philips diffraclorneter (type PW 1051) employing Ni-filtered Co k, radiation. The X-ray tube was operated at 36 kV and I6 mA. The diffraction angIe was scanned at a rate of 28 per min. Differential Thermal Analysis (DTA) of mixture I11 (ammonium sulfate or ammonium chloride with roasted serpentine) was carried out using a Perkin-Elmer Delta Series (TGA 7) thennoanalyzer. The rate of heating was 10

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Characterization and evaluation of silica fume as an extender pigment for surface coating applications

Youssef

Ahmed²,

El‐Ghaffar³

1998

Pigment & Resin Technology

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Silica waste fume is a byproduct produced in the manufacture of ferrosilicon. The sample, which was very fine and rich in silica, was characterized using chemical and spectrophotometric measurements (XRD and electron microscope). The silica fume was incorporated in anticorrosive paint formulations based on alkyd resin to replace partially or completely the imported diatomaceous silica. The various paint formulations were evaluated and the physico‐mechanical properties as well as the corrosion protection properties of the painted films have been studied. Promising results were achieved, which showed that silica fume can replace satisfactorily the imported diatomaceous silica from the economical and environmental points of view.

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Saving time on cement analysis

Cited by 3 publications

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Characterization of products of interaction between kaolin ore and ammonium sulphate

Characterization of products of interaction between kaolin ore and ammonium sulphate

Investigation of the Reaction of Roasted Serpentine Ore with Some Ammonium Salts

Characterization and evaluation of silica fume as an extender pigment for surface coating applications

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