Study on Extraction of Alumina from Sericite Phyllite

2013 ◽  
Vol 544 ◽  
pp. 38-42 ◽  
Author(s):  
Hong Wei Zhao ◽  
Kai Qi Liu ◽  
Zhuang Li ◽  
Zhao Hui Huang
Keyword(s):  
Dissolution Rate ◽  
Mineral Resources ◽  
The Self ◽  
Liquid Ratio ◽  
Technological Parameters ◽  
Hexagonal Plate ◽  
Solid Liquid ◽  
Leaching Reaction ◽  
The Way

Alumina from sericite phyllite was extracted by the way of limestone self-pulverization sintering technique. The key technical processes, including self-pulverization sintering, clinker leaching reaction and the carbonation decomposition, were investigated systematically. The results showed that the main phases of pulverized clinker consisted of γ-C2S and C12A7, and the self-pulverization rate was 95% . The dissolution rate of Al2O3 clinker could reach 86.7% when the concentration of Na2CO3 solution was 7% and the solid-liquid ratio was 1:3. The Al(OH)3 prepared at 80°C carbonation temperature and pH=10.5 was relatively pure, with hexagonal plate-like crystals. The α-alumina could be acquired by calcination at 1200°C with the content of 99.71% Al2O3 and 0.02% Na2O. This work provided optimal technological parameters for effectively extracting alumina from the sericite and other inexpensive non-bauxite mineral resources with A/S ratio lower than 1.

AN 80 °C. ISOTHERMAL CALORIMETER

1950 ◽  
Vol 28b (10) ◽  
pp. 579-592 ◽  
Author(s):  
C. C. Coffin ◽  
J. C. Devins ◽  
J. R. Dingle ◽  
J. H. Greenblatt ◽  
T. R. Ingraham ◽  
...  
Keyword(s):  
Melting Point ◽  
Volume Change ◽  
Capillary Tube ◽  
Benzene Vapor ◽  
Liquid Ratio ◽  
Isothermal Calorimeter ◽  
Solid Liquid ◽  
The Way

An 80° isothermal naphthalene calorimeter analogous to the Bunsen ice calorimeter has been constructed and calibrated. The heat to be measured is made to change the solid/liquid ratio of naphthalene at its melting point, and the resulting volume change is determined by the displacement of mercury in a horizontal capillary tube. The naphthalene chamber is surrounded by the vapor of benzene boiling under an automatically controlled pressure at the melting point of naphthalene. The benzene vapor and the partially frozen naphthalene are separated by an evacuated space.This 80° calorimeter is four times as sensitive as the ice calorimeter and is much more convenient to operate. It is readily adapted to micro work and can be used for fast or slow endothermic or exothermic processes. In the setup described, heats up to about 400 cal. may be measured with a reproducibility of the order of 0.1%. Two different methods of calibration, however, gave "constants" differing by almost 1%. It is thus evident that the instrument must be calibrated as nearly as possible in the way in which it is to be used.

Study on Extracting Technology of Vc from Momordica charantia

2013 ◽  
Vol 781-784 ◽  
pp. 606-609
Author(s):  
Chen Guang Jiang ◽  
Qing Jie Tang
Keyword(s):  
Extraction Yield ◽  
Orthogonal Test ◽  
Ultrasonic Extraction ◽  
Ultrasonic Power ◽  
Extraction Temperature ◽  
Liquid Ratio ◽  
Technological Parameters ◽  
Test Analysis ◽  
Solid Liquid ◽  
Temperature Time

Balsam pear was used as the research object in experiment, the technological parameters were studied such as the way of crushing, leaching agent type and its concentration, solid-liquid ratio, ultrasonic extraction temperature, time, power's influence on the extraction yield of Vc, and the ultrasonic extraction time, temperature, ultrasonic power on the L9 (34) orthogonal test analysis. Results showed that bitter melon slices, and solid-liquid ratio is 1:7, citric acid as leaching agent and the concentration of 1%, ultrasonic power is 80 w, leaching temperature 30 °C, 40 min leaching time, leaching of balsam pear Vc the highest rate.

scholarly journals The Use of Artificial Neural Network for Prediction of Dissolution Kinetics

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
H. Elçiçek ◽  
E. Akdoğan ◽  
S. Karagöz
Keyword(s):  
Dissolution Rate ◽  
Dissolution Kinetics ◽  
Liquid Ratio ◽  
Cleaning Agents ◽  
Alternative Approach ◽  
Boron Minerals ◽  
Multilayered Perceptron ◽  
Artificial Neural ◽  
Water Saturated ◽  
Solid Liquid

Colemanite is a preferred boron mineral in industry, such as boric acid production, fabrication of heat resistant glass, and cleaning agents. Dissolution of the mineral is one of the most important processes for these industries. In this study, dissolution of colemanite was examined in water saturated with carbon dioxide solutions. Also, prediction of dissolution rate was determined using artificial neural networks (ANNs) which are based on the multilayered perceptron. Reaction temperature, total pressure, stirring speed, solid/liquid ratio, particle size, and reaction time were selected as input parameters to predict the dissolution rate. Experimental dataset was used to train multilayer perceptron (MLP) networks to allow for prediction of dissolution kinetics. Developing ANNs has provided highly accurate predictions in comparison with an obtained mathematical model used through regression method. We conclude that ANNs may be a preferred alternative approach instead of conventional statistical methods for prediction of boron minerals.

Vérités et Mensonges

2020 ◽  
Vol 39 (2) ◽  
pp. 188-224
Author(s):  
Erik Gunderson
Keyword(s):  
Theory And Practice ◽  
The Self ◽  
Faithful Representation ◽  
Political Subject ◽  
Concrete Reality ◽  
Hermeneutic Process ◽  
The Way

This is a survey of some of the problems surrounding imperial panegyric. It includes discussions of both the theory and practice of imperial praise. The evidence is derived from readings of Cicero, Quintilian, Pliny, the Panegyrici Latini, Menander Rhetor, and Julian the Apostate. Of particular interest is insincere speech that would be appreciated as insincere. What sort of hermeneutic process is best suited to texts that are politically consequential and yet relatively disconnected from any obligation to offer a faithful representation of concrete reality? We first look at epideictic as a genre. The next topic is imperial praise and its situation “beyond belief” as well as the self-positioning of a political subject who delivers such praise. This leads to a meditation on the exculpatory fictions that these speakers might tell themselves about their act. A cynical philosophy of Caesarism, its arbitrariness, and its constructedness abets these fictions. Julian the Apostate receives the most attention: he wrote about Caesars, he delivered extant panegyrics, and he is also the man addressed by still another panegyric. And in the end we find ourselves to be in a position to appreciate the way that power feeds off of insincerity and grows stronger in its presence.

Why Phenomenology?

2018 ◽  
Author(s):  
George Pattison
Keyword(s):  
Twentieth Century ◽  
Subject Matter ◽  
Alternative Model ◽  
Phenomenological Approach ◽  
Human Existence ◽  
Present Approach ◽  
The Self ◽  
Existence Of God ◽  
Pure Intuition ◽  
The Way

This chapter sets out the rationale for adopting a phenomenological approach to the devout life literature. Distinguishing the present approach from versions of the phenomenology of religion dominant in mid-twentieth-century approaches to religion, an alternative model is found in Heidegger’s early lectures on Paul. These illustrate that alongside its striving to achieve a maximally pure intuition of its subject matter, phenomenology will also be necessarily interpretative and existential. Although phenomenology is limited to what shows itself and therefore cannot pass judgement on the existence of God, it can deal with God insofar as God appears within the activity and passivity of human existence. From Hegel onward, it has also shown itself open to seeing the self as twofold and thus more than a simple subjective agent, opening the way to an understanding of the self as essentially spiritual.

The Well-Mannered Auditor

2018 ◽  
Author(s):  
James Deaville
Keyword(s):  
Nineteenth Century ◽  
English Language ◽  
The Self ◽  
Modern World ◽  
Music Making ◽  
Social Events ◽  
Drawing Room ◽  
The Way

The chapter explores the way English-language etiquette books from the nineteenth century prescribe accepted behavior for upwardly mobile members of the bourgeoisie. This advice extended to social events known today as “salons” that were conducted in the domestic drawing room or parlor, where guests would perform musical selections for the enjoyment of other guests. The audience for such informal music making was expected to listen attentively, in keeping with the (self-) disciplining of the bourgeois body that such regulations represented in the nineteenth century. Yet even as the modern world became noisier and aurally more confusing, so, too, did contemporary social events, which led authors to become stricter in their disciplining of the audience at these drawing room performances. Nevertheless, hosts and guests could not avoid the growing “crisis of attention” pervading this mode of entertainment, which would lead to the modern habit of inattentive listening.

scholarly journals Preparation and Characterization of the Sulfur-Impregnated Natural Zeolite Clinoptilolite for Hg(II) Removal from Aqueous Solutions

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 217
Author(s):  
Marin Ugrina ◽  
Martin Gaberšek ◽  
Aleksandra Daković ◽  
Ivona Nuić
Keyword(s):  
Chemical Modification ◽  
Aqueous Solutions ◽  
Specific Surface ◽  
Surface Area ◽  
Natural Zeolite ◽  
Contact Time ◽  
Liquid Ratio ◽  
X Ray ◽  
Solid Liquid

Sulfur-impregnated zeolite has been obtained from the natural zeolite clinoptilolite by chemical modification with Na2S at 150 °C. The purpose of zeolite impregnation was to enhance the sorption of Hg(II) from aqueous solutions. Chemical analysis, acid and basic properties determined by Bohem’s method, chemical behavior at different pHo values, zeta potential, cation-exchange capacity (CEC), specific surface area, X-ray powder diffraction (XRPD), scanning electron microscopy with energy-dispersive X-ray analysis (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), as well as thermogravimetry with derivative thermogravimetry (TG-DTG) were used for detailed comparative mineralogical and physico-chemical characterization of natural and sulfur-impregnated zeolites. Results revealed that the surface of the natural zeolite was successfully impregnated with sulfur species in the form of FeS and CaS. Chemical modification caused an increase in basicity and the net negative surface charge due to an increase in oxygen-containing functional groups as well as a decrease in specific surface area and crystallinity due to the formation of sulfur-containing clusters at the zeolite surface. The sorption of Hg(II) species onto the sulfur-impregnated zeolite was affected by the pH, solid/liquid ratio, initial Hg(II) concentration, and contact time. The optimal sorption conditions were determined as pH 2, a solid/liquid ratio of 10 g/L, and a contact time of 800 min. The maximum obtained sorption capacity of the sulfur-impregnated zeolite toward Hg(II) was 1.02 mmol/g. The sorption mechanism of Hg(II) onto the sulfur-impregnated zeolite involves electrostatic attraction, ion exchange, and surface complexation, accompanied by co-precipitation of Hg(II) in the form of HgS. It was found that sulfur-impregnation enhanced the sorption of Hg(II) by 3.6 times compared to the natural zeolite. The leaching test indicated the retention of Hg(II) in the zeolite structure over a wide pH range, making this sulfur-impregnated sorbent a promising material for the remediation of a mercury-polluted environment.

scholarly journals Photodegradation of Phenolic Compounds from Water in the Presence of a Pd-Containing Exhausted Adsorbent

2020 ◽  
Vol 10 (23) ◽  
pp. 8440
Author(s):  
Lavinia Lupa ◽  
Laura Cocheci ◽  
Bogdan Trica ◽  
Adina Coroaba ◽  
Adriana Popa
Keyword(s):  
Phenol Degradation ◽  
Magnesium Silicate ◽  
Degradation Process ◽  
Liquid Ratio ◽  
Phenol Solution ◽  
Secondary Sources ◽  
Great Economic Importance ◽  
Phenol Photodegradation ◽  
Cyphos Il 101 ◽  
Solid Liquid

A closed-cycle technology regarding the use of an exhausted Pd-based adsorbent as a photocatalyst in the degradation process of phenol is presented. Pd (II) represents a precious metal of great economic importance. Its obtained from natural sources become more difficult to achieve. Therefore, also considering the regulations of the “circular economy,” its recovery from secondary sources turn out to be a stringent issue in the last years. Pd(II) ions are removed from aqueous solution through adsorption onto Florisil (an inorganic solid support—magnesium silicate) impregnated with Cyphos IL 101 (trihexyl tetradecyl phosphonium chloride). It was observed that the presence of the ionic liquid (IL) in the adsorbent structure doubles the adsorption efficiency of the studied materials. The newly obtained Pd-based photocatalyst was exhaustively characterized and was used in the degradation process of phenol from aqueous solutions. The phenol degradation process was studied in terms of the nature of the photocatalyst used, time of photodegradation and solid: liquid ratio. It was observed that both the presence of IL and Pd lead to an increase in the efficiency of the phenol degradation process. The new Pd-based photocatalyst could be efficiently used in more cycles of phenol photodegradation processes. When is used as a photocatalyst the Florisil impregnated with IL and loaded with 2 mg/g of Pd, a degree of mineralization of 93.75% is obtained after 180 min of irradiation of a phenol solution having a concentration of 20 mg/L and using a solid:liquid ratio = 1:1.

Kierkegaard, Metaphysics, and Love

2013 ◽  
Vol 2013 (1) ◽  
Author(s):  
George Pattison
Keyword(s):  
Sense Of Self ◽  
The Self ◽  
The Other ◽  
Gabriel Marcel ◽  
The Core ◽  
The Dead ◽  
Alternative Reading ◽  
The Way

AbstractNoting Heidegger’s critique of Kierkegaard’s way of relating time and eternity, the paper offers an alternative reading of Kierkegaard that suggests Heidegger has overlooked crucial elements in the Kierkegaardian account. Gabriel Marcel and Sharon Krishek are used to counter Heidegger’s minimizing of the deaths of others and to show how the deaths of others may become integral to our sense of self. This prepares the way for revisiting Kierkegaard’s discourse on the work of love in remembering the dead. Against the criticism that this reveals the absence of the other in Kierkegaardian love, the paper argues that, on the contrary, it shows how Kierkegaard conceives the self as inseparable from the core relationships of love that, despite of death, constitute it as the self that it is.

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