Leaching of lead slag component by sodium chloride and diluted nitric acid and synthesis of ultrafine lead oxide powders

2015 ◽  
Vol 281 ◽  
pp. 219-226 ◽  
Author(s):  
Yuehong Shu ◽  
Cheng Ma ◽  
Longguan Zhu ◽  
Hongyu Chen
Keyword(s):  
Nitric Acid ◽  
Sodium Chloride ◽  
Lead Oxide ◽  
Oxide Powders ◽  
Slag Component

DETERMINATION OF TRACE AMOUNTS OF SILVER IN GALENA ORES

1960 ◽  
Vol 38 (9) ◽  
pp. 1488-1494 ◽  
Author(s):  
E. J. Bounsall ◽  
W. A. E. McBryde
Keyword(s):  
Aqueous Solution ◽  
Nitric Acid ◽  
Sodium Chloride ◽  
Hydrochloric Acid ◽  
Chloride Solution ◽  
Sodium Chloride Solution ◽  
Silver Content ◽  
Aqueous Sodium Chloride Solution ◽  
Aqueous Sodium

An analytical method is described for the determination of microgram amounts of silver in galena ores, based on the "reversion" of silver dithizonate. Silver is separated from relatively large amounts of lead by extraction as dithizonate into chloroform from an aqueous 1:99 nitric acid solution. Separation from mercury, which is also extracted under these conditions and would, if present, interfere in the analysis, is achieved by reverting the dithizonate solution with a 5% aqueous sodium chloride solution which is also 0.015 molar in hydrochloric acid. Following dilution of this aqueous solution and adjustment of pH, silver is again extracted into chloroform as the dithizonate, and determined absorptiometrically. Analyses of a number of galena ore samples showed a precision of within 3% for a silver content ranging from 0.03 to 0.4%.Some other methods for isolating silver from these samples, which were tried but found unsatisfactory, are discussed.

scholarly journals Separation of tungsten and rhenium on alumina

2004 ◽  
Vol 69 (8-9) ◽  
pp. 683-688 ◽  
Author(s):  
Jurij Vucina ◽  
Dagoljub Lukic ◽  
Milovan Stoiljkovic
Keyword(s):  
Nitric Acid ◽  
Sodium Chloride ◽  
Aqueous Phase ◽  
Aqueous Media ◽  
Distribution Coefficients ◽  
Experimental Conditions ◽  
Efficient Separation ◽  
Separation Factors ◽  
Ph Range

The conditions for the efficient separation of tungsten(VI) and rhenium (VII) on alumina were established. The distribution coefficients K d for tungstate and perrhenate anions, as well as the separation factors ?(? = KdWO42-/Kd ReO4-) were determined using hydrochloric or nitric acid as the aqueous media. Asolution of sodium chloride in the pH range 2?6 was also examined. Under all the tested experimental conditions, alumina is a much better adsorbent for tungsten than for rhenium. The obtained results indicated that the best separation of these two elements is achieved when 0.01? 0.1 mol dm-3HCl or 1.0mol dm-3 HNO3 are used as the aqueous media. If NaCl is used as the aqueous phase, the best separation is achieved with 0.20 mol dm-3 NaCl pH 4?6. Under these experimental conditions, the breakthrough and saturation capacities of alumina for tungsten at pH4 are 17 and 26 mg W/g Al2O3 respectively. With increasing pH, these values decrease. Thus, at pH 6 they are only 4 and 13 mg W/g Al2O3, respectively.

Lead Oxide Plate Precipitates from Lead Nitrate Solution

2010 ◽  
Vol 123-125 ◽  
pp. 1243-1246
Author(s):  
Gang Qiang Yang ◽  
Xiao Ping Zou ◽  
Xiang Min Meng ◽  
Jin Cheng ◽  
Xue Ming Lü ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Sodium Chloride ◽  
Lead Oxide ◽  
Nitrate Solution ◽  
Lead Nitrate ◽  
Chloride Anion ◽  
Distilled Water ◽  
Lead Monoxide ◽  
Reaction Solution ◽  
Nitrate Solutions

In this paper, a simple and controllable method to fabricate - and -PbO is reported. Lead nitrate as precursor was dissolved in 50ml distilled water, and was heated to 80oC. Sodium chloride was added into the lead nitrate aqueous solution. During the process, -PbO deposition will be obtained when we add lead nitrate solutions with KOH pellets without chloride anion. When we add lead nitrate solutions with KOH pellets with a little chloride anion, there will produce -PbO deposition. Our results indicate that the concentration of chloride anion and temperature of reaction solution affects the crystal morphologies and modifications of lead monoxide plate precipitates from lead nitrate solution and we can selectively and controllably produce - or -PbO by this way.

scholarly journals Corrosion, Passivity and Pitting of Inconel (600) in Sulphuric Acid

2016 ◽  
Vol 13 (2) ◽  
pp. 40-47
Author(s):  
Baghdad Science Journal
Keyword(s):  
Nitric Acid ◽  
Sodium Chloride ◽  
Hydrochloric Acid ◽  
Sulphuric Acid ◽  
Current Density ◽  
Film Formation ◽  
Corrosion Current ◽  
Inconel 600 ◽  
Passive Transition ◽  
Current Densities

A potentiostatic study of the behaviour of Inconel (600) in molar sulphuric acid has been carried out over the temperature range 293-313 K. Values have been established for the potentials and current densities of the corrosion, active-passive transition, passivity and transpassive states. For corrosion, the current density (ic) and potential (Ec) have been determined from well-defined Tafel lines. The potential and current density prior to the commencement of passivity have been obtained corresponding respectively to the critical potential (Ecr( and to the current density (icr) for the active-passive transition state. The passive range was defined by the respective potentials and current densities for passive film formation and dissolution. The dissolution point was correlated with transpassive potential (Et) and current density (it). All the estimated potentials and current densities for the various states were influenced by temperature and the presence of additives in the sulphuric acid. Additives such as nitric acid, thiourea and sodium chloride lowered the corrosion current density (ic) of the alloy while hydrochloric acid enhanced the value of ic. Addition of thiourea or sodium chloride or hydrochloric acid caused a shift in the corrosion potential (Ec) to less negative values while nitric acid shifted Ec to more negative potentials. The kinetic effect of the additives have been studies. Values of activation energy (E) were considered to be apparent and some negative values of E have been obtained with certain additives for the critical and passivity processes. Such negative E values were attributed to small values of true energies of activation together with relatively large exothermic enthalpies of such processes.

scholarly journals Leaching of lead from sphalerite concentrate direct leaching residue by hydrochloric acid and sodium chloride for preparation of lead oxides

2020 ◽  
Vol 56 (2) ◽  
pp. 247-255
Author(s):  
Y.-Y. Fan ◽  
Y. Liu ◽  
L.-P. Niu ◽  
T. Jing ◽  
T.-A. Zhang
Keyword(s):  
Sodium Chloride ◽  
Hydrochloric Acid ◽  
Chloride Concentration ◽  
Sodium Oxalate ◽  
Hydrochloric Acid Concentration ◽  
Solid Ratio ◽  
Oxide Powders ◽  
Optimum Parameters ◽  
Leaching Residue ◽  
Direct Leaching

The purpose of this study was to select and propose an applicable method for extracting lead from sphalerite concentrate direct leaching residue. A large number of experiments were conducted to extract lead from sphalerite concentrate direct leaching residue by hydrochloric acid and sodium chloride solution as leachates. The main optimum parameters were determined, such as a liquid-solid ratio of 17.5-1, a reaction temperature of 85?C, an initial hydrochloric acid concentration of 1.3 mol/L, an initial sodium chloride concentration of 300 g/L, and a reaction time of 60 min. Ninety-five percent of the zinc, 96.0% of the iron, and 93.7% of the lead were extracted into leachate at the optimum conditions. The lead in the leachate was in the form of [PbCl4]2-. After the leachate was purified to remove impurities, it was converted into lead oxalate by sodium oxalate as a precipitant. Finally, lead oxalate was decomposed to obtain lead oxide powders via a high-temperature calcination process.

Reactive Uptake of Nitric Acid onto Sodium Chloride Aerosols Across a Wide Range of Relative Humidities

2006 ◽  
Vol 110 (24) ◽  
pp. 7614-7620 ◽  
Author(s):  
Thomas D. Saul ◽  
Michael P. Tolocka ◽  
Murray V. Johnston
Keyword(s):  
Nitric Acid ◽  
Sodium Chloride ◽  
Wide Range
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