Dissolution of Mixed Zinc-Carbon and Alkaline Battery Powders in Sulphuric Acid Using Ascorbic/Oxalic Acid as a Reductant

2012 ◽  
pp. 271-287
Author(s):  
Muammer Kaya ◽  
Sait Kursunoglu
Keyword(s):  
Oxalic Acid ◽  
Sulphuric Acid ◽  
Alkaline Battery

Phosphorus recovery from the sludge generated from a continuous bipolar mode electrocoagulation (CBME) system

2019 ◽  
Vol 79 (7) ◽  
pp. 1348-1356 ◽  
Author(s):  
M. Damaraju ◽  
H. Yoshihara ◽  
D. Bhattacharyya ◽  
T. K. Panda ◽  
K. K. Kurilla
Keyword(s):  
Oxalic Acid ◽  
Sulphuric Acid ◽  
Acid Leaching ◽  
Renewable Resource ◽  
Phosphorus Recovery ◽  
Raw Material ◽  
Time Intervals ◽  
Operational Conditions ◽  
Bipolar Mode ◽  
Palm Oil Mill

Abstract Phosphorus is known to be a limited non-renewable resource. Phosphorus is obtained from phosphate rock, which is likely to be depleted in the next few decades. Therefore, it is very important to find alternate sources of phosphorus from which phosphorus can be recycled and recovered. This study focuses on the recovery of phosphorus from the sludge generated from a continuous bipolar mode electrocoagulation (CBME) system, used for treating a palm oil mill effluent (POME). The sludge generated from the CBME system is leached with oxalic acid and sulphuric acid for phosphorus recovery with and without thermal treatment. Acid leaching was carried out at various time intervals using various liquid/solid (L/S) ratios of acids and sludge. The CBME system caused a 73% removal of phosphorus from POME, where phosphorus is precipitated in sludge as iron phosphates or adsorbed as phosphates depending on the pH in the system. Acid leaching resulted in nearly 85% recovery of phosphorus with both sulphuric acid and oxalic acid for sludge combusted at 900 °C. Statistical analysis was carried out to find the significance of the operational conditions on the phosphorus yield. Acid leaching results in the formation of orthophosphates, which can be used as a raw material for synthesis of chemical fertilizers.

scholarly journals Kinetics of Manganese Oxides Dissolution in Sulphuric Acid Solutions Containing Oxalic Acid

Engineering ◽  
2013 ◽  
Vol 05 (09) ◽  
pp. 714-719 ◽  
Author(s):  
I. V. Artamonova ◽  
I. G. Gorichev ◽  
E. B. Godunov
Keyword(s):  
Oxalic Acid ◽  
Sulphuric Acid ◽  
Manganese Oxides ◽  
Acid Solutions ◽  
Kinetics Of

Oscillations of bromine in Belousov-Zhabotinskii type reaction with oxalic acid

1985 ◽  
Vol 50 (7) ◽  
pp. 1450-1456
Author(s):  
Peter Ševčík ◽  
Jana Dubovská
Keyword(s):  
Oxalic Acid ◽  
Sulphuric Acid ◽  
Oxidation State ◽  
Oscillation Cycle ◽  
Type Reaction ◽  
Oscillation Reaction ◽  
Induced Reaction

The authors studied the influence of the concentrations of reactants and catalysts on the parameters of the catalysed oscillation reaction of bromate ions with oxalic acid in the medium of sulphuric acid. Ce(IV) and Mn(III) ions induce the reaction of bromine in the oxidation state either +1 or 0 with oxalic acid. In the presence of bromate ions, the induced reaction can lead to the formation of the same quantity of bromine as in the first oscillation cycle of the oscillation reaction.

Experiments on the gas voltaic battery, with a view of ascertaining the rationale of its action and on its application to eudiometry

1843 ◽  
Vol 4 ◽  
pp. 463-465
Keyword(s):  
Oxalic Acid ◽  
Sulphuric Acid ◽  
Carbonic Acid ◽  
The Other ◽  
Philosophical Magazine ◽  
Faraday’S Law ◽  
New Apparatus ◽  
Series Of Experiments ◽  
The One ◽  
Decomposition Of Water

The author, referring to a paper published in the Philosophical Magazine for December 1842, giving an account of a voltaic battery of which the active ingredients are gases, and by which the decomposition of water is effected by means of its composition, describes several variations in the form of the apparatus recorded in that paper. The experiments he has made with this new apparatus, and the details of which occupy the greater part of the present memoir, he conceives establish the conclusion that the phenomena exhibited in the gaseous battery are in strict conformity with Faraday’s law of definite electrolysis. They also confirm him in the opinion which he had expressed in his original paper, and which had been controverted by Dr. Schœnbein, in a communication to the Philosophical Magazine for March 1843, as well as by other philosophers, namely, that the oxygen, in that battery, immediately contributes to the production of the voltaic current. Besides employing as the active agents oxygen and hydrogen gases, he extends his experiments to the following combinations: namely, Oxygen and peroxide of nitrogen; Oxygen and protoxide of nitrogen; Oxygen and olefiant gas; Oxygen and carbonic oxide; Oxygen and chlorine; Chlorine and dilute sulphuric acid; Chlorine and solutions of bromine and iodine in alternate tubes; Chlorine and hydrogen; Hydrogen and carbonic oxide; Chlorine and olefiant gas; Oxygen and binoxide of nitrogen; Oxygen and nitrogen, with solution of sulphate of ammonia; Carbonic acid and carbonic oxide, with oxalic acid as an electrolyte; Hydrogen, nitrogen, and sulphate of ammonia. The author concludes, on reviewing the whole of this series of experiments, that, with the exception, perhaps, of olefiant gas, which appears to give rise to an extremely feeble current, chlorine and oxygen, on the one hand, and hydrogen and carbonic oxide, on the other, are the only gases which are decidedly capable of electro-synthetically combining so as to produce a voltaic current. He thinks that the vapours of bromine and of iodine, were they less soluble, would probably also be found efficient as electro-negative gases.

scholarly journals Usage of Neural Network to Predict Aluminium Oxide Layer Thickness

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Peter Michal ◽  
Alena Vagaská ◽  
Miroslav Gombár ◽  
Ján Kmec ◽  
Emil Spišák ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
Oxide Layer ◽  
Sulphuric Acid ◽  
Aluminium Oxide ◽  
Acid Amount ◽  
Marquardt Algorithm ◽  
Current Densities ◽  
Neural Unit ◽  
The Impact ◽  
Aluminium Oxide Layer

This paper shows an influence of chemical composition of used electrolyte, such as amount of sulphuric acid in electrolyte, amount of aluminium cations in electrolyte and amount of oxalic acid in electrolyte, and operating parameters of process of anodic oxidation of aluminium such as the temperature of electrolyte, anodizing time, and voltage applied during anodizing process. The paper shows the influence of those parameters on the resulting thickness of aluminium oxide layer. The impact of these variables is shown by using central composite design of experiment for six factors (amount of sulphuric acid, amount of oxalic acid, amount of aluminium cations, electrolyte temperature, anodizing time, and applied voltage) and by usage of the cubic neural unit with Levenberg-Marquardt algorithm during the results evaluation. The paper also deals with current densities of 1 A·dm−2and 3 A·dm−2for creating aluminium oxide layer.

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