scholarly journals DTA and TGA study of MeSo4 (Me = Fe, Co, Ni) dissociation in the presence of coke

2002 ◽  
Vol 38 (1-2) ◽  
pp. 103-116 ◽  
Author(s):  
B.S. Boyanov
Keyword(s):  
Experimental Data ◽  
Industrial Production ◽  
Effect Of Temperature ◽  
Ferrous Metals ◽  
Dissociation Temperature ◽  
Non Ferrous Metals ◽  
Temperature Time

MeSO4 (Me = Fe, Co, Ni) dissociation is investigated in order to estimate the effect of temperature, time and presence of coke as reducer on the degree and mechanism of dissociation. It is proved that the presence of coke decreases the dissociation temperature considerably and increases the degree of MeSO4 dissociation. Based on the obtained experimental data, a mechanism of the processes is proposed. The obtained results can be used in the industrial production of non-ferrous metals for explaining the processes that take place in the reduction of zinc and lead cakes in order to achieve favorable environmental, technical and economic results.

VARIABLES INFLUENCING THE PREPARATION OF INFLUENZA VACCINES WITH FORMALDEHYDE

1959 ◽  
Vol 5 (2) ◽  
pp. 237-244 ◽  
Author(s):  
John R. Polley
Keyword(s):  
Experimental Data ◽  
Influenza Vaccines ◽  
Effect Of Temperature ◽  
Virus Inactivation ◽  
Large Margin ◽  
Margin Of Safety ◽  
Temperature Time

The effect of temperature, time of treatment, and the pH of the medium on the preparation of influenza vaccines with formaldehyde has been studied. It was found that both the infectivity and the hemagglutinin were destroyed more quickly as the pH was increased above pH 6 and the margin of safety that exists between virus inactivation and loss of antigenicity increased as the pH was decreased to about 6. From the experimental data it was possible to select numerous conditions of treatment which had a large margin of safety between virus inactivation and loss of antigenicity. Vaccines prepared with formaldehyde under various conditions and then lyophilized had retained their antigenicity after storage for [Formula: see text] years.

Modeling bioaugmentation with nitrifiers in membrane bioreactors

2014 ◽  
Vol 71 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Alberto Mannucci ◽  
Giulio Munz ◽  
Gualtiero Mori ◽  
Jacek Makinia ◽  
Claudio Lubello ◽  
...  
Keyword(s):  
Experimental Data ◽  
Linear Correlation ◽  
State Of The Art ◽  
Pilot Scale ◽  
Membrane Bioreactors ◽  
Operating Conditions ◽  
Effect Of Temperature ◽  
Preliminary Step ◽  
Temperature Time ◽  
Activated Sludge Models

Bioaugmentation with nitrifiers was studied using two pilot-scale membrane bioreactors, with the purpose of assessing the suitability of state-of-the-art activated sludge models (ASMs) in predicting the efficiency of bioaugmentation as a function of operating conditions. It was demonstrated that the temperature difference between seeding and seeded reactors (ΔT) affects bioaugmentation efficiency. Experimental data were accurately predicted when ΔT was within a range of up to 10 °C at the higher range, and when the temperature was significantly lower in the seeded reactor compared to the seeding one, standard ASMs overestimated the efficiency of bioaugmentation. A modified ASM, capable of accurately representing the behavior of seeded nitrifying biomass in the presence of high ΔT, would require the inclusion of the effect of temperature time gradients on nitrifiers. A simple linear correlation between ΔT and the Arrhenius coefficient was proposed as a preliminary step.

scholarly journals Probability-Statistical Estimation Method of Feed Influence on As-Turned Finish of Steels and Non-Ferrous Metals

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 965 ◽  
Author(s):  
Petro Kryvyi ◽  
Volodymyr Dzyura ◽  
Nadiya Tymoshenko ◽  
Pavlo Maruschak ◽  
Justas Nugaras ◽  
...  
Keyword(s):  
Experimental Data ◽  
Statistical Estimation ◽  
Cutting Tool ◽  
Estimation Method ◽  
Roughness Parameter ◽  
Small Sample ◽  
Ferrous Metals ◽  
The Mean ◽  
Non Ferrous Metals ◽  
Turning Test

Based on the experimental data on the roughness parameter Ra, which stands for the mean arithmetic deviation of the profile, as obtained in the process of turning test specimens from different materials with constant elements of the cutting mode (depth a and velocity v) and structural-geometric parameters of the cutting tool, but with different feed rates f, the probability-statistical method for estimating the influence of feed rate f on the resulting surface roughness by the parameter Ra is proposed using the theory of a small sample.

scholarly journals Hydrochemical cleaning of gold-containing cathode deposits from heavy non-ferrous metal impurities

2020 ◽  
Vol 24 (5) ◽  
pp. 1126-1136
Author(s):  
Viktoria Zhmurova ◽  
Keyword(s):  
Experimental Data ◽  
Chemical Composition ◽  
Hydrochloric Acid ◽  
Mass Fraction ◽  
Ferrous Metal ◽  
Precious Metals ◽  
Dispersion Analysis ◽  
Ferrous Metals ◽  
Gold Silver ◽  
Non Ferrous Metals

The purpose of this paper is to conduct the research on hydrochloric acid cleaning of gold-containing cathode deposits from the impurities of heavy non-ferrous metals and mathematical processing of the experimental data obtained by the method of dispersion analysis. The atomic absorption method is used to study the chemical composition of the cathode deposits. The method of dispersion analysis is used to process experimental data. The composition of cathode deposit impurities is studied using x-ray spectral microanalysis. The study of the chemical composition of cathode deposits has shown that their main components are gold, silver, copper, lead, as well as non-metallic impurity compounds (CaO, SiO2, etc.). It is found that the optimal concentration of hydrochloric acid for cleaning gold-containing cathode deposits from heavy non-ferrous metals is 371 kg/m3; the degree of copper transition to solution is 69.06%, lead - 93.9%. The calculation of the expected mass fraction of precious metals in the alloyed gold demonstrates an increase in the mass fraction of gold by 14.08%, silver - by 17.46%. The study of the chemical composition of cathode deposits has also revealed that the main impurities that affect their subsequent processing are copper and lead. The latter fall into the ingot of alloyed gold, which is the target product of gold-bearing ore processing and complicate subsequent refining. The dispersion analysis of experimental data shows that solvent concentration significantly affects the transition degree of heavy non-ferrous metals to the solution starting from the value of 20.1 kg/m3. It is shown that the proposed method allows to increase the content of precious metals in the alloyed gold by 31.54%, as well as to perform maximum transition of copper and lead to the solution. The use of acid leaching of impurities from cathode deposits obtained by cyanide-sorption technology is one of the promising directions for improving the quality of gold-containing alloys and hence the reduction of the cost of refining services.

scholarly journals A STUDY OF WASTES GENERATED IN THE PRODUCTION OF LEAD

2018 ◽  
pp. 43-49
Author(s):  
S. L. Rovin ◽  
S. V. Grigoriev
Keyword(s):  
Technological Regimes ◽  
Lead Acid Batteries ◽  
Ferrous Metals ◽  
Time Regime ◽  
Non Ferrous Metals ◽  
Temperature Time ◽  
Metal Wastes ◽  
Lead Acid

Lead-containing wastes amount to more than half of the waste of non-ferrous metals formed in Belarus. At the same these wastes are the least studied and the most toxic of the metal wastes. The bulk of them consists of lead-acid batteries, 50–60% of the mass of which is oxide-sulphate lead paste. The article presents the results of a study of the composition and properties of characteristic lead-containing wastes generated both in the operation of lead-containing products and in the production of lead (slag, dust aspiration, etc.). Obtained data allow to optimize the technological regimes of processing of wastes: consumption of fluxes and temperature – time regime of the lead melting.

Chapter II. Industrial Production

1976 ◽  
Vol 75 ◽  
pp. 23-32
Keyword(s):  
Industrial Production ◽  
Manufacturing Sector ◽  
Manufacturing Industries ◽  
Average Level ◽  
Capacity Utilisation ◽  
The Third ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Slight Rise ◽  
Short Time

The decline in industrial production, which began in the third quarter of 1974, continued during 1975 until in the third quarter output reached 1970's average level. However, there was a slight rise of 1 per cent in the last quarter. For the year as a whole the all-industries index was 4½ per cent lower than in 1974; the index for manufacturing industries' production fell further (5½ per cent) because it does not include mining and quarrying output, which increased by more than 9 per cent over the year. Apart from mining and quarrying, the only sectors which showed any growth were drink and tobacco, shipbuilding, and aerospace and other vehicles. In the manufacturing sector several industries—coal and petroleum, ferrous metals, non-ferrous metals, pottery and glass, and paper, printing and publishing—fell by more than 10 per cent; the largest fall was in the manufacture of ferrous metals. The output of all engineering and allied industries taken together dropped by 4 per cent, considerably less than the decline in total manufacturing production. All the main indicators of surplus capacity, namely unemployment, orders on hand, short-time working, vacancies, and deviation from trend output, show that the level of capacity utilisation is extremely low.

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