Assessment of the pollution potential of a special case of abandoned sulfide tailings impoundment in Riotinto mining district (SW Spain)

2020 ◽  
Author(s):  
Julio César Arranz-González ◽  
Virginia Rodríguez-Gómez ◽  
Francisco Javier Fernández-Naranjo ◽  
Lucas Vadillo-Fernández
Keyword(s):  
Mining District ◽  
Pollution Potential ◽  
Sw Spain ◽  
Tailings Impoundment ◽  
Sulfide Tailings ◽  
Special Case

Disposal of acid-bearing and acid-generating sludges in the fertilizer manufacturing industry

1987 ◽  
Vol 14 (1) ◽  
pp. 1-6
Author(s):  
Adrian Smith
Keyword(s):  
Water Pollution ◽  
Manufacturing Industry ◽  
Calcium Sulphate ◽  
Pollution Potential ◽  
Waste Products ◽  
Chemical Attack ◽  
Tailings Impoundment ◽  
Similarities And Differences ◽  
Acid Sludge ◽  
The Impact

Major waste products from fertilizer manufacture are calcine and so-called phosphogypsum, calcium sulphate. The oxidation and leaching of calcine produces a liquid with a high acidity and hence is acid generating. Disposal of phosphogypsum, an acid-bearing waste, is normally effected by construction of a tailings impoundment, similar in nature to those utilized for tailings disposal in the mining industry.This paper addresses the general chemistry, pollution potential, and chemical attack potential of both calcine and phosphogypsum and the impact these have on their disposal. The similarities and differences in the design philosophy for acid-bearing and acid-generating waste facilities are then discussed. Key words: phosphogypsum, acid sludge, fertilizer manufacture, water pollution, waste disposal, calcine, sulphuric acid manufacture.

2009–2017 trends of PM10 in the legendary Riotinto mining district of SW Spain

2020 ◽  
Vol 238 ◽  
pp. 104878 ◽  
Author(s):  
Ana M. Sánchez de la Campa ◽  
Daniel Sánchez-Rodas ◽  
Gonzalo Márquez ◽  
Emilio Romero ◽  
Jesús D. de la Rosa
Keyword(s):  
Mining District ◽  
Sw Spain

Spectroscopic Raman study of sulphate precipitation sequence in Rio Tinto mining district (SW Spain)

2013 ◽  
Vol 21 (11) ◽  
pp. 6783-6792 ◽  
Author(s):  
Fernando Rull ◽  
Julia Guerrero ◽  
Gloria Venegas ◽  
Fernando Gázquez ◽  
Jesús Medina
Keyword(s):  
Mining District ◽  
Precipitation Sequence ◽  
Sw Spain ◽  
Rio Tinto ◽  
Raman Study ◽  
Río Tinto

Extreme self-sacrifice beyond fusion: Moral expansiveness and the special case of allyship

2018 ◽  
Vol 41 ◽  
Author(s):  
Daniel Crimston ◽  
Matthew J. Hornsey
Keyword(s):  
General Theory ◽  
Biological Markers ◽  
Natural Environment ◽  
Relevant Dimension ◽  
Special Case

AbstractAs a general theory of extreme self-sacrifice, Whitehouse's article misses one relevant dimension: people's willingness to fight and die in support of entities not bound by biological markers or ancestral kinship (allyship). We discuss research on moral expansiveness, which highlights individuals’ capacity to self-sacrifice for targets that lie outside traditional in-group markers, including racial out-groups, animals, and the natural environment.

Determination of the phase structure of polymerblends by electron microscopy

1978 ◽  
Vol 36 (1) ◽  
pp. 492-493
Author(s):  
Dr. G. Kaemof
Keyword(s):  
Screw Extruder ◽  
Electron Microscopic ◽  
Thin Sections ◽  
Single Screw Extruder ◽  
Transmission Electron ◽  
The Matrix ◽  
Twin Screw ◽  
Special Case ◽  
Microscopic Investigations

A mixture of polycarbonate (PC) and styrene-acrylonitrile-copolymer (SAN) represents a very good example for the efficiency of electron microscopic investigations concerning the determination of optimum production procedures for high grade product properties.The following parameters have been varied:components of charge (PC : SAN 50 : 50, 60 : 40, 70 : 30), kind of compounding machine (single screw extruder, twin screw extruder, discontinuous kneader), mass-temperature (lowest and highest possible temperature).The transmission electron microscopic investigations (TEM) were carried out on ultra thin sections, the PC-phase of which was selectively etched by triethylamine.The phase transition (matrix to disperse phase) does not occur - as might be expected - at a PC to SAN ratio of 50 : 50, but at a ratio of 65 : 35. Our results show that the matrix is preferably formed by the components with the lower melting viscosity (in this special case SAN), even at concentrations of less than 50 %.

Test Validation Without Measurement

2016 ◽  
Vol 32 (3) ◽  
pp. 204-214 ◽  
Author(s):  
Emilie Lacot ◽  
Mohammad H. Afzali ◽  
Stéphane Vautier
Keyword(s):  
Test Data ◽  
Test Scores ◽  
Scientific Explanation ◽  
Test Validation ◽  
Clinical Tests ◽  
Ethical Perspective ◽  
Power Of Test ◽  
Memory Accuracy ◽  
Social Uses ◽  
Special Case

Abstract. Test validation based on usual statistical analyses is paradoxical, as, from a falsificationist perspective, they do not test that test data are ordinal measurements, and, from the ethical perspective, they do not justify the use of test scores. This paper (i) proposes some basic definitions, where measurement is a special case of scientific explanation; starting from the examples of memory accuracy and suicidality as scored by two widely used clinical tests/questionnaires. Moreover, it shows (ii) how to elicit the logic of the observable test events underlying the test scores, and (iii) how the measurability of the target theoretical quantities – memory accuracy and suicidality – can and should be tested at the respondent scale as opposed to the scale of aggregates of respondents. (iv) Criterion-related validity is revisited to stress that invoking the explanative power of test data should draw attention on counterexamples instead of statistical summarization. (v) Finally, it is argued that the justification of the use of test scores in specific settings should be part of the test validation task, because, as tests specialists, psychologists are responsible for proposing their tests for social uses.

Impact of Digitalization on Service Work in Knowledge-Intensive Business Services: An Empirical Study in Tax Consultancies

2019 ◽  
Vol 3 (4) ◽  
pp. 209-222
Author(s):  
Philipp K. Görs ◽  
Henning Hummert ◽  
Anne Traum ◽  
Friedemann W. Nerdinger
Keyword(s):  
Work Engagement ◽  
Service Work ◽  
Psychological Consequences ◽  
Business Services ◽  
Knowledge Intensive Business Services ◽  
Positive Effects ◽  
Knowledge Intensive ◽  
The Impact ◽  
Positive Effect ◽  
Special Case

Digitalization is a megatrend, but there is relatively little knowledge about its consequences for service work in general and specifically in knowledge-intensive business services (KIBS). We studied the impact of digitalization on psychological consequences for employees in tax consultancies as a special case of KIBS. We compare two tax consulting jobs with very different job demands, those of tax consultants (TCs) and assistant tax consultants (ATCs). The results show that the extent of digitalization at the workplace level for ATCs correlates significantly positively with their job satisfaction. For TCs, the same variable correlates positively with their work engagement. These positive effects of digitalization are mediated in the case of ATCs by the impact on important job characteristics. In the case of TCs, which already have very good working conditions, the impact is mediated by the positive effect on self-efficacy. Theoretical and practical consequences of these results are discussed.

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