scholarly journals Use of depressants in the direct flotation of a silicate-carbonate phosphate ore

2014 ◽  
Vol 67 (2) ◽  
pp. 191-196
Author(s):  
Adalberto Leles de Souza ◽  
Rodrigo Oscar de Albuquerque ◽  
Fernando Soares Lameiras ◽  
Plínio Eduardo Praes ◽  
Antônio Eduardo Clark Peres
Keyword(s):  
High Surface ◽  
Mining Industry ◽  
Mineral Resources ◽  
Ionic Species ◽  
Separation Processes ◽  
Phosphate Ore ◽  
Superficial Similarity ◽  
Low Efficiency ◽  
Silicate Carbonate ◽  
High Surface Activity

A high demand for mineral resources observed in recent decades has led to an expansion in production in the mining industry. Different process alternatives have been proposed for selective separation between apatite and contaminants (carbonates and silicates) present in phosphate ores. Magnetic separation, calcination and gravity separation processes are methods that present low efficiency and high cost. Flotation is the most common process; however the selectivity is hampered by the superficial similarity of the chemical composition of phosphates and carbonates, high surface activity of the collectors used, interactions between dissolved ionic species of certain mineral with another and also interactions between dissolved ionic species and reagents. In this study, conducted in a laboratory scale, eight different depressants, organic and inorganic, were tested in the direct flotation of a Brazilian silicate-carbonate phosphate ore. The best performance in the depression of calcite and silicates was achieved with cassava starch.

scholarly journals Optimal Depressants and Collector Dosage in Fluorite Flotation Process Based on DoE Methodology

2019 ◽  
Vol 9 (3) ◽  
pp. 366 ◽  
Author(s):  
J.R. Corpas-Martínez ◽  
A. Pérez ◽  
C. Amor-Castillo ◽  
R. Navarro-Domínguez ◽  
M.A. Martín-Lara ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Oleic Acid ◽  
Potato Starch ◽  
Ionic Species ◽  
Statistical Technique ◽  
Separation Processes ◽  
Flotation Process ◽  
Low Efficiency ◽  
Composition Of Minerals ◽  
Alternative Processes

Alternative processes have been proposed for selective separation of fluorite and gangue minerals (carbonates and silicates) present in fluorspar ores. Calcination and gravity separation processes are methods that have low efficiency and high cost. Flotation is a chemical process that becomes important when high ore grades are required; however, the selectivity is inhibited by the superficial similarity of the chemical composition of minerals. Accordingly, interactions between dissolved ionic species of fluorite, carbonates, and silicates with some reagents under determinate conditions obstruct the flotation process. In order to optimize the flotation process of a Spanish fluorite ore, this research uses a mathematical model. In this study, the variables were the dose of potato starch, quebracho tree, white dextrine, oleic acid, and sodium silicate. On the other hand, the factors studied were the law of carbonates, silica, and fluorite, in addition to the metallurgical recovery of fluorite. The statistical technique of factor analysis that relates the variables and factors allowed to the optimization of the reagent dosage. Maximum metallurgical recovery was achieved without sacrificing the fluorite grade. The mathematical model adjusts satisfactorily to the results with a correlation coefficient of 91.58% for metallurgical recovery and 98.51% for fluorite grade. Optimizing the process 60.45% of metallurgical recovery and 68.99% of fluorite grade are achieve in the roughing step, using a dosage of 1.68 g·kg−1 of potato starch, 0.86 g·kg−1 of quebracho tree, 1.25 g·kg−1 of dextrin, 3 g·kg−1 of oleic acid, and 0.85 g·kg−1 of water glass.

scholarly journals RESEARCH OF EFFICIENCY OF NANOSIZED POWDERED ICE-FORMING REAGENTS

2020 ◽  
pp. 31-40
Author(s):  
N.S. Kim ◽  
V.P. Korneev ◽  
A.M. Petrunin ◽  
A.V. Chastuhin ◽  
E.F. Voronin
Keyword(s):  
High Activity ◽  
Silver Iodide ◽  
High Surface ◽  
High Mountain ◽  
Laboratory Studies ◽  
Geophysical Institute ◽  
Low Efficiency ◽  
Nanosilica Particles ◽  
Central Aerological Observatory ◽  
High Surface Activity

The article discusses nanosized powdery ice-forming reagents, which are supposed to be used in the works on active action on clouds in order to regulate precipitation and hail suppression, as well as to dissipate supercooled fog. These ice-forming reagents have been obtained by the levilite method, in which a layer of silver iodide is deposited on the surface of nanosilica particles. Description of the methodology for studying the effectiveness of nanosized powdery ice-forming reagents, as well as the results of laboratory studies of their effectiveness obtained in different organizations is given. The results of studies of ice-forming reagents carried out at laboratories of RPA “Typhoon”, High-Mountain Geophysical Institute, JSC “Cheboksary production association n.a. V.I. Chapaev” and ANO “Agency of atmospheric technologies” have shown that the efficiency of these reagents differs significantly from those obtained earlier in the Central Aerological Observatory. It has been suggested that the low efficiency of nanosized ice-forming reagents is due to the high aggregation of the original nanosilicum particles, resulting from the high surface activity of these particles. Possible ways to reduce the degree of aggregation of powders by modifying the surface of the original nanoparticles aimed at decreasing the high activity of the nanosilica particles surface are discussed.

A Study on Ivory Coast with the Impacts of Artisanal Gold Mining on Local Livelihoods and the Mining Industry

2017 ◽  
Vol 20 ◽  
pp. 68-77
Author(s):  
Kouame Joseph Arthur Kouame ◽  
Fu Xing Jiang ◽  
Yu Feng ◽  
Si Tao Zhu
Keyword(s):  
Ivory Coast ◽  
Gold Mining ◽  
Mining Industry ◽  
Mineral Resources ◽  
Barriers To Entry ◽  
Chemical Contaminants ◽  
Artisanal Mining ◽  
Local Livelihoods ◽  
Artisanal Gold Mining ◽  
Main Activity

In rural regions, mining is an activity that employs many people due to the fact that the barriers to entry are sometime trivial, with very low technology, capital fund and no specialized skills required. Many people including children into artisanal mining in Ivory Coast because they can earn higher incomes in mining than through other traditional activities such as agriculture, which is the main activity in the country. Artisanal mining contribute to reduce the abject poverty and it offers many others opportunities. However, this activity has many negative social impacts. Local people including miners are risking their life everyday due to the unsanitary conditions, prostitution, chemical contaminants, and alcoholism, and also the large degradation of lands. The main objective of this Paper is to understand how artisanal gold mining in the Ivory Coast affects local livelihoods and the environment. Some key recommendations for addressing artisanal mining activities in order to have a good option for sustainable management of mineral resources in the country are proposed.

Production and Properties of Biosurfactants from a Newly Isolated Pseudomonas fluorescens HW-6 Growing on Hexadecane

2006 ◽  
Vol 61 (7-8) ◽  
pp. 553-559 ◽  
Author(s):  
Evgenia Vasileva-Tonkova ◽  
Danka Galabova ◽  
Emilia Stoimenova ◽  
Zdravko Lalchev
Keyword(s):  
Pseudomonas Fluorescens ◽  
Industrial Wastewater ◽  
High Surface ◽  
Emulsifying Properties ◽  
Effective Surface ◽  
Mineral Oils ◽  
Air Water Interface ◽  
Polluted Sites ◽  
High Concentrations ◽  
High Surface Activity

The newly isolated from industrial wastewater Pseudomonas fluorescens strain HW-6 produced glycolipid biosurfactants at high concentrations (1.4-2.0 g l-1) when grown on hexadecane as a sole carbon source. Biosurfactants decreased the surface tension of the air/ water interface by 35 mN m-1 and possessed a low critical micelle concentration value of 20 mg l-1, which indicated high surface activity. They efficiently emulsified aromatic hydrocarbons, kerosene, n-paraffins and mineral oils. Biosurfactant production contributed to a significant increase in cell hydrophobicity correlated with an increased growth of the strain on hexadecane. The results suggested that the newly isolated strain of Ps. fluorescens and produced glycolipid biosurfactants with effective surface and emulsifying properties are very promising and could find application for bioremediation of hydrocarbon-polluted sites.

Best Available Techniques in mining industry: topical issues and solution methods

2020 ◽  
pp. 55-64
Author(s):  
A. E. Zakondyrin
Keyword(s):  
Mining Industry ◽  
Mineral Resources ◽  
Economic Activities ◽  
Extractive Industry ◽  
Best Available Techniques ◽  
Ecological Changes ◽  
Solution Methods ◽  
Frame Work ◽  
The Russian Federation ◽  
Negative Environmental Impact

Extraction of mineral resources is one of the most profitable economic activities of the country, commanding a large part in Russian GDP. Nevertheless, precisely extractive industry is simultaneously leading in the level of Negative Environmental Impact. Adoption and application of BAT in mining sector companies requires essential changes in ecological policy of the Russian Federation. Although they were already started since 2014, there are still many unsolved problems in this area. It is emphasized within the article frame work, that one of the most topical issues is a long-standing need to develop more efficient methods and mechanisms of state support for technological and ecological changes. The ways of difficulties overcoming were considered, recommendations on enhancement of existing regulatory framework and standardisation documents in the area of research were made.

scholarly journals PROBLEMS OF EXPORT-IMPORT OPERATIONS ACCOUNTING IN UKRAINE'S EXTRACTION FIELD

2018 ◽  
pp. 57
Author(s):  
V. Volkov ◽  
L. Horoshkova
Keyword(s):  
Systematic Approach ◽  
Mining Industry ◽  
Mineral Resources ◽  
World Market ◽  
Natural Sand ◽  
Internal Markets ◽  
Extraction Field ◽  
Market Situation ◽  
Analysis Of Dynamics ◽  
Study Process

The article develops a systematic approach to the management of mining, using, export and import non-metallic minerals for construction considering the economic parameters of the development of the world market situation and the domestic market. The analysis showed that the classification of minerals used by the Public Service Geology and Mineral Resources of Ukraine, the State Statistics Committee of Ukraine and Statistics of foreign economic activity - codes UKTZED - do not coincide that complicates the study process using these official sources. According to the results of the conducted researches, the indicators of the dynamics of minerals production in their natural and costly dimensions have been found to be inadequate. An analysis of dynamics and geographic structure of export-import operations was also conducted with natural sand, pebbles, gravel and breakstone. The obtained results allowed us to conclude that the approach to formation of export minerals' flows is not rational, because it poses a threat to the financial state of the mining industry and the country. An analysis of the geographical structure of the export and import of natural sand, pebbles, gravel and breakstone allowed proposing the use of a systematic approach to rational extraction, the use of the country's mineral resources base, while taking into account export-import flows and the price conditions of the external and internal markets and taking into account the resource component of state security.

scholarly journals PAYING THE PIPER (IN PRAESENTIA) Xstrata South Africa (Pty) v SFF Association 2012 (5) SA 60 (SCA)

Obiter ◽  
2021 ◽  
Vol 34 (2) ◽  
Author(s):  
PJ Badenhorst
Keyword(s):  
Mining Industry ◽  
Mineral Resources ◽  
The State ◽  
Mining Operations ◽  
South Africans ◽  
Old Order ◽  
Petroleum Resources ◽  
Mineral Rights ◽  
The Right ◽  
Mining Right

This decision is an appeal from the decision of the South Gauteng High Court in SFF Association v Xstrata (2011 JDR 0407 (GSJ)). The court a quo decided incorrectly that the holder of an old-order mining right, which was converted into a (new) mining right in terms of the Mineral and Petroleum Resources Development Act 28 of 2002 (the “Act”), remains liable upon conversion for the payment of (contractual) royalties in terms of a mineral lease, which was concluded prior to enactment of the Act. The appeal was upheld by the Supreme Court of Appeal (“SCA”) (2012 (5) SA 60 (SCA) par 27). The decision was rendered by Wallis JA with the other judges concurring with his judgment. Prior to the Act mineral-right holders could grant a mining right to a miner against payment of royalties or other forms of consideration. At issue on appeal was whether the obligation to pay royalties in terms of a mineral lease “survives the introduction of the new regime in respect of mining rights brought about by the Act”. As indicated by the SCA, the Act fundamentally changed the legal basis upon which rights to minerals are acquired and exercised. Previously mineral rights were vested in the owner of land or the holder of mineral rights, which rights could be exercised upon acquisition of a statutory authorization to exploit the minerals. In terms of the new regime, common-law mineral rights were destroyed and “all mineral resources vested in the state as the custodian of such resources on behalf of all South Africans”, whereupon the state could confer the right to exploit such resources to applicants. Upon granting a mining right in terms of the Act (statutory) royalties have become payable to the state since 1 March 2010 of the Act and the Mineral and Petroleum Resources Royalty Act 28 of 2008. In order to prevent disruption of the mining industry, provision was made in the Act for the continuation of old-order rights for different transitional periods ranging from one to five years and conversion of such rights during the periods of transition. The transitional arrangements in Schedule II of the Act (“transitional arrangements”) inter alia ensured security of tenure of prospecting rights and mining rights and enabled holders thereof to comply with the Act. In particular, an old-order mining right remained valid for five years “subject to the terms and conditions under which it was granted” (item 7(1) of the transitional arrangements) and could be converted into a new mining right (item 7(2) of the transitional arrangements) if certain requirements were met. The applicant had to have: (a) met the requirements for lodgement of application for conversion; (b) conducted mining operations in respect of the mining right; (c) indicated that he would continue to conduct such mining operations upon conversion of the mining right; (d) had an approved environmental management programme; and (e) paid the prescribed conversion fee (item 7(3) of the transitional arrangements). To recap, the Xstrata decision dealt with an old-order mining right that had been converted into a (new) mining right and the effect of these statutory changes on rights to royalties which accrued to a former holder of mineral rights by virtue of a mineral lease. 

scholarly journals INNOVATIVE PROCESSES OF DEEP AND ENVIRONMENTALLY SAFE PROCESSING OF TECHNOGENIC RAW MATERIALS IN THE CONDITIONS OF NEW ECONOMIC CHALLENGES

2021 ◽  
Vol 13 (2) ◽  
pp. 224-237
Author(s):  
Valentin CHANTURIA ◽  
◽  
Irina SHADRUNOVA ◽  
Olga GORLOVA ◽  
◽  
...  
Keyword(s):  
Raw Materials ◽  
Mining Industry ◽  
Mineral Resources ◽  
Secondary Products ◽  
Resource Saving ◽  
Mineral Raw Materials ◽  
The Face ◽  
Environmentally Safe ◽  
Copper Zinc ◽  
Technogenic Raw Materials

Innovative processes of deep and complex processing of technogenic raw materials in the context of sustainable development of the mining industry and the economic challenges facing the mining industry should ensure the transition to a circular economy and the maximum use of natural resources. The article reflects the priority scientific and technological research on the involvement of technogenic mineral resources in efficient processing. Presented, developed at ICEMR RAS, including jointly with universities, research and production organizations and enterprises, modern innovative processes of deep and environmentally friendly processing of refractory mineral raw materials of complex material composition (tailings of enrichment of non-ferrous and noble metal ores, poor off-balance ores, slags ferrous and nonferrous metallurgy, sludge of metallurgical production) and hydro-mineral technogenic resources (acidic mineralized bottom-dump waters of mining enterprises of the copper-zinc complex of the Urals, saponite-containing circulating waters of diamond processing factories). Among other things, new directions in the field of selective disintegration of finely dispersed mineral raw materials based on energy effects and deep processing of slags are outlined; increasing the selectivity of enrichment processes; combined processing of technogenic raw materials; resource-saving processing of technogenic and hydro-mineral resources, obtaining secondary products from processing waste. It is shown that in the face of new economic challenges, Russia has sufficient scientific and technological potential in the field of deep and environmentally safe processing of technogenic raw materials in the form of developed and, to varying degrees, tested innovative resource-saving technologies that correspond to the world level, and in a number of technologies are superior to it.

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