scholarly journals Talvivaara Sotkamo Mine – Bioleaching of a polymetallic nickel ore in subarctic climate

2021 ◽  
Vol 10 (1) ◽  
pp. 7-14
Author(s):  
Marja Riekkola-Vanhanen

The main activity of the Talvivaara Mining Company Plc. is the development and exploitation ofthe Talvivaara deposits in Sotkamo, Finland using bioheapleaching. The Talvivaara deposits comprise one of the largest known sulphide nickel resources in Europe with 1004 million tonnes of ore, sufficient to support anticipated production for a minimum of 45 years. The mine started in late 2008 and will have an annual nickel output of approximately 50,000 tons when it reaches full production. In addition, the mine will also produce zinc (approximately 90,000 tpa), copper (approximately 15,000 tpa) and cobalt (approximately 1,800 tpa) as by-products of the process. The viability of bioheapleaching technology for the extraction of nickel has been demonstrated in a large on-site pilot trial using Talvivaara ore. The three year pilot has shown that the leaching process also works well in the subarctic climatic conditions of Eastern Finland.

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3131 ◽  
Author(s):  
Yasir Rashid ◽  
Fadi Alnaimat ◽  
Bobby Mathew

In this article, thermal performance of different waste materials and by-products of industrial processes is investigated experimentally. A geopolymer concrete block with 7.5 cm thickness and cross-sectional area of 5 × 5 cm was considered as a reference model to measure heat transmission across the two opposite surfaces while all four remnant surfaces were perfectly insulated. For all other samples, a sandwich concrete block was developed by taking two pieces of the geopolymer concrete with 2.5 cm thickness each on either side and insulation material of 2.5 cm thickness in between. The sandwich materials investigated were air cavity, expanded polystyrene foam, polyurethane foam, rubber tire, date palm, PCM-30, and PCM-42. Experimental investigations revealed that the investigated green materials and industrial by-products have comparable insulation performance with respect to the traditional insulations such as expanded polystyrene foam. It is found that polyurethane foam and date palm can reduce indoor cooling demand by 46.6% each in hot conditions while rubber tire can reduce indoor heating demand by 59.2% in cold climatic conditions at the maximum. The research results confirm and encourage the effective utilization of waste materials in building walls for reducing indoor air-conditioning demand in the extreme climatic conditions.


2012 ◽  
Vol 524-527 ◽  
pp. 906-909
Author(s):  
Shao Cheng Ge ◽  
Tong Yang ◽  
De Ji Jing

It concerns about issues of dust pollution of three feeder which in the underground passage under the storage warehouse of Inner Mongolia Datang International Xilinhaotes Mining Company Limited.By inspections and investigations in the field,according to site-specific circumstances and local climatic conditions,we had implemented comprehensive renovation project of coal dust of feeder in underground passage,and achieved remarkable and effective governance results.


2020 ◽  
Author(s):  
Юлиана Русу ◽  
◽  
Тудор Настас ◽  
Виктор Горбан ◽  
Василиса Одобеску ◽  
...  

Three main activity periods of the A. segetum population corresponding to the three-generation development of the pest in the climatic conditions of the Republic of Moldova using pheromone traps. The method of mass capture of males of A. Segetum has been determined to be highly biologically effective in the case of soy.


2020 ◽  
Vol 11 (4) ◽  
Author(s):  
G. M. Maruschak ◽  
◽  
M. M. Lisovoy ◽  

Emphasis is placed on the efficiency of production of alternative types of biofuels by rational selection of species and the intensity of biomass formation of plants of the appropriate chemical composition. It is determined that favorable natural and climatic conditions of the South of Ukraine, the presence of built rice irrigation systems make it possible to obtain high yields of high quality rice grain, while forming significant amounts of by-products in the form of straw, husk, flour, which are a source of solid biofuel.As a result of research of bioenergetic potential of Ukrainian rice varieties it is shown that the highest values of energy yield under the use of by-products (straw and husk) are characterized by Viscount and Premium varieties, which studied to determine the impact of agronomic factors on the formation of rice productivity. straw and husks as sources of bioenergy plant raw materials as solid biofuels.


2016 ◽  
Vol 870 ◽  
pp. 568-572
Author(s):  
V.V. Krymsky ◽  
E.V. Litvinova ◽  
J.G. Mingazheva

Experimental results for nanosecond electromagnetic impulses (NEMI) impact on precious metals leaching process from sulphidic ores are presented. A possibility of an intensification of leaching process of Au, Ag, Cu is established. The extraction of silver increases by 70 %, gold – by 40 %. The samples of sulphidic ores from the pit of JSC NPF "Bashkir gold mining company" are taken as objects of research. The use of economic electronic generators is suggested herein. They create impulses of 1 nanosecond, the front of 0.1 nanoseconds, amplitude of 6-15 kV impulses, 1 kHz frequency of repetition, consumed power from an electric network is less than 100 W. Energy in one impulse is 10–3 J. The pulse field changes the valence of metals of impurity towards decrease. It changes the current of chemical reactions in a mineral matrix. The local heating of the precious metals interspersed particles and destruction of a mineral matrix are also possible.


Plants ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 2738
Author(s):  
Ioannis Manthos ◽  
Dimos Rouskas

Ιn an effort to create walnut cultivars (Juglans regia) with high productivity, fruit quality and lateral bearing, a new cultivar, named “Leto”, was created by the cross “Gustine” × “Pedro”. Its main phenological and pomological characteristics were assessed according to the criteria of IPGR (1994) and UPOV-TG/125/6 (1999), for 10 consecutive years and compared with its maternal cultivars and “Chandler”. Observations showed that “Leto” has high lateral bearing habit (90%) and presents satisfactory yield at the full production age. The tree size is smaller than that of its parents and “Chandler”, female flowers bloom from 11 to 22 of April and male from 3 to 6 of April. “Leto” nuts are harvested at the end of September, present easy hull dehiscence and high kernel percentage. Other positive nut characteristics of “Leto” are light kernel color, well kernel filling and easy removal of the kernel halves. “Leto” is a mid-early cultivar of great interest due to its high- quality nuts, suitable for dense plantings, in regions where the last spring frosts occur in late March to early April, thus, making it a promising cultivar for Greece, but also for other regions with similar geomorphological and climatic conditions.


2021 ◽  
Vol IV (2) ◽  
pp. 117-127
Author(s):  
Grigore Musteață ◽  
◽  
Anatol Balanuță ◽  
Vladislav Reșitca ◽  
Razvan Vasile Filimon ◽  
...  

One of the economy key sectors of Republic of Moldova and Romania is the wine sector, where a progressive trend has prevailed in recent years. But to increase its efficiency it is necessary to use the raw material in a complex way, producing both famous wines and other necessary products, as well as to comply with the rigors of ecological standards. The issue of wine by-products draws the attention and interest of researchers, regulators, industry and consumers and has urged the European Community to a zero waste economy by 2025. The article deals with the chemical composition of the main parts of grapes which depend on a number of factors, such as variety, climatic conditions of the year, vine and wine making practices, condition of the grapes, their maturity, etc. There have been presented physico-chemical characteristics of the wastes obtained from the grapes processing such as: bunches, grape pomaces, piquette and diffusion juice, seeds, wine yeast, tirighia and vinasse. Thus, by making use of wine wastes, a number of valuable products can be obtained that can be used for different purposes.


2020 ◽  
Vol 35 (1) ◽  
Author(s):  
Pablo Jaramillo

The Colombian government and large-scale mining companies accuse small-scale gold miners of lacking a sense of the future, thereby harming the future of Colombia. In this article, I argue that marginalized people who extract gold with small-scale techniques create an alternative sense of future by engaging with the leftovers of their gold mining practices. This article is based on ethnographic fieldwork with people who struggle to make a living in the wake of large-scale mining interventions in the town of Marmato. Small-scale mining constantly creates simple by-products—gases, rubble, and mud—that look like waste. Small-scale miners engage with such substances as a way to make sense of their lives and the future. Making the relationships between humans and geological substances, waste and technology visible elucidates alternative forms of life that “get in the way” of a multinational mining company, the national government, local mafias, and financial markets hungry for gold in times of crisis. By analyzing people’s engagement with leftovers, I offer an understanding of resilience and survival in the margins of capitalist cycles of violence. Resumen El gobierno de Colombia y las compañías mineras a gran escala ven la minería a pequeña escala como una práctica sin futuro y dañina para el país. En este artículo argumento que las personas marginalizadas que extraen oro a pequeña escala crean sentidos de futuro alternativos al entrar en relación con las sobras de sus propias prácticas mineras. El artículo está basado en trabajo de campo etnográfico en el pueblo de Marmato, con personas que luchan por sobrevivir ante la inminencia de la ejecución de un proyecto de minería a gran escala en la montaña donde se localiza el pueblo. La minería a pequeña escala crea subproductos de manera permanente—colas, sobrantes y restos—que parecen basura. No obstante, los mineros a pequeña escala se involucran con estas sustancias como una forma de hacer sentido sobre sus propias vidas y futuros. Hacer visible la relación entre humanos y sustancias geológicas, desechos y tecnología hace posible apreciar formas alternativas de vida que “se ponen en el camino” de una multinacional minera, el gobierno nacional, mafias locales y los mercados financieros que buscan oro en tiempos de crisis. Al analizar la relación de las personas con gases, escombros, rocas, y barro, aporto una posibilidad de entender la resiliencia y subsistencia en los márgenes del capitalismo y sus ciclos de violencia.


2021 ◽  
Vol 03 (01) ◽  
pp. 154-161
Author(s):  
Muzaffar Abdumalik Ugli Karimov ◽  

Increasing global problems affects negatively to the economies of countries. In this situation, the effective use of natural conditions in the country requires work to increase the range of food products, work to increase their production capacity. It is important to achieve high economic efficiency by improving the organizational and economic mechanisms of food industry enterprises. The food industry is one of the developing industries in our country. It is important to ensure the competitiveness of the industry, increase the share of exports, and organize the production of by-products instead of imported ones. It is crucial to use effectively high-yielding intensive technologies in the natural and climatic conditions of Uzbekistan.


Author(s):  
Valentina Constanta Tudor

The cultivation of vegetables and fruit trees was the main activity of the Romanian farms, a country badly affected both by the process of nationalization / collectivization during the communist period and by the defective retrocession of the post-communist period. But since 2007, investments in agriculture, including those in the fruit and vegetables sector, have played an essential role, both by setting up new agricultural holdings and by upgrading the existing ones. During the programming period 2007-2013 and 2014-2020, farmers could access measures that can be plunged into the fruit and vegetable sector. Starting from the main advantages of the fruit and vegetables sector, such as the large assortment of fruit and vegetable species and varieties, the large number of farms, the pedo-climatic conditions favorable to the cultivation of a significant number of varieties, the growing of the areas cultivated with vegetables in protected areas Modernization of the processing units, improving the fruit and vegetable harvesting activity play a particularly important role in the revitalization of this sector. The market for vegetables and fruits is influenced by a number of factors such as: the demand and supply atomicity, product homogeneity, the seasonality of vegetable and fruit products, the high degree of perishability, the demand for vegetables and fruits has a continuous character, the production of vegetables and fruits has different destinations. Modern analysis of the global value chain focuses on actors’ relationships as a way to reduce uncertainty, improve access to key resources and increase chain efficiency. For the proper functioning of the vegetable and fruit chain, the producer groups and producer organizations are extremely important.


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