Time filter

Source Type

Szymkiewicz A.,Grupa Tauron | Hycnar J.J.,Ecocoal CC | Fras A.,PKW SA | Przystas R.,PKW SA | And 2 more authors.
Inzynieria Mineralna | Year: 2012

In coal-mining industry a major environmental and economical problem are mining wastes. Particularly troublesome, due to their consistency, are the coal slimes. In this form they are difficult to be managed, as well as to be safely stored. More often coal slimes are granulated using quicklime or hydrated lime. The studies and tests conducted on industrial installations have shown that the traditional lime binders can be replaced by combustion by-products containing active compounds of calcium. Application of fluidized bed combustion ash (FBC ash) allows receiving granulated slimes of physicochemical properties that meet the requirements of lowcalorific fuels, as well as a component of fuel blends. The granulated slimes with grinded bottom ash from fluidized bed boilers (FCB bottom ash) have shown the highest mechanical resistance to the weather conditions, transport and storage. Through the selection of medium-grained waste produced in settling lagoons and appropriate mixing with selected calcium ashes (FBC fly ash and FBC bottom ash) the aggregate-binder blends have been obtained that meet the requirements applicable to materials used in construction of roads, highways and hydrotechnical engineering. The implementation and investments made allowed for the management of waste to produce granulated fuels and aggregate-binder blends, what resulted in reducing the amount of stored mining waste and ash, as well as in obtaining the additional environmental and economic benefits. Source

Baic I.,Centrum Gospodarki Odpadami i Zarzadzania Srodowiskowego | Blaschke W.,Centrum Gospodarki Odpadami i Zarzadzania Srodowiskowego | Goralczyk S.,Centrum Gospodarki Odpadami i Zarzadzania Srodowiskowego | Szafarczyk J.,Centrum Gospodarki Odpadami i Zarzadzania Srodowiskowego | Buchalik G.,Warkop Sp. z o.o.
Rocznik Ochrona Srodowiska | Year: 2015

In recent years the philosophy of energy coal output enrichment has changed. It was noted that due to the already owned coal combustion installations the very clean coal concentrates are not being searched on the market. The studies have shown that even partial removal of gangue particles from the raw coal allows to obtain commercial products corresponding to the parameters of the warranty boilers in power plants, coal handling plants and heating plants. The separation of stone particles from the coal particles is called the deshaling process The existing methods for enrichment of the raw coal is carried out by using wet methods. The enrichment involves using heavy media, jig and flotation. The wet methods make the tiniest grain of excavated material to go to the node of the water - mud processing plant. Their management is expensive and sometimes very difficult technically. The wet methods of enrichment may be, in many cases replaced by the dry methods. In such case occurs the enrichment on air concentration tables with new construction. These tables have already been widely used in many countries. This is a Chinese design commonly tested - there are more than 1800 such installations already working. This paper describes the working principle of the air concentration table, its construction, factors influencing the process of separation of stone from coal. It also presents the benefits of technological, economic and environmental implementation of the dry separation method. © 2015, Middle Pomeranian Scientific Society. All rights reserved. Source

Blaschke W.,Centrum Gospodarki Odpadami i Zarzadzania Srodowiskowego | Witkowska-Kita B.,Centrum Gospodarki Odpadami i Zarzadzania Srodowiskowego | Biel K.,Centrum Gospodarki Odpadami i Zarzadzania Srodowiskowego
Rocznik Ochrona Srodowiska | Year: 2015

In 2008 Committee on Critical Mineral Impacts of the U.S. Economy, presented a definition of critical raw materials, which was also adopted by the countries of the European Union. According to this definition the critical raw materials are “minerals / materials exposed to the risk of disrupting or interruption of the supply, for which this deficit can have serious economic consequences for the entire economy”. The most critical to the economy of the European Union were considered 14 raw materials of significant economic importance, (i.e.: antimony, beryllium, cobalt, fluorspar, gallium, germanium, graphite, indium, magnesium metal, niobium, platinum group metals, rare earths, tantalum and tungsten) characterized primarily by a high risk of shortage or lack of supply, which result from a limited number of sources of their acquisition. Most materials belonging to this group are essential for the development of new technologies. The above list of 14 critical raw materials is a proposal that can be modified as a result of the reduction of critical raw materials resources in European countries. As a result of the literature analysis of identified technology it was found that the most recognizable way to enrich the individual raw materials is processing their ores, which are the carriers of many metals. The ore is processed in order to improve the chemical composition, standardization of the ore in terms of chemical and physico-chemical properties, providing adequate size pieces of the ore. Since the mined ore is usually not suitable for direct processing, multistage process of the ore enrichment is important. The enrichment of metal ores can be divided into: mechanical and chemical enrichment. The process of ore processing was applied to the following materials: beryllium, cobalt, tungsten and fluorite. A comprehensive assessment of mineral potential of the European Union countries and the identification of the so-called critical raw materials necessary for its harmonious and sustainable economic development and technological progress, is one of the priorities of the EU's raw materials policy. © 2015, Middle Pomeranian Scientific Society. All Rights Reserved. Source

Discover hidden collaborations