7 research outputs found

    Evaluating the possibilities of obtaining initial concentrates of rare earth elements (REEs) from fly ashes

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    The article presents the results of initial laboratory research into the possibilities of obtaining REE from fly ash from one of Polish powerhouses. In the work the authors have presented the results of investigations into the obtaining of initial REEs concentrations from fly ashes by physicochemical and hydrometallurgical methods. These investigations provide a basis for developing a technology of RRE recovery from fly ashes produced in the process of hard coals combustion

    Influence of selected organic compounds on the parameters of mixtures injected into goaf caving equipment

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    W artykule przedstawiono wyniki bada艅 laboratoryjnych, kt贸rych g艂贸wnym celem by艂o uzyskanie danych zwi膮zanych z mo偶liwo艣ci膮 wykorzystania plastyfikator贸w do betonu jako dodatk贸w poprawiaj膮cych w艂a艣ciwo艣ci reologiczne mieszanin zat艂aczanych do zrob贸w zawa艂owych. Przebadany zosta艂 wp艂yw wybranych zwi膮zk贸w chemicznych na w艂a艣ciwo艣ci mieszanin popio艂owo-wodnych oraz mieszanin na bazie py艂u cementowego i wody. Wykonane badania materia艂贸w odpadowych pos艂u偶y艂y do okre艣lenia kryteri贸w doboru materia艂贸w pod k膮tem ich uziarnienia, poprawy zdolno艣ci do zwi臋kszenia penetracji w rumoszu zawa艂owym oraz stopnia wype艂nienia i doszczelnienia zrob贸w zawa艂owych.This paper presents the results of laboratory tests whose main purpose was to obtain data referring to the potential use of concrete plasticizers as additives improving the rheological properties of mixtures injected into goaf caving. The influence of the selected compounds on the properties of ash and water mixtures and mixtures based on cement dust and water was tested. The tests of waste materials were used to define the criteria for the selection of materials considering their granulation, improvement of the ability to increase penetration in the rubble rocks and the degree of filling and sealing the abandoned workings caving

    Kinetic model of carbon dioxide sequestration in aqueous solutions of selected industrial waste

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    Wi膮zanie CO2 w zawiesinach odpadowo-wodnych przez mineraln膮 karbonatyzacj臋 jest jedn膮 z metod ograniczania emisji dwutlenku w臋gla. Mineralna karbonatyzacja (mineralna sekwestracja) CO2 w zawiesinach popio艂owo-wodnych jest procesem z艂o偶onym. Na podstawie bada艅 poch艂aniania CO2 przez zawiesiny wodne popio艂贸w fluidalnych z Elektrociep艂owni Tychy SA opracowano model kinetyczny sekwestracji dwutlenku w臋gla. Model ten, opisuj膮cy kinetyk臋 sekwestracji CO2, jest pr贸b膮 okre艣lenia szybko艣ci reakcji zachodz膮cych w poszczeg贸lnych etapach sekwestracji dwutlenku w臋gla, prowadz膮cych do jego trwa艂ego zwi膮zania i utworzenia stabilnych, w za艂o偶onych warunkach, produkt贸w. Sk艂ad fazowy zawiesin popio艂owo-wodnych, ich wsp贸艂zale偶no艣膰 w stanach r贸wnowagowych przy wprowadzaniu CO2 pozwala na postawienie tezy, 偶e wyniki bada艅 popio艂贸w lotnych z Elektrociep艂owni Tychy SA b臋dzie mo偶na odnie艣膰 do innych odpad贸w przemys艂owych (popio艂贸w lotnych, odpad贸w z suchego i p贸艂suchego odsiarczania spalin, 偶u偶li hutniczych, py艂贸w z instalacji piec贸w cementowych), w kt贸rych wyst臋puj膮 takie same lub podobne sk艂ady fazowe.Binding of CO2 by mineral carbonation in aqueous waste suspensions is a method of reducing the emissions of carbon dioxide. Mineral carbonation (mineral sequestration) of CO2 in aqueous ash suspensions is a complex process. Research on CO2 absorption in aqueous suspensions of fluidized ashes from a heat and power plant in Tychy served as a base to prepare a kinetic model of carbon dioxide sequestration. The model, which shows the kinetics of CO2 sequestration, is an attempt at determining the speed of reactions taking place at each stage of carbon dioxide sequestration, leading towards its permanent binding and the creation of products which are stable in the assumed conditions. The phase composition of aqueous ash solutions and their interdependence on each other in equilibrium conditions on introducing CO2 makes it possible to argue that the results of research on fly ashes in the Tychy power plant may be transferred to other industrial waste (fly ashes, waste from dry and semi-dry desulphurization of flue gases, steel slag, cement kilns dusts), where the same or similar phase compositions appear

    Possibilities of management of selected wastes from the processes of clean coal technologies

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    Procesy czystych technologii w臋glowych w zdecydowanej wi臋kszo艣ci wi膮偶膮 si臋 z produkcj膮 odpad贸w, kt贸re nale偶y zagospodarowa膰 lub zutylizowa膰. Technologiczny post臋p i rozw贸j proces贸w CTW sprawia, 偶e przedmiotowe odpady zaczynaj膮 by膰 traktowane jak produkty. Prezentowany artyku艂 ma charakter przegl膮dowy i dotyczy sposob贸w zagospodarowania wybranych i najcz臋艣ciej powstaj膮cych odpad贸w podczas proces贸w nale偶膮cych do tzw. czystych technologii w臋glowych. Scharakteryzowano najwa偶niejsze produkty odpadowe w postaci sta艂ej, ciek艂ej i gazowej, powstaj膮ce w CTW. Sposoby i kierunki post臋powania z nimi zosta艂y przedstawione tabelarycznie. Zwr贸cono uwag臋 na perspektywiczne kierunki unieszkodliwiania, zw艂aszcza 艣ciek贸w powstaj膮cych podczas podziemnego zgazowania w臋gla.Processes of clean coal technologies are in most cases related to the production of waste to be disposed of or managed. Technological progress and the development of CCT processes make the waste begin to be treated as products. The present article has a review character and concerns the ways of managing selected and the most emerging wastes during the processes of the so-called clean coal technologies. The work characterizes the most important wastes and products in solid, liquid and gas states created by CCT. Ways and directions of managing the waste and products were presented in a tabular form. The prospective directions of neutralizing, the sewage waste arising during underground coal gasification in particular, have been emphasized

    Modeling kinetics of CO2 (carbon dioxide) mineral sequestration in heterogeneous aqueous suspensions systems of cement dust

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    The necessity to reduce CO2 emission in the environment has encouraged people to search for solutions for its safe capture and storage. Known methods for carbon dioxide mineral sequestration are based primarily on the use of its binding reaction with metal oxides, mainly earth metals. Increasingly important, due to the availability and price, are processes based on the suspension of various wastes such as fly ash, cement dust or furnace slag. Due to the complexity of the mineral sequestration of CO2 in water-waste suspensions, an important issue is to determine the reaction mechanisms. This applies mainly to the initial period of the transformation phase of mineral wastes, and consequently with the occurrence of a number of transition states of ionic equilibria. The mechanisms and reaction rates in the various stages of the process of CO2 mineral sequestration in heterogeneous systems containing selected wastes are defined herein. This paper presents a method of modeling kinetics of this type of process, developed on the basis of the results of the absorption of CO2 thanks to the aqueous suspension of fly ash and cement dust. This allowed for the transfer of obtained experimental results into the mathematical formula, using the invariant function method, used to describe the processes

    Tests and evaluation of effectiveness of mixtures mitigating mercury vapour emission from mine waste dumps

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    W artykule przedstawiono wyniki bada艅 laboratoryjnych i terenowych, kt贸rych g艂贸wnym celem by艂o opracowanie sk艂adu mieszanin ograniczaj膮cych procesy uwalniania si臋 rt臋ci do 艣rodowiska naturalnego z ha艂d odpad贸w pow臋glowych oraz opracowanie metodyki jej trwa艂ego wi膮zania (absorpcji). W prowadzonych pracach wykorzystano materia艂y odpadowe z energetyki, g贸rnictwa w臋gla kamiennego i g贸rnictwa gazu ziemnego. Opracowane mieszaniny do redukcji emisji par rt臋ci poddane zosta艂y badaniom laboratoryjnym oraz badaniom in situ na zapo偶arowanej ha艂dzie odpad贸w pow臋glowych, w celu oceny ich skuteczno艣ci. Jako miar臋 skuteczno艣ci przyj臋to wzgl臋dny spadek emisji powierzchniowej par rt臋ci zwi膮zany z wykonaniem warstw absorpcyjno-izoluj膮cych z opracowanych mieszanin.This paper presents the results of laboratory tests and field research whose main objective was to develop the composition of mixtures mitigating processes of mercury release to the environment from mine waste dumps, and to develop a methodology for its permanent bonding (absorption). In the ongoing work we use waste materials from energy, coal mining and natural gas mining. The developed mixture to reduce emissions of mercury vapours were subject to laboratory tests and studies in situ on the heap of coal wastes with the risk of spontaneous combustion in order to evaluate effectiveness of this mixture. As a measure of efficacy, the relative decrease in the surface of the mercury vapor emissions, associated with the implementation of an absorption-insulating layers of the prepared mixtures, was assumed

    Evaluating the possibilities of obtaining initial concentrates of rare earth elements (REEs) from fly ashes

    Get PDF
    The article presents the results of initial laboratory research into the possibilities of obtaining REE from fly ash from one of Polish powerhouses. In the work the authors have presented the results of investigations into the obtaining of initial REEs concentrations from fly ashes by physicochemical and hydrometallurgical methods. These investigations provide a basis for developing a technology of RRE recovery from fly ashes produced in the process of hard coals combustion
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