نتایج جستجو برای: coal waste ash

تعداد نتایج: 131191  

2001
Tapiwa Gurupira Charles L. Jones Allen Howard John M. Stencel

Spherical and hollow fly ash particles having density < 1g/cm are known as cenospheres. Their concentration in coal combustion ash is typically << 1%; as a consequence, their value is relatively high (~$0.70/kg). However, cenospheres are really particles containing gas bubbles independent of their density. Hence, cenosphere densities can vary between 0.6 g/cm to near or greater than 2.0 g/cm. T...

Large reserves of coal in Tabas region of Iran are characterized by low ash and high caking index, suitable for use in metallurgy as coking coal. However, these coals cannot be gainfully utilized because of their high sulfur content. In this work, studies on desulfurization of Tabas coals were carried out in a batch reactor using various reagents. The most effective reagents,<...

2009
Fariborz Goodarzi

Bottom ashes collected from ESP and baghouse of seven pulverized coal-fired power plants using subbituminous and bituminous coal and a fluidized bed combustor using crushed bituminous coal were examined for their mineralogy and elemental composition. The results presented in this paper are based on the average of three samples collected from each power plant. The mineralogy of each sample was d...

Journal: :Sustainability 2022

Fly ash is a waste material obtained from burning of coal in thermal power plants. Coal consumption still very high and expected to remain above 38% globally. Therefore, large volumes fly are produced every year that need be managed as waste. Improper disposal can lead surface water ground pollution adversely affect human health environment. The use an agent stabilize soil has recently become p...

Journal: :Science 1979
J J Griffin E D Goldberg

Carbon particles extracted from sediments collected by box coring from southeastern Lake Michigan were compared with carbon particles extracted from oil, coal, and wood fly ash. Sediments deposited after 1900 contained coal, oil, and wood carbons; older sediments contained only wood carbon.

2014
Paula Teixeira Helena Lopes Ibrahim Gulyurtlu Nuno Lapa

Three species of biomass origin (straw pellets, olive cake and wood pellets) and two coals from different countries (Coal Polish and Coal Colombian) have been studied to understand the fate of their ash forming matter during the combustion process and to investigate the influence of co-firing biomass with coal. Three different approaches to investigate the ash behaviour were employed: (1) chemi...

Journal: :Environmental science & technology 2008
Yan Cao Hongcang Zhou Junjie Fan Houyin Zhao Tuo Zhou Pauline Hack Chia-Chun Chan Jian-Chang Liou Wei-Ping Pan

Four types of biomass (chicken waste, wood pellets, coffee residue, and tobacco stalks) were cofired at 30 wt % with a U.S. sub-bituminous coal (Powder River Basin Coal) in a laboratory-scale fluidized bed combustor. A cyclone, followed by a quartz filter, was used for fly ash removal during tests. The temperatures of the cyclone and filter were controlled at 250 and 150 degrees C, respectively...

Journal: :International journal of environmental research and public health 2015
J Marvin Herndon

The widespread, intentional and increasingly frequent chemical emplacement in the troposphere has gone unidentified and unremarked in the scientific literature for years. The author presents evidence that toxic coal combustion fly ash is the most likely aerosolized particulate sprayed by tanker-jets for geoengineering, weather-modification and climate-modification purposes and describes some of...

Journal: :British journal of industrial medicine 1984
V A Ruckley J M Fernie J S Chapman P Collings J M Davis A N Douglas D Lamb A Seaton

The pathology and dust content of lungs from 261 coalminers in relation to the appearances of their chest radiographs taken within four years of death were examined. Radiological opacities of coalworkers' pneumoconiosis were more profuse the more dust was retained in lungs. Among the men who had mined low rank coal--that is, with a relatively high proportion of ash--the increase in profusion wa...

Journal: : 2021

The article presents modern research on the development of compositions and technologies light aggregates based natural man-made raw materials, as well mixtures containing both materials. As a material component, shungite, clays, silica – materials-diatomite, trepel flask are used. coal-enrichment waste coal-containing waste, fly ash, ash slags, oil sludge paper Light aggregate is prepared acco...

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