Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"Coal processing"”.
-
Characterizing the potential environmental risks of South African coal processing wastes
The environmental impacts of coal processing wastes are a challenge in South Africa as large amounts of coal wastes are produced annually, pegged at 60 million tons per year according to Eberhard (2011). Whilst the fossil fuel-based industry is in decline globally, coal is likely to remain the …
-
LABORATORY AND FIELD INVESTIGATIONS OF COAL AND COAL PROCESSING WASTE - SIMULATION OF PRACTICES THAT MINIMIZE SULFATE AND CHLORIDE
The potential for mobilization of SO4 and Cl from coal stockpiles and coal processing waste and refuse (waste rock) disposal areas to the receiving streams and groundwater is an environmental concern and proper management practices are necessary to minimize the impact of these discharges. In an …
-
Residual Diesel Range Organics and Selected Frothers in Process Waters from Fine Coal Flotation
… is to examine some of the potential fates of processing reagents in a coal preparation plant. The focus is specifically on petro-diesel (termed "diesel" in this paper), which is used as a collector in the flotation of fine coal. Diesel range organics (DRO) and polyaromatic hydrocarbons (PAHs) …
-
Evaluation of Methods for Improving Classifying Cyclone Performance
Most mineral and coal processing plants are forced to size their particulate streams in order to maximize the efficiency of their unit operations. Classifiers are generally considered to be more practical than screens for fine sizing, but the separation efficiency decreases dramatically for …
-
Development of a video-based slurry sensor for on-line ash analysis
The implementation of process control in fine coal processing operations has traditionally been limited by the lack of adequate on-line ash sensors. Several nuclear based analyzers are available, yet none have seen widespread acceptance by the coal industry. This is due largely to their high cost, …
-
Precombustion Removal of Hazardous Air Pollutant Precursors
… to evaluate the capabilities of physical coal cleaning technologies on the removal of trace elements from coal. Test work was completed on Pittsburgh No. 8 seam coal that was processed using physical cleaning techniques (i.e., crushing, dense media separation, froth flotation, and enhanced …
-
Identification of Improved Stratigies for Processing Fine Coal
In modern coal preparation plants, solid-solid and solid-liquid separation processes used to treat fine coal are least efficient and most costly operations. For example, field studies indicate that the froth flotation process, which is normally used to treat minus (-0.2 mm) fine coal, often …
-
Improved strategies for processing fine coal streams
In modern coal preparation plants, solid-solid and solid-liquid separation processes used to treat fine coal are least efficient and most costly operations. For example, field studies indicate that the froth flotation process, which is normally used to treat minus (-0.2 mm) fine coal, often …
-
Early-stage design and development of mine waste valorisation technologies with expert input: a case study of South African sulfide-enriched coal waste
… complex due to residual target minerals and processing chemicals present in the gangue components. Furthermore, whilst the technologies used may not be novel, their application in the processing of wastes is generally untested or inadequately researched. Working within such a context, with …
-
New Methodologies for the Characterization and Separation of Rare Earth Elements Present in Coal
… analysis was created and applied to two coal samples from separate formations. This new method of liberation analysis attempts to remove sources of error found in the traditional form of liberation analysis. This new method is capable of producing results comparable to multiple iterations …
-
Optimum Processing of 1 mm by Zero Coal
Coal in the finer particle size ranges (below 1 mm) has always suffered from poor cleaning efficiencies. This problem has been exacerbated in recent years with the increased amount of high ash fines due to continuous mining machines and the mining of dirtier coal seams. In the present work, it is …
-
Hydrophobic-Hydrophilic Separation Process for the Recovery of Ultrafine Particles
… that the rejected materials from copper and coal processing plants contain significant amounts of valuable metals. As such, this rejected material can be considered as potential secondary sources for extracting copper and REEs, which may help combat future supply risks for the supply of …
-
Toxicity of zinc, copper, and sediments to early life stages of freshwater mussels in the Powell River, Virginia
… of water with toxic substances from coal washing and waste piles. Historical water quality data of the Powell River have documented concentrations of metals at levels determined to be toxic to molluscs, specifically zinc (Zn) and copper (Cu). Acute toxicity tests with Zn, Cu, and …