Overview Lead and Zinc RecoveryA soil washing and leaching process was tested for removing lead from soils. A soilwashing circuit, including size and gravity separations, was employed to remove the coarse metallic lead particles, while the leaching was applied to remove fine metallic lead particles and other lead species. The soilwashing tests proved that the metallic lead particles larger than 0.15 mm (100 mesh) could be effectively removed. The sodiumchloride-based leaching solution with ferric chloride or sodium hypochlorite as oxidants was adopted in the leaching. The leaching experimental results indicated that under the pH of 2 and Eh of 1,300 mV, the metallic lead particles smaller than 0.15 mm and other lead species can be dissolved in the leaching solution within 60 minutes.
Chemical and physical properties of typical low-rank coal (LRC) ash are significantly different than bituminous coal ash. With the exception of extraneous ash, which is incorporated during mining or is due to ash partings within or between coal seams, LRC ash consists primarily of inherent ash that is bonded into the coal's organic matrix or finely disseminated mineral matter. This paper reviews the nature of ash from two Alaskan LRCs~both inherent and extraneous, and how this impacts the prospects of producing a low ash coal for formulation into low-rank coal-water fuel for utilization in heat engines. This study is particularly relevant in light of the recently funded Alaskan Low-Rank CoalWater Fuel-Diesel Project, which is designed to demonstrate the economic feasibility of commercial production and utilization of low-rank coal-water fuel (LRCWF) in an oil-designed, 3 MWe boiler and a medium speed (400rpm) diesel engine (9.6 MWe). Washability data, proximate and ultimate analyses and ash composition analyses of two Alaskan LRC seams are used as a basis for this discussion. Recent research into the nuture and distribution of phosphorous in an Alaskan LRC is also discussed.
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