A Model Analysis of Metal Partitioning

Lee, C. C.

doi:10.1080/08940630.1988.10466437

Cited by 31 publications

(5 citation statements)

References 4 publications

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“…Two mechanisms are associated with the condensation process, namely, homogeneous nucleation and heterogeneous deposition (see e.g., Friedlander, 1977;Lee, 1988). The two mechanisms occur simultaneously but at different rates depending on process conditions.…”

Section: Metal Condensationmentioning

confidence: 99%

Metal Capture During Fluidized Bed Incineration of Wastes Contaminated with Lead Chloride

Chen

Hopper

et al. 1992

Combustion Science and Technology

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The emission of toxic metals during the incineration of solid wastes containing metals presents potential environmental and health hazards. Some of the metals in the effluent gases are of submicron size which conventional air pollution control devices may not always effectively collect. One of the alternative control technologies for heavy metal emissions is to use sorbents to capture metals through various mechanisms during incineration. Of the available incineration systems, the fluidized bed incinerator appears to be suitable for this purpose.The objective of this work was to experimentally study the characteristics of metal capture by various bed sorbents during fluidized bed incineration of wastes containing lead chloride. Experiments were carried out in a 76.2 mm ID fluidized bed of sand, limestone and aluminum oxide. Combustible test materials contaminated with lead chlorides were incinerated in the bed with different sorbents under different incineration conditions. The observed results indicated that the metal capture process is highly promising.Capture efficiency was observed to range from 4.9% to 94.5% depending on sorbent type and incinerator operating conditions. NOTATION a average particle diameter, mm P" vapor pressure, mm Hg Pb, lead concentration in agglomerated sorbent cluster, ppm Pb, lead concentration in incinerated bed sorbent, ppm Pb, lead concentration in original sorbent, ppm Ph, lead concentration in test wood, ppm T Incinerator temperature,°C U superficial velocity, cm/sec w" mass of collected agglomerated sorbent cluster, g w" mass of collected incinerated bed sorbent, g Iv, mass of original sorbent, g w,.. mass of test wood, g 1jJ. percent metal capture by agglomerated sorbent cluster IjJb percent metal capture by bed sorbent IjJj percent metal capture by cyclone ash IjJr total percent metal capture by sorbent c/J specific capture capacity, Ilg/g p density, g/cm 3

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Section: Metal Condensationmentioning

confidence: 99%

Metal Capture During Fluidized Bed Incineration of Wastes Contaminated with Lead Chloride

Chen

Hopper

et al. 1992

Combustion Science and Technology

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“…Numerous papers have reported the results of such calculations for a variety of different high-temperature applications. Lee 45 was one of the first to report the speciation of metals in an incinerator by performing equilibrium calculations. However, his calculations were only for a limited set of metallic compounds.…”

Section: Transfer Of Metallic Species To the Gas Phasementioning

confidence: 99%

Control of Toxic Metal Emissions from Combustors Using Sorbents: A Review

Biswas

1998

Journal of the Air & Waste Management Association

172

123

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This paper constitutes a review of the control of toxic metal emissions using sorbents. The objective of sorbent-injection methods is to effectively capture the metal species (preferably transform it to an environmentally benign form) and to suppress the fraction in the submicrometer mode. The design of an effective sorbent-injection methodology thus requires an understanding of the fate of the metallic species and its transformation pathways (transfer to the gas phase, subsequent chemistry at high temperatures, and aerosol formation and growth dynamics) in the combustor. Several different sorbent methodologies used for metals capture are discussed, and a mechanistic description is provided. The need for further experimentation and pilot scale testing is also emphasized.

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“…These models ignore kinetic and mass transfer limitations that may be important. In many models, only simple solid-phase species, such as reduced metals, oxides, chlorides, and sulfates, are considered (Lee, 1988;Mathews, 1988). Verhulst et al (1996) demonstrated that the inclusion of complex oxides in the model decreased the predicted volatility of copper and zinc.…”

Section: Thermodynamic Modelsmentioning

confidence: 99%

Volatility of Arsenic and Lead from Simulated Incinerator Slags

Overcamp¹,

Hoffman²,

Striebig³

et al. 1999

Environmental Engineering Science

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Experiments were conducted on arsenic and lead volatility from simulated slags containing either arsenic or lead. Samples were exposed to temperatures up to 900 C and atmospheres that were inert, oxidizing, reducing, or contained hydrogen chloride. Both arsenic and lead deposited within the system during the experiment, requiring a cleaning procedure to remove and capture the metal for measurement. Arsenic or lead volatility increased with increasing treatment time, temperature, and CO concentration. Lead volatility also increased with increasing HC1 concentration. The arsenic volatilized was two orders of magnitude less than lead for the same experimental conditions. The results show that under conditions similarly occurring in a hazardous waste incinerator, arsenic in a slag is relatively involatile, and only a small fraction of either arsenic or lead is volatilized.

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A Model Analysis of Metal Partitioning

Cited by 31 publications

References 4 publications

Metal Capture During Fluidized Bed Incineration of Wastes Contaminated with Lead Chloride

Metal Capture During Fluidized Bed Incineration of Wastes Contaminated with Lead Chloride

Control of Toxic Metal Emissions from Combustors Using Sorbents: A Review

Volatility of Arsenic and Lead from Simulated Incinerator Slags

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