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Method for removing mercury from mercury pollution materials

A mercury pollution and removal technology, applied to the removal of solid waste, etc., to achieve the effect of reducing mercury content

Inactive Publication Date: 2006-10-18
HENDERIKS HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] While each of these methods fulfills the functional need to provide a treatment for reducing the mercury content of mercury-contaminated materials, there is still a need for more efficient and economical methods

Method used

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  • Method for removing mercury from mercury pollution materials

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0045] Assembled as figure 1 Schematic representation of equipment to process a quantity of coal combustion fly ash known to contain mercury. A microwave frequency of 915MHz is used. The fluidizing gas is ambient air.

[0046] The feed fly ash is processed at a temperature of about 820°C. The material passed through the reactor vessel at a rate of approximately 6 pounds per minute (lbs) throughout the approximately 400 minute duration of the test.

[0047] The mercury content in the feed was measured to be 79 parts per billion (ppb). The unburned carbon content, characterized by LOI (loss on ignition), was measured to be 8.5%.

[0048] Treated ash samples were periodically taken from the experiment and measured for mercury content. The results obtained are shown in Table 1 below. The LOI of the treated material was 1.5%.

[0049] time

[0050] As can be seen from the table, once the process has reached steady state operation with respect to mercury precipitat...

example 2

[0052] Assembled as figure 1 Schematic representation of equipment to process a quantity of coal combustion fly ash known to contain mercury. A microwave frequency of 915MHz is used. The fluidizing gas is ambient air.

[0053] The feed fly ash is processed at a temperature of about 820°C. The material passed through the reactor vessel at a rate of approximately 6 pounds per minute (lbs) throughout the approximately 500 minute duration of the test.

[0054] The mercury content in the feed was measured to be 33 parts per billion (ppb). The unburned carbon content, characterized by LOI (loss on ignition), was measured to be 17.5%.

[0055] Treated ash samples were periodically taken from the experiment and measured for mercury content. The results obtained are shown in Table 2 below. The LOI of the treated material was 0.4%.

[0056] time (min

example 3

[0058] Assembled as figure 1 Schematic representation of equipment to process a quantity of coal combustion fly ash known to contain mercury. A microwave frequency of 915MHz is used. The fluidizing gas is ambient air.

[0059] The feed fly ash is processed at a temperature of about 820°C. The material passed through the reactor vessel at a rate of approximately 6 pounds per minute (lbs) throughout the approximately 400 minute duration of the test.

[0060] The mercury content in the feed was measured to be 142 parts per billion (ppb). The unburned carbon content, characterized by LOI (loss on ignition), was measured to be 4.5%.

[0061] Treated ash samples were periodically taken from the experiment and measured for mercury content. The results obtained are shown in Table 3 below. The final LOI was 0.3%.

[0062] time

(minute)

product mercury

(ppb)

cyclone mercury

(ppb)

0

142

142

187

8

7

...

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Abstract

The microwave method of reducing mercury content in mercury contaminated material includes the following steps: 1. setting the mercury contaminated material inside one microwave reactor; 2. providing airflow to the microwave reactor to stir the mercury contaminated material; and 3.exposing the mercury contaminated material to microwave radiation to raise the temperature to over 357 deg.c, so as to produce vapor containing mercury and the treated material. The said method may be also used to reduce contents of mercury and carbon simultaneously, and some no-carbon material may be used in the reactor.

Description

technical field [0001] The invention relates to a method for reducing mercury content in mercury-contaminated materials. In particular, the present invention relates to the use of microwave energy to reduce mercury levels in fly ash and sorbent materials. Background technique [0002] Mercury is present in gas streams from industrial incinerators and boilers such as those used to burn coal to generate gas flow / electricity or in municipal solid waste treatment to generate steam or remove waste. known pollutants. The high environmental toxicity of mercury is well established, and thus mercury scrubbing has become a necessary (albeit expensive) part of exhaust gas treatment. [0003] Mercury scrubbing from exhaust gas streams can be accomplished by several methods, which vary in complexity, cost, and effectiveness. These methods include sorbent (carbon or alkaline) filtration, oxidation, chlorination and others. [0004] Carbon adsorption filtration is known in the art and ...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 詹姆士·M·特朗奎拉
Owner HENDERIKS HLDG
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