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Method for reducing heavy metals of flue gases

A flue gas, heavy metal technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as danger

Inactive Publication Date: 2007-03-14
LHOIST RECH & DEV SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Toxic hydrogen sulfide (H 2 The handling of S) is a hazardous operation and the strict molar ratios required to avoid any subsequent oxidation reactions are very restrictive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use of non-functionalized sepiolite in a household waste incinerator with a capacity of 8t / h waste, which produces about 50,000Nm 3 / h of flue gas to be treated. The sepiolite, 90% of which has a particle size of less than 600 μm, is metered by a screw and injected pneumatically at 150° C. at a rate of 12 kg / h into the air stream and then lodged in a fabric filter.

[0025] Measurement of heavy metal content: mercury and (cadmium + thallium) in gases downstream of injection operations and filters. These heavy metals are measured by inductively coupled plasma atomic absorption or emission spectrometry:

[0026] - measurement of solid particles transported by the gas, trapped by the filter and subsequently mineralized, and

[0027] - measurement of the volatile fraction trapped by bubbling in a specific absorption solution;

[0028] The content of heavy metals is the sum of the values ​​measured for the particulate and volatile fractions.

[0029] Concentrations norma...

Embodiment 2

[0032] In a similar manner, the same sepiolite as in Example 1 was injected into the gas of another household waste incinerator at a high temperature of 190°C. The capacity of this incinerator is 5t / h, it produces 30,000Nm 3 / h air flow; as in Example 1, metered sepiolite was added at a speed of 5.5 kg / h.

[0033] The mercury concentration measured according to the method shown in Example 1 before and after adding sepiolite is 42 μg / Nm respectively 3 and 8μg / Nm 3 , that is, the reduction rate of mercury is 80%.

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Abstract

A method for reducing heavy metals, in particular in mercury, present in flue gases, includes the step of bringing the flue gases into contact with a particular class of sorbent material in the dry state. A preferred class of dry sorbent materials can be provided from a mineral compound selected from among halloysites and phyllosilicates of the palygorskite subgroup and the sepiolite subgroup of the palygorskite-sepiolite group according to the Dana classification. Mineral compounds of this group have been shown to provide a reduction in heavy metals, in particular in mercury, present in flue gases.

Description

technical field [0001] The invention relates to a method for reducing the presence of heavy metals, especially mercury, in flue gases (gaz de fumées), which method comprises contacting the flue gas with sorption solid substances in the dry state step. Background technique [0002] The term "heavy metal" refers to the following compounds, listed here for illustration only: francium, radium, lanthanides, actinides, zirconium, hafnium, vanadium, niobium, tantalum, Chromium, molybdenum, tungsten, manganese, technetium, rhenium, iron, ruthenium, osmium, cobalt, rhodium, iridium, nickel, palladium, platinum, copper, silver, gold, zinc, cadmium, mercury, gallium, indium, thallium, germanium, Tin, lead, arsenic, antimony, bismuth, polonium. The reduction method of the present invention mainly concerns the most common heavy metals, namely lead, chromium, copper, manganese, antimony, arsenic, cobalt, nickel, vanadium, cadmium, thallium and mercury, preferably lead, thallium, cadm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/64
CPCB01J20/12B01D53/64
Inventor A·冈班A·劳德特
Owner LHOIST RECH & DEV SA
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