US4651656A
Expired / Lapsed
US
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Method for processing a heavy-metal-containing residue from the chemical industry
Assignee: Primetals Technologies Austria GmbH
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Filing: 1984-10-30
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Granted: 1987-03-24
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Expires: 2004-10-30
Abstract
Abstract There is disclosed a method for processing heavy-metal-containing residues from the chemical industry. For an economical and at the same time ecologically safe processing of the heavy-metal-containing residues, the heavy-metal-containing residues are introduced into a primary-gas reaction zone of a shaft gasifier containing at least one solid bed of carbon-containing material. Slag-forming substances are introduced together with the charge substances and/or together with the solid-bed formers to absorb and set the heavy metals. The lower zone of the solid bed is maintained at a temperature above the slag and ash melting temperatures. The viscosity of the slag is less than 100 poise.
Inventors
- 👤 Felix Wallner
- 👤 Adam Krier
- 👤 Walter Lugscheider
- 👤 Gotthard Uckert
- 👤 Paul Freimann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:10
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; C; C10; C10J; C10J3/00; C10J3/02; C10K; C10K1/00; C10K1/02; C10K1/08; F; F23; F23G; F23G5/00; F23G5/08; F23G5/085; C10J2200/00; C10J2200/15; C10J2200/156; C10J2300/00; C10J2300/09; C10J2300/0953; C10J2300/0959; C10J2300/0973; C10J2300/0976; C10J2300/12; C10J2300/1223; C10J2300/18; C10J2300/1807
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
158 words
A method for processing the combustible residue of a chemical process, which residue contains heavy metal components, in a shaft gasifier having a primary-gas reaction zone and a secondary-gas reaction zone, said method comprising the steps of forming a solid bed of carbon-containing material in the primary-gas reaction zone of said gasifier, introducing charging substances including an oxygen bearing gas and said heavy-metal-containing residue into said primary-gas reaction zone, introducing into said gasifier slag-forming substances for absorbing and setting the heavy metals contained in said residue, burning said oxygen bearing gas and heavy metal containing residue to produce a primary gas in said primary-gas reaction zone and a secondary gas in said secondary-gas reaction zone, and maintaining a temperature in said solid bed at a level to produce slag and ash from said charging and slag-forming substances and above the melting point of said slag and ash, and to keep the viscosity of said slag below 100 poise.
Claim 2
Independent Claim
158 words
A method for processing the combustible residue of a chemical process, which residue contains heavy metal components, in a shaft gasifier having a primary-gas reaction zone and a secondary-gas reaction zone, said method comprising the steps of forming a solid bed of carbon-containing material in the primary-gas reaction zone of said gasifier, introducing charging substances including an oxygen bearing gas and said heavy-metal-containing residue into said primary-gas reaction zone, introducing into said gasifier slag-forming substances for absorbing and setting the heavy metals contained in said residue, burning said oxygen bearing gas and heavy metal containing residue to produce a primary gas in said primary-gas reaction zone and a secondary gas in said secondary-gas reaction zone, and maintaining a temperature in said solid bed at a level to produce slag and ash from said charging and slag-forming substances and above the melting point of said slag and ash, and to keep the viscosity of said slag below 100 poise.
Claim 3
Dependent Claim
33 words
A method as set forth in claim 1, wherein said slag-forming substances are introduced into said gasifier with at least one of said charging substances and said carbon-containing material forming said solid bed.
Claim 4
Dependent Claim
19 words
A method as set forth in claim 1 wherein the residue contains vanadium and said slag-forming substances are basic.
Claim 5
Dependent Claim
16 words
A method as set forth in claim 3, wherein said basic slag-forming substances are CaO-containing substances.
Claim 6
Dependent Claim
45 words
A method as set forth in claim 1 wherein the residue is ferrous and coke is introduced into said secondary-gas reaction zone to provide the carbon-containing material for the solid bed and to form an acidic slag comprising at least 40% of SiO 2 .
Claim 7
Dependent Claim
16 words
A method as set forth in claim 5, wherein said coke is comprised of metallurgical coke.
Claim 8
Dependent Claim
110 words
A method as set forth in claim 1, further comprising the step of reducing the formation of soot in said primary-gas reaction zone by applying at least one of the following measures: (a) supplying the oxygen-containing gas to said primary reaction zone so as to obtain a C/O 2 ratio of at least 0.45 to 0.8; (b) maintaining the hydrogen/oxygen ratio in said primary-reaction zone at at least 0.35 to 0.7; (c) maintaining the dwell time for the primary gas in said primary-gas reaction zone between 0.2 to 1.5 seconds; and (d) maintaining the dwell time for the secondary gas in said secondary-gas reaction zone between 1 to 6 seconds.
Claim 9
Dependent Claim
40 words
A method as set forth in claim 7, wherein said C/O 2 ratio is 0.6, said hydrogen/oxygen ratio is 0.5, and primary gas dwell time is 0.4 to 0.6 seconds, and said secondary-gas dwell time is 2 to 3 seconds.
Claim 10
Dependent Claim
22 words
A method as set forth in claim 1 wherein said slag-forming substances are granular and of a granulation size of 20 mm.
Claim 11
Dependent Claim
43 words
A method as set forth in claim 1, wherein product gas is produced in and leaves said shaft gasifier, and which further comprises filtering said product gas so as to obtain filtered-off dust, and supplying said filtered-off dust to said primary-gas reaction zone.
Claim 12
Dependent Claim
27 words
A method as set forth in claim 1, wherein sewage sludge is supplied to said primary-gas reaction zone as charging substance in addition to said heavy-metal-containing residue.
Claim 13
Dependent Claim
28 words
A method as set forth in claim 11, wherein said sewage sludge is supplied in an amount of up to 30% of the amount of said heavy-metal residue.
Claim 14
Dependent Claim
27 words
A method as set forth in claim 11, wherein said sewage sludge is mixed with said heavy-metal residue prior to being supplied to said primary-gas reaction zone.
Claim 15
Dependent Claim
35 words
A method as set forth in claim 11, further comprising the step of drying said sewage sludge to a maximum residual moisture of 50 to 60% prior to being supplied to said primary-gas reaction zone.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-23 | 1990-09-22 | 1991-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-23 | 1994-09-22 | 1995-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-23 | 1998-09-22 | 1999-03-24 | $7700.00 | Window Closed / Lapsed |