EP0056880B1 - Process for the production of an agglomerated burden for zinc shaft furnaces - Google Patents
Process for the production of an agglomerated burden for zinc shaft furnaces Download PDFInfo
- Publication number
- EP0056880B1 EP0056880B1 EP81201243A EP81201243A EP0056880B1 EP 0056880 B1 EP0056880 B1 EP 0056880B1 EP 81201243 A EP81201243 A EP 81201243A EP 81201243 A EP81201243 A EP 81201243A EP 0056880 B1 EP0056880 B1 EP 0056880B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lead
- content
- zinc
- calcine
- shaft furnaces
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000011701 zinc Substances 0.000 title claims description 15
- 229910052725 zinc Inorganic materials 0.000 title claims description 14
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims description 10
- 238000000034 method Methods 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 title description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 5
- 229910000464 lead oxide Inorganic materials 0.000 claims description 4
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 description 13
- 239000004484 Briquette Substances 0.000 description 5
- 239000000571 coke Substances 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010016334 Feeling hot Diseases 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/02—Preliminary treatment of ores; Preliminary refining of zinc oxide
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
Definitions
- the invention relates to a method for producing a briquetted feed material for zinc shaft furnaces, wherein roasted material containing zinc oxide from a fluidized bed roasting is subjected to hot briquetting.
- the sulfidic ore concentrates must first be roasted and made into pieces.
- the sintering roasting on a traveling grate is relatively complex, leads to an exhaust gas with a relatively low S0 2 content and causes problems with regard to pollution of the environment.
- the roasting in the fluidized bed largely avoids these problems, but the roasted fine-grained material has to be made into pieces in a separate process step.
- the object of the invention is to produce briquettes from the roasted material of fluidized bed roasts with as little effort as possible, which have good properties for processing in a zinc shaft furnace.
- This object is achieved according to the invention in that a metallic lead content and / or lead oxide content of at least 3%, calculated as lead, is set in the roasted material, non-baking coal with a low content of volatile constituents is mixed into the roasted material, the ratio of Pb to C. in% by weight is set to at least 1, and the mixture is briquetted at a press temperature of 250 to 470 ° C under a press pressure of 4 to 20 t / cm roll width, measured dynamically.
- the roasted material is obtained as bed discharge, cyclone discharge and possibly discharge from other dedusting plants in a wide grain range of approximately 0 to 5 mm.
- the vast majority is in a grain size of less than 2 mm. It is very important that the individual discharges are mixed together very well.
- the admixed metallic lead and / or oxidic lead generally comes from the operation of the zinc shaft furnace itself, e.g. Trass from the pump sump of the condenser, dust from the room dust and filter sludge from the gas wash.
- the substances containing the metallic lead and / or oxidic lead are also used in a grain size of about 0 to 5 mm.
- the addition of metallic lead and / or lead oxide can be up to about 15% by weight, calculated as lead.
- the non-baking coals can contain up to about 6% volatiles such as coke breeze and anthracite. Temperatures in the upper range of the pressing temperature result in higher strength of the briquettes. This also applies to higher pressures. The pressures are measured dynamically, i.e. during the operation of the press.
- a preferred embodiment is that the lead content is 3 to 12%, the carbon content is 2 to 6% and the ratio of Pb to C is set to 1.5 to 2. These areas result in briquettes with particularly good properties.
- the advantages of the invention are that the pellets have a good initial reducibility and thus a good overall reducibility in a relatively short time, have good and sufficient mechanical strength, can be produced without great effort, and the briquetting takes place without subsequent heating of the discharge material of the fluidized bed can.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines brikettierten Einsatzmaterials für Zink-Schachtöfen, wobei Zinkoxid enthaltendes Röstgut aus einer Wirbelschichtröstung einer Heissbrikettierung unterworfen wird.The invention relates to a method for producing a briquetted feed material for zinc shaft furnaces, wherein roasted material containing zinc oxide from a fluidized bed roasting is subjected to hot briquetting.
Für die Zinkgewinnung im Schachtofen müssen die sulfidischen Erzkonzentrate vorher abgeröstet und stückig gemacht werden. Die Sinterröstung auf einem Wanderrost ist relativ aufwendig, führt zu einem Abgas mit relativ niedrigem S02-Gehalt und verursacht Probleme im Hinblick auf die Verschmutzung der Umwelt. Die Röstung in der Wirbelschicht vermeidet zwar diese Probleme weitgehend, jedoch muss das abgeröstete feinkörnige Material in einem separaten Verfahrensschritt in stückige Form gebracht werden.To extract zinc in the shaft furnace, the sulfidic ore concentrates must first be roasted and made into pieces. The sintering roasting on a traveling grate is relatively complex, leads to an exhaust gas with a relatively low S0 2 content and causes problems with regard to pollution of the environment. The roasting in the fluidized bed largely avoids these problems, but the roasted fine-grained material has to be made into pieces in a separate process step.
Aus der GB-PS 1 302864 ist es bekannt, das Röstgut aus einer Wirbelschichtröstung ohne Zusatz von kohlenstoffhaltigen Bindemitteln bei Temperaturen von mindestens 500°C und einem Druck von 0,157 bis 3,15 t/cm2 zu brikettieren. Die Reduzierbarkeit ist gegenüber Sinter jedoch wesentlich schlechter.From GB-PS 1 302864 it is known to briquette the roasted material from a fluidized bed roasting without the addition of carbon-containing binders at temperatures of at least 500 ° C. and a pressure of 0.157 to 3.15 t / cm 2 . However, the reducibility is significantly worse compared to sinter.
Aus der DE-AS 2360346 ist es bekannt, Briketts unter Einbindung von Koksgrus herzustellen. Dazu muss aber das Zinkoxid und gegebenenfalls Bleioxid sehr feinkörnig sein, wie es z.B. als Wälz-Oxid anfällt. Weiterhin muss dieses pulverförmige Material zunächst zu Pellets mit einem Durchmesser von 2 bis 10 mm geformt werden, ehe die Brikettierung der auf 500 bis 800°C erwärmten Pellets erfolgt. Der Pelletiervorgang bedeutet einen zusätzlichen Arbeitsgang, ausserdem müssen die Pellets vor der Brikettierung getrocknet werden, da sonst die Briketts platzen und Feuchtigkeit im Zinkschachtofen unerwünscht ist (Reoxidation des Zn-Dampfes).From DE-AS 2360346 it is known to produce briquettes with the inclusion of coke breeze. To do this, however, the zinc oxide and possibly lead oxide must be very fine-grained, e.g. accumulates as rolling oxide. Furthermore, this powdery material must first be shaped into pellets with a diameter of 2 to 10 mm before the briquetting of the pellets heated to 500 to 800 ° C takes place. The pelletizing process means an additional step, in addition the pellets must be dried before the briquetting, otherwise the briquettes will burst and moisture in the zinc shaft furnace is undesirable (reoxidation of the Zn vapor).
Aus V. Tafel «Lehrbuch der Metallhüttenkunde» 1953, Band 11, Seiten 518/19 ist es bekannt, für das Zinkgewinnungsverfahren der stehenden Muffel das Röstgut mit backender Kohle unter Zusatz eines Bindemittels zu brikettieren und die Briketts vor dem Einsatz in die Muffeln zu verkoken. Weiterhin ist es bekannt, Erze oder oxidische Stoffe unter Zusatz von backenden Kohlen oder bituminösen Bindemitteln zu brikettieren, wobei diese durch Erhitzung in den plastischen Bereich gebracht werden (DE-AS 1252623, DE-OS 2335669, DE-PS 718967, US-PS 3212877). Bei diesen Verfahren muss eine separate Verkokung erfolgen und es besteht die Gefahr von Rissebildung und Zerplatzen der Briketts durch ausgeriebene flüchtige Bestandteile.From V. Tafel “Textbook of Metallurgy” 1953, volume 11, pages 518/19, it is known for the zinc extraction process of the standing muffle to briquette the roasted material with baking coal with the addition of a binder and to coke the briquettes into the muffle before use . It is also known to briquette ores or oxidic substances with the addition of baking coals or bituminous binders, these being brought into the plastic region by heating (DE-AS 1252623, DE-OS 2335669, DE-PS 718967, US Pat. No. 3,212,877 ). These processes require separate coking and there is a risk of cracking and bursting of the briquettes due to the volatile constituents being rubbed out.
Der Erfindung liegt die Aufgabe zugrunde, mit möglichst geringem Aufwand aus dem Röstgut von Wirbelschichtröstungen Briketts herzustellen, die gute Eigenschaften für die Verarbeitung im Zinkschachtofen besitzen.The object of the invention is to produce briquettes from the roasted material of fluidized bed roasts with as little effort as possible, which have good properties for processing in a zinc shaft furnace.
Die Lösung dieser Aufgabe erfolgt erfindungsgemäss dadurch, dass in dem Röstgut ein metallischer Bleigehalt und/oder Bleioxidgehalt von mindestens 3%, gerechnet als Blei, eingestellt wird, dem Röstgut nichtbackende Kohle mit geringem Gehalt an flüchtigen Bestandteilen zugemischt wird, das Verhältnis von Pb zu C in Gew.-% auf mindestens 1 eingestellt wird, und die Mischung bei einer Presstemperatur von 250 bis 470°C unter einem Pressdruck von 4 bis 20 t/cm Walzenbreite, dynamisch gemessen, brikettiertwird.This object is achieved according to the invention in that a metallic lead content and / or lead oxide content of at least 3%, calculated as lead, is set in the roasted material, non-baking coal with a low content of volatile constituents is mixed into the roasted material, the ratio of Pb to C. in% by weight is set to at least 1, and the mixture is briquetted at a press temperature of 250 to 470 ° C under a press pressure of 4 to 20 t / cm roll width, measured dynamically.
Das Röstgut fällt als Bett-Austrag, Zyklon-Austrag und eventuell Austrag aus weiteren Entstaubungsanlagen in einem weiten Kornbereich von etwa 0 bis 5 mm an. Der weitaus grösste Teil liegt in einer Korngrösse unter 2 mm vor. Es ist sehr wichtig, dass die einzelnen Austräge sehr gut miteinander vermischt werden. Das zugemischte metallische Blei und/oder oxidische Blei stammt im allgemeinen aus dem Betrieb des Zink-Schachtofens selbst, wie z.B. Trass aus dem Pumpensumpf des Kondensers, Staub aus der Raumentstaubung und Filterschlamm aus der Gaswäsche. Die das metallische Blei und/oder oxidische Blei enthaltenden Stoffe werden ebenfalls in einer Korngrösse von etwa 0 bis 5 mm eingesetzt. Der Zusatz an metallischem Blei und/ oder Bleioxid kann bis zu etwa 15 Gew.-%, gerechnet als Blei, betragen. Die nichtbackenden Kohlen können einen Gehalt an flüchtigen Bestandteilen bis zu etwa 6 Gew.-% haben, wie Koksgrus und Anthrazite. Temperaturen im oberen Bereich der Presstemperatur ergeben höhere Festigkeiten der Briketts. Dies trifft ebenfalls für höhere Pressdrücke zu. Die Pressdrücke werden dynamisch gemessen, d.h. während des Betriebes der Presse.The roasted material is obtained as bed discharge, cyclone discharge and possibly discharge from other dedusting plants in a wide grain range of approximately 0 to 5 mm. The vast majority is in a grain size of less than 2 mm. It is very important that the individual discharges are mixed together very well. The admixed metallic lead and / or oxidic lead generally comes from the operation of the zinc shaft furnace itself, e.g. Trass from the pump sump of the condenser, dust from the room dust and filter sludge from the gas wash. The substances containing the metallic lead and / or oxidic lead are also used in a grain size of about 0 to 5 mm. The addition of metallic lead and / or lead oxide can be up to about 15% by weight, calculated as lead. The non-baking coals can contain up to about 6% volatiles such as coke breeze and anthracite. Temperatures in the upper range of the pressing temperature result in higher strength of the briquettes. This also applies to higher pressures. The pressures are measured dynamically, i.e. during the operation of the press.
Eine vorzugsweise Ausgestaltung besteht darin, dass der Bleigehalt 3 bis 12% beträgt, der Kohlenstoffgehalt 2 bis 6% beträgt und das Verhältnis von Pb zu C auf 1,5 bis 2 eingestellt wird. Diese Bereiche ergeben Briketts mit besonders guten Eigenschaften.A preferred embodiment is that the lead content is 3 to 12%, the carbon content is 2 to 6% and the ratio of Pb to C is set to 1.5 to 2. These areas result in briquettes with particularly good properties.
Die Erfindung wird anhand von Beispielen näher erläutert.The invention is explained in more detail by means of examples.
Es wurde eine Zinkblende mit folgender Zusammensetzung und Körnung in einer halbtechnischen Wirbelschichtanlage geröstet:
- 47,7% Zn
- 1,75% Pb
- 11,5% Fe
- 31,8% S
- 98,4% <2,000 mm
- 88,4% <0,045 mm
Das Röstgut (Mischung aus Bettaustrag + Zyklonausträgen) hatte folgende Kornzusammensetzung:
- 98,2% <2,000 mm
- 39,1% <0,045 mm
- 5,0% <0,016 mm
Das Röstgut wurde jeweils mit Brikettier-Rückgut (2 bis 8 mm) und gegebenenfalls mit bleihaltigen Rückläufen aus dem Zinkschachtofen (40% Zn, 30% Pb, 100% <3mm) bzw. Rückläufen plus Koksgrus (2,9% flüchtige Bestandteile, 100% <0,5 mm) heiss gemischt und, in einer Hitze, auf einer halbtechnischen Doppelwalzenpresse (
- 47.7% Zn
- 1.75% Pb
- 11.5% Fe
- 31.8% p
- 98.4% <2,000 mm
- 88.4% <0.045 mm
The roasted material (mixture of bed discharge + cyclone discharges) had the following grain composition:
- 98.2% <2,000 mm
- 39.1% <0.045 mm
- 5.0% <0.016 mm
The roasted goods were each made with briquette residues (2 to 8 mm) and optionally with leaded ones Returns from the zinc shaft furnace (40% Zn, 30% Pb, 100% <3mm) or returns plus coke breeze (2.9% volatile components, 100% <0.5 mm) mixed hot and, in a heat, on a semi-technical Double roller press (
Es wurden zwei Brikettierversuche mit dem Röstgut ohne Zuschläge, jedoch bei unterschiedlichen Versuchsbedingungen durchgeführt.
Es wurden je 10 Briketts aus den Versuchen Nr.4 und 5 getestet:
Die Vorteile der Erfindung bestehen darin, dass die Pellets eine gute Anfangsreduzierbarkeit und damit eine gute Gesamtreduzierbarkeit in relativ kurzer Zeit aufweisen, eine gute und ausreichende mechanische Festigkeit besitzen, ohne grossen Aufwand hergestellt werden können, und die Brikettierung ohne nachträgliche Aufheizung des Austragsmaterials der Wirbelschicht erfolgen kann.The advantages of the invention are that the pellets have a good initial reducibility and thus a good overall reducibility in a relatively short time, have good and sufficient mechanical strength, can be produced without great effort, and the briquetting takes place without subsequent heating of the discharge material of the fluidized bed can.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3101886 | 1981-01-22 | ||
| DE19813101886 DE3101886A1 (en) | 1981-01-22 | 1981-01-22 | METHOD FOR PRODUCING A BRIQUETTED INSERT MATERIAL FOR ZINC CHAMBER OVENS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0056880A1 EP0056880A1 (en) | 1982-08-04 |
| EP0056880B1 true EP0056880B1 (en) | 1984-06-20 |
Family
ID=6123064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP81201243A Expired EP0056880B1 (en) | 1981-01-22 | 1981-11-02 | Process for the production of an agglomerated burden for zinc shaft furnaces |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4525207A (en) |
| EP (1) | EP0056880B1 (en) |
| JP (1) | JPS57143446A (en) |
| DE (2) | DE3101886A1 (en) |
| PL (1) | PL234779A1 (en) |
| RO (1) | RO84192B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3529084C1 (en) * | 1985-08-14 | 1986-10-16 | Thyssen Stahl AG, 4100 Duisburg | Process and plant for the production of binderless hot briquettes |
| CA2087557C (en) * | 1992-07-31 | 2000-04-25 | Matthew Raskin | Method for removing catalyst |
| JP2580799Y2 (en) * | 1993-05-25 | 1998-09-17 | 三相電機株式会社 | Electric motor and its stator |
| JP2653018B2 (en) * | 1993-11-24 | 1997-09-10 | 日本電気株式会社 | Transimpedance type amplifier circuit |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1041256B (en) * | 1953-05-13 | 1958-10-16 | Nat Smelting Co Ltd | Process for the extraction of lead and zinc |
| BE653612A (en) * | 1963-09-30 | |||
| ES340602A1 (en) * | 1966-05-17 | 1968-06-01 | Boliden Ab | A method of Converting a Finely-Grained Material to a more Coarsely-Grained Material |
| GB1149760A (en) * | 1966-07-05 | 1969-04-23 | Imp Smelting Corp Ltd | Improvements in or relating to blast furnace operation |
| IL34874A0 (en) * | 1969-07-14 | 1970-09-17 | Metallurgical Processes Ltd | The preparation of feed material for a blast furnace |
| IE38603B1 (en) * | 1972-12-11 | 1978-04-26 | Metallurgical Processes Ltd | Preparation of feed material for a blast furnace |
| DE2335669A1 (en) * | 1973-07-13 | 1975-02-06 | Metallgesellschaft Ag | PROCESS FOR THE MANUFACTURING OF ORECAKE HOT BRIQUETTES FOR SELF-DIVIDING |
| ZA793158B (en) * | 1978-07-04 | 1980-07-30 | Isc Smelting | Roasting of sulphide materials |
-
1981
- 1981-01-22 DE DE19813101886 patent/DE3101886A1/en not_active Withdrawn
- 1981-11-02 DE DE8181201243T patent/DE3164341D1/en not_active Expired
- 1981-11-02 EP EP81201243A patent/EP0056880B1/en not_active Expired
-
1982
- 1982-01-14 RO RO106327A patent/RO84192B/en unknown
- 1982-01-21 JP JP57008235A patent/JPS57143446A/en active Pending
- 1982-01-21 PL PL23477982A patent/PL234779A1/xx unknown
-
1984
- 1984-01-13 US US06/570,481 patent/US4525207A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| RO84192A (en) | 1984-05-23 |
| EP0056880A1 (en) | 1982-08-04 |
| DE3101886A1 (en) | 1982-08-26 |
| PL234779A1 (en) | 1982-08-16 |
| DE3164341D1 (en) | 1984-07-26 |
| RO84192B (en) | 1984-07-30 |
| JPS57143446A (en) | 1982-09-04 |
| US4525207A (en) | 1985-06-25 |
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