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 PDF

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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
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Prior art keywords
lead
content
zinc
calcine
shaft furnaces
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EP81201243A
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German (de)
French (fr)
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EP0056880A1 (en
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Dirk Dr. Dipl.-Chem. Hankel
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GEA Group AG
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Metallgesellschaft AG
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    • 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.

Beispiel 1example 1

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 (Durchmesser 500 mm, 44 m breit) brikettiert.
Figure imgb0001
 A zinc screen with the following composition and grain size was roasted in a semi-technical fluid bed system:
  • 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 (diameter 500 mm, 44 m wide) briquetted.
Figure imgb0001

Beispiel 2Example 2

Es wurden zwei Brikettierversuche mit dem Röstgut ohne Zuschläge, jedoch bei unterschiedlichen Versuchsbedingungen durchgeführt.

Figure imgb0002
Bei Versuch Nr. 1 waren die Brikettierbedingungen also deutlich günstiger. Dies macht sich bei den Brikettqualitäten und der Brikettierleistung bemerkbar:
Figure imgb0003
 Two briquetting tests were carried out with the roasted material without additives, but under different test conditions.
Figure imgb0002
 In experiment No. 1, the briquetting conditions were therefore significantly more favorable. This is noticeable in the briquette qualities and the briquetting performance:
Figure imgb0003

Beispiel 3Example 3

Es wurden je 10 Briketts aus den Versuchen Nr.4 und 5 getestet:

Figure imgb0004
Die Festigkeit nach teilweiser Reduktion ist in der Figur dargestellt.10 briquettes from tests No. 4 and 5 were tested:
Figure imgb0004
 The strength after partial reduction is shown in the figure.

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)

1. A process of producing briquettes to be charged to zinc-producing shaft furnaces, in which process calcine which has been obtained by roasting in a fluidized bed and contains zinc oxide is subjected to hot briquetting, characterized in that the calcine is provided with a content of metallic lead and/or lead oxide corresponding to at least 3% lead, non-caking coal having a low content of volatile constituents is admixed to the calcine, a Pb:C weight ratio of at least 1 is adjusted, and the mixture is briquetted at a compacting temperature of 250 to 470°C and under an applied pressure amounting to 4 to 20 metric tons per centimeter of the width of the rolls when said pressure is dynamically measured.
2. A process according to claim 1, characterized in that the mixture to be briquetted has a lead content of 3 to 12% by weight, a carbon content of 2 to 6% by weight and a Pb:C weight ratio of 1.5 to 2.
EP81201243A 1981-01-22 1981-11-02 Process for the production of an agglomerated burden for zinc shaft furnaces Expired EP0056880B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813101886 DE3101886A1 (en) 1981-01-22 1981-01-22 METHOD FOR PRODUCING A BRIQUETTED INSERT MATERIAL FOR ZINC CHAMBER OVENS
DE3101886 1981-01-22

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EP0056880A1 EP0056880A1 (en) 1982-08-04
EP0056880B1 true EP0056880B1 (en) 1984-06-20

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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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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
CA988305A (en) * 1972-12-11 1976-05-04 Colin F. Harris 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

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DE3164341D1 (en) 1984-07-26
PL234779A1 (en) 1982-08-16
EP0056880A1 (en) 1982-08-04
RO84192A (en) 1984-05-23
DE3101886A1 (en) 1982-08-26
RO84192B (en) 1984-07-30
JPS57143446A (en) 1982-09-04
US4525207A (en) 1985-06-25

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