DE2731862B1 - Process for obtaining zinc and iron compounds from the residue of old rubber pyrolysis, in particular from old tires - Google Patents

Process for obtaining zinc and iron compounds from the residue of old rubber pyrolysis, in particular from old tires

Info

Publication number
DE2731862B1
DE2731862B1 DE2731862A DE2731862A DE2731862B1 DE 2731862 B1 DE2731862 B1 DE 2731862B1 DE 2731862 A DE2731862 A DE 2731862A DE 2731862 A DE2731862 A DE 2731862A DE 2731862 B1 DE2731862 B1 DE 2731862B1
Authority
DE
Germany
Prior art keywords
residue
zinc
old
pyrolysis
iron compounds
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.)
Granted
Application number
DE2731862A
Other languages
German (de)
Other versions
DE2731862C2 (en
Inventor
Hans Bender
Rupert Hoell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE2731862A priority Critical patent/DE2731862C2/en
Priority to GB10858/78A priority patent/GB1599251A/en
Publication of DE2731862B1 publication Critical patent/DE2731862B1/en
Application granted granted Critical
Publication of DE2731862C2 publication Critical patent/DE2731862C2/en
Expired legal-status Critical Current

Links

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
    • C22B19/20—Obtaining zinc otherwise than by distilling
    • C22B19/22—Obtaining zinc otherwise than by distilling with leaching with acids
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/30—Active carbon
    • C01B32/312—Preparation
    • C01B32/318—Preparation characterised by the starting materials
    • C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/44—Carbon
    • C09C1/48—Carbon black
    • C09C1/482—Preparation from used rubber products, e.g. tyres
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006—Wet processes
    • C22B7/007—Wet processes by acid leaching
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Processing Of Solid Wastes (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Gasification And Melting Of Waste (AREA)

Description

Die Erfindung betrifft die Gewinnung von Zink- und Eisenverbindungen aus dem Rückstand einer Altgummipyrolyse bei gleichzeitiger Reinigung des Pyrolysegases von H2S.The invention relates to the extraction of zinc and iron compounds from the residue of a scrap rubber pyrolysis while at the same time cleaning the pyrolysis gas from H 2 S.

Durch die Wiedergewinnung der Zink- und Eisenverbindungen ist es möglich, den Aschegehalt des Rückstandes, nach schon erfolgter Magnetabscheidung großer Eisenteile, noch weiter zu senken. Gleichzeitig wird mit der Reinigung des Pyrolysegases von H2S eine SOrEmission bei anschließender Verbrennung dieses Gases weitgehend vermieden.By recovering the zinc and iron compounds, it is possible to further reduce the ash content of the residue after large iron particles have already been magnetically separated. At the same time, with the purification of H 2 S from the pyrolysis gas, SOr emissions during subsequent combustion of this gas are largely avoided.

ftis heute werden die teueren Zinkverbindungen (zum größten Teil nicht mehr ZnO, sondern ZnS) nicht gewonnen, obwohl sie bei einem erneuten Einsatz des Rückstandes als Füllstoff keine positiven Eigenschaften bewirken. - Auch bei der Herstellung von Aktivkohle aus diesem Rückstand wirken die Zinkverbindungen äußerst störend da sie leicht verdampfen. Zur Vermeidung von Umweltbelastungen sind daher besondere Vorkehrungen nötig.Today the expensive zinc compounds (for for the most part no longer ZnO, but ZnS) not gained, although it was used when the Residue as a filler does not have any positive properties. - Also in the production of activated carbon from this residue, the zinc compounds are extremely disruptive because they evaporate easily. To the Special precautions are therefore necessary to avoid environmental pollution.

Zusätzlich mit der Gewinnung der Zink- und Eisenverbindungen wird auch eine Reinigung der bei der Pyrolyse anfallenden Gase von H2S möglich, die heute nur durch aufwendige Verfahren durchgeführt werden kann. Dies erecheint aus Gründen des Umweltschutzes jedoch notwendig.In addition, with the extraction of the zinc and iron compounds, it is also possible to purify the gases from the pyrolysis of H 2 S, which today can only be carried out using complex processes. However, this appears necessary for reasons of environmental protection.

Der Kohlenstoff wird heute direkt als Füllstoff oder in der Farbenindustrie verwendet — Eine Aktivkohleherstellung aus dem Pyrolysekohlenstoff ist äußerst schwierig, da darin die Verunreinigungen wie z. B. die Zink- und Eisenverbindungen stören.Today the carbon is used directly as a filler or in the paint industry - an activated carbon production from the pyrolysis carbon is extremely difficult because it contains the impurities such. B. the Zinc and iron compounds interfere.

Das Verfahren der Erfindung stellt sich die Aufgabe, die Zink- und Eisenverbindungen mit Hilfe eines kostengünstigen Säurekreislaufes (z. B. Salzsäure) zu gewinnen und damit Verunreinigungen des Kohlenstoffs zu entfernen, wobei gleichzeitig die Befreiung des Pyrolysegases von H2S und somit die Verhinderung einer SOrEmission bei dessen Verbrennung möglich ist Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der gemahlene und von großen Eisenteilen befreite Pyrolyserückstand mit Säure wie z. B. Salzsäure versetzt wird, wobei die Zink- und Eisenverbindungen in Lösung gehen. Dieser Vorgang läßt sich durch Temperaturerhöhung beschleunigen.The process of the invention has the task of obtaining the zinc and iron compounds with the help of an inexpensive acid cycle (e.g. hydrochloric acid) and thus removing carbon impurities, while at the same time removing H 2 S from the pyrolysis gas and thus preventing it an SOrEmission in the combustion of which is possible. This object is achieved according to the invention that the ground and freed from large iron parts pyrolysis residue with acid such. B. hydrochloric acid is added, the zinc and iron compounds go into solution. This process can be accelerated by increasing the temperature.

Die dabei entstehenden Gase (im wesentlichen H2S) werden abgeleitet - Die unlöslichen Substanzen, vor allem der Kohlenstoff, sowie weitgehend aus SiO2 bestehende Verunreinigungen werden abfiltriert, ausgewaschen und getrocknetThe resulting gases (essentially H 2 S) are diverted - the insoluble substances, especially carbon, as well as impurities consisting largely of SiO 2 , are filtered off, washed out and dried

Durch NaOH-Zugabe wird der pH-Wert der Lösung auf ungefähr 6 erhöht und diese in einem Fällungsturm im Gegenstromprinzip von den beim Lösen entstandenen Gasen und vom H2S-haltigen Pyrolysegas durchströmt Dabei fallen vor allem Zink- und etwasThe pH value of the solution is increased to about 6 by adding NaOH and the gases formed during dissolution and the H 2 S-containing pyrolysis gas flow through it in a precipitation tower using the countercurrent principle

Eisensulfid aus (geringe Verunreinigungen), wobei dasIron sulfide from (minor impurities), whereby the Pyrolysegas weitgehendst von H2S gereinigt wird. DasPyrolysis gas is largely purified of H 2 S. That Pyrolysegas läßt sich ohne wesentliche SOrEmission zuPyrolysis gas can be used without significant emissions Heizzwecken verbrenneaBurn for heating purposes Die Fällung wird abfiltriert und läßt sich in einerThe precipitate is filtered off and can be in a

Zink(oxid)hütte auf Zinkoxid und Eisenschlacke aufarbeiten. Processing zinc (oxide) smelter for zinc oxide and iron slag.

Die Säure kann regeneriert und weiterverwendet werden.
Die mit der Erfindung erzielten Vorteile bestehen insbesondere in der wirtschaftlichen Aufarbeitung des bei der Altgummipyrolyse anfallenden Rückstandes zu aschearmem Ruß und Zinksulfid mit etwa Eisensulfid.The acid can be regenerated and reused.
The advantages achieved with the invention consist in particular in the economic processing of the residue obtained during the pyrolysis of old rubber to give low-ash soot and zinc sulfide with iron sulfide, for example.

Beispielexample Vergleich des Aschegehaltes einer ungereinigtenComparison of the ash content of an uncleaned one

mit einer gereinigten Probe Rückstand aus einerwith a purified sample residue from a

AltgummipyrolyseOld rubber pyrolysis

Probesample

UngereinigtUncleaned

GereinigtCleaned

AschegehaltAsh content

ca. 6,9%approx. 6.9%

ca. 1,13%approx. 1.13%

Diese Zahlen schwanken in Folge unterschiedlicher Verschmutzung und unterschiedlicher Reifenrezepte.These numbers fluctuate as a result of different levels of soiling and different tire recipes.

Durch Fällung der Lösung konnten ca. 6,86% Substanz gewonnen werden. Das entspricht einer Ausbringung von ca. 99,4%.By precipitating the solution, approx. 6.86% substance could be obtained. That corresponds to a Output of approx. 99.4%.

Die erfindungsgemäß erreichbare Aschearmut ist besonders bei einem Einsatz als Füll- bzw. Farbstoff sehr vorteilhaft, wobei gerade für die Herstellung von Aktivkohle die weitgehende Beseitigung der Zinkverbindungen sehr entscheidend istThe ash poverty that can be achieved according to the invention is particularly important when used as a filler or dye very advantageous, especially for the production of activated carbon, the extensive elimination of zinc compounds is very crucial

Gleichzeitig mit diesen Vorteilen wird das Pyrolysegas von H2S gereinigt und somit bei einer Verbrennung die Umweltbelastung durch eine SO2- Emission weitgehend vermieden.At the same time as these advantages, the pyrolysis gas is cleaned of H 2 S and thus the environmental pollution caused by SO 2 emissions in the event of combustion is largely avoided.

Claims (2)

Patentansprüche:Patent claims: 1. Verfahren zur Gewinnung von Zink- und Eisenverbindungen aus dem Rückstand einer AItgummipyrolyse, dadurch gekennzeichnet, daß der von großen Eisenteilen gereinigte und zerkleinerte Pyrolyserückstand mit einer Säure z. B. HCl versetzt wird, wobei die Zink- und Eisenverbindungen in Lösung gehen, während Kohlenstoff als unlöslicher Rückstand abfiltriert, gewaschen und getrocknet wird.1. Process for the production of zinc and iron compounds from the residue of an old rubber pyrolysis, characterized in that the pyrolysis residue cleaned of large iron parts and comminuted with an acid z. B. HCl is added, whereby the zinc and iron compounds go into solution, while carbon as insoluble residue is filtered off, washed and dried. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß aus dem Filtrat mittels einer Ausfällung durch entstandenes H2S und H2S aus dem Pyrolysegas nach einer Erhöhung des pH-Wertes Zink- und Eisensulfid gewonnen werden und dabei gleichzeitig das Pyrolysegas von H2S gereinigt wird.2. The method according to claim 1, characterized in that zinc and iron sulfide are obtained from the filtrate by means of a precipitation by H 2 S and H 2 S formed from the pyrolysis gas after an increase in the pH value and at the same time the pyrolysis gas is cleaned of H2S will.
DE2731862A 1977-07-14 1977-07-14 Process for the extraction of zinc and iron compounds from the residue of old rubber pyrolysis, especially of old tires Expired DE2731862C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2731862A DE2731862C2 (en) 1977-07-14 1977-07-14 Process for the extraction of zinc and iron compounds from the residue of old rubber pyrolysis, especially of old tires
GB10858/78A GB1599251A (en) 1977-07-14 1978-03-14 Process to win zinc and iron compounds from the residue of a scrap-rubber pyrolysis (especially from a pyrolysis of scrap tyres)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2731862A DE2731862C2 (en) 1977-07-14 1977-07-14 Process for the extraction of zinc and iron compounds from the residue of old rubber pyrolysis, especially of old tires

Publications (2)

Publication Number Publication Date
DE2731862B1 true DE2731862B1 (en) 1978-03-30
DE2731862C2 DE2731862C2 (en) 1979-01-04

Family

ID=6013949

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2731862A Expired DE2731862C2 (en) 1977-07-14 1977-07-14 Process for the extraction of zinc and iron compounds from the residue of old rubber pyrolysis, especially of old tires

Country Status (2)

Country Link
DE (1) DE2731862C2 (en)
GB (1) GB1599251A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0663370A4 (en) * 1992-05-27 1995-10-11 Jca Ltd Method of producing active carbon from waste tires.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115558796A (en) * 2022-11-04 2023-01-03 昆明理工大学 Method for resource extraction of zinc oxide from waste tire coupled blast furnace ash

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0663370A4 (en) * 1992-05-27 1995-10-11 Jca Ltd Method of producing active carbon from waste tires.

Also Published As

Publication number Publication date
GB1599251A (en) 1981-09-30
DE2731862C2 (en) 1979-01-04

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