EP1368503A2 - Procede pour augmenter le residu sec dans de la poussiere de recuperation separee par cyclone - Google Patents

Procede pour augmenter le residu sec dans de la poussiere de recuperation separee par cyclone

Info

Publication number
EP1368503A2
EP1368503A2 EP02727201A EP02727201A EP1368503A2 EP 1368503 A2 EP1368503 A2 EP 1368503A2 EP 02727201 A EP02727201 A EP 02727201A EP 02727201 A EP02727201 A EP 02727201A EP 1368503 A2 EP1368503 A2 EP 1368503A2
Authority
EP
European Patent Office
Prior art keywords
flocculant
sludge
cyclone dust
promoted
dry residue
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.)
Withdrawn
Application number
EP02727201A
Other languages
German (de)
English (en)
Inventor
Hans-Jörg BONATH
Georg Bombeck
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.)
Kronos Titan GmbH
Original Assignee
Kronos Titan GmbH
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 Kronos Titan GmbH filed Critical Kronos Titan GmbH
Publication of EP1368503A2 publication Critical patent/EP1368503A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
    • A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
    • A62D3/33—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by chemical fixing the harmful substance, e.g. by chelation or complexation
    • 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
    • C22B34/00—Obtaining refractory metals
    • C22B34/10—Obtaining titanium, zirconium or hafnium
    • C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
    • C22B34/1218—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 obtaining titanium or titanium compounds from ores or scrap by dry processes
    • C22B34/1222—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 obtaining titanium or titanium compounds from ores or scrap by dry processes using a halogen containing agent
    • 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
    • C22B7/008—Wet processes by an alkaline or ammoniacal leaching
    • 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
    • C22B7/02—Working-up flue dust
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
    • A62D2101/40—Inorganic substances
    • A62D2101/43—Inorganic substances containing heavy metals, in the bonded or free state
    • 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

Definitions

  • the invention is directed to a process for the landfill-based work-up of heavy metal chlorides which accumulate as cyclone dust in the titanium dioxide production according to the chloride process, in which firstly insoluble constituents are separated from the cyclone dust which has been exposed to water or acids, then the pH of the solution by addition a neutralizing agent is raised in the pH range of 9 - 12, the heavy metals precipitate out as hydroxides, the hydroxides are thickened as sludge and are further dewatered.
  • the object of the invention is a process for the economical, large-scale processing of heavy metal chlorides which are obtained in the titanium ore chlorination, in particular regardless of the raw material used from the cyclone dust after removal of the inert components, a landfill product with a dry residue over 40%.
  • Floc is produced, which can be achieved by one - or preferably by a combination - of the following process improvements:
  • Thicken a (preferably anionic) flocculant mixed in Thicken a (preferably anionic) flocculant mixed in.
  • a (preferably cationic)
  • the filter pressure is preferably above 4 bar and the after-pressing pressure is above 10 bar.
  • the figure shows a process diagram for processing cyclone dust.
  • the volatile metal chlorides (1) formed in the chlorination reactor are cooled to such an extent that, apart from titanium tetrachloride, all are condensed together with the inert constituents - predominantly unreacted ore and coke particles - in a cyclone (2).
  • the titanium tetrachloride (3) which is still gaseous at this temperature, is then condensed (not shown here) and the remaining chlorination gases are passed to an exhaust gas cleaning system.
  • the solid mixture separated in the cyclone is referred to as cyclone dust (4).
  • a method according to the invention is outlined, with which none of the heavy metals present in the solution (10) is to be selectively recovered; all heavy metal ions are to be deposited as a substance which is no longer usable. They are converted into metal hydroxides by neutralization. It would be entirely possible to selectively separate individual ions or ion groups (for example iron or vanadium) at this point and to reprocess them. Such known process steps do not disturb and change the process according to the invention and are therefore not discussed further.
  • the neutralization is divided into two stages: a "quick" pre-neutralization and a readjustment.
  • the quick pre-neutralization takes place in a stirred (11) small premix tank (12) , whereby a rapid and above all spatially and temporally even increase in the pH value is achieved, and so there are no partial volumes even with fluctuations in the operational sequence, where the nucleation and floc formation are not optimal in terms of space and time.
  • the pH value increases in the pre-neutralization to 6 - 9.
  • a second (larger) neutralization tank (13) is provided, the suspension (14) emerging there has a uniform pH value between 9 - 12, preferably around 10.
  • the neutralization is preferably carried out with milk of lime (15) from a container (16.)
  • a pH value control (17) is indicated.
  • Filterability can be influenced favorably:
  • a first flocculant (22), preferably an anionic flocculant, can be added before the settling tank (18).
  • anionic flocculant preferably an anionic flocculant
  • Flocculants come, for example, copolymers of acrylamide and
  • the preferred amount is in the range 5-30 ppm, based on the total suspension amount.
  • a second flocculant (23), preferably a cationic flocculant, can also be added after thickening (18).
  • Cationic flocculants are, for example, cationic
  • the preferred amount is in the range 5-30 ppm, based on the thickened amount of sludge.
  • the drainage which is preferably carried out with a membrane filter press (21), also has an influence on the dry residue of the filter cake (26) to be deposited.
  • the folding pressure should be greater than 4 bar, preferably 10-15 bar.
  • the sludge is preferably repressed at 10-15 bar.
  • the dry residue in the filter cake can be increased to over 45%. This value is achieved regardless of the raw material used. It has been shown in the processes presented that both natural and artificial rutile as ore to be chlorinated produces a landfill-capable, non-thixotropic filter cake. With llmenite or with slag / rutile mixtures as a starting material with or without selective The advantage of working up the iron chloride lies solely in the high dry matter content of the filter cake, which is created when the metal chlorides are neutralized and worked up.
  • the filter cake is not thixotropic, the dry residue reaches 46.5%, the amount to be deposited is 1115 kg per t TiO 2 .
  • the filter cake is thixotropic (not suitable for landfill), the dry residue only reaches 26.9%, the amount to be deposited is 1270 kg per t TiO 2 .
  • the filter cake is not thixotropic, the dry residue is 38.6%, and the amount to be deposited is 627 kg per t TiO 2 .
  • a non-thixotropic filter cake with a 45% dry residue is obtained with the process according to the invention.
  • the amount to be deposited is now only 538 kg per t TiO 2 .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Toxicology (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Management (AREA)
  • Business, Economics & Management (AREA)
  • Treatment Of Sludge (AREA)
  • Processing Of Solid Wastes (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

Lors de la récupération de poussière séparée par cyclone, produite dans le cadre de la chloration de minerai de titane, on obtient un gâteau de filtre capable de se déposer, qui présente un résidu sec de plus de 40 % (sans fractions inertes servant de supports), que la matière première utilisée soit de l'ilménite, des scories, du rutile naturel ou synthétique ou des mélanges de ces derniers, si une des étapes suivantes ou une combinaison des étapes suivantes est mise en oeuvre : avant d'élever le pH à 9 - 12, un étage de neutralisation rapide est monté en amont, ce qui permet de respecter les mêmes conditions de précipitation pour tous les éléments volumiques du liquide, à un pH de 6 - 9; avant l'épaississement, un adjuvant de floculation (de préférence anionique) est ajouté; après l'épaississement, un adjuvant de floculation (de préférence cationique) est mélangé à la boue. Toutes ces mesures permettent d'améliorer la floculation et de rendre la récupération plus économique.
EP02727201A 2001-03-13 2002-03-08 Procede pour augmenter le residu sec dans de la poussiere de recuperation separee par cyclone Withdrawn EP1368503A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2001111895 DE10111895A1 (de) 2001-03-13 2001-03-13 Verfahren zur Erhöhung des Trockenrückstandes bei aufgearbeitetem Zyklonstaub
DE10111895 2001-03-13
PCT/DE2002/000844 WO2002072205A2 (fr) 2001-03-13 2002-03-08 Procede pour augmenter le residu sec dans de la poussiere de recuperation separee par cyclone

Publications (1)

Publication Number Publication Date
EP1368503A2 true EP1368503A2 (fr) 2003-12-10

Family

ID=7677194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02727201A Withdrawn EP1368503A2 (fr) 2001-03-13 2002-03-08 Procede pour augmenter le residu sec dans de la poussiere de recuperation separee par cyclone

Country Status (8)

Country Link
US (1) US20040136889A1 (fr)
EP (1) EP1368503A2 (fr)
JP (1) JP2004528162A (fr)
CA (1) CA2438311A1 (fr)
DE (1) DE10111895A1 (fr)
MX (1) MXPA03007247A (fr)
TW (1) TWI243697B (fr)
WO (1) WO2002072205A2 (fr)

Families Citing this family (13)

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RU2258752C2 (ru) * 2003-11-04 2005-08-20 ООО Научно-производственная экологическая фирма "ЭКО-технология" Способ комплексной переработки металлургических отходов
GB0405493D0 (en) * 2004-03-12 2004-04-21 Ciba Spec Chem Water Treat Ltd Dewatering process
WO2006111164A1 (fr) * 2005-04-18 2006-10-26 Jan Procida Méthode de production sous une forme pure de sels halogénés de métaux alcalins et/ou alcalino-terreux obtenus par traitement hydrolytique de déchets organiques halogénés
US7943103B2 (en) * 2006-04-27 2011-05-17 Tronox Llc Waste solids handling
JP4811728B2 (ja) * 2006-11-02 2011-11-09 清水建設株式会社 スラリー脱水処理方法および装置、ならびに懸濁液処理システム
DE102011106864B4 (de) * 2011-06-28 2013-06-20 Kronos International, Inc. Verfahren zur selektiven Abtrennung von Vanadium aus Rückständen der Titandioxidherstellung (Chloridverfahren)
JP2016510255A (ja) * 2013-01-07 2016-04-07 サハトレーベン・ヒェミー・ゲーエムベーハー チタン含有骨材、その製造方法及びその使用
AU2017268041B2 (en) * 2016-05-19 2021-11-04 Iluka Resources Limited Agglomeration of fines of titanium bearing materials
CN108569797A (zh) * 2017-03-07 2018-09-25 夏燕 一种处理磷矿废水的装置
CN115427164A (zh) 2020-06-16 2022-12-02 雅苒国际集团 使用絮凝剂从含磷酸组合物中去除重金属的方法
ES2982053T3 (es) 2020-06-16 2024-10-14 Yara Int Asa Procedimiento para la eliminación de metales pesados de una composición que contiene ácido fosfórico usando un tensioactivo polimérico iónico y uso de dicho tensioactivo en la precipitación de metales pesados en una composición que contiene ácido fosfórico
CA3180189A1 (fr) 2020-06-16 2021-12-23 Yara International Asa Procede d'elimination de metaux lourds d'une composition contenant de l'acide phosphorique
EP3925710A1 (fr) 2020-06-16 2021-12-22 Yara International ASA Procédé de traitement de compositions dangereuses solides contenant des métaux lourds

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US3655344A (en) * 1969-09-02 1972-04-11 Ppg Industries Inc Treatment of titanium tetrachloride drier residue
RO81184A2 (fr) * 1980-10-24 1983-02-01 Institutul De Cercetari Si Proiectari Pentru Epurarea Apelor Reziduale,Ro Procede de recuperation du zinc de l'eaux residuaires
DE3305802A1 (de) * 1983-02-19 1984-08-23 Philipp Müller, Nachf. Eugen Bucher GmbH & Co., 7000 Stuttgart Abwasseraufbereitungsverfahren
JPH0742118B2 (ja) * 1987-12-10 1995-05-10 日本鋼管株式会社 第一鉄イオン含有酸溶液の精製方法
GB8907163D0 (en) * 1989-03-30 1989-05-10 Shell Int Research A process of treating metal chloride wastes
US5238579A (en) * 1990-09-12 1993-08-24 Falconbridge Limited Method for generating coarse precipitates from solutions or slurries containing ionic species
US5976383A (en) * 1991-04-08 1999-11-02 Romar Technologies, Inc. Recycle process for removing dissolved heavy metals from water with aluminum particles
DE4131577C2 (de) * 1991-09-23 1999-11-25 Kronos Titan Gmbh Verfahren zur Erzeugung deponiefähiger Produkte aus Metallchloriden ohne inerte Anteile
DE4132679C2 (de) * 1991-10-01 2000-10-05 Kronos Titan Gmbh & Co Ohg Entfernung von Schwermetallen aus Abwässern der Titandioxidindustrie
DE4321168A1 (de) * 1992-07-22 1994-01-27 Kronos Titan Gmbh Verfahren zur Herstellung einer Titandioxidsuspension mit einem hohen Feststoffgehalt
US5393510A (en) * 1992-07-22 1995-02-28 Rheox, Inc. High solids content titanium dioxide suspension
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Also Published As

Publication number Publication date
CA2438311A1 (fr) 2002-09-19
WO2002072205A2 (fr) 2002-09-19
MXPA03007247A (es) 2003-12-04
DE10111895A1 (de) 2002-09-19
JP2004528162A (ja) 2004-09-16
WO2002072205A3 (fr) 2003-04-17
US20040136889A1 (en) 2004-07-15
TWI243697B (en) 2005-11-21

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