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EP0283785B1 - Verfahren zur Abscheidung von Quecksilber mittels Elektrolyse - Google Patents

Verfahren zur Abscheidung von Quecksilber mittels Elektrolyse Download PDF

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Publication number
EP0283785B1
EP0283785B1 EP88103269A EP88103269A EP0283785B1 EP 0283785 B1 EP0283785 B1 EP 0283785B1 EP 88103269 A EP88103269 A EP 88103269A EP 88103269 A EP88103269 A EP 88103269A EP 0283785 B1 EP0283785 B1 EP 0283785B1
Authority
EP
European Patent Office
Prior art keywords
electrolysis
mercury
chloride
chlorine
electrolyte
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 - Lifetime
Application number
EP88103269A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0283785A1 (de
Inventor
W. Dipl.-Ing. Dietz
F. Chem.-Ing. Kuhn
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.)
Deutsche Carbone AG
Original Assignee
Deutsche Carbone AG
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 Deutsche Carbone AG filed Critical Deutsche Carbone AG
Priority to AT88103269T priority Critical patent/ATE76450T1/de
Publication of EP0283785A1 publication Critical patent/EP0283785A1/de
Application granted granted Critical
Publication of EP0283785B1 publication Critical patent/EP0283785B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
    • C25C7/02—Electrodes; Connections thereof
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
    • C25C1/16—Electrolytic production, recovery or refining of metals by electrolysis of solutions of zinc, cadmium or mercury

Definitions

  • the invention relates to a method for the deposition of metallic mercury from an electrolyte by means of electrolysis, wherein the mercury-I-chloride (Hg2Cl2) in suspension-containing electrolyte reacts with chlorine, which the mercury-I-chloride to soluble mercury-II-chloride (HgCl2 ) oxidized, which is reduced cathodically to liquid mercury by electrolysis under the influence of chlorine at the anode.
  • Hg2Cl2 mercury-I-chloride
  • HgCl2 soluble mercury-II-chloride
  • the process according to the invention is advantageously used whenever mercury-I chloride present as a suspension is to be separated off and recovered as metallic mercury.
  • Mercury-I-chloride for example, often occurs during the purification of gases, which is obtained in a reactor with a solution of mercury-II-chloride.
  • the invention avoids these disadvantages. It is based on the object of proposing a method for the deposition of metallic mercury from an electrolyte by means of electrolysis with the features mentioned at the outset, which is distinguished by a noticeably simplified procedure, combined with a noticeably increased yield of deposited metallic mercury.
  • the invention is characterized in that by using an electrolysis cell in which the chlorine developed during oxidation at the anode can migrate unhindered into the cathode region of the cell, the chlorine formed in the electrolysis cell during electrolysis in situ for the oxidation the mercury-I chloride contained in the electrolyte as a suspension is used to form soluble mercury-II chloride.
  • the separate conduction of the chlorine gas evolving during electrolysis to the oxidation reactor is therefore dispensed with. Rather, the oxidation and the electrolysis are carried out in one and the same electrolysis cell, so that the chlorine gas generated during the electrolysis can also migrate directly and unhindered into the cathode region of the cell.
  • the gaseous chlorine formed in the electrolysis is therefore generally dissolved in the electrolyte and transported with the electrolyte, possibly supported by a pump or the like. The entire volume of the electrolyte is thus available for the oxidation of the mercury I chloride to mercury II chloride by means of the (gaseous or dissolved) chlorine.
  • a fixed bed electrolysis cell is preferably used for the process described, without a separate anolyte circuit and with a diaphragm which prevents direct contact with the counterelectrode but does not hinder the mass transfer. It has become known in a basic embodiment by the German patent specification 26 22 497 and in an improved embodiment by the applicant's DE-PS 29 04 539. A further improved embodiment describes the applicant's DE-PS 35 32 573. All of these embodiments can be used for carrying out the method according to the invention.
  • the process according to the invention is carried out in such a way that the electrolyte is used at least initially in such a concentration of mercury-I chloride and / or that the electrolysis voltage and thus the electrolysis current are used at least initially at such a level that metallic mercury is used deposits on the cathode and drips from there. It can then be withdrawn from the bottom of the electrolytic cell.
  • Iron, silver, nickel, copper, cadmium, aluminum, zinc, tin or an alloy of these metals is particularly suitable as the material for the cathode.
  • the inventive method is based on the theory that at the anode of the electrolysis device Cl ⁇ in Cl2 passes.
  • the Cl2 reacts with the Hg2Cl2 in suspension form and gives 2HgCl2, which is dissolved in the electrolyte.
  • the HgCl2 is reduced to Hg o + 2Cl ⁇ . This Cl ⁇ is then available for the oxidation of the cathode.
  • the electrolyte used had the following composition: 45 g / l Hg2Cl2 as a suspension 30 g / l sulfuric acid 10 g / l chloride.
  • the anodic current density was 300 A / m2. It was expanded metal, so that this value relates to the entire area including the gaps.
  • the cathodic current density was also 300 A / m2.
  • the initial content of water-insoluble Hg2Cl2 was equal to the above-mentioned concentration of the suspension of 45 g / l.
  • the initial current density was 600 A / m2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)
EP88103269A 1987-03-21 1988-03-03 Verfahren zur Abscheidung von Quecksilber mittels Elektrolyse Expired - Lifetime EP0283785B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88103269T ATE76450T1 (de) 1987-03-21 1988-03-03 Verfahren zur abscheidung von quecksilber mittels elektrolyse.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873709359 DE3709359A1 (de) 1987-03-21 1987-03-21 Verfahren zur abscheidung von quecksilber mittels elektrolyse
DE3709359 1987-03-21

Publications (2)

Publication Number Publication Date
EP0283785A1 EP0283785A1 (de) 1988-09-28
EP0283785B1 true EP0283785B1 (de) 1992-05-20

Family

ID=6323699

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88103269A Expired - Lifetime EP0283785B1 (de) 1987-03-21 1988-03-03 Verfahren zur Abscheidung von Quecksilber mittels Elektrolyse

Country Status (10)

Country Link
EP (1) EP0283785B1 (xx)
JP (1) JPS63266085A (xx)
KR (1) KR880011373A (xx)
AT (1) ATE76450T1 (xx)
CA (1) CA1317560C (xx)
DE (2) DE3709359A1 (xx)
ES (1) ES2031941T3 (xx)
GR (1) GR3005241T3 (xx)
IN (1) IN168897B (xx)
PT (1) PT87018B (xx)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5226545A (en) * 1992-10-19 1993-07-13 General Electric Company Extraction of mercury and mercury compounds from contaminated material and solutions

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT11882B (xx) * 1901-12-24 1903-05-11 Siemens Ag
CA931110A (en) * 1969-03-11 1973-07-31 A. Carlson Gordon Recovery of metals from solution
DD160806A1 (de) * 1980-08-01 1984-03-14 Buna Chem Werke Veb Verfahren zur aufarbeitung quecksilberhaltiger aktivkohlen
NO157543C (no) * 1984-10-19 1988-04-06 Norzink As Fremgangsmaate ved rensing av kvikksoelvholdige gasser og samtidig gjenvinning av kvikksoelvet i metallisk form.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, Band 79, Nr. 26, 31. Dezember 1973, Columbus, Ohio, USA T.TAURA et al.; "Removing mercury from gas" Seite 70, Spalte 2, Zusammen- fassung Nr. 147 804e & Japan. 73-17 690 *

Also Published As

Publication number Publication date
IN168897B (xx) 1991-07-06
ATE76450T1 (de) 1992-06-15
ES2031941T3 (es) 1993-01-01
EP0283785A1 (de) 1988-09-28
CA1317560C (en) 1993-05-11
PT87018A (pt) 1988-04-01
DE3709359A1 (de) 1988-09-29
KR880011373A (ko) 1988-10-28
GR3005241T3 (xx) 1993-05-24
DE3871202D1 (de) 1992-06-25
JPS63266085A (ja) 1988-11-02
PT87018B (pt) 1992-06-30

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