WO2013079802A1 - An apparatus for treating off-gas including acid mist originating from a source that forms acid mist - Google Patents

An apparatus for treating off-gas including acid mist originating from a source that forms acid mist Download PDF

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Publication number
WO2013079802A1
WO2013079802A1 PCT/FI2012/051191 FI2012051191W WO2013079802A1 WO 2013079802 A1 WO2013079802 A1 WO 2013079802A1 FI 2012051191 W FI2012051191 W FI 2012051191W WO 2013079802 A1 WO2013079802 A1 WO 2013079802A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
acid mist
fan
scrubber
gas scrubber
Prior art date
Application number
PCT/FI2012/051191
Other languages
French (fr)
Inventor
Hannu Laitala
Original Assignee
Outotec Oyj
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 Outotec Oyj filed Critical Outotec Oyj
Priority to ATGM9023/2012U priority Critical patent/AT14303U1/en
Priority to ES201490007U priority patent/ES1114281Y/en
Priority to CN201290001024.3U priority patent/CN203960382U/en
Priority to DE212012000220.0U priority patent/DE212012000220U1/en
Priority to BR212014013220-3U priority patent/BR212014013220Y1/en
Priority to RU2014118343/02U priority patent/RU151127U1/en
Publication of WO2013079802A1 publication Critical patent/WO2013079802A1/en
Priority to ZA2014/04651A priority patent/ZA201404651B/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/06—Spray cleaning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
    • 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
    • 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
    • C25C1/12—Electrolytic production, recovery or refining of metals by electrolysis of solutions of copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2247/00—Details relating to the separation of dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D2247/12—Fan arrangements for providing forced draft

Definitions

  • the invention relates to an apparatus as defined in the preamble of claim 1.
  • the copper is leached using sulfuric acid to form a copper sulfate solution, from which solution the copper is electrowon by deposition to have copper metal.
  • electrolysis a lead anode and a cathode made of stainless steel are immersed in an electrolyte bath encompassing a copper sulfate / sulfuric acid so ⁇ lution. Electric current flows from the anode to the cathode, giving rise to an electro-chemical reaction, whereby the metallic copper is deposited on the sur ⁇ face of the cathode. At the same time, oxygen is re- leased on the surface of the anode.
  • Electrolytic cells 7 are normally covered by hoods 8 (see Fig. 1) which are used to collect the acid mist and lead it via the acid mist treatment apparatus to the atmosphere.
  • Fig. 1 schematically illustrates a typical known acid mist treatment apparatus.
  • the acid mist treatment ap ⁇ paratus includes a gas scrubber 1 operating on a wet- scrubbing principle and receiving the off-gas includ- ing acid mist sucked from electrowinning EW.
  • the gas scrubber 1 removes the acid mist from the gas.
  • a demister 2 is provided. From the demister 2, the gas is sucked by a fan 3 and led to a chimney 4 from which the cleaned gas exits to the ambient air.
  • the fan 3 provides a negative pressure to suck the gas through the gas scrubber 1 and the demister 2.
  • a choke valve 6 prior to the chimney 4.
  • the problem is that a fan placed after the gas scrub ⁇ ber in the flow direction of the gas operates as a sucking fan, whereby it does not operate in an optimal fashion and the gas flow may vary violently and very abruptly.
  • a choke valve has therefore been required, which increases investment costs.
  • the choke valve also has the effect of increasing the energy costs of the drive motor of the fan.
  • the fan also requires an ef ⁇ fective drive motor, which increases investment costs.
  • a further problem is that the gas scrubber operates under a negative pressure, whereby the negative pres ⁇ sure favors evaporation and thus impairs cleaning ef ⁇ ficiency of the gas scrubber.
  • the fan cannot be cleaned by water during use because the washing water would go directly out of the chimney. With the current system, in order to clean the fan it must be stopped for cleaning.
  • the objective of the invention is to remedy the de ⁇ fects referred to above.
  • the objective of the invention is to disclose an improved apparatus which is, in terms of investment and operating costs, more advantageous than the current apparatuses.
  • a further objective of the invention is to disclose an apparatus where the gas scrubber can operate under a slightly positive pressure.
  • Yet another objective of the invention is to disclose an apparatus where cleaning the fan with water during use is possible without stopping the fan.
  • the apparatus according to the invention is characterized by what has been presented in claim 1.
  • the fan is provided prior to the gas scrubber in the flow direction of the gas, whereby the gas scrubber operates under a slightly positive pressure.
  • the source that forms acid mist is electrowinning .
  • Other parts of pro ⁇ Deads can also produce acid mist.
  • the fan is provid ⁇ ed with a water spray cleaning device to clean the fan during use.
  • the gas scrubber is a wet gas scrubber bringing the gas to be cleaned into contact with a scrubbing solution.
  • the demister is cyclone-, lamellar- or mesh-type or any combination thereof .
  • the fan is a vari ⁇ able-speed fan.
  • Fig. 1 schematically illustrates a prior art acid mist treatment apparatus
  • Fig. 2 schematically illustrates one embodiment of the apparatus according to the invention.
  • Fig. 2 illustrates an apparatus for treating off-gas including acid mist produced in electrowinning EW.
  • the apparatus includes a gas scrubber 1 arranged to re ⁇ ceive the off-gas including acid mist to be cleaned from acid mist.
  • a fan 3 to provide a gas flow is dis ⁇ posed before the gas scrubber 1 in the flow direction of the gas, whereby the gas scrubber operates under a slightly positive pressure. Placing the fan 3 before the gas scrubber has the effect of the gas scrubber using less electrical energy because the unnecessary choke valve is taken out and the same scrubbing capac ⁇ ity is achieved with a smaller electric motor of the fan.
  • investment costs are reduced by 10% and operating costs by 20% relative to the corresponding known solution.
  • the gas flow through the gas scrubber is reduced because the gas scrubber operates on a slightly positive pressure in ⁇ stead of the slightly negative pressure of the solu ⁇ tion used in the prior art of Fig. 1.
  • the difference between the gas flow values rang ⁇ es from 10.5% (Om.a.s.l.) to 17% (3000m. a . s .1. ) , mean ⁇ ing investment costs reduced by 25%. Cleaning by wa ⁇ ter during use of the fan 3 is possible.
  • a system operating on a positive pressure favors condensation and thus improves the scrubbing capacity.
  • the gas scrubber is followed in the flow direction of the gas by a demister 2 to receive the gas from the gas scrub ⁇ ber and remove droplets from the gas.
  • the apparatus further includes a chimney 4 to carry the cleaned dry gas to the ambient airspace.
  • the fan 3 is provided with a water spray cleaning de ⁇ vice 5 to clean the fan during use.
  • the fan 3 may be a constant- or variable-speed fan.
  • the gas scrubber 1 is preferably a wet-type gas scrub ⁇ ber bringing the gas to be cleaned into contact with a scrubbing solution, such as water.
  • the demister 2 may be cyclone-, lamellar- or mesh-type or any combination thereof.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)
  • Separation Of Particles Using Liquids (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

An apparatus for treating off-gas including acid mist originating from a source that forms acid mist, the apparatus including a gas scrubber (1) which is arranged to receive off-gas to be cleaned from acid mist, a demister (2) which is provided after the gas scrubber in the flow direction of the gas to receive the gas from the gas scrubber and remove droplets from the gas, a fan (3) to provide a gas flow and a chimney (4) to carry the cleaned dry gas to the ambient air. The fan(3) is provided before the gas scrubber (1) in the flow direction of the gas, whereby the gas scrubber (1) operates under a slightly positive pressure.

Description

AN APPARATUS FOR TREATING OFF-GAS INCLUDING ACID MIST ORIGINATING FROM A SOURCE THAT FORMS ACID MIST
FIELD OF THE INVENTION
The invention relates to an apparatus as defined in the preamble of claim 1.
BACKGROUND OF THE INVENTION
In the recovery of metal, such as copper, from sul- fidic ores, the copper is leached using sulfuric acid to form a copper sulfate solution, from which solution the copper is electrowon by deposition to have copper metal. In electrolysis, a lead anode and a cathode made of stainless steel are immersed in an electrolyte bath encompassing a copper sulfate / sulfuric acid so¬ lution. Electric current flows from the anode to the cathode, giving rise to an electro-chemical reaction, whereby the metallic copper is deposited on the sur¬ face of the cathode. At the same time, oxygen is re- leased on the surface of the anode. The oxygen forms bubbles released from the anode and rising through the electrolyte. On the free surface of the electrolyte, the bubbles are broken and produce acid mist which is a fine mist of acid droplets in suspension in the air- space above the electrolyte. The acid mist induces a significant health hazard for users. Therefore, the electrowinning plants are equipped with an acid mist recovery and treatment apparatus. Electrolytic cells 7 are normally covered by hoods 8 (see Fig. 1) which are used to collect the acid mist and lead it via the acid mist treatment apparatus to the atmosphere. Fig. 1 schematically illustrates a typical known acid mist treatment apparatus. The acid mist treatment ap¬ paratus includes a gas scrubber 1 operating on a wet- scrubbing principle and receiving the off-gas includ- ing acid mist sucked from electrowinning EW. The gas scrubber 1 removes the acid mist from the gas. Follow¬ ing the gas scrubber 1 in the flow direction of the gas, a demister 2 is provided. From the demister 2, the gas is sucked by a fan 3 and led to a chimney 4 from which the cleaned gas exits to the ambient air. The fan 3 provides a negative pressure to suck the gas through the gas scrubber 1 and the demister 2. In addition, following the fan 3 in the flow direction of the gas there is provided a choke valve 6 prior to the chimney 4.
Such acid mist treatment apparatuses are known for ex¬ ample from publications WO 2009/025837 Al and article "Copper electrowinning in the absence of acid mist: six years of industrial application", Sabdiel Mella, Rodrigo Villarroel, Alejandro Lillo; SAME Ltda, Chile.
The problem is that a fan placed after the gas scrub¬ ber in the flow direction of the gas operates as a sucking fan, whereby it does not operate in an optimal fashion and the gas flow may vary violently and very abruptly. A choke valve has therefore been required, which increases investment costs. The choke valve also has the effect of increasing the energy costs of the drive motor of the fan. The fan also requires an ef¬ fective drive motor, which increases investment costs. A further problem is that the gas scrubber operates under a negative pressure, whereby the negative pres¬ sure favors evaporation and thus impairs cleaning ef¬ ficiency of the gas scrubber. In addition, the fan cannot be cleaned by water during use because the washing water would go directly out of the chimney. With the current system, in order to clean the fan it must be stopped for cleaning.
OBJECTIVE OF THE INVENTION
The objective of the invention is to remedy the de¬ fects referred to above.
In particular, the objective of the invention is to disclose an improved apparatus which is, in terms of investment and operating costs, more advantageous than the current apparatuses.
A further objective of the invention is to disclose an apparatus where the gas scrubber can operate under a slightly positive pressure.
Yet another objective of the invention is to disclose an apparatus where cleaning the fan with water during use is possible without stopping the fan.
SUMMARY OF THE INVENTION
The apparatus according to the invention is characterized by what has been presented in claim 1. According to the invention, the fan is provided prior to the gas scrubber in the flow direction of the gas, whereby the gas scrubber operates under a slightly positive pressure.
In one embodiment of the apparatus, the source that forms acid mist is electrowinning . Other parts of pro¬ cesses can also produce acid mist.
In one embodiment of the apparatus, the fan is provid¬ ed with a water spray cleaning device to clean the fan during use.
In one embodiment of the apparatus, the gas scrubber is a wet gas scrubber bringing the gas to be cleaned into contact with a scrubbing solution.
In one embodiment of the apparatus, the demister is cyclone-, lamellar- or mesh-type or any combination thereof . In one embodiment of the apparatus, the fan is a vari¬ able-speed fan.
LIST OF FIGURES
In the following section, the invention will be de- scribed in detail by means of exemplifying embodi¬ ments, with reference to the accompanying drawing in which
Fig. 1 schematically illustrates a prior art acid mist treatment apparatus, and Fig. 2 schematically illustrates one embodiment of the apparatus according to the invention.
DETAILED DESCRIPTION OF THE INVENTION
Fig. 2 illustrates an apparatus for treating off-gas including acid mist produced in electrowinning EW. The apparatus includes a gas scrubber 1 arranged to re¬ ceive the off-gas including acid mist to be cleaned from acid mist. A fan 3 to provide a gas flow is dis¬ posed before the gas scrubber 1 in the flow direction of the gas, whereby the gas scrubber operates under a slightly positive pressure. Placing the fan 3 before the gas scrubber has the effect of the gas scrubber using less electrical energy because the unnecessary choke valve is taken out and the same scrubbing capac¬ ity is achieved with a smaller electric motor of the fan. In one example embodiment, investment costs are reduced by 10% and operating costs by 20% relative to the corresponding known solution. The gas flow through the gas scrubber is reduced because the gas scrubber operates on a slightly positive pressure in¬ stead of the slightly negative pressure of the solu¬ tion used in the prior art of Fig. 1. In one embodi- ment, the difference between the gas flow values rang¬ es from 10.5% (Om.a.s.l.) to 17% (3000m. a . s .1. ) , mean¬ ing investment costs reduced by 25%. Cleaning by wa¬ ter during use of the fan 3 is possible. In one embod¬ iment, this means operating costs reduced by 15% com pared to the prior art. A system operating on a positive pressure (even on a slightly positive pressure) favors condensation and thus improves the scrubbing capacity. With further reference to Fig. 2, the gas scrubber is followed in the flow direction of the gas by a demister 2 to receive the gas from the gas scrub¬ ber and remove droplets from the gas. The apparatus further includes a chimney 4 to carry the cleaned dry gas to the ambient airspace.
The fan 3 is provided with a water spray cleaning de¬ vice 5 to clean the fan during use. The fan 3 may be a constant- or variable-speed fan.
The gas scrubber 1 is preferably a wet-type gas scrub¬ ber bringing the gas to be cleaned into contact with a scrubbing solution, such as water.
The demister 2 may be cyclone-, lamellar- or mesh-type or any combination thereof.
The invention is not limited merely to the examples of its embodiments referred to above; instead, many vari¬ ations are possible within the scope of the inventive idea defined by the claims.

Claims

1. An apparatus for treating off-gas including acid mist originating from a source that forms acid mist, the apparatus including
- a gas scrubber (1) arranged to receive off- gas to be cleaned from acid mist,
a demister (2) provided after the gas scrubber in the flow direction of the gas to receive the gas from the gas scrubber and remove droplets from the gas,
- a fan (3) to provide a gas flow, and
- a chimney (4) to carry the cleaned dry gas to the ambient air, c h a r a c t e r i z e d in that the fan (3) is provided before the gas scrubber (1) in the flow direction of the gas, whereby the gas scrubber (1) operates under a slightly positive pressure.
2. The apparatus according to claim 1, c h a r a c - t e r i z e d in that the source that forms acid mist is an electrowinning (EW) apparatus.
3. The apparatus according to claim 1 or 2, c h a r a c t e r i z e d in that the fan (3) is provided with a water spray cleaning device (5) to clean the fan during use.
4. The apparatus according to any one of claims 1 to 3, c h a r a c t e r i z e d in that the gas scrubber (1) is a wet gas scrubber bringing the gas to be cleaned into contact with a scrubbing solution.
5. The apparatus according to any one of claims 1 to
4, c h a r a c t e r i z e d in that the demister (2) is cyclone-, lamellar- or mesh-type or any combination thereof .
6. The apparatus according to any one of claims 1 to
5, c h a r a c t e r i z e d in that the fan (3) is a variable-speed fan.
PCT/FI2012/051191 2011-12-01 2012-11-30 An apparatus for treating off-gas including acid mist originating from a source that forms acid mist WO2013079802A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
ATGM9023/2012U AT14303U1 (en) 2011-12-01 2012-11-30 Apparatus for treating exhaust gases including an acid mist resulting from an acid fogging source
ES201490007U ES1114281Y (en) 2011-12-01 2012-11-30 An apparatus for the treatment of gaseous effluents that include acid mist that originates from a source that forms acid mist
CN201290001024.3U CN203960382U (en) 2011-12-01 2012-11-30 For the treatment of the device that is derived from waste gas source, that include acid mist that forms acid mist
DE212012000220.0U DE212012000220U1 (en) 2011-12-01 2012-11-30 Apparatus for treating exhaust gases which trap an acid mist resulting from a source of acid misting
BR212014013220-3U BR212014013220Y1 (en) 2011-12-01 2012-11-30 device for treating an exhaust gas, including acid mist from an acid mist source
RU2014118343/02U RU151127U1 (en) 2011-12-01 2012-11-30 WASTE GAS PROCESSING DEVICE
ZA2014/04651A ZA201404651B (en) 2011-12-01 2014-06-24 An apparatus for treating off-gas including acid mist originating from a source that forms acid mist

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FIU20114180 2011-12-01
FI20114180U FI9520U1 (en) 2011-12-01 2011-12-01 Plant for treating exhaust gas originating from a source which forms acid mist and contains acid mist

Publications (1)

Publication Number Publication Date
WO2013079802A1 true WO2013079802A1 (en) 2013-06-06

Family

ID=45560142

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2012/051191 WO2013079802A1 (en) 2011-12-01 2012-11-30 An apparatus for treating off-gas including acid mist originating from a source that forms acid mist

Country Status (10)

Country Link
CN (1) CN203960382U (en)
AT (1) AT14303U1 (en)
BR (1) BR212014013220Y1 (en)
DE (1) DE212012000220U1 (en)
ES (1) ES1114281Y (en)
FI (1) FI9520U1 (en)
PL (1) PL123121U1 (en)
RU (1) RU151127U1 (en)
WO (1) WO2013079802A1 (en)
ZA (1) ZA201404651B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019178707A1 (en) * 2018-03-22 2019-09-26 Vidaurre Heiremans Victor Eduardo Electrochemical reactor for processes for non-ferrous metal electrodeposition, which comprises a set of apparatuses for gently agitating an electrolyte, a set of apparatuses for containing and coalescing an acid mist, and a set of apparatuses for capturing and diluting acid mist aerosols remaining in the gas effluent of the reactor
CN111455415A (en) * 2020-04-07 2020-07-28 圣达电气有限公司 Anode slot air draft device of crude foil machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105655653B (en) * 2015-09-11 2018-06-26 安徽永恒动力科技有限公司 A kind of acid mist treatment device and its method for handling acid mist
CN106799101B (en) * 2017-02-20 2018-12-21 江苏熙成新材料科技有限公司 Inhale acid mist environmental protecting device in a kind of pickling tube air curtain side
CN107088341A (en) * 2017-05-19 2017-08-25 贾亮成 Air cleaning unit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040007477A1 (en) * 2002-07-09 2004-01-15 Hatch Ltd Recovery and re-use of anode oxygen from electrolytic cells
CN201147645Y (en) * 2007-11-30 2008-11-12 邹葳蕤 Intelligent temperature control acid mist condensation purifying equipment
CN101791516A (en) * 2010-04-06 2010-08-04 惠州益伸电子有限公司 Waste gas central treating system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009025837A1 (en) 2007-08-23 2009-02-26 Fernando Penna Wittig Lateral exhaust enclosure-aided mist control system in metal electrowinning and electrorefining cells

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040007477A1 (en) * 2002-07-09 2004-01-15 Hatch Ltd Recovery and re-use of anode oxygen from electrolytic cells
CN201147645Y (en) * 2007-11-30 2008-11-12 邹葳蕤 Intelligent temperature control acid mist condensation purifying equipment
CN101791516A (en) * 2010-04-06 2010-08-04 惠州益伸电子有限公司 Waste gas central treating system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019178707A1 (en) * 2018-03-22 2019-09-26 Vidaurre Heiremans Victor Eduardo Electrochemical reactor for processes for non-ferrous metal electrodeposition, which comprises a set of apparatuses for gently agitating an electrolyte, a set of apparatuses for containing and coalescing an acid mist, and a set of apparatuses for capturing and diluting acid mist aerosols remaining in the gas effluent of the reactor
CN111455415A (en) * 2020-04-07 2020-07-28 圣达电气有限公司 Anode slot air draft device of crude foil machine

Also Published As

Publication number Publication date
CN203960382U (en) 2014-11-26
BR212014013220U2 (en) 2018-06-05
AT14303U1 (en) 2015-08-15
PL123121U1 (en) 2015-07-20
BR212014013220Y1 (en) 2018-11-13
RU151127U1 (en) 2015-03-20
ES1114281Y (en) 2014-09-17
ZA201404651B (en) 2015-09-30
ES1114281U (en) 2014-06-27
DE212012000220U1 (en) 2014-07-11
FI9520U1 (en) 2012-01-11

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