US20100242682A1 - Method and system of dry processing of converter slag in copper smelting - Google Patents

Method and system of dry processing of converter slag in copper smelting Download PDF

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Publication number
US20100242682A1
US20100242682A1 US12/625,675 US62567509A US2010242682A1 US 20100242682 A1 US20100242682 A1 US 20100242682A1 US 62567509 A US62567509 A US 62567509A US 2010242682 A1 US2010242682 A1 US 2010242682A1
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United States
Prior art keywords
converter slag
furnace
slag
copper
reducing
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Abandoned
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US12/625,675
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English (en)
Inventor
Takafumi Sasaki
Takayoshi Fujii
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Pan Pacific Copper Co Ltd
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Pan Pacific Copper Co Ltd
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Publication date
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Assigned to PAN PACIFIC COPPER CO., LTD. reassignment PAN PACIFIC COPPER CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUJII, TAKAYOSHI, SASAKI, TAKAFUMI
Publication of US20100242682A1 publication Critical patent/US20100242682A1/en
Abandoned legal-status Critical Current

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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
    • C22B15/00—Obtaining copper
    • C22B15/0026—Pyrometallurgy
    • C22B15/0054—Slag, slime, speiss, or dross treating
    • 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
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/12—Dry methods smelting of sulfides or formation of mattes by gases
    • 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
    • C22B7/04—Working-up slag
    • 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 present invention relates to a method and a system of dry processing of slag discharged from a converter in copper smelting, and in particular, to a method and a system of dry processing of slag discharged from a converter in copper smelting, for transforming the slag into a raw material for iron making.
  • a general process of copper smelting is outlined below.
  • Raw material copper concentrate is oxidized in a flash furnace to form matte having a copper content of about 68% and flash furnace slag composed largely of iron oxide and silicic acid.
  • the matte and the slag are separated.
  • the matte is fed into a converter to form blister copper having a copper content of about 99% and converter slag composed primarily of iron oxide silicates.
  • the copper and the slag are separated.
  • the blister copper is cast into an anode having a higher copper purity.
  • the anode is electrolytically-refined to make electrolytic copper.
  • Nonpatent Document 1 slag beneficiation
  • Nonpatent Document 2 Journal of the Mining and Materials Processing Institute of Japan, 1997. 12, Vol. 113, Feature Issue on Recycling, p. 996, the last paragraph on the left column
  • Nonpatent Document 2 copper concentrate having a high copper content (about 25% Cu) and iron concentrate having a low copper content (about 0.6% Cu) are separated.
  • the slag copper concentrate can be reprocessed in a flash furnace, while the iron concentrate can be recycled as a raw material primarily for cement.
  • Japanese Unexamined Patent Application Publication No. 53-22115 discloses a method for processing slag to reduce copper oxide and Fe 3 O 4 contained in molten converter slag by blowing a solid reductant, such as coke and coal, a gas reductant, or a liquid reductant into the slag to produce copper-removed slag having a copper content of not more than 1% Cu and blister copper.
  • a solid reductant such as coke and coal, a gas reductant, or a liquid reductant
  • Nonpatent Document 3 The Caletones refinery of Codelco in Chile uses a practical method for recovering copper in slag by blowing pulverized coal into molten converter slag to reduce magnetite in the slag (Rolando Campos and Luis Torres, CALETONES SMELTER: TWO DECADES OF TECHNOLOGICAL IMPROVEMENTS, The Paul E. Queneau International symposium, Ontario, CANADA (1993) (hereinafter referred to as Nonpatent Document 3).
  • a new route for recycling converter slag is required, since the recent shrinking trend in the cement industry in Japan has created difficulty in finding firms receiving the iron concentrate produced through a slag beneficiation process, as described in Nonpatent Document 1. Since the converter slag contains about 50% by mass of iron, there is a possibility for the use as a raw material for iron-making. However, since the converter slag contains about 4% by mass of copper and about 2% by mass of zinc, the contents of copper and zinc are too high to use the slag as a raw material for iron making. Also iron concentrate produced through a slag beneficiation process contains about 0.6% by mass of copper and about 2.5% by mass of zinc, which may be too high to use the concentrate as a raw material for iron making.
  • the contents of not more than 0.3% by mass of copper and not more than 1% by mass of zinc may be desired for the use as a raw material for iron making.
  • converter slag processed by a method described in Nonpatent Document 2 or 3 also has high copper and zinc contents for use as a raw material for iron making, it may not be recommended for the use as a raw material for iron making.
  • An object of the present invention is to provide a method and system of processing of slag discharged from a converter in copper smelting for transforming the slag into a raw material for iron making.
  • the present inventors have discovered a method for processing slag to remove zinc through volatilization from the slag and to reduce copper oxide in a reducing furnace by a slag-fuming process used widely in zinc smelting and, subsequently, to separate the reduced blister copper from the slag by sedimentation in the reducing furnace or in a settling furnace arranged in series with the reducing furnace after the slag is transferred thereto.
  • the copper and zinc contents in the converter slag can be reduced to levels suitable for use as a raw material for iron making.
  • the converter slag can be continuously processed through the sedimentation separation in the settling furnace as a separate process, not in the reducing furnace.
  • molten slag is chemically reduced by heating, and then metals such as Zn, Pb and As are volatilized, for example, in a reducing furnace having a gas-blowing lance or a tuyere located in the lower portion of the furnace.
  • metals such as Zn, Pb and As
  • This process involves reduction and volatilization of metals in the slag by squirting a reductant (e.g. propane or heavy oil) and combustion air into the slag charged in the furnace.
  • a reductant e.g. propane or heavy oil
  • a slag-fuming process is commonly used in processing slag in zinc smelting, it has not been conventionally applied to processing of converter slag in copper smelting explained in the present invention and not been required either.
  • the feature of the present invention is, therefore, that a slag-fuming process is applied to processing of converter slag in copper smelting.
  • drained slag from a reducing furnace is transferred to a settling furnace and the reduced copper is separated by sedimentation and recovered there. In this case, continuous processing of converter slag is possible, which is very favorable to actual operation.
  • an aspect of the present invention provides a method for processing converter slag produced in copper smelting, encompassing feeding converter slag into a reducing furnace, reducing zinc and copper contained in the converter slag by heating and removing the reduced zinc through volatilization in the reducing furnace.
  • Another aspect of the present invention provides a method for processing converter slag produced in copper smelting, encompassing feeding converter slag into a reducing furnace, reducing zinc and copper contained in the converter slag by heating, removing the reduced zinc through volatilization, and separating the reduced copper from the slag by sedimentation in the reducing furnace.
  • a further aspect of the present invention provides a method for processing converter slag produced in copper smelting, encompassing feeding converter slag into a reducing furnace, reducing zinc and copper contained in the slag by heating, removing the reduced zinc through volatilization in the reducing furnace, subsequently transferring the reduced copper and the slag to a settling furnace from the reducing furnace, and separating the reduced copper from the slag by sedimentation in the settling furnace.
  • the method further encompasses crushing the slag after sedimentation separation of the reduced copper from the slag.
  • the method further encompasses reducing Fe 3 O 4 contained in the slag to FeO by heating in the reducing furnace.
  • the method further encompassing feeding the converter slag from a holding furnace into the reducing furnace, wherein the holding furnace retains the converter slag in a molten state and controls the feed rate of the converter slag to the reducing furnace.
  • a further aspect of the present invention provides a system for processing converter slag produced during copper smelting encompassing a reducing furnace that reduces zinc and copper contained in the converter slag by heating, discharging means configured to remove the volatile reduced zinc, the discharging means being provided in the reducing furnace, and draining means configured to drain the reduced copper separated by sedimentation from the reducing furnace.
  • the system further encompasses crushing means configured to crush the slag and transferring means configured to transfer the slag discharged from the reducing furnace to the crushing means.
  • Another aspect of the present invention provides a system for processing converter slag produced during copper smelting encompassing a reducing furnace configured to reduce zinc and copper contained in the converter slag by heating, discharging means configured to remove the volatile reduced zinc, the discharging means being provided in the reducing furnace, a settling furnace configured to separate the reduced copper by sedimentation, transfer means configured to transfer the slag discharged from the reducing furnace to the settling furnace, and draining means configured to drain the reduced copper separated by sedimentation from the settling furnace.
  • the system further includes crushing means configured to crush the slag and transferring means configured to transfer the slag discharged from the reducing furnace to the settling furnace.
  • the system further includes a holding furnace configured to maintain the converter slag in a molten state and configured to control a feed rate of the converter slag to the reducing furnace and transfer means configured to transfer the converter slag discharged from the holding furnace to the reducing furnace.
  • converter slag can be continuously transformed to slag containing copper and zinc in reduced amounts suitable for use as a raw material for iron making.
  • FIG. 1 shows an exemplary diagram of a system for continuous processing of converter slag of the invention.
  • FIG. 2 shows an exemplary diagram of a system for batch processing of converter slag of the invention.
  • slag discharged from a converter in copper smelting has a composition that contains 50 to 60% by mass of iron (primarily composed of Fe 3 O 4 and FeO), 20 to 25% by mass of silicon (primarily composed of SiO 2 ), 3 to 5% by mass of copper (primarily composed of CuS, Cu 2 O and CuO), 3 to 6% by mass of zinc (primarily composed of ZnO), 1 to 3% by mass of aluminum (primarily composed of Al 2 O 3 ).
  • the term “converter slag” used in the present invention refers to not only slag actually discharged from a converter in copper smelting but also slag having a similar composition to that of the converter slag in copper smelting.
  • slag in a flash furnace contains about 3 to 5% of Al 2 O 3 derived from a raw material ore and flux silicates ore.
  • the content of alumina (Al 2 O 3 ) is too high to use the slag as a raw material for iron making.
  • the present invention can be applied.
  • slag flowing into a receiving trough 1 from a converter (not shown) in a molten state at 1250 to 1330° C. is introduced into a holding furnace 2 while maintaining the molten state.
  • the slag may be introduced to the holding furnace 2 not in the molten state.
  • granular slag received in a hopper may be introduced to the holding furnace 2 .
  • the slag introduced to the holding furnace 2 is retained in the molten state.
  • the holding furnace 2 can control the feed rate of the slag to a reducing furnace 4 .
  • feeding the slag into the reducing furnace 4 at a constant flow rate contributes to stabilization of the continuous operation of the system for processing the slag.
  • the slag coming out of the holding furnace 2 passes through a slag trough 3 and is fed into the reducing furnace 4 .
  • the reducing furnace 4 zinc, copper and other metal constituents are reduced.
  • Nonlimiting examples of reductants include solid carbonaceous reductants such as coke and coal, gaseous reductants such as hydrogen and hydrocarbons (e.g. methane, ethane, propane, and butane), and liquid reductants such as petroleum and heavy oil. Typically, liquefied petroleum gas (LPG) can be used.
  • the reductant and combustion air are squirted into the slag in the furnace 4 by top blowing from the head of a lance 5 extending from the top of the reducing furnace 4 . Such blowing leads to intense agitation of the molten slag in the reducing furnace 4 , resulting in enhanced reaction efficiency of the slag and the reductant.
  • the head of the lance 5 may be immersed in the slag.
  • the reductant may be supplied using a tuyere located at the bottom of the furnace. Increasing the flow rate of the reductant to be introduced or the reduction time enhances the efficiency of the reduction reaction. In other words, the contents of zinc and copper in the slag can be reduced.
  • the reduced zinc is volatilized from the slag phase and is discharged from a chimney 6 as a slag-fuming material together with other volatile components or fine slag particles.
  • a bag filter 7 is installed in the flue to recover the zinc.
  • cooling water may be sprayed to the flue or a water-cooling tower (not shown) may be installed, for the purpose of decreasing the temperature of the exhaust gas.
  • the reduced zinc may be recovered as zinc oxide through oxidization by the air on the way to the chimney 6 .
  • lead is also contained in the slag-fuming dust.
  • the slag containing reduced copper is discharged from the reducing furnace 4 , passes through melt trough 8 , and is introduced to a settling furnace 9 in the molten state.
  • the reduced copper is separated thereat by sedimentation caused by a difference in specific gravity. Continuous operation can be achieved by sedimentation separation in the settling furnace 9 , not in the reducing furnace 4 . Increasing the time for the sedimentation separation enhances the efficiency of the sedimentation separation and reduces the content of copper in the slag. Conversely, the efficiency of copper recovery can be improved.
  • the reduced copper is drained from a blister copper trough 10 .
  • the reduced copper may contain 60 to 80% by mass of copper and be recycled into a converter.
  • the slag separated from the reduced copper passes through a slag trough 11 and is transferred to a slag-crushing unit 12 to be crushed into grains having sizes suitable for use.
  • the crushing unit include a water-granulation machine, a crusher, a mill, and a combination thereof.
  • the content of copper in the slag can be reduced to 0.3% by mass or less and the content of zinc to 1% by mass or less.
  • the slag processed according to the present invention can, therefore, be used as a raw material for iron making.
  • converter slag can be continuously processed. Consequently, a continuous run of the system enables the reduction reactions and removal of the reduced zinc by volatilization in the furnace, the sedimentation separation of the reduced copper in the settling furnace, and the crushing of the slag in the crushing unit to concurrently proceed.
  • slag flowing into a receiving trough 1 from a converter (not shown) in a molten state at 1250 to 1330° C. is introduced into a reducing furnace 4 while maintaining the molten state.
  • reducing furnace 4 zinc, copper, and other metal components are reduced.
  • the reductant suitable for use and the reduction reactions in the reducing furnace 4 are similar to those in the system for continuous processing.
  • the reduced zinc is recovered as in the system for continuous processing.
  • the reduced copper is separated by sedimentation in the reducing furnace 4 . After the sedimentation separation, the reduced copper is drained from a blister copper trough 10 . On the other hand, the slag separated from the reduced copper passes through a slag trough 11 and is transferred to a slag-crushing unit 12 to be crushed into grains having sizes suitable for use.
  • the processed slag can be used as a raw material for iron making.
  • a plurality of reducing furnaces may be arranged in parallel.
  • Table 2 shows calculated values of a continuous operation under predetermined conditions in the system shown in FIG. 1 , in view of the crucible test described above.
  • the simulated operational conditions are as follows.
US12/625,675 2009-03-31 2009-11-25 Method and system of dry processing of converter slag in copper smelting Abandoned US20100242682A1 (en)

Applications Claiming Priority (2)

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JP2009-088257 2009-03-31
JP2009088257A JP5049311B2 (ja) 2009-03-31 2009-03-31 銅製錬における転炉スラグの乾式処理方法及びシステム

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
WO2013156676A1 (en) * 2012-04-16 2013-10-24 Outotec Oyj Method for processing slags of non-ferrous metallurgy
CN104946899A (zh) * 2015-06-03 2015-09-30 青海西豫有色金属有限公司 一种边缘传动顶吹转炉—贫化沉降炉联合处理铅浮渣的方法
US20150307959A1 (en) * 2013-07-23 2015-10-29 Xiang Guang Copper Co., Ltd. Method and device for depleting copper smelting slag
CN110846511A (zh) * 2019-11-18 2020-02-28 济源豫光有色冶金设计研究院有限公司 一种锌浸出渣与石膏渣协同处理的方法
RU2719977C2 (ru) * 2015-04-03 2020-04-23 Металло Белджиум Улучшенный шлак от производства цветных металлов
WO2020077851A1 (zh) * 2018-10-17 2020-04-23 江西理工大学 一种对铜渣焙烧改性回收铁的方法
RU2741038C1 (ru) * 2017-06-14 2021-01-22 Чайна Энфай Инжиниринг Корпорейшн Способ и устройство для выплавки меди с комплексной переработкой шлака

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CN107326195A (zh) * 2017-06-14 2017-11-07 中国恩菲工程技术有限公司 短流程炼铜方法
CN107227410A (zh) * 2017-06-14 2017-10-03 中国恩菲工程技术有限公司 短流程炼铜系统
CN108330289B (zh) * 2017-12-20 2019-09-24 赤峰硕人海泰节能环保科技有限公司 一种火法炼铜炉渣的处理方法
CN108165755B (zh) * 2017-12-26 2019-09-27 中国恩菲工程技术有限公司 铜熔炼渣综合回收方法
CN108034832A (zh) * 2017-12-26 2018-05-15 中国恩菲工程技术有限公司 铜熔炼渣综合回收装置

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WO2007145384A1 (en) * 2006-06-14 2007-12-21 Ecomaister Co., Ltd. A method for stabilizing slag and novel materials produced thereby

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CN104302792A (zh) * 2012-04-16 2015-01-21 奥图泰(芬兰)公司 用于处理非铁冶炼的渣滓的方法
EP2839045A1 (en) * 2012-04-16 2015-02-25 Outotec (Finland) Oy Method for processing slags of non-ferrous metallurgy
WO2013156676A1 (en) * 2012-04-16 2013-10-24 Outotec Oyj Method for processing slags of non-ferrous metallurgy
EP2839045A4 (en) * 2012-04-16 2016-01-13 Outotec Finland Oy PROCESS FOR PROCESSING SLAG IN NON-STEEL METALLURGY
US9435005B2 (en) 2012-04-16 2016-09-06 Outotec (Finland) Oy Method for processing slags of non-ferrous metallurgy
EA026836B1 (ru) * 2012-04-16 2017-05-31 Оутотек (Финлэнд) Ой Способ обработки шлаков цветной металлургии
US20150307959A1 (en) * 2013-07-23 2015-10-29 Xiang Guang Copper Co., Ltd. Method and device for depleting copper smelting slag
US9903005B2 (en) * 2013-07-23 2018-02-27 Yanggu Xiangguang Copper Co., Ltd. Method and device for depleting copper smelting slag
RU2719977C2 (ru) * 2015-04-03 2020-04-23 Металло Белджиум Улучшенный шлак от производства цветных металлов
EP3277852B1 (en) 2015-04-03 2021-04-07 Metallo Belgium Improved slag from non-ferrous metal production
CN104946899A (zh) * 2015-06-03 2015-09-30 青海西豫有色金属有限公司 一种边缘传动顶吹转炉—贫化沉降炉联合处理铅浮渣的方法
RU2741038C1 (ru) * 2017-06-14 2021-01-22 Чайна Энфай Инжиниринг Корпорейшн Способ и устройство для выплавки меди с комплексной переработкой шлака
WO2020077851A1 (zh) * 2018-10-17 2020-04-23 江西理工大学 一种对铜渣焙烧改性回收铁的方法
CN110846511A (zh) * 2019-11-18 2020-02-28 济源豫光有色冶金设计研究院有限公司 一种锌浸出渣与石膏渣协同处理的方法

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CL2009002241A1 (es) 2010-07-23
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JP5049311B2 (ja) 2012-10-17

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Owner name: PAN PACIFIC COPPER CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SASAKI, TAKAFUMI;FUJII, TAKAYOSHI;REEL/FRAME:023841/0022

Effective date: 20091001

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION