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
  • 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
• • 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
  • C22B15/00—Obtaining copper
  • C22B15/0026—Pyrometallurgy
  • C22B15/0028—Smelting or converting
  • C22B15/0047—Smelting or converting flash smelting or converting
• • 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
• • 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 relates to a method defined in the preamble of claim 1 for treating the slag created in the production of blister copper.
• the thermal value of the concentrate is generally the lower, the higher is the copper content of the concentrate. With a high copper content, the share of iron sulfide minerals is low.
• a sufficiently high oxygen enrichment can be used, and as a result, the gas quantities can be kept moderate.
• a concentrate with a lower copper content is suited in the production of blister copper, if it has a low iron content, in which case the created slag quantity is not remarkably large.
• a two-step slag cleaning method includes either two electric furnaces or an electric furnace and a slag concentration plant. In the electric furnace, the slag is reduced by coke, so that the precious metals bound in the slag phase are reduced and separated as a distinctive copper phase underneath the slag layer. In case the slags are processed in a slag concentration plant, the slag concentrate can be fed back into the smelting reactor.
• the blister copper is conducted to be refined in an anode furnace.
• the iron content in the blister is still so high that there is often needed a separate treatment for the blister in a converter.
• One method is electric furnace pretreatment, where the created blister copper is processed together with bulk blister in an anode furnace, but there is still left so much copper in the slag that it must for economical reasons be recovered by concentration-technical means.
• the object of the invention is to introduce a new method for treating slag created in the production of blister copper produced directly of concentrate.
• a particular object of the invention is to achieve a more effective and more advantageous way, with respect to overall economy, for recovering the slagging copper in the production of blister copper.
• the invention is characterized by what is set forth in the characterizing part of claim 1.
• Other preferred embodiments of the invention are characterized by what is set forth in the rest of the claims.
• the method according to the invention has many advantages. According to the method, there is advantageously recovered the copper contained in the slag created in the production of blister copper that is produced directly of concentrate.
• the method of the invention simplifies the recovery of copper, and in addition, the method enables an improved control of impurities.
• the recovery of copper contained in hydrometallurgical slag reduces energy consumption in comparison with electric furnace reduction. In addition, gas and dust emissions are reduced in comparison with pyrometallurgical recovery.
• Figure 1 illustrates a method according to the invention for processing the slag, i.e. blister slag, created in the production of blister copper produced in a suspension smelting furnace, such as a flash smelting furnace, in order to recover the copper, in which case at least part of the slag is leached in at least one step.
• Copper concentrate, flux and oxygen enriched air are fed into smelting 1 in a suspension smelting furnace, such as a flash smelting furnace.
• Dried concentrate particles react swiftly in hot suspension with oxygen enriched air. Energy that is released in the reactions is utilized in the process.
• Part of the sulfur is oxidized into sulfur dioxide, and iron is oxidized into iron oxides, thus creating slag with the flux.
• the reaction products are settled on the bottom of the suspension smelting furnace creating two separate molten phases: blister copper and blister slag.
• the gases created in the process are conducted further, to be processed in a known fashion.
• the blister copper created in the suspension smelting furnace is conducted into anode furnace treatment 2, refined there in a known fashion and cast into copper anodes.
• the blister slag created in smelting 1 is tapped out of the suspension smelting furnace through the provided circulation channels, such as launders, and is further conducted to be treated in order to recover the copper contained in the blister slag.
• First the blister slag is transferred to granulation and grinding 3.
• Granulated blister slag is ground for example in wet grinding down to a given grain size in order to obtain more reactive surface.
• leaching 4 the metals contained in the blister slag are leached.
• the leaching 4 is carried out in oxidizing conditions with sulfuric acid, so that copper sulfate is created.
• the amount of added sulfuric acid is advantageously 500 - 900 grams per one kilo of slag.
• the leaching can also be carried out by an ammoniacal solution, a chloridic solution or as bacteria leaching.
• copper is separated in copper precipitation 5.
• copper is precipitated for example by hydroxide precipitation or sulfide precipitation.
• hydroxide precipitation copper is precipitated by limestone, and the created copper-bearing precipitate is conducted back to smelting 1.
• sulfide precipitation copper is precipitated by hydrogen sulfide, and the created copper-bearing precipitate is conducted back to smelting 1.
• Copper can also be recovered in liquid-liquid extraction and electrolysis as cathode copper.
• the total volume of water and added sulfuric acid was exactly one liter.
• the solution temperature was 90° C.
• the quantity of sulfuric acid (H 2 S0 4 ) that was added in the experiment was 806 g/1000 g slag.
• the weight of the final precipitate was 77.4 g and copper content 3.1 %, which means that the total copper yield in the solution was 96.3%.
• the experiment was repeated in similar conditions for slag that was, instead of slow cooling, granulated by water directly from the molten state, so that the obtained product was finely divided granule with a corresponding composition.
• the obtained total leaching yield for copper in similar conditions was 95.8%, which is of the same order as with slowly cooled slag, when the accuracy of the analysis is taken into account.
• copper was precipitated selectively by adjusting acidity, so that iron was precipitated in the first step and copper in the second step, and thus the non-desired iron could be separated from the copper.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Manufacturing & Machinery (AREA)
• Metallurgy (AREA)
• Environmental & Geological Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Processing Of Solid Wastes (AREA)
• Extraction Or Liquid Replacement (AREA)
• Water Treatment By Electricity Or Magnetism (AREA)
• Electrolytic Production Of Metals (AREA)

Applications Claiming Priority (3)

Publications (1)

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• 2002
  • 2002-12-05 FI FI20022150A patent/FI115638B/fi not_active IP Right Cessation
• 2003
  • 2003-11-24 EP EP20030775423 patent/EP1579017A1/en not_active Withdrawn
  • 2003-11-24 US US10/536,631 patent/US20060037435A1/en not_active Abandoned
  • 2003-11-24 BR BR0317061A patent/BR0317061A/pt not_active IP Right Cessation
  • 2003-11-24 JP JP2004556365A patent/JP2006509103A/ja not_active Abandoned
  • 2003-11-24 AU AU2003283455A patent/AU2003283455A1/en not_active Abandoned
  • 2003-11-24 PL PL37693203A patent/PL376932A1/pl not_active Application Discontinuation
  • 2003-11-24 KR KR1020057010244A patent/KR20050085402A/ko not_active Application Discontinuation
  • 2003-11-24 MX MXPA05005997A patent/MXPA05005997A/es unknown
  • 2003-11-24 EA EA200500756A patent/EA200500756A1/ru unknown
  • 2003-11-24 WO PCT/FI2003/000898 patent/WO2004050925A1/en not_active Application Discontinuation
  • 2003-11-24 CN CNA2003801049585A patent/CN1720342A/zh active Pending
  • 2003-12-02 PE PE2003001224A patent/PE20040630A1/es not_active Application Discontinuation
  • 2003-12-04 AR ARP030104479 patent/AR042301A1/es not_active Application Discontinuation

Non-Patent Citations (1)

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