AU2015415628A1 - Eco-friendly zinc smelting method - Google Patents

Eco-friendly zinc smelting method Download PDF

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Publication number
AU2015415628A1
AU2015415628A1 AU2015415628A AU2015415628A AU2015415628A1 AU 2015415628 A1 AU2015415628 A1 AU 2015415628A1 AU 2015415628 A AU2015415628 A AU 2015415628A AU 2015415628 A AU2015415628 A AU 2015415628A AU 2015415628 A1 AU2015415628 A1 AU 2015415628A1
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AU
Australia
Prior art keywords
zinc
metal
fuming
sulfite
sulfuric acid
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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.)
Abandoned
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AU2015415628A
Inventor
Chang Young Choi
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Young Poong Corp
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Young Poong Corp
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Publication date
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Publication of AU2015415628A1 publication Critical patent/AU2015415628A1/en
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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
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • 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
    • C22B19/00—Obtaining zinc or zinc oxide
    • 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
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/32—Refining zinc
    • 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
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
    • C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
    • C22B3/08—Sulfuric acid, other sulfurated acids or salts thereof
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention relates to an eco-friendly zinc smelting method, and provides a method for treating zinc ferrite, the method comprising the steps of: generating a fumed metal oxide, sulfite offgas, and eco-friendly clean slag through a fuming process of zinc ferrite generated from a zinc wet smelting process; reacting the fumed metal oxide with the sulfite offgas generated from the fuming step to convert the same into a solid of a metal-sulfate compound and/or metal-sulfite compound; and reacting the metal sulfite compound with sulfuric acid to decompose the same into a metal sulfate compound and a concentrated sulfite gas.

Description

The present invention relates to an eco-friendly zinc smelting method, and provides a method for treating zinc ferrite, the method comprising the steps of: generating a fumed metal oxide, sulfite offgas, and eco-friendly clean slag through a fuming pro cess of zinc ferrite generated from a zinc wet smelting process; reacting the fumed metal oxide with the sulfite offgas generated from the fuming step to convert the same into a solid of a metal-sulfate compound and/or metal-sulfite compound; and reacting the metal sulfite compound with sulfuric acid to decompose the same into a metal sulfate compound and a concentrated sulfite gas.
(57) .S.SM:
7]|^] wo 2017/090784 Al lllllllllllllllllllllllllllllllllllll^ ///// //// /// // /00,0/0/ // //// /// <0/////(Zinc Ferrite)# //(Fuming) /00 0/ 0/ // /00,/// //X / Z/W/0/21> ////0 //; 0 /7] 0/ /0 /00/ /7] //(Fuming) //// ///0 00/ /00# /0//, 0/0/ 00 0/ //0 0/00 00 00/ 0 00(Metal-Sulfate or Sulfite)# /0//0 //; 0 /7] 00 00/ 000(Metal Sulfite)# 0/0 /0// /0 0 /000 0 00 00/ 000 //(Decomposition)// //;# 00/0 0////0/ 7]/ /00 /0/0.
TITLE OF THE INVENTION
ECO-FRIENDLY ZINC SMELTING METHOD
BACKGROUND OF THE INVENTION (a) Field of the Invention
The present disclosure relates to an eco-friendly method for processing a zinc ferrite generated during a zinc refining process.
(b) Description of the Related Art
Methods for extracting zinc from a zinc concentrate include a dry 10 refining method and a wet refining method. The wet refining method includes roasting a zinc concentrate, leaching the same, performing a purification process, and extracting highly pure zinc through an electrolysis process.
Regarding the wet refining method, a zinc ferrite is generated in the roasting process, and this material is not easily leached in a neutral leaching is and/or weak acidic leaching process, a conventional two-step leaching method.
Therefore, most zinc refiners increase the recovery of zinc through a strong acidic leaching process so as to further leach zinc in the zinc ferrite.
ZnOFe2O3 + 4H2SO4 —> ZnSO4 + Fo2(SO4)3 + 4H2O
In this instance, iron leached with zinc is changed to a form such as 20 goethite, jarosite, or hematite in an additional process, and separates/discharges the same to the outside of the process.
However, such the material includes a heavy metal and a sulfide material as zinc refining waste, so most refiners permanently store it in a special yard for preventing environmental contamination. In this case, some valuable 1 metals that are permanently stored with the zinc refining waste are not recovered.
In addition, regarding the permanent storing of environmentally harmful zinc refining wastes, it is difficult to acquire an additional yard because of concerns of local communities and gradual strengthening of environmental regulations.
The above-noted acquisition of additional yards is expected to become a major obstacle in the continuous management of the zinc refining industry.
The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
SUMMARY OF THE INVENTION
The present invention has been made in an effort to provide a method for solving a storage problem by changing zinc refining waste to an eco-friendly material, and recovering most of valuable metals including zinc from the zinc waste, as well as sulfated materials.
An exemplary embodiment of the present invention provides a method for processing a zinc ferrite, including: generating a zinc ferrite in a zinc wet refining process as a fuming metal oxide and a sulfurous flue gas through a fuming process; and allowing the fuming metal oxide and the sulfurous flue gas generated in the fuming stage to react with each other to change the same into a metal sulfate and/or a metal sulfite of a solid matter.
An example of the metal sulfate is a zinc sulfate. An example of the metal sulfite is a zinc sulfite. Zinc will be exemplified, and other metals included in a zinc refining process may be used in a present process.
The allowing of the fuming metal oxide and the sulfurous flue gas generated in the fuming stage to react with each other to change the same into a metal sulfate and/or a metal sulfite of a solid matter may be performed by a gas washer.
The method may further include allowing the acquired metal sulfite to react with the sulfuric acid and decompose the same, and the method may further include recovering a metal sulfate and concentrated sulfur dioxide (SO2) by the decomposition process.
The recovered metal sulfate may be reused in a neutral and/or weak acidic process.
The recovered concentrate sulfur dioxide may be transmitted to a sulfuric acid manufacturing process, and may be used for manufacturing sulfuric is acid.
A zinc wet refining process may be performed without iron-included waste generated in an additional strong acidic leaching process and an additional iron precipitation process according to a method for processing the zinc ferrite.
The method may further include inputting the acquired metal sulfate or metal sulfite to an imperial smelting furnace (ISF) to recover a valuable metal, and transferring sulfur dioxide generated in this instance to a sulfuric acid manufacturing process to be used for manufacturing sulfuric acid.
When the method for processing a zinc ferrite according to the embodiment of the present invention is used, leaching equipment and processes may be easily improved in the zinc refining process, and the process driving cost may be reduced.
Further, the environmental problem of permanently storing and observing the waste generated by settling leached iron may be solved, and additional valuable metals as well as zinc may be obtained.
In addition, other wastes or waste water generated in the process for processing discharged flue gas may be reduced.
In detail, the environmental problem that cannot be solved by the existing zinc refining method may be minimized, and simultaneously the recovery of zinc included in the zinc concentrate and other valuable metals may be maximized.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a processing diagram of a zinc refining process including a zinc ferrite processing method according to an embodiment of the present invention.
FIG. 2 shows a processing diagram of a process of a method for processing zinc oxide acquired by the fuming stage.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Advantages and features of the present invention and methods to achieve them will be elucidated through exemplary embodiments described below in detail with reference to the accompanying drawings. However, the present invention is not limited to exemplary embodiment disclosed herein, but may be implemented in various forms. The exemplary embodiments are provided only by way of example so that a person of ordinary skill in the art can fully understand the disclosures of the present invention and the scope of the present invention. Therefore, the present invention will be defined only by the scope of the appended claims. Like reference numerals designate like elements throughout the specification.
Accordingly, in various exemplary embodiments, well-known techniques are not explained in detail to avoid ambiguous interpretation of the present invention. Although not specifically defined, all terms including the technical and scientific terms used herein have meanings understood by persons that are ordinarily skilled in the art. Unless explicitly described to the contrary, the word “comprise” and variations such as “comprises” or “comprising” will be understood to imply the inclusion of stated elements but not the exclusion of any other elements. The terms of a singular form may include plural forms unless referred to the contrary.
FIG. 1 shows a processing diagram of a zinc refining method according to an embodiment of the present invention.
A zinc refining method according to an embodiment of the present invention will now be described with reference to FIG. 1. First, a zinc concentrate is roasted to generate a calcined product including zinc oxide (ZnO) and a zinc ferrite, and a reaction for changing sulfur into sulfur dioxide (SO2) during concentration in the roasting process may be performed.
Major components of the zinc concentrate include Zn, Fe, and S, and it includes other metals including Pb, Cu, Cd, Co, Ag, and Au.
The roasting process represents a process for oxidizing a zinc concentrate in a refractory sulfide form of sulfuric acid into a soluble zinc calcined product.
Major reactions of the roasting process are as follows.
ZnS + 3/2O2 —> ZnO + SO2
ZnS + 2FeS + 5O2 —> ZnOFe2O3 + 3SO2
The SO2 generated in the roasting process may be used to manufacture sulfuric acid in a sulfuric acid factory.
The zinc oxide and the zinc ferrite generated in the roasting process may be introduced to a calcined product leaching process.
A neutral and weak acidic leaching process represents a process for leaching the zinc oxide (ZnO) which is a major component of the calcined product generated in the roasting process in a sulfuric acid solvent.
The zinc ferrite from among the calcined product generated in the roasting process is refractory and is not leached in the neutral and weak acidic leaching process.
Major reactions in the neutral and weak acidic leaching process are as follows.
ZnO + H2SO4 —> ZnSO4 + H2O
A pH range of the neutral leaching process may be 2.0 to 2.5 when a 20 reaction starts, and the pH range may be 3.5 to 5.0 when the reaction ends.
The weak acidic leaching process leaches and changes the remaining zinc oxide (ZnO) that is not leached in the neutral leaching process.
As described above, conventionally, the strong acidic leaching process and the iron precipitation process for removing the leached iron in an iron form of goethite, hematite, or jarosite so as to process the zinc ferrite are performed, and in an embodiment of the present invention, the fuming stage is used and the strong acidic leaching process and the iron precipitation process are not performed.
The pH range of the weak acidic leaching process may be 1.5 to 2.0 when a reaction starts, and the pH range may be 2.5 to 3.0 when the reaction ends.
The zinc ferrite that is not leached in the leaching process may be introduced into the fuming process.
io The fuming process represents a process for injecting air containing a zinc ferrite, coal, and oxygen into a fuming furnace and heating the same to generate zinc oxide (ZnO) and sulfur dioxide flue gas.
A stage for performing the fuming process may be performed at a temperature range of 1250 to 1350 °C.
In the fuming process, zinc oxide (ZnO) and sulfur dioxide (SO2) flue gas are discharged by the reaction process.
Emissions caused by the fuming process may further include metal compounds such as Pb, Cu, Cd, Co, Ag, and Au included in the zinc concentrate in addition to the zinc oxide.
Further, the fuming process may include a smelting process and a reduction process so as to increase the yield and generate eco-friendly slag in an embodiment of the present invention.
In the smelting stage, air containing a zinc ferrite, coal, and oxygen may be injected and heated to generate zinc oxide (ZnO), sulfur dioxide flue gas, and slag.
Air, coal, and oxygen are additionally injected into the slag generated in the smelting stage to perform a reduction, zinc and other volatile metals remaining in the slag of the smelting stage are fumed and oxidized to recover zinc oxide (ZnO), lead oxide (PbO), an indium oxide, and silver (Ag) and to generate the sulfur dioxide flue gas.
A part of copper (Cu), (Ag), and gold (Au) that are nonvolatile materials are recovered in a smelting metal form together with a copper speiss. A stage for discharging other materials in a form of the environmentally stabilized slag may be included.
FIG. 2 shows a processing diagram of a process of a method for processing zinc oxide acquired by the fuming stage.
As can be known from FIG. 2, a method for washing the sulfur dioxide (SO2) generated in the fuming stage includes: inputting the zinc oxide acquired by the fuming stage to a gas washer, and allowing the same to react with the sulfur dioxide SO2 generated in the fuming stage to generate zinc sulfite (ZnSC>3) (first reaction); and changing the same to zinc sulfate (ZnSCL) and concentrated sulfur dioxide (SO2) through the leaching reaction of the zinc sulfite (ZnSC>3) and the sulfuric acid (H2SO4) (second reaction).
Major reactions of the first reaction and the second reaction are as follows:
ZnO + SO2 -* ZnSO3
ZnSO3 + H2SO4 —> ZnSO4 + SO2 + H2O
The zinc sulfate solution acquired by the zinc sulfite leaching stage is transferred to a neutral and weak acidic leaching process, and silver and a zinc sulfide included in the zinc sulfite residue are settled as a solid matter and are then separated to be used as base materials for a process for recovering zinc and silver.
The second reaction for processing the zinc sulfite generated by the gas washer of the first reaction inputs the same to the zinc concentrate roasting process or an imperial smelting furnace (ISF) to recover zinc from among the zinc sulfite, and the generated sulfur dioxide is processed in an imperial smelting furnace (ISF) sulfuric acid factory.
While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
The range of the present invention is provided in the claims to be described rather than the above-described detailed description, and all modifications or modified forms drawn from the meanings, range, and equivalent concepts of the claims of the patent have to be interpreted to be included in the range of the present invention.

Claims (2)

  1. WHAT IS CLAIMED IS:
    1. A method for processing a zinc ferrite, comprising: generating a zinc ferrite in a zinc wet refining process as a fuming metal
    5 oxide and a sulfurous flue gas through a fuming process; and allowing the fuming metal oxide and the sulfurous flue gas generated in the fuming stage to react with each other to change the same into a metal sulfate and/or a metal sulfite of a solid matter.
    10 2. The method of claim 1, wherein a zinc wet refining process is performed through a neutral and/or weak acidic leaching process without an additional strong acidic leaching process according to the zinc ferrite processing method.
    15 3. The method of claim 2, wherein the allowing of the fuming metal oxide and the sulfurous flue gas generated in the fuming stage to react with each other to change the same into a metal sulfate and/or a metal sulfite of a solid matter is performed by a gas washer.
    4. The method of claim 3, further comprising allowing the acquired metal sulfite to react with the sulfuric acid and decompose the same, wherein the method may further include recovering a metal sulfate and concentrated sulfur dioxide (SO2) by the decomposition process.
    5. The method of claim 4, wherein the recovered metal sulfate is reused in a neutral and/or weak acidic
    5 process.
    6. The method of claim 4, wherein the recovered metal sulfate is reused in neutral and/or weak acidic leaching process, and silver and zinc that are not leached are concentrated and io recovered as a solid matter.
    7. The method of claim 4, wherein the recovered concentrate sulfur dioxide is transmitted to a sulfuric acid manufacturing process and is used for manufacturing sulfuric acid.
    8. The method of claim 1, further comprising inputting the acquired metal sulfate or metal sulfite to an imperial smelting furnace (ISF) to recover a valuable metal, and transferring sulfur dioxide generated in this instance to a sulfuric acid manufacturing process to be
    20 used for manufacturing sulfuric acid.
    1/2
    Zinc Concentrate
    FIG. 1
    Furnace
  2. 2/2
    Zinc Ferrite
    FIG. 2
    O 'o
    Zn Product
AU2015415628A 2015-11-23 2015-11-23 Eco-friendly zinc smelting method Abandoned AU2015415628A1 (en)

Applications Claiming Priority (1)

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PCT/KR2015/012593 WO2017090784A1 (en) 2015-11-23 2015-11-23 Eco-friendly zinc smelting method

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AU (1) AU2015415628A1 (en)
MX (1) MX2018006356A (en)
WO (1) WO2017090784A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11001507B2 (en) 2018-02-01 2021-05-11 Korea Zinc Co., Ltd. Method of recovering iron from zinc sulphate solution

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4619814A (en) * 1978-05-05 1986-10-28 Provincial Holdings Ltd. Process for the recovery of non-ferrous metals from sulphide ores and concentrates
RU2109077C1 (en) * 1990-11-14 1998-04-20 Минпрок Текнолоджи Пти Лтд. Method for treatment of zinc sulfide or other zinc-containing materials, method for partial oxidation of materials containing zinc oxide, zinc sulfide and iron sulfide, method for treatment of initial material containing zinc sulfide and iron sulfide
JPH05171310A (en) * 1991-12-25 1993-07-09 Mitsubishi Materials Corp Zinc smelting method by reducing roasting
KR20000052340A (en) * 1999-01-23 2000-08-25 이호인 Zine collecting method from steel powder containing zinc ferrite
BRPI0412304B1 (en) * 2003-07-04 2013-11-26 PROCESS FOR VALUING METAL VALUES IN A WASTE WITH ZN, FE AND PB
EP1997919A1 (en) * 2007-05-24 2008-12-03 Paul Wurth S.A. Method of recovering zinc- and sulphate-rich residue
CN102134655A (en) * 2010-12-29 2011-07-27 昆明理工大学 Method for separating zinc and indium and iron from indium-enriched high-iron high-zinc calcine through reduction-magnetic separation
MX349844B (en) * 2012-07-16 2017-08-16 Tam 5 S L * Hydrometallurgical method for recovering zinc in a sulphuric medium from zinc sulphide concentrates having a high iron content.
CN102912147A (en) * 2012-11-15 2013-02-06 昆明冶金研究院 Process for recycling lead zinc, silver and iron from tailings after carrying out sulphur flotation on zinc oxygen pressure leaching slag
CN103540765B (en) * 2013-10-12 2014-12-24 中南大学 Zinc smelting technology

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11001507B2 (en) 2018-02-01 2021-05-11 Korea Zinc Co., Ltd. Method of recovering iron from zinc sulphate solution

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WO2017090784A1 (en) 2017-06-01
CN108291271A (en) 2018-07-17
MX2018006356A (en) 2018-09-24

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