WO2023234608A1 - 아연 제련 공정의 부산물인 산화철로부터 고품위 정제 산화철의 제조방법 - Google Patents
아연 제련 공정의 부산물인 산화철로부터 고품위 정제 산화철의 제조방법 Download PDFInfo
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- WO2023234608A1 WO2023234608A1 PCT/KR2023/006857 KR2023006857W WO2023234608A1 WO 2023234608 A1 WO2023234608 A1 WO 2023234608A1 KR 2023006857 W KR2023006857 W KR 2023006857W WO 2023234608 A1 WO2023234608 A1 WO 2023234608A1
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- iron oxide
- washing
- zinc
- firing
- water
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims abstract description 215
- 238000000034 method Methods 0.000 title claims abstract description 88
- 239000011701 zinc Substances 0.000 title claims abstract description 66
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 62
- 238000003723 Smelting Methods 0.000 title claims abstract description 13
- 239000006227 byproduct Substances 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 title 1
- 238000005406 washing Methods 0.000 claims abstract description 89
- 238000010304 firing Methods 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000001914 filtration Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 51
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 34
- 238000001035 drying Methods 0.000 claims description 27
- 239000000706 filtrate Substances 0.000 claims description 23
- 239000011734 sodium Substances 0.000 claims description 22
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 17
- 239000011593 sulfur Substances 0.000 claims description 17
- 229910052717 sulfur Inorganic materials 0.000 claims description 17
- 238000001556 precipitation Methods 0.000 claims description 16
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 13
- 229910052708 sodium Inorganic materials 0.000 claims description 13
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 12
- 239000011591 potassium Substances 0.000 claims description 12
- 229910052700 potassium Inorganic materials 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 238000000746 purification Methods 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 238000007670 refining Methods 0.000 abstract description 4
- 235000013980 iron oxide Nutrition 0.000 description 90
- 239000012535 impurity Substances 0.000 description 35
- 238000001354 calcination Methods 0.000 description 14
- 229910052935 jarosite Inorganic materials 0.000 description 10
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 9
- 239000005083 Zinc sulfide Substances 0.000 description 9
- 229910052984 zinc sulfide Inorganic materials 0.000 description 9
- 230000007423 decrease Effects 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000011787 zinc oxide Substances 0.000 description 4
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 4
- 229960001763 zinc sulfate Drugs 0.000 description 4
- 229910000368 zinc sulfate Inorganic materials 0.000 description 4
- 229910021260 NaFe Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 229910001813 natrojarosite Inorganic materials 0.000 description 2
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 description 2
- 235000011151 potassium sulphates Nutrition 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- -1 Jarosite Chemical class 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052598 goethite Inorganic materials 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
Images
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
- C22B7/02—Working-up flue dust
-
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting 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
- C22B19/02—Preliminary treatment of ores; Preliminary refining of 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
- 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
Definitions
- the present invention relates to a method of producing high-quality iron oxide with an iron content of 60% or more by removing impurities such as zinc, potassium, sodium, and sulfur from iron oxide, which is a by-product of the zinc smelting process.
- the sulfur component is primarily removed by calcining the iron oxide. It relates to a dry process for removing and a wet process for removing residual impurities remaining in iron oxide. And it is about the Selective Zinc Precipitation (SZP) process to recover the removed zinc.
- SZP Selective Zinc Precipitation
- Methods for extracting zinc from zinc concentrate include dry smelting and wet smelting methods.
- zinc concentrate goes through a roasting process, a dissolution process, and a purification process, and finally, it goes through an electrolysis process to extract high-purity zinc.
- iron dissolved with zinc is converted into iron oxides such as Jarosite, Goethite, or Hematite through a separate process and then separated/discharged.
- iron oxide a by-product of the zinc smelting process
- iron oxide has an iron content of 40-50% based on 100% of the total weight, and other contents include 1-5% zinc, 1-5% potassium, 1-5% sodium, and 5-10% sulfur. Includes %, etc.
- iron oxide may also contain carbon, magnesium, calcium, and aluminum. Iron oxide with a low iron content has a problem of increasing storage and transportation costs due to the large amount of iron oxide produced. Also, due to its high impurity content, it is difficult to use as a raw material in the steelmaking process, making it difficult to find a use for it.
- the purpose of the present invention is to provide a method for removing zinc, potassium, sodium, and sulfur, which are major impurities in iron oxide, and improving the iron content by using a mixed dry/wet process to solve these conventional problems. .
- One embodiment of the present invention is a method of purifying raw iron oxide, which is a by-product of a zinc smelting process, the method comprising: a sintering process of calcining the raw iron oxide; A washing process of washing the iron oxide cake with a washing liquid after firing; and providing iron oxide after purification through a first filtration process of filtering the iron oxide cake after washing with water.
- One embodiment of the present invention provides a method wherein the firing temperature of the firing process is 700°C to 950°C.
- the firing process further includes the step of drying iron oxide, the drying temperature in the step of drying the iron oxide is 90 ° C to 110 ° C, and the drying time is 2 hours or more. do.
- One embodiment of the present invention provides a method wherein the firing process is performed under atmosphere using a rotary kiln.
- One embodiment of the present invention provides a method in which the washing process is characterized in that 140 g to 160 g of the fired iron oxide cake is added per 1 L of the washing liquid.
- the purified iron oxide contains more than 60% by weight of iron, less than 0.3% by weight of zinc, less than 0.1% by weight of potassium, less than 0.1% by weight of sodium, and less than 0.5% by weight of sulfur. Provides a method.
- One embodiment of the present invention provides a method in which the washing process is characterized in that the iron oxide cake after firing is washed with a washing liquid using an autoclave.
- One embodiment of the present invention provides a method in which the washing process is characterized in that the iron oxide cake after firing is washed with a washing liquid using a stirrer.
- One embodiment of the present invention provides a method wherein the temperature of the water washing liquid in the autoclave is 130°C to 150°C.
- One embodiment of the present invention provides a method wherein the temperature of the water washing liquid in the stirrer is 130 °C to 150 °C.
- One embodiment of the present invention further includes a selective zinc precipitation process for recovering zinc from the filtrate after washing with water from the first filtration process, wherein the selective zinc precipitation process includes adding a salt to the filtrate after washing with water, Provides a method.
- One embodiment of the present invention provides a method wherein the salt is sodium carbonate.
- the selective zinc precipitation process provides a method in which the temperature of the filtrate after the water washing is 50° C. to 70° C. and the pH is 7 to 9.
- high-quality iron oxide with an iron content of 60% or more can be produced by removing impurities from iron oxide, which is a by-product of the zinc smelting process. At this time, the removal rate of zinc, potassium, sodium, and sulfur is over 90%.
- the weight of iron oxide decreases to about 60% of the initial weight, which can contribute to reducing storage and transportation costs.
- iron oxide after refining has low impurities such as zinc content of less than 0.3% and sulfur of less than 0.5%, so it can be used as a raw material for steelmaking, contributing to resource recycling and reducing the amount of industrial waste generated, which has the effect of reducing environmental pollution problems. .
- Figure 1 is a flowchart showing a process for purifying iron oxide to produce high-quality iron oxide and recovering zinc from the filtrate after washing with water, according to an embodiment of the present invention.
- Embodiments of the present disclosure are illustrated for the purpose of explaining the technical idea of the present disclosure.
- the scope of rights according to the present disclosure is not limited to the embodiments presented below or the specific description of these embodiments.
- Figure 1 is a flowchart showing a process for purifying iron oxide to produce high-quality iron oxide and recovering zinc from the filtrate after washing with water, according to an embodiment of the present invention. Referring to FIG. 1, an iron oxide purification process according to an embodiment of the present invention will be described.
- the sintering process (S100) is to remove impurities by thermally decomposing iron oxide and may include sintering the iron oxide at a high temperature.
- the step of calcining iron oxide can be performed using a rotary kiln under an air atmosphere.
- the temperature for sintering iron oxide may be 700°C to 950°C. If the firing temperature is lower than 700 °C, the decomposition reaction of jarosite, which will be described later, may not occur, and if it is higher than 950 °C, more zinc oxide will be formed than zinc sulfate during the reaction of zinc sulfide with oxygen, which will be described later, resulting in subsequent wet It can be difficult to remove from the process. Additionally, the firing temperature may be preferably 700°C to 800°C, more preferably 750°C to 800°C.
- the raw material iron oxide fired in the firing process is K-jarosite (KFe 3 (SO 4 ) 2 (OH) 6 (s)) or Na-jarosite (NaFe 3 (SO 4 ) 2 (OH) 6 (s)). May include Jarosite.
- KFe 3 (SO 4 ) 2 (OH) 6 (s) KFe(SO 4 ) 2 (s) + Fe 2 O 3 (s) + 3H 2 O(g)
- NaFe 3 (SO 4 ) 2 (OH) 6 (s) NaFe(SO 4 ) 2 (s) + Fe 2 O 3 (s) + 3H 2 O(g)
- K-jarosite can be decomposed into KFe(SO 4 ) 2 (s), Fe 2 O 3 (s), and H 2 O(g) as in formula (1-1) above. And KFe(SO 4 ) 2 (s) is again converted into K 2 SO 4 (s), Fe 2 O 3 (s), SO 2 (g) and O 2 (g) as in the above formula (2-1). It can be decomposed.
- Na-jarosite can be decomposed into NaFe(SO 4 ) 2 (s), Fe 2 O 3 (s), and H 2 O(g) as in the above formula (1-2). And NaFe(SO 4 ) 2 (s) is again divided into Na 2 SO 4 (s), Fe 2 O 3 (s), SO 2 (g) and O 2 (g) as in the above formula (2-2). It can be decomposed.
- Equations (1-1) and (1-2) may be reactions that occur at 450°C or higher.
- Equations (2-1) and (2-2) may be reactions that occur at 680°C or higher.
- Raw iron oxide may contain zinc (Zn) as an impurity.
- Zinc included as an impurity may be contained in the form of zinc sulfide, such as zinc sulfide (ZnS).
- ZnS zinc sulfide
- ZnSO 4 zinc sulfate
- the oxygen that reacts with zinc sulfide may be injected from the outside or may be oxygen generated during the decomposition of jarosite, especially oxygen generated from formula (2-1) or formula (2-2).
- zinc sulfide can react with oxygen to form zinc oxide (ZnO).
- ZnO zinc oxide
- the firing temperature is higher than 400°C
- zinc sulfide may form zinc oxide during reaction with oxygen.
- the firing temperature is higher than 950°C, the amount of zinc oxide formed increases, and since this zinc oxide is not ionized, it may be difficult to remove it in the water washing process, which is a subsequent wet process.
- the firing process (S100) may include a drying step in which all or part of the moisture contained in the iron oxide is evaporated to provide dry iron oxide.
- the drying step may be accomplished using a rotary kiln, but is not limited to this.
- the temperature at which the drying step is performed may be 90° C. or higher. Since the temperature at which the drying step is performed is lower than the temperature at which the iron oxide calcination step is performed, the iron oxide calcination step may proceed after the drying step. At this time, as the temperature of iron oxide in the rotary kiln increases, the drying step and the step of calcining the iron oxide progress, so the drying step and the step of calcining the iron oxide may not be clearly distinguished.
- the drying step may be performed separately before the step of calcining the iron oxide.
- the temperature at which the drying step is performed may be 90° C. or higher. If the drying temperature is lower than 90°C, drying may not occur properly. Additionally, the drying temperature may preferably be 90°C to 110°C.
- the drying step may take more than 2 hours. In addition, the time during which the drying step proceeds is preferably between 2 hours and 24 hours, and more preferably between 2 hours and 4 hours.
- the iron oxide cake after going through the firing process may contain 4% by weight or less of sulfur (S) component based on the weight of the entire iron oxide cake.
- impurities contained in the iron oxide cake such as zinc, potassium, sodium, and sulfur components that have not been removed in the form of gas, may be contained in the form of water-soluble substances.
- impurities contained in the iron oxide cake after firing may be zinc sulfate (ZnSO 4 (s)), potassium sulfate (K 2 SO 4 (s)), and/or sodium sulfate (Na 2 SO 4 (s)).
- the sulfur removal rate may be 60% or more
- the sodium removal rate may be 10% or more.
- the washing process (S200) is a process of removing impurities by washing the iron oxide cake with a washing liquid after firing.
- the washing liquid used in the washing process (S200) may be water.
- the washing process can be performed using water at room temperature. Specifically, when using a stirrer, the water washing process may be performed at a temperature of 20°C to 30°C. Additionally, water at different temperatures can be used to improve washing efficiency.
- the water washing process (S200) may be performed at normal pressure.
- the water washing process (S200) may be performed for 1 to 3 hours.
- the washing process may be performed by adding 140 g to 160 g of the iron oxide cake after firing per 1 L of the washing liquid. If less than 140 g of iron oxide cake after firing is added per 1 L of washing liquid, the amount of washing liquid used may increase and the size of the facility may increase. If more than 160 g of iron oxide cake after firing is added per 1 L of washing liquid, washing efficiency may decrease.
- Impurities removed in the water washing process may be water-soluble impurities contained in the iron oxide cake after firing.
- water-soluble impurities may include zinc sulfate (ZnSO 4 (s)), potassium sulfate (K 2 SO 4 (s)), and/or sodium sulfate (Na 2 SO 4 (s)).
- the temperature and pressure in the water washing process (S200) can be increased using an autoclave, and then the iron oxide cake can be washed with water after firing.
- the water washing process using an autoclave may be carried out at a pressure of 2 bar to 3 bar and may be carried out for 1 hour to 3 hours. At this time, if the water washing process time using an autoclave is less than 1 hour, the impurity removal efficiency may decrease, and if it is more than 3 hours, the effect on impurity removal efficiency is minimal, but costs may increase due to the increase in process time. there is.
- the temperature of the washing liquid may be 130°C to 150°C. At this time, if the temperature of the washing liquid is less than 130°C, the impurity control efficiency may decrease.
- Iron oxide obtained through a water washing process using an autoclave may have a higher impurity removal rate than iron oxide obtained through a water washing process at room temperature and pressure.
- the iron oxide cake can be filtered through a filter to obtain purified iron oxide.
- the purified iron oxide obtained after the filtration process may contain 3% by weight or less of zinc, 0.8% by weight or less of sodium, 3% by weight or less of potassium, and/or 8% by weight or less of sulfur.
- the iron oxide may have an iron content of 60% by weight or more because impurities have been removed.
- the iron oxide after purification may preferably be a high-grade iron oxide containing 0.3% by weight or less of zinc, 0.1% by weight or less of sodium, 0.1% by weight or less of potassium, and 0.5% by weight or less of sulfur.
- the iron oxide cake is filtered through a filter, purified, and the iron oxide is separated.
- the remaining filtrate after washing may contain zinc.
- SZP Selective Zinc Precipitation
- salt can be added to the filtrate after washing with water.
- the salt may be sodium carbonate (Na 2 CO 3 ).
- the selective zinc precipitation process (S400) may have a pH of 7 to 9 by adding salt. At this time, if the pH is less than 7, the zinc recovery rate may decrease, and if the pH exceeds 9, components other than zinc may precipitate.
- the temperature of the filtrate after washing with water may be 50°C to 70°C. At this time, if the temperature of the filtrate after washing with water is less than 50°C, process efficiency may decrease.
- the zinc contained in the filtrate may react with salt and precipitate in a solid state as shown in equation (4) below.
- the zinc contained in the filtrate after washing with water is precipitated in the form of ZnCO 3 (s) through the second filtration process (S500), and more than 99% of the zinc in the filtrate can be recovered.
- high-quality iron oxide with an iron content of 60% or more can be produced by removing impurities from iron oxide, which is a by-product of the zinc smelting process. At this time, the removal rate of zinc, potassium, sodium, and sulfur is over 90%.
- the weight of iron oxide decreases to about 60% of the initial weight, and the iron oxide after purification has lower impurities, such as zinc content of 0.3% or less and sulfur content of 0.5% or less.
- the main components, excluding moisture, of the raw iron oxide, which is a by-product of zinc smelting according to an embodiment of the present invention, are shown in Table 1 below.
- the raw iron oxide was dried at 100°C for 24 hours. At this time, the moisture content of iron oxide after drying is 24%.
- the iron oxide was fired at 700°C, 750°C, 800°C, 850°C, and 950°C for 2 hours.
- the weight reduction of iron oxide according to each firing temperature is as follows.
- the weight percent of ingredients contained in the iron oxide cake and the removal rate of impurities after firing according to each firing temperature are as follows.
- Example 1 700°C weight% 53.9 2.29 0.79 2.98 3.72 Removal rate (%) 0.12 14.78 0.52 63.8
- Example 2 750°C weight% 55.1 2.34 0.84 3.05 3.51 Removal rate (%) 0.04 10.53 0.46 66.5
- Example 3 800°C weight% 55.8 2.35 0.85 3.09 3.13 Removal rate (%) 0.34 10.52 0.14 70.4
- Example 4 850°C weight% 56.2 2.36 0.87 3.09 3.22 Removal rate (%) 0.77 9.13 0.81 69.8
- Example 5 950°C weight% 56.4 2.41 0.90 3.13 2.47 Removal rate (%) 0.14 7.37 0.96 77.2
- the iron oxide cake was added and then stirred for 2 hours at room temperature (25°C) and normal pressure (1 bar) and washed with water. After completing the water washing, the washing liquid was placed in a filter and filtered to separate the iron oxide and the filtrate. Afterwards, the iron oxide was dried and the remaining weight was measured and component analysis was performed. For comparison, unfired iron oxide was tested under the same conditions. At this time, the moisture content of iron oxide after drying is 30%.
- the weight percent of components contained in the iron oxide and the removal rate of impurities after purification are as follows.
- Example 1 700°C weight% 65.2 0.29 0.18 0.15 0.48 Removal rate (%) 89.8 81.8 96.1 89.7
- Example 2 750°C weight% 65.6 0.28 0.09 0.09 0.35 Removal rate (%) 90.0 91.2 97.5 91.7
- Example 3 800°C weight% 67.5 0.44 0.04 0.09 0.21 Removal rate (%) 84.5 95.7 97.6 94.5
- Example 4 850°C weight% 64.8 0.73 0.06 0.12 0.35 Removal rate (%) 73.7 93.9 96.8 90.7
- Example 5 950°C weight% 64.1 2.12 0.01 0.02 0.04 Removal rate (%) 22.7 98.9 99.5 98.7 Comparative Example 1 No firing weight% 43.3 1.27 0.71 2.39 7.53 Removal rate (%) 30.5 3.4 0.1 8.2
- the removal rate of impurities was found to be higher in the example in which the iron oxide was washed with water after the calcination process than in the comparative example in which the iron oxide was washed with water without calcination.
- the removal rates of four types of impurities, zinc, sodium, potassium, and sulfur were all over 90%, so impurities were removed best.
- the water washing process was performed at 60°C, 90°C using iron oxide, and 140°C (pressure 2.5 bar) using an autoclave, respectively.
- the stirring time (2 hours) and the amount of iron oxide added were kept the same, and only the water temperature was changed for washing.
- the weight percent of components contained in iron oxide and the removal rate of impurities are as follows.
- Example 6 which was washed with water under pressure and a temperature of 140°C, the removal rate of impurities increased compared to Example 2, which did not use an autoclave.
- the zinc content in the filtrate was 2,950 mg/l, and after going through the selective zinc precipitation process, the zinc content in the filtrate decreased to 2.65 mg/l.
- zinc was precipitated in the form of ZnCO 3 (s), and after washing with water, more than 99% of the zinc in the filtrate could be recovered.
- 6.5 g of precipitate was generated per 1 L of filtrate after washing with water.
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Abstract
Description
구분 | Fe | Zn | Na | K | S |
중량% | 41.7 | 1.76 | 0.71 | 2.26 | 7.90 |
구분 | 700℃ | 750℃ | 800℃ | 850℃ | 950℃ |
무게감소율(%) | 23.2 | 24.7 | 25.4 | 26.0 | 27.0 |
소성 온도 | 구분 | Fe | Zn | Na | K | S | |
실시예 1 | 700℃ | 중량% | 53.9 | 2.29 | 0.79 | 2.98 | 3.72 |
제거율(%) | 0.12 | 14.78 | 0.52 | 63.8 | |||
실시예 2 | 750℃ | 중량% | 55.1 | 2.34 | 0.84 | 3.05 | 3.51 |
제거율(%) | 0.04 | 10.53 | 0.46 | 66.5 | |||
실시예 3 | 800℃ | 중량% | 55.8 | 2.35 | 0.85 | 3.09 | 3.13 |
제거율(%) | 0.34 | 10.52 | 0.14 | 70.4 | |||
실시예 4 | 850℃ | 중량% | 56.2 | 2.36 | 0.87 | 3.09 | 3.22 |
제거율(%) | 0.77 | 9.13 | 0.81 | 69.8 | |||
실시예 5 | 950℃ | 중량% | 56.4 | 2.41 | 0.90 | 3.13 | 2.47 |
제거율(%) | 0.14 | 7.37 | 0.96 | 77.2 |
소성 온도 | 구분 | Fe | Zn | Na | K | S | |
실시예 1 | 700℃ | 중량% | 65.2 | 0.29 | 0.18 | 0.15 | 0.48 |
제거율(%) | 89.8 | 81.8 | 96.1 | 89.7 | |||
실시예 2 | 750℃ | 중량% | 65.6 | 0.28 | 0.09 | 0.09 | 0.35 |
제거율(%) | 90.0 | 91.2 | 97.5 | 91.7 | |||
실시예 3 | 800℃ | 중량% | 67.5 | 0.44 | 0.04 | 0.09 | 0.21 |
제거율(%) | 84.5 | 95.7 | 97.6 | 94.5 | |||
실시예 4 | 850℃ | 중량% | 64.8 | 0.73 | 0.06 | 0.12 | 0.35 |
제거율(%) | 73.7 | 93.9 | 96.8 | 90.7 | |||
실시예 5 | 950℃ | 중량% | 64.1 | 2.12 | 0.01 | 0.02 | 0.04 |
제거율(%) | 22.7 | 98.9 | 99.5 | 98.7 | |||
비교예 1 | 소성을 하지 않음 | 중량% | 43.3 | 1.27 | 0.71 | 2.39 | 7.53 |
제거율(%) | 30.5 | 3.4 | 0.1 | 8.2 |
수세액 온도 | 구분 | Fe | Zn | Na | K | S | |
실시예 6 | 140℃ | 중량% | 67.9 | 0.15 | 0.07 | 0.08 | 0.32 |
제거율(%) | 94.9 | 98.0 | 94.0 | 92.9 | |||
비교예 2 | 60℃ | 중량% | 65.7 | 0.27 | 0.09 | 0.09 | 0.34 |
제거율(%) | 90.4 | 91.6 | 97.6 | 91.9 | |||
비교예 3 | 90℃ | 중량% | 65.7 | 0.27 | 0.08 | 0.08 | 0.34 |
제거율(%) | 90.4 | 91.9 | 97.9 | 91.9 |
Claims (13)
- 아연 제련 공정의 부산물인 원료 산화철을 정제하는 방법으로서,상기 방법은 상기 원료 산화철을 소성하는 소성 공정;소성 후 산화철 케이크를 수세액으로 수세하는 수세 공정; 및수세 후 산화철 케이크를 여과하는 제1여과 공정을 거쳐 정제 후 산화철을 제공하는, 방법.
- 제1항에 있어서,상기 소성 공정의 소성 온도는 700 ℃ 내지 950 ℃인, 방법.
- 제1항에 있어서,상기 소성 공정은 산화철을 건조하는 단계를 더 포함하며,상기 산화철을 건조하는 단계에서의 건조 온도는 90 ℃ 내지 110 ℃이고, 건조 시간은 2시간 이상인, 방법.
- 제1항에 있어서,상기 소성 공정은 로터리 킬른을 이용하여 대기 하에서 수행하는 것을 특징으로 하는, 방법.
- 제1항에 있어서,상기 수세 공정은 수세액 1L 당 상기 소성 후 산화철 케이크를 140 g 내지 160 g 투입하는 것을 특징으로 하는, 방법.
- 제1항에 있어서,상기 정제 후 산화철은 60 중량% 이상의 철, 0.3 중량% 이하의 아연, 0.1 중량% 이하의 칼륨, 0.1 중량% 이하의 나트륨 및 0.5 중량% 이하의 황을 포함하는, 방법.
- 제1항에 있어서,상기 수세 공정은 오토클레이브를 이용하여 상기 소성 후 산화철 케이크를 수세액으로 수세하는 것을 특징으로 하는, 방법.
- 제1항에 있어서,상기 수세 공정은 교반기를 이용하여 상기 소성 후 산화철 케이크를 수세액으로 수세하는 것을 특징으로 하는, 방법.
- 제7항에 있어서, 상기 수세액의 온도는 130 ℃ 내지 150 ℃인 것을 특징으로 하는, 방법.
- 제8항에 있어서, 상기 수세액의 온도는 20 ℃ 내지 30 ℃인 것을 특징으로 하는, 방법.
- 제1항에 있어서,제1여과 공정에서 나오는 수세 후 여액으로부터 아연을 회수하는 선택적 아연 침전 공정을 더 포함하고,상기 선택적 아연 침전 공정은 상기 수세 후 여액에 염을 투입하는 것을 포함하는, 방법.
- 제11항에 있어서,상기 염은 탄산나트륨인, 방법.
- 제11항에 있어서,상기 선택적 아연 침전 공정은 상기 수세 후 여액의 온도가 50 ℃ 내지 70 ℃이고, pH가 7 내지 9인, 방법.
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AU2023222922A AU2023222922A1 (en) | 2022-10-14 | 2023-05-19 | Method for manufacturing high-grade refined iron oxide from iron oxide as by-product of zinc smelting process |
PE2024001562A PE20241720A1 (es) | 2022-10-14 | 2023-05-19 | Metodo para fabricar oxido de hierro refinado de alta calidad a partir de oxido de hierro como subproducto de un proceso de fundicion de zinc |
JP2023552357A JP2024524803A (ja) | 2022-10-14 | 2023-05-19 | 亜鉛製錬工程の副産物である酸化鉄からの高品位精製酸化鉄の製造方法 |
CN202380013025.2A CN118215748A (zh) | 2022-10-14 | 2023-05-19 | 由锌冶炼工序的副产物氧化铁制造高级精炼氧化铁的方法 |
MX2024003081A MX2024003081A (es) | 2022-10-14 | 2023-05-19 | Metodo para fabricar oxido de hierro refinado de alta calidad a partir de oxido de hierro como subproducto de un proceso de fundicion de zinc. |
US18/548,285 US20240344173A1 (en) | 2022-10-14 | 2023-05-19 | Method for manufacturing high-grade refined iron oxide from iron oxide as by-product of zinc smelting process |
CA3211916A CA3211916A1 (en) | 2022-10-14 | 2023-05-19 | Method for manufacturing high-grade refined iron oxide from iron oxide as by-product of zinc smelting process |
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Citations (5)
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KR890002856A (ko) * | 1987-07-30 | 1989-04-11 | 최근선 | 브이씨알의 재생기능 제어장치 및 그 제어방법 |
JPH05171310A (ja) * | 1991-12-25 | 1993-07-09 | Mitsubishi Materials Corp | 還元焙焼による亜鉛製錬法 |
KR100366866B1 (ko) * | 1994-12-02 | 2003-02-11 | 메탈스 리사이클링 테크날러지즈 코퍼레이션 | 철원료 제조방법 |
KR20030092062A (ko) * | 2001-04-10 | 2003-12-03 | 바스프 악티엔게젤샤프트 | 고 정제도를 갖는 산화철 |
KR100625521B1 (ko) * | 2005-06-21 | 2006-09-20 | 심재윤 | 아연재를 이용한 초미립자 활성산화아연 분말의 제조방법및 그 제조물 |
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2022
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2023
- 2023-05-19 CA CA3211916A patent/CA3211916A1/en active Pending
- 2023-05-19 WO PCT/KR2023/006857 patent/WO2023234608A1/ko active Application Filing
- 2023-05-19 US US18/548,285 patent/US20240344173A1/en active Pending
- 2023-05-19 PE PE2024001562A patent/PE20241720A1/es unknown
- 2023-05-19 CN CN202380013025.2A patent/CN118215748A/zh active Pending
- 2023-05-19 MX MX2024003081A patent/MX2024003081A/es unknown
- 2023-05-19 JP JP2023552357A patent/JP2024524803A/ja active Pending
- 2023-05-19 AU AU2023222922A patent/AU2023222922A1/en active Pending
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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KR890002856A (ko) * | 1987-07-30 | 1989-04-11 | 최근선 | 브이씨알의 재생기능 제어장치 및 그 제어방법 |
JPH05171310A (ja) * | 1991-12-25 | 1993-07-09 | Mitsubishi Materials Corp | 還元焙焼による亜鉛製錬法 |
KR100366866B1 (ko) * | 1994-12-02 | 2003-02-11 | 메탈스 리사이클링 테크날러지즈 코퍼레이션 | 철원료 제조방법 |
KR20030092062A (ko) * | 2001-04-10 | 2003-12-03 | 바스프 악티엔게젤샤프트 | 고 정제도를 갖는 산화철 |
KR100625521B1 (ko) * | 2005-06-21 | 2006-09-20 | 심재윤 | 아연재를 이용한 초미립자 활성산화아연 분말의 제조방법및 그 제조물 |
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AU2023222922A1 (en) | 2024-05-02 |
PE20241720A1 (es) | 2024-08-19 |
US20240344173A1 (en) | 2024-10-17 |
MX2024003081A (es) | 2024-03-27 |
TW202415624A (zh) | 2024-04-16 |
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