CN117625953A - Method for producing ferronickel by fluidized pre-heating and pre-reducing brown iron type laterite-nickel ore through electric furnace smelting - Google Patents
Method for producing ferronickel by fluidized pre-heating and pre-reducing brown iron type laterite-nickel ore through electric furnace smelting Download PDFInfo
- Publication number
- CN117625953A CN117625953A CN202311668574.1A CN202311668574A CN117625953A CN 117625953 A CN117625953 A CN 117625953A CN 202311668574 A CN202311668574 A CN 202311668574A CN 117625953 A CN117625953 A CN 117625953A
- Authority
- CN
- China
- Prior art keywords
- laterite
- nickel ore
- nickel
- solid material
- fluidized
- Prior art date
- 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.)
- Pending
Links
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 235
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 184
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 138
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 87
- 238000003723 Smelting Methods 0.000 title claims abstract description 54
- 238000010438 heat treatment Methods 0.000 title claims abstract description 34
- 229910000863 Ferronickel Inorganic materials 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 239000011343 solid material Substances 0.000 claims abstract description 91
- 239000000463 material Substances 0.000 claims abstract description 34
- 229910001710 laterite Inorganic materials 0.000 claims abstract description 22
- 239000011504 laterite Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000007787 solid Substances 0.000 claims abstract description 16
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 14
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 10
- 239000000956 alloy Substances 0.000 claims abstract description 10
- 229910052598 goethite Inorganic materials 0.000 claims abstract description 9
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 claims abstract description 9
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000003860 storage Methods 0.000 claims abstract description 3
- 238000006722 reduction reaction Methods 0.000 claims description 71
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 59
- 239000007789 gas Substances 0.000 claims description 45
- 239000006004 Quartz sand Substances 0.000 claims description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 30
- 238000001465 metallisation Methods 0.000 claims description 27
- 238000011084 recovery Methods 0.000 claims description 26
- 230000004907 flux Effects 0.000 claims description 15
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 11
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 11
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 11
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 10
- 229910052595 hematite Inorganic materials 0.000 claims description 10
- 239000011019 hematite Substances 0.000 claims description 10
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 239000003345 natural gas Substances 0.000 claims description 4
- 239000003034 coal gas Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 36
- 238000002386 leaching Methods 0.000 abstract description 11
- 230000018044 dehydration Effects 0.000 abstract description 10
- 238000006297 dehydration reaction Methods 0.000 abstract description 10
- 239000002253 acid Substances 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 238000012546 transfer Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 10
- 239000002994 raw material Substances 0.000 description 7
- 238000005243 fluidization Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- -1 electroplating Substances 0.000 description 2
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- WWNBZGLDODTKEM-UHFFFAOYSA-N sulfanylidenenickel Chemical compound [Ni]=S WWNBZGLDODTKEM-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910002555 FeNi Inorganic materials 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- QXZUUHYBWMWJHK-UHFFFAOYSA-N [Co].[Ni] Chemical compound [Co].[Ni] QXZUUHYBWMWJHK-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
A method for producing ferronickel by fluidized pre-heating and pre-reducing of brown iron type laterite nickel ore through electric furnace smelting belongs to the technical field of mineral processing and metallurgy, and comprises the following steps: finely crushing brown iron type laterite nickel ore and then placing the crushed red iron type laterite nickel ore in a storage bin; feeding the laterite-nickel ore into a multi-stage cyclone preheating dehydration system, preheating, removing adsorbed water, and then, dehydrating and roasting in a heating system to decompose goethite in the laterite-nickel ore to form a dehydrated material; forming a primary solid material after gas-solid separation, and performing selective reduction roasting to form a reduction material; gas-solid separation is carried out to form a secondary solid material, the secondary solid material enters an electric furnace smelting reduction reactor after the silicon-iron ratio is regulated, and ferric silicate and ferronickel are formed to flow out from a discharge hole respectively; and cooling to obtain the ferric silicate slag and the ferronickel alloy. The method has high gas-solid mass transfer and heat transfer efficiency, rapid reaction and low roasting energy consumption, solves the problem that tailings of the high-pressure acid leaching process are difficult to treat, and realizes the comprehensive utilization of the limonite laterite-nickel ore.
Description
Technical Field
The invention belongs to the technical field of mineral processing and metallurgy, and particularly relates to a method for producing ferronickel by fluidized pre-heating prereduction-electric furnace smelting of brown iron type laterite-nickel ores.
Background
Nickel is an important strategic metal and is widely applied to the fields of stainless steel manufacture, battery materials, electroplating, catalysts and the like. With the gradual exhaustion of nickel sulfide ore resources, people put the nickel sulfide ore with huge reserves on the nickel oxide ore, and in recent years, the use ratio of laterite-nickel ore in smelting is up to 70%. At present, serpentine type laterite-nickel ore is well applied in a pyrogenic process. But brown iron type laterite nickel ore is piled up, the ore contains 0.8 to 1.3 percent of Ni and 40 to 50 percent of Fe, and is a nickel-iron co-associated resource. Therefore, the efficient utilization and development of the brown iron type laterite-nickel ore have important significance for the strategic safety of nickel and iron metals in China.
Patent CN102345019a discloses a method for treating brown iron type laterite-nickel ore, which comprises pulverizing laterite-nickel ore into fine powder, mixing with acid, curing and roasting, leaching nickel from the cured and roasted raw material by water; the water leaching slag is mixed with 3-20% of coal powder and then subjected to magnetizing roasting, grinding and magnetic separation to obtain the iron concentrate powder with TFe of 63%, so that the separation and comprehensive recovery of nickel and iron are effectively realized.
Patent CN112322909a discloses a method for extracting valuable metal elements and regenerating and circulating acid and alkali of laterite-nickel ore by sulfuric acid leaching method, which comprises mixing laterite-nickel ore powder with sulfuric acid for pulping, selectively leaching under high pressure, concentrating and separating leached pulp, using bottom flow as iron concentrate, adding pH regulator into overflow liquid for precipitation reaction, filtering to obtain nickel-cobalt concentrate, evaporating and concentrating filtrate to obtain magnesium sulfate crystal.
In general, the high-pressure acid leaching process is a mainstream process for treating brown iron type laterite nickel ore at present, but has the problems of long process flow, high production cost, easy corrosion and scaling of a high-pressure reaction kettle and the like, and particularly leaching slag is difficult to treat. Therefore, development of an innovative process is needed to fundamentally avoid the problems caused by the acid leaching process and realize efficient development and utilization of low-grade brown iron laterite-nickel ore.
Disclosure of Invention
Aiming at the problems of high production cost, difficult tailings treatment, serious equipment corrosion and the like of the existing acid leaching process, the invention provides a method for producing ferronickel by carrying out fluidization pre-reduction-electric furnace smelting on limonite laterite nickel ores, which comprises the steps of multistage fluidization dehydration roasting, then fluidization selective reduction, accurate control of reduction degree of iron and nickel oxide, reduction of limonite into ferrous oxide, reduction of ferrous oxide into metallic iron with a metallization rate less than or equal to 10, and reduction of nickel oxide into metallic nickel with a metallization rate more than or equal to 95 percent; finally, the silicon-iron ratio of the slag system, namely SiO, is adjusted by adding quartz sand 2 The molar ratio of FeO is (0.45-0.60): 1, carrying out electric furnace smelting to obtain high-grade ferronickel alloy and ferric silicate slag, and realizing the efficient separation and recovery of nickel in low-grade brown iron type laterite-nickel ore.
The invention relates to a method for producing ferronickel by fluidized pre-heating and pre-reducing of brown iron type laterite-nickel ore through electric furnace smelting, which specifically comprises the following steps:
(1) Finely crushing brown iron type laterite nickel ore until the granularity is less than or equal to 1.5mm, and then feeding the crushed brown iron type laterite nickel ore into a storage bin, wherein the part with the granularity less than 0.074mm accounts for 25-40% of the total mass;
(2) The laterite-nickel ore is discharged from a feed bin and then is continuously fed into a multi-stage cyclone preheating dehydration system by a screw feeder, the high-temperature flue gas is preheated to remove adsorbed water and then is fed into a fluidized roasting main furnace heating system to be dehydrated and roasted, so that goethite in the laterite-nickel ore is completely decomposed into hematite, and a dehydrated material is formed after the goethite is decomposed;
(3) The dehydrated material is subjected to primary gas-solid separation to form a primary solid material, the primary solid material enters a fluidized reduction reactor and is subjected to fluidized selective reduction roasting with reducing gas, so that nickel oxide in the primary solid material is reduced to metallic nickel, hematite is selectively reduced to ferrous oxide and a small amount of metallic iron, and the reduced material is formed after selective reduction roasting;
(4) The reduction material is subjected to secondary gas-solid separation to form a secondary solid material, the secondary solid material is mixed with quartz sand flux to adjust the silicon-iron ratio, and then the mixture is fed into an electric furnace for smelting, so that ferrous oxide in the secondary solid material and quartz sand are fused to form ferric silicate, metallic iron and metallic nickel are fused to form molten nickel, the molten nickel is discharged from a slag discharge hole and a molten nickel discharge hole respectively after smelting, and the molten nickel is cooled to form ferric silicate slag and ferronickel alloy.
Wherein:
in the step (1), the Ni grade of the brown iron type laterite nickel ore is 0.7-1.3%, and the brown iron type laterite nickel ore contains TFe 40-50% by weight and SiO 2 3～5％，Al 2 O 3 4 to 6 percent, 4 to 6 percent of CaO, 0.5 to 5 percent of MgO, and the water content is less than or equal to 15 percent.
In the step (2), the preheating temperature of the multi-stage cyclone preheating system is 450-650 ℃, and the ratio of the volume flow of gas entering the multi-stage cyclone preheating system to the mass flow of laterite-nickel ore is 0.10-0.30 m 3 The roasting temperature of the fluidized roasting main furnace heating system is 800-1000 ℃.
In the step (2), adsorbed water is removed in the process of preheating laterite-nickel ore, and the main reaction formula for decomposing goethite into hematite in the process of dehydration and roasting is as follows:
H 2 O(l)＝H 2 O(g) (1)
2FeO(OH)＝Fe 2 O 3 +H 2 O (2)。
in the step (3), the high-temperature flue gas after primary gas-solid separation of the dehydrated material is fed into a multi-stage cyclone preheating dehydration system to preheat the laterite-nickel ore.
In the step (3), the reducing gas is cracked by coal gas or natural gas to generate H 2 Mixing CO and nitrogen.
In the step (3), the temperature of the primary solid material in the reduction reactor for reduction reaction is 600-700 ℃, the residence time of the primary solid material in the reduction reactor is 30-60 min, and the primary solid material enters the reduction reactorH in reducing gas 2 And the total amount of CO and Fe in the primary solid material 2 O 3 The molar ratio of (1.0-1.5) is 0.06-0.40 m 3 /kg。
In the step (3), the metallization rate of nickel in the reduced material is more than or equal to 95 percent, and the metallization rate of iron is less than or equal to 10 percent.
In the step (3), nickel oxide is reduced to metallic nickel in the selective reduction roasting process, hematite is selectively reduced to ferrous oxide and a small amount of metallic iron, and the main reaction formula is as follows:
NiO+CO/H 2 ＝Ni+CO 2 /H 2 O (3)
Fe 2 O 3 +CO/H 2 ＝2FeO+CO 2 /H 2 O (4)
FeO+CO/H 2 ＝Fe+CO 2 /H 2 O (5)。
in the step (4), the excess reducing gas after the secondary gas-solid separation of the reducing material is fed into a fluidized roasting main furnace heating system to be used as fuel for combustion.
In the step (4), the silicon-iron ratio is specifically adjusted by adjusting SiO in the secondary solid material 2 The molar ratio of FeO is (0.45-0.60): 1, the addition amount of the quartz sand flux is 15-30% of the total weight of the laterite-nickel ore.
In the step (4), ferrous oxide and quartz sand are fused to form ferric silicate in the electric furnace smelting process, and metallic iron and metallic nickel are fused to form nickel-iron water, wherein the main reaction formula is as follows:
2FeO+SiO 2 ＝Fe 2 SiO 4 (6)
Fe+Ni＝FeNi (7)。
in the step (4), the smelting temperature of the secondary solid material in an electric furnace is 1500-1550 ℃ and the smelting time is 30-90 min.
In the step (4), the nickel-iron alloy contains 10 to 35 percent of Ni and 60 to 85 percent of TFe according to mass percent; wherein the recovery rate of Ni is more than or equal to 95 percent and the recovery rate of Fe is 5 to 10 percent.
The basic principle of the invention is that brown ironThe laterite nickel ore is dehydrated and decomposed by multistage cyclone dehydration at 450-650 ℃ and fluidization roasting heating at 800-1000 ℃ to remove adsorbed water and structural water in the laterite nickel ore, and goethite FeO (OH) is converted into hematite Fe 2 O 3 The method comprises the steps of carrying out a first treatment on the surface of the Since nickel oxide is easier to undergo reduction reaction than iron oxide, the obtained hematite Fe is obtained by controlling the reduction conditions 2 O 3 Selectively reducing the nickel oxide NiO into FeO in a fluidization state, and reducing a small amount of FeO to generate metallic iron Fe with a metallization rate of less than or equal to 10%, wherein the nickel oxide NiO is reduced into metallic Ni with a metallization rate of more than or equal to 95% at a temperature of 600-700 ℃; the metal nickel Ni and the metal iron Fe in the reduced material are fused in the electric furnace smelting process at the temperature of 1500-1550 ℃ to form high-grade nickel-iron alloy, and are discharged through a nickel molten iron discharge hole; meanwhile, under the condition of high-temperature electric furnace smelting, the silicon-iron ratio, namely SiO, in the reduced material is adjusted by adding quartz sand flux 2 The molar ratio of FeO is (0.45-0.60): 1, forming low-melting point liquid ferric silicate, discharging through a slag discharge hole, and cooling to be used as a high-quality raw material of cement.
Compared with the existing process for treating brown iron type laterite-nickel ore by a high-pressure acid leaching method, the method can obtain high-grade nickel-iron alloy and smelting slag serving as a cement raw material, effectively solves the problem that tailings are difficult to treat in the high-pressure acid leaching process, and realizes comprehensive utilization of brown iron type laterite-nickel ore; and when the solid particles are in a fluidization motion state, the gas-solid mass transfer and heat transfer efficiency is high, the reaction is rapid, and the roasting energy consumption is low. The material preheating, heating, reduction and smelting are carried out step by step, the product properties of each stage are controllable and adjustable, the accurate control of mineral phases in the dehydration, reduction and smelting processes can be realized, nickel oxide NiO in the raw materials is selectively reduced to metal Ni, and the metallization rate of iron is controlled, so that the consumption of reducing agents is reduced, and the cost is reduced; a small amount of metallic iron and metallic nickel are fused to form high-grade ferronickel alloy, and most of goethite is converted into ferrous oxide and finally reacts with quartz sand to generate low-melting-point ferric silicate; meanwhile, the whole set of method has high heat recycling efficiency and large equipment treatment capacity, is convenient for automatic operation and is easy to realize industrialization.
Drawings
FIG. 1 is a schematic diagram of a process flow for producing ferronickel by fluidized pre-heating prereduction-electric furnace smelting of limonite type laterite-nickel ores in an embodiment of the invention;
FIG. 2 is a schematic diagram of a multi-cyclone pre-heating dehydration system in an embodiment of the invention.
Detailed Description
For a further description of the invention, the process according to the invention is described in further detail below with reference to the drawings and examples.
The raw material quartz sand used in the embodiment of the invention contains SiO 2 The weight percentage is more than or equal to 90 percent, and the burning loss is less than or equal to 1 percent.
In the embodiment of the invention, the bottom of the fluidized roasting main furnace is provided with the combustion station, and the combustion station combusts natural gas to form high-temperature flue gas so that laterite-nickel ore in the furnace is in a suspension state.
The reducing gas in the embodiment of the invention generates H by cracking coal gas or natural gas 2 Mixing CO and nitrogen.
Example 1
The method for producing ferronickel by fluidized pre-heating and pre-reducing of brown iron type laterite nickel ore through electric furnace smelting comprises the following steps:
(1) The brown iron type laterite-nickel ore is finely crushed to the granularity less than or equal to 1.5mm and then is fed into a feed bin, wherein the part with the granularity less than 0.074mm accounts for 35 percent of the total mass, the Ni grade of the brown iron type laterite-nickel ore is 0.76 percent, and the brown iron type laterite-nickel ore comprises TFe 42.82 percent and SiO by weight percent 2 4.59％，Al 2 O 3 5.07%, caO 5.45%, mgO 1.86%, and water 13.98%;
(2) The laterite nickel ore is discharged from the stock bin and then is continuously fed into a multi-stage cyclone preheating dehydration system by a screw feeder, the preheating temperature of the cyclone preheating system is 450 ℃, and the ratio of the gas volume flow of the cyclone preheating system to the mass flow of the laterite nickel ore is 0.15m 3 After the adsorption water is removed by preheating the high-temperature flue gas, the laterite-nickel ore is fed into a fluidized roasting main furnace heating system for dehydration roasting, the roasting temperature of the heating system is 850 ℃, so that goethite in the laterite-nickel ore is completely decomposed into hematite,decomposing to form a dehydrated material;
(3) The dehydrated material is subjected to primary gas-solid separation to form a primary solid material, high-temperature flue gas after primary gas-solid separation is fed into a multi-stage cyclone preheating and drying system to preheat laterite-nickel ore, the primary solid material enters a fluidized reduction reactor to be subjected to fluidized selective reduction roasting with reducing gas, the temperature of the primary solid material when the reduction reactor is subjected to reduction reaction is 600 ℃, the residence time of the primary solid material in the reduction reactor is 30min, and H in the reducing gas entering the reduction reactor 2 And the total amount of CO and Fe in the primary solid material 2 O 3 The molar ratio of the reducing gas to the primary solid material was 1:1.1, and the ratio of the volumetric flow rate of the reducing gas to the mass flow rate of the primary solid material was 0.08m 3 Reducing nickel oxide in the primary solid material into metallic nickel, selectively reducing hematite into ferrous oxide and a small amount of metallic iron, and forming a reduced material after selective reduction roasting, wherein the metallization rate of nickel in the reduced material is 95.56%, and the metallization rate of iron is 6.96%;
(4) The reduction material is separated into a secondary solid material after secondary gas-solid separation, and the secondary solid material is mixed with quartz sand flux to adjust SiO in the secondary solid material 2 Molar ratio of/FeO to 0.50:1, then the mixture is put into an electric furnace for smelting, and the quartz sand contains SiO according to weight percentage 2 95 percent of loss by weight is 0.57 percent, the addition amount of the quartz sand flux is 20 percent of the total weight of the laterite-nickel ore, the smelting temperature of the secondary solid material in an electric furnace is 1550 ℃, the smelting time is 30 minutes, ferrous oxide in the secondary solid material and quartz sand are fused to form ferric silicate, metallic iron and metallic nickel are fused to form nickel molten iron, the nickel molten iron is discharged from a slag discharge port and a nickel molten iron discharge port respectively after smelting, iron silicate slag and nickel-iron alloy are formed after cooling, and the nickel-iron alloy contains 14.55 percent of Ni and 78.60 percent of TFe by weight; wherein the recovery rate of Ni is 95.37% and the recovery rate of Fe is 9.11%.
Example 2
The process is the same as in example 1, except that:
(1) The brown iron type laterite nickel ore with granularity smaller than 0.074mm accounts for 40% of the total massThe Ni grade of the ore is 1.29 percent, and the ore contains TFe 49.85 percent and SiO by weight percent 2 3.20％，Al 2 O 3 4.07%, caO 4.15%, mgO 0.73% and water 14.59%;
(2) The preheating temperature of the laterite-nickel ore in the multi-stage cyclone preheating system is 630 ℃, and the ratio of the gas volume flow of the cyclone preheating system to the mass flow of the laterite-nickel ore is 0.28m 3 The roasting temperature of a heating system of the fluidized roasting main furnace is 980 ℃;
(3) The temperature of the primary solid material in the reduction reactor for reduction reaction is 700 ℃, and the residence time of the primary solid material in the reduction reactor is 35min; h in the reducing gas entering the reduction reactor 2 And the total amount of CO and Fe in the primary solid material 2 O 3 The molar ratio of the reducing gas to the primary solid material was 1:1.4, and the ratio of the volumetric flow rate of the reducing gas to the mass flow rate of the primary solid material was 0.30m 3 /kg；
(4) The metallization rate of nickel in the reduction material is 98.01 percent, and the metallization rate of iron is 9.47 percent;
(5) Adjusting SiO in the secondary solid material 2 Molar ratio of/FeO to 0.60:1, quartz sand contains SiO by weight percent 2 96%, wherein the loss of burning is 0.33% by weight, and the addition amount of the quartz sand flux is 30% of the total weight of the laterite-nickel ore;
(6) The smelting temperature of the secondary solid material in an electric furnace is 1530 ℃, the smelting time is 50min, and the nickel-iron alloy contains 33.76 percent of Ni and 62.12 percent of TFe by mass percent; wherein the recovery rate of Ni is 97.36 percent and the recovery rate of Fe is 5.71 percent.
Example 3
The process is the same as in example 1, except that:
(1) The brown iron type laterite-nickel ore with granularity smaller than 0.074mm accounts for 30 percent of the total mass, and the Ni grade of the brown iron type laterite-nickel ore is 1.16 percent, and contains TFe 46.95 percent and SiO by weight percent 2 3.91％，Al 2 O 3 5.12%, caO 4.86%, mgO 1.27% and water 12.62%;
(2) The preheating temperature of the laterite nickel ore in a multi-stage cyclone preheating system is 550 ℃, and the laterite nickel ore is preheated by cycloneThe ratio of the gas volume flow of the system to the mass flow of the laterite-nickel ore is 0.10m 3 The roasting temperature of a fluidized roasting main furnace heating system is 950 ℃;
(3) The temperature of the primary solid material in the reduction reactor for reduction reaction is 650 ℃, and the residence time of the primary solid material in the reduction reactor is 45min; h in the reducing gas entering the reduction reactor 2 And the total amount of CO and Fe in the primary solid material 2 O 3 The molar ratio of the reducing gas to the primary solid material was 1:1.2, the ratio of the volumetric flow rate of the reducing gas to the mass flow rate of the primary solid material was 0.10m 3 /kg；
(4) The metallization rate of nickel in the reduction material is 95.76%, and the metallization rate of iron is 7.05%;
(5) Adjusting SiO in the secondary solid material 2 Molar ratio of/FeO to 0.55:1, quartz sand contains SiO by weight percent 2 94%, the burning loss is 0.70% by weight, and the addition amount of the quartz sand flux is 26% of the total weight of the laterite-nickel ore;
(6) The smelting temperature of the secondary solid material in an electric furnace is 1520 ℃, the smelting time is 70min, and the ferronickel alloy contains 27.83% of Ni and 67.28% of TFe by mass percent; wherein the recovery rate of Ni is 96.03 percent and the recovery rate of Fe is 6.40 percent.
Example 4
The process is the same as in example 1, except that:
(1) The brown iron type laterite-nickel ore with granularity smaller than 0.074mm accounts for 25 percent of the total mass, the Ni grade of the brown iron type laterite-nickel ore is 0.85 percent, and the brown iron type laterite-nickel ore contains TFe 42.75 percent and SiO by weight percent 2 4.68％，Al 2 O 3 5.71%, caO 5.35%, mgO 3.88%, and water 13.26%;
(2) The preheating temperature of the laterite-nickel ore in the multi-stage cyclone preheating system is 500 ℃, and the ratio of the gas volume flow of the cyclone preheating system to the mass flow of the laterite-nickel ore is 0.20m 3 The roasting temperature of a fluidized roasting main furnace heating system is 900 ℃;
(3) The temperature of the primary solid material in the reduction reaction in the reduction reactor is 670 ℃, and the primary solid material is in the process of reduction reactionThe residence time in the original reactor is 40min; h in the reducing gas entering the reduction reactor 2 And the total amount of CO and Fe in the primary solid material 2 O 3 The molar ratio of the reducing gas to the primary solid material was 1:1.3, the ratio of the volumetric flow rate of the reducing gas to the mass flow rate of the primary solid material was 0.15m 3 /kg；
(4) The metallization rate of nickel in the reduction material is 96.33%, and the metallization rate of iron is 8.67%;
(5) Adjusting SiO in the secondary solid material 2 Molar ratio of/FeO to 0.45:1, quartz sand contains SiO by weight percent 2 92%, wherein the burning loss is 0.81% by weight, and the addition amount of the quartz sand flux is 18% of the total weight of the laterite-nickel ore;
(6) The smelting temperature of the secondary solid material in an electric furnace is 1540 ℃, the smelting time is 40min, and the nickel-iron alloy contains 16.97% of Ni and 77.43% of TFe by mass percent; wherein the recovery rate of Ni is 95.73% and the recovery rate of Fe is 8.65%.
Example 5
The process is the same as in example 1, except that:
(1) The brown iron type laterite-nickel ore with granularity smaller than 0.074mm accounts for 35 percent of the total mass, the Ni grade of the brown iron type laterite-nickel ore is 1.10 percent, and the brown iron type laterite-nickel ore contains TFe 46.41 percent and SiO by weight percent 2 4.36％，Al 2 O 3 4.85%, caO 4.25%, mgO 1.30% and water 14.11%;
(2) The preheating temperature of the laterite-nickel ore in the multi-stage cyclone preheating system is 600 ℃, and the ratio of the gas volume flow of the cyclone preheating system to the mass flow of the laterite-nickel ore is 0.25m 3 The roasting temperature of a fluidized roasting main furnace heating system is 920 ℃;
(3) The temperature of the primary solid material in the reduction reactor for reduction reaction is 640 ℃, and the residence time of the primary solid material in the reduction reactor is 50min; h in the reducing gas entering the reduction reactor 2 And the total amount of CO and Fe in the primary solid material 2 O 3 The molar ratio of the reducing gas to the primary solid material was 1:1.2, the ratio of the volumetric flow rate of the reducing gas to the mass flow rate of the primary solid material was 0.12m 3 /kg；
(4) The metallization rate of nickel in the reduction material is 96.27%, and the metallization rate of iron is 8.15%;
(5) Adjusting SiO in the secondary solid material 2 Molar ratio of/FeO to 0.45:1, quartz sand contains SiO by weight percent 2 97%, the burning loss is 0.45% by weight, and the addition amount of the quartz sand flux is 16% of the total weight of the laterite-nickel ore;
(6) The smelting temperature of the secondary solid material in an electric furnace is 1500 ℃, the smelting time is 85min, and the ferronickel alloy contains 24.25% of Ni and 70.98% of TFe by mass percent; wherein, the recovery rate of Ni is 96.08 percent and the recovery rate of Fe is 6.67 percent.
Example 6
The process is the same as in example 1, except that:
(1) The brown iron type laterite-nickel ore with granularity smaller than 0.074mm accounts for 35 percent of the total mass, and the Ni grade of the brown iron type laterite-nickel ore is 1.22 percent, and contains TFe 47.99 percent and SiO by weight percent 2 3.38％，Al 2 O 3 4.12%, caO 4.70%, mgO 1.25% and water 14.65%;
(2) The preheating temperature of the laterite-nickel ore in the multi-stage cyclone preheating system is 650 ℃, and the ratio of the gas volume flow of the cyclone preheating system to the mass flow of the laterite-nickel ore is 0.30m 3 The roasting temperature of a fluidized roasting main furnace heating system is 1000 ℃;
(3) The temperature of the primary solid material in the reduction reactor for reduction reaction is 700 ℃, and the residence time of the primary solid material in the reduction reactor is 30min; h in the reducing gas entering the reduction reactor 2 And the total amount of CO and Fe in the primary solid material 2 O 3 The molar ratio of the reducing gas to the primary solid material was 1:1.5, the ratio of the volumetric flow rate of the reducing gas to the mass flow rate of the primary solid material was 0.35m 3 /kg；
(4) The metallization rate of nickel in the reduction material is 97.61%, and the metallization rate of iron is 9.09%;
(5) Adjusting SiO in the secondary solid material 2 Molar ratio of/FeO to 0.55:1, quartz sand contains SiO by weight percent 2 95%, the burning loss is 0.60% by weight, and the addition amount of the quartz sand flux is 27% by weight of the total weight of the laterite-nickel ore;
(6) The smelting temperature of the secondary solid material in an electric furnace is 1540 ℃, the smelting time is 60min, and the ferronickel alloy contains 31.20% of Ni and 65.49% of TFe by mass percent; wherein, the recovery rate of Ni is 96.45 percent and the recovery rate of Fe is 5.89 percent.
Example 7
The process is the same as in example 1, except that:
(1) The brown iron type laterite-nickel ore with granularity smaller than 0.074mm accounts for 30 percent of the total mass, and the Ni grade of the brown iron type laterite-nickel ore is 1.05 percent, and contains TFe 44.96 percent and SiO by weight percent 2 4.85％，Al 2 O 3 4.60%, caO 4.21%, mgO 2.66% and water 12.90%;
(2) The preheating temperature of the laterite-nickel ore in the multi-stage cyclone preheating system is 480 ℃, and the ratio of the gas volume flow of the cyclone preheating system to the mass flow of the laterite-nickel ore is 0.18m 3 The roasting temperature of a fluidized roasting main furnace heating system is 880 ℃;
(3) The temperature of the primary solid material in the reduction reactor for reduction reaction is 620 ℃, and the residence time of the primary solid material in the reduction reactor is 50min; h in the reducing gas entering the reduction reactor 2 And the total amount of CO and Fe in the primary solid material 2 O 3 The molar ratio of the reducing gas to the primary solid material was 1:1.3, the ratio of the volumetric flow rate of the reducing gas to the mass flow rate of the primary solid material was 0.20m 3 /kg；
(4) The metallization rate of nickel in the reduction material is 95.68 percent, and the metallization rate of iron is 7.77 percent;
(5) Adjusting SiO in the secondary solid material 2 Molar ratio of/FeO to 0.55:1, quartz sand contains SiO by weight percent 2 90%, wherein the loss of burning is 0.97% by weight, and the addition amount of the quartz sand flux is 24% of the total weight of the laterite-nickel ore;
(6) The smelting temperature of the secondary solid material in an electric furnace is 1520 ℃, the smelting time is 60min, and the ferronickel alloy contains 20.08% of Ni and 75.51% of TFe by mass percent; wherein the recovery rate of Ni is 95.93%, and the recovery rate of Fe is 8.66%.
Example 8
The process is the same as in example 1, except that:
(1) The brown iron type laterite-nickel ore with granularity smaller than 0.074mm accounts for 25 percent of the total mass, the Ni grade of the brown iron type laterite-nickel ore is 0.71 percent, and the brown iron type laterite-nickel ore contains 41.25 percent of TFe and SiO by weight percent 2 4.92％，Al 2 O 3 5.90%, caO 5.85%, mgO 4.66% and water 14.81%;
(2) The preheating temperature of the laterite-nickel ore in the multi-stage cyclone preheating system is 530 ℃, and the ratio of the gas volume flow of the cyclone preheating system to the mass flow of the laterite-nickel ore is 0.24m 3 The roasting temperature of a fluidized roasting main furnace heating system is 940 ℃;
(3) The temperature of the primary solid material in the reduction reactor for reduction reaction is 630 ℃, and the residence time of the primary solid material in the reduction reactor is 60min; h in the reducing gas entering the reduction reactor 2 And the total amount of CO and Fe in the primary solid material 2 O 3 The molar ratio of the reducing gas to the primary solid material was 1:1.0, the ratio of the volumetric flow rate of the reducing gas to the mass flow rate of the primary solid material was 0.08m 3 /kg；
(4) The metallization rate of nickel in the reduction material is 95.30%, and the metallization rate of iron is 5.95%;
(5) Adjusting SiO in the secondary solid material 2 Molar ratio of/FeO to 0.45:1, quartz sand contains SiO by weight percent 2 93 percent of loss by weight, wherein the addition amount of the quartz sand flux is 17 percent of the total weight of the laterite nickel ore;
(6) The smelting temperature of the secondary solid material in an electric furnace is 1540 ℃, the smelting time is 40min, and the nickel-iron alloy contains 12.10% of Ni and 84.28% of TFe by mass percent; wherein the recovery rate of Ni is 95.35% and the recovery rate of Fe is 9.71%.
Comparative example 1
The raw materials and the method steps are the same as those of the embodiment 1, and the difference is that:
when the secondary solid material enters an electric furnace for smelting, quartz sand flux is not added for regulatingThe whole silicon-iron ratio and other test conditions are the same, so that SiO in the material 2 The molar ratio of FeO is 0.10, low-melting point liquid ferric silicate cannot be formed after the electric furnace is smelted, and slag discharge is difficult. The final nickel-iron alloy contains only 5.10% of Ni by mass, the recovery rate of Ni is only 64.31%, the TFe is 82.25%, and the recovery rate of Fe is 22.90%.
Comparative example 2
The raw materials and the method steps are the same as those of the embodiment 1, and the difference is that:
the temperature of the primary solid material in the reduction reactor is 900 ℃, and H in the reducing gas entering the reduction reactor 2 And the total amount of CO and Fe in the solid material 2 O 3 The molar ratio of the nickel to the iron is 1:0.3, and other test conditions are the same, so that the metallization rate of nickel in the reduced material flowing out of the discharge hole is 98.80%, and the metallization rate of iron reaches 78.99%. The recovery rate of Ni in the finally obtained nickel-iron alloy is 95.35%, TFe is 92.33%, and the recovery rate of Fe is 72.05%, but only Ni is 3.96% by mass percent.
Claims (10)
1. The method for producing ferronickel by fluidized pre-heating and pre-reducing of limonite laterite-nickel ore through electric furnace smelting is characterized by comprising the following steps of:
(1) Finely crushing brown iron type laterite nickel ore until the granularity is less than or equal to 1.5mm, and then feeding the crushed brown iron type laterite nickel ore into a storage bin, wherein the part with the granularity less than 0.074mm accounts for 25-40% of the total mass;
(2) The laterite-nickel ore is discharged from a feed bin and then is continuously fed into a multi-stage cyclone preheating and drying system by a screw feeder, and is preheated by high-temperature flue gas to remove adsorbed water and then is fed into a fluidized roasting main furnace heating system to be dehydrated and roasted, so that goethite in the laterite-nickel ore is completely decomposed into hematite, and a dehydrated material is formed after the goethite is decomposed;
(3) The dehydrated material is subjected to primary gas-solid separation to form a primary solid material, the primary solid material enters a fluidized reduction reactor and is subjected to fluidized selective reduction roasting with reducing gas, so that nickel oxide in the primary solid material is reduced to metallic nickel, hematite is selectively reduced to ferrous oxide and a small amount of metallic iron, and the reduced material is formed after selective reduction roasting;
(4) The reduction material is subjected to secondary gas-solid separation to form a secondary solid material, the secondary solid material is mixed with quartz sand flux to adjust the silicon-iron ratio, and then the mixture is fed into an electric furnace for smelting, so that ferrous oxide in the secondary solid material and quartz sand are fused to form ferric silicate, metallic iron and metallic nickel are fused to form molten nickel, the molten nickel is discharged from a slag discharge hole and a molten nickel discharge hole respectively after smelting, and the molten nickel is cooled to form ferric silicate slag and ferronickel alloy.
2. The method for producing ferronickel by fluidized pre-heating and pre-reducing-electric furnace smelting of limonite laterite-nickel ore according to claim 1, wherein in the step (1), the limonite laterite-nickel ore has a Ni grade of 0.7-1.3%, and contains TFe 40-50% and SiO by weight percent 2 3～5％，Al 2 O 3 4 to 6 percent, 4 to 6 percent of CaO, 0.5 to 5 percent of MgO, and the water content is less than or equal to 15 percent.
3. The method for producing ferronickel by fluidized pre-reduction-electric furnace smelting of limonite laterite-nickel ore according to claim 1, wherein in the step (2), the preheating temperature of the multi-stage cyclone preheating system is 450-650 ℃, and the ratio of the volume flow of gas entering the multi-stage cyclone preheating system to the mass flow of laterite-nickel ore is 0.10-0.30 m 3 The roasting temperature of the fluidized roasting main furnace heating system is 800-1000 ℃.
4. The method for producing ferronickel by fluidized pre-reduction-electric furnace smelting of limonite laterite-nickel ore according to claim 1, wherein in the step (3), the dehydrated material is fed into a multi-stage cyclone pre-heating drying system through high-temperature flue gas after primary gas-solid separation, and the laterite-nickel ore is pre-heated.
5. The method for producing ferronickel by fluidized pre-heating and pre-reducing-electric furnace smelting of limonite laterite-nickel ore according to claim 1, wherein in the step (3), the reducing gas is cracked from coal gas or natural gas to produce H 2 Mixing CO and nitrogen.
6. The method for producing ferronickel by fluidized pre-heating and pre-reducing-electric furnace smelting of limonite laterite-nickel ore according to claim 1, wherein in the step (3), the temperature of the primary solid material in the reduction reactor is 600-700 ℃ when the reduction reaction is carried out, and the residence time of the primary solid material in the reduction reactor is 30-60 min; h in the reducing gas entering the reduction reactor 2 And the total amount of CO and Fe in the primary solid material 2 O 3 The molar ratio of (1.0-1.5) is 0.06-0.40 m 3 /kg。
7. The method for producing ferronickel by fluidized pre-heating and pre-reducing-electric furnace smelting of limonite laterite-nickel ore according to claim 1, wherein in the step (3), the metallization rate of nickel in the reduced material is more than or equal to 95%, and the metallization rate of iron is less than or equal to 10%.
8. The method for producing ferronickel by fluidized pre-heating and pre-reducing-electric furnace smelting of limonite laterite-nickel ore according to claim 1, wherein in the step (4), the surplus reducing gas after the secondary gas-solid separation of the reducing material is fed into a fluidized roasting main furnace heating system to be burnt as fuel.
9. The method for producing ferronickel by fluidized pre-heating and pre-reducing-electric furnace smelting of limonite laterite-nickel ore according to claim 1, wherein in the step (4), the silicon-iron ratio is adjusted specifically by adjusting SiO in the secondary solid material 2 The molar ratio of FeO is (0.45-0.60): 1, the addition amount of the quartz sand flux is 15-30% of the total weight of the laterite nickel ore; the smelting temperature of the secondary solid material in the electric furnace is 1500-1550 ℃ and the smelting time is 30-90 min.
10. The method for producing ferronickel by fluidized pre-reduction-electric furnace smelting of limonite laterite-nickel ore according to claim 1, wherein in the step (4), ferronickel alloy contains 10-35% of Ni and 60-85% of TFe by mass percent; wherein the recovery rate of Ni is more than or equal to 95 percent and the recovery rate of Fe is 5 to 10 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311668574.1A CN117625953A (en) | 2023-12-06 | 2023-12-06 | Method for producing ferronickel by fluidized pre-heating and pre-reducing brown iron type laterite-nickel ore through electric furnace smelting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311668574.1A CN117625953A (en) | 2023-12-06 | 2023-12-06 | Method for producing ferronickel by fluidized pre-heating and pre-reducing brown iron type laterite-nickel ore through electric furnace smelting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117625953A true CN117625953A (en) | 2024-03-01 |
Family
ID=90018012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311668574.1A Pending CN117625953A (en) | 2023-12-06 | 2023-12-06 | Method for producing ferronickel by fluidized pre-heating and pre-reducing brown iron type laterite-nickel ore through electric furnace smelting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117625953A (en) |
-
2023
- 2023-12-06 CN CN202311668574.1A patent/CN117625953A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100497670C (en) | Process of fast reducing carbon-containing red mud nickel ore pellet to enriching nickel in a bottom rotating furnace | |
| CN100478461C (en) | Combined bottom rotating furnace-electric furnace process for treating red mud nickel ore to produce ferronickel | |
| CN104087753B (en) | A kind of lateritic nickel ore self catalyzed reduction produces the method for nickelic grade ferronickel powder | |
| CN105463185B (en) | Duplex method for producing ferronickel by adopting magnetic separation-RKEF | |
| CN110093502B (en) | Method for synergistically utilizing copper smelting slag and ferromanganese ore | |
| CN110016549B (en) | Composite additive for strengthening direct reduction of laterite-nickel ore and application thereof | |
| CN101967571B (en) | Method for using red-soil nickel ore to produce nickel-iron alloy in tunnel kiln-electric furnace | |
| CN103740933A (en) | Method for producing ferro-nickel alloy from nickel oxide material | |
| CN102851490B (en) | Method for preparing high-quality calcine by fluidized reduction roasting of nickel oxide ore | |
| CN100584971C (en) | Nickel oxide ore reconcentration process | |
| CN114317954A (en) | Method for cooperatively treating and utilizing stainless steel pickling sludge and blast furnace dust | |
| CN117926027A (en) | Comprehensive utilization method of laterite nickel ore | |
| CN115261638B (en) | Method for preparing nickel iron and iron concentrate by utilizing high-magnesium laterite-nickel ore and red mud in synergy | |
| CN116926312A (en) | Method for preparing high-grade iron concentrate by treating laterite-nickel ore wet leaching slag through microwave roasting | |
| CN108796236B (en) | Method for comprehensively recycling valuable components in copper slag | |
| CN117625953A (en) | Method for producing ferronickel by fluidized pre-heating and pre-reducing brown iron type laterite-nickel ore through electric furnace smelting | |
| CN116162804A (en) | Method for producing high nickel matte and molten iron from ferronickel | |
| CN113549726B (en) | Method for strengthening gas-based solid reduction of chromite | |
| CN111826528B (en) | Method for recycling coke in process of preparing iron carbide by using blast furnace dust | |
| CN110484721B (en) | Preparation method of low-reduction pulverized vanadium titano-magnetite pellets | |
| CN109913641B (en) | Method for comprehensively utilizing high-aluminum iron ore | |
| CN101481756A (en) | Heat pressing conversion method for laterite nickel ore | |
| CN113564351A (en) | Method for preparing chromium-containing nickel iron ore oxidized pellets by using chromite and laterite-nickel ore | |
| WO2020211042A1 (en) | Method for dealuminizing and desilicating high-aluminum iron ore concentrate by using sodium roasting-water leaching | |
| CN113462891B (en) | Method for preparing stainless steel mother liquor from chromium-containing nickel iron ore pellets |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |