CN106086469A - A kind of method and system utilizing lateritic nickel ore to extract nickel oxide - Google Patents
A kind of method and system utilizing lateritic nickel ore to extract nickel oxide Download PDFInfo
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- CN106086469A CN106086469A CN201610652611.3A CN201610652611A CN106086469A CN 106086469 A CN106086469 A CN 106086469A CN 201610652611 A CN201610652611 A CN 201610652611A CN 106086469 A CN106086469 A CN 106086469A
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 311
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 181
- 238000000034 method Methods 0.000 title claims abstract description 67
- 229910000480 nickel oxide Inorganic materials 0.000 title claims abstract description 47
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 title claims abstract description 47
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 98
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 90
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 71
- 239000000843 powder Substances 0.000 claims abstract description 71
- 229910000863 Ferronickel Inorganic materials 0.000 claims abstract description 64
- 230000009467 reduction Effects 0.000 claims abstract description 61
- 239000000654 additive Substances 0.000 claims abstract description 35
- 230000000996 additive effect Effects 0.000 claims abstract description 35
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 31
- 238000001354 calcination Methods 0.000 claims abstract description 21
- 238000005453 pelletization Methods 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 239000008188 pellet Substances 0.000 claims description 60
- 229910052742 iron Inorganic materials 0.000 claims description 41
- 238000007885 magnetic separation Methods 0.000 claims description 35
- 238000000227 grinding Methods 0.000 claims description 34
- 230000001590 oxidative effect Effects 0.000 claims description 23
- -1 alkali metal salt Chemical class 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 238000001465 metallisation Methods 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 7
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 38
- 238000002386 leaching Methods 0.000 abstract description 24
- 239000002994 raw material Substances 0.000 abstract description 21
- 238000011084 recovery Methods 0.000 abstract description 19
- 230000003647 oxidation Effects 0.000 abstract description 8
- 238000007254 oxidation reaction Methods 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 81
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910000008 nickel(II) carbonate Inorganic materials 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- ZULUUIKRFGGGTL-UHFFFAOYSA-L nickel(ii) carbonate Chemical compound [Ni+2].[O-]C([O-])=O ZULUUIKRFGGGTL-UHFFFAOYSA-L 0.000 description 4
- NBFQLHGCEMEQFN-UHFFFAOYSA-N N.[Ni] Chemical compound N.[Ni] NBFQLHGCEMEQFN-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000004821 distillation Methods 0.000 description 3
- 239000011504 laterite Substances 0.000 description 3
- 229910001710 laterite Inorganic materials 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- CNJLMVZFWLNOEP-UHFFFAOYSA-N 4,7,7-trimethylbicyclo[4.1.0]heptan-5-one Chemical compound O=C1C(C)CCC2C(C)(C)C12 CNJLMVZFWLNOEP-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- FWABRVJYGBOLEM-UHFFFAOYSA-N diazanium;azane;carbonate Chemical compound N.[NH4+].[NH4+].[O-]C([O-])=O FWABRVJYGBOLEM-UHFFFAOYSA-N 0.000 description 2
- 229910052840 fayalite Inorganic materials 0.000 description 2
- 229910052839 forsterite Inorganic materials 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 150000001339 alkali metal compounds Chemical class 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- WRWZNPYXEXPBAY-UHFFFAOYSA-N azane cobalt Chemical class N.[Co] WRWZNPYXEXPBAY-UHFFFAOYSA-N 0.000 description 1
- QYTBWVFCSVDTEC-UHFFFAOYSA-N azane;iron Chemical class N.[Fe] QYTBWVFCSVDTEC-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- FMQXRRZIHURSLR-UHFFFAOYSA-N dioxido(oxo)silane;nickel(2+) Chemical compound [Ni+2].[O-][Si]([O-])=O FMQXRRZIHURSLR-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- WWNBZGLDODTKEM-UHFFFAOYSA-N sulfanylidenenickel Chemical compound [Ni]=S WWNBZGLDODTKEM-UHFFFAOYSA-N 0.000 description 1
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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/04—Obtaining nickel or cobalt by wet processes
- C22B23/0407—Leaching processes
- C22B23/0446—Leaching processes with an ammoniacal liquor or with a hydroxide of an alkali or alkaline-earth metal
-
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention discloses a kind of method and system utilizing lateritic nickel ore to extract nickel oxide.Said method comprising the steps of: lateritic nickel ore, reducing agent and additive are mixed by (1), carry out pelletizing process, obtain mixing pelletizing；(2) carry out mixing pelletizing reducing, mill ore magnetic selection processes, and obtains ferronickel powder and tailings；(3) ferronickel powder is selectively oxidized roasting, obtains product of roasting；(4) product of roasting is carried out ammonia leaching ammonia still process calcination processing and obtains nickel oxide product.Described system includes mixed pelletizing device, reduction apparatus, mill ore magnetic selection device, calciner and the ammonia leaching ammonia still process calciner plant being sequentially connected with.The present invention is using low nickel minerals as raw material, by nickel being carried out drastic reduction in the direct-reduction of early stage, the ferronickel powder obtained obtains the product of roasting of ferrum oxide and elemental nickel again through selective oxidation roasting, product of roasting uses wet treatment to obtain the nickel oxide product of high added value, and nickel recovery is up to more than 90%.
Description
Technical Field
The invention belongs to the field of extraction of nonferrous metals, and particularly relates to a method and a system for extracting nickel oxide by using laterite nickel ore.
Background
In recent years, with the exhaustion of high-grade nickel sulfide ores and the rapid development of domestic stainless steel industry, low-grade laterite-nickel ores become main raw materials for producing ferronickel products. The wet treatment of laterite-nickel ore begins in 40 th 20 th century, the ammonia leaching process is adopted at the earliest, and the process is invented by professor Caron and is also called Caron process. The basic process of the process is reduction roasting-ammonia leaching, and the purpose of the reduction roasting is to maximize nickel silicate and nickel oxide in the laterite-nickel oreReducing into metal to a large extent, and simultaneously controlling the reducing conditions to reduce most of iron into Fe3O4Only a small part of the iron is reduced to metallic iron, and NH is used for calcining3And CO2Metallic nickel and cobalt are converted into nickel-ammonia and cobalt-ammonia complexes to enter a solution, metallic iron also generates iron-ammonia complexes to enter the solution, then ferric hydroxide precipitates are generated through oxidation and hydrolysis and separated from an ammonia leaching solution, the ammonia leaching solution is subjected to ammonia distillation to obtain basic nickel carbonate, and then the basic nickel carbonate is calcined to obtain NiO. NiO can be sold as a product, and can also be reduced by hydrogen to obtain metallic nickel. The process has the disadvantage of low nickel recovery rate, because the reduction of iron into a metallic state is ensured as little as possible when the laterite-nickel ore is reduced, and because the reduction of iron has a promoting effect on the aggregation and growth of nickel, the control of the step can cause the loss of a large amount of nickel, so that the nickel recovery rate of the whole process is low (the nickel recovery rate is generally below 75%). So far, only a few factories in the world adopt the method to treat the laterite-nickel ore, and few new factories adopt the ammonia leaching process for more than thirty years.
The fire method for processing the laterite-nickel ore is the mainstream process at present, wherein reduction roasting-grinding magnetic separation has become a hot point of research. The method is characterized in that laterite-nickel ore is used as a raw material, coal powder is used as a reducing agent, nickel in the ore is completely reduced into metallic nickel by adopting direct reduction equipment under a high-temperature condition, iron is partially reduced into metallic iron according to the carbon content, and then the metallic iron is enriched into nickel-iron powder through magnetic separation. At present, the ferronickel powder has no large-scale industrial application, and the research is only limited on the level that the briquette is used as the raw material for converter steelmaking or the ferronickel powder obtained by melting treatment is used as the raw material for smelting stainless steel, and the added value of the product is not high. If the nickel is extracted by treating the ferronickel powder by the ammonia leaching process, unlike the reduction calcine of the Caron process, the iron in the ferronickel powder exists almost completely in the form of metallic iron, and a large amount of ammonia leaching agent is consumed in the leaching process, so that the leaching of nickel is difficult.
Therefore, the existing laterite-nickel ore processing technology needs to be further improved.
Disclosure of Invention
In order to solve the problems of low nickel recovery rate in the wet ammonia leaching treatment of the laterite-nickel ore and low utilization value of ferronickel powder which is a technical product of the pyrometallurgical treatment of the laterite-nickel ore in the prior art, the invention provides a method and a system for treating the laterite-nickel ore3O4And the metal nickel is not oxidized during the selective oxidizing roasting, and the roasted product is subjected to the existing mature ammonia leaching-ammonia evaporation-roasting process to obtain a nickel oxide product.
In one aspect of the invention, the invention provides a method for extracting nickel oxide from laterite-nickel ore, which comprises the following steps:
(1) mixing the laterite-nickel ore, a reducing agent and an additive, and performing pelletizing treatment to obtain mixed pellets;
(2) carrying out reduction and ore grinding magnetic separation treatment on the mixed pellets to obtain ferronickel powder and tailings;
(3) the ferronickel powder is selectively oxidized and roasted to oxidize metallic iron into Fe3O4The metallic nickel is not oxidized to obtain a roasted product;
(4) and (3) carrying out ammonia leaching-ammonia evaporation-calcination treatment on the roasted product to obtain a nickel oxide product.
Therefore, according to the method for extracting nickel oxide from laterite-nickel ore, nickel oxide can be effectively extracted from laterite-nickel ore by a fire-wet process combined process, and the nickel recovery rate is up to more than 90% after the whole operation process.
In addition, the method for extracting nickel oxide by using the laterite-nickel ore according to the embodiment of the invention also has the following additional technical characteristics:
in some embodiments of the present invention, in step (1), the additive is at least one selected from the group consisting of alkali metal oxides, alkali metal salts, alkaline earth metal oxides, and alkaline earth metal salts.
In some embodiments of the invention, in step (1), the laterite-nickel ore: reducing agent: the mass ratio of the additive to the additive is 100: 5-25: 3 to 15.
In some embodiments of the invention, in the step (2), the reduction temperature is controlled to 1250-1320 ℃, and the reduction time is 20-40 min, so that the metallization rate of the iron of the mixed pellets after reduction is 50-60%, thereby ensuring that all nickel in the laterite-nickel ore is reduced to a metallic state; on the other hand, a part of iron in the form of FeO can be controlled to exist in the ore grinding magnetic separation tailings to be separated from the ferronickel powder, so that the subsequent material handling capacity is reduced.
In some embodiments of the invention, in the step (3), the roasting temperature is controlled to be 300-. Thereby, oxidation of iron to Fe can be ensured3O4While nickel is not oxidized.
The laterite-nickel ore is low nickel ore with nickel content of 0.5-3.0 wt% in the laterite-nickel ore.
In another aspect of the invention, the invention proposes a system for extracting nickel oxide from lateritic nickel ores, according to an embodiment of the invention, the system comprising:
the pelletizing device comprises a laterite-nickel ore inlet, a carbonaceous reducing agent inlet, an additive inlet and a mixed pellet outlet, and is suitable for mixing and pelletizing laterite-nickel ore, carbonaceous reducing agent and additive so as to obtain mixed pellets;
the direct reduction-grinding magnetic separation device is provided with a mixed pellet inlet, a ferronickel powder outlet and a tailings outlet, wherein the mixed pellet inlet is connected with the mixed pellet outlet and is suitable for performing direct reduction-grinding magnetic separation treatment on the mixed pellets so as to obtain ferronickel powder and tailings;
the selective oxidizing roasting device is provided with a ferronickel powder inlet, an oxidizing gas inlet and a roasted product outlet, and the ferronickel powder inlet and the ferronickel powder outlet are suitable for performing selective oxidizing roasting on the ferronickel powder so as to obtain a roasted product;
the ammonia leaching-ammonia distilling-calcining device is provided with a roasted product inlet and a nickel oxide outlet, wherein the roasted product inlet is connected with the roasted product outlet and is suitable for performing ammonia leaching, ammonia distilling and calcining treatment on the roasted product so as to obtain a nickel oxide product.
Preferably, the reduction device is any one of a rotary hearth furnace, a rotary kiln, a car bottom furnace and a tunnel kiln.
According to the invention, nickel is deeply reduced in the early reduction, ferronickel powder is obtained after grinding and dressing, roasting products of iron oxide and simple substance nickel are obtained through selective oxidizing roasting, the roasting products are treated by a wet method to obtain a nickel oxide product with high added value, and the recovery rate of nickel is up to more than 90%; meanwhile, the low-grade laterite-nickel ore is used as a raw material, so that high-purity nickel can be prepared, the raw material source of nickel production is widened, and the raw material cost is obviously reduced; the invention uses alkali metal compound or alkaline earth metal oxide as additive, which can reduce the lowest reduction temperature, greatly improve the reduction condition of the laterite-nickel ore and improve the reduction of nickel.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic flow diagram of a method for extracting nickel oxide from lateritic nickel ores according to one embodiment of the present invention;
fig. 2 is a schematic structural diagram of a system for extracting nickel oxide by utilizing laterite nickel ore according to one embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In one aspect of the invention, the invention provides a method for extracting nickel oxide by using laterite nickel ore. According to an embodiment of the invention, the method comprises:
(1) mixing the laterite-nickel ore, a reducing agent and an additive, and performing pelletizing treatment to obtain mixed pellets;
(2) carrying out reduction and ore grinding magnetic separation treatment on the mixed pellets to obtain ferronickel powder and tailings;
(3) carrying out selective oxidizing roasting on the ferronickel powder to obtain a roasted product;
(4) and carrying out ammonia leaching-ammonia evaporation-calcination treatment on the roasted product to obtain a nickel oxide product.
The inventor finds that firstly, the laterite-nickel ore is firstly subjected to direct reduction-grindingThe nickel-iron powder is obtained by selection treatment, and because the iron in the nickel-iron powder mainly exists in a metal state, the iron is not suitable for ammonia leaching in the subsequent process; then, after the ferronickel powder is selectively oxidized, the iron is selectively oxidized into Fe3O4Nickel is not oxidized, thereby obtaining a roasted product; and finally, obtaining a nickel oxide product by utilizing the existing mature ammonia leaching-ammonia steaming-calcining process of the roasted product. Compared with the prior art, on one hand, the laterite-nickel ore is processed by a wet method to obtain a nickel oxide product with high added value. On the other hand, the nickel recovery rate of the whole process is high and can reach more than 90 percent, while the nickel recovery rate of the reduction roasting-ammonia leaching process of the laterite-nickel ore in the prior art is less than 75 percent, and the technical innovation point of the invention is that the nickel can be deeply reduced in the early direct reduction.
The method for extracting nickel oxide by using the laterite-nickel ore according to the embodiment of the invention is described in detail with reference to fig. 1. According to an embodiment of the invention, the method comprises:
s100: mixing laterite-nickel ore, carbonaceous reducing agent and additive for pelletizing.
According to the embodiment of the invention, the laterite-nickel ore, the carbonaceous reducing agent and the additive are mixed and pelletized, so that the mixed pellets can be obtained.
According to an embodiment of the invention, the mixing ratio of the lateritic nickel ore, the carbonaceous reducing agent and the additive is not particularly limited, and can be selected by a person skilled in the art according to actual needs, and according to a specific embodiment of the invention, the lateritic nickel ore, the carbonaceous reducing agent and the additive can be mixed according to the mass ratio of 100: 5-25: 3-15. The amount of the carbonaceous reducing agent added is not preferably less than 5% by weight, but if the amount is less than this, the effect of reducing nickel is impaired, and the recovery rate of nickel is lowered. The addition amount of the carbonaceous reducing agent is not higher than 25 weight percent, and on the one hand, the technical and economic indexes of nickel cannot be improved, coal resource waste is caused, and the production cost is increased; on the other hand, excessive iron is reduced into the ferronickel powder, and burden is brought to the subsequent selective oxidation of the ferronickel powder. The additive is used for assisting the reduction of nickel in the laterite-nickel ore, and the reduction effect of the nickel is reduced by using too high or too low an amount in tests. Specifically, the lateritic nickel ore, the carbonaceous reducing agent and the additive are crushed in advance before the lateritic nickel ore, the carbonaceous reducing agent and the additive are mixed.
According to another embodiment of the invention, the content of nickel in the laterite-nickel ore is not particularly limited, and can be selected by a person skilled in the art according to actual needs, and according to the specific embodiment of the invention, the content of nickel in the laterite-nickel ore is 0.5-3.0 wt%. Therefore, in order to obtain high-purity nickel in the conventional synthesis process, nickel ore with high nickel content is generally required, so that the raw material production cost is high, and the nickel ore is not easy to purchase, the requirement threshold for the nickel grade in the nickel ore is low, and the high-purity nickel can be prepared by adopting the laterite-nickel ore with the nickel content of only 0.5-3.0 wt% as the raw material for preparing the nickel, so that the raw material source for nickel production is widened, and the raw material cost is obviously reduced.
According to still another embodiment of the present invention, the specific type of the additive is not particularly limited and may be selected by those skilled in the art according to actual needs, and according to a specific embodiment of the present invention, the additive may be at least one selected from the group consisting of alkali metal oxides, alkali metal salts, alkaline earth metal oxides, and alkaline earth metal salts. The alkali metal or alkaline earth metal oxide in the additive can displace NiO from forsterite or fayalite to improve the activity of NiO and reduce the lowest reduction temperature, so that the reduction condition of the laterite-nickel ore is greatly improved, and the reduction of nickel is improved.
S200: and carrying out direct reduction-ore grinding magnetic separation treatment on the mixed pellets.
According to the embodiment of the invention, the mixed pellets are subjected to direct reduction-ore grinding magnetic separation treatment, so that ferronickel powder and tailings can be obtained.
According to an embodiment of the present invention, the direct reduction-ore grinding magnetic separation treatment of the mixed pellets may be performed using a combination of a direct reduction apparatus and an ore grinding magnetic separation apparatus, and according to a specific embodiment of the present invention, the reduction apparatus may be selected from any one of a rotary hearth furnace, a rotary kiln, a car hearth furnace, and a tunnel kiln. It should be noted that, the conditions of the direct reduction and the ore grinding magnetic separation treatment can be selected by those skilled in the art according to actual needs.
According to one embodiment of the invention, the metallization rate of iron of the mixed pellets after direct reduction is 50-60%, so that on one hand, the nickel in the laterite-nickel ore can be completely reduced to be in a metallic state; on the other hand, a part of iron in the form of FeO can be controlled to exist in the ore grinding magnetic separation tailings to be separated from the ferronickel powder, so that the subsequent material handling capacity is reduced.
S300: and carrying out selective oxidizing roasting on the ferronickel powder.
According to the embodiment of the invention, ferronickel powder is subjected to selective oxidative roasting, so that a roasted product can be obtained. The inventors have found that selective oxidizing roasting of ferronickel powder can oxidize iron to Fe by utilizing the difference in affinity of iron and nickel for oxygen3O4While nickel is not oxidized, and Fe in the subsequent ammonia leaching process3O4Does not react with ammonia, thus greatly reducing the consumption of ammonia. It should be noted that, the selective oxidizing roasting conditions can be selected by those skilled in the art according to actual needs. According to the embodiment of the invention, the mass content of the metal iron in the roasted product is less than 5%, and the proportion of the metal nickel in the total nickel is more than 95%, so that the oxidation of iron into Fe can be ensured3O4While nickel is not oxidized.
S400: subjecting the roasted product to ammonia leaching-ammonia evaporation-calcination treatment
According to the embodiment of the invention, the roasted product is subjected to ammonia leaching-ammonia evaporation-calcination treatment, so that a nickel oxide product and magnetic tailings can be obtained. In the step, specifically, firstly, the roasted product is leached in ammonia-ammonium carbonate solution, and oxidizing gas is blown into the solution at the same time, so that the nickel in the roasted product and ammonia are subjected to a complex reaction to generate a nickel ammonia complex Ni (NH)3)6 2+While the iron and gangue remain in solution and are magneticIn the leached residue, ammonia distillation operation is carried out after leaching is finished to produce basic nickel carbonate Ni (OH)2·NiCO3And finally calcining to obtain a nickel oxide NiO product. It should be noted that the ammonia leaching-ammonia distilling-calcining conditions can be selected by those skilled in the art according to actual needs.
Therefore, according to the method for extracting nickel oxide from laterite-nickel ore, provided by the embodiment of the invention, the laterite-nickel ore can be effectively utilized to extract nickel oxide by a fire-wet process combined process, and the nickel recovery rate in the whole process is high (> 90%).
In another aspect of the invention, the invention provides a system for extracting nickel oxide from laterite-nickel ore. According to an embodiment of the invention, the system comprises: the pelletizing device comprises a laterite-nickel ore inlet, a carbonaceous reducing agent inlet, an additive inlet and a mixed pellet outlet, and is suitable for mixing and pelletizing laterite-nickel ore, carbonaceous reducing agent and additive so as to obtain mixed pellets; the direct reduction-grinding magnetic separation device is provided with a mixed pellet inlet, a ferronickel powder outlet and a tailings outlet, wherein the mixed pellet inlet is connected with the mixed pellet outlet and is suitable for performing direct reduction-grinding magnetic separation treatment on the mixed pellets so as to obtain ferronickel powder and tailings; the selective oxidizing roasting device is provided with a ferronickel powder inlet, an oxidizing gas inlet and a roasted product outlet, wherein the ferronickel powder inlet is connected with the ferronickel powder outlet and is suitable for performing selective oxidizing roasting on the ferronickel powder so as to obtain a roasted product; the ammonia leaching-ammonia distilling-calcining device is provided with a roasted product inlet and a nickel oxide outlet, wherein the roasted product inlet is connected with the roasted product outlet and is suitable for performing ammonia leaching, ammonia distilling and calcining treatment on the roasted product so as to obtain a nickel oxide product.
The inventor finds that firstly, laterite-nickel ore is firstly subjected to direct reduction-grinding magnetic separation treatment to obtain ferronickel powder, and because iron in the ferronickel powder mainly exists in a metallic state, the ferronickel powder is not suitable for ammonia leaching; then, willAfter the ferronickel powder is selectively oxidized, the iron is selectively oxidized into Fe3O4Nickel is not oxidized, thereby obtaining a roasted product; and finally, obtaining a nickel oxide product by utilizing the existing mature ammonia leaching-ammonia steaming-calcining process of the roasted product. Compared with the prior art, on one hand, the nickel-iron powder is treated by a wet method to obtain a nickel oxide product with high added value, and the prior art only carries out direct briquetting treatment on the nickel-iron powder or continuously melts the nickel-iron powder into the nickel-iron powder to be used as a raw material for continuously smelting stainless steel. On the other hand, the nickel recovery rate of the whole process is high and can reach more than 90 percent, while the nickel recovery rate of the reduction roasting-ammonia leaching process of the laterite-nickel ore in the prior art is less than 75 percent, and the technical innovation point of the invention is that the nickel can be deeply reduced in the early direct reduction.
The system for extracting nickel oxide by using the lateritic nickel ore according to the embodiment of the present invention will be described in detail with reference to fig. 2. According to an embodiment of the invention, the system comprises:
hybrid pelletizing apparatus 100: according to the embodiment of the invention, the mixed pelletizing device 100 has a laterite-nickel ore inlet 101, a carbonaceous reducing agent inlet 102, an additive inlet 103 and a mixed pellet outlet 104, and is adapted so that mixed pellets can be obtained thereby.
According to an embodiment of the invention, the mixing ratio of the lateritic nickel ore, the carbonaceous reducing agent and the additive is not particularly limited, and can be selected by a person skilled in the art according to actual needs, and according to a specific embodiment of the invention, the lateritic nickel ore, the carbonaceous reducing agent and the additive can be mixed according to the mass ratio of 100: 5-25: 3-15. The amount of the carbonaceous reducing agent added is not preferably less than 5% by weight, but if the amount is less than this, the effect of reducing nickel is impaired, and the recovery rate of nickel is lowered. The addition amount of the carbonaceous reducing agent is not higher than 25 weight percent, and on the one hand, the technical and economic indexes of nickel cannot be improved, coal resource waste is caused, and the production cost is increased; on the other hand, excessive iron is reduced into the ferronickel powder, and burden is brought to the subsequent selective oxidation of the ferronickel powder. The additive is used for assisting the reduction of nickel in the laterite-nickel ore, and the reduction effect of the nickel is reduced by using too high or too low an amount in tests. Specifically, the lateritic nickel ore, the carbonaceous reducing agent and the additive are crushed in advance before the lateritic nickel ore, the carbonaceous reducing agent and the additive are mixed.
According to another embodiment of the invention, the content of nickel in the laterite-nickel ore is not particularly limited, and can be selected by a person skilled in the art according to actual needs, and according to the specific embodiment of the invention, the content of nickel in the laterite-nickel ore is 0.5-3.0 wt%. Therefore, in order to obtain high-purity nickel in the conventional synthesis process, nickel ore with high nickel content is generally required, so that the raw material production cost is high, and the nickel ore is not easy to purchase, the requirement threshold for the nickel grade in the nickel ore is low, and the high-purity nickel can be prepared by adopting the laterite-nickel ore with the nickel content of only 0.5-3.0 wt% as the raw material for preparing the nickel, so that the raw material source for nickel production is widened, and the raw material cost is obviously reduced.
According to still another embodiment of the present invention, the specific type of the additive is not particularly limited and may be selected by those skilled in the art according to actual needs, and according to a specific embodiment of the present invention, the additive may be at least one selected from the group consisting of alkali metal oxides, alkali metal salts, alkaline earth metal oxides, and alkaline earth metal salts. The alkali metal or alkaline earth metal oxide in the additive can displace NiO from forsterite or fayalite to improve the activity of NiO and reduce the lowest reduction temperature, so that the reduction condition of the laterite-nickel ore is greatly improved, and the reduction of nickel is improved.
The direct reduction-ore grinding magnetic separation device 200: according to the embodiment of the invention, the direct reduction-grinding magnetic separation device 200 is provided with a mixed pellet inlet 201, a ferronickel powder outlet 202 and a tailings outlet 203, wherein the mixed pellet inlet 201 is connected with the mixed pellet outlet 104 and is suitable for performing direct reduction-grinding magnetic separation treatment on the mixed pellets, so that ferronickel powder and tailings can be obtained.
According to an embodiment of the invention, the direct reduction-ore grinding magnetic separation treatment of the mixed pellets can be carried out by using a combined device of a direct reduction device and an ore grinding magnetic separation device, namely, a reduction product outlet of the reduction device is directly communicated with a reduction product inlet of the ore grinding magnetic separation device. According to a specific embodiment of the present invention, the reduction apparatus may be any one selected from a rotary hearth furnace, a rotary kiln, a car-bottom furnace, and a tunnel kiln. It should be noted that, the conditions of the direct reduction and the ore grinding magnetic separation treatment can be selected by those skilled in the art according to actual needs. The combined device of the direct reduction device and the ore grinding magnetic separation device is only a preferred embodiment of the invention, and a person skilled in the art can also select one of a rotary hearth furnace, a rotary kiln, a vehicle bottom furnace and a tunnel kiln as the reduction device, wherein the reduction device is provided with a mixed pellet inlet and a reduction product outlet, and the mixed pellet inlet is connected with the mixed pellet outlet. The ore grinding and magnetic separation device is provided with a reduced product inlet, a ferronickel powder outlet and a tailings outlet, wherein the reduced product inlet is connected with the reduced product outlet of the reduction device. The invention is not limited thereto.
According to one embodiment of the invention, the reduction temperature is controlled to 1250-1320 ℃, the reduction time is 20-40 min, so that the metallization rate of iron obtained by directly reducing the mixed pellets is 50-60%, and therefore, on one hand, the nickel in the laterite-nickel ore can be completely reduced to be in a metallic state; on the other hand, a part of iron in the form of FeO can be controlled to exist in the ore grinding magnetic separation tailings to be separated from the ferronickel powder, so that the subsequent material handling capacity is reduced.
The selective oxidizing roasting device 300 is provided with a ferronickel powder inlet 301, an oxidizing gas inlet 302 and a roasted product outlet 303, wherein the ferronickel powder inlet 301 is connected with the ferronickel powder outlet 202 and is suitable for performing selective oxidizing roasting on the ferronickel powder so as to obtain a roasted product. The inventors have found that selective oxidizing roasting of ferronickel powder can oxidize iron to Fe by utilizing the difference in affinity of iron and nickel for oxygen3O4While nickel is not oxidized, and Fe in the subsequent ammonia leaching process3O4Does not react with ammonia, thus greatly reducing the consumption of ammonia. It should be noted that, the selective oxidizing roasting conditions can be selected by those skilled in the art according to actual needs. According to the bookIn the embodiment of the invention, the roasting temperature is controlled to be 300-500 ℃, the oxygen concentration is 0.5-2% by volume percent, and the roasting time is 5-20min, so that the mass content of the metal iron in the roasted product is less than 5%, and the proportion of the metal nickel in the total nickel is more than 95%, thereby ensuring that the iron is oxidized into Fe3O4While nickel is not oxidized.
The ammonia leaching-ammonia distilling-calcining device 400 is provided with a roasted product inlet 401, a nickel oxide outlet 402 and a magnetic tailing outlet 403, wherein the roasted product inlet 401 is connected with the roasted product outlet 303, and the roasted product is suitable for ammonia leaching, ammonia distilling and calcining treatment on the roasted product so as to obtain a nickel oxide product. In the step, specifically, firstly, the roasted product is leached in ammonia-ammonium carbonate solution, and oxidizing gas is blown into the solution at the same time, so that the nickel in the roasted product and ammonia are subjected to a complex reaction to generate a nickel ammonia complex Ni (NH)3)6 2+And the iron and the gangue are left in the magnetic leaching residue after entering the solution, and ammonia distillation operation is carried out after the leaching is finished to produce basic nickel carbonate Ni (OH)2·NiCO3And finally calcining to obtain a nickel oxide NiO product. It should be noted that the ammonia leaching-ammonia distilling-calcining conditions can be selected by those skilled in the art according to actual needs.
Therefore, the system for extracting nickel oxide by using the laterite-nickel ore can effectively utilize the laterite-nickel ore to extract nickel oxide by a fire-wet process combined process, and the nickel recovery rate of the whole process is high (> 90%).
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Example 1
Mixing and pelletizing laterite-nickel ore (containing 3.0 percent of Ni), carbonaceous reducing agent and lime according to the mass ratio of 100:15:10 to obtain mixed pellets, heating the mixed pellets in a tunnel kiln at 1320 ℃ for 40min, reducing and roasting to obtain metallized pellets (the pellet metallization rate is 60.00%), then grinding and magnetically separating the metallized pellets to obtain ferronickel powder (containing 5.72 percent of TFe64.83%), then selectively oxidizing and roasting the ferronickel powder at 350 ℃ and the oxygen concentration of 1 percent by volume for 20min to obtain a roasted product, wherein the content of metallic iron in the roasted product is 2.38 percent, the ratio of metallic nickel to total nickel is 97.06 percent, finally performing ammonia leaching-ammonia evaporation-roasting on the roasted product to obtain a nickel oxide product and magnetic tailings, magnetically separating the magnetic tailings and then sending the iron oxide product as a raw material, and the nickel recovery rate of the whole process is 92.67 percent.
Example 2
Mixing and pelletizing laterite-nickel ore (containing 1.12% of Ni), a carbonaceous reducing agent and sodium carbonate according to the mass ratio of 100:5:5 to obtain mixed pellets, heating the mixed pellets in a rotary hearth furnace at 1300 ℃ for 20min, carrying out reduction roasting to obtain metallized pellets (the pellet metallization rate is 50.00%), then carrying out ore grinding and magnetic separation on the metallized pellets to obtain ferronickel powder (containing 3.83% of Ni and 75.83%), then carrying out selective oxidizing roasting on the ferronickel powder at 300 ℃ and the oxygen concentration of 0.5% by volume for 15min to obtain a roasted product, wherein the content of metallic iron is 4.13%, the content of metallic nickel in the roasted product is 95.08% of total nickel, finally carrying out ammonia leaching-ammonia steaming-roasting treatment on the roasted product to obtain a nickel oxide product and magnetic tailings, conveying the magnetic tailings as an iron-making raw material, and carrying out magnetic separation on the nickel in the whole process with the nickel recovery rate of 91.52%.
Example 3
Mixing and pelletizing laterite-nickel ore (containing 0.5 percent of Ni), a carbonaceous reducing agent and limestone according to the mass ratio of 100:10:15 to obtain mixed pellets, heating the mixed pellets in a rotary kiln at 1280 ℃ for 30min, carrying out reduction roasting to obtain metallized pellets (the pellet metallization rate is 53.33%), then carrying out ore grinding and magnetic separation on the metallized pellets to obtain ferronickel powder (containing 2.83 percent of Ni and 85.83 percent of TFe85), then carrying out selective oxidation roasting on the ferronickel powder at 450 ℃ and the oxygen concentration of 2 percent by volume for 10min to obtain a roasted product, wherein the content of metallic iron in the roasted product is 3.28 percent, the content of metallic nickel in the roasted product is 96.18 percent of total nickel, finally carrying out ammonia leaching-ammonia evaporation-roasting on the roasted product to obtain a nickel oxide product and magnetic tailings, carrying out magnetic separation on the magnetic tailings and then sending the obtained product as an iron-making raw material, and the nickel recovery rate of the whole.
Example 4
Mixing and pelletizing laterite-nickel ore (containing 1.82% of Ni), a carbonaceous reducing agent and barium oxide according to the mass ratio of 100:25:3 to obtain mixed pellets, heating the mixed pellets in a vehicle bottom furnace at 1250 ℃ for 30min, carrying out reduction roasting to obtain metallized pellets (the pellet metallization rate is 56.79%), then carrying out ore grinding and magnetic separation on the metallized pellets to obtain ferronickel powder (containing 6.82% of TFe65.64%), then carrying out selective oxidation roasting on the ferronickel powder at 500 ℃ and the oxygen concentration of 1.5% by volume for 5min to obtain a roasted product, wherein the content of metallic iron is 3.99%, the content of metallic nickel is 95.19% of total nickel, finally carrying out ammonia leaching-ammonia evaporation-roasting on the roasted product to obtain a nickel oxide product and magnetic tailings, conveying the magnetic tailings to serve as an iron-making raw material, and the nickel recovery rate of the whole process is 93.62%.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A method for extracting nickel oxide from laterite-nickel ore is characterized by comprising the following steps:
(1) mixing the laterite-nickel ore, a reducing agent and an additive, and performing pelletizing treatment to obtain mixed pellets;
(2) carrying out reduction and ore grinding magnetic separation treatment on the mixed pellets to obtain ferronickel powder and tailings;
(3) carrying out selective oxidizing roasting on the ferronickel powder to obtain a roasted product;
(4) and (3) carrying out ammonia leaching-ammonia evaporation-calcination treatment on the roasted product to obtain a nickel oxide product.
2. The method according to the claim 1, characterized in that the nickel content in the lateritic nickel ore is 0.5-3.0 wt%.
3. The method according to claim 1, wherein in step (1), the additive is at least one selected from the group consisting of an alkali metal oxide, an alkali metal salt, an alkaline earth metal oxide and an alkaline earth metal salt.
4. The method according to claim 1, characterized in that, in step (1), the laterite-nickel ore: reducing agent: the mass ratio of the additive to the additive is 100: 5-25: 3 to 15.
5. The method as claimed in claim 1, wherein in the step (2), the reduction temperature is controlled to 1250-1320 ℃, and the reduction time is 20-40 min, so that the metallization rate of the reduced iron of the mixed pellet is 50-60%.
6. The method as claimed in claim 1, wherein in the step (3), the roasting temperature is controlled to be 300-500 ℃, the oxygen concentration is 0.5-2% by volume percent, and the roasting time is 5-20min, so that the mass content of the metallic iron in the roasted product is less than 5%, and the proportion of the metallic nickel in the total nickel is more than 95%.
7. A system for extracting nickel oxide by using laterite-nickel ore is characterized by comprising the following steps: a mixing pelletizing device, a reduction device, an ore grinding magnetic separation device, a roasting device and an ammonia leaching-ammonia distilling-calcining device; wherein,
the mixed pelletizing device is provided with a laterite-nickel ore inlet, a reducing agent inlet, an additive inlet and a mixed pellet outlet;
the reduction device is provided with a mixed pellet inlet and a reduction product outlet, and the mixed pellet inlet is connected with the mixed pellet outlet;
the ore grinding and magnetic separation device is provided with a reduced product inlet, a ferronickel powder outlet and a tailings outlet, and the reduced product inlet is connected with the reduced product outlet;
the roasting device is provided with a ferronickel powder inlet and a roasted product outlet, and the ferronickel powder inlet is connected with the ferronickel powder outlet;
the ammonia leaching-ammonia distilling-calcining device is provided with a calcined product inlet and a nickel oxide outlet, and the calcined product inlet is connected with the calcined product outlet.
8. The system of claim 7, wherein the reduction device is any one of a rotary hearth furnace, a rotary kiln, a car bottom furnace and a tunnel kiln.
9. The system of claim 7, wherein the reduction device and the ore grinding magnetic separation device are combined.
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