CN113528810A - Method for treating mixture of laterite nickel ore leaching slag and jarosite slag and application - Google Patents
Method for treating mixture of laterite nickel ore leaching slag and jarosite slag and application Download PDFInfo
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 239000002893 slag Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 56
- 229910052935 jarosite Inorganic materials 0.000 title claims abstract description 55
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 53
- 238000002386 leaching Methods 0.000 title claims abstract description 18
- 239000011504 laterite Substances 0.000 title claims abstract description 8
- 229910001710 laterite Inorganic materials 0.000 title claims abstract description 8
- 239000000203 mixture Substances 0.000 title abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000008188 pellet Substances 0.000 claims abstract description 52
- 229910052742 iron Inorganic materials 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052751 metal Inorganic materials 0.000 claims abstract description 26
- 239000002184 metal Substances 0.000 claims abstract description 24
- 238000007885 magnetic separation Methods 0.000 claims abstract description 19
- 238000010791 quenching Methods 0.000 claims abstract description 19
- 238000000498 ball milling Methods 0.000 claims abstract description 17
- 230000000171 quenching effect Effects 0.000 claims abstract description 17
- 239000003245 coal Substances 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 15
- MKPXGEVFQSIKGE-UHFFFAOYSA-N [Mg].[Si] Chemical compound [Mg].[Si] MKPXGEVFQSIKGE-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 11
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000004064 recycling Methods 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical group [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 10
- LCPUDZUWZDSKMX-UHFFFAOYSA-K azane;hydrogen sulfate;iron(3+);sulfate;dodecahydrate Chemical compound [NH4+].O.O.O.O.O.O.O.O.O.O.O.O.[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O LCPUDZUWZDSKMX-UHFFFAOYSA-K 0.000 abstract description 8
- 150000002739 metals Chemical class 0.000 abstract description 8
- 239000000843 powder Substances 0.000 abstract description 7
- 238000000354 decomposition reaction Methods 0.000 abstract description 3
- OOIOHEBTXPTBBE-UHFFFAOYSA-N [Na].[Fe] Chemical compound [Na].[Fe] OOIOHEBTXPTBBE-UHFFFAOYSA-N 0.000 abstract description 2
- 229940037003 alum Drugs 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 description 10
- 239000011449 brick Substances 0.000 description 8
- 230000002829 reductive effect Effects 0.000 description 8
- 239000000706 filtrate Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 239000006148 magnetic separator Substances 0.000 description 5
- 238000005453 pelletization Methods 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- -1 iron and nickel Chemical class 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 235000019640 taste Nutrition 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009854 hydrometallurgy Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910001813 natrojarosite Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
-
- 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
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
-
- 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
- C22B23/02—Obtaining nickel or cobalt by dry processes
- C22B23/021—Obtaining nickel or cobalt by dry processes by reduction in solid state, e.g. by segregation 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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a method for treating a mixture of laterite-nickel ore leaching slag and jarosite slag and application thereof, wherein the method comprises the following steps: granulating, drying and roasting the jarosite slag for the first time, adding a reducing agent, and roasting for the second time to obtain pellets containing metal simple substances; the pellets containing the metal simple substance are quenched with water, ball-milled and magnetically separated to obtain iron,Nickel and silicon magnesium slag slurry. The method of the invention fully utilizes the jarosite slag generated by the sulfuric acid atmospheric pressure leaching of the laterite-nickel ore and the iron removal by the jarosite method, and utilizes the characteristic of the jarosite slag that is easy to decompose at high temperature to decompose Fe formed after decomposition2O3The iron and nickel valuable metals are recovered by using the coal powder for reduction and the water quenching ball milling magnetic separation process, the iron alum slag is decomposed into the silicon magnesium slag with stable property by using high temperature, the harmless treatment of the iron alum slag is realized, and the disposal problems of the tailings leached by the low-grade laterite nickel ore normal pressure sulfuric acid and the yellow sodium iron alum slag generated by iron removal are solved.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for treating a mixture of laterite nickel ore leaching slag and jarosite slag and application of the mixture.
Background
The laterite-nickel ore is an important way for obtaining nickel raw materials in the new energy industry at present, and is an important resource strategic field which is regarded by a plurality of enterprises. In recent years, with the rapid development of the new energy electric vehicle market, the resource development scale of the laterite-nickel ore is rapidly enlarged, the amount of slag generated by the hydrometallurgical process of the laterite-nickel ore is very large, and the comprehensive recycling of iron in the iron alum slag generated by removing iron by using an iron alum method is very necessary.
At present, two methods for smelting laterite-nickel ore by a wet method are available, wherein the limonite type laterite-nickel ore mostly adopts a high pressure acid leaching process (HPAL), the saprolite type laterite-nickel ore mostly adopts a normal pressure acid leaching process, the normal pressure acid leaching process has lower requirements on equipment and control, the investment cost is lower, the technical threshold is lower, and the method is more applied in China; however, the iron removal by the normal pressure leaching process can generate a large amount of mixture of the laterite nickel ore leaching residue and the jarosite residue, the jarosite residue is unstable in chemical property in a normal temperature environment and easy to decompose, the long-term storage can pollute the environment, and the grades of iron and nickel are not too high after the iron and nickel in the jarosite residue generated by iron removal by an jarosite method are recovered.
Therefore, the development of a method for treating the mixture of the laterite-nickel ore leaching slag and the jarosite slag and realizing comprehensive recycling is urgently needed.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. In the method, iron and nickel in the mixture of the laterite-nickel ore leaching slag and the jarosite slag (hereinafter referred to as jarosite slag) are reduced into elemental iron and elemental nickel through reduction roasting, magnetic separation recovery is facilitated, the residual recovered slag is used as a raw material for making bricks or repairing roads, comprehensive recycling of the mixture of the laterite-nickel ore leaching slag and the jarosite slag is realized, and a feasible scheme is provided for treatment of the waste slag.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for treating jarosite slag comprises the following steps:
(1) granulating, drying and roasting the jarosite slag for the first time, adding a reducing agent, and roasting for the second time to obtain pellets containing metal simple substances;
(2) performing water quenching, ball milling and magnetic separation on the pellets containing the metal simple substance to obtain iron, nickel and silicon-magnesium slag slurry; in the step (1), the temperature of the secondary roasting is 950-.
Preferably, in the step (1), the jarosite slag is obtained by removing iron from the laterite-nickel ore leaching solution by a jarosite method and then filtering.
The reaction equation is: 6Fe3++4SO4 2-+2Na++12H2O→Na2Fe6(SO4)4(OH)12↓+12H+。
Preferably, in the step (1), the jarosite slag mainly comprises jarosite (Na)2Fe6(SO4)4(OH)12) Oxides and sulfates of nickel, magnesium, silicon.
Preferably, in the step (1), the main elements of the jarosite slag comprise, by mass, 0.3-0.6% of nickel, 15-22% of iron, 8-12% of magnesium, 4-6% of silicon and 40-50% of water.
Preferably, in the step (1), the iron vitriol slag is made into 25-30mm pellets.
Preferably, in the step (1), the temperature for drying is 130-160 ℃.
Preferably, in the step (1), the temperature of the primary roasting is 750-800 ℃ and the time is 2-3 hours.
The reaction equation is: na (Na)2Fe6(SO4)4(OH)12→Na2SO4+3Fe2O3+6H2O+3SO3。
Preferably, in the step (1), the reducing agent is coal powder.
Preferably, in the step (1), the mass ratio of the reducing agent to the jarosite slag is 1: (9.5-10.5).
Preferably, in the step (1), the atmosphere of the secondary calcination is a reducing atmosphere, and the gas of the reducing atmosphere is carbon monoxide.
Preferably, in the step (1), the temperature of the secondary roasting is 950-.
The reaction equation is: 2Fe2O3+3C＝4Fe+3CO2。
2NiO+2C＝2Ni+CO2。
The secondary roasting needs to control the temperature to be not more than 1050 ℃, so that the pellets are in a semi-molten state, iron and nickel exist in the pellets in an elementary substance form, when the temperature is more than 1050 ℃, a molten state can occur, and iron and nickel parts can exist in an alloy form.
Preferably, the step (2) further comprises an operation of separating the metal simple substance from the pellets containing the metal simple substance, and recycling the obtained silicon-magnesium slag slurry.
The method comprises the steps of carrying out filter pressing dehydration on the silicon-magnesium slag slurry to obtain filter residue and filtrate, taking the filter residue to make a brick or repair a road, and returning the filtrate to the water quenching and ball milling processes for recycling.
Preferably, in the step (2), the water quenching is to quench the pellets after the secondary roasting into 2-5mm particles by using water.
Preferably, in the step (2), the particle size D80 of the ball-milled pellets is less than or equal to 150 μm.
Preferably, in the step (2), the magnetic separation is wet magnetic separation; the magnetic separation intensity is 150-400 mT.
The invention also provides the application of the method in recovering valuable metals.
Compared with the prior art, the invention has the following beneficial effects:
1. the method of the invention fully utilizes the jarosite slag generated by the sulfuric acid atmospheric pressure leaching of the laterite-nickel ore and the iron removal by the jarosite method, and utilizes the characteristic of the jarosite slag that is easy to decompose at high temperature to decompose Fe formed after decomposition2O3The iron and nickel valuable metals are recovered by using the coal powder for reduction and the water quenching ball milling magnetic separation process, the iron alum slag is decomposed into the silicon magnesium slag with stable property by using high temperature, the harmless treatment of the iron alum slag is realized, and the disposal problems of the tailings leached by the low-grade laterite nickel ore normal pressure sulfuric acid and the yellow sodium iron alum slag generated by iron removal are solved.
Drawings
The invention is further described with reference to the following figures and examples, in which:
FIG. 1 is a process flow diagram of example 1 of the present invention.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
Example 1
The method for treating jarosite slag comprises the following steps:
s1, pelletizing the jarosite slag by using a pelletizer, and drying at 150 ℃ to obtain pellets of 25-30 mm;
s2, charging the dried pellets into a furnace, roasting for 2 hours at the temperature of 750 ℃, spraying coal powder (the mass is 10 percent of the jarosite slag), and roasting for 90 minutes in a reducing carbon monoxide atmosphere at 1050 ℃ for a second time to obtain the pellets containing iron and nickel simple substances;
s3, discharging the roasted pellets, quenching the pellets with water to form water-quenched pellets of 2-5mm, adding water, ball-milling the pellets until the particle size D80 is less than or equal to 150 mu m, carrying out magnetic separation by using a wet weak magnetic separator, separating valuable metals such as iron and nickel, and the like, wherein the metal recovery rate can reach more than 90%;
and S4, dehydrating the residual silicon-magnesium slag slurry by using a plate-and-frame filter press, making bricks or building roads, and directly returning the filtrate to the water quenching and ball milling processes for recycling without treatment.
Fig. 1 is a process flow diagram of example 1 of the present invention, which can be obtained from fig. 1, wherein in the process of removing iron from a leachate obtained after leaching a lateritic nickel ore at normal pressure by using a natrojarosite method, produced jarosite slag is subjected to ball-making drying, first-stage roasting, second-stage reduction roasting, water extraction, ball milling and magnetic separation, most of iron and nickel are recovered, the remaining silicon-magnesium slag is dehydrated and can be used as a raw material for brick making or road building, and water in the process is continuously returned to the ball milling and magnetic separation processes for use.
Example 2
The method for treating jarosite slag comprises the following steps:
s1, pelletizing the jarosite slag by using a pelletizer, and drying at 150 ℃ to obtain pellets of 25-30 mm;
s2, charging the dried pellets into a furnace, roasting for 2 hours at 800 ℃, spraying pulverized coal (the mass of the pulverized coal is 10% of that of jarosite slag) into the roasted pellets, and roasting for 90 minutes in a reductive carbon monoxide atmosphere at 1000 ℃ to obtain pellets containing iron and nickel simple substances;
s3, discharging the roasted pellets, quenching the pellets with water to form water-quenched pellets of 2-5mm, adding water, ball-milling the pellets until the particle size D80 is less than or equal to 150 mu m, and carrying out magnetic separation by using a wet weak magnetic separator with the magnetic separation strength of 400mT to separate valuable metals such as iron, nickel and the like, wherein the metal recovery rate can reach more than 90%;
and S4, dehydrating the residual silicon-magnesium slag slurry by using a plate-and-frame filter press, making bricks or building roads, and directly returning the filtrate to the water quenching and ball milling processes for recycling without treatment.
Example 3
The method for treating jarosite slag comprises the following steps:
s1, pelletizing the jarosite slag by using a pelletizer, and drying at 150 ℃ to obtain pellets of 25-30 mm;
s2, charging the dried pellets into a furnace, roasting for 2 hours at 800 ℃, spraying pulverized coal (the mass of the pulverized coal is 10% of that of jarosite slag) into the roasted pellets, and roasting for 90 minutes in a reductive carbon monoxide atmosphere at 950 ℃ to obtain pellets containing iron and nickel simple substances;
s3, discharging the roasted pellets, quenching the pellets with water to form water-quenched pellets of 2-5mm, adding water, ball-milling the pellets until the particle size D80 is less than or equal to 150 mu m, and carrying out magnetic separation by using a wet weak magnetic separator with the magnetic separation strength of 400mT to obtain valuable metals such as iron, nickel and the like, wherein the recovery rate of the iron and nickel metals can reach more than 90%;
and S4, dehydrating the residual silicon-magnesium slag slurry by using a plate-and-frame filter press, making bricks or building roads, and directly returning the filtrate to the water quenching and ball milling processes for recycling without treatment.
Example 4
The method for treating jarosite slag comprises the following steps:
s1, pelletizing the jarosite slag by using a pelletizer, and drying at 150 ℃ to obtain pellets of 25-30 mm;
s2, charging the dried pellets into a furnace, roasting for 2 hours at the temperature of 750 ℃, spraying pulverized coal (the mass of the pulverized coal is 10 percent of that of jarosite slag) into the roasted pellets, and roasting for 90 minutes in a reducing carbon monoxide atmosphere at 1050 ℃ to obtain pellets containing iron and nickel simple substances;
s3, discharging the roasted pellets, quenching the pellets with water to form water-quenched pellets of 2-5mm, adding water, ball-milling the pellets until the particle size D80 is less than or equal to 150 mu m, carrying out magnetic separation by using a wet weak magnetic separator with the magnetic separation strength of 400mT, separating out valuable metals such as iron, nickel and the like, wherein the recovery rate of the iron and nickel metals can reach more than 90%;
and S4, dehydrating the residual silicon-magnesium slag slurry by using a plate-and-frame filter press, making bricks or building roads, and directly returning the filtrate to the water quenching and ball milling processes for recycling without treatment.
Comparative example 1
The method for treating the jarosite slag comprises the following steps:
s1, pelletizing the jarosite slag by using a pelletizer, and drying at 150 ℃ to obtain pellets of 25-30 mm;
s2, charging the dried pellets into a furnace, spraying coal powder (the mass is 20% of the iron vitriol slag), roasting at the temperature of 750-800 ℃ for 2 hours, and obtaining the pellets containing iron and nickel simple substances from the roasted materials;
s3, discharging the roasted pellets, quenching the pellets with water to form water-quenched pellets of 2-5mm, adding water, ball-milling the pellets to a particle size of 80-150 mu m, and carrying out magnetic separation by using a wet weak magnetic separator with the magnetic separation strength of 400mT to separate valuable metals such as iron, nickel and the like, wherein the metal recovery rate is about more than 80%;
and S4, dehydrating the residual silicon-magnesium slag slurry by using a plate-and-frame filter press, making bricks or building roads, and directly returning the filtrate to the water quenching and ball milling processes for recycling without treatment.
Comparative example 2
The difference from example 1 is that the amount of the reductant pulverized coal is reduced to 8%.
Comparative example 3
The difference from example 4 is that the temperature of the second firing is 1150 ℃.
TABLE 1 typical composition of mixture of lateritic nickel ore leaching slag and jarosite slag of examples 1-4
| Component (%) | Ni | Fe | Mg | H2O | Si |
| Content (wt.) | 0.58 | 18 | 8.6 | 48.6 | 6 |
TABLE 2
It can be seen from table 2 that the original jarosite slag as waste residue is reduced into elemental iron and elemental nickel with good taste and high recovery rate by the method of the embodiments 1-4 of the invention, and the jarosite slag is decomposed into stable-property silicomagnesium slag by high temperature, so that the innocent treatment of the jarosite slag is realized, and the disposal problems of the tailings leached by the low-grade laterite nickel ore normal pressure sulfuric acid and the jarosite slag generated by iron removal are solved. From the comparative example 1, the method can change the twice roasting in the step S2 into once roasting, and the iron alum slag is contacted with carbon monoxide formed by coal powder under the condition that most of the iron alum slag is not decomposed, so that the reduction effect is not obvious, the waste of a reducing agent is caused, the coal powder consumption is increased, and the recovery rate of iron and nickel is obviously reduced; and the decomposition of the jarosite slag can be carried out at the temperature of 750-800 ℃, the temperature does not need to be increased to 1050 ℃, if the temperature is changed into one-time roasting, the energy waste is caused, and the energy conservation is not facilitated.
From comparative example 2, it can be seen that the amount of the reducing agent fine coal in step S2 was reduced to 8%, and due to the insufficient amount of the reducing agent, a sufficient reducing atmosphere could not be generated, the reaction was slow, and the metal recovery rate was low. From comparative example 3, a molten state occurs at a temperature of more than 1050 ℃, the tastes of the elementary iron and nickel are reduced, and the metal recovery rate is low.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. A method for treating jarosite slag is characterized by comprising the following steps:
(1) granulating, drying and roasting the jarosite slag for the first time, adding a reducing agent, and roasting for the second time to obtain pellets containing metal simple substances;
(2) carrying out water quenching, wet ball milling and magnetic separation on the metal simple substance-containing pellets to obtain metal and silicon-magnesium slag slurry; in the step (1), the temperature of the secondary roasting is 950-.
2. The method according to the claim 1, wherein in the step (1), the jarosite slag is obtained by filtering the laterite nickel ore leaching solution after removing iron by a jarosite method.
3. The method according to claim 1, wherein in step (1), the main components of the jarosite slag are jarosite, nickel, magnesium, oxides and sulfates of silicon.
4. The method as claimed in claim 1, wherein the temperature of the primary calcination in step (1) is 750-800 ℃ and the time is 2-3 hours.
5. The method according to claim 1, wherein in step (1), the reducing agent is pulverized coal.
6. The method according to claim 1, wherein in the step (1), the atmosphere of the secondary calcination is a reducing atmosphere.
7. The method of claim 6, wherein the reducing atmosphere is carbon monoxide gas.
8. The method as claimed in claim 1, wherein the step (2) further comprises an operation of separating the metal elements from the pellets containing the metal elements and recycling the obtained silicon-magnesium slag slurry.
9. The method as claimed in claim 1, wherein in the step (2), the water quenching is to quench the pellets after the secondary roasting into 2-5mm particles with water.
10. Use of the method of any one of claims 1 to 9 in the treatment of jarosite slag obtained from the removal of iron from a lateritic nickel ore leach liquor.
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| PCT/CN2021/142959 WO2023273263A1 (en) | 2021-06-30 | 2021-12-30 | Method for treating mixture of laterite nickel ore leached slag and yellow sodium jarosite slag and application thereof |
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| CN115433825A (en) * | 2022-08-16 | 2022-12-06 | 湖南中邦再生资源科技有限公司 | Comprehensive recovery method of iron and sulfur in waste lithium battery |
| WO2023273263A1 (en) * | 2021-06-30 | 2023-01-05 | 广东邦普循环科技有限公司 | Method for treating mixture of laterite nickel ore leached slag and yellow sodium jarosite slag and application thereof |
| CN115849468A (en) * | 2022-10-13 | 2023-03-28 | 中国恩菲工程技术有限公司 | Method for preparing nickel sulfate from nickel-iron alloy powder |
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| CN116949282B (en) * | 2023-04-28 | 2024-02-13 | 浙江华友钴业股份有限公司 | Method and equipment for treating laterite nickel ore leaching slag |
| CN117403057B (en) * | 2023-12-14 | 2024-03-08 | 中国恩菲工程技术有限公司 | Treatment method of laterite nickel ore acid leaching slag and active material |
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| CN115433825A (en) * | 2022-08-16 | 2022-12-06 | 湖南中邦再生资源科技有限公司 | Comprehensive recovery method of iron and sulfur in waste lithium battery |
| CN115433825B (en) * | 2022-08-16 | 2023-11-07 | 湖南中邦再生资源科技有限公司 | Comprehensive recovery method of iron and sulfur in waste lithium battery |
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