CN114934186A - Method for enriching nickel-cobalt metal in fayalite type furnace slag - Google Patents
Method for enriching nickel-cobalt metal in fayalite type furnace slag Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229910052840 fayalite Inorganic materials 0.000 title claims abstract description 23
- QXZUUHYBWMWJHK-UHFFFAOYSA-N [Co].[Ni] Chemical compound [Co].[Ni] QXZUUHYBWMWJHK-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 13
- 239000002184 metal Substances 0.000 title claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 84
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 59
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 45
- 229910052742 iron Inorganic materials 0.000 claims abstract description 40
- 238000002386 leaching Methods 0.000 claims abstract description 36
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 30
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 26
- 239000010941 cobalt Substances 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 230000001590 oxidative effect Effects 0.000 claims abstract description 20
- 230000009467 reduction Effects 0.000 claims abstract description 19
- 239000012141 concentrate Substances 0.000 claims abstract description 13
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000007885 magnetic separation Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- -1 cobalt metals Chemical class 0.000 claims abstract description 5
- 230000003647 oxidation Effects 0.000 claims abstract description 3
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 3
- 239000007787 solid Substances 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 abstract description 22
- 238000011946 reduction process Methods 0.000 abstract description 7
- 238000000354 decomposition reaction Methods 0.000 abstract description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 4
- 239000011707 mineral Substances 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 9
- 239000010949 copper Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 229910052814 silicon oxide Inorganic materials 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910000863 Ferronickel Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910052595 hematite Inorganic materials 0.000 description 2
- 239000011019 hematite Substances 0.000 description 2
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229910000570 Cupronickel Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229960005191 ferric oxide Drugs 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910052609 olivine Inorganic materials 0.000 description 1
- 239000010450 olivine Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/32—Alkali metal silicates
-
- 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
- C22B1/005—Preliminary treatment of scrap
-
- 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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/02—Obtaining nickel or cobalt by dry 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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/04—Obtaining nickel or cobalt by wet processes
- C22B23/0407—Leaching processes
- C22B23/0415—Leaching processes with acids or salt solutions except ammonium salts solutions
-
- 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
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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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
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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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/008—Wet processes by an alkaline or ammoniacal leaching
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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
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Abstract
The invention belongs to the technical field of mineral engineering, and discloses a method for enriching nickel and cobalt metals in fayalite type slag. The method comprises the following steps: (1) carrying out oxidizing roasting on the ground fayalite type furnace slag at 800-1000 ℃ in an oxidizing atmosphere to obtain an oxidizing roasting material; (2) carrying out reduction roasting on the oxidation roasting material in the step (1) at 1000-1100 ℃ in a reducing atmosphere to obtain reduction roasting clinker; (3) adding the reduction roasting clinker obtained in the step (2) into a sodium hydroxide solution or a sodium silicate solution for carrying out an alkaline leaching desilication reaction, and after the reaction is finished, carrying out solid-liquid separation to obtain a sodium silicate solution and desilication slag; (4) and (4) carrying out magnetic separation on the desilication slag obtained in the step (3) to obtain iron ore concentrate and nickel-cobalt-rich tailings. The method provided by the invention can effectively reduce the reduction decomposition temperature of the fayalite slag while ensuring the fayalite slag to be completely decomposed, and can avoid the enrichment of nickel and cobalt in the metallic iron phase in the reduction process.
Description
Technical Field
The invention belongs to the technical field of mineral engineering, and particularly relates to a method for enriching nickel and cobalt metals in fayalite type slag.
Background
Fayalite-type slag (including copper slag, nickel slag, etc.) is a solid waste produced in non-ferrous metal smelting processes. The main phase of the fayalite-type slag is fayalite (Fe) 2 SiO 4 ) The main chemical compositions are Fe and SiO 2 The content is respectively 35-50% and 30-40%. The nickel and cobalt content in part of furnace slag is also as high as 0.2-0.5%, and the boundary grade of nickel ore and cobalt ore mining is achieved. Since slag is a smelting product at high temperature, the occurrence state of nickel and cobalt therein is different from the enrichment thereof in natural mineral resources. Thus, selective enrichment of the slag for nickel and cobalt is difficult to achieve using conventional flotation processes.
At present, the method for recovering nickel and cobalt from slag mostly adopts a wet leaching process and a high-temperature fire reduction process. In the wet leaching process, partial iron and other metals are dissolved into the solution while nickel and cobalt are leached, so that the solution is difficult to purify, and the problems of difficult circulation of the leaching solution, equipment corrosion and the like exist.
In the high-temperature pyro-reduction process, the direct reduction decomposition temperature of the fayalite type slag is over 1200 ℃, and at the moment, nickel and cobalt in the slag enter a metallic iron phase due to overhigh reduction. In patent document CN110551902B, fayalite is directly reduced and decomposed, and nickel and cobalt inevitably enter into metallic iron phase, and then, although effective separation of iron and silicon in the reduction product is achieved by alkaline leaching, nickel and cobalt in metallic iron are difficult to be further separated. Patent document CN107227401A discloses a method for preparing copper-and ferronickel powder by co-reduction of copper slag and laterite-nickel ore, which adopts a high-temperature reduction process to reduce iron-and nickel-containing minerals into metals and form a ferronickel alloy. And the nickel is recovered by subsequent ore grinding and magnetic separation. However, nickel is enriched in metallic iron, and is difficult to separate subsequently, and can only be used as a steelmaking raw material.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for enriching nickel and cobalt in fayalite type slag, which can effectively reduce the reduction decomposition temperature of the fayalite type slag while ensuring the complete decomposition of the fayalite type slag, and avoid the enrichment of nickel and cobalt in a metal iron phase in the reduction process.
In order to realize the purpose of the invention, the specific technical scheme is as follows:
a method for enriching nickel and cobalt metals in fayalite type slag comprises the following steps:
(1) carrying out oxidizing roasting on the ground fayalite type furnace slag at 800-1000 ℃ in an oxidizing atmosphere to obtain an oxidizing roasting material;
(2) carrying out reduction roasting on the oxidation roasting material in the step (1) at 1000-1100 ℃ in a reducing atmosphere to obtain reduction roasting clinker;
(3) adding the reduction roasting clinker obtained in the step (2) into a sodium hydroxide solution or a sodium silicate solution for carrying out an alkaline leaching desilication reaction, and after the reaction is finished, carrying out solid-liquid separation to obtain a sodium silicate solution and desilication slag;
(4) and (4) carrying out magnetic separation on the desilication slag obtained in the step (3) to obtain iron ore concentrate and nickel-cobalt-rich tailings.
In the invention, firstly, in the roasting process in the oxidizing atmosphere, fayalite which is a main iron-containing phase in fayalite type slag is decomposed into hematite and silicon dioxide. After the oxidizing roasting clinker is further reduced and roasted, hematite is directly reduced into metallic iron, and silicon dioxide is converted into quartz solid solution and cristobalite solid solution. Can effectively avoid the nickel cobalt from being deeply reduced and enriched in the metallic iron in the reduction process. And then, the selective dissolution of silicon dioxide in the reduction roasting product can be realized by adopting a low-temperature alkaline leaching process, metals such as nickel, cobalt, iron and the like are enriched in leaching residues because of no reaction with alkali, and meanwhile, the monomer dissociation of metal iron particles can be realized in the process of alkaline leaching and silicon dissolving. And finally, effectively separating iron in the leached slag through weak magnetic separation, wherein nickel and cobalt are effectively enriched in tailings because the nickel and cobalt are not in iron particles.
Preferably, in the step (1), the particle size of the ground fayalite-type slag is controlled to 200 mesh or less.
Preferably, in the step (1), the oxidizing roasting time is 20-120 min.
Preferably, in step (1), oxygen or air is introduced to form an oxidizing atmosphere.
Preferably, in the step (2), the reduction roasting time is 20-120 min.
Preferably, in the step (2), carbon monoxide or hydrogen is introduced to form a reducing atmosphere.
Preferably, in the step (3), the reduced roasted clinker is ground before alkaline leaching desiliconization reaction until the particle size is controlled below 325 meshes.
Preferably, in the step (3), the concentration of the sodium hydroxide solution is 80-160 g/L, and the solid-to-solid ratio of the reaction solution is 2: 1-10: 1.
Preferably, in the step (3), the leaching temperature is 90-120 ℃, and the leaching time is 20-180 min.
Preferably, in the step (4), the magnetic separation intensity is controlled to be 500-2000 Gs.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method provided by the invention can effectively reduce the reduction decomposition temperature of the fayalite slag while ensuring the fayalite slag to be completely decomposed, and can avoid the enrichment of nickel and cobalt in the metallic iron phase in the reduction process.
(2) The method realizes the directional enrichment of valuable metals nickel and cobalt besides comprehensively recovering the main chemical components of iron and silicon in the fayalite type slag. The added value of the fayalite type slag is improved, the waste discharge is reduced, and the economic benefit is remarkable.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The iron olivine type slag used in the examples of the present invention was copper slag, and the chemical composition thereof is shown in table 1 below.
TABLE 1
Example 1
Roasting the copper slag in an oxidizing atmosphere (air) at 800 ℃ for 60min, and then roasting in a reducing atmosphere (carbon monoxide) at 1000 ℃ for 120 min; finely grinding the obtained reduction roasting clinker to be less than 74 mu m, carrying out alkaline leaching desilication reaction on the roasting clinker by adopting a sodium hydroxide solution, wherein the leaching temperature is 110 ℃, the liquid-solid ratio is 10:1, the concentration of the sodium hydroxide solution is 130g/L, the leaching time is 100min, the leaching rate of silicon oxide is 88.95% under the condition, and after the reaction is finished, carrying out solid-liquid separation to obtain a sodium silicate solution and desilication residues; and magnetically separating the desiliconized slag under the condition of magnetic field intensity of 500Gs to obtain iron ore concentrate and nickel-cobalt-rich tailings.
Through detection, the iron recovery rate in the obtained iron ore concentrate is 89.25%, the iron grade is 83.36%, and the nickel and cobalt contents in the nickel-cobalt-rich tailings are 0.46% and 1.86% respectively.
Example 2
Roasting the copper slag in an oxidizing atmosphere (air) at 1000 ℃ for 60min, and then roasting in a reducing atmosphere (carbon monoxide) at 1100 ℃ for 120 min; finely grinding the obtained roasted clinker to be less than 74 mu m, carrying out alkaline leaching desilication reaction on the roasted clinker by adopting a sodium hydroxide solution, wherein the leaching temperature is 110 ℃, the liquid-solid ratio is 10:1, the concentration of the sodium hydroxide solution is 160g/L, the leaching time is 120min, the leaching rate of silicon oxide is 92.45% under the condition, and after the reaction is finished, carrying out solid-liquid separation to obtain a sodium silicate solution and desilication residues; and magnetically separating the desiliconized slag under the condition of magnetic field intensity of 500Gs to obtain iron ore concentrate and nickel-cobalt-rich tailings.
Through detection, the iron recovery rate in the obtained iron ore concentrate is 92.56%, the iron grade is 88.56%, and the nickel and cobalt contents in the nickel-cobalt-rich tailings are 0.67% and 2.12% respectively.
Example 3
Roasting the copper slag in an oxidizing atmosphere (oxygen) at 1000 ℃ for 60min, and then roasting in a reducing atmosphere (carbon monoxide) at 1100 ℃ for 120 min; finely grinding the obtained roasted clinker to be less than 74 mu m, carrying out alkaline leaching desilication reaction on the roasted clinker by adopting a sodium hydroxide solution, wherein the leaching temperature is 120 ℃, the liquid-solid ratio is 10:1, the concentration of the sodium hydroxide solution is 160g/L, the leaching time is 120min, under the condition, the leaching rate of silicon oxide is 92.63%, and after the reaction is finished, carrying out solid-liquid separation to obtain a sodium silicate solution and desilication residues; and magnetically separating the desiliconized slag under the condition of the magnetic field intensity of 1000Gs to obtain iron ore concentrate and nickel-cobalt-rich tailings.
Through detection, the iron recovery rate in the obtained iron ore concentrate is 93.68%, the iron grade is 91.05%, and the nickel and cobalt contents in the nickel-cobalt-rich tailings are 0.77% and 2.69% respectively.
Example 4
Roasting the copper slag in an oxidizing atmosphere (oxygen) at 900 ℃ for 60min, and then transferring the copper slag into a reducing atmosphere (hydrogen) at 1000 ℃ for roasting for 120 min; finely grinding the obtained roasted clinker to be less than 74 mu m, carrying out alkaline leaching desilication reaction on the roasted clinker by adopting a sodium hydroxide solution, wherein the leaching temperature is 110 ℃, the liquid-solid ratio is 10:1, the concentration of the sodium hydroxide solution is 160g/L, the leaching time is 120min, the leaching rate of silicon oxide is 91.61% under the condition, and after the reaction is finished, carrying out solid-liquid separation to obtain a sodium silicate solution and desilication residues; and magnetically separating the desiliconized slag under the condition of magnetic field intensity of 500Gs to obtain iron ore concentrate and nickel-cobalt-rich tailings.
Through detection, the iron recovery rate in the obtained iron ore concentrate is 90.11%, the iron grade is 86.59%, and the nickel and cobalt contents in the nickel-cobalt-rich tailings are 0.41% and 1.91% respectively.
Example 5
Roasting the copper slag in an oxidizing atmosphere (oxygen) at 1000 ℃ for 60min, and then roasting in a reducing atmosphere (hydrogen) at 1200 ℃ for 120 min; finely grinding the obtained roasted clinker to be less than 74 mu m, carrying out alkaline leaching desilication reaction on the roasted clinker by adopting a sodium hydroxide solution, wherein the leaching temperature is 120 ℃, the liquid-solid ratio is 10:1, the concentration of the sodium hydroxide solution is 160g/L, the leaching time is 120min, the leaching rate of silicon oxide is 92.43% under the condition, and after the reaction is finished, carrying out solid-liquid separation to obtain a sodium silicate solution and desilication residues; and magnetically separating the desiliconized slag under the condition of the magnetic field intensity of 1000Gs to obtain iron ore concentrate and nickel-cobalt-rich tailings.
Through detection, the iron recovery rate in the obtained iron ore concentrate is 93.12%, the iron grade is 90.86%, and the nickel and cobalt contents in the nickel-cobalt-rich tailings are 0.76% and 2.89% respectively.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for enriching nickel and cobalt metals in fayalite type slag is characterized by comprising the following steps:
(1) carrying out oxidizing roasting on the ground fayalite type furnace slag at 800-1000 ℃ in an oxidizing atmosphere to obtain an oxidizing roasting material;
(2) carrying out reduction roasting on the oxidation roasting material in the step (1) at 1000-1100 ℃ in a reducing atmosphere to obtain reduction roasting clinker;
(3) adding the reduction roasting clinker obtained in the step (2) into a sodium hydroxide solution or a sodium silicate solution for carrying out an alkaline leaching desilication reaction, and after the reaction is finished, carrying out solid-liquid separation to obtain a sodium silicate solution and desilication residues;
(4) and (4) carrying out magnetic separation on the desilication slag obtained in the step (3) to obtain iron ore concentrate and nickel-cobalt-rich tailings.
2. The method according to claim 1, wherein in the step (1), the grain size of the ground fayalite-type slag is controlled to 200 mesh or less.
3. The method of claim 1, wherein in the step (1), the oxidizing roasting time is 20 to 120 min.
4. The method according to claim 1, wherein in the step (1), oxygen or air is introduced to form an oxidizing atmosphere.
5. The method of claim 1, wherein in the step (2), the reduction roasting time is 20-120 min.
6. The method of claim 1, wherein in step (2), carbon monoxide or hydrogen is introduced to form a reducing atmosphere.
7. The method of claim 1, wherein in step (3), the reduced calcined clinker is ground to a particle size of 325 mesh or less before being subjected to the alkaline leaching desilication reaction.
8. The method of claim 1, wherein in the step (3), the concentration of the sodium hydroxide solution is 80-160 g/L, and the solid-to-solid ratio of the reaction solution is 2: 1-10: 1.
9. The method according to claim 1, wherein in the step (3), the leaching temperature is 90-120 ℃ and the leaching time is 20-180 min.
10. The method of claim 1, wherein in the step (4), the magnetic separation intensity is controlled to be 500-2000 Gs.
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| CN110629015A (en) * | 2019-09-11 | 2019-12-31 | 武汉理工大学 | Iron olivine type slag desiliconization method |
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