CN116555586A - Method for recycling nickel from low-grade nickel silicate ore - Google Patents
Method for recycling nickel from low-grade nickel silicate ore Download PDFInfo
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- CN116555586A CN116555586A CN202310543043.3A CN202310543043A CN116555586A CN 116555586 A CN116555586 A CN 116555586A CN 202310543043 A CN202310543043 A CN 202310543043A CN 116555586 A CN116555586 A CN 116555586A
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- nickel
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- roasting
- silicate
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 54
- FMQXRRZIHURSLR-UHFFFAOYSA-N dioxido(oxo)silane;nickel(2+) Chemical compound [Ni+2].[O-][Si]([O-])=O FMQXRRZIHURSLR-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000004064 recycling Methods 0.000 title abstract description 4
- 238000002386 leaching Methods 0.000 claims abstract description 71
- 239000002131 composite material Substances 0.000 claims abstract description 29
- 239000002893 slag Substances 0.000 claims abstract description 24
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000654 additive Substances 0.000 claims abstract description 16
- 230000000996 additive effect Effects 0.000 claims abstract description 16
- 238000009837 dry grinding Methods 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 239000005708 Sodium hypochlorite Substances 0.000 claims abstract description 9
- 239000004327 boric acid Substances 0.000 claims abstract description 9
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 9
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 9
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000004317 sodium nitrate Substances 0.000 claims abstract description 9
- 235000010344 sodium nitrate Nutrition 0.000 claims abstract description 9
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000013078 crystal Substances 0.000 claims abstract description 8
- WWNBZGLDODTKEM-UHFFFAOYSA-N sulfanylidenenickel Chemical compound [Ni]=S WWNBZGLDODTKEM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 6
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 5
- 238000001556 precipitation Methods 0.000 claims abstract description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical group [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 238000005245 sintering Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract 3
- 238000000227 grinding Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- -1 fluoride ions Chemical class 0.000 claims description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 230000033116 oxidation-reduction process Effects 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 125000005619 boric acid group Chemical group 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000003746 solid phase reaction Methods 0.000 abstract description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000001802 infusion Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- WZOZCAZYAWIWQO-UHFFFAOYSA-N [Ni].[Ni]=O Chemical compound [Ni].[Ni]=O WZOZCAZYAWIWQO-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000012320 chlorinating reagent Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 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
- C22B23/005—Preliminary treatment of ores, e.g. by roasting or by the Krupp-Renn process
-
- 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
- C22B23/043—Sulfurated acids or salts thereof
-
- 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
- C22B23/0453—Treatment or purification of solutions, e.g. obtained by leaching
- C22B23/0461—Treatment or purification of solutions, e.g. obtained by leaching by chemical methods
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for recovering nickel from low-grade nickel silicate ore, which comprises the steps of dry grinding the low-grade nickel silicate ore, uniformly mixing the ore powder after dry grinding with a composite additive, carrying out crystal breaking roasting, regrinding roasting slag after roasting, carrying out acid leaching, controlling acid leaching conditions to obtain nickel leaching liquid and leaching slag, and finally carrying out hydrogen sulfide neutralization precipitation on the nickel leaching liquid to obtain nickel sulfide. According to the invention, a crystal breaking roasting process is adopted, and a composite additive consisting of boric acid and calcium fluoride is added in the roasting process, so that the nickel silicate lattice structure can be effectively destroyed, more nickel is released, the sintering melting point of the material is reduced, and the solid phase reaction of the material is promoted; the composite leaching aid consisting of sodium hypochlorite and sodium nitrate is adopted in the leaching process, so that the silicate structure is destroyed, the leaching rate of nickel is improved, and the recovery rate of nickel in the whole process is more than 70%. Therefore, the method has the characteristics of simple flow, capability of effectively recycling nickel in the low-grade nickel silicate ore, and the like.
Description
Technical Field
The invention relates to the technical field of chemical smelting treatment, in particular to a method for recycling nickel from low-grade nickel silicate ores.
Background
With the increasing exhaustion of nickel ore resources which have high utilization value and are easy to process, nickel ore resources which are difficult to process, particularly nickel silicate ore resources, are increasingly paid attention. The current method for treating nickel silicate mainly comprises ferronickel smelting, nickel matte smelting, reduction roasting-ammonia leaching method, high-pressure acid leaching method, chloridizing segregation roasting-magnetic separation method and the like, but the method for recovering nickel from low-grade nickel silicate ore is less. The first two methods are suitable for treating nickel ores with iron content of more than 30% and nickel content of more than 1%, and the recovery rate of nickel in the whole process is 70%; the reduction roasting-ammonia leaching method is suitable for treating nickel ores with the magnesium oxide content of more than 10 percent and the nickel content of about 1 percent, and the recovery rate of the nickel in the whole process is 75-80 percent; the high-pressure acid leaching is suitable for treating nickel ores with nickel grade of about 1%, and the nickel recovery rate can reach 90%, but in recent years, factories which adopt the process do not achieve better effects. The patent CN 100383259C discloses a method for recovering nickel and cobalt from nickel oxide nickel silicate ore, which comprises the steps of grinding raw ore nickel oxide ore and nickel silicate ore, adding coke powder, chlorinating agent and auxiliary agent, and then, processing the materials by adopting a chloridizing segregation roasting-magnetic separation process, and separating the products after segregation roasting by a magnetic separator to obtain nickel and cobalt bulk concentrate with the nickel recovery rate of 80-85%. The process of this patent is complicated, and the nickel grade of the nickel silicate ore treated in example 1 is high at 1.2%, and the recovery rate of nickel is 84%. The 0.14% grade nickel ore treated in example 3 was not nickel silicate ore, and the recovery was 66%. The nickel in the flotation tailings of many nickel concentrating mills at present cannot be effectively utilized, and the main reason is that the nickel in the tailings is basically nickel silicate, and the nickel grade is lower than about 0.2-0.3%. Meanwhile, part of nickel ore factories stack low-grade nickel ores with higher nickel silicate on site, so that the waste of nickel resources is caused.
In view of this, in order to improve the utilization rate of nickel resources, it is necessary to develop a technique for recovering nickel from low-grade nickel silicate ores.
Disclosure of Invention
The invention aims to solve the technical problem of providing the method for recovering nickel from the low-grade nickel silicate ore, which has simple treatment flow and can efficiently and comprehensively recover iron and copper in the iron oxide coated copper ore.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for recovering nickel from low-grade nickel silicate ore, which is characterized in that: the method comprises the following steps:
(1) Grinding: and (3) carrying out dry grinding on the low-grade nickel silicate ore to obtain dry grinding ore powder.
(2) And (3) adding the composite additive into the dry grinding powder obtained in the step (1), uniformly mixing, and then carrying out crystal breaking roasting to obtain roasting slag, wherein the dosage of the composite additive is 5-10% of the mass of the powder, the roasting temperature is 1000-1200 ℃, and the roasting time is 40-60 min.
(3) Regrinding the roasting slag obtained in the step (2) to obtain regrind roasting slag.
(4) Carrying out acid leaching on the regrind roasting slag obtained in the step (3), and controlling leaching conditions to obtain a nickel leaching solution and leaching slag, wherein the solid ratio of the leaching solution is 4:1, the leaching temperature is 40-60 ℃, the leaching time is 1-2 h, and the pH value of the leaching end point is 1.2-1.4; the leaching process is added with an infusion aid, and the infusion aid is a composite infusion aid.
(5) And (3) carrying out hydrogen sulfide neutralization precipitation on the nickel leaching solution obtained in the step (4) to obtain nickel sulfide.
The main phase of nickel in the low-grade nickel silicate ore in the step (1) is nickel silicate, the proportion of which exceeds 90 percent, and the iron content is lower. The nickel ore mainly comprises the following components: ni:0.2 to 0.3 percent, fe:7.0 to 8.0 percent of Cu:0.04 to 0.06 percent of Al 2 O 3 ：1.5～1.7％、SiO 2 :35～40％，CaO：2.0～3.0％，MgO：35.0～37.0％。
In the step (1), the grinding granularity is controlled to be-0.074 mm with the proportion of more than or equal to 90 percent.
In the step (2), the ore powder after dry grinding is evenly mixed with a composite additive, then crystal breaking roasting is carried out, the dosage of the composite additive is 5-10% of the mass of the ore powder, and the composite additive comprises the following components: 25-35% of boric acid and 65-75% of calcium fluoride, for example, 30% of boric acid and 70% of calcium fluoride, fluoride ions released by the calcium fluoride in the roasting process can effectively destroy the lattice structure of nickel silicate to release more nickel, and meanwhile, boric acid can reduce the sintering melting point of materials and promote the solid-phase reaction of the materials.
In the step (3), the grain size of the regrind of the roasting slag is controlled to be-0.045 mm with the ratio of more than or equal to 90 percent, which is beneficial to improving the leaching effect.
In step (4), the added composite leaching aid components are: 35 to 45 percent of sodium hypochlorite and 55 to 65 percent of sodium nitrate, for example, 40 percent of sodium hypochlorite and 60 percent of sodium nitrate, wherein the dosage of the composite leaching aid is 1.5 percent of the mass of the leached material, the sodium hypochlorite has stronger oxidizing property, and the sodium nitrate can generate NO with extremely high oxidation-reduction potential + 1.450 (V/SHE) is beneficial to destroying silicate structure and improving leaching rate of nickel.
Thus, the recovery rate of the whole-process nickel is more than 70%.
The invention has the advantages that: 1. the method has simple and feasible process flow, can effectively treat the low-grade nickel silicate ore, greatly improves the utilization efficiency of nickel resources, and avoids the problem that other methods are not suitable for treating the low-grade nickel silicate ore.
2. According to the invention, a crystal breaking roasting process is adopted, and a composite additive is added in the roasting process, so that the lattice structure of nickel silicate can be effectively destroyed to release more nickel, and meanwhile, the sintering melting point of the material is reduced, and the solid phase reaction of the material is promoted; the composite leaching aid is adopted in the leaching process, so that the silicate structure is favorably destroyed, the leaching rate of nickel is improved, and the recovery rate of nickel in the whole process can reach more than 70%.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further illustrated by the following specific examples in connection with fig. 1:
example 1: certain low-grade nickel silicate ore in Xinjiang is taken and treated according to the process, and the nickel ore comprises the following components in table one:
list one
The method comprises the following specific steps:
(1) Grinding: and (3) carrying out dry grinding on the low-grade nickel silicate ore, wherein the grinding granularity is controlled to be-0.074 mm and the proportion is 96.1%, so as to obtain dry grinding ore powder.
(2) Adding the dry grinding mineral powder obtained in the step (1) into a composite additive consisting of 30% boric acid and 70% calcium fluoride, uniformly mixing, and then carrying out crystal breaking roasting to obtain roasting slag, wherein the dosage of the composite additive is 10% of the mass of the mineral powder, the roasting temperature is 1200 ℃, and the roasting time is 60min.
(3) Regrinding the roasting slag obtained in the step (2), wherein the regrinding granularity is controlled to be-0.045 mm and the ratio is 93.1%, so as to obtain regrind roasting slag.
(4) Carrying out sulfuric acid leaching on the regrind roasting slag obtained in the step (3), and controlling leaching conditions to obtain a nickel leaching solution and leaching slag, wherein the solid ratio of the leaching solution is 4:1, the leaching temperature is 60 ℃, the leaching time is 2h, and the pH value of the leaching end point is 1.2; during leaching, a composite leaching aid consisting of 40% of sodium hypochlorite and 60% of sodium nitrate is added, and the dosage of the composite leaching aid is 1.5% of the mass of the leached material.
(5) And (3) carrying out hydrogen sulfide neutralization precipitation on the nickel leaching solution obtained in the step (4) to obtain nickel sulfide.
This example finally obtained nickel sulphide with a nickel recovery of 72.3%.
Example 2: the tailings of a nickel separation plant in Xinjiang are treated according to the process, and the components of the tailings are shown in the following table II:
watch II
The method comprises the following specific steps:
1) Grinding: and (3) carrying out dry grinding on the low-grade nickel silicate ore, wherein the grinding granularity is controlled to be-0.074 mm and the ratio is 91.3%, so as to obtain dry grinding ore powder.
2) Adding the dry grinding mineral powder obtained in the step 1) into a composite additive consisting of 35% boric acid and 65% calcium fluoride, uniformly mixing, and then carrying out crystal breaking roasting to obtain roasting slag, wherein the dosage of the composite additive is 5% of the mass of the mineral powder, the roasting temperature is 1100 ℃, and the roasting time is 40min.
3) Regrinding the roasting slag obtained in the step 2), wherein the regrinding granularity is controlled to be-0.045 mm and the ratio is 96.1%, and regrinding roasting slag is obtained.
4) Carrying out sulfuric acid leaching on the regrind roasting slag obtained in the step 3), and controlling leaching conditions to obtain a nickel leaching solution and leaching slag, wherein the solid ratio of the leaching solution is 4:1, the leaching temperature is 40 ℃, the leaching time is 1h, and the pH value of the leaching end point is 1.4; during leaching, a composite leaching aid consisting of 35% of sodium hypochlorite and 65% of sodium nitrate is added, and the dosage of the composite leaching aid is 1.5% of the mass of the leached material.
5) And (3) carrying out hydrogen sulfide neutralization precipitation on the nickel leaching solution obtained in the step (4) to obtain nickel sulfide.
This example finally obtained nickel sulphide with a nickel recovery of 70.9%.
The foregoing detailed description of the invention has been presented for purposes of illustration and description, but is not intended to limit the scope of the invention, i.e., the invention is not limited to the details shown and described.
Claims (8)
1. A method for recovering nickel from low-grade nickel silicate ore, which is characterized in that: the method comprises the following steps:
(1) Grinding: dry grinding is carried out on the low-grade nickel silicate ore to obtain dry grinding ore powder;
(2) Adding the dry grinding mineral powder obtained in the step (1) into a composite additive, uniformly mixing, and then carrying out crystal breaking roasting to obtain roasting slag, wherein the dosage of the composite additive is 5-10% of the mass of the mineral powder; the composite additive is a composition of boric acid and calcium fluoride, fluoride ions released by the calcium fluoride break the lattice structure of nickel silicate in the roasting process to release more nickel, and meanwhile, the sintering melting point of the material is reduced by boric acid;
(3) Regrinding the roasting slag obtained in the step (2) to obtain regrind roasting slag;
(4) Acid leaching is carried out on the regrind roasting slag obtained in the step (3), and leaching conditions are controlled to obtain nickel leaching liquid and leaching slag; during leaching, a composite leaching aid is added for leaching, the composite leaching aid is a compound of sodium hypochlorite and sodium nitrate, and NO with extremely high oxidation-reduction potential is generated through strong oxidizing property of the sodium hypochlorite and sodium nitrate + So as to be beneficial to destroying silicate structure and improving leaching rate of nickel;
(5) And (3) carrying out hydrogen sulfide neutralization precipitation on the nickel leaching solution obtained in the step (4) to obtain nickel sulfide.
2. The method for recovering nickel from low grade nickel silicate ore according to claim 1, wherein: the main phase of nickel in the low-grade nickel silicate ore in the step (1) is nickel silicate, the proportion of which exceeds 90 percent, and the iron content is lower; the nickel ore mainly comprises the following components: ni:0.2 to 0.3 percent, fe:7.0 to 8.0 percent of Cu:0.04 to 0.06 percent of Al 2 O 3 ：1.5～1.7％、SiO 2 :35～40％，CaO：2.0～3.0％，MgO：35.0～37.0％。
3. The method for recovering nickel from low grade nickel silicate ore according to claim 1, wherein: the composite additive in the step (2) comprises the following components: 25-35% of boric acid and 65-75% of calcium fluoride.
4. The method for recovering nickel from low grade nickel silicate ore according to claim 1, wherein: in the step (2), the roasting temperature is 1000-1200 ℃ and the roasting time is 40-60 min.
5. The method for recovering nickel from low grade nickel silicate ore according to claim 1, wherein: the solid ratio of the leaching solution in the step (4) is 4:1, the leaching temperature is 40-60 ℃, the leaching time is 1-2 h, and the pH value of the leaching end point is 1.2-1.4.
6. The method for recovering nickel from low grade nickel silicate ore according to claim 4, wherein: the added composite leaching aid comprises the following components: 35-45% of sodium hypochlorite and 55-65% of sodium nitrate, wherein the consumption of the composite leaching aid is 1.5% of the mass of the leaching material, so that the recovery rate of the whole-process nickel is more than 70%.
7. The method for recovering nickel from low grade nickel silicate ore according to claim 1, wherein: in the step (1), the grinding granularity is controlled to be-0.074 mm with the proportion of more than or equal to 90 percent.
8. The method for recovering nickel from low grade nickel silicate ore according to claim 1, wherein: in the step (3), the grain size of regrind of the roasting slag is controlled to be-0.045 mm with the ratio of more than or equal to 90 percent so as to improve the leaching effect.
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| CN103757200A (en) * | 2014-01-08 | 2014-04-30 | 北京矿冶研究总院 | Method for separating and enriching ferronickel from laterite-nickel ore |
| CN107574278A (en) * | 2017-07-27 | 2018-01-12 | 武汉科技大学 | A kind of method that ferronickel is prepared with lateritic nickel ore enriching nickel |
| US20210354992A1 (en) * | 2018-08-06 | 2021-11-18 | Mag One Operations Inc. | Production of fine grain magnesium oxide and fibrous amorphous silica from serpentinite mine tailings |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101225469A (en) * | 2008-02-02 | 2008-07-23 | 谢光 | Active additive for improving leaching ratio of hydrometallurgy |
| CN102676803A (en) * | 2012-06-05 | 2012-09-19 | 南京元泰环保科技有限公司 | Resource utilization method for catalytic oxidation leaching of molybdenum and nickel from molybdenum-nickel ore |
| CN103757200A (en) * | 2014-01-08 | 2014-04-30 | 北京矿冶研究总院 | Method for separating and enriching ferronickel from laterite-nickel ore |
| CN107574278A (en) * | 2017-07-27 | 2018-01-12 | 武汉科技大学 | A kind of method that ferronickel is prepared with lateritic nickel ore enriching nickel |
| US20210354992A1 (en) * | 2018-08-06 | 2021-11-18 | Mag One Operations Inc. | Production of fine grain magnesium oxide and fibrous amorphous silica from serpentinite mine tailings |
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