CN112619889A - Method for selecting copper and nickel from copper-nickel ore - Google Patents
Method for selecting copper and nickel from copper-nickel ore Download PDFInfo
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- CN112619889A CN112619889A CN202110014751.9A CN202110014751A CN112619889A CN 112619889 A CN112619889 A CN 112619889A CN 202110014751 A CN202110014751 A CN 202110014751A CN 112619889 A CN112619889 A CN 112619889A
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Abstract
The invention provides a method for selecting copper and nickel from copper-nickel ores, which adopts a flotation-magnetic separation-middling regrinding and returning flotation beneficiation flow, wherein middling regrinding feeding is concentrate swept and selected in the flotation and concentrate subjected to magnetic separation. The invention provides a method for separating copper and nickel from copper-nickel ores, which comprises the steps of firstly separating easily-floated copper-nickel-containing minerals through flotation, then separating magnetic copper-nickel-containing intergrowths through magnetic separation, and finally returning to flotation operation for recleaning through middling regrinding dissociation intergrowths, so that the recovery rate of copper and nickel is further increased, meanwhile, part of magnesium-containing gangue can be discarded in advance, the circulation amount of the magnesium-containing gangue in a flotation system is reduced, the flotation environment is improved, the recovery rate of copper and nickel is increased, and the MgO content in copper-nickel concentrates is reduced. The method has the advantages of simple process, convenient control, high separation efficiency, excellent method index and high quality of the obtained copper-nickel bulk concentrate.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to a method for selecting copper and nickel from copper-nickel ores.
Background
Nickel is an important non-ferrous metal raw material required for high and new technology development and economic construction, and is called "industrial vitamin". With the development of economic construction and steel industry, the demand of nickel is increasing, and nickel resources become poor, thin and hybrid.
In the existing copper-nickel ore dressing production, a single flotation process is usually adopted, but the recovery rate is low by adopting single flotation for copper-nickel ores with multiple copper and nickel mineral types, fine granularity and complex embedding relationship.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for selecting copper and nickel from copper-nickel ores. The method can enrich copper-nickel minerals, improve the content and recovery rate of copper and nickel in the concentrate, and reduce the cost.
The invention adopts the following technical scheme:
the invention provides a method for selecting copper and nickel from copper-nickel ores, which adopts a mineral separation process of flotation-magnetic separation-middling regrinding and returning to flotation, wherein the feeding of middling regrinding is concentrate obtained by scavenging in the flotation and concentrate obtained by magnetic separation.
By adopting the technical scheme, the easily-floated copper-nickel-containing minerals can be firstly selected through flotation, then the magnetic copper-nickel-containing intergrowth is selected through magnetic separation, and finally the middling regrinding dissociation intergrowth returns to flotation operation for recleaning, so that the copper-nickel recovery rate is further increased, part of magnesium-containing gangue can be discarded in advance, the circulation amount of the magnesium-containing gangue in a flotation system is reduced, the flotation environment is improved, the copper-nickel recovery rate is improved, and the MgO content in copper-nickel concentrate is reduced.
The method of the invention is applicable to various types of copper-nickel-containing ores, such as: the copper and nickel minerals are various, and the gangue minerals mainly comprise easily-argillized magnesium-containing minerals. The copper and nickel minerals mainly have medium-fine particle size, are relatively complex in embedding relationship, are closely symbiotic with the magnetic minerals, and even if the magnetite and the magnetic gangue minerals are finely ground (the grinding fineness reaches-0.074 mm and accounts for more than 85 percent), a considerable part of the magnetite and the magnetic gangue minerals are continuously grown with the pentlandite, the chalcopyrite and the pyrrhotite. The ore with low single flotation recovery rate is adopted, and the method has better ore dressing effect.
In one embodiment of the invention, the copper-nickel ore contains various copper minerals and nickel minerals, wherein the copper minerals comprise chalcopyrite, chalcopyrite and chalcopyrite, the nickel minerals comprise pentlandite, pentlandite and cupferronickel, the ore contains a large amount of gangue mineral serpentine which is easy to arginate, and the cleavage and fracture of the pentlandite, chalcopyrite and pyrrhotite are filled with a large amount of magnetite and magnesium-containing gangue minerals.
Further, the flotation comprises roughing, scavenging, concentrating and middling scavenging.
And carrying out raw ore grinding before the roughing to obtain ore pulp with the fineness of-0.074 mm accounting for 65-72% and the mass concentration of 20-26%.
The main flow of the invention has thicker grinding fineness, can reduce the grinding cost, and simultaneously abandons a great deal of gangue containing magnesium with coarse granularity through the flow of the invention, reduces the circulation amount of fine mud in a flotation system, improves the flotation environment and further improves the recovery rate of copper and nickel.
Preferably, in the grinding, an activating agent and an auxiliary collector are added into raw ores, so that the floatability of the copper-nickel ore is improved, and the recovery rate of the fine-grained copper-nickel ore and the intergrowth is improved.
Wherein the activating agent is selected from one or more of copper sulfate, oxalic acid, sulfuric acid, ammonium sulfate and sodium carbonate; the amount of the activating agent added is preferably 300g/t to 1000g/t in terms of the amount of ore fed.
The auxiliary collector is selected from one or more of isopropyl ethyl thiourethane, xanthate allyl and allyl thiourethane; the addition amount of the auxiliary collector is preferably 20g/t-40g/t according to the ore feeding amount.
The roughing (flotation roughing) comprises: adding a collecting agent into the ore pulp to collect copper-nickel minerals to obtain rougher concentrate and rougher tailings; the rougher tailings are used as the feed for scavenging, and the rougher concentrate is used as the feed for concentration.
Wherein the collecting agent preferably consists of at least one black powder and at least one xanthate, and the black powder comprises No. 25 black powder, No. 31 black powder, isobutyl sodium black powder and butylamine black powder; the xanthate comprises ethyl xanthate, third-grade xanthate, butyl xanthate and amyl xanthate.
More preferably, the addition amount of the collector is 180g/t-225g/t according to the ore feeding amount.
And (3) carrying out scavenging (floating scavenging) for 2-3 times, and adding a collecting agent into the fed ore to collect the copper-nickel ore substances in each scavenging process to obtain scavenged concentrate and scavenged tailings. The collecting agent preferably consists of at least one black powder and at least one xanthate, wherein the black powder comprises No. 25 black powder, No. 31 black powder, isobutyl sodium black powder and butylamine black powder; the xanthate comprises ethyl xanthate, third-grade xanthate, butyl xanthate and amyl xanthate. The collector employed in the scavenging process may be the same as or different from that employed in the rougher flotation process.
Preferably, according to an ore feeding amount, the addition amount of the collecting agent in the first scavenging process is 40-60 g/t; the addition amount of the collecting agent in the rest scavenging process is 20-40 g/t.
And (3) carrying out concentration (floating concentration) for 2-3 times, and adding a collecting agent into the feed ore for concentration in the other concentration processes except the last concentration to obtain concentrated concentrate and concentrated tailings. The collecting agent preferably consists of at least one black powder and at least one xanthate, wherein the black powder comprises No. 25 black powder, No. 31 black powder, isobutyl sodium black powder and butylamine black powder; the xanthate comprises ethyl xanthate, third-grade xanthate, butyl xanthate and amyl xanthate.
Preferably, the addition amount of the collecting agent is 5g/t-10g/t according to the ore feeding amount.
In a preferred embodiment of the invention, three scavenging and two concentrating are carried out, as follows:
primary scavenging: adding a collecting agent into the rougher tailings to collect the copper-nickel minerals to obtain primary scavenging concentrate and primary scavenging tailings; wherein the primary scavenging tailings are used as feeding for secondary scavenging, and the primary scavenging concentrate is used as part feeding for regrinding middlings;
the addition amount of the collecting agent is preferably 40g/t-60g/t according to the ore feeding amount;
secondary scavenging: adding a collecting agent into the primary scavenging tailings to collect the copper-nickel minerals to obtain secondary scavenging concentrates and secondary scavenging tailings; wherein, the secondary scavenging tailings are used as feeding for the tertiary scavenging, and the secondary scavenging concentrate is used as part feeding for regrinding middlings;
the addition amount of the collecting agent is preferably 20g/t-40g/t according to the ore feeding amount;
and (3) carrying out tertiary scavenging: adding a collecting agent into the secondary scavenged tailings to collect the copper-nickel minerals to obtain tertiary scavenged concentrate and tertiary scavenged tailings; wherein, the third scavenging tailings are used as magnetic feeding, and the third scavenging concentrate is used as part of middling regrinding feeding;
the addition amount of the collecting agent is preferably 20g/t-40g/t according to the ore feeding amount;
primary fine selection: adding a collecting agent into the rough concentration concentrate for fine concentration to obtain a first fine concentration concentrate and a first fine concentration tailing; wherein, the primary concentration concentrate is used as secondary concentration feeding, and the primary concentration tailings are used as feeding for middling scavenging;
the addition amount of the collecting agent is preferably 5g/t-10g/t according to the ore feeding amount;
secondary fine selection: adding no medicament into the primary concentration concentrate to carry out blank concentration to obtain secondary concentration concentrate and secondary concentration tailings; wherein, the secondary concentration concentrate is used as the final concentrate to provide raw materials for smelting, and the secondary concentration tailings return to the primary concentration step to form closed cycle.
The middling scavenging comprises: adding a collecting agent into the primary concentration tailings to collect the copper-nickel minerals to obtain middling scavenging concentrates and middling scavenging tailings, returning the middling scavenging concentrates to the primary concentration step to form closed cycle, and taking the middling scavenging tailings as a final tailing stockpiling tailing pond. The collecting agent preferably consists of at least one black powder and at least one xanthate, wherein the black powder comprises No. 25 black powder, No. 31 black powder, isobutyl sodium black powder and butylamine black powder; the xanthate comprises ethyl xanthate, third-grade xanthate, butyl xanthate and amyl xanthate.
Wherein the addition amount of the collecting agent is preferably 20g/t-40g/t according to the ore feeding amount.
The magnetic separation comprises low-intensity magnetic separation and high-intensity magnetic separation, wherein the feeding of the low-intensity magnetic separation is tailings of the flotation, the tailings of the low-intensity magnetic separation are used as strong-intensity magnetic separation feeding, the tailings of the high-intensity magnetic separation are stockpiled as final tailings, and concentrate of the low-intensity magnetic separation and concentrate of the high-intensity magnetic separation are used as part feeding of middling regrinding.
Preferably, the magnetic field intensity of the low-intensity magnetic separation is 119.36KA/m-238.72 KA/m.
The magnetic field intensity of the strong magnetic separation is 0.3T-0.5T.
In the middling regrinding process, an activating agent and an auxiliary collecting agent are added into ore feeding, the ore is ground until the ore pulp with the fineness of minus 0.074mm accounting for 80-85% and the mass concentration of 20-24% returns to the flotation to form closed circulation.
Wherein the activating agent is selected from one or more of copper sulfate, oxalic acid, sulfuric acid, ammonium sulfate and sodium carbonate; the amount of the activating agent added is preferably 100g/t to 300g/t in terms of the amount of ore fed.
The auxiliary collector is selected from one or more of isopropyl ethyl thiourethane, xanthate allyl and allyl thiourethane; the addition amount of the auxiliary collector is preferably 20g/t-40g/t according to the ore feeding amount.
The invention has the beneficial effects that:
the invention provides a method for separating copper and nickel from copper-nickel ores, which comprises the steps of firstly separating easily-floated copper-nickel-containing minerals through flotation, then separating magnetic copper-nickel-containing intergrowths through magnetic separation, and finally returning to flotation operation for recleaning through middling regrinding dissociation intergrowths, so that the recovery rate of copper and nickel is further increased, meanwhile, part of magnesium-containing gangue can be discarded in advance, the circulation amount of the magnesium-containing gangue in a flotation system is reduced, the flotation environment is improved, the recovery rate of copper and nickel is increased, and the MgO content in copper-nickel concentrates is reduced. The method has the advantages of simple process, convenient control, high separation efficiency, excellent method index and high quality of the obtained copper-nickel bulk concentrate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic flow chart of copper-nickel separation from copper-nickel ores provided in the embodiment of the invention;
fig. 2 is a schematic flow chart of selecting copper and nickel from the copper-nickel ore provided by the comparative example of the invention.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications. The reagents or instruments used are conventional products available from regular distributors, not indicated by the manufacturer.
Example 1
The embodiment provides a method for selecting copper and nickel from copper-nickel ores, wherein the grade of copper in the copper-nickel ores is 0.95%, and the grade of nickel in the copper-nickel ores is 0.92%.
The copper-nickel ore mainly contains valuable elements of copper and nickel, and also contains recoverable rare and precious metal such as gold, silver, platinum and palladium. The nickel minerals mainly comprise pentlandite and purothiavorite, the copper minerals mainly comprise chalcopyrite, chalcopyrite and a small amount of chalcopyrite, the other metal minerals mainly comprise pyrrhotite, pyrite, magnetite and chromite, the rare precious metal minerals mainly comprise tellurite, natural gold, argentum, bullion, telluridipalladite (platinum) palladate, arsenoplatinite and the like, and the gangue minerals mainly comprise serpentine. Copper and nickel minerals are closely associated with magnetite, and magnetite generally grows at sulfide grain boundaries.
The flow diagram of the method is shown in fig. 1, and comprises the following steps:
grinding (rough grinding): adding oxalic acid and isopropyl ethyl thionocarbamate into raw ore, and grinding the raw ore to ore pulp with the fineness of-0.074 mm accounting for 65% and the mass concentration of 26%; according to the ore feeding amount: the dosage of oxalic acid is 800g/t, and the dosage of isopropyl ethyl thiourethane is 30 g/t.
Roughing: adding copper-nickel mineral collectors of ethyl xanthate and butylamine black (in a ratio of 1:4) into the ore pulp, wherein the ratio is as follows according to the ore feeding amount: the dosage of the collecting agent is 180 g/t; stirring, and performing roughing operation to obtain roughed concentrate and roughed tailings. The roughing tailings are used as primary scavenging feeding, and the roughing concentrates are used as primary concentration feeding.
Primary scavenging: adding collecting agents of ethyl xanthate and butylamine black powder (the proportion is 1:4) into the rougher tailing pulp, and according to the selected ore amount: the dosage of the collecting agent is 60 g/t; stirring, and carrying out primary scavenging operation to obtain primary scavenging concentrate and primary scavenging tailings; the primary scavenging tailings are used as secondary scavenging feed ores, and the primary scavenging concentrate is used as part feed ores for middling regrinding.
Secondary scavenging: adding collecting agents of ethyl xanthate and butylamine black powder (the proportion is 1:4) into the ore pulp of the once scavenging tailings, wherein the collecting agents are as follows according to the ore feeding amount: the dosage of the collecting agent is 30 g/t; stirring, and carrying out secondary scavenging operation to obtain secondary scavenging concentrate and secondary scavenging tailings; the secondary scavenging tailings are used as tertiary scavenging feed, and the secondary scavenging concentrate is used as part feed for regrinding middlings.
And (3) carrying out tertiary scavenging: adding collecting agents of ethyl xanthate and butylamine black powder (the proportion is 1:4) into the ore pulp of the tailings of the secondary scavenging, wherein the ore feeding amount is as follows: the dosage of the collecting agent is 20 g/t; stirring, and carrying out three times of scavenging operation to obtain three times of scavenging concentrate and three times of scavenging tailings; and the third scavenging tailings are used for magnetic separation feeding, and the third scavenging concentrate is used for partial feeding of middling regrinding.
Primary fine selection: adding collecting agents of ethyl xanthate and butylamine black powder (the proportion is 1:4) into the roughed concentrate ore pulp, and according to the ore feeding amount: the using amount of the collecting agent is 5 g/t; stirring, and carrying out primary concentration operation to obtain primary concentrated concentrate and primary concentrated tailings; the first concentration concentrate is used as the feeding ore for the second concentration, and the first concentration tailings are used as the feeding ore for the middling scavenging.
Secondary fine selection: carrying out blank concentration on the ore pulp of the primary concentrated ore without adding a medicament to obtain secondary concentrated ore and secondary concentrated tailings; and the secondary concentration concentrate is sold as a final product, and the secondary concentration tailings return to the primary concentration step to form closed cycle.
And (3) middling scavenging: adding an ethyl xanthate and an butylamine black powder (ratio 1:4) into the ore pulp of the primary concentration tailings, wherein the ore feeding amount is as follows: the dosage of the collecting agent is 30 g/t; and stirring, carrying out middling scavenging operation to obtain middling scavenging concentrate and middling scavenging tailings, returning the middling scavenging concentrate to the primary concentration step to form closed cycle, and taking the middling scavenging tailings as a final tailing stockpiling tailing pond.
Performing low-intensity magnetic separation: the third scavenging tailings enter a magnetic roller for magnetic separation (the magnetic field intensity is 119.36KA/m), so that low-intensity magnetic separation concentrate and low-intensity magnetic separation tailings are obtained; wherein the tailings subjected to low-intensity magnetic separation are used as high-intensity magnetic separation feeding ores, and the concentrate subjected to low-intensity magnetic separation is used as part of middling regrinding feeding ores;
strong magnetic separation: and (3) carrying out magnetic separation on the tailings subjected to the low-intensity magnetic separation in a strong magnetic machine (the magnetic field intensity is 0.35T) to obtain strong magnetic separation concentrate and strong magnetic separation tailings, wherein the strong magnetic separation tailings are stockpiled as final tailings, and the strong magnetic separation concentrate is used as part of middling regrinding for ore feeding.
Regrinding middlings: adding oxalic acid and isopropyl ethyl thiourethane into ore pulp consisting of primary scavenging concentrate, secondary scavenging concentrate, tertiary scavenging concentrate, low-intensity magnetic separation concentrate and high-intensity magnetic separation concentrate, and grinding the ore pulp to ore pulp with the mass concentration of 21% and accounting for 85% of-0.074 mm. According to the selected ore amount: the dosage of oxalic acid is 200g/t, and the dosage of isopropyl ethyl thiourethane is 25 g/t; and returning the ore pulp to the roughing step after grinding to form closed cycle.
Comparative example 1
The comparative example provides a method for mineral separation of copper-nickel ores, which is different from the embodiment 1 in that a two-grinding two-separation full-flotation process flow is adopted, and a flow schematic diagram is shown in fig. 2, and the method specifically comprises the following steps:
first-stage ore grinding: grinding raw ore to ore pulp with fineness of-0.074 mm accounting for 65% and mass concentration of 26%;
first-stage rough selection: adding copper-nickel mineral collectors of ethyl xanthate and butylamine black (in a ratio of 1:4) into the ore pulp, and according to a first-stage grinding ore feeding amount: the dosage of the collecting agent is 220 g/t; stirring, and performing roughing operation to obtain roughed concentrate and roughed tailings. The rougher tailings are used as the feeding for the second-stage regrinding, and the rougher concentrate is used as the first-stage concentration feeding.
First-stage selection I: adding collecting agents of ethyl xanthate and butylamine black powder (the proportion is 1:4) into the primary roughing concentrate pulp, and according to a primary grinding ore feeding amount: the using amount of the collecting agent is 5 g/t; stirring, and carrying out first-stage concentration I operation to obtain first-stage concentration I concentrate and first-stage concentration I tailings; and the first-stage concentration I concentrate serves as the feeding part of the first-stage concentration II, and the first-stage concentration I tailings serve as the feeding part of the second-stage grinding.
First-stage concentration II: performing blank concentration on the first-stage concentration I concentrate pulp without adding a medicament to obtain first-stage concentration II concentrate and first-stage concentration II tailings; and the first-stage concentration II concentrate serves as a final product to provide a raw material for metallurgy, and the first-stage concentration II tailings return to the first-stage concentration I step to form a closed cycle.
Secondary grinding: grinding mixed ore pulp consisting of the primary roughing tailings and the first-stage concentration I tailings to ore pulp with the fineness of-0.074 mm accounting for 85% and the mass concentration of 21%;
and (3) second-stage rough selection: adding collecting agents of ethyl xanthate and butylamine black powder (the proportion is 1:4) into the second-stage ore grinding pulp, and measuring the ore feeding amount according to the first-stage ore grinding: the dosage of the collecting agent is 100 g/t; stirring, and performing secondary roughing operation to obtain secondary roughing concentrate and secondary roughing tailings; the second-stage roughing tailings are used as first scavenging feed, and the second-stage roughing concentrate is used as second-stage concentration I feed.
Primary scavenging: adding collecting agents of ethyl xanthate and butylamine black powder (the proportion is 1:4) into the second-stage roughing tailing pulp, and according to the first-stage grinding ore feeding amount: the dosage of the collecting agent is 30 g/t; stirring, and carrying out primary scavenging operation to obtain primary scavenging concentrate and primary scavenging tailings; the primary scavenging tailings are used as secondary scavenging feeding, and the primary scavenging concentrate is returned to the secondary grinding feeding step to form closed cycle.
Secondary scavenging: adding collecting agents of ethyl xanthate and butylamine black powder (the proportion is 1:4) into the ore pulp of the once scavenging tailings, and measuring the ore feeding amount according to the first-stage grinding: the dosage of the collecting agent is 20 g/t; stirring, and carrying out secondary scavenging operation to obtain secondary scavenging concentrate and secondary scavenging tailings; and the secondary scavenged tailings are taken as final tailings to be stockpiled in a tailing pond, and the secondary scavenged concentrate returns to the primary scavenged ore feeding step to form closed cycle.
Two-stage fine selection I: adding collecting agents of ethyl xanthate and butylamine black powder (ratio 1:4) into the ore pulp of the second-stage roughing concentrate, and measuring according to the ore feeding amount of the first-stage grinding: the dosage of the collecting agent is 23 g/t; stirring, and performing second-stage concentration I operation to obtain second-stage concentration I concentrate and second-stage concentration I tailings; and the tailings of the second-stage concentration I are used as second-stage fine scavenging ores, and the concentrate of the second-stage concentration I is used as second-stage fine concentration II ores.
And (4) second-stage concentration II: adding collecting agents of ethyl xanthate and butylamine black powder (ratio 1:4) into the ore pulp of the concentrate I in the second-stage concentration step, wherein the collecting agents are calculated according to the first-stage grinding ore feeding amount: the using amount of the collecting agent is 6 g/t; stirring, and performing second-stage concentration II operation to obtain second-stage concentration II concentrate and second-stage concentration II tailings; and the second-stage concentration II concentrate is used as the feed of the second-stage concentration III, and tailings of the second-stage concentration II are returned to the first-stage concentration step to form closed cycle.
Second-stage fine selection III: and (3) carrying out secondary concentration III without adding a collecting agent in the ore pulp of the secondary concentration II to obtain a secondary concentration III ore concentrate and a secondary concentration III tailing, wherein the secondary concentration III ore concentrate is used as a final product of ore dressing to provide a raw material for smelting, and the secondary concentration III tailing returns to the secondary concentration II step to form closed cycle.
Second-stage fine sweeping: adding collecting agents of ethyl xanthate and butylamine black powder (the proportion is 1:4) into the tailings of the second-stage concentration I to carry out second-stage concentration, wherein the collecting agents are as follows according to a first-stage grinding ore feeding amount: the dosage of the collecting agent is 25 g/t; stirring, and performing second-stage fine sweeping operation to obtain second-stage fine sweeping concentrate and second-stage fine sweeping tailings; wherein, the second-stage fine swept ore concentrate returns to the first-stage fine concentration step to form closed cycle, and the second-stage fine swept tailing returns to the second-stage grinding step to form closed cycle.
Example 2
The embodiment provides a method for selecting copper and nickel from copper-nickel ores, which is different from embodiment 1 in that ore feeding is performed, and the copper grade and the nickel grade in the copper-nickel ores are respectively 0.87% and 1.30%.
The copper-nickel ore mainly contains valuable elements of copper and nickel, and also contains recoverable rare and precious metal such as gold, silver, platinum and palladium. The nickel minerals mainly comprise pentlandite, cupronite and violarite, the copper minerals mainly comprise chalcopyrite, squarine and chalcopyrite, the other metal minerals mainly comprise pyrrhotite, tetragonal pyrite, pyrite and magnetite, the rare noble metal minerals mainly comprise natural gold, argentum ore, bullion ore, tellurium bismuth palladium ore, tellurium bismuth (platinum) palladium ore and the like, and the gangue minerals mainly comprise serpentine. The structure of the ore is complex, and a large amount of magnetite and magnesium-containing gangue minerals are filled in the cleavage and cracks of the pentlandite, chalcopyrite and pyrrhotite. These magnetite and magnesium-containing gangue minerals are partially dissociated during the grinding process, but a significant portion of the magnetite and gangue minerals are associated with pentlandite, chalcopyrite, pyrrhotite.
Comparative example 2
The comparative example provides a method for mineral separation of copper-nickel ore, which is the same raw ore as the ore feeding in the example 2 and the same process flow and chemical system as the comparative example 1.
The raw ores and concentrates of examples 1-2 and comparative examples 1-2 were subjected to composition analysis, and the specific results are shown in table 1.
TABLE 1 test results of examples 1-2 and comparative examples 1-2
As can be seen from Table 1, the method for separating copper and nickel from copper-nickel ores provided by the invention can improve the recovery rate of copper and nickel and reduce the content of MgO in copper-nickel concentrates.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The method for separating copper and nickel from copper-nickel ore is characterized by adopting a flotation-magnetic separation-middling regrinding and returning to the flotation process, wherein the middling regrinding feeding is concentrate obtained by scavenging in the flotation and concentrate obtained by magnetic separation.
2. The method for separating copper and nickel from cupronickel ores according to claim 1, characterized in that the flotation includes roughing, scavenging, concentration and middling scavenging.
3. The method for selecting copper and nickel from copper-nickel ores according to claim 2, characterized in that the raw ore grinding is carried out before the roughing to obtain ore pulp with the fineness of-0.074 mm accounting for 65-72% and the mass concentration of 20-26%.
4. The method for separating copper and nickel from copper-nickel ores according to claim 3, characterized in that in the grinding, an activating agent and a secondary collector are added to the raw ores;
preferably, the activating agent is selected from one or more of copper sulfate, oxalic acid, sulfuric acid, ammonium sulfate and sodium carbonate; the addition amount of the activating agent is preferably 300g/t-1000g/t according to the feeding amount;
and/or, the auxiliary collector is selected from one or more of isopropyl ethyl thiourethane, xanthate allyl and allyl thiourethane; the addition amount of the auxiliary collector is preferably 20g/t-40g/t according to the ore feeding amount.
5. The method for selecting copper nickel from copper nickel ores according to any one of claims 2 to 4, characterized in that the roughing comprises: adding a collecting agent into the ore pulp to collect copper-nickel minerals to obtain rougher concentrate and rougher tailings; the roughing tailings are used as feeding ores for scavenging, and the roughing concentrates are used as feeding ores for concentration;
preferably, the collector consists of at least one black drug and at least one xanthate, wherein the black drug comprises No. 25 black drug, No. 31 black drug, isobutyl sodium black drug and butylamine black drug; the xanthate comprises ethyl xanthate, third-grade xanthate, butyl xanthate and amyl xanthate;
more preferably, the addition amount of the collector is 180g/t-225g/t according to the ore feeding amount.
6. The method for selecting copper and nickel from copper-nickel ores according to any one of claims 2 to 5, characterized in that the scavenging is performed 2 to 3 times, and during each scavenging process, a collector is added into the ore to collect the copper-nickel ores, so as to obtain scavenged concentrate and scavenged tailings;
preferably, according to an ore feeding amount, the addition amount of the collecting agent in the first scavenging process is 40-60 g/t; the addition amount of the collecting agent in the rest scavenging processes is 20-40 g/t;
and/or, the concentration is carried out for 2-3 times, except the last concentration, in the other concentration processes, collecting agents are added into ore feeding for concentration, and concentrated concentrate and concentrated tailings are obtained;
preferably, the addition amount of the collecting agent is 5g/t-10g/t according to the ore feeding amount.
7. The method for separating copper and nickel from cupronickel ores according to claim 6, characterized in that the middlings scavenging comprises: adding a collecting agent into the primary concentration tailings to collect copper-nickel minerals to obtain middling scavenging concentrates and middling scavenging tailings, wherein the middling scavenging concentrates return to the primary concentration step to form closed cycle, and the middling scavenging tailings serve as a final tailing stockpiling tailing pond;
more preferably, the addition amount of the collector is 20g/t-40g/t according to the ore feeding amount.
8. The method for separating copper and nickel from cupronickel ores according to any one of claims 1 to 7, characterized in that the magnetic separation comprises low-intensity magnetic separation and high-intensity magnetic separation, wherein the feeding of the low-intensity magnetic separation is tailings of the flotation, the low-intensity magnetic separation tailings are fed as the high-intensity magnetic separation, the high-intensity magnetic separation tailings are stockpiled as final tailings, and the low-intensity magnetic separation concentrate and the high-intensity magnetic separation concentrate are fed as parts of the middling regrinding.
9. The method for separating the copper and nickel from the copper-nickel ore according to the claim 8, characterized in that the magnetic field intensity of the low-intensity magnetic separation is 119.36KA/m-238.72 KA/m;
and/or the magnetic field intensity of the strong magnetic separation is 0.3T-0.5T.
10. The method for separating copper and nickel from copper-nickel ores according to any one of claims 1 to 9, characterized in that during the regrinding of middlings, an activating agent and an auxiliary collecting agent are added into ore feeding, the ore is ground to ore pulp with the fineness of-0.074 mm accounting for 80-85% and the mass concentration of 20-24%, and the ore pulp is returned to the flotation to form a closed cycle;
preferably, the activating agent is selected from one or more of copper sulfate, oxalic acid, sulfuric acid, ammonium sulfate and sodium carbonate; the addition amount of the activating agent is preferably 100g/t-300g/t according to the feeding amount;
and/or, the auxiliary collector is selected from one or more of isopropyl ethyl thiourethane, xanthate allyl and allyl thiourethane; the addition amount of the auxiliary collector is preferably 20g/t-40g/t according to the ore feeding amount.
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| AU3082077A (en) * | 1976-12-07 | 1979-05-31 | Inco Ltd. | Feneficiating nickeliferous sulphidic concentrates |
| CN103801461A (en) * | 2014-01-26 | 2014-05-21 | 乌鲁木齐金石徽龙矿业有限公司 | Low-grade copper-nickel ore flotation technology |
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| CN111054514A (en) * | 2019-11-25 | 2020-04-24 | 北京矿冶科技集团有限公司 | Method for gold separation of gold ore |
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| AU3082077A (en) * | 1976-12-07 | 1979-05-31 | Inco Ltd. | Feneficiating nickeliferous sulphidic concentrates |
| CN103801461A (en) * | 2014-01-26 | 2014-05-21 | 乌鲁木齐金石徽龙矿业有限公司 | Low-grade copper-nickel ore flotation technology |
| CN105013603A (en) * | 2015-07-24 | 2015-11-04 | 中南大学 | Copper-nickel sulfide ore mineral separation method |
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