CN110976102A - Method for reducing content of magnesium oxide in copper-nickel concentrate - Google Patents
Method for reducing content of magnesium oxide in copper-nickel concentrate Download PDFInfo
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- CN110976102A CN110976102A CN201911168287.8A CN201911168287A CN110976102A CN 110976102 A CN110976102 A CN 110976102A CN 201911168287 A CN201911168287 A CN 201911168287A CN 110976102 A CN110976102 A CN 110976102A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
Abstract
The invention provides a method for reducing the content of magnesium oxide in copper-nickel concentrate, which comprises the following steps: carrying out equal flotation on the copper-nickel concentrate to obtain copper-nickel bulk rough concentrate; and performing magnesium removal reverse flotation on the copper-nickel mixed rough concentrate to obtain copper-nickel mixed concentrate. According to the method provided by the embodiment of the invention, the content of magnesium oxide in the bulk concentrate is reduced, and the high-quality copper-nickel bulk concentrate can be obtained.
Description
Technical Field
The invention relates to a beneficiation technology, in particular to a beneficiation method for copper-nickel sulfide ore containing serpentine and talc.
Background
The copper-nickel sulfide ore is almost produced in bedrock and ultrabedrock ore deposits, and common sulfide minerals in the ore are pyrrhotite, pentlandite, chalcopyrite, and violarite, pervonite, pyrite and the like formed by primary ore alteration. Copper nickel sulfide ore contains not only copper sulfide and nickel sulfide minerals but also a wide variety of other minerals, and the composition of gangue minerals in the ore is very similar. Most of nickel sulfide and copper ore magnesium-containing silicate is mainly talc or serpentine.
Generally, the gangue such as serpentine and talc has the characteristics of high content, easy argillization and good natural floatability. Specifically, the content of talc and serpentine in the copper-nickel ore is up to more than 30 percent, which is about 10 times of the content of the copper-nickel sulfide ore; and the floatability of the ore is often more than that of associated sulphide ore, thus seriously affecting the quality of the concentrate. Therefore, the method has the problems of removing serpentine and talc and reducing the MgO content in the concentrate in the flotation of the copper nickel sulfide ore.
Under a general flotation system, the argillized gangue covers the surface of the copper nickel sulfide mineral and is easy to adsorb with a collecting agent. The traditional method adopts one or more of water glass, CMC (carboxymethyl cellulose), guar gum, sodium hexametaphosphate and dextrin as serpentine and talc inhibitors. However, the traditional inhibitor is added in the copper-nickel ore flotation process, the using amount is large, the effect is very little, and the content of magnesium oxide in copper-nickel ore concentrate is high; the traditional inhibitor has a certain inhibiting effect on the flotation of the copper-nickel sulfide ore and influences the filtration of concentrate and the concentration of tailings.
In addition, as the serpentine and the talc belong to high-melting-point substances, the smelting cost is increased due to the excessively high content of the serpentine and the talc, and the furnace nodulation is caused due to the excessively high viscosity of a slag phase, so that the slag phase is difficult to separate, and the smelting recovery rate is reduced. In view of the defects of the traditional process, the research on the method for reducing the content of magnesium oxide in the copper-nickel concentrate is of great practical significance.
Disclosure of Invention
One of the main objects of the present invention is to provide a method for reducing the content of magnesium oxide in a copper-nickel concentrate, which comprises the following steps: carrying out equal flotation on the copper-nickel concentrate to obtain copper-nickel bulk rough concentrate; and performing magnesium removal reverse flotation on the copper-nickel mixed rough concentrate to obtain copper-nickel mixed concentrate.
According to an embodiment of the invention, the method comprises the step of carrying out equal floatable flotation on the copper-nickel concentrate after ore grinding pretreatment, wherein the ore grinding pretreatment comprises the following steps: mixing the ore and water to form ore pulp, and grinding the ore pulp in a ball mill until particles with the granularity of-0.074 mm account for 60-90%.
According to one embodiment of the invention, butyl xanthate and terpineol oil are used as the floatable collectors and frothers.
According to an embodiment of the present invention, the amount of the butyl xanthate is 60 to 300 g/ton of ore, and the amount of the pine oil is 30 to 100 g/ton of ore.
According to an embodiment of the present invention, the iso-floatable process includes: adding the butyl xanthate and the terpineol oil into the ore pulp, stirring while adding, stirring for 3-5 minutes after adding, and performing flotation for 2-10 minutes.
According to an embodiment of the invention, copper-nickel mixed rough concentrate and rough concentrate II are obtained by carrying out equal flotation on the copper-nickel concentrate, and blank concentration is carried out on the copper-nickel mixed rough concentrate for 2-3 times to obtain the copper-nickel mixed rough concentrate and concentrated tailings.
According to one embodiment of the invention, scavenging is performed on the rough concentrate II to obtain scavenged concentrate and scavenged tailings, and the concentration tailings and the scavenged concentrate are sent to the equal-floatable working section.
According to one embodiment of the invention, the method comprises adding sodium thioglycolate or sodium sulfide to the copper-nickel mixed rough concentrate to perform the demagging reverse flotation.
According to an embodiment of the invention, the demagging reverse flotation comprises: and adding sodium thioglycolate or sodium sulfide into the copper-nickel bulk concentrates, stirring for 3-5 minutes, and floating serpentine and talc for 2-5 minutes to obtain reverse flotation concentrates and the copper-nickel bulk concentrates.
According to one embodiment of the invention, the reverse flotation concentrate is concentrated for 2-3 times to obtain serpentine, talc and concentrated tailings, and the concentrated tailings are sent to the demagging reverse flotation section.
According to the method provided by the embodiment of the invention, the content of magnesium oxide in the bulk concentrate is reduced, and the high-quality copper-nickel bulk concentrate can be obtained.
Drawings
Fig. 1 is a flow chart of a method for reducing the content of magnesium oxide in a copper-nickel concentrate according to an embodiment of the invention.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.
Referring to fig. 1, an embodiment of the present invention provides a beneficiation method for copper-nickel ores, which can reduce the content of magnesium oxide in copper-nickel concentrates, and includes:
carrying out equal flotation on copper-nickel concentrate (such as copper-nickel sulfide ore), and carrying out blank concentration on equal flotation foam to obtain copper-nickel bulk rough concentrate; and
and performing magnesium removal reverse flotation on the copper-nickel mixed rough concentrate to obtain the high-grade low-magnesium-oxide copper-nickel mixed concentrate.
According to the method provided by the embodiment of the invention, serpentine and talc in the ore are removed through reverse flotation aiming at the copper-nickel mixed rough concentrate with high magnesium content, and the flotation tailings are copper-nickel minerals, so that the purposes of improving the grade of the copper-nickel mixed concentrate and reducing the content of magnesium oxide are achieved.
In one embodiment, the ore is subjected to an ore grinding pretreatment and then to an iso-flotation.
In one embodiment, the ore grinding pretreatment comprises: the ore is mixed with water to form a slurry and the ore is ground in a ball mill to a suitable fineness.
In one embodiment, the slurry in the pretreatment process may contain 30-45% by weight of solid ore, and the ore may be ground in a ball mill to a particle size of-0.074 mm of 60-90%.
In one embodiment, butyl xanthate and terpineol oil are used as floatable collectors and frothers for copper nickel sulfide ore and the like.
In one embodiment, the amount of the butyl xanthate added is 60 to 300 g/ton of ore, for example, 80 g/ton of ore, 100 g/ton of ore, 150 g/ton of ore, 200 g/ton of ore, and 250 g/ton of ore.
In one embodiment, the amount of the pine oil added is 30 to 100 g/ton of ore, for example, 40 g/ton of ore, 50 g/ton of ore, 60 g/ton of ore, or 80 g/ton of ore.
In one embodiment, the flotation time for the isocloatation may be 2 to 10 minutes, for example, 3 minutes, 4 minutes, 5 minutes, 8 minutes.
In one embodiment, the iso-floatable process comprises: and adding the butyl xanthate and the pine alcohol oil into the ore pulp in sequence, stirring while adding, continuing to stir for 3-5 minutes after the last agent is added, and performing flotation for 3-10 minutes to obtain the copper-nickel mixed rough concentrate.
In one embodiment, the first rough concentrate (copper-nickel bulk rough concentrate) and the second rough concentrate (copper-nickel bulk rough concentrate) are obtained by subjecting the ore to iso-flotation.
In one embodiment, the roughing concentrate II is scavenged for 2 times to obtain scavenged concentrate and tailings, and the scavenged concentrate can be sent to an equal flotation section for reuse.
In one embodiment, butyl xanthate and terpineol oil can be added during the scavenging process, and the scavenging time can be 2 minutes.
In one embodiment, the copper-nickel mixed rough concentrate can be subjected to blank concentration for 2-3 times to obtain copper-nickel mixed rough concentrate and concentrated tailings, and the concentrated tailings can be sent to an equal-flotation section for reuse.
In one embodiment, the copper-nickel mixed rough concentrate is subjected to magnesium removal and reverse flotation to obtain reverse flotation concentrate and reverse flotation tailings, wherein the reverse flotation tailings are the high-grade low-magnesium-oxide copper-nickel mixed concentrate.
In one embodiment, sodium thioglycolate or sodium sulfide is added to the copper-nickel mixed rough concentrate to perform reverse demagging flotation.
In one embodiment, 500-10000 g sodium thioglycolate or sodium sulfide is added to each ton of mineral powder, such as 1000 g/ton mineral powder, 1500 g/ton mineral powder, 2000 g/ton mineral powder, 3000 g/ton mineral powder, 5000 g/ton mineral powder, 6000 g/ton mineral powder, 8000 g/ton mineral powder, and 9000 g/ton mineral powder.
In one embodiment, the flotation time of the demagging reverse flotation can be 2-5 minutes, such as 3 minutes and 4 minutes.
In one embodiment, the demagging reverse flotation comprises: adding sodium thioglycolate or sodium sulfide (500-10000 g of sodium thioglycolate or sodium sulfide per ton of mineral powder) into the copper-nickel bulk rough concentrate, stirring for 3-5 minutes, and carrying out serpentine and talc flotation for 2-5 minutes to obtain reverse flotation concentrate and reverse flotation tailings.
In one embodiment, the reverse flotation concentrate is subjected to concentration for 2-3 times to obtain serpentine, talc (concentration foam) and concentration tailings, the concentration tailings can be sent to a magnesium-removing reverse flotation section for reuse, and the serpentine and the talc can be sold as products or sent to a tailing pond as tailings.
In one embodiment, sodium thioglycolate or sodium sulfide may be added as an inhibitor in appropriate amounts during the reverse flotation of the concentrate.
In the invention, the existing processes can be adopted for fine selection, flotation, scavenging and the like.
According to the method provided by the embodiment of the invention, copper-nickel bulk concentrates are obtained by carrying out equal floatable separation on copper-nickel minerals, serpentine and talc (copper-nickel sulfide), and then the copper-nickel bulk concentrates are subjected to a demagging reverse flotation process, so that high-quality copper-nickel bulk concentrates are obtained, the problem of high content of magnesium oxide in the copper-nickel bulk concentrates is solved, and better technical and economic indexes are obtained.
In one embodiment, copper nickel minerals, serpentine, talc (copper nickel sulfide minerals) and the like can be floated, the process adaptability is strong, the operation is simple, and the indexes are stable.
Compared with the traditional process, the method of the embodiment of the invention reduces the content of magnesium oxide and the dosage of the inhibitor in the bulk concentrate, eliminates the negative effects of the traditional inhibitor on concentrate filtration and tailing concentration, and has obvious effect.
The method for reducing the content of magnesium oxide in the copper-nickel concentrate according to an embodiment of the present invention is further described with reference to the following specific examples.
Example 1
Certain copper-nickel ore in the Qinghai contains 0.78% of nickel, 0.16% of copper and 27% of magnesium oxide, copper minerals mainly comprise chalcopyrite, and a small amount of chalcopyrite, a small amount of square chalcopyrite and copper blue; the nickel mineral is mainly pentlandite, and a small amount of violarite; the nonmetallic minerals mainly comprise talc and serpentine; and secondly tremolite, chlorite, etc. The copper-nickel ore is treated by adopting the following process:
pretreatment: mixing ore and water to prepare ore pulp, wherein the mass percentage concentration of the ore is 30 percent, and grinding the ore in a ball mill until the ore is ground to be-0.074 mm and accounts for 90 percent.
And (3) flotation: according to the addition amounts of 60 g/ton of butyl xanthate and 100 g/ton of pine oil in ores, adding the butyl xanthate and the pine oil into the pretreated ore pulp in sequence, stirring while adding, continuing to stir for 5 minutes after the last agent is added, and performing flotation for 2 minutes to obtain copper-nickel mixed rough concentrate and rough concentrate II; scavenging the rough concentrate II for 2 times to obtain scavenged concentrate and tailings, and sending the scavenged concentrate to an equal-flotation section for recycling; and performing blank concentration on the copper-nickel mixed rough concentrate for 3 times to obtain copper-nickel mixed rough concentrate.
Magnesium removal and reverse flotation: adding sodium thioglycolate or sodium sulfide (500 g/ton ore powder) into the obtained copper-nickel mixed rough concentrate, stirring for 5 minutes, and performing flotation on serpentine and talc for 3 minutes to obtain reverse flotation concentrate and reverse flotation tailings (copper-nickel mixed concentrate); carrying out concentration on the reverse flotation concentrate for 3 times (adding sodium thioglycolate as an inhibitor), wherein the concentration foam is serpentine and talc, and the serpentine and the talc can be sold as a product or sent to a tailing pond as tailings; and (4) sending the selected tailings to a demagging reverse flotation section for recycling.
And the final copper-nickel bulk concentrate contains 1.75% of copper, 9.2% of nickel and 4.2% of magnesium oxide, and compared with the traditional method, the copper-nickel grade in the bulk concentrate is improved by about 30%, and the magnesium oxide content is reduced by 4.5%.
Example 2
In a certain copper-nickel mine in Canada, 0.72 percent of nickel, 0.63 percent of copper and 19 percent of magnesium oxide are contained in the ore, and the nickel mineral in the ore is mainly pentlandite and then purite; the copper minerals are mainly chalcopyrite and secondly bornite; the sulfur mineral is mainly pyrrhotite; the gangue minerals include serpentine, hornblende, pyroxene, feldspar, chlorite, etc.
The same process as that of example 1 is adopted to treat the copper-nickel bulk concentrate, the final copper-nickel bulk concentrate contains 13.50% of copper, 10.40% of nickel and 2.66% of magnesium oxide, and compared with the traditional method, the copper-nickel grade in the bulk concentrate is improved by about 18% and the magnesium oxide content is reduced by 3.5%.
Unless otherwise defined, all terms used herein have the meanings commonly understood by those skilled in the art.
The described embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of the present invention, and those skilled in the art may make various other substitutions, alterations, and modifications within the scope of the present invention, and thus, the present invention is not limited to the above-described embodiments but only by the claims.
Claims (10)
1. A method for reducing the content of magnesium oxide in copper-nickel concentrate comprises the following steps:
carrying out equal flotation on the copper-nickel concentrate to obtain copper-nickel bulk rough concentrate; and
and performing magnesium removal reverse flotation on the copper-nickel mixed rough concentrate to obtain copper-nickel mixed concentrate.
2. The method of claim 1, comprising subjecting the cupronickel concentrate to the iso-floatable flotation after a grinding pretreatment comprising: mixing the ore and water to form ore pulp, and grinding the ore pulp in a ball mill until particles with the granularity of-0.074 mm account for 60-90%.
3. The method of claim 1 wherein butyl xanthate, pine oil are used as the floatable collector and frother.
4. A process according to claim 3, wherein the amount of butyl xanthate is 60 to 300 g/ton of ore and the amount of pine oil is 30 to 100 g/ton of ore.
5. The method of claim 1, wherein the iso-floatable process comprises: adding the butyl xanthate and the terpineol oil into the ore pulp, stirring while adding, stirring for 3-5 minutes after adding, and performing flotation for 2-10 minutes.
6. The method according to claim 1, wherein copper-nickel bulk rough concentrate and rough concentrate II are obtained by carrying out equal flotation on the copper-nickel concentrate, and the copper-nickel bulk rough concentrate is subjected to blank concentration for 2-3 times to obtain the copper-nickel bulk rough concentrate and concentration tailings.
7. The method according to claim 6, wherein the coarse concentrate II is scavenged to obtain scavenged concentrate and scavenged tailings, and the concentration tailings and the scavenged concentrate are sent to the equal floatable section.
8. The method of claim 1, comprising adding sodium thioglycolate or sodium sulfide to the copper-nickel mixed rough concentrate to perform the demagging reverse flotation.
9. The method of claim 1, wherein the demagging reverse flotation comprises: and adding sodium thioglycolate or sodium sulfide into the copper-nickel bulk concentrates, stirring for 3-5 minutes, and floating serpentine and talc for 2-5 minutes to obtain reverse flotation concentrates and the copper-nickel bulk concentrates.
10. The method according to claim 9, wherein the reverse flotation concentrate is concentrated 2-3 times to obtain serpentine, talc and concentration tailings, and the concentration tailings are sent to the demagging reverse flotation section.
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| CN111841898A (en) * | 2020-07-17 | 2020-10-30 | 矿冶科技集团有限公司 | Combined inhibitor for refractory fine-grained molybdenum-lead bulk concentrate and application thereof |
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Application publication date: 20200410 |