CN114074030A - Method for separating chalcopyrite and molybdenite by simulated seawater immersion flotation - Google Patents
Method for separating chalcopyrite and molybdenite by simulated seawater immersion flotation Download PDFInfo
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- CN114074030A CN114074030A CN202111288461.XA CN202111288461A CN114074030A CN 114074030 A CN114074030 A CN 114074030A CN 202111288461 A CN202111288461 A CN 202111288461A CN 114074030 A CN114074030 A CN 114074030A
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- chalcopyrite
- molybdenite
- flotation
- simulated seawater
- molybdenum
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- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 238000005188 flotation Methods 0.000 title claims abstract description 94
- 229910052961 molybdenite Inorganic materials 0.000 title claims abstract description 94
- 229910052951 chalcopyrite Inorganic materials 0.000 title claims abstract description 85
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 239000013535 sea water Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000007654 immersion Methods 0.000 title claims abstract description 13
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 51
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 51
- 239000011733 molybdenum Substances 0.000 claims abstract description 51
- 239000012141 concentrate Substances 0.000 claims abstract description 48
- 238000000926 separation method Methods 0.000 claims abstract description 26
- 238000002791 soaking Methods 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000005273 aeration Methods 0.000 claims description 22
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 20
- 239000001110 calcium chloride Substances 0.000 claims description 10
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 10
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 10
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 10
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 10
- CSNNHWWHGAXBCP-UHFFFAOYSA-L magnesium sulphate Substances [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 10
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 10
- UIIMBOGNXHQVGW-UHFFFAOYSA-M sodium bicarbonate Substances [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 10
- 239000011780 sodium chloride Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 238000013019 agitation Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000010949 copper Substances 0.000 abstract description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 21
- 229910052802 copper Inorganic materials 0.000 abstract description 21
- 238000011084 recovery Methods 0.000 abstract description 18
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 10
- 239000011707 mineral Substances 0.000 abstract description 10
- 239000003112 inhibitor Substances 0.000 abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 238000003756 stirring Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 8
- 238000001035 drying Methods 0.000 description 8
- 238000001914 filtration Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 230000001590 oxidative effect Effects 0.000 description 5
- WUUZKBJEUBFVMV-UHFFFAOYSA-N copper molybdenum Chemical compound [Cu].[Mo] WUUZKBJEUBFVMV-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 239000013505 freshwater Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 229910001779 copper mineral Inorganic materials 0.000 description 1
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical compound [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 nokes Chemical compound 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- GNBVPFITFYNRCN-UHFFFAOYSA-M sodium thioglycolate Chemical compound [Na+].[O-]C(=O)CS GNBVPFITFYNRCN-UHFFFAOYSA-M 0.000 description 1
- 229940046307 sodium thioglycolate Drugs 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 229910052569 sulfide mineral Inorganic materials 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 239000012991 xanthate Substances 0.000 description 1
Classifications
-
- 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
- B03D1/025—Froth-flotation processes adapted for the flotation of fines
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
- B03B1/04—Conditioning for facilitating separation by altering physical properties of the matter to be treated by additives
-
- 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
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for separating chalcopyrite and molybdenite by simulated seawater immersion flotation, belonging to the technical field of mineral processing. The method for separating the chalcopyrite and the molybdenite by flotation comprises the following steps: s1, mixing chalcopyrite and molybdenite with simulated seawater, and then soaking for 14-28d to obtain ore pulp; s2, performing air flotation on the ore pulp obtained in the step S1, adjusting the pH value to 9-10, and floating out the concentrate. The method provided by the invention can realize the flotation separation of copper and molybdenum, no inhibitor is adopted in the whole method, the yield of the molybdenum concentrate is 47.8 percent at most, the recovery rate is 79.4 percent at most, and the molybdenum grade is 44.1 percent.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to a method for separating chalcopyrite and molybdenite by simulated seawater immersion flotation.
Background
Chalcopyrite (CuFeS)2) Is a main occurrence mineral of copper and is one of the most important copper mineral resources on the earth. Molybdenite (MoS)2) Is a main occurrence mineral of molybdenum, has a layered structure, and mostly belongs to a trigonal system or a hexagonal system. Except for the rare existence of molybdenite as a single deposit, most of the molybdenite is widely symbiotic with sulfide minerals, especially copper sulfide mineralsSymbiosis occurs. The copper pyrites and the molybdenite have small wettability difference and relatively close floatability, and are easy to be collected by the xanthate, so that the copper and molybdenum are difficult to be separated efficiently. The separation of copper and molybdenum is mostly carried out by flotation with a large amount of chemical agents.
The copper-molybdenum ore is generally separated by a flotation method, which mainly comprises the following steps: bulk flotation, preferential flotation and iso-flotation. The mixed flotation can cause residual medicament in the copper-molybdenum mixed concentrate, and is not beneficial to the subsequent copper-molybdenum separation; the process flow of the equal flotation process is complex, and the production cost is high; because the molybdenite is difficult to inhibit and is difficult to activate after being inhibited, the recovery rate of the molybdenum concentrate obtained by adopting the molybdenum inhibiting copper flotation process is low. Therefore, copper and molybdenum ore dressing plants at home and abroad mainly adopt a sorting process of preferentially floating molybdenum and then activating and floating copper. At present, common chalcopyrite inhibitors are mainly represented by cyanide, sulfide, nokes, sodium thioglycolate and the like, but have the problems of high cost or toxicity. How to avoid using a toxic and harmful inhibitor to realize the flotation separation of molybdenum is a technical problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to overcome the technical defects, provides a method for separating chalcopyrite and molybdenite by simulated seawater immersion flotation, and solves the technical problem that molybdenum is difficult to float from the chalcopyrite in the prior art without using an inhibitor.
In order to achieve the technical purpose, the technical scheme of the invention provides a method for separating chalcopyrite and molybdenite by flotation, which comprises the following steps:
s1, mixing chalcopyrite, molybdenite and simulated seawater, and then soaking for 14-28d to obtain ore pulp;
and S2, performing air flotation on the ore pulp obtained in the step S1, adjusting the pH value to 9-10, and floating molybdenum concentrate.
Further, in step S1, the particle diameters of the chalcopyrite and the molybdenite are 20 to 100 μm.
Further, in step S1, the particle sizes of the chalcopyrite and the molybdenite are 38 to 75 μm.
Further, in step S1, the material ratio of the total mass of the chalcopyrite and the molybdenite to the simulated seawater is 1g (100- > 150) mL.
Further, in step S2, the time of the air flotation is 10-15 min.
Further, in step S1, the main components of the simulated seawater include: 0.45-0.47mol/L NaCl, 0.01-0.02mol/L KCl, 0.01-0.02mol/L CaCl20.025-0.03mol/L MgCl20.0018-0.002mol/L NaHCO30.028-0.03mol/L of MgSO4And 0.00087-0.0009mol/L of KBr.
Further, in step S2, the aeration amount of the aeration flotation is 0.1-0.2L/min.
Further, the stirring speed of the aeration flotation is 1000-1600 rpm.
Further, in step S1, the temperature of the soaking is 15 to 40 ℃.
Further, in step S2, the gas charged by the air-charging flotation is air.
Compared with the prior art, the invention has the beneficial effects that: the simulation seawater and the natural seawater have similar solution environments (the concentration and the ionic strength of each component are similar to those of the natural seawater), the basic mechanism of the seawater soaking for realizing the separation of copper and molybdenum is to utilize the seawater to oxidize pyrite and molybdenite to different degrees, the hydrophobic substance generated by slight oxidation of the surface of a mineral is the main reason of good natural floatability of most sulfide ores, the oxidation rates of the chalcopyrite and the molybdenite in the seawater are different, the chalcopyrite is easier to be oxidized, and the middle separator of the seawater even has a promoting effect on the dissolution of the chalcopyrite, so that the chalcopyrite has a stronger oxidizing effect, the molybdenite is slightly oxidized to generate the hydrophobic substance, and the molybdenite is floated. In addition, chalcopyrite and molybdenite are floated in the environment with the pH value of 9-10, high pH value can cause calcium ions or magnesium ions in seawater to generate hydroxide precipitates, the hydroxide precipitates are more easily attached to the surface of the chalcopyrite to inhibit the chalcopyrite flotation, and the surface of the molybdenite is not easy to adsorb the hydroxide precipitates, so that the molybdenite flotation is not influenced. After soaking for 14-28 days, flotation separation of molybdenum can be realized by air flotation, no toxic or harmful inhibitor is adopted in the whole method, the yield of molybdenum concentrate is 47.8 percent at most, the recovery rate is 79.4 percent at most, and the content of molybdenite is 83.0 percent at most (grade is 44.1 percent).
Detailed Description
The specific embodiment provides a method for separating chalcopyrite and molybdenite by simulated seawater immersion flotation, which comprises the following steps:
s1, mixing chalcopyrite, molybdenite and simulated seawater, and then soaking at 15-40 ℃ for 14-28d to obtain ore pulp; the particle sizes of the chalcopyrite and the molybdenite are less than 100 mu m; further, the particle sizes of the chalcopyrite and the molybdenite are 38-75 μm; the ratio of the total mass of the chalcopyrite and the molybdenite to the simulated seawater material is 1g (100-150) mL; the main components of the simulated seawater comprise: 0.45-0.47mol/L NaCl, 0.01-0.02mol/L KCl, 0.01-0.02mol/L CaCl20.025-0.03mol/L MgCl20.0018-0.002mol/L NaHCO30.028-0.03mol/L of MgSO4And 0.00087-0.0009mol/L of KBr;
s2, performing air flotation on the ore pulp obtained in the step S1 for 10-15min, adjusting the pH of the ore pulp to 9-10 by using sodium hydroxide, and floating molybdenum concentrate; the aeration quantity of the aeration flotation is 0.1-0.2L/min, the stirring speed is 1000-;
and S3, collecting the concentrate (molybdenum concentrate) and the tailings (copper concentrate) after flotation by a filtering method, and drying.
It should be noted that the pH is usually adjusted to 9-10 and then stabilized for 6-10min, and the invention is usually stabilized for 6 min.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following examples or comparative examples, the mass ratio of chalcopyrite to molybdenite was 1: 1; the particle sizes of the chalcopyrite and the molybdenite are 38-75 mu m. The purity of the chalcopyrite is 99.85 percent, wherein Cu accounts for 31.83 percent, Fe accounts for 31.12 percent, and S accounts for 36.90 percent; the purity of the molybdenite is 96.41%, wherein Mo accounts for 53.11%, and S accounts for 43.30%.
Test example 1
The test example provides a method for soaking and floating chalcopyrite or molybdenite by using simulated seawater, which comprises the following steps:
s1, mixing chalcopyrite and molybdenite single minerals with simulated seawater respectively, and then soaking at 25 ℃ for 28d to obtain ore pulp; the mass ratio of the chalcopyrite and the molybdenite to the simulated seawater is 1g:100mL respectively; the adopted simulated seawater mainly comprises the following components: 0.47mol/L NaCl, 0.01mol/L KCl, 0.01mol/L CaCl20.025mol/L of MgCl20.0018mol/L NaHCO30.028mol/L of MgSO4And 0.00087mol/L of KBr;
s2, performing air flotation on the ore pulp obtained in the step S1 for 10min, and adjusting the pH value to 9 to obtain copper concentrate and molybdenum concentrate through flotation respectively; the aeration quantity of the aeration flotation is 0.1L/min, the stirring speed is 1200rpm, and the aerated gas is air;
and S3, collecting the copper concentrate and the molybdenum concentrate after flotation by a filtration method and drying.
The recovery rate of molybdenum concentrate obtained by flotation separation of the chalcopyrite and the molybdenite after seawater soaking is 88 percent, the recovery rate of copper concentrate is 12 percent, and the difference is 76 percent.
Test example 2
The test example provides a method for soaking and floating chalcopyrite or molybdenite by using simulated seawater, which comprises the following steps:
s1, mixing chalcopyrite and molybdenite single minerals with simulated seawater respectively, and then soaking at 28 ℃ for 14d to obtain ore pulp; the material ratio of the chalcopyrite or the molybdenite to the simulated seawater is 1g:150mL respectively; the adopted simulated seawater mainly comprises the following components: 0.46mol/L NaCl, 0.01mol/L KCl, 0.02mol/L CaCl20.03mol/L of MgCl20.0019mol/L NaHCO30.03mol/L of MgSO4And 0.0009mol/L KBr;
s2, performing air flotation on the ore pulp obtained in the step S1 for 15min, adjusting the pH value to 10, and performing flotation to obtain copper concentrate and molybdenum concentrate respectively; the aeration quantity of the aeration flotation is 0.2L/min, the stirring speed is 1300rpm, and the aerated gas is air;
and S3, collecting the copper concentrate and the molybdenum concentrate after flotation by a filtration method and drying.
Detection shows that the recovery rate of the molybdenum concentrate obtained by flotation separation of the chalcopyrite and the molybdenite soaked in the seawater is 78.3 percent, the recovery rate of the copper concentrate is 13.3 percent, and the difference is 65 percent.
Test example 3
The test example provides a method for soaking and floating chalcopyrite or molybdenite by using simulated seawater, which comprises the following steps:
s1, mixing chalcopyrite and molybdenite single minerals with simulated seawater respectively, adjusting the pH to 9, and then soaking at 30 ℃ for 21d to obtain ore pulp; the material ratio of the chalcopyrite or the molybdenite to the simulated seawater is 1g to 120mL respectively; the adopted simulated seawater mainly comprises the following components: 0.45mol/L NaCl, 0.015mol/L KCl, 0.01mol/L CaCl20.03mol/L of MgCl20.002mol/L NaHCO30.029mol/L of MgSO4And 0.00089mol/L of KBr;
s2, performing air flotation on the ore pulp obtained in the step S1 for 12min, adjusting the pH value to 9, and performing flotation to obtain copper concentrate and molybdenum concentrate respectively; the aeration quantity of the aeration flotation is 0.1L/min, the stirring speed is 1250rpm, and the aerated gas is air;
and S3, collecting the copper concentrate and the molybdenum concentrate after flotation by a filtration method and drying.
The detection proves that the recovery rate of the molybdenum concentrate is 88.1 percent, the recovery rate of the copper concentrate is 7.9 percent, and the difference is 80.2 percent.
From the experimental examples 1-3, it can be seen that the flotation method provided by the invention can efficiently float molybdenite, but chalcopyrite is difficult to float.
Based on the above experimental examples, the present invention provides a method for separating chalcopyrite and molybdenite by simulated seawater immersion flotation, and the following description will discuss the relevant examples in detail.
Example 1
The embodiment provides a method for separating chalcopyrite and molybdenite by simulated seawater immersion flotation, which comprises the following steps:
s1, mixing the mixed ore of the chalcopyrite and the molybdenite with simulated seawater, and then soaking at 28 ℃ for 14d to obtain ore pulp; the mass ratio of the chalcopyrite to the molybdenite is 1.5:1, and the material ratio of the total mass of the chalcopyrite and the molybdenite to the simulated seawater is 1g: 140 mL; the adopted simulated seawater mainly comprises the following components: 0.47mol/L NaCl, 0.02mol/L KCl, 0.015mol/L CaCl20.03mol/L of MgCl20.002mol/L NaHCO30.03mol/L of MgSO4And 0.0009mol/L KBr;
s2, performing air flotation on the ore pulp obtained in the step S1 for 10min, adjusting the pH value of the ore pulp to 10 by using sodium hydroxide, and floating molybdenum concentrate; the aeration quantity of the aeration flotation is 0.2L/min, the stirring speed is 1300rpm, and the aerated gas is air;
and S3, collecting the concentrate (molybdenum concentrate) and the tailings (copper concentrate) after flotation by a filtering method and drying.
Detection shows that the yield of the molybdenum concentrate obtained by flotation separation of the chalcopyrite and the molybdenite soaked in the seawater is 51.9%, the recovery rate is 80.3%, and the molybdenite content is 77.4% (molybdenum grade is 41.1%).
Example 2
The embodiment provides a method for separating chalcopyrite and molybdenite by simulated seawater immersion flotation, which comprises the following steps:
s1, mixing the mixed ore of the chalcopyrite and the molybdenite with simulated seawater, and then soaking at 25 ℃ for 21d to obtain ore pulp; the mass ratio of the chalcopyrite to the molybdenite is 1:1, and the material ratio of the total mass of the chalcopyrite and the molybdenite to the simulated seawater is 1g: 140 mL; the adopted simulated seawater mainly comprises the following components: 0.45mol/L NaCl, 0.018mol/L KCl, 0.02mol/L CaCl20.027mol/L of MgCl20.0019mol/L NaHCO30.03mol/L of MgSO4And 0.00088mol/L of KBr;
s2, performing air flotation on the ore pulp obtained in the step S1 for 15min, adjusting the pH value of the ore pulp to 9 by using sodium hydroxide, and performing flotation on molybdenum concentrate; the aeration quantity of the aeration flotation is 0.15L/min, the stirring speed is 1000rpm, and the aerated gas is air;
and S3, collecting the concentrate (molybdenum concentrate) after flotation by using a filtering method, drying, and calculating the molybdenum grade and the recovery rate after testing.
Detection shows that the yield of molybdenum concentrate obtained by flotation separation of the chalcopyrite and the molybdenite soaked in the seawater is 47.8%, the recovery rate is 79.4%, and the molybdenite content is 83.0% (molybdenum grade is 44.1%).
Example 3
The embodiment provides a method for separating chalcopyrite and molybdenite by simulated seawater immersion flotation, which comprises the following steps:
s1, mixing the mixed ore of the chalcopyrite and the molybdenite with simulated seawater, and then soaking at 15 ℃ for 24d to obtain ore pulp; the mass ratio of the chalcopyrite to the molybdenite is 1:1, and the ratio of the total mass of the chalcopyrite and the molybdenite to the solid material in the simulated seawater is 1g:150 mL; the adopted simulated seawater mainly comprises the following components: 0.46mol/L NaCl, 0.02mol/L KCl, 0.01mol/L CaCl20.025mol/L of MgCl20.002mol/L NaHCO30.029mol/L of MgSO4And 0.0009mol/L KBr;
s2, performing air flotation on the ore pulp obtained in the step S1 for 12min, adjusting the pH value of the ore pulp to 10 by using sodium hydroxide, and floating molybdenum concentrate; the aeration quantity of the aeration flotation is 0.15L/min, the stirring speed is 1400rpm, and the aerated gas is air;
and S3, collecting the concentrate (molybdenum concentrate) after flotation by using a filtering method, drying, and calculating the molybdenum grade and the recovery rate after testing.
Detection shows that the yield of molybdenum concentrate obtained by flotation separation of the chalcopyrite and the molybdenite soaked in the seawater is 46.5%, the recovery rate is 76.2%, and the molybdenite content is 81.9% (molybdenum grade is 43.5%).
Example 4
The embodiment provides a method for separating chalcopyrite and molybdenite by simulated seawater immersion flotation, which comprises the following steps:
s1, mixing the chalcopyrite and the molybdeniteMixing with simulated seawater, and soaking at 40 deg.C for 21d to obtain ore pulp; the mass ratio of the chalcopyrite to the molybdenite is 1:1, and the material ratio of the total mass of the chalcopyrite and the molybdenite to the simulated seawater is 1g:100 mL; the adopted simulated seawater mainly comprises the following components: 0.47mol/L NaCl, 0.019mol/L KCl, 0.015mol/L CaCl20.029mol/L of MgCl20.0019mol/L NaHCO30.029mol/L of MgSO4And 0.00088mol/L of KBr;
s2, performing air flotation on the ore pulp obtained in the step S1 for 10min, adjusting the pH value of the ore pulp to 9 by using sodium hydroxide, and performing flotation on molybdenum concentrate; the aeration quantity of the aeration flotation is 0.15L/min, the stirring speed is 1600rpm, and the aerated gas is air;
and S3, collecting the concentrate (molybdenum concentrate) after flotation by using a filtering method, drying, and calculating the molybdenum grade and the recovery rate after testing.
Detection shows that the yield of molybdenum concentrate obtained by flotation separation of the chalcopyrite and the molybdenite soaked in the seawater is 46.1%, the recovery rate is 74.5%, and the molybdenite content is 80.8% (molybdenum grade is 42.9%).
Comparative example 1
This comparative example differs from example 1 in that: in step S2, the pH is adjusted to 11.
Through detection, the yield of concentrate obtained by flotation separation of the chalcopyrite and the molybdenite soaked in the seawater is 6.2%, the recovery rate is 6.7%, and the molybdenite content is 53.9% (molybdenum grade is 28.6%).
Comparative example 2
This comparative example differs from example 1 in that: in step S1, not the simulated seawater but the normal fresh water is used.
Detection shows that the yield of the molybdenum concentrate obtained by flotation separation of the chalcopyrite and the molybdenite soaked in the seawater is 31.9%, the recovery rate is 38.1%, and the molybdenite content is 59.7% (molybdenum grade is 31.7%).
It can be seen from the above examples and comparative examples that molybdenite can be effectively separated by flotation by the method proposed in the present application, while the comparative example has a higher pH or does not float molybdenite well with fresh water.
Firstly, the mineral sample adopted by the invention has higher purity. Secondly, the sulphide ores have certain natural floatability, most importantly, the chalcopyrite is easy to oxidize, and the molybdenite is stable, so the chalcopyrite is easy to be oxidized to generate a large amount of hydrophilic oxides, the chalcopyrite flotation is inhibited, and the molybdenite is not capable of being oxidized; in addition, compared with the method of adding an oxidant (the operation is complex when the oxidant is added, the concentration is difficult to control, and more or less is easy to add), the seawater soaking operation is simple and convenient, and indexes are easier to control (soaking time, pH value and the like); simulating the action mechanism of seawater in the device: the similar function of the oxidant is provided, so that chalcopyrite and molybdenite are oxidized to different degrees, and copper and molybdenum separation is realized; the mechanism of penetration is not complete, and it is speculated that the Cl ions in seawater accelerate the corrosion of metals and minerals, thus oxidizing chalcopyrite, producing hydrophilic substances, reducing floatability, while molybdenite is stable, not easily oxidized, and not affecting flotation.
Other beneficial effects are as follows:
1. the invention provides a method for realizing inhibitor-free flotation separation of chalcopyrite and molybdenite by using simulated seawater immersion treatment, which does not add any inhibitor in the whole flotation process, reduces pollution in the flotation process from the source and simplifies the copper-molybdenum flotation separation process.
2. In the experimental process, the equipment is very simple, only high-salt water or seawater is subjected to standing soaking, and in the actual production process, a factory can select proper terrain to be stockpiled and soaked according to local conditions. The available water source is wide, the plant near the seaside can directly use seawater, and the inland plant can use the high-salt ore dressing backwater without chemicals, thereby simplifying the flotation process and solving the problem of partial sewage discharge.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method for separating chalcopyrite and molybdenite by simulated seawater immersion flotation is characterized by comprising the following steps:
s1, mixing the chalcopyrite and the molybdenite with simulated seawater respectively, and then soaking for 14-28d to obtain ore pulp;
and S2, performing air flotation on the ore pulp obtained in the step S1, adjusting the pH value to 9-10, and floating molybdenum concentrate.
2. The method for flotation separation of chalcopyrite and molybdenite according to claim 1, wherein the particle size of the chalcopyrite and the molybdenite is 20-100 μm in step S1.
3. The method for flotation separation of chalcopyrite and molybdenite according to claim 2, wherein the particle size of the chalcopyrite and the molybdenite is 38-75 μm in step S1.
4. The method for flotation separation of chalcopyrite and molybdenite according to claim 1, wherein in step S1, the material ratio of the total mass of the chalcopyrite and the molybdenite to the simulated seawater is 1g (100- > 150) mL.
5. The method for flotation separation of chalcopyrite and molybdenite according to claim 1, wherein the aerated flotation time is 10-15min in step S2.
6. The method for flotation separation of chalcopyrite and molybdenite according to claim 1, wherein in step S1, the composition of the simulated seawater includes: 0.45-0.47mol/L NaCl, 0.01-0.02mol/L KCl, 0.01-0.02mol/L CaCl20.025-0.03mol/L MgCl20.0018-0.002mol/L NaHCO30.028-0.03mol/L of MgSO4And 0.00087-0.0009mol/L of KBr.
7. The method for flotation separation of chalcopyrite and molybdenite according to claim 1, wherein the aeration amount of the aeration flotation is 0.1-0.2L/min in step S2.
8. The method for flotation separation of chalcopyrite and molybdenite according to claim 1, wherein the agitation speed of the aeration flotation is 1000-.
9. The method for flotation separation of chalcopyrite and molybdenite according to claim 1, wherein the soaking temperature is 15-40 ℃ in step S1.
10. The method for flotation separation of chalcopyrite and molybdenite according to claim 1, wherein in step S2, the gas charged for the aerated flotation is air.
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Application publication date: 20220222 |