CN115055285A - Flotation method of lead-sulfur bulk concentrate and pyrite combined inhibitor - Google Patents
Flotation method of lead-sulfur bulk concentrate and pyrite combined inhibitor Download PDFInfo
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- CN115055285A CN115055285A CN202210440259.2A CN202210440259A CN115055285A CN 115055285 A CN115055285 A CN 115055285A CN 202210440259 A CN202210440259 A CN 202210440259A CN 115055285 A CN115055285 A CN 115055285A
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- lead
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- 239000011593 sulfur Substances 0.000 title claims abstract description 81
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 81
- 238000005188 flotation Methods 0.000 title claims abstract description 78
- 239000012141 concentrate Substances 0.000 title claims abstract description 56
- 239000011028 pyrite Substances 0.000 title claims abstract description 44
- 229910052683 pyrite Inorganic materials 0.000 title claims abstract description 44
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000003112 inhibitor Substances 0.000 title claims abstract description 21
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000004571 lime Substances 0.000 claims abstract description 41
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 38
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 38
- PUKLDDOGISCFCP-JSQCKWNTSA-N 21-Deoxycortisone Chemical compound C1CC2=CC(=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@@](C(=O)C)(O)[C@@]1(C)CC2=O PUKLDDOGISCFCP-JSQCKWNTSA-N 0.000 claims abstract description 24
- FCYKAQOGGFGCMD-UHFFFAOYSA-N Fulvic acid Natural products O1C2=CC(O)=C(O)C(C(O)=O)=C2C(=O)C2=C1CC(C)(O)OC2 FCYKAQOGGFGCMD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229940095100 fulvic acid Drugs 0.000 claims abstract description 24
- 239000002509 fulvic acid Substances 0.000 claims abstract description 24
- 230000002000 scavenging effect Effects 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 15
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims abstract description 10
- 229960001763 zinc sulfate Drugs 0.000 claims abstract description 10
- 229910000368 zinc sulfate Inorganic materials 0.000 claims abstract description 10
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims abstract description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 45
- QTANTQQOYSUMLC-UHFFFAOYSA-O Ethidium cation Chemical compound C12=CC(N)=CC=C2C2=CC=C(N)C=C2[N+](CC)=C1C1=CC=CC=C1 QTANTQQOYSUMLC-UHFFFAOYSA-O 0.000 claims description 12
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 9
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000012991 xanthate Substances 0.000 claims description 5
- RIZMRRKBZQXFOY-UHFFFAOYSA-N ethion Chemical compound CCOP(=S)(OCC)SCSP(=S)(OCC)OCC RIZMRRKBZQXFOY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 24
- 239000011707 mineral Substances 0.000 abstract description 24
- 229910052949 galena Inorganic materials 0.000 abstract description 15
- XCAUINMIESBTBL-UHFFFAOYSA-N lead(ii) sulfide Chemical compound [Pb]=S XCAUINMIESBTBL-UHFFFAOYSA-N 0.000 abstract description 15
- 229910052751 metal Inorganic materials 0.000 abstract description 12
- 239000002184 metal Substances 0.000 abstract description 12
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 abstract description 8
- 238000011084 recovery Methods 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 2
- 239000005083 Zinc sulfide Substances 0.000 abstract 1
- 229910052984 zinc sulfide Inorganic materials 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 9
- 230000005764 inhibitory process Effects 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 238000011160 research Methods 0.000 description 8
- 229910021532 Calcite Inorganic materials 0.000 description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 7
- 229910000514 dolomite Inorganic materials 0.000 description 7
- 239000010459 dolomite Substances 0.000 description 7
- 229910052950 sphalerite Inorganic materials 0.000 description 7
- 229910052725 zinc Inorganic materials 0.000 description 7
- 239000011701 zinc Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- BITVSRNAFFZUFW-UHFFFAOYSA-N 5-ethyl-6-phenylphenanthridin-5-ium-3,8-diamine;chloride Chemical compound [Cl-].C12=CC(N)=CC=C2C2=CC=C(N)C=C2[N+](CC)=C1C1=CC=CC=C1 BITVSRNAFFZUFW-UHFFFAOYSA-N 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 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
- 230000002195 synergetic effect Effects 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- -1 and meanwhile Chemical compound 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- KIZFHUJKFSNWKO-UHFFFAOYSA-M calcium monohydroxide Chemical compound [Ca]O KIZFHUJKFSNWKO-UHFFFAOYSA-M 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005421 electrostatic potential Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920001277 pectin Polymers 0.000 description 1
- 239000001814 pectin Substances 0.000 description 1
- 235000010987 pectin Nutrition 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 239000002265 redox agent Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229920005552 sodium lignosulfonate Polymers 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
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
- B03D1/001—Flotation agents
- B03D1/018—Mixtures of inorganic and organic compounds
-
- 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
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/06—Depressants
-
- 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
Abstract
The invention relates to a flotation method of lead-sulfur bulk concentrate and a pyrite combined inhibitor, belonging to the technical field of metal mineral processing and comprising the following steps: grinding the high-sulfur lead-zinc sulfide ore by using a ball mill, adding an ethyl xanthate, zinc sulfate and second oil to perform lead-sulfur mixed flotation to obtain lead-sulfur mixed concentrate; adding hydrogen peroxide into the lead-sulfur bulk concentrate pulp, stirring for 2-5 minutes, then adding fulvic acid and lime, stirring for 2-5 minutes to ensure that the pH value of the pulp is more than 11 and the potential of the pulp is less than-120 mV, and separating galena from pyrite by one-time roughing, three-time fine selection and two-time scavenging separation flotation operation. The method has the advantages of low cost, high metal recovery rate and low lime consumption, reduces pipeline scaling, and can realize high-efficiency separation of galena and pyrite in the lead-sulfur bulk concentrate.
Description
Technical Field
The invention belongs to the technical field of metal mineral processing, and particularly relates to a flotation method of lead-sulfur bulk concentrate and a pyrite combined inhibitor.
Background
Since the surfaces of galena and pyrite in the lead-sulfur bulk concentrate adsorb a large amount of hydrophobic agents, the pyrite is difficult to inhibit, and a large amount of lime is needed to effectively inhibit the pyrite. However, the use of lime easily causes scaling of pipelines and scaling of flotation equipment, which causes blockage of conveying pipelines and flotation equipment, and increases the number of times of shutdown maintenance. Meanwhile, the lime has the advantages of low price, good inhibition effect and the like, and is widely used in the selected ore field. In order to better suppress pyrite, overcoming the disadvantages of lime as an inhibitor, various inhibitors have been developed, such as: (1) redox agents: sulfites, potassium permanganate, hydrogen peroxide, and the like; (2) organic inhibitors: DETA, polyacrylamide, pectin, sodium lignosulfonate, sodium humate and the like. The research of the potential regulation flotation technology can selectively adjust the oxidation degree of the mineral surface by using the surface oxidation reducing agent, and is beneficial to the inhibition of pyrite. However, since the selectivity of the redox inhibitors and the organic inhibitors is poor, the dosage of the drugs is difficult to control.
In order to overcome the defects of lime and exert the advantages of lime, the invention provides a flotation method with low lime consumption, and the method can reduce the lime consumption under the condition of obtaining high-quality lead concentrate, so that the flotation process is more stable and the flotation wastewater is easier to treat.
Disclosure of Invention
In order to overcome the problems in the background technology, the invention provides a flotation method of lead-sulfur bulk concentrate and a pyrite combination inhibitor, which overcome the problems of pipeline scaling, difficult treatment of high-calcium wastewater and the like caused by using single lime as an inhibitor, realize stable production in the flotation process of the lead-sulfur bulk concentrate, obtain qualified concentrate products and have higher metal recovery rate.
In order to realize the purpose, the invention is realized by the following technical scheme:
the flotation method of the lead-sulfur bulk concentrate and the pyrite combined inhibitor comprise the following steps:
(1) grinding: grinding the raw ore to obtain ore pulp with preset fineness;
(2) lead and sulfur mixed flotation: adding sodium sulfide, zinc sulfate, ethidium xanthate and second oil into the ore pulp to perform lead-sulfur mixed flotation to obtain lead-sulfur mixed concentrate and lead-sulfur flotation tailings;
(3) lead and sulfur separation and flotation: adding hydrogen peroxide, fulvic acid and lime into the lead-sulfur bulk concentrate pulp, and then adding a collecting agent for lead flotation to obtain lead concentrate and sulfur concentrate.
Further, the ore pulp grinding fineness with the preset fineness is that 60-85% of the ore pulp grinding fineness is-74 mu m.
Further, the lead and sulfur mixed flotation comprises 1-2 times of roughing and 2-3 times of scavenging.
Further, the step (3) firstly adds hydrogen peroxide into the lead-sulfur bulk concentrate for stirring, and then simultaneously adds fulvic acid and lime for stirring.
Further, in the step (3), the hydrogen peroxide is added into the ore pulp for stirring for 2-5 minutes, and the fulvic acid and the lime are simultaneously added into the ore pulp for stirring for 2-5 minutes.
Further, compared with raw ore, the dosage of the hydrogen peroxide is 100-1000 g/t, the dosage of the fulvic acid is 100-500 g/t, and the dosage of the lime is 1000-2000 g/t, so that the pH value of the ore pulp is greater than 11, and the potential of the ore pulp is less than-120 mV.
Further, the lead and sulfur separation and flotation in the step (3) comprises 1-2 times of roughing, 2-4 times of concentration and 2-3 times of scavenging.
Further, the collecting agent in the step (3) is ethidium and nitrogen.
Further, the pyrite combination inhibitor comprises hydrogen peroxide, fulvic acid and lime.
The principle of the invention is as follows: the hydrogen peroxide has strong oxidizability, the electrostatic potential of the pyrite is higher than that of lead ore, so under the condition of using a proper amount of the hydrogen peroxide, the pyrite is preferentially oxidized, the double xanthates on the surface of the pyrite are desorbed, and the oxidation degree of the paralead ore is lower. Fulvic acid is an organic polymer compound, contains a large number of carboxyl groups, and has hydrophilicity. Calcium ions generated by lime in the ore pulp are adsorbed on the surface of the pyrite in the form of hydroxyl calcium ions, more active sites are provided for carboxyl groups of the fulvic acid, so that the fulvic acid and the lime act synergistically to selectively adsorb on the surface of the pyrite, the pyrite is made hydrophobic, and the adsorption of a collecting agent is prevented, so that the pyrite is restrained. And the adsorption amount of the fulvic acid on the surface of the galena is small, and the adsorption of a collecting agent is hardly hindered, so that the galena has strong hydrophobicity. Therefore, the hydrogen peroxide, the fulvic acid and the lime are sequentially added into the ore pulp according to a certain sequence, so that the synergistic effect among the agents can be generated, and the selective inhibition effect on the pyrite is enhanced.
The invention has the beneficial effects that:
according to the invention, the hydrogen peroxide-fulvic acid-lime is used as a pyrite inhibitor, and the oxidability of the hydrogen peroxide, the strong inhibition capability of the fulvic acid and the economy of the lime are combined, so that the problems of pipeline scaling, difficult treatment of high-calcium wastewater and the like caused by the fact that a single lime is used as the inhibitor are solved, the stable production of the lead-sulfur bulk concentrate flotation process is realized, the qualified concentrate product is obtained, and the metal recovery rate is high.
Drawings
FIG. 1 is a flow diagram of the flotation process of the present invention;
Detailed Description
The experimental methods used in the examples of the present invention are all conventional methods unless otherwise specified, and the materials, reagents, and the like used therein are commercially available without otherwise specified.
In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to facilitate understanding of the skilled person.
In order to more clearly show the technical effects of the technical solution provided by the present invention, the flotation method of lead-sulfur bulk concentrate and the pyrite combination depressant provided by the present invention are described in detail with specific examples below.
Example 1
The flotation research is carried out on certain lead-zinc ore in Yunnan, wherein the main minerals comprise sphalerite, galena and pyrite, the zinc grade is 22.4 percent, the lead grade is 6.8 percent, the sulfur grade is 11.4 percent, the content of the other metal minerals is low, and the gangue minerals mainly comprise calcite, dolomite and the like.
The flotation method of the ore comprises the following steps:
(1) grinding: grinding the raw ore to a fineness of 68 percent of-0.074 mm;
(2) lead and sulfur mixed flotation: adding 60g/t of sodium sulfide, 1600g/t of zinc sulfate, 15g/t of second oil and 90g/t of etihuang into the mixture for lead and sulfur mixed flotation, and obtaining lead and sulfur bulk concentrate through 2 times of roughing and 2 times of scavenging;
(3) lead and sulfur separation and flotation: adding 300g/t of hydrogen peroxide, stirring for 2 minutes, adding 200g/t of fulvic acid and 1500g/t of lime, stirring for 2 minutes, adding 20g/t of ethidium chloride, and obtaining lead concentrate through 1 time of roughing, 3 times of fine concentration and 3 times of scavenging.
Comparative example 1
The flotation research is carried out on certain lead-zinc ore in Yunnan, wherein the main minerals comprise sphalerite, galena and pyrite, the zinc grade is 22.4 percent, the lead grade is 6.8 percent, the sulfur grade is 11.4 percent, the content of the other metal minerals is low, and the gangue minerals mainly comprise calcite, dolomite and the like.
The flotation method of the ore comprises the following steps:
(1) grinding: grinding the raw ore to a fineness of 68 percent of-0.074 mm;
(2) lead and sulfur mixed flotation: adding 60g/t of sodium sulfide, 1600g/t of zinc sulfate, 15g/t of second oil and 90g/t of ethidium into the mixed flotation of lead and sulfur, and obtaining lead and sulfur bulk concentrate through 2 times of roughing and 2 times of scavenging;
(3) lead and sulfur separation and flotation: adding 5000g/t lime, stirring for 2 minutes, adding 20g/t of ethidium and nitrogen, and obtaining lead concentrate through 1 time of roughing, 3 times of fine concentration and 3 times of scavenging.
Comparative example 2
The flotation research is carried out on certain lead-zinc ore in Yunnan, wherein the main minerals comprise sphalerite, galena and pyrite, the zinc grade is 22.4 percent, the lead grade is 6.8 percent, the sulfur grade is 11.4 percent, the content of the other metal minerals is low, and the gangue minerals mainly comprise calcite, dolomite and the like.
The flotation method of the ore comprises the following steps:
(1) grinding: grinding the raw ore to a fineness of 68 percent of-0.074 mm;
(2) lead and sulfur mixed flotation: adding 60g/t of sodium sulfide, 1600g/t of zinc sulfate, 15g/t of second oil and 90g/t of ethidium into the mixed flotation of lead and sulfur, and obtaining lead and sulfur bulk concentrate through 2 times of roughing and 2 times of scavenging;
(3) lead and sulfur separation and flotation: adding 800g/t of hydrogen peroxide, stirring for 2 minutes, adding 1500g/t of lime, stirring for 2 minutes, adding 20g/t of ethion, and obtaining lead concentrate through 1 time of rough concentration, 2 times of fine concentration and 3 times of scavenging.
Comparative example 3
The flotation research is carried out on certain lead-zinc ore in Yunnan, wherein the main minerals comprise sphalerite, galena and pyrite, the zinc grade is 22.4 percent, the lead grade is 6.8 percent, the sulfur grade is 11.4 percent, the content of the other metal minerals is low, and the gangue minerals mainly comprise calcite, dolomite and the like.
The flotation method of the ore comprises the following steps:
(1) grinding: grinding the raw ore to a fineness of 68 percent of-0.074 mm;
(2) lead and sulfur mixed flotation: adding 60g/t of sodium sulfide, 1600g/t of zinc sulfate, 15g/t of second oil and 90g/t of ethidium into the mixed flotation of lead and sulfur, and obtaining lead and sulfur bulk concentrate through 2 times of roughing and 2 times of scavenging;
(3) lead and sulfur separation and flotation: adding 400g/t of fulvic acid and 1500g/t of lime, stirring for 2 minutes, adding 20g/t of ethidium and nitrogen, and obtaining lead concentrate through 1 time of roughing, 3 times of fine concentration and 2 times of scavenging.
Comparative example 4
The flotation research is carried out on certain lead-zinc ore in Yunnan, wherein the main minerals comprise sphalerite, galena and pyrite, the zinc grade is 22.4 percent, the lead grade is 6.8 percent, the sulfur grade is 11.4 percent, the content of the other metal minerals is low, and the gangue minerals mainly comprise calcite, dolomite and the like.
The flotation method of the ore comprises the following steps:
(1) grinding: grinding the raw ore to a fineness of 68 percent of-0.074 mm;
(2) lead and sulfur mixed flotation: adding 60g/t of sodium sulfide, 1600g/t of zinc sulfate, 15g/t of second oil and 90g/t of ethidium into the mixed flotation of lead and sulfur, and obtaining lead and sulfur bulk concentrate through 2 times of roughing and 2 times of scavenging;
(3) lead and sulfur separation and flotation: adding 1200g/t of fulvic acid, stirring for 2 minutes, adding 20g/t of ethidium chloride, and obtaining lead concentrate through 1 time of roughing, 3 times of fine concentration and 3 times of scavenging.
Comparative example 5
The flotation research is carried out on certain lead-zinc ore in Yunnan, wherein the main minerals comprise sphalerite, galena and pyrite, the zinc grade is 22.4 percent, the lead grade is 6.8 percent, the sulfur grade is 11.4 percent, the content of the other metal minerals is low, and the gangue minerals mainly comprise calcite, dolomite and the like.
The flotation method of the ore comprises the following steps:
(1) grinding: grinding the raw ore to a fineness of 68 percent of-0.074 mm;
(2) lead and sulfur mixed flotation: adding 60g/t of sodium sulfide, 1600g/t of zinc sulfate, 15g/t of second oil and 90g/t of ethidium into the mixed flotation of lead and sulfur, and obtaining lead and sulfur bulk concentrate through 2 times of roughing and 2 times of scavenging;
(3) separating and floating lead and sulfur: adding 1600g/t of hydrogen peroxide, stirring for 2 minutes, adding 20g/t of ethidium and nitrogen, and obtaining lead concentrate through 1 time of roughing, 3 times of fine concentration and 3 times of scavenging.
Comparative example 6
The flotation research is carried out on certain lead-zinc ore in Yunnan, wherein the main minerals comprise sphalerite, galena and pyrite, the zinc grade is 22.4 percent, the lead grade is 6.8 percent, the sulfur grade is 11.4 percent, the content of the other metal minerals is low, and the gangue minerals mainly comprise calcite, dolomite and the like.
The flotation method of the ore comprises the following steps:
(1) grinding: grinding the raw ore to a fineness of 68 percent of-0.074 mm;
(2) lead and sulfur mixed flotation: adding 60g/t of sodium sulfide, 1600g/t of zinc sulfate, 15g/t of second oil and 90g/t of ethidium into the mixed flotation of lead and sulfur, and obtaining lead and sulfur bulk concentrate through 2 times of roughing and 2 times of scavenging;
(3) lead and sulfur separation and flotation: adding 800g/t of hydrogen peroxide, stirring for 2 minutes, adding 600g/t of fulvic acid, stirring for 2 minutes, adding 20g/t of ethidium chloride, and obtaining lead concentrate through 1 time of rough concentration, 3 times of fine concentration and 3 times of scavenging.
The test results are given in the following table:
compared with the comparative example 1, the grade of the lead concentrate obtained in the example 1 of the invention is improved by 1.09 percent, the iron recovery rate is reduced by 0.64 percent, and the quality of the lead concentrate is improved. From the results of comparative example 2, it can be seen that the grade of the lead concentrate obtained by hydrogen peroxide plus lime is reduced by 6.09 percentage points and the iron content is increased by 3.67 percentage points compared with example 1, and the inhibition effect on pyrite is poor. From the results of comparative example 3, it can be seen that the grade of the lead concentrate obtained by fulvic acid and lime is reduced by 0.10 percent compared with that of example 1, and the lead recovery rate is reduced by 5.81 percent, which indicates that the lead ore has stronger inhibiting effect.
Therefore, the hydrogen peroxide-fulvic acid-lime combined inhibitor adopted in the embodiment 1 can realize the high-efficiency separation of galena and pyrite, can obtain high-grade and high-recovery lead concentrate, and simultaneously reduces the lime consumption by 3500 g/t. The flotation separation efficiency is low and the entrainment is serious by adopting the existing single lime flotation method; the inhibition effect of hydrogen peroxide and lime on pyrite is weak; the fulvic acid and lime have strong inhibition effect on pyrite, and lead recovery rate is reduced due to inhibition of galena.
The surfaces of the galena and the pyrite in the lead-sulfur bulk flotation concentrate are adsorbed with a large amount of hydrophobic xanthate, and when single lime is used as an inhibitor, a high dosage is required to generate an effective inhibiting effect on the pyrite. According to the invention, firstly, hydrogen peroxide is used for oxidizing and desorbing the xanthate on the surface of the pyrite, and meanwhile, fulvic acid and lime are selectively adsorbed on the surface of the pyrite under the synergistic effect, so that the selective inhibition effect on the pyrite is strengthened.
The results show that the combined inhibitor 'hydrogen peroxide-fulvic acid-lime' adopted in the invention has obvious effect of inhibiting pyrite, and meanwhile, the cost is low, and the environmental protection has little influence on the environment.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (9)
1. A flotation method of lead-sulfur bulk concentrate and a pyrite combined inhibitor are characterized in that: the flotation method of the lead-sulfur bulk concentrate comprises the following steps:
(1) grinding ore: grinding the raw ore to obtain ore pulp with preset fineness;
(2) lead and sulfur mixed flotation: adding sodium sulfide, zinc sulfate, ethidium xanthate and second oil into the ore pulp to perform lead-sulfur mixed flotation to obtain lead-sulfur mixed concentrate and lead-sulfur flotation tailings;
(3) lead and sulfur separation and flotation: adding hydrogen peroxide, fulvic acid and lime into the lead-sulfur bulk concentrate pulp, and then adding a collecting agent for lead flotation to obtain lead concentrate and sulfur concentrate.
2. The flotation method of lead-sulfur bulk concentrate according to claim 1, characterized in that: the ore pulp with the preset fineness is ground to 60-85% when the ore pulp with the preset fineness is-74 mu m.
3. The flotation method of lead-sulfur bulk concentrate according to claim 1, characterized in that: the lead and sulfur mixed flotation comprises 1-2 times of roughing and 2-3 times of scavenging.
4. The flotation method of lead-sulfur bulk concentrate according to claim 1, characterized in that: and (3) firstly adding hydrogen peroxide into the lead-sulfur bulk concentrate for stirring, and then simultaneously adding fulvic acid and lime for stirring.
5. The flotation method of lead-sulfur bulk concentrate according to claim 1 or 4, characterized in that: the hydrogen oxide is added into the ore pulp and stirred for 2-5 minutes, and the fulvic acid and the lime are simultaneously added into the ore pulp and stirred for 2-5 minutes.
6. The flotation method of lead-sulfur bulk concentrate according to claim 5, characterized in that: compared with raw ore, the dosage of hydrogen peroxide is 100-1000 g/t, the dosage of fulvic acid is 100-500 g/t, the dosage of lime is 1000-2000 g/t, the pH value of ore pulp is more than 11, and the potential of the ore pulp is less than-120 mV.
7. The flotation method of lead-sulfur bulk concentrate according to claim 1, characterized in that: and (3) lead and sulfur separation and flotation comprise 1-2 times of roughing, 2-4 times of fine separation and 2-3 times of scavenging.
8. The flotation method of lead-sulfur bulk concentrate according to claim 1, characterized in that: and (4) taking ethion as a collecting agent in the step (3).
9. The pyrite combination inhibitor of the lead-sulfur bulk concentrate of claim 1, wherein: the pyrite combination inhibitor comprises hydrogen peroxide, fulvic acid and lime.
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