CN114602638B - Method for step-by-step recovery of copper minerals from dripping secondary copper ores - Google Patents
Method for step-by-step recovery of copper minerals from dripping secondary copper ores Download PDFInfo
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 48
- 239000010949 copper Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000011084 recovery Methods 0.000 title claims abstract description 31
- 229910001779 copper mineral Inorganic materials 0.000 title claims abstract description 27
- 238000005188 flotation Methods 0.000 claims abstract description 103
- 238000007667 floating Methods 0.000 claims abstract description 10
- 239000011362 coarse particle Substances 0.000 claims abstract description 6
- 239000012141 concentrate Substances 0.000 claims description 48
- 239000002245 particle Substances 0.000 claims description 35
- 238000000926 separation method Methods 0.000 claims description 13
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 11
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 11
- 239000004571 lime Substances 0.000 claims description 11
- 230000002000 scavenging effect Effects 0.000 claims description 10
- TUZCOAQWCRRVIP-UHFFFAOYSA-N butoxymethanedithioic acid Chemical compound CCCCOC(S)=S TUZCOAQWCRRVIP-UHFFFAOYSA-N 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 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 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 4
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims 1
- 229910052951 chalcopyrite Inorganic materials 0.000 abstract description 19
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 abstract description 19
- 229910052947 chalcocite Inorganic materials 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 12
- 230000002829 reductive effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 21
- 239000011707 mineral Substances 0.000 description 21
- 239000005995 Aluminium silicate Substances 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 235000012211 aluminium silicate Nutrition 0.000 description 5
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 5
- 229910052683 pyrite Inorganic materials 0.000 description 5
- 239000011028 pyrite Substances 0.000 description 5
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 229910052612 amphibole Inorganic materials 0.000 description 4
- 241000283070 Equus zebra Species 0.000 description 3
- QRJOYPHTNNOAOJ-UHFFFAOYSA-N copper gold Chemical compound [Cu].[Au] QRJOYPHTNNOAOJ-UHFFFAOYSA-N 0.000 description 3
- BWFPGXWASODCHM-UHFFFAOYSA-N copper monosulfide Chemical compound [Cu]=S BWFPGXWASODCHM-UHFFFAOYSA-N 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000010438 granite Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- -1 Cu-Au-Mo Chemical class 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(I) oxide Inorganic materials [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 description 1
- LBJNMUFDOHXDFG-UHFFFAOYSA-N copper;hydrate Chemical compound O.[Cu].[Cu] LBJNMUFDOHXDFG-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000003462 vein Anatomy 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
-
- 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
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for recovering copper minerals, in particular to a method for recovering copper minerals from a dripping secondary copper-bearing ore step by step. S1, grinding a section of ore; s2, desliming flotation; s3, semi-preferential floatation; s41, preferentially selecting; s42, mixing flotation; s5, coarse particle flotation; s6, three-stage grinding; s7, separating and floating. According to the invention, after primary ore grinding, the ore mud is removed by adopting a process of preferential desliming, so that the influence of the ore mud on the subsequent flotation effect is reduced; according to the hardness characteristics of ores, a step recovery process is adopted, the recovery of chalcocite, fine chalcopyrite and coarse chalcopyrite is sequentially realized, the phenomena of overgrinding and undergrinding are avoided, the recovery rate of copper minerals is improved, and the application prospect is wide.
Description
Technical Field
The invention relates to the technical field of copper mineral recovery, in particular to a method for recovering copper minerals step by step from a dripping secondary copper-bearing ore.
Technical Field
The porphyry copper-Jin Kuangchuang is a main source of metals such as Cu-Au-Mo, provides more than 60 copper metal resources in the world, is always the first choice for mining company exploration and is also the focus of attention of mineral deposit students. The porphyry type copper-Jin Kuangchuang is classified into various types from lithology, mainly neutral calcium alkalinity (quartz amphibole), acid calcium alkalinity (granite amphibole, quartz amphibole) and the like. The porphyry copper-gold ore deposit also causes various differences between the mineral deposit species and the mineral content due to differences in the ore background, the sources and migration of the ore-forming substances, the mechanism of precipitation of the ore-forming hydrothermal solution, and the like.
For some calcium-alkali zebra copper gold mine strip mines, shallow secondary dribbling ores have the characteristics of weathering, severe mud, higher content of clay minerals such as kaolin and the like, and the copper minerals have the following problems in the recovery process: 1. because the raw ore primary slime, namely kaolin, has higher content and argillaceous minerals, the argillization is easy to generate in the ore grinding process, and the grade and recovery rate of copper concentrate are affected; 2. the fineness of the second-stage grinding is insufficient, part of chalcopyrite is relatively difficult to grind, coarse ore particles in tailings after mixed flotation contain higher copper, and the recovery rate of copper minerals is affected; 3. the mixed rough concentrate is completely subjected to regrinding operation, and chalcocite is easy to overgrind in the regrinding process, so that copper and sulfur separation is difficult, the loss rate of fine-particle copper in copper and sulfur separation tailings is high, and the overall copper recovery rate is low.
Disclosure of Invention
In order to solve the problems, the invention provides a method for recovering copper minerals from the dripping secondary copper-bearing ores step by step.
The invention adopts the following technical scheme:
a method for stepwise recovery of copper minerals from a dripping secondary copper bearing ore comprising the steps of:
s1, grinding: feeding raw ore into a first-stage ball mill for grinding, and feeding ore pulp containing ore particles with the particle size smaller than 2mm generated by grinding into desliming flotation;
s2, desliming flotation: the mass concentration of the S1 ore pulp is regulated to 15%, 20g/t of raw ore No. 2 oil is added for desliming flotation, flotation foam is discarded as tailings 1, and desliming concentrate enters semi-preferential flotation operation for flotation;
s3, semi-preferential flotation: regulating the pH value of desliming concentrate in S2 to be 9.5, adding 20g/t of Z-200 of raw ore for flotation, wherein semi-preferential flotation froth enters preferential concentration, and semi-preferential flotation tailings enter mixed flotation;
s41, preferentially selecting: s3, carrying out semi-preferential flotation froth preferential concentration to obtain copper concentrate 1 and middling 1;
s42, mixing flotation: adding butyl xanthate and No. 2 oil into S3 semi-preferential flotation tailings to perform mixed flotation to obtain mixed rough concentrate, and enabling the mixed flotation tailings to enter rough particle flotation operation;
s5, coarse particle flotation: classifying the mixed flotation tailings in the step S4, wherein the mixed flotation tailings with the particle size of more than or equal to 0.15mm enter a hydraulic flotation machine for flotation, the flotation concentrate of the hydraulic flotation machine enters three-stage ore grinding operation, and the flotation tailings of the hydraulic flotation machine and the mixed flotation tailings with the particle size of less than 0.15mm are discarded as tailings 2;
s6, three-stage grinding: mixing the middlings 1 in S41, the mixed rough concentrate in S42 and the hydraulic flotation machine in S5 to float the concentrate, grinding the mixture until the mass of ore particles with the particle size of less than 0.044mm in the ore pulp is not less than 85% of the total mass of the ore in the ore pulp, and then adjusting the pH value of the ore pulp to 12.2;
s7, separating and floating: and S6, separating and floating the ore pulp with qualified pH value, wherein the separating and floating comprises twice concentration and once scavenging, the concentrate obtained by concentration is copper concentrate 2, and the tailings obtained by scavenging, namely tailings 3, are discarded.
Preferably, in the step S1, ore pulp after ore grinding is classified by adopting a cyclone, and ore particles with the particle size larger than 2mm are returned to the ball mill for secondary ore grinding.
Preferably, the two-stage grinding is specifically: and (3) after secondary ore grinding, the ore pulp enters a cyclone for classification, ore pulp with the ore particle mass of less than 60% of the total ore mass in the ore pulp and with the particle size of less than 0.074mm is obtained through classification, the ore pulp enters S3 for semi-preferential floatation operation, and the residual sand setting returns to the ball mill for regrinding.
Preferably, in the step S1, a combination regulator is further added into the ball mill, wherein the combination regulator is 200g/t of raw ore of sodium humate and 100g/t of raw ore of sodium sulfide.
Preferably, in step S41, lime is added to the flotation machine to adjust the pH to 11 to 11.5.
Preferably, in step S42, the addition amount of the butyl xanthate and the No. 2 oil is 40g/t of raw ore.
Preferably, the pH value is adjusted by lime, wherein the lime addition amount in the step S3 is 200g/t of raw ore, and the lime addition amount in the step S6 is 1500g/t of raw ore.
Preferably, in step S7, the twice fine selection and one fine sweep are specifically: s6, carrying out first concentration on the ore pulp with qualified pH value to obtain concentrate and tailings, and carrying out second concentration on the concentrate to obtain copper concentrate 2 and tailings; and separating and scavenging the tailings to obtain middlings 2 and tailings 3.
Preferably, the tailings and middlings 2 are combined, and enter step S6 to perform three-stage grinding.
Preferably, 5g/t of collecting agent Z-200 of raw ore is added into the ore pulp in the first refining.
The invention has the beneficial effects that:
1) The primary slime in the secondary dribbling ore, namely kaolin, has higher content, and argillaceous minerals have higher content, so that the argillization is easy to generate in the ore grinding process, and the slime covers the surface of useful minerals, thereby not only consuming medicaments, but also affecting the grade and recovery rate of copper concentrate. After one section of ore grinding, the method adopts the preferential desliming flotation process, so that the influence of the ore slime on the subsequent flotation effect can be reduced.
2) Copper minerals mainly comprise chalcopyrite and chalcocite, the chalcopyrite is unevenly embedded in granularity, part of the chalcopyrite is closely symbiotic with gangue minerals, pyrite and the like, and the chalcopyrite is relatively difficult to float and can be dissociated only by fine grinding. The chalcocite embedded granularity is relatively coarse, the floatability is good, but the overgrinding phenomenon is easy to generate in the ore grinding process. And copper ions generated after the chalcocite is overground have an activating effect on gangue minerals such as pyrite, so that the difficulty of separating copper and sulfur minerals is increased. According to the floatability and the embedded granularity characteristics of the ore, a step recovery process is adopted, namely, under the condition of coarse grinding, chalcocite with better floatability is subjected to preferential floatation, so that adverse influence of overgrinding on floatation of the chalcocite is reduced; secondly, the grinding fineness is improved, and chalcopyrite with relatively coarse embedding granularity is recovered in floatation; and finally, finely grinding and recycling fine-particle chalcopyrite which is closely symbiotic with gangue minerals and pyrite, so that sequential recycling of chalcocite, fine-particle chalcopyrite and coarse-particle chalcopyrite is realized, overgrinding and undergrinding phenomena are avoided, and the recycling rate of copper minerals is improved.
3) Classifying the mixed flotation tailings, and carrying out high-concentration flotation on coarse-grain minerals with grain diameters larger than 0.15mm by adopting a hydraulic flotation machine, so as to realize recovery of coarse-grain copper minerals.
Drawings
FIG. 1 is a schematic diagram of a copper mine recovery process in the prior art;
FIG. 2 is a schematic flow chart of a step recovery method provided by the invention.
Detailed Description
The technical scheme of the invention is described in more detail below with reference to examples.
Example 1
Certain strip mines belong to the typical calcic-alkaline zebra type copper gold ore deposit, and the ore types are granite amphibole and flash length Ban Yan. Copper minerals in the primary ore are mainly chalcopyrite, and a very small amount of copper ores are mainly in a fine vein dip-dyeing shape; the non-primary ore mainly comprises chalcocite, a small amount or trace amount of cuprite, native copper and the like. The ore is mainly in a speckled or speckled-like structure, the ore is mainly in a block-like structure, and the cobble structure is rarely formed. The dribbling ore is characterized by serious weathering and mud, and has higher content of mud minerals such as kaolin and the like; copper minerals chalcocite and chalcopyrite are mainly, and chalcocite embedding granularity is relatively coarse; the chalcopyrite embedding granularity is uneven, part of chalcopyrite is tightly combined with pyrite, and the floatability is good; part of chalcopyrite and gangue minerals are closely symbiotic, and are relatively difficult to float.
The prior art is adopted in a certain open-air copper ore dressing plant to recover copper ore, and mainly adopts mixed flotation and mixed rough concentrate regrinding and recleaning, and the screening process is shown in figure 1. The method has the following problems:
(1) The primary slime, namely kaolin, cannot be removed, so that the muddy minerals in the grinding are muddy, and the surfaces of the useful minerals are covered. Affecting copper concentrate grade and recovery. (2) The fineness of the second-stage grinding is insufficient, part of chalcopyrite is relatively difficult to grind, copper in ore particles with the particle size exceeding 0.12mm in the mixed flotation tailings is high, and the recovery rate of copper minerals is affected; the particle size and composition analysis of the mixed flotation tailings is shown in table 1 below. (3) The mixed rough concentrate is totally subjected to regrinding operation, overgrinding is generated on chalcocite in the regrinding process, so that copper and sulfur separation is difficult, and copper loss rate of less than 10 mu m size fraction in copper and sulfur separation tailings is high; the particle size and composition analysis of the copper sulphur separation tailings are shown in table 2 below.
Copper losses of different degrees exist in both the mixed roughing tailings and the separated tailings, and finally, the copper recovery rate is not high.
TABLE 1 analysis results of Mixed flotation tailings%
TABLE 2 analysis results of copper-sulfur separation tailings%
The step recovery method provided by the invention is adopted to recover copper minerals, the process flow is shown in figure 2, and the specific steps are as follows:
s1, primary grinding: raw ore is sent into a ball mill, sodium humate and sodium sulfide are added for grinding, and the ore discharge of the ball mill is classified by a cyclone. The cyclone overflow enables ore pulp containing ore particles with the particle size smaller than 2mm generated by ore grinding to enter desliming flotation; and (5) the sand setting with the grain size of more than 2mm enters a second-stage grinding.
S2, desliming flotation: the ore particles with the particle size smaller than 2mm are mostly primary ore slime, the ore pulp concentration is adjusted to be about 15%, 20g/t of raw ore No. 2 oil, namely, loose alcohol oil is added for desliming flotation, a flotation foam product is discarded as tailings 1, and desliming concentrate enters semi-preferential flotation operation for flotation and copper recovery.
In the step S1, the second stage grinding specifically includes: the sand setting with the grain size of more than 2mm enters a ball mill for secondary grinding, ore pulp enters a cyclone for classification, qualified ore pulp with the grain size of less than 0.074mm and the quality of not less than 60% of the total ore mass in the ore pulp is classified, the qualified ore pulp also enters S3 for semi-preferential floatation operation, and the residual sand setting returns to the ball mill for regrinding.
S3, semi-preferential flotation: and (3) merging the S2 desliming concentrate and the secondary ore grinding qualified ore pulp, adding lime according to 200g/t of raw ore to keep the pH value of the merged ore pulp at about 9.5, adding 20g/t of raw ore Z-200 for flotation, enabling semi-preferential flotation froth to enter preferential concentration, and enabling semi-preferential flotation tailings to enter mixed flotation.
S41, preferentially selecting: s3, carrying out preferential concentration on semi-preferential flotation froth in a flotation machine to obtain copper concentrate 1 and middling 1, wherein lime is required to be added for preferential concentration to adjust the pH value of ore pulp to 11-11.5;
s42, mixing flotation: butyl xanthate and No. 2 oil are respectively added into the S3 semi-preferential flotation tailings according to the ratio of 40g/t of raw ore to carry out mixed flotation, so as to obtain mixed rough concentrate, the mixed rough concentrate enters three-stage ore grinding operation, and the mixed flotation tailings enter coarse particle flotation operation.
S5, coarse particle flotation: classifying the mixed flotation tailings in the step S4, wherein the mixed flotation tailings with the particle size of more than or equal to 0.15mm enter a hydraulic flotation machine for flotation, the flotation concentrate of the hydraulic flotation machine enters three-stage ore grinding operation, and the mixed flotation tailings with the particle size of less than 0.15mm are discarded as tailings 2;
s6, three-stage grinding: the mixed rough concentrate in middlings 1 and S42 in the mixed S41 and the hydraulic flotation machine in the S5 are adopted to carry out flotation on the concentrate, a vertical mill is adopted to grind the ore until the mass of ore particles with the particle size of less than 0.044mm in ore pulp is not less than 85% of the total mass of ore in the ore pulp, lime is added into the vertical mill according to the amount of 1500g/t of raw ore, and the pH value of the ore pulp is adjusted to about 12.2.
S7, separating and floating: and S6, separating and floating the ore pulp with qualified pH value by adopting a separation and floating process of twice concentration and once scavenging, and inhibiting pyrite from floating chalcopyrite. The concentrate obtained by concentration is copper concentrate 2, and the tailings obtained by scavenging, namely tailings 3, are discarded.
The twice fine selection and once fine scavenging specifically comprises the following steps: and S6, adding 5g/t of collecting agent Z-200 of raw ore into the ore pulp with qualified pH value, and carrying out first concentration to obtain concentrate and tailings. Carrying out secondary concentration on the concentrate to obtain copper concentrate 2 and tailings; and separating and scavenging the tailings to obtain middlings 2 and tailings 3. Wherein the tailings and middlings 2 are combined, and the process returns to the step S6 to continue three-stage grinding until the tailings are qualified.
The mineral separation indexes of random three batches of minerals of the open-pit copper ore dressing plant are analyzed by the existing recovery method and the method, the results of the existing mineral separation indexes are shown in table 3, and the mineral separation indexes after modification by using the method are shown in table 4.
TABLE 3 mineral separation index% before modification
Table 4 modified beneficiation index%
According to the mineral property characteristics, the invention adopts the technological processes of desliming in advance, step-by-step flotation, regrinding of the rough concentrate and copper-sulfur separation, thereby remarkably improving the grade of the copper concentrate and realizing the effective recovery of chalcocite and chalcopyrite in the zebra copper-Jin Kuangchuang.
The above embodiments are only for illustrating the technical scheme of the present invention, and are not limiting to the present invention; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for the fractional recovery of copper minerals from a dripping secondary copper bearing ore comprising the steps of:
s1, primary ore grinding: raw ore is sent into a ball mill for grinding, and ore pulp containing ore particles with the particle size smaller than 2mm generated by grinding enters desliming flotation; classifying the ore pulp after ore grinding by adopting a cyclone, and returning ore particles with the particle size larger than 2mm to a ball mill for secondary ore grinding;
s2, desliming flotation: the mass concentration of the S1 ore pulp is regulated to 15%, the No. 2 oil of 20g/t raw ore is added for desliming flotation, flotation foam is discarded as tailings 1, and desliming concentrate enters semi-preferential flotation operation for flotation;
s3, semi-preferential flotation: regulating the pH value of desliming concentrate in S2 to be 9.5, adding Z-200 of 20g/t raw ore for flotation, wherein semi-preferential flotation froth enters preferential concentration, and semi-preferential flotation tailings enter mixed flotation;
s41, preferentially selecting: s3, sending the semi-preferential flotation froth into a flotation machine for preferential concentration to obtain copper concentrate 1 and middling 1 respectively;
s42, mixed flotation: adding butyl xanthate and No. 2 oil into S3 semi-preferential flotation tailings to perform mixed flotation to obtain mixed rough concentrate, and enabling the mixed flotation tailings to enter rough particle flotation operation;
s5, coarse particle flotation: classifying the mixed flotation tailings in the step S4, wherein the mixed flotation tailings with the particle size larger than or equal to 0.15 and mm enter a hydraulic flotation machine for flotation, the flotation concentrate of the hydraulic flotation machine enters three-stage ore grinding operation, and the flotation tailings of the hydraulic flotation machine and the mixed flotation tailings with the particle size smaller than 0.15 and mm are discarded as tailings 2;
s6, three-stage ore grinding: mixing the mixed rough concentrate in the middlings 1 and the mixed rough concentrate in the middlings 42 in the S41 and the hydraulic flotation machine in the S5 to float the concentrate, grinding the mixed rough concentrate until the mass of ore particles with the particle size of less than 0.044 and mm in the ore pulp is not less than 85 percent of the total mass of the ore in the ore pulp, and then adjusting the pH value of the ore pulp to 12.2;
s7, separation flotation: and S6, separating and floating the ore pulp with qualified pH value, wherein the separating and floating comprises twice concentration and once scavenging, the concentrate obtained by concentration is copper concentrate 2, and the tailings obtained by scavenging, namely tailings 3, are discarded.
2. The method for stepwise recovery of copper minerals from a dripping secondary copper bearing ore according to claim 1, wherein said secondary grinding is specifically: and (3) after secondary ore grinding, the ore pulp enters a cyclone for classification, ore pulp with ore particle mass less than 60% of the total ore mass in the ore pulp and with particle size less than 0.074 and mm is classified, the ore pulp enters S3 for semi-preferential floatation operation, and the residual sand setting returns to the ball mill for regrinding.
3. The method for stepwise recovery of copper minerals from a dripping secondary copper bearing ore according to claim 1 or 2, wherein in step S1, a combination regulator is further added to said ball mill, said combination regulator being sodium humate and sodium sulfide, wherein the addition amount of sodium humate is 200g/t of the raw ore, and the addition amount of sodium sulfide is 100g/t of the raw ore.
4. The method for stepwise recovery of copper minerals from a dripping secondary copper-bearing ore according to claim 1, wherein in step S41, lime is added to the flotation machine to adjust the pH to 11 to 11.5.
5. The method for stepwise recovering copper minerals from a dripping secondary copper bearing ore as defined in claim 1, wherein in step S42, said butyl xanthate and No. 2 oil are added in an amount of 40g/t raw ore.
6. The method for stepwise recovery of copper minerals from a dripping secondary copper bearing ore according to claim 1, wherein said pH is adjusted with lime, wherein the lime addition in step S3 is 200g/t of raw ore and the lime addition in step S6 is 1500g/t of raw ore.
7. The method for stepwise recovery of copper minerals from a dripping secondary copper-bearing ore according to claim 1, wherein in step S7, said twice refining and one refining are specifically: s6, carrying out first concentration on the ore pulp with qualified pH value to obtain concentrate and tailings, and carrying out second concentration on the concentrate to obtain copper concentrate 2 and tailings; and separating and scavenging the tailings to obtain middlings 2 and tailings 3.
8. The method for stepwise recovery of copper minerals from a dripping secondary copper bearing ore according to claim 7, wherein said tailings and middlings 2 are combined and fed to step S6 for three-stage grinding.
9. A method for stepwise recovery of copper minerals from a dripping secondary copper bearing ore according to claim 7 wherein said primary concentrate slurry is supplemented with a collector Z-200 of 5g/t of the primary ore.
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