AU2017421972B2 - Double-region flotation method for copper-cobalt sulfide ore in industrial production - Google Patents

Double-region flotation method for copper-cobalt sulfide ore in industrial production Download PDF

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AU2017421972B2
AU2017421972B2 AU2017421972A AU2017421972A AU2017421972B2 AU 2017421972 B2 AU2017421972 B2 AU 2017421972B2 AU 2017421972 A AU2017421972 A AU 2017421972A AU 2017421972 A AU2017421972 A AU 2017421972A AU 2017421972 B2 AU2017421972 B2 AU 2017421972B2
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cleaning
zone
roughing
slurry
ore
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AU2017421972A1 (en
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Jianping DUAN
Jingwen DUAN
Jianan LU
Yunqi PENG
Zhentang WANG
Hairui Yang
Enpu ZHANG
Qian Zhang
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WANBAO MINING Ltd
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WANBAO MINING Ltd
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Priority to CN201710547556.6A priority patent/CN107398353B/en
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Priority to PCT/CN2017/102857 priority patent/WO2019006889A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00General arrangement of separating plant, e.g. flow sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00Flotation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00Flotation
    • B03D1/001Flotation agents
    • B03D1/002Inorganic compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00Flotation
    • B03D1/001Flotation agents
    • B03D1/004Organic compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00Flotation
    • B03D1/14Flotation machines
    • B03D1/1406Flotation machines with special arrangement of a plurality of flotation cells, e.g. positioning a flotation cell inside another
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2201/00Specified effects produced by the flotation agents
    • B03D2201/007Modifying reagents for adjusting pH or conductivity
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2201/00Specified effects produced by the flotation agents
    • B03D2201/02Collectors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2201/00Specified effects produced by the flotation agents
    • B03D2201/04Frothers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2201/00Specified effects produced by the flotation agents
    • B03D2201/06Depressants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03DFLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2203/00Specified materials treated by the flotation agents; specified applications
    • B03D2203/02Ores

Abstract

Disclosed is a double-region flotation method for a copper-cobalt sulfide ore in industrial production. The sorting process uses a flotation process flow, wherein the flotation process uses flotation in separate regions, which are divided into two regions, region 1 is mainly used for concentrate index control, and region 2 is used for recovery rate control. The method achieves a high-efficiency recovery for both copper and cobalt elements in the copper-cobalt sulfide ore in the scope of industrial production, and by using the double-region stepwise flotation method, effectively relieves the contradiction between the recovery rate and the concentrate grade in the field of ore dressing, improves the efficiency of quality control, greatly improves the optimization efficiency of the recovery rate and concentrate product index, and achieves the relatively separate control of the grade and the recovery rate.

Description

TWO-ZONED FLOTATION METHOD FOR COPPER-COBALT SULFIDE ORE IN INDUSTRIAL PRODUCTION
FIELD OF THE INVENTION
[0001 ] This invention relates to the field of mineral processing engineering, and in particular to a two-zoned flotation method for copper-cobalt sulfide ore in industrial production.
BACKGROUND OF THE INVENTION
[0002] There are few mature industrial applications in China for the beneficiation of copper-cobalt sulfide ore. Recovery rate and concentrate grade are two interrelated and contradictory indexes in the field of beneficiation. A problem lies in that it is not easy to relatively separately control the concentrate grade and the recovery rate.
SUMMARY OF THE INVENTION
[0003] The technical problem to be solved by the present invention is to provide a tow-zoned flotation method for copper-cobalt sulfide ore in industrial production, which allows the efficient recovery of copper and cobalt from copper-cobalt sulfide ore in industrial production. A two-zoned, stepwise flotation method effectively alleviates the contradiction between the recovery rate and the concentrate grade in the field and increases the efficiency of quality control. Through this method, the efficiency of optimizing the recovery rate and the concentrate grade is greatly improved, and the relatively separate control of the concentrate grade and the recovery rate can be achieved.
[0004] The technical solutions of the present application are as follows:
[0005] A two-zoned flotation method for copper-cobalt sulfide ore in industrial production, characterized in that it comprises the following steps:
[0006] 1) step I: coarse grinding
[0007] pouring ore transported by a vehicle directly through a raw ore grid screen into an ore storehouse, feeding the ore into a jaw crusher through a heavy plate feeder; transferring a coarse grinding product to an intermediate ore pile through a belt conveyor;
[0008] 2) step II: intermediate ore pile stacking
[0009] providing an intermediate ore pile to act as an ore-supplying buffer for a separation process to ensure ore supply during maintenance shutdown of grinding; this is due to an operating system for coarse grinding being different from that for separation;
[0010] 3) step III: grinding
[0011] transporting ore from an intermediate ore pile to a semi-autogenous grinding mill by a belt for grinding; transferring a sieved material to a hydrocyclone by a slurry pump for classification after the sieved material enters a grinding sump; transferring sediment to a ball mill for grinding; transferring a product of ball milling to a hydrocyclone by a slurry pump for classification after the product of ball milling enters a grinding sump; sending an overflow product for flotation, transferring sediment to a ball mill for grinding;
[0012] 4) step IV: flotation
[0013] adopting a zoned flotation process that is divided into two zones: zone I is mainly for controlling a concentrate index, zone II is for controlling recovery rate, zone I and zone II respectively comprises a mixing bucket, namely al# mixing bucket and a 2# mixing bucket, each zone respectively produces a concentrate product, namely concentrate 1 and concentrate 2;
[0014] adopting a “two roughing, one scavenging, and three cleanings” process for a flotation operation in zone I:
[0015] adding a reagent for zone I roughing I to a 1# mixing bucket; introducing an overflow slurry of a hydrocyclone to a roughing I flotation cell after the overflow slurry enters al# mixing bucket and is thoroughly mixed, the 1# mixing bucket is a starting point of zone 1; introducing slurry of a roughing I operation to a roughing II operation; introducing slurry of a roughing II operation to a scavenging operation; introducing froths of a roughing I operation and a roughing II operation to a cleaning operation area in zone 1; allowing froth from a scavenging operation to return to a roughing II operation and slurry to go to a starting position of zone II, which is a 2# mixing bucket; cleaning zone I involves three cleaning processes: introducing froth of a cleaning I operation to a cleaning II operation, allowing slurry to return to a roughing I operation, introducing froth of a cleaning II operation to a cleaning III operation, adding no reagent in a cleaning III operation, allowing slurries from a cleaning II operation and a cleaning III operation to return to cleaning I and cleaning II separately and sequentially; froth of a cleaning III operation is concentrate I product.
[0016] The reagent for zone I roughing I is added to a 1//mixing bucket, and includes 600 g/t of lime as a pH adjuster to keep the pH of slurry within 9.5 - 10.0, 150 g/t of sodium humate as an inhibitor, 70 g/t of 2# oil as a frothing agent, and 60 g/t of butyl xanthate as a collector.
[0017] The reagent for zone I roughing II added includes 70 g/t of sodium humate as an inhibitor, 24 g/t of 2# oil as a frothing agent, and 35 g/t of butyl xanthate as a collector.
[0018] Only 25 g/t of butyl xanthate as a collector is added in the scavenging operation of zone I.
[0019] Only 40 g/t of sodium humate as an inhibitor is added in the cleaning I operation of zone I.
[0020] Only 20 g/t of sodium humate as an inhibitor is added in the cleaning II operation of zone I.
[0021 ] Adopting a “one roughing, two scavengings, and three cleanings” process for a flotation operation in zone II:
[0022] adding a reagent for zone II roughing to a 2# mixing bucket; introducing slurry to a roughing I flotation cell after the slurry is thoroughly mixed; introducing slurry of a roughing operation to a scavenging I operation; introducing slurry to a zone II cleaning operation area, introducing slurry of a scavenging I operation to a scavenging II operation, allowing froth to return to a roughing operation, adding no flotation reagent in a scavenging II operation, introducing slurry of scavenging II to a tailings pond, transporting the slurry of scavenging II to a tailings thickener by a slurry pump; a cleaning operation in zone II is divided into three cleaning processes, introducing froth from cleaning I to cleaning II, allowing slurry to return to a roughing operation, introducing froth of a cleaning II operation to cleaning III; allowing slurries of a cleaning II operation and a cleaning III operation to return to cleaning I and cleaning II separately and sequentially; froth of cleaning III is concentrate II product.
[0023] The reagent for zone II roughing I includes butyl xanthate as a collector and sodium humate as an inhibitor in an amount of 20 g/t and 30 g/t respectively.
[0024] Only 10 g/t of butyl xanthate as a collector is added to the scavenging I operation of zone II.
[0025] In cleaning I and cleaning II of zone II, only sodium humate as an inhibitor is added in an amount of 15 g/t and 10 g/t respectively.
[0026] The beneficial effects of the present invention are as follows:
[0027] This beneficiation method of copper-cobalt sulfide ore has a simple reagent system and achieves a good separation effect through the optimization of both the process and the ratio of reagents. The beneficiation process of this method is applied in a copper-cobalt mine. Flotation zone I controls a product index, whereas flotation zone II mainly controls the recovery rate. By adapting zoned-flotation and dividing the tasks, the contradiction between recovery rate and concentrate grade in a beneficiation process can be alleviated, which separates the technical solutions for these two goals and facilitates the control of indexes.
BRIEF DESCRIPTION OF THE DRAWINGS
[0028] The present invention has 3 drawings in total.
[0029] FIG. 1 is a diagram showing the devices for the two-zoned flotation method for copper-cobalt sulfide ore according to the present invention.
[0030] FIG. 2 is a diagram showing the steps of the two-zoned flotation method for copper-cobalt sulfide ore according to the present invention.
[0031] FIG. 3 is a flow chart showing the process of the two-zoned flotation method for copper-cobalt sulfide ore according to the present invention.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
[0032] The present invention will be described in further detail below with reference to the drawings and preferred embodiments.
[0033] Embodiment 1
[0034] The type of raw ore targeted is mainly copper-cobalt sulfide ore, of which the average grade of copper is 1.5%, the average grade of cobalt is 0.5%. Its mineralogical characteristics are as follows: copper minerals in the ore mainly include chalcopyrite, followed by porphyrite, chalcocite, a very small amount of natural copper and copper blue, among others; cobalt mineral is carrollite; sulfide minerals are mainly pyrite, among others; gangue minerals mainly include dolomite, quartz, mica, among others; the ore contains a small amount of carbonaceous matter. [0035] Grinding involves a SAB process of semi-autogenous grinding and ball milling.
[0036] The separation process involves flotation. The flotation process is a zoned flotation process which takes place in two zones. Zone 1 is mainly for controlling a concentrate index, whereas zone 2 is for controlling the recovery rate.
[0037] The main process is as follows:
[0038] 1. Coarse grinding
[0039] Raw ore density: 2.73 t/m3, loose factor: 1.5-1.7, moisture content of the ore: 2-5%.
[0040] The coarse crushing station is arranged in the open air. The ore transported by a vehicle is directly poured through a raw ore grid screen into a storehouse.
[0041] The ore is then fed into a jaw crusher through a 1500χ8000 mm heavy plate feeder. [0042] The size of the crusher's feeding port is 850 χ 1100 mm; the particle size of the incoming feed is 0-750 mm; the maximum particle size of the product is 150 mm; the coarse grinding product is transferred to an intermediate ore pile through al# belt conveyor.
[0043] 2. Intermediate ore pile
[0044] As the operating system for grinding is different from that for separation, to ensure ore supply during maintenance shutdown of grinding, an intermediate ore pile is provided to act as an ore-supplying buffer for the separation process.
Main Equipment at the Intermediate Ore Pile:
Name Main technical parameters
Belt conveyor B = 1000, Lh = 198.95 m, a = 8°
Heavy plate feeder 1200x 6000 (width χ length)
Electric hoist Q = 2t
Submerged pump 65ZJLA-B30
LPM7B-450 type air box pulse bag filter Air volume: 12,000 m3/h, resistance: 470 1770 Pa, filtering area: 434 m2, net filtering area: 372 m2
9-26NO11.2D type centrifugal fan Wind volume: 19,966 m3/h, wind pressure: 3225 Pa, rotation speed: 960 r/min
D941W-1C type electric butterfly valve DN630
[0045] 3. Grinding
[0046] The particle size of a semi-autogenous grinding incoming ore is 250-0 mm, P80 = 175mm; the required particle size of the discharged ore is -2mm > 80%, and grinding concentration (average) is 75% - 80%. The discharge end is provided with a double-layer cylindrical sieve (the size of an inner-layer sieve opening is 20 χ 40mm, the size of an outer-layer sieve opening is 6 x 15mm). The sieved material enters a grinding sump and is sent to a hydrocyclone by a slurry pump for classification: the overflow product is sent for flotation; the sediment enters a ball mill for grinding.
[0047] The particle size of the incoming ore for ball milling: P80 = 2mm; grinding concentration (average): 75% -80%; cyclic loading: 300%; rotation speed: 13 r/min; rotation rate: 75%. The grinding product of the ball mill enters the grinding sump (shared with semi-autogenous grinding) and is then pumped into a hydrocyclone by a slurry pump for classification: the overflow product is sent for flotation; the sediment enters a ball mill for grinding.
[0048] The specification of the group of hydrocyclones: Φ500χ10; the amount of incoming feed slurry: 335.7m3/h (taking fluctuation coefficient into account); the weight concentration of the overflow: 30%; overflow fineness: -0.074mm accounts for 80%.
Main Equipment in a Grinding Workshop
Name Main technical parameters
Belt conveyor B= 1000, Lh= 118.0 m, a= 15°
Wet-type semi-autogenous grinding mill Φ5.5x3.0 (EGL)
With a semi-autogenous grinding low-pressure part
Overflow-type ball mill Φ3.8χ6.6 m
With a ball mill low-pressure part
Slurry pump (cyclone feed) 250/200
Group of hydrocyclones Φ500χ6
Electric hoist Q = 2t, H = 15 m
Pipe sampler (raw ore) DN600
Submerged pump 65 (exit)
Car crane Q = 50 t
Car crane Q = 20 t
T35-11NO4 axial fan Wind volume: 3800 m3/h, full pressure: 88 Pa, rotation speed: 1450 r/min
T35-11NO6.3 axial fan Wind volume: 10,472 m3/h, full pressure: 101 Pa, rotation speed: 960 rpm
KF-72LW air-cooled cabinet air conditioner Cooling capacity: 7200 W
Electronic belt scale 0 - 200 t/h
Electromagnetic Flowmeter 0 - 60 m3/h; DN100
Electric regulating butterfly valve DN100
Ultrasonic level meter 0-4m
Pressure transmitter with remote transmission 0-0.12 MPa
Online particle size analyzer -0.074 mm accounts for 65%
Density meter 0 - 40%
[0049] 4. Flotation
[0050] Two operation zones, zone 1 and zone 2 are involved in flotation. Each of the two zones comprises a mixing bucket, namely, al# mixing bucket and a 2# mixing bucket. Each of the two zones produces a concentrate product, namely, concentrate I and concentrate IL The detailed process is described below.
[0051] The flotation operation in zone 1 can be summarized as a “two roughing, one scavenging, and three cleanings” process.
[0052] The overflow slurry from the hydrocyclone enters al# mixing bucket, which is the starting point of zone 1.
[0053] In zone 1 roughing I, reagents are added to the 1# mixing bucket. The reagents include 600 g/t of lime as a pH adjuster to keep the pH of the slurry within 9.5 - 10.0, 150 g/t of sodium humate as an inhibitor, 70 g/t of 2# oil as a frothing agent, and 60 g/t of butyl xanthate as a collector. After the slurry is thoroughly stirred, it enters a roughing I flotation cell. The slurry of the roughing I operation then enters a roughing II operation.
[0054] The reagents added in the roughing II operation are 70 g/t of sodium humate as an inhibitor, 24 g/t of 2# oil as a frothing agent, and 35 g/t of butyl xanthate as a collector.
[0055] The slurry of the roughing II operation goes to scavenging. The froths of the roughing I operation and the roughing II operation go to a cleaning operation area in zone 1.
[0056] In the scavenging operation, only 25 g/t of butyl xanthate as a collector is added. The froth of the scavenging operation returns to the roughing II operation, the slurry goes to the starting position of zone 2, which is the 2# mixing bucket.
[0057] The cleaning operation in zone 1 is divided into three cleaning processes.
[0058] In a cleaning I operation, only 40 g/t of sodium humate as an inhibitor is added. The froth of cleaning I goes to a cleaning II operation, the slurry returns to the roughing I operation.
[0059] Similarly, in cleaning II, only 20 g/t of sodium humate as an inhibitor is added. The froth of cleaning II goes to a cleaning III operation.
[0060] In the cleaning III operation, no reagent is added. The slurries of the cleaning II operation and the cleaning III operation return to cleaning I and cleaning II separately and sequentially. The froth of the cleaning III operation is concentrate I product.
[0061] The flotation operation in zone 2 can be summarized as a “one roughing, two scavengings, and three cleanings” process.
[0062] In a zone 2 roughing operation, reagents are added to the 2# mixing bucket. The reagents include 20g/t g/t of butyl xanthate as a collector and 30 g/t of sodium humate as an inhibitor. After the slurry is thoroughly stirred, it enters a roughing I flotation cell. The slurry of the roughing operation then goes to a scavenging I operation, the slurry goes to a zone 2 cleaning operation area.
[0063] In the scavenging I operation, only 10 g/t of butyl xanthate as a collector is added. The slurry from the scavenging I operation goes to a scavenging II operation, the froth returns to the roughing operation. In the scavenging II operation, no floatation reagent is added. The slurry from scavenging II goes to the tailings pond and is transported to a tailings thickener by a slurry pump
[0064] The cleaning operation in zone 2 is divided into three cleaning processes.
[0065] The froth of a cleaning I operation goes to a cleaning II operation, the slurry returns to the roughing operation. In cleaning I and cleaning II, only sodium humate as an inhibitor is added in an amount of 15 g/t and 10 g/t respectively.
[0066] The froth from the cleaning II operation goes to cleaning III. The slurries of the cleaning II operation and the cleaning III operation return to cleaning I and cleaning II separately and sequentially.
[0067] The froth of cleaning III is concentrate II product.
Main Equipment in a Flotation Workshop
Name Main technical parameters
Flotation cell (flotation of sulfide ore) Φ3.5x4.0 m
Flotation cell (flotation of oxide ore) Φ4.0x4.5 m
Flotation machine XCF-30
Flotation machine KYF-30
Flotation machine XCF-8
Flotation machine KYF-8
Slurry pump (sulfide ore flotation concentrate) 80/65
Slurry pump (oxide ore flotation concentrate) 50/40
Slurry pump (tailings) 250/200
Pipe sampler (copper-cobalt sulfide concentrate) DN200
Pipe sampler (copper cobalt oxide concentrate) DN200
Pipe sampler (flotation tailings) DN350
Blower 450 m3, 50 kPa
Submerged pump (accident pool) 65 (exit)
Submerged pump (in a tailings pit) 65 (exit)
Liquid level of a sulfide ore cleaning tailings pump pool 0 - 1.5 m
Liquid level of a sulfide ore flotation concentrate pump pool 0 - 1.5 m
Liquid level of an oxide ore flotation concentrate pump pool 0 - 1.5 m
Liquid level of a flotation tailings pump pool 0 - 2.5 m
Blower outlet wind pressure 0 - 0.05 MPa
[0068] Production indexes are summarized in the table below.
Raw Ore The amount of ore selected Tons 86855
Grade of the ore selected
Wherein Cu % 1.50%
Co % 0.61%
The amount of metal in the ore selected
Wherein Cu Tons 1306.44
Co Tons 528.56
Concentrate The amount of concentrate Tons 5635
Concentrate grade
Wherein Cu % 21.15%
Co % 7.43%
The amount of metal in concentrate
Wherein Cu Tons 1191.86
Co Tons 418.79
Concentrate yield % 6.49%
Recovery rate
Wherein Cu % 91.23%
Co % 79.23%
Tailings The amount of tailings Tons 81220
Tailings grade
Wherein Cu % 0.141%
Co % 0.135%
The amount of metal in tailings
Wherein Cu Tons 114.58
Co Tons 109.77
[0069] Judging from the production results, this method allows efficient separation of copper-cobalt sulfide ore.
[0070] Finally, using this method, a copper-cobalt sulfide concentrate with a Cu grade of 23% and a Co grade of 8% can be produced from a copper-cobalt sulfide raw ore with a Cu grade of 1.5% and a Co grade of 0.5%. The copper recovery rate is over 90%, and the cobalt recovery rate is over 80%. In addition, through the optimization of the reagent system, the reformed process allows mixed separation of copper-cobalt sulfide ores and copper-cobalt oxide ores; thus, oxide ore can also be treated.
[0071] Adapting the process described in Fig. 3, processing capacity reaches 3000 t/d; a copper-cobalt sulfide concentrate with a Cu grade of 23% and a Co grade of 8% can be produced from a copper-cobalt sulfide raw ore with a Cu grade of 1.5% and a Co grade of 0.5%. The copper recovery rate is over 90%, and the cobalt recovery rate is over 80%.

Claims (9)

WHAT IS CLAIMED IS:
1) step I: coarse grinding pouring ore transported by a vehicle directly through a raw ore grid screen into an ore storehouse, feeding the ore into a jaw crusher through a heavy plate feeder; transferring a coarse grinding product to an intermediate ore pile through a belt conveyor;
1. A two-zoned flotation method for copper-cobalt sulfide ore in industrial production, characterized in that it comprises the following steps:
2. The method according to claim 1, characterized in that the reagent for zone I roughing I is added to a 1//mixing bucket, and includes 600 g/t of lime as a pH adjuster to keep the pH of slurry within 9.5 - 10.0, 150 g/t of sodium humate as an inhibitor, 70 g/t of 2# oil as a frothing agent, and 60 g/t of butyl xanthate as a collector.
2) step II: intermediate ore pile stacking providing an intermediate ore pile to act as an ore-supplying buffer for a separation process to ensure ore supply during maintenance shutdown of grinding; this is due to an operating system for coarse grinding being different from that for separation;
3. The method according to claim 1, characterized in that the reagent for zone I roughing II added includes 70 g/t of sodium humate as an inhibitor, 24 g/t of 2# oil as a frothing agent, and 35 g/t of butyl xanthate as a collector.
3) step III: grinding transporting ore from an intermediate ore pile to a semi-autogenous grinding mill by a belt for grinding; transferring a sieved material to a hydrocyclone by a slurry pump for classification after the sieved material enters a grinding sump; transferring sediment to a ball mill for grinding; transferring a product of ball milling to a hydrocyclone by a slurry pump for classification after the product of ball milling enters a grinding sump; sending an overflow product for flotation, transferring sediment to a ball mill for grinding;
4. The method according to claim 1, characterized in that only 25 g/t of butyl xanthate as a collector is added in the scavenging operation of zone I.
4) step IV: flotation adopting a zoned flotation process that is divided into two zones: zone I is mainly for controlling a concentrate index, zone II is for controlling recovery rate, zone I and zone II respectively comprises a mixing bucket, namely al# mixing bucket and a 2# mixing bucket, each zone respectively produces a concentrate product, namely concentrate 1 and concentrate 2;
adopting a “two roughing, one scavenging, and three cleanings” process for a flotation operation in zone I:
adding a reagent for zone I roughing I to a 1# mixing bucket; introducing an overflow slurry of a hydrocyclone to a roughing I flotation cell after the overflow slurry enters al# mixing bucket and is thoroughly mixed, the 1# mixing bucket is a starting point of zone 1; introducing slurry of a roughing I operation to a roughing II operation; introducing slurry of a roughing II operation to a scavenging operation; introducing froths of a roughing I operation and a roughing II operation to a cleaning operation area in zone 1; allowing froth from a scavenging operation to return to a roughing II operation and slurry to go to a starting position of zone II, which is a 2# mixing bucket; cleaning zone I involves three cleaning processes: introducing froth of a cleaning I operation to a cleaning II operation, allowing slurry to return to a roughing I operation, introducing froth of a cleaning II operation to a cleaning III operation, adding no reagent in a cleaning III operation, allowing slurries from a cleaning II operation and a cleaning III operation to return to cleaning I and cleaning II separately and sequentially; froth of a cleaning III operation is concentrate I product;
adopting a “one roughing, two scavengings, and three cleanings” process for a flotation operation in zone II:
adding a reagent for zone II roughing to a 2# mixing bucket; introducing slurry to a roughing I flotation cell after the slurry is thoroughly mixed; introducing slurry of a roughing operation to a scavenging I operation; introducing slurry to a zone II cleaning operation area, introducing slurry of a scavenging I operation to a scavenging II operation, allowing froth to return to a roughing operation, adding no flotation reagent in a scavenging II operation, introducing slurry of scavenging II to a tailings pond, transporting the slurry of scavenging II to a tailings thickener by a slurry pump; a cleaning operation in zone II is divided into three cleaning processes, introducing froth from cleaning I to cleaning II, allowing slurry to return to a roughing operation, introducing froth of a cleaning II operation to cleaning III; allowing slurries of a cleaning II operation and a cleaning III operation to return to cleaning I and cleaning II separately and sequentially; froth of cleaning III is concentrate II product.
5. The method according to claim 1, characterized in that only 40 g/t of sodium humate as an inhibitor is added in the cleaning I operation of zone I.
6. The method according to claim 1, characterized in that only 20 g/t of sodium humate as an inhibitor is added in the cleaning II operation of zone I.
7. The method according to claim 1, characterized in that the reagent for zone II roughing I includes butyl xanthate as a collector and sodium humate as an inhibitor in an amount of 20 g/t and 30 g/t respectively.
8. The method according to claim 1, characterized in that only 10 g/t of butyl xanthate as a collector is added to the scavenging I operation of zone II.
9. The method as claimed in claim 1, characterized in that in cleaning I and cleaning II of zone II, only sodium humate as an inhibitor is added in an amount of 15 g/t and 10 g/t respectively.
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