CN105797848A - Intensified gold leaching method including strong magnetic separation and pre-removal of fine silt in gold-iron oxidized ore - Google Patents
Intensified gold leaching method including strong magnetic separation and pre-removal of fine silt in gold-iron oxidized ore Download PDFInfo
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- CN105797848A CN105797848A CN201610158338.9A CN201610158338A CN105797848A CN 105797848 A CN105797848 A CN 105797848A CN 201610158338 A CN201610158338 A CN 201610158338A CN 105797848 A CN105797848 A CN 105797848A
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 239000010931 gold Substances 0.000 title claims abstract description 74
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 69
- 238000007885 magnetic separation Methods 0.000 title claims abstract description 65
- 238000002386 leaching Methods 0.000 title claims abstract description 64
- NPEWZDADCAZMNF-UHFFFAOYSA-N gold iron Chemical compound [Fe].[Au] NPEWZDADCAZMNF-UHFFFAOYSA-N 0.000 title abstract 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 78
- 239000011707 mineral Substances 0.000 claims abstract description 78
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 59
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 58
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000012141 concentrate Substances 0.000 claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 claims abstract description 25
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 238000005516 engineering process Methods 0.000 claims abstract description 15
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims description 28
- MNWBNISUBARLIT-UHFFFAOYSA-N sodium cyanide Chemical compound [Na+].N#[C-] MNWBNISUBARLIT-UHFFFAOYSA-N 0.000 claims description 17
- 238000000605 extraction Methods 0.000 claims description 14
- 239000002002 slurry Substances 0.000 claims description 14
- 238000005728 strengthening Methods 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 10
- 238000001179 sorption measurement Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 6
- 230000002950 deficient Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000005389 magnetism Effects 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 11
- 229910052709 silver Inorganic materials 0.000 description 9
- 239000004332 silver Substances 0.000 description 9
- 238000001914 filtration Methods 0.000 description 8
- 239000003610 charcoal Substances 0.000 description 7
- 230000004044 response Effects 0.000 description 6
- KZNMRPQBBZBTSW-UHFFFAOYSA-N [Au]=O Chemical compound [Au]=O KZNMRPQBBZBTSW-UHFFFAOYSA-N 0.000 description 5
- 229910001922 gold oxide Inorganic materials 0.000 description 5
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910001608 iron mineral Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000001272 nitrous oxide Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229960000633 dextran sulfate Drugs 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- PQTCMBYFWMFIGM-UHFFFAOYSA-N gold silver Chemical compound [Ag].[Au] PQTCMBYFWMFIGM-UHFFFAOYSA-N 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001180 sulfating effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/08—Obtaining noble metals by cyaniding
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method of an intensified gold leaching technology including strong magnetic separation and pre-removal of fine silt in gold-iron oxidized ore. The method comprises the following steps: carrying out low-intensity magnetic separation on feed ore to enrich carrier mineral magnetite so as to obtain strongly magnetic mineral and low-intensity magnetic separation tailings, carrying out strong magnetic separation ore dressing on the obtained low-intensity magnetic separation tailings so as to obtain weakly magnetic mineral and non-magnetic mineral; removing the non-magnetic mineral; then respectively carrying out cyanide leaching treatment on the strongly magnetic mineral and the weakly magnetic mineral so as to respectively obtain magnetite concentrate, iron ore concentrate and gold bearing carbon. According to the invention, scientific grouping is creatively carried out on carrier minerals of gold according to different magnetism of different carrier minerals of gold, and after grouping, specific cyanide leaching treatment is carried out, and thus effectively improving the gold leaching efficiency and the gold recovery rate of cyanide leaching treatment; and the method is a beneficiation method which is remarkable in effect, low in production cost and capable of greatly improve the gold leaching efficiency, and is especially applicable to recovery of gold and iron of gold-iron oxidized ore with relatively high silt content.
Description
Technical field
The present invention relates to the beneficiation method of the ferrum gold oxide ore high containing thin mud amount, throw in advance except gold method is soaked in the strengthening of mud thin in aufe oxide ore more particularly, to a kind of high intensity magnetic separation that includes.
Background technology
Gold is exactly a kind of very important noble metal since ancient times.The physics good due to it and chemical property, be widely used in the industries such as processing of ornament, finance deposit, Aero-Space and modern communication.
But, along with the increasing of gold mining amount, current free-milling ore is fewer and feweri, this area faced by difficulty
Ore dressing stone gets more and more, and the Gold Ore of the method efficient recovery that can pass through gravity-floatation is also fewer and feweri.
Existing research provides the extraction of gold process of Refractory Au-ores, such as, publication number is the extraction of gold process that the Chinese patent application of CN201010581979 discloses a kind of Refractory Au-ores, adopt sulfating roasting-slag secondary low temperature acid roasting-middle temperature sulfuric acid acidation decomposition-cyanidation gold-extracted working continuously, the slag utilizing conventional dextran sulfate roasting carries out secondary low temperature acid roasting oxidation, carry out medium temperature roast afterwards and decompose sulfate, it is then passed through fine grinding and carries out Cyanide Leaching again, making the indissoluble gold being wrapped in carbon, arsenic, sulfur by high efficiente callback, the shortcoming of this technical scheme is
The acidizing fired acidifying warm with in low temperature is decomposed, it is not easy to operation, flow process is complex, is unfavorable for industrial popularization；The Chinese patent application that publication number is CN02114574 discloses a kind of activaled prussiate gold leaching-out process, the activaled prussiate gold leaching-out process that the method uses is to make gold change in mineral internal structure and activate under the effect of activator, then cyaniding is adopted to extract gold, the core of this technical scheme is the mechanism of catalytic reaction utilizing nitrous oxide with metal, it is elemental oxygen and gold reaction, gold is made to react with cyanide after departing from lattice, but owing to the lasting nitrous oxide that passes into industrially is not easy to realize, therefore this technical scheme has obvious limitation in actual production, the response rate of gold also there is no obvious raising；The Chinese patent application that publication number is CN200810050526 discloses a kind of composite mineral-leaching bacteria colony and applies at biological metallurgy, point out to have carried out the leaching gold experimental study of this kind of composite mineral-leaching bacteria colony in the temperature range of 35 DEG C～52 DEG C, due to flora for factors such as the restriction of temperature conditions and leaching cycle length, therefore this technical scheme is currently also unfavorable for the popularization of industry.
Additionally, research Gold Ore sorted also by floatation, but owing to the grade of Gold Ore can not be brought up to a higher rank by floatation, therefore the later stage needs for the process through Cyanide Leaching.
The method that the most cost-effective method remains Cyanide Leaching, but prior art is difficult to ensure that the response rate of Results of Gold in Auriferous Ore Samples.Therefore, in order to improve the response rate and the efficiency of leaching of gold, need badly sum up one more effectively, more reasonably leaching-out technique scheme.
Summary of the invention
The deficiencies such as the response rate that it is an object of the invention to exist in the beneficiation method of the ferrum gold oxide ore high for existing clay content is low, production cost is high, grade is on the low side, it is provided that a kind of high intensity magnetic separation that includes throws the method strengthening technology for gold extraction except mud thin in aufe oxide ore in advance.
The purpose of the present invention is achieved by the following technical programs:
The invention provides a kind of high intensity magnetic separation that includes and throw the method strengthening technology for gold extraction except mud thin in aufe oxide ore in advance, it is will first pass through low intensity magnetic separation enrichment carrier mineral magnetic iron ore to ore deposit, obtain strongly magnetic mineral and low intensity magnetic separation mine tailing, gained low intensity magnetic separation mine tailing is carried out high intensity magnetic separation ore dressing, obtains weak magnetic mineral and non magnetic ore；Throw unless magnetic mineral；Then carry out Cyanide Leaching process respectively for strongly magnetic mineral and weak magnetic mineral, respectively obtain magnetite concentrate, brown iron ore concentrate and gold loaded carbon.What the present invention adopted is first pass through low intensity magnetic separation enrichment carrier mineral magnetic iron ore, then Cyanide Leaching targetedly；Again through the carrier mineral limonite of high intensity magnetic separation Concentration of Gold, then Cyanide Leaching targetedly.Further, thrown the thin mud in deironing Gold Ore by high intensity magnetic separation in advance, and avoid the absorption for the gold of cyaniding dissolution of the thin mud.
Preferably, described is through corase grind, classification to ore deposit, is enter low intensity magnetic separation after-0.074mm accounts for the mineral aggregate of 60～80% by grinding particle size；Preferably by grinding particle size be-0.074mm account for 70% mineral aggregate enter low intensity magnetic separation.
Preferably, the magnetic field intensity of described low intensity magnetic separation is 0.15T～0.25T.
Preferably, for strongly magnetic mineral carry out the method for Cyanide Leaching process be by concentrated for described strongly magnetic mineral size mixing to 20%～30% pulp density, and to adjust slurry pH be 11, add Cyanogran. and carry out Cyanide Leaching, obtain leachate 1, by leachate 1 activated carbon adsorption, obtain magnetite concentrate and gold loaded carbon.Preferably, the pulp density sized mixing to 25% is concentrated.
Preferably, the magnetic field intensity of described high intensity magnetic separation is 0.5T～1T.
Preferably, for weak magnetic mineral carry out the method for Cyanide Leaching process be by concentrated for described weak magnetic mineral size mixing to 35%～40% pulp density, and to adjust slurry pH be 11, add Cyanogran. and carry out Cyanide Leaching, obtain leachate 2, by leachate 2 activated carbon adsorption, obtain brown iron ore concentrate and gold loaded carbon.Preferably, the pulp density sized mixing to 35% is concentrated.
Preferably, by after described strongly magnetic mineral or weak magnetic mineral classification respectively-0.043mm accounts for the mineral aggregate of 80～90% and carries out Cyanide Leaching again, it is preferable that account for 80～85%.It is further preferred that by after described strongly magnetic mineral or weak magnetic mineral classification respectively-0.043mm accounts for the mineral aggregate of 81% and carries out Cyanide Leaching again, under this ratio, not only obtain preferably leaching effect, and the ore grinding cost produced be more reasonable.
Preferably, described adjustment slurry pH is 11 is adopt one or more the mixture in Calx sodium hydroxide or sodium carbonate to be adjusted；The amount adding Cyanogran. is that 2000～2500g/t is to ore deposit.
Specifically, the inventive method comprises the following steps:
S1. by raw ore (to ore deposit) through corase grind, classification, it is-0.074mm mineral aggregate entrance the low intensity magnetic separation accounting for 70% by grinding particle size, obtains strongly magnetic mineral and low intensity magnetic separation mine tailing；
S2. by concentrated for the step S1 gained strongly magnetic mineral pulp density to 20%～30% (mass percent), and to adjust slurry pH be 11, after classification ,-0.043mm accounts for the direct Cyanide Leaching of mineral aggregate of 80～85% (as far as possible integers), obtain leachate 1, by leachate 1 activated carbon adsorption, obtain magnetite concentrate and gold loaded carbon；Preferably, after classification ,-0.043mm accounts for the direct Cyanide Leaching of mineral aggregate of 81%.
Step S1 gained low intensity magnetic separation mine tailing being carried out high intensity magnetic separation ore dressing under the magnetic field intensity of 0.5T～1T, obtains weak magnetic mineral and non magnetic ore, gained non magnetic ore is directly abandoned as thin mud mine tailing and is not involved in leaching process；Slurry pH, through concentrating the pulp density sized mixing to 35%～40%, is adjusted to 11, then carries out Cyanide Leaching, obtain leachate 2, by leachate 2 activated carbon adsorption, obtain brown iron ore concentrate and gold loaded carbon by the weak magnetic mineral of high intensity magnetic separation gained.
Waste liquid after absorption obtains broken charcoal, backwater and magnetite concentrate accordingly after crossing safe screen, concentration, filtration.
Wherein, low intensity magnetic separation described in step S1 is to carry out under the field intensity of 0.15T～0.25T；Cyclone overflow can be adopted to carry out low intensity magnetic separation.
Classification described in step S1 can adopt cyclone classification or spiral classifier classification.
Weakly magnetic tailings described in step S2 carries out high intensity magnetic separation ore dressing under the magnetic field intensity of 0.5T～1T, obtains weak magnetic mineral and non magnetic ore.
Preferably, granularity described in step S2 accounts for 81% for-0.043mm.
Preferably, slurry pH being adjusted described in step S2 to 11 is add Calx to be adjusted.
Preferably, the Cyanide Leaching of Cyanide Leaching described in step S2 processes, and Cyanogran. addition is that 2000～2500g/t is to ore deposit (once adding).
Preferably, the defective grade material after step S2 classification can carry out again ore grinding then classification, and-0.043mm accounts for the mineral aggregate of 80～85% can carry out Cyanide Leaching process.
Beneficial effects of the present invention is as follows:
Golden carrier mineral is creatively grouped by the present invention for the magnetic difference of the different carriers mineral of gold, and carrying out Cyanide Leaching targetedly after packet again processes, and is effectively increased Gold leaching efficiency and the golden response rate that Cyanide Leaching processes；The present invention throws except the mineral such as thin mud and the stone-like pulse that do not have magnetic in advance by the high intensity magnetic separation under reasonable field intensity, owing to non magnetic ore iron-holder is only 13%, and be not gold silver Supported Iron mineral, therefore, adopt and directly throw the method removed to remove the thin mud of this part, thus reducing its adsorption to gold solubilized in the Cyanide Leaching in later stage.Devise to scientific system of the present invention include throwing in advance except and the overall technology that processes of specific aim Cyanide Leaching process step, while improving the response rate of Gold leaching efficiency and gold, more efficiently synthetical recovery iron mineral.Effect of the present invention is obvious, production cost is low, can improve the beneficiation method of leaching gold efficiency significantly, is particularly suited for the recovery of the bigger aufe oxide ore aufe of clay content.
Adopting the inventive method, gold overall recovery is more than 91%, may be up to 93.5%, and silver overall recovery is more than 36.91%, may be up to 39.25%；Ferrum overall recovery is more than 50.25%, may be up to 52.26%；Iron extract mine producation compares the taste of gold in raw ore with the grade of gold in mine tailing, can decline 93.18%～94.21%；Iron ore concentrate compares the taste of silver in raw ore with the grade of silver in mine tailing, can decline 35.06%～40.66%.
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention.
Detailed description of the invention
The present invention is further illustrated below in conjunction with specific embodiment.Ore source the being merely cited for property explanation that following embodiment illustrates, it is impossible to be interpreted as limitation of the present invention.Unless stated otherwise, the raw material used in following embodiment is the raw material that this area conventional market channel obtains, and unless stated otherwise, the method and apparatus used in following embodiment is method and apparatus commonly used in the art.
Process chart in the embodiment of the present invention is as shown in Figure 1.
Embodiment 1
The present embodiment is Yunnan ferrum gold oxide ore to ore deposit, adopts the method for following steps to carry out the Strengthen education of gold:
S1. by raw ore after ball mill corase grind and cyclone classification, wherein-0.074mm grade accounts for 70%, adopt FX75 cyclone to carry out graded operation, carry out carrying out low intensity magnetic separation under the field intensity that magnetic field intensity is 0.35T after cyclone overflow slagging-off, obtain strongly magnetic mineral and low intensity magnetic separation mine tailing；
S2. the strongly magnetic mineral that step S1 obtains concentrates again, and the backwater of concentration returns mill ore magnetic selection operation, and the ore pulp after concentration carries out classification so that in ore pulp ,-0.043mm grade accounts for 81%, and the granule of defective grade enters ball mill and regrinds.It is 11 the overflow of cyclone adds Calx adjustment slurry pH, pulp density is 25%, add Cyanogran., Cyanogran. consumption is that 2000 g ton are to ore deposit (once adding), carry out cyanidation-leaching process, obtaining leachate 1, leachate 1 carries out absorption with activated carbon (concentration of activated carbon that the present embodiment adopts is 16g/L) and obtains gold loaded carbon, and ore pulp then obtains magnetite concentrate and broken charcoal after safe screen, concentration, filtration.Backwater returns Cyanide Leaching operation of regrinding.
The mine tailing of gained low intensity magnetic separation, enters high intensity magnetic separation operation, magnetic field intensity is adjusted to 0.9T, obtains weak magnetic mineral and non magnetic ore.Non magnetic ore is directly entered Tailings Dam.Weak magnetic mineral then through concentration size mixing to pulp density be 35%, adding Calx adjustment pH value is 11, Cyanogran. consumption is that 2000 g ton are to ore deposit (once adding), carry out Cyanide Leaching operation, obtain leachate 2, leachate 2 is by obtaining gold loaded carbon after activated carbon (concentration of activated carbon that the present embodiment adopts is 16g/L) absorption, and the leachate after absorption obtains brown iron ore concentrate and broken charcoal after safe screen, thickening filtration.Backwater returns Cyanide Leaching operation.
Waste liquid after filtration can re-start concentration.
The process conditions that Cyanide Leaching described in the present embodiment processes can refer to existing routine techniques, and as preferably, the Cyanide Leaching of described Cyanide Leaching processes, Cyanogran. addition be 2000g/t to ore deposit, stirring intensity is 1400 revs/min, and the time of Cyanide Leaching is 36h.
It is 93.09% that the present embodiment obtains gold overall recovery, and silver overall recovery is 36.91%, and ferrum overall recovery is the index of 51.30%.Wherein in iron extract mine producation, the grade of gold is also dropped to 0.14g/t by 2.07g/t, have dropped 93.24%；In iron ore concentrate, the grade of silver is also dropped to the 24.55g/t in iron ore concentrate and mine tailing by the 38.92g/t in raw ore, have dropped 36.92%.
Embodiment 2
The present embodiment is Sichuan ferrum gold oxide ore to ore deposit, adopts the method for following steps to carry out the Strengthen education of gold:
S1., by raw ore after ball mill corase grind and spiral classifier classification, wherein-0.074mm grade accounts for 75%；Adopt spiral classifier to carry out graded operation, carry out carrying out low intensity magnetic separation under the field intensity that magnetic field intensity is 0.3T after classifier overflow slagging-off, obtain strongly magnetic mineral and low intensity magnetic separation mine tailing；
S2. the strongly magnetic mineral that step S1 obtains concentrates again, and the backwater of concentration returns mill ore magnetic selection operation, and the ore pulp after concentration carries out classification so that in ore pulp ,-0.043mm grade accounts for 85%, and the granule of defective grade enters ball mill and regrinds.It is 11 the overflow of cyclone adds Calx adjustment slurry pH, pulp density is 30%, add Cyanogran., Cyanogran. consumption is that 2000 g ton are to ore deposit (once adding), carry out cyanidation-leaching process, obtaining leachate 1, leachate 1 carries out absorption with activated carbon (concentration of activated carbon that the present embodiment adopts is 16g/L) and obtains gold loaded carbon, and ore pulp then obtains magnetite concentrate and broken charcoal after safe screen, concentration, filtration.Backwater returns Cyanide Leaching operation of regrinding.
The mine tailing of gained low intensity magnetic separation, enters high intensity magnetic separation operation, magnetic field intensity is adjusted to 0.8T, obtains weak magnetic mineral and non magnetic ore.Non magnetic ore is directly entered Tailings Dam.Weak magnetic mineral then through concentration size mixing to pulp density be 40%, adding Calx adjustment pH value is 11, Cyanogran. consumption is that 2000 g ton are to ore deposit (once adding), the leachate 2 obtained is by obtaining gold loaded carbon after activated carbon (concentration of activated carbon that the present embodiment adopts is 16g/L) absorption, and the leachate after absorption obtains brown iron ore concentrate and broken charcoal after safe screen, thickening filtration.Backwater returns Cyanide Leaching operation.
Other conditions are with reference to embodiment 1.
It is 91.50% that the present embodiment obtains gold overall recovery, and silver overall recovery is 38.25%, and ferrum overall recovery is the index of 52.26%.Wherein in iron extract mine producation and mine tailing, the grade of gold is also dropped to 0.15g/t by the 2.20g/t in raw ore, have dropped 93.18%；；In iron ore concentrate, the grade of silver is also dropped to the 26.32g/t in iron ore concentrate and mine tailing by the 40.53g/t in raw ore, have dropped 35.06%.
Embodiment 3
The present embodiment is Guangxi ferrum gold oxide ore to ore deposit, adopts the method for following steps to carry out the Strengthen education of gold:
S1. will to ore deposit after ball mill corase grind and spiral classifier classification, wherein-0.074mm grade accounts for 80%, adopt spiral classifier to carry out graded operation, carry out carrying out low intensity magnetic separation under the field intensity that magnetic field intensity is 0.25T after classifier overflow slagging-off, obtain strongly magnetic mineral and low intensity magnetic separation mine tailing；
S2. the strongly magnetic mineral that step S1 obtains concentrates, and the backwater of concentration returns mill ore magnetic selection operation, and the ore pulp after concentration carries out classification so that in ore pulp ,-0.043mm grade accounts for 85%, and the granule of defective grade enters ball mill and regrinds.It is 11 by the overflow of cyclone adds Calx adjustment slurry pH, pulp density is 23%, add Cyanogran., Cyanogran. consumption is that 2500 g ton are to ore deposit (once adding), carry out cyanidation-leaching process, obtaining leachate 1, leachate 1 carries out absorption with activated carbon (concentration of activated carbon that the present embodiment adopts is 16g/L) and obtains gold loaded carbon, and ore pulp then obtains magnetite concentrate and broken charcoal after safe screen, concentration, filtration.Backwater returns Cyanide Leaching operation of regrinding.
The mine tailing of gained low intensity magnetic separation, enters high intensity magnetic separation operation, magnetic field intensity is adjusted to 0.8T, obtains weak magnetic mineral and non magnetic ore.Non magnetic ore is directly entered Tailings Dam.Weak magnetic mineral through concentration size mixing to pulp density be 30%, carrying out classification makes-0.043mm grade in ore pulp account for 85%, adding Calx adjustment pH value is 11, adding Calx adjustment pH value is 11, Cyanogran. consumption is that 2500 g ton are to ore deposit (once adding), the leachate 2 obtained is by obtaining gold loaded carbon after activated carbon (concentration of activated carbon that the present embodiment adopts is 16g/L) absorption, and the leachate after absorption obtains brown iron ore concentrate and broken charcoal after safe screen, thickening filtration.Backwater returns Cyanide Leaching operation.
Other treatment conditions are with embodiment 1.
It is 93.50% that the present embodiment obtains gold overall recovery, and silver overall recovery is 39.25%, and ferrum overall recovery is the index of 50.25%.Wherein in iron extract mine producation and mine tailing, the grade of gold is also dropped to 0.11g/t by the 1.90g/t in raw ore, have dropped 94.21%；In iron ore concentrate, the grade of silver is also dropped to the 21.58g/t in iron ore concentrate and mine tailing by the 36.37g/t in raw ore, have dropped 40.66%.
Claims (10)
1. one kind includes the method that high intensity magnetic separation throws the strengthening technology for gold extraction except mud thin in aufe oxide ore in advance, it is characterized in that, it is will first pass through low intensity magnetic separation enrichment carrier mineral magnetic iron ore to ore deposit, obtain strongly magnetic mineral and low intensity magnetic separation mine tailing, gained low intensity magnetic separation mine tailing is carried out high intensity magnetic separation ore dressing, obtains weak magnetic mineral and non magnetic ore；Throw unless magnetic mineral；Then carry out Cyanide Leaching process respectively for strongly magnetic mineral and weak magnetic mineral, respectively obtain magnetite concentrate, brown iron ore concentrate and gold loaded carbon.
2. include the method that high intensity magnetic separation throws the strengthening technology for gold extraction except mud thin in aufe oxide ore in advance according to claim 1, it is characterised in that described is that grinding particle size is the-0.074mm mineral aggregate entrance low intensity magnetic separation accounting for 60～80% through corase grind, classification to ore deposit；It is preferably enter low intensity magnetic separation after-0.074mm accounts for the mineral aggregate of 70% by grinding particle size.
3. the high intensity magnetic separation that includes according to claim 1 or claim 2 throws the method strengthening technology for gold extraction except mud thin in aufe oxide ore in advance, it is characterised in that the magnetic field intensity of described low intensity magnetic separation is 0.15T～0.25T.
4. include the method that high intensity magnetic separation throws the strengthening technology for gold extraction except mud thin in aufe oxide ore in advance according to claim 1, it is characterized in that, for strongly magnetic mineral carry out the method for Cyanide Leaching process be by concentrated for described strongly magnetic mineral size mixing to 20%～30% pulp density, and to adjust slurry pH be 11, add Cyanogran. and carry out Cyanide Leaching, obtain leachate 1, by leachate 1 activated carbon adsorption, obtain magnetite concentrate and gold loaded carbon.
5. include the method that high intensity magnetic separation throws the strengthening technology for gold extraction except mud thin in aufe oxide ore in advance according to claim 1, it is characterised in that the magnetic field intensity of described high intensity magnetic separation is 0.5T～1T.
6. include the method that high intensity magnetic separation throws the strengthening technology for gold extraction except mud thin in aufe oxide ore in advance according to claim 1, it is characterized in that, for weak magnetic mineral carry out the method for Cyanide Leaching process be by concentrated for described weak magnetic mineral size mixing to 35%～40% pulp density, and to adjust slurry pH be 11, add Cyanogran. and carry out Cyanide Leaching, obtain leachate 2, by leachate 2 activated carbon adsorption, obtain brown iron ore concentrate and gold loaded carbon.
7. according to claim 4 or 6, include the method that high intensity magnetic separation throws the strengthening technology for gold extraction except mud thin in aufe oxide ore in advance, it is characterized in that, by after described strongly magnetic mineral or weak magnetic mineral classification respectively-0.043mm accounts for the mineral aggregate of 80～85% and carries out Cyanide Leaching again；Preferably by after described strongly magnetic mineral or weak magnetic mineral classification respectively-0.043mm accounts for the mineral aggregate of 81% and carries out Cyanide Leaching again.
8. according to claim 4 or 6, include the method that high intensity magnetic separation throws the strengthening technology for gold extraction except mud thin in aufe oxide ore in advance, it is characterised in that described adjustment slurry pH is that 11 employing Calx are adjusted；The amount adding Cyanogran. is that 2000～2500g/t is to ore deposit.
9. according to any one of claim 1 to 8, include the method that high intensity magnetic separation throws the strengthening technology for gold extraction except mud thin in aufe oxide ore in advance, it is characterised in that comprise the following steps:
S1. by raw ore through corase grind, classification, it is-0.074mm mineral aggregate entrance the low intensity magnetic separation accounting for 70% by grinding particle size, obtains strongly magnetic mineral and low intensity magnetic separation mine tailing；
S2. by concentrated for step S1 gained strongly magnetic mineral to 20%～30% pulp density, then through making-0.043mm account for 80～85% after staged care, adjust slurry pH be 11, direct Cyanide Leaching, obtain leachate 1, by leachate 1 activated carbon adsorption, obtain magnetite concentrate and gold loaded carbon；
Step S1 gained low intensity magnetic separation mine tailing being carried out high intensity magnetic separation ore dressing under the magnetic field intensity of 0.5T～1T, obtains weak magnetic mineral and non magnetic ore, gained non magnetic ore is directly abandoned as thin mud mine tailing and is not involved in leaching process；The weak magnetic mineral of high intensity magnetic separation gained is concentrated size mixing to 35～40% pulp density, then through making-0.043mm account for 80～85% after staged care, slurry pH is adjusted to 11, then Cyanide Leaching is carried out, obtain leachate 2, by leachate 2 activated carbon adsorption, obtain brown iron ore concentrate and gold loaded carbon.
10. include the method that high intensity magnetic separation throws the strengthening technology for gold extraction except mud thin in aufe oxide ore in advance according to claim 9, it is characterized in that, also including the defective grade material after by step S2 classification and carry out again ore grinding then staged care ,-0.043mm accounts for the mineral aggregate of 80～85% and carries out the step of Cyanide Leaching process.
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| CN115254398A (en) * | 2022-09-01 | 2022-11-01 | 山东黄金矿业科技有限公司选冶实验室分公司 | Method for pre-selecting and discarding gold ores and reducing excessive grinding |
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| CN115254398B (en) * | 2022-09-01 | 2024-06-07 | 山东黄金矿业科技有限公司选冶实验室分公司 | Method for pre-dressing waste disposal and overgrinding reduction of gold ore |
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