WO2010050462A1 - 高砒素品位含銅物からの砒素鉱物の分離方法 - Google Patents
高砒素品位含銅物からの砒素鉱物の分離方法 Download PDFInfo
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- WO2010050462A1 WO2010050462A1 PCT/JP2009/068391 JP2009068391W WO2010050462A1 WO 2010050462 A1 WO2010050462 A1 WO 2010050462A1 JP 2009068391 W JP2009068391 W JP 2009068391W WO 2010050462 A1 WO2010050462 A1 WO 2010050462A1
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- Prior art keywords
- copper
- arsenic
- flotation
- concentrate
- slurry
- Prior art date
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- 239000010949 copper Substances 0.000 title claims abstract description 172
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 171
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 170
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 158
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 155
- 238000000034 method Methods 0.000 title claims abstract description 52
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 41
- 239000011707 mineral Substances 0.000 title claims abstract description 41
- 239000000126 substance Substances 0.000 title abstract description 12
- 238000005188 flotation Methods 0.000 claims abstract description 51
- 239000002002 slurry Substances 0.000 claims abstract description 40
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims abstract description 30
- 235000019345 sodium thiosulphate Nutrition 0.000 claims abstract description 30
- 239000003112 inhibitor Substances 0.000 claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 150000004686 pentahydrates Chemical class 0.000 claims abstract description 8
- GTKRFUAGOKINCA-UHFFFAOYSA-M chlorosilver;silver Chemical compound [Ag].[Ag]Cl GTKRFUAGOKINCA-UHFFFAOYSA-M 0.000 claims abstract description 6
- 239000008396 flotation agent Substances 0.000 claims abstract description 5
- 239000012141 concentrate Substances 0.000 claims description 116
- 238000000926 separation method Methods 0.000 claims description 38
- 239000000463 material Substances 0.000 claims description 31
- 230000033116 oxidation-reduction process Effects 0.000 claims description 18
- 239000004088 foaming agent Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 3
- 230000005587 bubbling Effects 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 13
- 238000003723 Smelting Methods 0.000 description 10
- 239000002893 slag Substances 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 238000007667 floating Methods 0.000 description 6
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 description 5
- 229910052951 chalcopyrite Inorganic materials 0.000 description 5
- 229910001779 copper mineral Inorganic materials 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 4
- 229910052683 pyrite Inorganic materials 0.000 description 4
- 239000011028 pyrite Substances 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- AWDBHOZBRXWRKS-UHFFFAOYSA-N tetrapotassium;iron(6+);hexacyanide Chemical compound [K+].[K+].[K+].[K+].[Fe+6].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] AWDBHOZBRXWRKS-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- AQLMHYSWFMLWBS-UHFFFAOYSA-N arsenite(1-) Chemical compound O[As](O)[O-] AQLMHYSWFMLWBS-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 150000001495 arsenic compounds Chemical class 0.000 description 2
- JEMGLEPMXOIVNS-UHFFFAOYSA-N arsenic copper Chemical compound [Cu].[As] JEMGLEPMXOIVNS-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229940093920 gynecological arsenic compound Drugs 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000033 sodium borohydride Inorganic materials 0.000 description 2
- 239000012279 sodium borohydride Substances 0.000 description 2
- 235000012247 sodium ferrocyanide Nutrition 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- -1 bisulfite ions Chemical class 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical compound [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 150000004682 monohydrates Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- 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
- C22B15/00—Obtaining copper
- C22B15/0002—Preliminary treatment
- C22B15/0004—Preliminary treatment without modification of the copper constituent
- C22B15/0008—Preliminary treatment without modification of the copper constituent by wet processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/002—Inorganic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/01—Organic compounds containing nitrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/012—Organic compounds containing sulfur
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
-
- 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
- C22B30/00—Obtaining antimony, arsenic or bismuth
- C22B30/04—Obtaining arsenic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/06—Depressants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
Definitions
- the present invention relates to a beneficiation method for obtaining a low-arsenic grade copper concentrate by separating an arsenic mineral from a copper-containing material containing arsenic.
- copper-containing materials such as copper ore containing copper and copper concentrate
- copper ore containing copper and copper concentrate various methods for recovering copper from processing objects (hereinafter referred to as copper-containing materials) such as copper ore containing copper and copper concentrate.
- copper-containing materials such as copper ore containing copper and copper concentrate
- the following steps are performed.
- Electrolytic process In the electrolytic process, the anode is placed in an electrolytic tank filled with a sulfuric acid acid solution (electrolytic solution), and the current is passed between the cathode and the electrolytic purification is performed.
- electrolytic solution sulfuric acid acid solution
- the copper of the anode is dissolved, and then deposited on the cathode as electrolytic copper having a purity of 99.99%, resulting in a product.
- arsenic distributed to the anode is eluted into the electrolyte.
- the eluted arsenic is recovered as a copper removal slime by copper removal electrolysis. This copper removal slime is used as an intermediate raw material or is repeated in a furnace.
- arsenic distributed in the slag is fixed in a stable form.
- arsenic distributed to dust and decopperized slime is in an unstable form, and it is not desirable to dispose of arsenic out of the system as it is. Therefore, these dust and copper removal slime are repeated in the furnace or processed separately. In this way, most of the arsenic content in the copper concentrate is finally distributed to the slag and fixed in a stable form.
- the raw material situation has changed, and impurities in copper ore, especially arsenic quality, has been increasing year by year, and arsenic quality in the obtained copper concentrate has gradually increased.
- the arsenic grade in the copper concentrate before was about 0.1 to 0.2%, but it is not uncommon for the arsenic grade to exceed 1% in recent years. Therefore, even if the processing amount of the copper concentrate is the same as before, since the content of arsenic has increased, there has been a case where the processing fixed to the slag cannot catch up. In order to solve this problem, it is conceivable to newly install or reinforce slag treatment equipment, but this requires a great investment and increases the cost.
- Patent Document 1 discloses a method of separating arsenite contained in pyrite using flotation. This method includes adding a sulfuric acid-based inhibitor containing bisulfite ions such as sodium bisulfite to pyrite, further maintaining the pH of the slurry at 8 or less, and performing the flotation at a slurry temperature of 30 ° C. or higher. It separates pyrite and arsenite.
- a sulfuric acid-based inhibitor containing bisulfite ions such as sodium bisulfite
- arsenic exists as arsenic minerals such as tetrahedral arsenite ((CuFe) 12 As 4 S 13 ) and arsenous pyrite (Cu 3 AsS 4 ). In many cases, these arsenic minerals have floating characteristics similar to those of chalcopyrite and porphyry, and it is difficult to separate copper and arsenic by flotation.
- Patent Document 2 copper concentrate containing arsenic is subjected to heat treatment at 90 to 120 ° C., and then potassium hexacyanoferrate (II) (yellow blood salt: K) is used as a copper inhibitor. 4 [Fe (CN) 6 ]) is added to 10 to 15 kg per ton (t) of copper concentrate to suspend arsenic minerals and separate them from precipitated chalcopyrite and porphyry .
- This method oxidizes the surface of the copper mineral in the copper concentrate by heating, and forms an inactive oxide film on the surface, thereby making a difference in the surface chemical or crystal chemical state on the surface of the copper mineral and the arsenic mineral. This is thought to cause a difference in floatability in subsequent flotation.
- equipment and energy for heating a large amount of copper concentrate are required, and the cost increases accordingly.
- Non-Patent Document 1 discloses a method in which a slurry containing copper mineral is treated with hydrogen peroxide and then sodium nitrate is added to adjust the pH to 5 to perform flotation.
- the same document also proposes a method of performing flotation by adding hydrogen peroxide and EDTA to a copper mineral and then adjusting the pH to 11 with potassium hydroxide.
- these two methods have problems in terms of safety and cost during handling such as using deleterious substances.
- An object of the present invention is to provide a beneficiation method for efficiently separating an arsenic mineral from a copper-containing material containing arsenic in view of the above-mentioned problems of the prior art.
- a method for separating an arsenic mineral from a copper-containing material comprises a slurry comprising a copper-containing material containing arsenic containing an inhibitor, a foaming agent, and a collector.
- a method of separating arsenic minerals from copper-containing material by adding a selective agent and blowing air into the slurry to float the copper concentrate, and using sodium thiosulfate as the inhibitor It is characterized by.
- sodium thiosulfate is preferably added in an amount of 10 kg or more and 200 kg or less in terms of pentahydrate with respect to 1 t of the copper-containing material to be subjected to flotation.
- the copper-containing material may be copper ore or copper concentrate.
- an arsenic mineral can be separated as an arsenic concentrate from a high arsenic grade copper-containing material without using special equipment or chemicals, and a low arsenic grade copper concentrate can be obtained efficiently.
- a low arsenic grade copper concentrate can be obtained efficiently.
- FIG. 2 is a schematic flow diagram of a beneficiation method used in Examples 1 and 2 of the present invention.
- 6 is a graph showing the relationship between the amount of inhibitor added and the degree of separation obtained as a result of Examples 1 and 2 of the present invention.
- FIG. 5 is a schematic flow diagram of a beneficiation method used in Examples 3 to 6 of the present invention.
- 6 is a graph showing the relationship between the oxidation-reduction potential and the degree of separation of slurries obtained as a result of Examples 3 to 6 of the present invention.
- the arsenic grade and the mineral type of the arsenic mineral in the high arsenic grade copper-containing material treated in the present invention are not particularly limited. In order to perform flotation, it is not effective if the arsenic mineral is not present as a single particle. Therefore, it is desirable that most of the arsenic mineral is separated by pretreatment such as grinding. If good separation cannot be obtained because the arsenic mineral is densely bonded to the copper mineral, the present invention may be applied after the copper-containing material is pulverized by a wet ball mill or the like.
- the copper-containing material is copper ore as an example
- a method for separating arsenic minerals together with gangue from copper ore containing high-grade arsenic and recovering low-arsenic grade copper concentrate will be described in detail.
- the present invention is not limited to this example, and the copper-containing material may be copper concentrate. That is, the present invention is also applied to the case where arsenic mineral is separated from high arsenic grade copper concentrate obtained by using a conventional flotation method that has been conventionally used, and low arsenic grade copper concentrate is recovered. Can be applied.
- the copper grade of the high arsenic grade copper concentrate used as a raw material is not particularly limited.
- the copper-containing material is high arsenic grade copper ore
- the copper ore is pulverized as a pretreatment, and water is added to form a slurry.
- the slurry is subjected to flotation by adding a flotation agent including a foaming agent, a collection agent and an inhibitor.
- a flotation agent including a foaming agent, a collection agent and an inhibitor.
- sodium thiosulfate is used as an inhibitor.
- the form of sodium thiosulfate to be added is not particularly limited, and may be a powder or a solution.
- the amount of sodium thiosulfate added is preferably 10 kg or more and 200 kg or less in terms of pentahydrate per ton of copper-containing material to be supplied to the flotation. If this amount is less than 10 kg, the effect is hardly exhibited. On the other hand, when it exceeds 200 kg, the separation effect tends to decrease. In addition, if it is less than 50 kg, the separation effect shows an increasing tendency. Moreover, even if it adds exceeding 130 kg, the effect of isolation
- the addition of sodium thiosulfate changes the redox potential of the slurry.
- the oxidation-reduction potential exceeds 50 mV at a potential using a silver-silver chloride electrode as a reference electrode, the separation effect is limited. Conversely, when the oxidation-reduction potential is less than ⁇ 10 mV, the separation effect tends to decrease. Therefore, when flotation is performed, sodium thiosulfate is added to the slurry used for flotation, and the oxidation-reduction potential of the slurry is adjusted within a range of ⁇ 10 mV to 50 mV using a silver-silver chloride electrode as a reference electrode. Is preferred.
- the foaming agent and collection agent contained in the above-mentioned flotation agent are Cytec Industries Inc. X-95 and AP208 manufactured by the company are used, but the present invention is not particularly limited thereto, and other conventionally used ones may be used.
- the specific amount of the foaming agent and the collection agent should be determined in advance by conducting a preliminary test using a small amount of sample, or the amount that allows good separation to be obtained while appropriately adjusting while operating. That's fine.
- the flotation machine used in the present invention is not particularly limited, and a commercially available mechanical stirring type flotation machine or column type flotation machine can be used.
- the flotation time varies depending on the ratio of arsenic minerals contained in high-arsenic grade copper ore and copper concentrate and the desired degree of separation. It is preferable to select or adjust appropriately while operating.
- arsenic minerals contained in high arsenic grade copper-containing materials as sedimentation and low arsenic grade copper concentrate as floatation.
- low arsenic grade copper concentrate and arsenic concentrate can be obtained in the beneficiation process, so even if the arsenic content of the copper-containing material increases, slag treatment and decopperization in the dry smelting process
- the product electrolytic copper can be obtained by processing in the same manner as before without requiring a large investment such as enhancement of facilities for removing and recovering arsenic such as electrolysis.
- the arsenic concentrate can be separately treated to collect arsenic and use it as a raw material for metal arsenic, arsenic compounds, and the like, and it is also possible to recover copper distributed to the arsenic concentrate.
- the present invention will be described in more detail with reference to the following examples and comparative examples, but the present invention is not limited to these examples.
- the chemical analysis values were determined using ICP emission analysis, and the mineral ratio was determined by microscopic observation.
- the oxidation-reduction potential was a value measured using a silver-silver chloride electrode as a reference electrode.
- Example 1 Peruvian copper concentrate having the chemical analysis values and mineral proportions shown in Table 1 below was used as the copper-containing material.
- the Peruvian copper concentrate shown in Table 1 above was selected along the flow shown in FIG. 1 to obtain a low arsenic grade copper concentrate and an arsenic concentrate.
- the Peruvian copper concentrate was pulverized by a ball mill so that the 80% passing particle size was 15 ⁇ m (grinding step 1). 25 g of this pulverized product was collected, 400 ml of water was added, and the mixture was stirred for 3 minutes to form a slurry (slurry step 2). This slurry was charged into an agitaire type flotation tester having a cell capacity of 0.5 L.
- first flotation process 3 air was blown at a flow rate of 2 liters / min for 8 minutes to separate into the first floatation and the first sedimentation (first floatation process 3).
- the first flotation was repeated in the same flotation tester as a slurry.
- Sodium thiosulfate in an amount corresponding to 2 kg in terms of pentahydrate per ton of copper concentrate was added to the slurry of the first float ore and stirred for 3 minutes. Thereafter, flotation was performed for 5 minutes while blowing air at 2 liters / min to obtain a second floatation and a second sedimentation (second floatation process 4).
- the arsenic concentrate and the second floating ore were low arsenic grade copper concentrates, which were the arsenic concentrate and low arsenic grade copper concentrate of Sample 1.
- samples 2 to 5 were obtained by the following method. That is, the same beneficiation treatment as that for obtaining Sample 1 was carried out except that sodium thiosulfate was not added as an inhibitor after repulping, and the low arsenic grade copper concentrate and arsenic concentrate of Sample 2 were obtained.
- Sample 1 was used except that 0.4 g corresponding to a total of 16 kg in terms of monohydrate per 1 ton of copper concentrate supplied to flotation was used instead of sodium thiosulfate.
- the same beneficiation treatment as that for obtaining No. 1 was performed, and the low arsenic grade copper concentrate and arsenic concentrate of Sample 5 were obtained.
- the degree of separation is a scale indicating the degree of separation of copper and arsenic, and this is obtained by the following equation 1.
- Degree of separation (copper distribution ratio of low arsenic grade copper concentrate / copper distribution ratio of arsenic concentrate) / (arsenic distribution ratio of low arsenic grade copper concentrate / arsenic distribution ratio of arsenic concentrate)
- the arsenic grade 1.06% in the copper concentrate shown in Table 1 used in this example is equivalent to about five times the arsenic grade 0.2% previously treated.
- the daily processing volume of copper concentrate was low. It decreased to about 50% when using arsenic grade copper concentrate.
- a low arsenic grade copper concentrate with an arsenic grade of 0.38% can be obtained, and an operation for processing the same amount of copper concentrate as before can be performed, thereby reducing the investment required for equipment expansion. did it.
- Example 2 The low arsenic grade copper of Samples 6-17 was performed in the same manner as Sample 1 except that the total amount of sodium thiosulfate added was changed in the range of 25-271 kg per ton of copper concentrate used for flotation. Concentrate and arsenic concentrate were obtained. It should be noted that the amount of sodium thiosulfate added in the second flotation process 4 was 2 kg / t. Table 3 below shows the grade, distribution rate, and degree of separation of copper and arsenic in the obtained low arsenic grade copper concentrate and arsenic concentrate.
- the addition amount of the inhibitor is preferably 10 kg or more and 200 kg or less in terms of pentahydrate per 1 t of copper concentrate to be subjected to flotation.
- the addition amount of the inhibitor ranges from 50 kg to 130 kg. It turns out that it is more preferable.
- Example 3 Peruvian copper concentrates having chemical analysis values and mineral proportions shown in Table 4 below were used as copper-containing materials.
- the Peruvian copper concentrate shown in Table 4 above was selected along the flow shown in FIG. 3 to obtain a low arsenic grade copper concentrate and an arsenic concentrate. More specifically, the Peruvian copper concentrate shown in Table 4 was pulverized with a ball mill so that the 80% passing particle size was 15 ⁇ m (pulverization step 11). 100 g of this pulverized material was collected, 400 ml of water was added, and the mixture was stirred for 3 minutes to form a slurry (slurry step 12). This slurry was charged into an agitaire type flotation tester having a cell capacity of 0.5 L.
- Example 4 Samples 19 to 23 were prepared in the same manner as in Example 3 except that the amount of sodium thiosulfate added as an inhibitor after repulping was changed to adjust the oxidation-reduction potential of the slurry to any of the range of -8 to 49 mV. Of low arsenic copper concentrate and arsenic concentrate. For comparison, samples 24 to 25 of low arsenic grade copper concentrate and arsenic concentrate were obtained in the same manner as in Example 3 except that sodium thiosulfate was not added as an inhibitor after repulping.
- Example 5 The samples 26 to 30 were reduced in the same manner as in Example 3 except that the amount of sodium thiosulfate added as an inhibitor after repulping was changed to adjust the oxidation-reduction potential of the slurry to any one within the range of 59 to 158 mV. Arsenic grade copper concentrate and arsenic concentrate were obtained.
- Example 6 Low arsenic grade copper concentrate and arsenic concentrate of Sample 31 in the same manner as in Example 3 except that the amount of sodium thiosulfate added as an inhibitor after repulping was changed and the oxidation-reduction potential of the slurry was adjusted to -40 mV. And got.
- Samples 19 to 23 in which the oxidation-reduction potential of the slurry was adjusted to ⁇ 8 to 49 mV, were also treated with arsenic while maintaining the copper distribution ratio to low arsenic grade copper concentrate at around 80%, similar to Sample 18. It was confirmed that the distribution ratio of arsenic minerals was suppressed and a good separation effect of arsenic mineral was obtained. In contrast, in Samples 24 to 25 to which sodium thiosulfate was not added as an inhibitor, the oxidation-reduction potential of the slurry was as high as 163 to 182 mV, and the separation degrees were 4.4 and 8.3 and Samples 18 to 23. Was significantly lower than.
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Abstract
Description
選鉱工程では、鉱山で採掘された銅鉱石を粉砕した後、水を加えてスラリーとし、浮遊選鉱を行う。この浮遊選鉱では、スラリーに抑制剤、起泡剤、捕収剤などで構成される浮選剤を添加し、空気を吹き込んで銅を含む鉱物を浮遊させつつ、脈石を沈降させて分離を行う。これにより銅品位30%前後の銅精鉱が得られる。得られた銅精鉱は次工程の乾式製錬工程に送られる。
乾式製錬工程では、上記選鉱工程で得られた銅精鉱を自溶炉などの炉を用いて熔解し、転炉および精製炉を経て銅品位99%程度の粗銅にまで精製する。粗銅はアノードに鋳造された後、次工程の電解工程に送られる。この乾式製錬において、銅精鉱に含有される砒素は、スラグやダストや粗銅に分配される。スラグは水砕して埋立て材などに利用され、ダストは炉に繰り返される。また、銅精鉱に含有される硫黄は、亜硫酸ガスとして分離され、硫酸の原料となる。
電解工程では、硫酸酸性溶液(電解液)で満たされた電解槽に上記アノードを装入し、カソードとの間に通電して電解精製を行う。この電解精製によって、アノードの銅は溶解された後、カソード上に純度99.99%の電気銅として析出し、製品となる。この時、アノードに分配されていた砒素は電解液中に溶出する。溶出した砒素は、脱銅電解によって脱銅スライムとして回収される。この脱銅スライムは、中間原料とされたり、炉に繰り返されたりする。
実施例1では、含銅物として下記の表1に示す化学分析値及び鉱物割合を有するペルー産銅精鉱を使用した。
分離度=(低砒素品位銅精鉱の銅分配率/砒素濃縮物の銅分配率)/(低砒素品位銅精鉱の砒素分配率/砒素濃縮物の砒素分配率)
チオ硫酸ナトリウムの総添加量を浮遊選鉱に供される銅精鉱1t当たり合計25~271kgの範囲で変化させた以外は試料1を得る操作と同様に行って試料6~17の低砒素品位銅精鉱および砒素濃縮物を得た。なお、第2浮遊選鉱工程4でのチオ硫酸ナトリウムの添加量はすべて2kg/t相当分とした。得られた低砒素品位銅精鉱および砒素濃縮物の銅および砒素の品位、分配率、および分離度を下記表3に示す。
実施例3では、含銅物として下記の表4に示す化学分析値及び鉱物割合を有するペルー産銅精鉱を使用した。
レパルプ後に抑制剤として添加するチオ硫酸ナトリウムの添加量を変えてスラリーの酸化還元電位を-8~49mVの範囲内のいずれかに調整した以外は上記実施例3と同様にして、試料19~23の低砒素銅精鉱と砒素濃縮物とを得た。また、比較のため、レパルプ後に抑制剤としてチオ硫酸ナトリウムを添加しなかった以外は上記実施例3と同様にして、試料24~25の低砒素品位銅精鉱と砒素濃縮物とを得た。
レパルプ後に抑制剤として添加するチオ硫酸ナトリウムの添加量を変えてスラリーの酸化還元電位を59~158mVの範囲内のいずれかに調整した以外は上記実施例3と同様にして試料26~30の低砒素品位銅精鉱と砒素濃縮物とを得た。
レパルプ後に抑制剤として添加するチオ硫酸ナトリウムの添加量を変えてスラリーの酸化還元電位を-40mVに調整した以外は上記実施例3と同様にして試料31の低砒素品位銅精鉱と砒素濃縮物とを得た。
2、12 スラリー化工程
3 第1浮遊選鉱工程
4 第2浮遊選鉱工程
13 浮遊選鉱工程
Claims (5)
- 砒素を含有する含銅物からなるスラリーに抑制剤、起泡剤、および捕収剤を含む浮選剤を添加し、空気をこのスラリー中に吹き込んで銅精鉱を浮遊させる浮遊選鉱を行うことによって含銅物から砒素鉱物を分離する方法であって、該抑制剤にチオ硫酸ナトリウムを用いることを特徴とする含銅物からの砒素鉱物の分離方法。
- 前記チオ硫酸ナトリウムは、前記浮遊選鉱に供される含銅物1tに対して5水塩換算で10kg以上、200kg以下添加することを特徴とする、請求項1に記載の含銅物からの砒素鉱物の分離方法。
- 前記スラリーの酸化還元電位を銀-塩化銀電極を参照電極として-10mV以上、50mV以下の範囲内に調整して前記浮遊選鉱を行うことを特徴とする、請求項1又は2に記載の含銅物からの砒素鉱物の分離方法。
- 前記含銅物が銅鉱石であることを特徴とする、請求項1~3のいずれかに記載の含銅物からの砒素鉱物の分離方法。
- 前記含銅物が銅精鉱であることを特徴とする、請求項1~3のいずれかに記載の含銅物からの砒素鉱物の分離方法。
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JP7385872B2 (ja) * | 2021-12-17 | 2023-11-24 | 国立大学法人九州大学 | 選鉱方法 |
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JPS51119615A (en) * | 1975-04-15 | 1976-10-20 | Nippon Mining Co Ltd | A method for separating and recovering copper and lead concentrates fr om a mixed concentrate |
JP2006239553A (ja) * | 2005-03-03 | 2006-09-14 | Sumitomo Metal Mining Co Ltd | 銅精鉱からの砒素鉱物の分離方法 |
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CN107694741A (zh) * | 2017-11-01 | 2018-02-16 | 紫金矿业集团股份有限公司 | 一种铜精矿除砷的方法 |
CN110373551A (zh) * | 2019-08-19 | 2019-10-25 | 中南大学 | 一种综合处理铜冶炼烟尘和黑铜泥的方法 |
CN110373551B (zh) * | 2019-08-19 | 2021-03-12 | 中南大学 | 一种综合处理铜冶炼烟尘和黑铜泥的方法 |
WO2022038854A1 (ja) * | 2020-08-21 | 2022-02-24 | Jx金属株式会社 | 浮遊選鉱方法及び、銅の回収方法 |
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