CN104726706A - Low acid consumption and heap leaching new technology of high-magnesium low grade nickel sulfide ores - Google Patents
Low acid consumption and heap leaching new technology of high-magnesium low grade nickel sulfide ores Download PDFInfo
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- CN104726706A CN104726706A CN201310713716.1A CN201310713716A CN104726706A CN 104726706 A CN104726706 A CN 104726706A CN 201310713716 A CN201310713716 A CN 201310713716A CN 104726706 A CN104726706 A CN 104726706A
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- 238000002386 leaching Methods 0.000 title claims abstract description 160
- 239000011777 magnesium Substances 0.000 title claims abstract description 55
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 54
- 239000002253 acid Substances 0.000 title claims abstract description 39
- WWNBZGLDODTKEM-UHFFFAOYSA-N sulfanylidenenickel Chemical compound [Ni]=S WWNBZGLDODTKEM-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000005516 engineering process Methods 0.000 title abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 64
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000000523 sample Substances 0.000 claims abstract description 27
- 230000003647 oxidation Effects 0.000 claims abstract description 17
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 17
- 239000000243 solution Substances 0.000 claims description 57
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 50
- 238000002203 pretreatment Methods 0.000 claims description 34
- 239000007921 spray Substances 0.000 claims description 33
- 239000001117 sulphuric acid Substances 0.000 claims description 26
- 235000011149 sulphuric acid Nutrition 0.000 claims description 26
- 241000894006 Bacteria Species 0.000 claims description 21
- 241000605222 Acidithiobacillus ferrooxidans Species 0.000 claims description 18
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 16
- 241000588902 Zymomonas mobilis Species 0.000 claims description 9
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 claims description 9
- 239000002054 inoculum Substances 0.000 claims description 9
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000010790 dilution Methods 0.000 claims description 8
- 239000012895 dilution Substances 0.000 claims description 8
- 239000013589 supplement Substances 0.000 claims description 8
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- 239000005083 Zinc sulfide Substances 0.000 claims description 3
- 238000005987 sulfurization reaction Methods 0.000 claims description 3
- 229910052984 zinc sulfide Inorganic materials 0.000 claims description 3
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 claims description 3
- BWFPGXWASODCHM-UHFFFAOYSA-N copper monosulfide Chemical compound [Cu]=S BWFPGXWASODCHM-UHFFFAOYSA-N 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 42
- 229910052759 nickel Inorganic materials 0.000 abstract description 21
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 13
- 239000011707 mineral Substances 0.000 abstract description 13
- 229910001607 magnesium mineral Inorganic materials 0.000 abstract description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 244000005700 microbiome Species 0.000 abstract 2
- 238000005507 spraying Methods 0.000 abstract 2
- 238000010276 construction Methods 0.000 abstract 1
- 238000011081 inoculation Methods 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 150000002739 metals Chemical class 0.000 abstract 1
- 239000011593 sulfur Substances 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 abstract 1
- 230000001502 supplementing effect Effects 0.000 abstract 1
- 235000010755 mineral Nutrition 0.000 description 12
- 238000001514 detection method Methods 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 8
- 238000009423 ventilation Methods 0.000 description 8
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 4
- 239000000395 magnesium oxide Substances 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 229910052954 pentlandite Inorganic materials 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 3
- 229910052683 pyrite Inorganic materials 0.000 description 3
- 239000011028 pyrite Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 235000014380 magnesium carbonate Nutrition 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- HLLSOEKIMZEGFV-UHFFFAOYSA-N 4-(dibutylsulfamoyl)benzoic acid Chemical compound CCCCN(CCCC)S(=O)(=O)C1=CC=C(C(O)=O)C=C1 HLLSOEKIMZEGFV-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000006701 autoxidation reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052951 chalcopyrite Inorganic materials 0.000 description 1
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910001779 copper mineral Inorganic materials 0.000 description 1
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical compound [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 229910001656 zinc mineral Inorganic materials 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a low acid consumption and heap leaching new technology of high-magnesium low grade nickel sulfide ores. The technology comprises the following steps: carrying out ore heap construction and pretreatment: crushing ores, constructing a heap, burying a pH probe in the ore heap, spraying the ore heap with a diluted sulfuric acid solution to realize pretreatment until the pH value in the ore heap and of a leachate reaches 2.5-3.0; and carrying out heap leaching: carrying out spraying inoculation on acidophilic microorganisms with iron and sulfur oxidation ability, and momentarily supplementing diluted sulfuric acid in the heap leaching process in order to maintain the pH value in the ore heap and of the leachate in a range of 3.0-5.0. The technology is different from routine technologies allowing biological leaching systems to have pH value of below 2.5, allows the pH value of a leaching system to be controlled in a range of 3.0-5.0, guarantees the normal vitality of the acidophilic microorganisms, reduces the dissolving rate of magnesium mineral, reduces the acid consumption by 64-90%, and realizes high efficiency leaching of the nickel mineral. The technology for the high-magnesium low grade nickel sulfide ores has the advantages of low cost, simple process, and high recovery rate of metals with high values.
Description
Technical field
The present invention relates to the low acid consumption biological dump leaching novel process of the low-grade nickel sulfide ore of a kind of high magnesium types.
Background technology
Explored nickel minerals point more than 80 place of China, basic unit price is 1,000 ten thousand tons, and account for the 8th, the world, wherein sulphide ores accounts for 86% of total nickel reserves.The nickel sulfide ore Jinchuan Nickel Mine that China is maximum, nickel metal reserves 5,480,000 tons, account for 68.5% of national total reserves, but the average grade of Jinchuan more than 2/3 nickel sulfide ores only has 0.6%, and content of MgO, up to 30 ~ 35%, is the low-grade nickel sulfide ore of typical high magnesium types in ore.
For the low-grade nickel sulfide ore of high magnesium types, traditional treatment process is flotation-pyrometallurgical smelting, but usually because content of MgO in flotation concentrate is too high, smelting cost is caused to increase, and slag phase viscosity therefore can be caused excessive and cause stove dross, slag is separated difficulty, reduces smelting recovery.At wet-leaching process aspect, Central South University develops ammonia-ammonium salt system extract technology, and the leaching yield of nickel is only 42.86% at ambient pressure, and application practice is infeasible.Chinese patent (CN102094127B) discloses a kind of method reclaiming nickel and magnesium elements from the low-grade nickel sulfide ore of high magnesium types.After calcining 1 ~ 3h at-200 order sample ores and ammonium sulfate are blended in 350 ~ 450 DEG C, sample ore leaches 1 ~ 3h through the aqueous solution, and leaching slag adopts Bioleaching again.This technique ore grinding, calcining cost are high, are not suitable for for low-grade nickel sulfide ore.In bioleaching process, Chinese patent (CN100422358C) is by adding pyrite or SULPHUR POWDER, utilize bacterium autoxidation to produce acid and maintain the leaching containing basic gangue sulphide ores, but interpolation pyrite or SULPHUR POWDER need be considered cost and carry out source problem, and for high magnesium types sulphide ores (being greater than 12% containing magnesium oxide) even if the pyrite of interpolation 10%, the sour consumption of reality when high magnesium types ore leaches can not be met.Consumption acids magnesium-containing mineral during Central South University utilizes the smelting acid waste water of Jinchuan smeltery complete and in ore, then carry out standard biologic leaching, obtain the leaching efficiency of Ni84.6%, Co75.0%, Cu32.6%, but acid consumption reaches 600kg/t ore deposit.This kind of technique is adopted to there are following three problems: 1. in solution, Mg content will reach 20 ~ 40g/L, be 50 ~ 100 times of Ni content, will cause serious challenge to the recovery of the separation of Ni, Mg in solution and nickel.2. bacterium has certain resistance to limited for the Mg2+ concentration of high density, generally more than 20g/L by complete Antibacterial activity, cause Bioleaching failure.3. sour source and Cost Problems.This technique is only applicable to the mine that sulfuric acid does not assess the cost, and for the mine that sulfuric acid assesses the cost, only sulfuric acid consumption takes the value that one just may exceed ore itself.
Therefore, for the low-grade nickel sulfide ore of high magnesium types, need a kind of new technique of exploitation badly, solve the high difficult problem be separated with subsequent solution of acid consumption when leaching.
Summary of the invention
The object of the invention is to, the low acid consumption biological dump leaching novel process of the low-grade nickel sulfide ore of a kind of high magnesium types is provided, the leaching of nickel mineral can be ensured while lower magnesium mineral dissolves.
For achieving the above object, the present invention takes following design:
A low acid consumption biological dump leaching novel process for the low-grade nickel sulfide ore of high magnesium types, it comprises the following steps:
(1) ore builds heap and pre-treatment: build heap after being become by ore grinding particle diameter to be less than 20mm, and in ore deposit is piled, bury pH probe underground, and pre-treatment dilution heat of sulfuric acid spray ore deposit heap, reaches 2.5 ~ 3.0 to heap inside, ore deposit and pH of leaching solution;
(2) biological dump leaching: spray the acidophilic microbes that inoculates into having iron sulphur oxidation capacity, in heap leaching process, monitors the inner and pH of leaching solution of ore deposit heap at any time, supplements dilute sulphuric acid to maintain heap inside, ore deposit and pH of leaching solution between 3.0 ~ 5.0.
Low acid consumption biological dump leaching novel process as above, preferably, the low-grade nickel sulfide ore of described high magnesium types is nickeliferous is less than 0.6%, magnesium is greater than 12%.
Low acid consumption biological dump leaching novel process as above, preferably, described in build heap and adopt nature to stack, form naturally piling of multiple hole, ore deposit heap individual layer height is 6 ~ 8m.
Low acid consumption biological dump leaching novel process as above, preferably, the pH value of described dilute sulphuric acid is 1.0 ~ 2.0.
Low acid consumption biological dump leaching novel process as above, preferably, in described step (2), inoculum size is 1.0 × 10
5individual bacterium/g ore deposit ~ 1.0 × 10
6individual bacterium/g ore deposit.
Low acid consumption biological dump leaching novel process as above, preferably, in described step (2), described acidophilic microbes be acidithiobacillus ferrooxidans, sulfur oxide thiobacillus ferrooxidans, addicted to the mixed strains in pozzuolite Zymomonas mobilis.
Low acid consumption biological dump leaching novel process as above, preferably, in described step (2), described three kinds of acidophilic microbes for ratio be 30%, 30%, 40%.
A low acid consumption biological dump leaching novel process for high magnesium types copper-sulphide ores, it comprises the following steps:
(1) ore builds heap and pre-treatment: build heap after being become by ore grinding particle diameter to be less than 20mm, and in ore deposit is piled, bury pH probe underground, and pre-treatment dilution heat of sulfuric acid spray ore deposit heap, reaches 2.5 ~ 3.0 to heap inside, ore deposit and pH of leaching solution;
(2) biological dump leaching: spray the acidophilic microbes bacterium that inoculates into having iron sulphur oxidation capacity, in heap leaching process, monitors the inner and pH of leaching solution of ore deposit heap at any time, supplements dilute sulphuric acid to maintain heap inside, ore deposit and pH of leaching solution between 3.0 ~ 5.0.
A low acid consumption biological dump leaching novel process for high magnesium types sulfuration cobalt ore, it comprises the following steps:
(1) ore builds heap and pre-treatment: build heap after being become by ore grinding particle diameter to be less than 20mm, and in ore deposit is piled, bury pH probe underground, and pre-treatment dilution heat of sulfuric acid spray ore deposit heap, reaches 2.5 ~ 3.0 to heap inside, ore deposit and pH of leaching solution;
(2) biological dump leaching: spray the acidophilic microbes bacterium that inoculates into having iron sulphur oxidation capacity, in heap leaching process, monitors the inner and pH of leaching solution of ore deposit heap at any time, supplements dilute sulphuric acid to maintain heap inside, ore deposit and pH of leaching solution between 3.0 ~ 5.0.
A low acid consumption biological dump leaching novel process for high magnesium types zinc sulfide ore, it comprises the following steps:
(1) ore builds heap and pre-treatment: build heap after being become by ore grinding particle diameter to be less than 20mm, and in ore deposit is piled, bury pH probe underground, and pre-treatment dilution heat of sulfuric acid spray ore deposit heap, reaches 2.5 ~ 3.0 to heap inside, ore deposit and pH of leaching solution;
(2) biological dump leaching: spray the acidophilic microbes bacterium that inoculates into having iron sulphur oxidation capacity, in heap leaching process, monitors the inner and pH of leaching solution of ore deposit heap at any time, supplements dilute sulphuric acid to maintain heap inside, ore deposit and pH of leaching solution between 3.0 ~ 5.0.
Beneficial effect of the present invention is: investigator of the present invention finds, the acidophilic bacteria growth pH value range adopted during Bioleaching is wider, usually between 1.0 ~ 5.0, and still has the ability leaching nickel sulfide ore in pH value more than 3.0.In addition, the leaching for MgO finds, when pH value 1.0, in 40 days, the leaching yield of magnesium is 60%, and during pH value 2.5, the leaching yield of magnesium is only 20%.Therefore, more than 3.0 can be remained on by controlling leaching process pH value, reducing the dissolving ensureing nickel mineral while magnesium-containing mineral dissolves.Low acid consumption biological dump leaching novel process of the present invention; be different from standard biologic Leaching Systems pH value below 2.5; but in the low-grade nickel sulfide ore leaching process of high magnesium types; the pH value of Leaching Systems is controlled between 3.0 ~ 5.0; ensure the normal activity of acidophilic microbes, reduce magnesium mineral dissolution rate, reach the efficient leaching of nickel mineral simultaneously; and greatly reduce the consumption of sulfuric acid, effectively cost-saving.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of an embodiment of the present invention.
Fig. 2 of the present inventionly builds pile structure schematic diagram.
Embodiment
As shown in Figure 1, by low-grade for high magnesium types nickel sulfide ore through ore reduction 1, then carry out ore and build heap 2, in this stage, the solution of spray pH value 1.0 ~ 2.0 carries out pre-treatment, on biological dump leaching rank 4, inoculates into acidophilic bacteria 3, control leaching process pH value 3.0 ~ 5.0, final acquisition leach liquor 5 simultaneously.Heap bioleaching process provided by the invention, comprises the following steps:
(1) ore builds heap and pre-treatment
Ore grinding is less than 20mm to particle diameter, then starts to carry out building heap.As shown in Figure 2, when building heap, in heap, bury pH probe 1,2,3 underground, so that Real-Time Monitoring ore deposit heap internal pH-values situation.Build in heap process and ore will be kept to form nature stacking as far as possible, form naturally piling of multiple hole, be conducive to the growth of piling interior ventilation and leaching microbacteria, the ore deposit finally built up heap 4, its individual layer height is preferably 6 ~ 8m.The pre-treatment dilute sulphuric acid spray ore deposit heap of pH value 1.0 ~ 2.0, increasess slowly to heap inside, ore deposit and pH of leaching solution.
(2) biological dump leaching
After pre-treatment completes, spray is inoculated into the acidophilic microbes with iron sulphur oxidation capacity well-known in the art, and according to ore deposit heap internal pH probe detection case and pH of leaching solution situation, add dilute sulphuric acid and maintain the inner and pH of leaching solution of ore deposit heap between 3.0 ~ 5.0.
The principle of the inventive method is, controls between 3.0 ~ 5.0 by the pH value of Leaching Systems, ensures the normal activity of acidophilic microbes, reduces magnesium mineral dissolution rate, reaches the efficient leaching of nickel mineral simultaneously.
Below by way of specific embodiment, the invention will be further described.
Embodiment 1
The low-grade nickel sulfide ore of certain high magnesium types, nickeliferous 0.21%, magnesium 23.24%, nickel mineral mainly exists with the form of pentlandite (0.40%), and magnesium mineral is mainly with the form existence of peridotites (48.80%) and serpentine (29.63%).
(1) ore builds heap and pre-treatment
Ore grinding is less than 20mm to particle diameter, then starts to carry out building heap.Building in heap process, in heap, burying pH probe underground, so that Real-Time Monitoring ore deposit heap internal pH-values situation.Build in heap process and ore will be kept to form nature stacking as far as possible, form naturally piling of multiple hole, be conducive to the growth of piling interior ventilation and leaching microbacteria, its individual layer height is 8m.The pre-treatment dilute sulphuric acid spray ore deposit heap of pH value 1.0, increasess slowly to heap inside, ore deposit and pH of leaching solution.
(2) biological dump leaching
Heap inner and pH of leaching solution in ore deposit reaches 2.5, the acidophilic microbes that spray is inoculated into having iron sulphur oxidation capacity, i.e. acidithiobacillus ferrooxidans, sulfur oxide thiobacillus ferrooxidans and addicted to pozzuolite Zymomonas mobilis, and ratio is 30%, 30%, 40%, and inoculum size is 1.0 × 10
5individual bacterium/g ore deposit, and according to ore deposit heap internal pH probe detection case and pH of leaching solution situation, adds dilute sulphuric acid and maintains the inner and pH of leaching solution of ore deposit heap 2.0.Through the leaching of 600 days, the leaching yield of nickel was 82%, and the leaching yield of magnesium is 64%, and acid consumption is the 700kg vitriol oil/t ore deposit.
Embodiment 2
The low-grade nickel sulfide ore of certain high magnesium types, nickeliferous 0.21%, magnesium 23.24%, nickel mineral mainly exists with the form of pentlandite (0.40%), and magnesium mineral is mainly with the form existence of peridotites (48.80%) and serpentine (29.63%).
(1) ore builds heap and pre-treatment
Ore grinding is less than 20mm to particle diameter, then starts to carry out building heap.Building in heap process, in heap, burying pH probe underground, so that Real-Time Monitoring ore deposit heap internal pH-values situation.Build in heap process and ore will be kept to form nature stacking as far as possible, form naturally piling of multiple hole, be conducive to the growth of piling interior ventilation and leaching microbacteria, its individual layer height is 8m.The pre-treatment dilute sulphuric acid spray ore deposit heap of pH value 1.0, increasess slowly to heap inside, ore deposit and pH of leaching solution.
(2) biological dump leaching
Heap inner and pH of leaching solution in ore deposit reaches 2.5, the acidophilic microbes that spray is inoculated into having iron sulphur oxidation capacity, i.e. acidithiobacillus ferrooxidans, sulfur oxide thiobacillus ferrooxidans and addicted to pozzuolite Zymomonas mobilis, and ratio is 30%, 30%, 40%, and inoculum size is 1.0 × 10
5individual bacterium/g ore deposit, and according to ore deposit heap internal pH probe detection case and pH of leaching solution situation, adds dilute sulphuric acid and maintains the inner and pH of leaching solution of ore deposit heap 3.0.Through the leaching of 600 days, the leaching yield of nickel was 80%, and the leaching yield of magnesium is 29%, and acid consumption is the 250kg vitriol oil/t ore deposit.
Embodiment 3
The low-grade nickel sulfide ore of certain high magnesium types, nickeliferous 0.21%, magnesium 23.24%, nickel mineral mainly exists with the form of pentlandite (0.40%), and magnesium mineral is mainly with the form existence of peridotites (48.80%) and serpentine (29.63%).
(1) ore builds heap and pre-treatment
Ore grinding is less than 20mm to particle diameter, then starts to carry out building heap.Building in heap process, in heap, burying pH probe underground, so that Real-Time Monitoring ore deposit heap internal pH-values situation.Build in heap process and ore will be kept to form nature stacking as far as possible, form naturally piling of multiple hole, be conducive to the growth of piling interior ventilation and leaching microbacteria, its individual layer height is preferably 8m.The pre-treatment dilute sulphuric acid spray ore deposit heap of pH value 1.0, increasess slowly to heap inside, ore deposit and pH of leaching solution.
(2) biological dump leaching
Heap inner and leach liquor pH in ore deposit reaches 2.5, the acidophilic microbes that spray is inoculated into having iron sulphur oxidation capacity, i.e. acidithiobacillus ferrooxidans, sulfur oxide thiobacillus ferrooxidans and addicted to pozzuolite Zymomonas mobilis, and ratio is 30%, 30%, 40%, and inoculum size is 1.0 × 10
5individual bacterium/g ore deposit, and according to ore deposit heap internal pH probe detection case and pH of leaching solution situation, adds dilute sulphuric acid and maintains the inner and pH of leaching solution of ore deposit heap 4.0.Through the leaching of 600 days, the leaching yield of nickel was 76%, and the leaching yield of magnesium is 22%, and acid consumption is the 170kg vitriol oil/t ore deposit.
Embodiment 4
The low-grade nickel sulfide ore of certain high magnesium types, nickeliferous 0.21%, magnesium 23.24%, nickel mineral mainly exists with the form of pentlandite (0.40%), and magnesium mineral is mainly with the form existence of peridotites (48.80%) and serpentine (29.63%).
(1) ore builds heap and pre-treatment
Ore grinding is less than 20mm to particle diameter, then starts to carry out building heap.Building in heap process, in heap, burying pH probe underground, so that Real-Time Monitoring ore deposit heap internal pH-values situation.Build in heap process and ore will be kept to form nature stacking as far as possible, form naturally piling of multiple hole, be conducive to the growth of piling interior ventilation and leaching microbacteria, its individual layer height is preferably 8m.The pre-treatment dilute sulphuric acid spray ore deposit heap of pH value 1.0, increasess slowly to heap inside, ore deposit and pH of leaching solution.
(2) biological dump leaching
Heap inner and leach liquor pH in ore deposit reaches 2.5, the acidophilic microbes that spray is inoculated into having iron sulphur oxidation capacity, i.e. acidithiobacillus ferrooxidans, sulfur oxide thiobacillus ferrooxidans and addicted to pozzuolite Zymomonas mobilis, and ratio is 30%, 30%, 40%, and inoculum size is 1.0 × 10
5individual bacterium/g ore deposit, and according to ore deposit heap internal pH probe detection case and pH of leaching solution situation, adds dilute sulphuric acid and maintains the inner and pH of leaching solution of ore deposit heap 5.0.Through the leaching of 600 days, the leaching yield of nickel was 70%, and the leaching yield of magnesium is 10%, and acid consumption is the 70kg vitriol oil/t ore deposit.
Embodiment 5
Certain high magnesium types low-grade copper sulfide ores, cupric 0.35%, magnesium 12.37%, copper mineral mainly exists with the form of chalcopyrite (0.65%), and magnesium mineral mainly exists with the form of rhombspar (26%) and magnesite (17%).
(1) ore builds heap and pre-treatment
Ore grinding is less than 20mm to particle diameter, then starts to carry out building heap.Building in heap process, in heap, burying pH probe underground, so that Real-Time Monitoring ore deposit heap internal pH-values situation.Build in heap process and ore will be kept to form nature stacking as far as possible, form naturally piling of multiple hole, be conducive to the growth of piling interior ventilation and leaching microbacteria, its individual layer height is 8m.The pre-treatment dilute sulphuric acid spray ore deposit heap of pH value 1.0, increasess slowly to heap inside, ore deposit and pH of leaching solution.
(2) biological dump leaching
Heap inner and pH of leaching solution in ore deposit reaches 2.5, the acidophilic microbes that spray is inoculated into having iron sulphur oxidation capacity, i.e. acidithiobacillus ferrooxidans, sulfur oxide thiobacillus ferrooxidans and addicted to pozzuolite Zymomonas mobilis, and ratio is 30%, 30%, 40%, and inoculum size is 1.0 × 10
5individual bacterium/g ore deposit, and according to ore deposit heap internal pH probe detection case and pH of leaching solution situation, adds dilute sulphuric acid and maintains the inner and pH of leaching solution of ore deposit heap 3.0.Through the leaching of 600 days, the leaching yield of copper was 40%, and the leaching yield of magnesium is 25%, and acid consumption is the 125kg vitriol oil/t ore deposit.
Embodiment 6
The low-grade sulfuration cobalt ore of certain high magnesium types, containing cobalt 0.013%, magnesium 21.22%, magnesium mineral mainly exists with the form of peridotites (41.13%) and serpentine (31.48%).
(1) ore builds heap and pre-treatment
Ore grinding is less than 20mm to particle diameter, then starts to carry out building heap.Building in heap process, in heap, burying pH probe underground, so that Real-Time Monitoring ore deposit heap internal pH-values situation.Build in heap process and ore will be kept to form nature stacking as far as possible, form naturally piling of multiple hole, be conducive to the growth of piling interior ventilation and leaching microbacteria, its individual layer height is 8m.The pre-treatment dilute sulphuric acid spray ore deposit heap of pH value 1.0, increasess slowly to heap inside, ore deposit and pH of leaching solution.
(2) biological dump leaching
Heap inner and pH of leaching solution in ore deposit reaches 2.5, the acidophilic microbes that spray is inoculated into having iron sulphur oxidation capacity, i.e. acidithiobacillus ferrooxidans, sulfur oxide thiobacillus ferrooxidans and addicted to pozzuolite Zymomonas mobilis, and ratio is 30%, 30%, 40%, and inoculum size is 1.0 × 10
5individual bacterium/g ore deposit, and according to ore deposit heap internal pH probe detection case and pH of leaching solution situation, adds dilute sulphuric acid and maintains the inner and pH of leaching solution of ore deposit heap 3.0.Through the leaching of 600 days, the leaching yield of cobalt was 70%, and the leaching yield of magnesium is 28%, and acid consumption is the 220kg vitriol oil/t ore deposit.
Embodiment 7
Certain high magnesium types low grade zinc sulfide ore deposit, containing zinc 2.0%, magnesium 15.13%, zinc mineral mainly exists with the form of zink sulphide (4.27%), and magnesium mineral mainly exists with the form of rhombspar (31.80%) and magnesite (20.80%).
(1) ore builds heap and pre-treatment
Ore grinding is less than 20mm to particle diameter, then starts to carry out building heap.Building in heap process, in heap, burying pH probe underground, so that Real-Time Monitoring ore deposit heap internal pH-values situation.Build in heap process and ore will be kept to form nature stacking as far as possible, form naturally piling of multiple hole, be conducive to the growth of piling interior ventilation and leaching microbacteria, its individual layer height is 8m.The pre-treatment dilute sulphuric acid spray ore deposit heap of pH value 1.0, increasess slowly to heap inside, ore deposit and pH of leaching solution.
(2) biological dump leaching
Heap inner and pH of leaching solution in ore deposit reaches 2.5, the acidophilic microbes that spray is inoculated into having iron sulphur oxidation capacity, i.e. acidithiobacillus ferrooxidans, sulfur oxide thiobacillus ferrooxidans and addicted to pozzuolite Zymomonas mobilis, and ratio is 30%, 30%, 40%, and inoculum size is 1.0 × 10
5individual bacterium/g ore deposit, and according to ore deposit heap internal pH probe detection case and pH of leaching solution situation, adds dilute sulphuric acid and maintains the inner and pH of leaching solution of ore deposit heap 3.0.Through the leaching of 200 days, the leaching yield of zinc was 85%, and the leaching yield of magnesium is 25%, and acid consumption is the 150kg vitriol oil/t ore deposit.
As can be seen here, by technical scheme as above, the present invention is directed to the low-grade nickel sulfide ore of high magnesium types, by controlling the pH value in leaching process, decreasing the dissolving of magnesium mineral, the reduction by 64% ~ 90% of acid consumption can be made, ensure that the efficient leaching of nickel mineral simultaneously.
Claims (10)
1. a low acid consumption biological dump leaching novel process for the low-grade nickel sulfide ore of high magnesium types, it is characterized in that, it comprises the following steps:
(1) ore builds heap and pre-treatment: build heap after being become by ore grinding particle diameter to be less than 20mm, and in ore deposit is piled, bury pH probe underground, and pre-treatment dilution heat of sulfuric acid spray ore deposit heap, reaches 2.5 ~ 3.0 to heap inside, ore deposit and pH of leaching solution;
(2) biological dump leaching: spray the acidophilic microbes that inoculates into having iron sulphur oxidation capacity, in heap leaching process, monitors the inner and pH of leaching solution of ore deposit heap at any time, supplements dilute sulphuric acid to maintain heap inside, ore deposit and pH of leaching solution between 3.0 ~ 5.0.
2. low acid consumption biological dump leaching novel process as claimed in claim 1, is characterized in that, the low-grade nickel sulfide ore of described high magnesium types is nickeliferous is less than 0.6%, magnesium is greater than 12%.
3. low acid consumption biological dump leaching novel process as claimed in claim 1 or 2, is characterized in that, described in build heap and adopt nature to stack, form naturally piling of multiple hole, ore deposit heap individual layer height is 6 ~ 8m.
4. low acid consumption biological dump leaching novel process as claimed in claim 1, it is characterized in that, the pH value of described dilute sulphuric acid is 1.0 ~ 2.0.
5. low acid consumption biological dump leaching novel process as claimed in claim 1, it is characterized in that, in described step (2), inoculum size is 1.0 × 10
5individual bacterium/g ore deposit ~ 1.0 × 10
6individual bacterium/g ore deposit.
6. low acid consumption biological dump leaching novel process as claimed in claim 1, is characterized in that, in described step (2), described acidophilic microbes is acidithiobacillus ferrooxidans, sulfur oxide thiobacillus ferrooxidans, mixed strains addicted to pozzuolite Zymomonas mobilis.
7. low acid consumption biological dump leaching novel process as claimed in claim 6, it is characterized in that, in described step (2), the ratio of described acidophilic microbes is 30%, 30%, 40%.
8. a low acid consumption biological dump leaching novel process for high magnesium types copper-sulphide ores, it is characterized in that, it comprises the following steps:
(1) ore builds heap and pre-treatment: build heap after being become by ore grinding particle diameter to be less than 20mm, and in ore deposit is piled, bury pH probe underground, and pre-treatment dilution heat of sulfuric acid spray ore deposit heap, reaches 2.5 ~ 3.0 to heap inside, ore deposit and pH of leaching solution;
(2) biological dump leaching: spray the acidophilic microbes bacterium that inoculates into having iron sulphur oxidation capacity, in heap leaching process, monitors the inner and pH of leaching solution of ore deposit heap at any time, supplements dilute sulphuric acid to maintain heap inside, ore deposit and pH of leaching solution between 3.0 ~ 5.0.
9. a low acid consumption biological dump leaching novel process for high magnesium types sulfuration cobalt ore, it is characterized in that, it comprises the following steps:
(1) ore builds heap and pre-treatment: build heap after being become by ore grinding particle diameter to be less than 20mm, and in ore deposit is piled, bury pH probe underground, and pre-treatment dilution heat of sulfuric acid spray ore deposit heap, reaches 2.5 ~ 3.0 to heap inside, ore deposit and pH of leaching solution;
(2) biological dump leaching: spray the acidophilic microbes bacterium that inoculates into having iron sulphur oxidation capacity, in heap leaching process, monitors the inner and pH of leaching solution of ore deposit heap at any time, supplements dilute sulphuric acid to maintain heap inside, ore deposit and pH of leaching solution between 3.0 ~ 5.0.
10. a low acid consumption biological dump leaching novel process for high magnesium types zinc sulfide ore, it is characterized in that, it comprises the following steps:
(1) ore builds heap and pre-treatment: build heap after being become by ore grinding particle diameter to be less than 20mm, and in ore deposit is piled, bury pH probe underground, and pre-treatment dilution heat of sulfuric acid spray ore deposit heap, reaches 2.5 ~ 3.0 to heap inside, ore deposit and pH of leaching solution;
(2) biological dump leaching: spray the acidophilic microbes bacterium that inoculates into having iron sulphur oxidation capacity, in heap leaching process, monitors the inner and pH of leaching solution of ore deposit heap at any time, supplements dilute sulphuric acid to maintain heap inside, ore deposit and pH of leaching solution between 3.0 ~ 5.0.
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