CN101781705A - Method for microorganism-pelleting heap leaching of earthy oxide copper ores - Google Patents

Method for microorganism-pelleting heap leaching of earthy oxide copper ores Download PDF

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CN101781705A
CN101781705A CN201010124109A CN201010124109A CN101781705A CN 101781705 A CN101781705 A CN 101781705A CN 201010124109 A CN201010124109 A CN 201010124109A CN 201010124109 A CN201010124109 A CN 201010124109A CN 101781705 A CN101781705 A CN 101781705A
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leaching
earthy
ore deposit
microorganism
heap
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CN101781705B (en
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王鼎
王宣明
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Abstract

The invention relates to a method for leaching earthy oxide copper ores, in particular to a method for microorganism-pelleting heap leaching, and belongs to the technical field of hydrometallurgy. The method is characterized in that: the earthy ores are directly screened, and fine ores with the granularity of 1.5mm are added with strain acid water and cement to prepare ore pellets with the diameter between 10 and 20 mm for heap leaching, wherein the mass concentration of sulphuric acid in the strain acid water is 3 to 10 percent, strains are mixed strains of Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirillum ferrooxidans, the mass ratio of the three is 4.0-5.5:2.5-3.5:1.5-2.5, the bacterial load ratio is 105 and 108/ml, the cement amount is 15 to 30kg/ton of ores; and leachate in the leaching is sprayed for closed cycle production. The method has the advantages of low investment, low energy consumption, good leaching effect, and no discharge of closed cycle, solves the problem of leaching the low-grade earthy oxide copper ores (including sulphide and oxide blend ores) by microorganism heap leaching, and overcomes the defects of long flow and high cost of agitation leaching.

Description

Method for microorganism-pelleting heap leaching of earthy oxide copper ores
Technical field
The present invention relates to a kind of leaching method of copper earthy oxidized ore, particularly the method for microorganism system ball dump leaching belongs to technical field of wet metallurgy.
Background technology
In the mineral of copper, surface layer exists rate of decay height, granularity than a kind of ore body---the earthy copper oxide ore of subclass like soil, general granularity partly accounts for overall more than 80% less than 1mm, containing copper grade does not wait 0.1%～1.2%, average grade is about 0.6%, contain inertia copper and, belong to the class ore that grade is low, difficult, tooling cost is high in conjunction with copper.Because fine size, penetrating quality are poor, are different from block oxidized ore, thereby should not directly carry out the dump leaching operation.So handling the technology that this class ore adopted at present is the technology of agitation leach, also have and adopt the trial of adding microorganism when stirring, leach back regeneration electrogenesis copper.Existing this class technology exists long flow path, shortcoming that cost is high.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method for microorganism-pelleting heap leaching of earthy oxide copper ores, has the production efficiency height, and leaching effect is good, and is energy-conservation, invests advantages such as low, that environmental benefit is good.
Solving the scheme that technical problem of the present invention adopts is:
Direct earthy jig branch, the following thin ore deposit of granularity 1.5mm adds the bacterium sour water and cement is made diameter 10mm～20mm ore deposit ball dump leaching, h 2 so 4 concentration 3%～10% in " bacterium sour water ", bacterial classification is thiobacillus ferrooxidant (T f), thiobacillus thiooxidans (T t) and iron protoxide hook end Helicobacter pylori (L f) mixed bacterium, three's mass ratio 4.0～5.5: 2.5～3.5: 1.5～2.5, amount of bacteria is than 10 5～10 8Individual/ml, cement amount 15～30kg/ ton ore deposit, the leach liquor closed cycle during spray leaches is produced.
Above-mentioned system ball dump leaching of the present invention, also can parameter basis by above technical scheme on, take in thin ore deposit, to add cement and the mixed ball of sulfuric acid liquid earlier, leach with bacterium sour water spray again, the pH value of " bacterium sour water " is 1.5～2.0.
Concrete technical scheme of the present invention also comprises:
The production of mixed bacterium is to ooze the groove domestication by filter to cultivate, amplify and expanding propagation by the darkroom, the application of after the domestication breeding, putting into production again, thus the domestication of bacterial classification and breeding circular integration are finished, but and in domestication nutrient solution such as flexible Application 9K, satisfy " bacterium sour water " demand in spray.
The temperature of system ore deposit ball is 2～4 ℃, moisture 25～the 30wt% of the spherolite of making builds the ore deposit ball acidifying or the slaking of heap and leaches after 2～3 days, builds dump leaching and go out under moisture state, build and insert permeability cell nature bubbling air in the ore deposit ball of heap, or be communicated with the additional air of permeability cell with the air compressor machine of 0.5MPa.
When building heap ore deposit ball, the earthy jig can be divided granularity to lay 30～50mm at the rough grain of 15～20mm, as the surface layer of ore deposit ball dump leaching, the intensity that spray leaches is 12～16L/m 2H, 2～April of extraction time.
The invention has the beneficial effects as follows:
Adopt the method treatment capacity of dump leaching to improve greatly, reduced washup, stirring, concentrate, a series of programs such as heavy clear, filter residue, filter residue, construction mine tailing storehouse, saved this partly investment cost, reduced labour cost and electricity charge or the like.
And microorganism system ball leaching-out technique has characteristics such as investment is low, environmental benefit is good; ooze the application in groove and darkroom by filter; make the domestication of mixt bacteria and breed integrated finishing; satisfied the large-scale production demand, more can the suit leaching of unmanageable copper earthy oxidized ore or other mineral of the use of mixt bacteria.The present invention compares with other relevant art, select smelting efficient high more than 20% than conventional, be about 50% as earthy oxidized ore agitation leach rate, wherein failed to understand that in conjunction with copper, inertia copper, quilt the copper of thing parcel is seldom leached, and can be improved the leaching effect more than 20% after the dump leaching of the microorganism system of use ball.Leach liquor can pass through extraction, back extraction, electrolytic copper that the electrodeposition output is qualified, and copper sponge that also can direct production cupric 90～94% will cut down the consumption of energy greatly, and energy-saving and emission-reduction are made a significant contribution.
In the copper resource of China, development and use are backward state to the earthy oxidized ore of copper, adopt microorganism granulating and heap-leaching of the present invention, ooze groove and integrated realization will be tamed and breed in the darkroom with filter, copper is already produced will be played raising and pushing effect.
Embodiment
Embodiment 1: at certain low-grade earthy oxidized ore is main mine, carries out the microorganism granulating and heap-leaching, and composition of ores is shown in Table 1.Process system is levelling of the land, the gradient 3%, remove sharp stone foreign material after, the protection layer of sand of laying depth 20cm, shop 1.5mm is soft to mould the covering antiseepage, repaves the thick 20cm of ore in sand form that local water is broken through, and arranges the porous tracheaes by 3 meters spacings, and UNICOM's air compressor machine.2 meters of seam thicknesses, raw ore are through the trommel screen classification, and the thin ore deposit of 80%＜1mm enters agitator, are blended into the bacterium sour water that contains sour 60g/L, thiobacillus ferrooxidant (T f), thiobacillus thiooxidans (T t) and iron protoxide hook end Helicobacter pylori (L f) the mixed bacterium mass ratio be 5: 3: 2, add gross weight 2% cement again, under the condition of total water ratio 28%～30%, apparatus for making pearl ball is made the bead fortune of diameter 15mm and is gone to pile, air compressor machine is with pressure, the 2.8M of 0.5MPa 3The flow velocity bubbling air of/min, per 8 hours once, each 3～5 minutes, begins spray after the slaking in 2 days.Sprinkler spacing 2.5 * 2.5M.Drench speed and be no more than 16L/m 2H is for well.Mixed strains adopts the percolation tank domestication, adds 9/2K culture accelerates multiplication in domestication, and breeding is amplified through the darkroom, running circulation domestication.90 days leaching yields reach 70.88%, leach liquor 3.05g/L pumps in the abstraction pool of original electrodeposition workshop, produce electro deposited copper.Raffinate is used for spray.
Table 1-1: mineral element analysis
Element ??Al 2O 3 ??SiO 2 ??Fe 2O 3 ??CaO ??MgO
Content wt% ??9.56 ??71.62 ??11.02 ??3.74 ??0.21
Table 1-2: material phase analysis
State Project Full copper In conjunction with copper Free copper Cupric sulfide Inertia copper Total copper
Thin ore deposit Grade occupation rate (wt%) ??0.76 ??0.166～??23.4 ??0.244～??34.37 ??0.11～??14.1 ??～28.17 ??0.71～??100
Table 1-3: copper leaching rate
Time d ??6 ??17 ??33 ??54 ??60 ??80 ??85
Cu leaching yield (wt%) ??6.90 ??29.26 ??57.58 ??67.73 ??69.81 ??73.19 ??75.52
Embodiment 2: after certain factory adopted the washing classification to above-mentioned earthy oxidized ore, (granularity 160 orders～1mm) employing content was the sulfuric acid agitation leach of 40～45g/L to thin ore deposit part.Raw ore average grade 0.7%, leach the back press filtration lose quarrel copper grade be 0.54%, oxidation ratio reality through checking local earthy oxidized ore is not high, 40% thin ore deposit≤160 orders, oxidation ratio 51%, sulfuration rate 49%, 45% thin ore deposit is arranged in addition less than 1.5mm, oxidation ratio 53%, sulfuration rate 47%, therefore filter quarrel grade is high.
The filter quarrel of above-mentioned cupric 0.54% is used for the microorganism granulating and heap-leaching, spherolite diameter 20mm, the stockyard gradient 6%, the soft covering antiseep of moulding of laying 1.5mm behind the smooth removing foreign material.The bacterium sour water contains sour be 30g/L, bacteria containing amount 10 during the system ball 7Individual/ml, mixed strains is than being (T f): (T t): (L f) being about 4: 2: 4, cement consumption is 2.5%, and slaking was built heap after 48 hours, piled highly 4.2 meters, built when heap and inserted high 4.2m by 2 * 2 spacing, and (5～10cm opens breather hole, natural permeable to the plastics permeability cell of diameter of phi 32 at interval.When adorning the ore deposit ball that the rough grain below the granularity 20mm that sieves out is rebasing, thickness is 4～5mm.Lay the following rough grain of the second layer granularity 20mm when ore deposit ball installs to 2m, thickness also is 4～5mm.When installing to 4.2m, the rough grain of shop granularity 15～20mm is surface layer (this layer is as the bottom in next dump leaching cycle), and thickness is 4～5mm, spray pickling intensity 12L/m 2H leached 120 days.Leaching yield can reach 62.5%, and leach liquor is produced electro deposited copper through extraction, back extraction, and the raffinate that contains acid 8～7g/L recycles.
Embodiment 3: adopt in copper mine block pit in somewhere, and the ore deposit of grade 0.32～0.73% accounts for total reserves 1/4, and thickness 10～15m, wide 200～500m can account for 3/4 of total reserves by opencast earthy oxidized ore.By ultimate analysis and material phase analysis, see Table 2.Needn't build agitation leach factory when founding the factory, and adopt the bacteria heap leaching method to leach.Sulfuric acid concentration 100g/L in the bacterium sour water that the system ball is used, bacteria containing amount is 10 5～10 7Individual/ml, (T f), (T t) and (L f) ratio be 5.5: 2.5: 2, cement consumption is 1.5% (wt) during mixed preparing, makes the spherolite that particle diameter 10～20mm differs in size, and carries out post after loading in mixture and soaks, and drips pouring speed 14L/m 2H drips and drenched 100 days,
Leaching yield reaches 81.14%.
Table 2-1: ultimate analysis
Element ??Al 2O 3 ??SiO 2 ??Fe 2O 3 ??CaO ??MgO
Content wt% ??11.76 ??52.32 ??16.74 ??3.74 ??8.95
Table 2-2: material phase analysis
State Project Full copper In conjunction with copper Free copper Cupric sulfide Inertia copper Total copper
Thin ore deposit Grade occupation rate (wt%) ??0.42 ??0.13～??18.72 ??0.298～??41.24 ??0.09～??11.28 ??～28.8 ??0.40～??100
Table 2-3: copper leaching rate
Time d ??6 ??20 ??35 ??60 ??80 ??100
Cu leaching yield (wt%) ??11.17 ??38.24 ??66.73 ??73.20 ??78.42 ??81.14
Embodiment 4: with the earthy oxidized ore screening of embodiment 3, the diluted acid of the mining sulfuric acid content 100g/L that granularity 1.5mm is following and the cement system goalpost of 1.5wt% are soaked.Add mixed bacterium in the pouring dropping liquid, ratio is T f: T t: L f=5.5: 2.5: 2, drenching speed was 14L/m 2H leaches and the results are shown in Table 2-4.
Table 2-4: copper leaching rate
Time d ??6 ??20 ??35 ??60 ??80 ??100 ??180
Cu leaching yield (wt%) ??11.5 ??37.82 ??46.22 ??49.17 ??54.40 ??60.25 ??80.72
Can think thus: carry out the bacterium leaching on the adding bacterium after making spherolite,, save time not as " bacterium sour water " directly makes spherolite, but the final effect difference is little from leaching the used time.The benefit of time and enterprise is closely related, so process selecting of the present invention serves as better to add bacterium system spherolite.

Claims (5)

1. method for microorganism-pelleting heap leaching of earthy oxide copper ores, it is characterized in that: directly sieve in the earthy ore deposit, the thin ore deposit of granularity 1.5mm adds the bacterium sour water and cement is made diameter 10mm～20mm ore deposit ball dump leaching, h 2 so 4 concentration 3%～10% in the bacterium sour water, bacterial classification is the mixed bacterium of thiobacillus ferrooxidant, thiobacillus thiooxidans and iron protoxide hook end Helicobacter pylori, three's mass ratio 4.0～5.5: 2.5～3.5: 1.5～2.5, amount of bacteria is than 10 5～10 8Individual/ml, cement amount 15～30kg/ ton ore deposit, the leach liquor closed cycle during spray leaches is produced.
2. method for microorganism-pelleting heap leaching of earthy oxide copper ores, it is characterized in that: directly sieve in the earthy ore deposit, add cement by 15～30kg/ ton ore deposit, sulfuric acid liquid with mass concentration 3%～10% mixes, make diameter 10mm～20mm ore deposit ball dump leaching, leach with bacterium sour water spray, bacterial classification is the mixed bacterium of thiobacillus ferrooxidant, thiobacillus thiooxidans and iron protoxide hook end Helicobacter pylori, three's mass ratio 4.0～5.5: 2.5～3.5: 1.5～2.5, amount of bacteria is than 10 5～10 8Individual/ml, pH value 1.5～2.0.
3. by claim 1 or 2 described method for microorganism-pelleting heap leaching of earthy oxide copper ores, it is characterized in that: the production of mixed bacterium is to ooze the groove domestication by filter to cultivate, and is amplified and expanding propagation the application of putting into production after the domestication breeding again by the darkroom.
4. by claim 1 or 2 described method for microorganism-pelleting heap leaching of earthy oxide copper ores, it is characterized in that: the temperature of system ore deposit ball is 2～4 ℃, moisture 25～the 30wt% of the spherolite of making, building the ore deposit ball acidifying or the slaking of heap leached after 2～3 days, build and insert permeability cell nature bubbling air in the ore deposit ball of heap, or be communicated with the additional air of permeability cell with the air compressor machine of 0.5MPa.
5. by claim 1 or 2 described method for microorganism-pelleting heap leaching of earthy oxide copper ores, it is characterized in that: the rough grain of earthy jig point granularity 15～20mm is laid the surface layer of 30～50mm as ore deposit ball dump leaching, and the intensity that spray leaches is 12～16L/m 2H, 2～April of extraction time.
CN2010101241098A 2010-03-15 2010-03-15 Method for microorganism-pelleting heap leaching of earthy oxide copper ores Expired - Fee Related CN101781705B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012055167A1 (en) * 2010-10-31 2012-05-03 中南大学 Bacterial liquid of microbial combinations for biometallurgical leaching of copper ore and method for recovering metallic copper therefrom
CN104846196A (en) * 2015-02-04 2015-08-19 江西省科学院生物资源研究所 Process for improving leaching rate of copper in earthy copper deposit by using heat released by concentrated sulfuric acid
CN105112655A (en) * 2015-08-31 2015-12-02 江西省科学院生物资源研究所 Method for graded leaching of earthy high-binding-rate copper oxide ore
CN106062221A (en) * 2013-10-23 2016-10-26 Bhp智利股份有限公司 Heap leaching of copper
CN106381386A (en) * 2016-09-27 2017-02-08 中国铜业有限公司 Agitation-leaching treatment method for low-grade highly-mudded copper ores
CN108203760A (en) * 2016-12-19 2018-06-26 北京有色金属研究总院 A kind of granulation-biological dump leaching process suitable for low-grade oxygen-sulfur mixed copper ore
CN110029231A (en) * 2019-06-03 2019-07-19 东北大学 A kind of bacterial leaching way of the complex copper oxide ore containing a variety of copper minerals
CN110747351A (en) * 2019-10-31 2020-02-04 万宝矿产有限公司 Copper ore column leaching-extraction linkage test method

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CN1031860A (en) * 1987-07-10 1989-03-22 巨人湾生物科技有限公司 The chemical/biological process of oxidize multimetallic sulphide ores
CN1293259A (en) * 1999-09-15 2001-05-02 比利顿股份有限公司 Rocovery of copper and mickel
CN101033509A (en) * 2007-04-16 2007-09-12 中南大学 Bacteria underground heap leaching process for copper ore
CN101638720A (en) * 2009-05-22 2010-02-03 东北大学 Bacterial leaching copper method of complex chalcopyrite flotation tailings

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CN1031860A (en) * 1987-07-10 1989-03-22 巨人湾生物科技有限公司 The chemical/biological process of oxidize multimetallic sulphide ores
CN1293259A (en) * 1999-09-15 2001-05-02 比利顿股份有限公司 Rocovery of copper and mickel
CN101033509A (en) * 2007-04-16 2007-09-12 中南大学 Bacteria underground heap leaching process for copper ore
CN101638720A (en) * 2009-05-22 2010-02-03 东北大学 Bacterial leaching copper method of complex chalcopyrite flotation tailings

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012055167A1 (en) * 2010-10-31 2012-05-03 中南大学 Bacterial liquid of microbial combinations for biometallurgical leaching of copper ore and method for recovering metallic copper therefrom
CN106062221B (en) * 2013-10-23 2019-08-06 Bhp智利股份有限公司 The dump leaching of copper
CN106062221A (en) * 2013-10-23 2016-10-26 Bhp智利股份有限公司 Heap leaching of copper
CN104846196B (en) * 2015-02-04 2018-07-13 江西省科学院生物资源研究所 A kind of technique improving Earthy copper resources copper leaching rate using concentrated sulfuric acid heat release
CN104846196A (en) * 2015-02-04 2015-08-19 江西省科学院生物资源研究所 Process for improving leaching rate of copper in earthy copper deposit by using heat released by concentrated sulfuric acid
CN105112655A (en) * 2015-08-31 2015-12-02 江西省科学院生物资源研究所 Method for graded leaching of earthy high-binding-rate copper oxide ore
CN106381386A (en) * 2016-09-27 2017-02-08 中国铜业有限公司 Agitation-leaching treatment method for low-grade highly-mudded copper ores
CN106381386B (en) * 2016-09-27 2018-12-25 章梦涛 A kind of leaching processing method of low-grade high shale content copper mine
CN108203760A (en) * 2016-12-19 2018-06-26 北京有色金属研究总院 A kind of granulation-biological dump leaching process suitable for low-grade oxygen-sulfur mixed copper ore
CN108203760B (en) * 2016-12-19 2020-02-07 有研工程技术研究院有限公司 Granulation-biological heap leaching process suitable for low-grade oxygen-sulfur mixed copper ore
CN110029231A (en) * 2019-06-03 2019-07-19 东北大学 A kind of bacterial leaching way of the complex copper oxide ore containing a variety of copper minerals
CN110029231B (en) * 2019-06-03 2021-11-16 东北大学 Bacterial leaching method of complex copper oxide ore containing multiple copper minerals
CN110747351A (en) * 2019-10-31 2020-02-04 万宝矿产有限公司 Copper ore column leaching-extraction linkage test method

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