CN102251109B - Antifreezing method for bioleaching ore heap of sulphide ore - Google Patents
Antifreezing method for bioleaching ore heap of sulphide ore Download PDFInfo
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- CN102251109B CN102251109B CN2011101896893A CN201110189689A CN102251109B CN 102251109 B CN102251109 B CN 102251109B CN 2011101896893 A CN2011101896893 A CN 2011101896893A CN 201110189689 A CN201110189689 A CN 201110189689A CN 102251109 B CN102251109 B CN 102251109B
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Abstract
The invention relates to a sulfide ore bioleaching ore heap technology, and particularly discloses an antifreezing method for a sulfide ore bioleaching ore heap, which improves the bacterial concentration of bioleaching liquid by adding bacterial oxidation exothermic materials into ores, and realizes the artificial control of the exothermic quantity in the ore heap; laying a heat insulation material and a breathable heat absorption material on the surface of the ore heap to reduce heat loss of the ore heap and absorb solar heat energy; finally, the temperature influence of the leaching liquid on the ore heap is reduced through the auxiliary heating pipeline and the flow control of the leaching liquid of the ore heap; after being controlled by each link, the temperature change in the ore heap can be artificially controlled according to the surface environment temperature, and the influence of the external environment temperature on the biological leaching process is reduced or avoided. The application of the technology can ensure that the biological heap leaching technology can be applied in alpine regions, and improve the biological heap leaching efficiency in winter or under low temperature conditions.
Description
Technical field
The present invention relates to the sulfide ore bioleaching ore heap technical field, in particular, is the means to prevent freezing for the sulfide ore bioleaching ore heap of low temperature season, extremely frigid zones.
Background technology
Biological dump leaching is a kind of of stacking leaching mining method, it refers to and will contain the solution spraying of microorganism on ore storage, make the selective oxidation solvency action or the Chemical Leaching effect that utilize microorganism in the diafiltration process of solution in ore storage change the valuable constituent in the ore over to solution, so that a kind of method of further extracting or reclaim.The biological dump leaching method is owing to having the characteristics such as technical process is short, environment is good, equipment is simple, flexible, comprehensive utilization for complexity, many metals, low grade ore, barren rock has advantage, now obtaining widespread use aspect the METAL EXTRACTION such as copper, gold, nickel, cobalt, especially in the processing of secondary copper sulfide mineral.
The core content of biological dump leaching technology is that microbial growth breeding and microorganism are to the selective oxidation dissolving of sulfide mineral in the ore.The microorganism that existing domestic and international biological dump leaching technology is used mainly is: 1) mesophilic acidophilic bacteria (with
Acidthiobacillus ferrooxidansWith
Acidthiobacillus thiooxidansTwo class ore-leaching bacterias are representative), 2) the moderate thermophile acidophilic bacteria (with
Sulfobacillum thermosulfidooxidanWith
Leptospirillums thermoferrooxidansBe representative), 3) the only a few stockyard adopt extreme thermoacidophile (with
Acidianus brierleyiWith
Sulfolobus metallicusBe representative).All there is the optimum growth temperature scope in this three bacterioid, and the optimum growth temperature scope of mesophilic acidophilic bacteria is 25-35 ℃, the moderate thermophile acidophilic bacteria be 45-55 ℃, extreme thermoacidophile then is 60-80 ℃.
In the prior art, its growth and breeding and the oxidation behavior of sulfide slackened rapidly when envrionment temperature is lower than the optimum growth temperature scope of above-mentioned bacterium, even stop growing so a large amount of bacterium dead.This shows, carry out the anti-freezing and heat-insulating work of bioleaching ore deposit heap at low temperature season especially extremely frigid zones, temperature regulation in the heap of ore deposit is to suitable temperature range, significant to bacterial growth and oxidation activity in the guarantee heap.
Summary of the invention
The present invention proposes a kind of means to prevent freezing of sulfide ore bioleaching ore heap, especially the associated problem that the ore deposit stack temperature is low and Yin Wendu causes that exist in the extremely frigid zones sulphide ores biological heap leaching process to solve low temperature season, ensure ore deposit heap bioleaching process continue carry out.
The means to prevent freezing of sulfide ore bioleaching ore heap is characterized in that following processing step:
A, mix according to ore properties interpolation bio-oxidation exothermic ingredient before entering heap;
B, the ore after the processing of step A is built one or more ore deposits heap;
C, lay lagging material and heat-sink material on heap surface, ore deposit;
D, the ore deposit heap spray biochemical lixivium of processing through step C is carried out inoculated bacteria obtain leach liquor; Described biochemical lixivium is through being transferred spray after the bacterium amplification culture again, and biochemical lixivium also is heated insulation during conveying;
E, leach liquor through extracting and separating, obtain metal and raffinate after the ore deposit heap is got rid of, metal reclaims, and raffinate adds the bacterium amplification culture recycle that bacteriotrophy liquid is used for step D;
F, adjustment ore deposit heap drip and drench or a spray system.
Ore in the steps A is at first through pulverization process, and the granularity of ore grinding is generally 0--50mm(and is not equal to 0mm) in.Ore after the pulverizing is sent to mixed ore deposit step so that adding the bio-oxidation exothermic ingredient mixes, and then will mix ore after process in the ore deposit and be sent to and be used for heap on conveyer or the automobile and build one or more ore deposits heap.
The exothermic ingredient of bio-oxidation described in the steps A is pyritic ashes or sulphur powder, and the pyritic ashes of interpolation or sulphur powder are the 1-2% of ore total mass.
Before step B builds heap, need well in advance stockyard heelpiece, heelpiece can adopt clay and high polymerization material to make waterproof membrane, be equipped with liquid trap and gas-filled valve below the waterproof membrane, liquid trap is connected in the hydrops pond, infusion solution by the ore deposit heap can be collected into the hydrops pond like this, avoid the infusion solution loss, collect the infusion solution that obtains and also can be used for follow-up biological dump leaching use.
Also adopt than raw ore in liquid trap and gas-filled valve outside and to be laid to easy filter layer, the buried protection of liquid trap and gas-filled valve.
After the ore deposit heap is built, drip and drench or sprinkling equipment in the even laying of out-pile table (comprising heap top and side), use for follow-up acid adding or inoculated bacteria.
Among the step C, the described laying on heap surface, ore deposit refers to that heap top and the side piled in the ore deposit cover the one layer of heat preservation material, then cover one deck heat-sink material again at the lagging material skin.
Described lagging material can adopt straw, straw etc. to form through the cutting lace, and thickness is: 50-150mm; Described heat-sink material is for the high polymer plastic film of ventilative heat absorption, such as PVC, PE plastic film etc.
So ore deposit heap not only can reduce heat loss, and can to take full advantage of sunlight be ore deposit heap heating.
Heat tracing described in the step D is by adiabator layer being set carrying biochemical lixivium to be delivered to the transport pipe outer wall that the ore deposit heap sprays, the outer wall of adiabator layer arranges the boosting layer, and adiabator layer and boosting layer are all be used to preventing that leach liquor is excessively cold.
Described adiabator layer is insulation foam plate, and the boosting layer is the low-temperature heat band, and the low-temperature heat band is wrapped on the transport pipe outer wall, and insulation foam plate is with transport pipe and low-temperature heat band parcel; Described low-temperature heat band is automatic temperature-controlled heat tracing cable.
Biochemical lixivium is sprayed before ore deposit heap, need carry out the bacterium amplification culture (namely by add bacteriotrophy liquid create conditions allow the bacterium Fast-propagation) to improve bacterial concentration in the biochemical lixivium, strengthen bacterium to the oxidation heat liberation effect of sulphide ores in the heap of ore deposit.
The liquid of bacteriotrophy described in the step e comprises: (NH
4)
2SO
41.5g/L, KCl 0.1g/L, K
2HPO
40.2g/L, MgSO
47H2O 0.5g/L, Ca (NO
3)
20.01g/L, 10g/L pyrite powder.
Pouring is dripped in the described adjustment of final step F or the spray system refers to drip pouring or spray flux according to ore deposit stack temperature adjustment, then reduces the jet flow amount when temperature is on the low side, then increases the jet flow amount when temperature drift, and then reduces leach liquor to the impact of ore deposit stack temperature.
So by reinforcement and the control of a plurality of links, reduce scattering and disappearing or running off of ore deposit heap heat, increase ore deposit heap thermal value, the temperature of ore deposit heap can be controlled in the suitable growth scope of ore-leaching bacteria, and then ensure that bacterium is to the oxidation dissolution speed of purpose mineral in the heap of ore deposit.
Beneficial effect of the present invention is as follows:
The present invention utilizes the exothermicity of sulphide ores bacterial oxidation process, by adding the bacterial oxidation exothermic ingredient of suitable proportion, improves bacterial concentration, the thermal discharge in the heap of manual control ore deposit; Lay lagging material and ventilative heat-sink material on heap surface, ore deposit, reduce ore deposit heap heat leakage, absorb solar thermal energy; By boosting pipeline and the flow control of ore deposit dump leaching fluid, reduce leach liquor to the temperature effect of ore deposit heap at last; After above-mentioned each link control, can be according to the temperature variation in the heap of appearance envrionment temperature manual control ore deposit, reduce or avoid ambient temperature on the impact of bioleaching process; The application of this technology will so that the biological dump leaching technology can be used at extremely frigid zones, improve biological dump leaching efficient under winter or the cold condition.
Description of drawings
Fig. 1 is antifreeze schematic flow sheet of the present invention
Fig. 2 is the structural representation for biochemical lixivium being delivered to the transport pipe that ore deposit heap sprays of the present invention
Wherein, A is the low-temperature heat band, and B is insulation foam plate, and C is the leach liquor transport pipe.
Embodiment
As shown in Figure 1, the means to prevent freezing of sulfide ore bioleaching ore heap:
At first press known method exploitated ore 1, and deliver to fragmentation procedure flow process 2, ore is crushed to predetermined particle size in crushing circuit, is generally 0--50mm(and is not equal to 0mm) in.
Broken good ore is transported in the rotating cylinder, be the dilute sulphuric acid wetting 3 of 0.1-1.0mol/L through over-richness, and the bio-oxidation exothermic ingredient of mixed ore total mass 1-2%, its detailed process is that ore is along with rotating cylinder rolls, in rolling process, add the bio-oxidation exothermic ingredient, and have shower nozzle constantly dilute sulphuric acid to be sprayed to mineral surface, most of fine ore will be attached to the raw ore particle surface after dilute sulphuric acid is wetting or spontaneous bonding is agglomerating.Being sent to after ore is processed through rotating cylinder that the stockyard builds according to the currently known methods heap is single or multiple ore deposits heaps.
As everyone knows, before building heap, need first smooth stockyard and guarantee certain inclination angle, need to adopt clay and high polymerization material to do waterproof layer after heelpiece prepares on request and process, to reduce or to avoid the leach liquor loss.The preparation of heelpiece also is included in lays liquid trap road and gas ducting on the waterproof layer, and with thicker ore the burying pipeline on the heelpiece is protected.After an ore deposit heap is built, need to evenly lay to drip at ore deposit out-pile table (comprising heap top and side) and drench or sprinkling equipment.
According to the above, after ore deposit heap 4 sets fully, the regular straw that lagging material 5(cutting is woven into, straw etc.) be laid on heap surface, ore deposit, covering the high polymer plastic film 6(PVC of the ventilative heat absorption of one decks, PE plastic film etc. at lagging material 5).
Behind the everything in readiness, inoculated bacteria drips and drenches or the spray operation.Biochemical lixivium at first through bacterium amplification culture 10, then enters the stockyard through transport pipe 12 before entering the ore deposit heap, the transport pipe structure as shown in Figure 2.
Described transport pipe C outer wall arranges adiabator layer, and the outer wall of adiabator layer arranges the boosting layer, and adiabator layer and boosting layer are all be used to preventing that leach liquor is excessively cold.
Described adiabator layer is insulation foam plate, and the boosting layer is the low-temperature heat band, and low-temperature heat band A is wrapped on the transport pipe C outer wall, and insulation foam plate B is with transport pipe C and low-temperature heat band A parcel; Described low-temperature heat band A is automatic temperature-controlled heat tracing cable.
Leach liquor enters hydrops pond 7 after ore deposit heap is got rid of, by extraction separation device 8 with the metal separation in the leach liquor, enter metals recovery processes flow process 9.Raffinate enters bacterium amplification culture device 10, again enters the ore deposit heap by transport pipe 12 after amplification culture under the environment that adds bacteriotrophy liquid.
Described bacteriotrophy liquid comprises: (NH
4)
2SO
41.5g/L, KCl 0.1g/L, K
2HPO
40.2g/L, MgSO
47H2O 0.5g/L, Ca (NO
3)
20.01g/L, 10g/L pyrite powder.
As above narrate, in ore deposit heap, one or more temp probes are set, monitoring ore deposit stack temperature changing condition, and drip the exothermic ingredient ratio that pouring or spray flux, adjustment are added according to ore deposit stack temperature change condition, or the nutrient concentrations in the bacterium amplification culture.Undoubtedly, this technology is piled applicable to a plurality of ore deposits, and workable.
Claims (7)
1. the means to prevent freezing of sulfide ore bioleaching ore heap is characterized in that following processing step:
A, mix according to ore properties interpolation bio-oxidation exothermic ingredient before entering heap;
B, the ore after the processing of step A is built one or more ore deposits heap;
C, lay lagging material and heat-sink material on heap surface, ore deposit;
D, the ore deposit heap spray biochemical lixivium of processing through step C is carried out inoculated bacteria obtain leach liquor; Described biochemical lixivium is through being transferred spray after the bacterium amplification culture again, and biochemical lixivium also is heated insulation during conveying;
E, leach liquor through extracting and separating, obtain metal and raffinate after the ore deposit heap is got rid of, metal reclaims, and raffinate adds the bacterium amplification culture recycle that bacteriotrophy liquid is used for step D;
F, adjustment ore deposit heap drip and drench or a spray system;
Bio-oxidation exothermic ingredient described in the described steps A is pyritic ashes or sulphur powder, and the pyritic ashes of interpolation or sulphur powder are the 1-2% of ore total mass; Described heat-sink material is the high polymer plastic film of ventilative heat absorption; Described lagging material adopts straw, straw to form through the cutting lace, and thickness is: 50-150mm.
2. means to prevent freezing according to claim 1, it is characterized in that: the ore in the steps A is at first through pulverization process, and the grinding particle size of ore is in the 0-50mm, but is not equal to 0mm.
3. the described means to prevent freezing of any one according to claim 1-2 is characterized in that: among the step C, then described heap top and the side covering one layer of heat preservation material that refers at the ore deposit heap of laying on heap surface, ore deposit cover one deck heat-sink material again at the lagging material skin.
4. means to prevent freezing according to claim 1, it is characterized in that: the heat tracing described in the step D is by adiabator layer being set carrying biochemical lixivium to be delivered to the transport pipe outer wall that the ore deposit heap sprays, the outer wall of adiabator layer arranges the boosting layer, and adiabator layer and boosting layer are all be used to preventing that leach liquor is excessively cold.
5. means to prevent freezing according to claim 4, it is characterized in that: described adiabator layer is insulation foam plate, the boosting layer is the low-temperature heat band, and the low-temperature heat band is wrapped on the transport pipe outer wall, and insulation foam plate is with transport pipe and low-temperature heat band parcel; Described low-temperature heat band is automatic temperature-controlled heat tracing cable.
6. means to prevent freezing according to claim 1 or 5, it is characterized in that: the liquid of bacteriotrophy described in the step e comprises: (NH
4)
2SO
41.5g/L, KCl 0.1g/L, K
2HPO
40.2g/L, MgSO
47H
2O 0.5g/L, Ca (NO
3)
20.01g/L, 10g/L pyrite powder.
7. means to prevent freezing according to claim 1 is characterized in that: the described adjustment of step F is dripped and is drenched or the spray system refers to drip according to ore deposit stack temperature adjustment and drenches or spray flux, then reduces the jet flow amount when temperature is on the low side, then increases the jet flow amount when temperature drift.
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|---|---|---|---|
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| CN103397181B (en) * | 2013-08-07 | 2015-03-04 | 中国地质科学院矿产综合利用研究所 | Recovery process of associated metal elements in iron ore |
| CN103667696A (en) * | 2013-12-22 | 2014-03-26 | 广西南宁胜祺安科技开发有限公司 | Method for biologically extracting metal from metallurgical and mine solid wastes |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101434918A (en) * | 2007-11-13 | 2009-05-20 | 北京有色金属研究总院 | Leaching-ore bacteria and high temperature heap bioleaching process for chalcopyrite ore by using the same |
| CN101558176A (en) * | 2006-10-13 | 2009-10-14 | Bhp比尔顿有限公司 | Accelerated heat generation in heap bioleaching |
| CN101855374A (en) * | 2007-10-31 | 2010-10-06 | Bhp比尔顿有限公司 | High temperature leaching process |
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| US6802888B2 (en) * | 1998-12-14 | 2004-10-12 | Geobiotics, Llc | High temperature heap bioleaching process |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101558176A (en) * | 2006-10-13 | 2009-10-14 | Bhp比尔顿有限公司 | Accelerated heat generation in heap bioleaching |
| CN101855374A (en) * | 2007-10-31 | 2010-10-06 | Bhp比尔顿有限公司 | High temperature leaching process |
| CN101434918A (en) * | 2007-11-13 | 2009-05-20 | 北京有色金属研究总院 | Leaching-ore bacteria and high temperature heap bioleaching process for chalcopyrite ore by using the same |
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