CN1304608C - Refuse-dump pipe injection leaching-out method - Google Patents
Refuse-dump pipe injection leaching-out method Download PDFInfo
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- CN1304608C CN1304608C CNB2005100324247A CN200510032424A CN1304608C CN 1304608 C CN1304608 C CN 1304608C CN B2005100324247 A CNB2005100324247 A CN B2005100324247A CN 200510032424 A CN200510032424 A CN 200510032424A CN 1304608 C CN1304608 C CN 1304608C
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- heap
- liquid
- leaching
- solution
- hole
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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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Abstract
The present invention relates to a pipe injection leaching method for dumping sites. A dumping site is divided into mining districts with areas between 100*100 and 500*500 m<2> according to the thickness of the dumping site. Leaching solution is adopted in each of the mining districts for leaching, and a combined leaching solution distributing mode of solution distribution on a heap top and solution distribution in a heap is adopted, wherein the coverage area of solution distribution on a heap top is 0 to 30% of the total area, and the coverage area of solution distribution in a heap is 70 to 100% of the total area. Leached solution is collected through the combination of solution collecting reservoirs and drill holes in a heap, the solution collecting reservoirs 4 are used for collecting leached solution on side slopes, and the drill holes 2 are used for collecting leached solution in the heap. The method of the present invention is adopted, the leaching concentration can be increased by one to two times, the productivity is enhanced by three times, the production period is shortened by 45%, and the leaching rate is increased by 80%. The method of the present invention improves the leaching operation state of a dumping site and decreases the accident rate of side slope slide during the leaching process.
Description
Technical field the present invention relates to a kind of mine refuse dump dump leaching mining technique.
Background technology is according to the preparatory condition difference before leaching, and face of land dump leaching mining codes are divided into to be built dump leaching and go out with non-to build dump leaching and go out.Building dump leaching, to go out technology quite ripe, is example with the copper mine, at first is used for copper oxide ore and leaches, and expands copper-sulphide ores afterwards to.Non-what build that dump leaching go out to handle is the following barren rock of cut-off grade, because grade is lower, builds heap and is difficult to profit, can only leach by direct cloth liquid in the refuse dump.
Present domestic copper mine dump leaching mainly is to take to implement measures such as side slope spray, employing leisure operation system, reasonable control hierarchy height, but still exist problems such as penetrating quality is poor, leaching yield is low, leach liquor concentration is low, bacterial activity difference, reach 8% as certain copper mine dump leaching factory year leaching yield, leach liquor 0.3～0.45g/L, yearly capacity has only 1/3 of designed capacity, directly has influence on dump leaching method applying in large-scale refuse dump.Silt content height, heap top surface compactness cause the leaching solution circulation not smooth greatly in the heap of refuse dump, ore grade is low, particle diameter is big, waste height is thick causes greatly that leach liquor concentration is little, to leach recoverys degree low, the interior quick breeding that ventilation property is poor, range of temperature has influence on bacterium greatly of heap.
Summary of the invention the purpose of this invention is to provide a kind of refuse-dump pipe injection leaching-out method, this method is by improving ore deposit heap internal penetration, improve oxygen supply situation in the heap of ore deposit, stack temperature control dynamics is soaked in increasing, shortening leaching cycle, to improve leaching yield, thereby optimize leaching effect, increase economic efficiency.
Refuse-dump pipe injection leaching-out method is divided the exploiting field according to a soil thickness with the refuse dump, and the exploiting field area is at 100 * 100～500 * 500m
2Between, adopt leaching solution to implement to leach to each exploiting field, leaching solution adopts heap top cloth liquid and the interior cloth liquid phase bonded associating of heap cloth liquid form, wherein piling top cloth liquid coverage is 0～30% of the total area, cloth liquid accounts for 70～100% in the heap, and leach liquor is by collecting tank and heap internal drilling combination collection, and collecting tank 4 is collected the side slope leach liquor, leach liquor in the heap is collected in boring 2, as shown in Figure 1.
In order to prevent leach liquor, construct seepage proof curtain 6 around in the heap of refuse dump, constructing heelpiece and leaching the district to the exploiting field external diffusion.Is that 10～30% clay slurry is constructed and soaked the heap heelpiece in refuse dump bottom by liquid distributing hole and liquid-collecting hole implantation concentration, and heelpiece thickness is 1～5m.The curtain boring that be arranged in parallel around 5 in the exploiting field, pitch of holes is 20～30m; It is 10～20% liming that the leaching initial stage pours into concentration, makes it and H
2SO
4Form waterproof gypsic horizon; Under the higher prerequisite of clay content, in hole 7 water fillings and draw water in adjacent curtain boring 8 and to form the leakproof water curtain of curtain, as shown in Figure 2.
Described leaching solution is that solvent is that the pH value is 1.5～2.5 H
2SO
4Solution, bacterium is the chemoautotrophic bacteria after taming, bacterial concentration is 10
6～10
8Individual/ml, or be 20～30% ammoniacal liquor, and add (the NH of 2mol/L
4)
2CO
3, or (NH
4)
2SO
4, the pH value of solution value is 8～10.
Heap top cloth liquid adopts face of land spray or drips the pouring form, and spray thrower 3 net degree are (10～15) * (10～15) m
2, spray liquid intensity is 5～15L/m
2.h; Dripping pouring device net degree is (0.2～0.4) * (0.2～0.4) m
2, dripping and drenching intensity is 2～5L/m
2.h.Cloth liquid is implemented by the liquid distributing hole 1 that is arranged in the heap in the heap, and liquid distributing hole 1 aperture is 100～400mm, and hole depth is the heap body thickness, and the net degree of liquid distributing hole 1 is 10 * 10～50 * 50m
2
Also be provided with the liquid-collecting hole 2 that the aperture is 100～400mm in the heap of refuse dump, hole depth is the heap body thickness, and the net degree of liquid-collecting hole 2 is 10 * 10～50 * 50m
2Liquid distributing hole and liquid-collecting hole are staggered.Receive the liquid mode and adopt air-lift unit to extract leach liquor by liquid-collecting hole, the pumping pipe diameter is at 80～200mm, and tracheal diameter is 30～80mm, and gas consumption is 10～20m
3/ min, the drawing liquid amount is 20～50m
3/ h.
For improving ore deposit heap internal penetration, improve oxygen supply situation in the heap of ore deposit, inflate by 1 pair of ore deposit heap of liquid distributing hole.Air injection tube road 10 is installed in liquid distributing hole 1 bottom, at the end of injection tube 10 gas liquid mixer 11 is installed, gas as shown in Figure 3, forms a large amount of micro-bubbles 13 by air compressor machine 12 supplies in leaching solution 9.Gaseous tension is 0.6～0.8MPa, and flow is 0.1～10m
3/ s, total gas flow rate is 0.4～40 times of exploiting field volume during the leaching.
Summer, the leaching solution temperature was at 20～30 ℃, control leaching solution flow make cloth liquid intensity O.1～1.0m
3/ m
2.h between, most of heat is taken out of with leach liquor and is soaked heap in will piling, and makes to soak stack temperature and be controlled at below 40 ℃; Heat up leaching solution winter with sun power or industrial waste heat, and adopt the piping insulation measure, makes the leaching solution temperature between 20～25 ℃, and flow control is at 0.01～0.05m
3/ m
2.h, make and soak stack temperature and remain on more than 15 ℃.
Adopt the present invention, leach concentration and can improve 1～2 times, throughput increases 3 times, and the production cycle shortens 45%, and leaching yield rises 80%; The present invention improves the refuse dump and leaches management state, is reduced in leaching process slope and land slide casualty ratio of accidents, and its market potential is worth huge.
Description of drawings
Fig. 1. associating cloth liquid and receipts liquid mode diagrammatic cross-section, among the figure: → expression leaching solution flow direction;
Fig. 2. the seepage proof curtain synoptic diagram;
Fig. 3. artificial steam line diagrammatic cross-section.
Embodiment
Example 1: retired refuse dump.Retired refuse dump is leached facility and is once finished until the exploiting field leaching end of job.Heap top cloth liquid adopts spray or drips the pouring mode, and cloth (receipts) liquid adopts cloth (receipts) liquid hole in the heap, and pattern adopts quincunx, and promptly liquid distributing hole and liquid-collecting hole are arranged at interval, and boring net degree is (20～30) * (20～30) m
2, liquid distributing hole is identical with the liquid-collecting hole diameter, is 100～200mm, and liquid distributing hole and liquid-collecting hole regularly exchange.Construct heelpiece in the bottom, exploiting field, construct seepage proof curtain in the periphery, exploiting field, thickness is 1～5m.Inject leaching solution to liquid distributor, the earlier dense back of leaching solution concentration is rare, and leaching solution concentration is between 15～40g/L.Gas liquid mixer is arranged in the liquid distributing hole bottom, injects air by gas liquid mixer in the hole.Adopt the air-lift unit mode that leach liquor is evacuated to the face of land by liquid-collecting hole, flow to collecting tank again.Carry out shunting at the collecting tank leach liquor, qualifying liquid is sent to extraction treatment, and it is about 2.0 that defective liquid is adjusted the pH value, returns liquid distributing hole again.Temperature in the periodic monitoring heap is just adjusted the immersion liquid flow range according to temperature, and temperature is controlled in 15～40 ℃.Sampling analysis leach liquor concentration, bacterial concentration, and adjust the air flow quantity size.
Example 2: military service refuse dump.The refuse dump of being on active service is leached facility and is formed gradually along with discharging wastes, and cloth liquid and liquid collection system have singularity.Because the interference of casting operation adopts the pre-making cement pipe of inclination mode to constitute cloth liquid and receipts liquid facility, its inclination angle is consistent with side slope inclination angle, refuse dump, is 30～40 °, and the face of land no longer is provided with liquid distribution system.The cement pipe diameter is 100～150mm, and outer wall is provided with the ommatidium that diameter is 4～10mm, is the passage for leaching solution and gas.The casting operation is carried out simultaneously with the leaching operation, does not disturb mutually.
Example 3: southern refuse dump.Refuse dump, south average temperature of the whole year is higher, temperature controlled focusing on soaking the heap cooling.Heap top cloth liquid adopts the spray mode, and spray thrower is the Senniger rotary swing type, and the water spray bore is 8mm, spray radius 6～8m.Set up a series of borings in the heap and carry out cloth liquid and receive liquid, the aperture is 150mm.Strengthen the circular flow of face of land spray flux or quickening leaching solution summer, make the leaching solution total flux increase 50～60 times, and prolong the cloth liquid time, realize uninterruptedly operation continuously.Simultaneously, daytime is supply air in heap continuously, and air demand is stabilized in 3600～5400m
3/ h.Finally soaking stack temperature drops to about 35 ℃.
Example 4: northern refuse dump.For northern extremely frigid zones dump leaching factory, soak stack temperature control mainly is how to improve the leaching solution temperature.Heap top cloth liquid adopts and drips pouring mode, the average spray area 0.16m of each transmitting tube
2, the spray uniformity coefficient is carried out the leisure operation more than 90%, and leisure is than being 3: 1.Leach based on cloth liquid in piling the refuse dump, and collecting tank and leaching solution pumping system are located at indoor, the heat steam between heater car is fed collecting tank heat, and the circulation fluid temperature is controlled at about 25 ℃.Adding the asbestos thermal insulation layer on outdoor transport pipe is incubated.Soak the long-term temperature of heap more than 15 ℃.
Claims (4)
1. refuse-dump pipe injection leaching-out method is characterized in that: according to a soil thickness exploiting field is divided in the refuse dump, the exploiting field area is at 100 * 100～500 * 500m
2Between, adopt leaching solution to implement to leach to each exploiting field, leaching solution adopts heap top cloth liquid and the interior cloth liquid phase bonded associating of heap cloth liquid form, wherein piling top cloth liquid coverage is 0～30% of the total area, cloth liquid accounts for 70～100% in the heap, constructs seepage proof curtain around constructing heelpiece and leaching the district in the heap of refuse dump, and leach liquor is by collecting tank and heap internal drilling combination collection, collecting tank is collected the side slope leach liquor, and leach liquor in the heap is collected in boring;
Described leaching solution is that solvent is that the pH value is 1.5～2.5 H
2SO
4Solution, bacterium is the chemoautotrophic bacteria after taming, bacterial concentration is 106～108/ml;
Heap top cloth liquid adopts face of land spray, and spray thrower net degree is (10～15) * (10～15) m
2, spray liquid intensity is 5～15L/m
2.h; Cloth liquid is implemented by the liquid distributing hole that is arranged in the heap in the heap, and the liquid distributing hole aperture is 100～400mm, and hole depth is the heap body thickness, and the net degree of liquid distributing hole is 10 * 10～50 * 50m
2
Also be provided with the liquid-collecting hole that the aperture is 100～400mm in the heap of refuse dump, hole depth is the heap body thickness, and the net degree of liquid-collecting hole is 10 * 10～50 * 50m
2, liquid distributing hole and liquid-collecting hole are staggered.
2. lixiviation process according to claim 1 is characterized in that: described leaching solution can also be 20～30% ammoniacal liquor, and adds (the NH of 2mol/L
4)
2CO
3, or (NH
4)
2SO
4, the pH value of solution value is 8～10.
3. lixiviation process according to claim 1 is characterized in that: heap top cloth liquid can also adopt the pouring form of dripping, and dripping pouring device net degree is (0.2～0.4) * (0.2～0.4) m
2, dripping and drenching intensity is 2～5L/m
2.h.
4. lixiviation process according to claim 1 is characterized in that: summer the leaching solution temperature at 20～30 ℃, control leaching solution flow makes cloth liquid intensity at 0.1～1.0m
3/ m
2.h between, make and soak stack temperature and be controlled at below 40 ℃; Make winter the leaching solution temperature between 20～25 ℃, flow control is at 0.01～0.05m
3/ m
2.h, make and soak stack temperature and remain on more than 15 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100324247A CN1304608C (en) | 2005-11-24 | 2005-11-24 | Refuse-dump pipe injection leaching-out method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100324247A CN1304608C (en) | 2005-11-24 | 2005-11-24 | Refuse-dump pipe injection leaching-out method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1775967A CN1775967A (en) | 2006-05-24 |
| CN1304608C true CN1304608C (en) | 2007-03-14 |
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ID=36765685
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100324247A Expired - Fee Related CN1304608C (en) | 2005-11-24 | 2005-11-24 | Refuse-dump pipe injection leaching-out method |
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| CN (1) | CN1304608C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251102A (en) * | 2010-12-27 | 2011-11-23 | 兰州金川新材料科技股份有限公司 | Method for heap-leaching nickel from laterite by using sulfuric acid |
| CN110219321A (en) * | 2019-07-01 | 2019-09-10 | 付文堂 | A kind of pneumatic reinforcement means of heap body |
| CN112522511B (en) * | 2020-11-09 | 2021-12-10 | 紫金矿业集团股份有限公司 | Waste rock recycling method for refuse dump |
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- 2005-11-24 CN CNB2005100324247A patent/CN1304608C/en not_active Expired - Fee Related
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| CN1775967A (en) | 2006-05-24 |
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Granted publication date: 20070314 |