CN103495496A - Wet-process dry stacking method of wet-process mineral separation tailing pond - Google Patents
Wet-process dry stacking method of wet-process mineral separation tailing pond Download PDFInfo
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- CN103495496A CN103495496A CN201310484452.7A CN201310484452A CN103495496A CN 103495496 A CN103495496 A CN 103495496A CN 201310484452 A CN201310484452 A CN 201310484452A CN 103495496 A CN103495496 A CN 103495496A
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Abstract
The invention discloses a wet-process dry stacking method of a wet-process mineral separation tailing pond. Dehydration water repellent agents are added in the waste ore slurry discharging process, waste ore slurry and the dehydration water repellent agents are fully mixed and react in a pipeline through a turbulence function, and slurry and water are fast separated when discharging is carried out at a discharge opening. The wet-process dry stacking method is good in solid-liquid separation effect, and the solid content of instantaneous slurry is more than 40%; natural storage is carried out for about seven days, the solid content reaches 60%, even more than 75%, the slurry with the low water content is naturally stacked or pre-cultivated, or metal in slurry with the low water content is re-screened, and separated clear water can be recycled or directly discharged. The wet-process dry stacking method is simple in process, low in labor intensity, large in treatment capacity and less in improvement investment, the original tailing pond does not need to be greatly changed, expensive dehydration equipment does not need to be added, proper equipment dissolving the dehydration water repellent agents only needs to be added, economic benefits and social benefits are obvious, popularization and using are easy, and the mode of an existing storage tailing pond directly discharging waste ore slurry, plate-frame pressure filtration and other solid-liquid separation processes can be replaced.
Description
Technical field
The invention belongs to wet dressing Tailings Dam processing technology field, relate in particular to a kind of wet method dry heaping method of wet dressing Tailings Dam.
Background technology
Wet dressing (washup) produces a large amount of waste water, starch in (ore deposit) to abandon mud, and the mode that the abandoned mine slurry is deposited at present has two kinds:
One, in line
At present, the waste water that China's wet dressing (washup) overwhelming majority still adopts Tailings Dam to deposit wet dressing (washup) to produce, abandon mud (ore deposit) slurry, the task of Tailings Dam and Main Function are exactly the waste water of forever depositing this technique, abandon mud (ore deposit) slurry, thereby it is that the key link that mine tailing is processed is produced in mining industry.This method advantage is simple, yet there are problems in this technique
(1) cost is high, and treating capacity is larger, and cost becomes how much multiples to increase.
(2) potential safety hazard is huge, and later maintenance cost is high.Because very large containing wastewater flow rate, mud (ore deposit) slurry moisture content very high (being generally 70%), may, because of change or the destruction of subsurface geology condition, cause subterranean stream to pollute, or the subterranean stream roof fall cause a large amount of overflows of Tailings Dam waste water abandoned mine mud to cause pollution in wide area; More fearful is the disasters such as heavy rain, earthquake, can cause tailing dam to collapse, the security incident that the sludge slurry pours out; Even, to the envelope storehouse, potential safety hazard is long-term existence still.
(3) the addressing difficulty of new Tailings Dam, because Tailings Dam need to take large tracts of land land resource, and geological conditions is very strict, also need be away from village etc.
(4) the Tailings Dam life-span short because the water content of ore pulp mud is very large, the storage capacity of Tailings Dam is exhausted soon.
(5) water cannot reuse.
Two, after Separation of Solid and Liquid, discharge.
This mode mainly contains plate compression or centrifugation and filter.
Its advantage be abandoned mine mud admittedly containing high, drainage can reuse, security is large, increases storage capacity, the prolonging tailing storehouse life-span.Shortcoming is that disposal ability is little, poor continuity; Labour intensity is large; Need to increase expensive equipment; Later maintenance cost is high.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of wet method dry heaping method that increases storage capacity, raising security, reduces the wet dressing Tailings Dam that pollutes, reducings the construction costs.
For solving the problems of the technologies described above, the present invention is by the following technical solutions: the wet method dry heaping method of wet dressing Tailings Dam, when abandoned mine mud during from pipeline to the Tailings Dam transportation, 50～200 meters before pipe outlet, to the dehydration water-repelling agent solution 200～1000g/ ton over dry sludge that adds mass concentration 1 ‰～3 ‰ in abandoned mine mud.
Abandoned mine mud is containing solid≤40%.
Abandoned mine mud is containing solid 25～32%.
The dehydration water-repelling agent is polyacrylamide.
The molecular weight of polyacrylamide is 1000～1,800 ten thousand.
Polyacrylamide is nonionic, anionic or cationic.
Dehydration water-repelling agent solution usage is 400～500g/ ton over dry sludge.
Process the problem existed for current wet dressing mine tailing, the inventor has set up the wet method dry heaping method of wet dressing Tailings Dam of the present invention, add the dehydration water-repelling agent in abandoned mine mud emission process, make abandoned mine mud and dehydration water-repelling agent pass through the abundant hybrid reaction of turbulent flow in pipeline, when the floss hole discharging, muddy water separates rapidly, and moment, the sludge solid content was more than 40%; About natural storage seven days, sludge is hydrophobic and Action of Gravity Field by automatic dehydration, and the gob pile of stacking forms be full of cracks, and solid content reaches 60% even more than 75%, the sludge that moisture content is low is naturally stacked or is reclaimed or again screen wherein metal, but the clear water reuse of separation or directly discharge.
In abandoned mine slurry, particle is very little and viscosity is very strong, and in natural subsidence, solid-liquid is difficult to separate, and uses the equipment such as flame filter press, centrifuge to carry out Separation of Solid and Liquid; disposal ability is little, and labour intensity is large, takies local large; maintenance cost is high, thereby can't realize continuous large-scale production.The present invention's dehydration water-repelling agent used belongs to high molecular polymer, nontoxic, to environment and biological friendly, in food processing and drinking water treatment, all can use.The dehydration water-repelling agent has netted or long-chain shape structure, and molecular weight is higher, and specific electrical and charge density is arranged.The present invention utilizes the macromolecular chain of dehydration water-repelling agent just, in the abandoned mine slurry, suspend between a tears and particle by " charge neutrality " and " bridge formation " effect, different segments are adsorbed on variable grain, promote material and a particle aggregation, constantly be gathered into more closely knit group and constantly become large under the effect of the rapid power of conveyance conduit, at floss hole, reach rapidly the Separation of Solid and Liquid purpose.
Technique of the present invention is simple, labour intensity is little, disposal ability is large, and the transformation less investment, without changing greatly, do not need to increase expensive dehydration equipment to the original debris storehouse yet, only needs the equipment that adds suitable dissolving dehydration water-repelling agent to get final product.Practice shows, applies solid-liquid separation effect of the present invention good, can realize continuously a large amount of production, increases the storage capacity at least 50% of existing Tailings Dam, extends the storage capacity life-span, and the security that has improved Tailings Dam, reduce possibility of pollution; Because the increase of sludge solid content, can increase backwater, at least improve 50%; Can reduce the difficulty of investment and the minimizing addressing of new Tailings Dam; Sludge is used for building tailing dam or reclaims.Visible, economic benefit of the present invention and social benefit are very remarkable, are easy to promote the use of, and can replace the solid-liquid separation process such as the in line mode of depositing Tailings Dam of present abandoned mine slurry and plate compression.
The accompanying drawing explanation
Fig. 1 is the process chart of the wet method dry heaping method of wet dressing Tailings Dam of the present invention.
Fig. 2 is the in line process chart of depositing Tailings Dam of abandoned mine slurry.
Fig. 3 is abandoned mine pulpboard frame press filtration solid-liquid separation process flow chart.
The specific embodiment
One, blance test
Adopt the abandoned mine slurry (in Table 1) that the present invention is producing Guangxi Chinalco to carry out blance test.
Table 1
| Containing solid | The mud particle fineness | pH | Discharge capacity |
| 28-32% | -200 orders | 7.2 | 800m 3/h |
Main agents: dehydration water-repelling agent polyacrylamide, anionic, molecular weight is 1000～1,800 ten thousand.
Key instrument: PH meter, moisture teller, viscosimeter, beaker, measuring pump, pipeline 150m
3/ h, Plastic Drum, ruler, syringe (1-25ml).
(1) dehydration water-repelling agent addition and solid-liquid separation effect relation
Get containing the abandoned mine slurry 200ml that is respectively admittedly 25%, 28%, 30%, 32%, 35% at every turn, undertaken by technological process shown in Fig. 1 and condition.Repeatedly add respectively the dehydration water-repelling agent solution (mass concentration 2 ‰) dissolved, topple over back and forth at the beaker of two 400ml, until moment is while Separation of Solid and Liquid occurring.By difference, containing solid abandoned mine slurry, add the dehydration water-repelling agent solution of different amounts to repeat said methods, until moment only Separation of Solid and Liquid occurs, record is used the consumption of dehydration water-repelling agent and topples over number of times, as table 2:
Table 2
| Abandoned mine slurry concentration (solid content) | 25% | 28% | 30% | 32% | 35% |
| Dehydration water-repelling agent solution usage (ml) | 15 | 17 | 19 | 22 | 26 |
| Topple over number of times | 28 | 30 | 32 | 32 | 40 |
| Go out water ph value | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 |
| The suspension situation | Clearly | Clearly | Clearly | Clearly | Clearly |
The demonstration of table 2 data, under other condition same case, it is different that the abandoned mine of different solid contents slurry is used the consumption of dehydration water-repelling agent, the number of times of toppling over is also not identical.So this law is regulated the addition of dehydration water-repelling agent according to abandoned mine slurry (containing solid) concentration with measuring pump, according to toppling over the length of number of times design from the chemical feeding points to the floss hole.
(2) parallel test
This test and following test add respectively the dehydration water-repelling agent solution (mass concentration 2 ‰) prepared in advance while by solid content, being 30% abandoned mine slurry 200ml, 300ml, 500ml, topple over back and forth until moment only Separation of Solid and Liquid occurs, and record data, as table 3:
Table 3
Result shows, the reappearance of the inventive method parallel test is better.
(3) become mud after application the present invention containing solid situation of change (normal temperature laboratory), in Table first group of 4() and show second group of 5().
Table 4
| Time (h) | Containing solid (%) | Moisture (%) | The range estimation outward appearance |
| 24 | 40 | 60 | Do not flow, moulding |
| 48 | 43.03 | 56.97 | Do not flow, moulding |
| 72 | 45.92 | 54.08 | Moulding, hardness forms |
| 96 | 55.72 | 44.27 | Hardness forms |
| 120 | 62.61 | 37.39 | Hardness is general |
| 144 | 67 | 32.99 | Hardness is better |
Table 5
| Time (h) | Containing solid (%) | Moisture (%) | The range estimation outward appearance |
| 24 | 40 | 60 | Do not flow, moulding |
| 48 | 45.9 | 54.1 | Do not flow, moulding |
| 72 | 49.36 | 50.64 | Hardness forms |
| 96 | 57.31 | 42.69 | Hardness is general |
| 120 | 63.63 | 36.37 | Hardness is better |
| 144 | 69.1 | 30.9 | Hardness is good |
Two, production practices
With reference to Fig. 1, processing method of the present invention is applied to Guangxi Chinalco and produces mine tailing mud produced on-site.
1, the technological parameter condition is as follows:
(1) mine tailing mud is containing solid (28-30%)
(2) drain tube ∮ 273mm
(3) mud speed rate 300-600m
3/ h
(4) dehydration water-repelling agent concentration of polymer solution 1.875 ‰;
(5) two (every flow 24m of dehydration water-repelling agent delivery pump
3/ h, 40 meters of lifts)
(6) adding the dehydrating agent point is four points (first 150 meters, 100 meters, 100 meters, 50 meters of pipe outlet)
(7) spoil disposal place size: long 110 meters, wide 50 meters, dark 2.5 meters.
2, result
(1) the mud discharging mouth mud-water separation is obvious;
(2) mud that approximately flows after mud-water separation after 20 meters forms dry beach and does not flow, and slowly forms dry dust; Dry dust is in layer to form, and forming process is not taken away original formation mud layer, has shown the stability that forms mud layer;
(3) forming dry beach has be full of cracks to form after 24 hours, during lower moderate rain, rainwater fails to wash away the mud layer that dry beach forms, and the beach be full of cracks of the 5th the Heavenly Stems obviously;
(4) spoil disposal is containing solid situation (in Table 6)
Table 6
| Time (h) | 24 | 48 | 72 | 96 | 120 | 144 | 168 | 192 | 216 | 240 |
| Containing solid (%) | 40 | 45.5 | 50.3 | 55 | 58.3 | 60 | 62 | 62.5 | 63 | 64.3 |
(5) dehydration water-repelling agent solution usage
It is 388-525g that A over dry mud per ton is used dehydration water-repelling agent solution;
B mud ore deposit contains while admittedly hanging down uses the hydrophobic dosage of dehydration few, but form, does beach far (30 meters);
C mud ore deposit 30% the time, is used dehydration water-repelling agent solution to be about over dry mud 500g per ton containing solid, forms dry beach better (in 20 meters), and mud-water separation is thorough;
(6) discharge water censorship result following (table 7):
Table 7
Table 7 data show, application the present invention processes abandoned mine mud and separates the discharge water obtained and reach earth's surface level water quality standard.
Three, method contrast
According to above-mentioned test and other test, the present invention compares with the filter press evaporation with traditional in line mine tailing stock method, and technique advanced person is with the obvious advantage, synthetical comparison and assessment result following (table 8):
Table 8
The above results shows, apply wet method dry heaping method of the present invention, too many permanent plant need not be dropped into and the abandoned mine slurry can be realized processing continuously, dehydrating effect is good, forms the mechanical property of piling the solid speed of mud soon and can improve tailings mud, the service life in prolonging tailing storehouse, improve the tailings recycling water ability, overflow water and reach the surface water emission request, improve the security of Tailings Dam, meet modern Safety of Tailings Dam and environmental requirement.Therefore, the present invention can be used for instructing the new design of Tailings Dam in the future, for reducing newly-built Tailings Dam cost and land reclamation in mining area, provides convenience.
Claims (7)
1. the wet method dry heaping method of a wet dressing Tailings Dam, it is characterized in that: when abandoned mine mud during from pipeline to the Tailings Dam transportation, 50～200 meters before pipe outlet, to the dehydration water-repelling agent solution 200～1000g/ ton over dry sludge that adds mass concentration 1 ‰～3 ‰ in abandoned mine mud.
2. the wet method dry heaping method of wet dressing Tailings Dam according to claim 1 is characterized in that: described abandoned mine mud is containing solid≤40%.
3. the wet method dry heaping method of wet dressing Tailings Dam according to claim 2 is characterized in that: described abandoned mine mud is containing solid 25～32%.
4. the wet method dry heaping method of wet dressing Tailings Dam according to claim 1, it is characterized in that: described dehydration water-repelling agent is polyacrylamide.
5. the wet method dry heaping method of wet dressing Tailings Dam according to claim 4, it is characterized in that: the molecular weight of described polyacrylamide is 1000～1,800 ten thousand.
6. the wet method dry heaping method of wet dressing Tailings Dam according to claim 5, it is characterized in that: described polyacrylamide is nonionic, anionic or cationic.
7. the wet method dry heaping method of wet dressing Tailings Dam according to claim 6, it is characterized in that: described dehydration water-repelling agent solution usage is 400～500g/ ton over dry sludge.
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Citations (7)
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| CN101156996A (en) * | 2007-08-03 | 2008-04-09 | 中国铝业股份有限公司 | A method for the sedimentation of bauxite cradling tailings |
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2013
- 2013-10-16 CN CN201310484452.7A patent/CN103495496A/en active Pending
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| CN101156996A (en) * | 2007-08-03 | 2008-04-09 | 中国铝业股份有限公司 | A method for the sedimentation of bauxite cradling tailings |
| CN201260904Y (en) * | 2008-09-12 | 2009-06-24 | 昆明理工大学 | Device for mixing flocculating reagent solution and mash |
| CN101391847A (en) * | 2008-09-27 | 2009-03-25 | 昆明钢铁集团有限责任公司 | Method for treating tailing water from mineral processing plant by microwave |
| CN101559295A (en) * | 2009-05-08 | 2009-10-21 | 昆明理工大学 | Tailing dry heaping method |
| CN101708483A (en) * | 2009-11-07 | 2010-05-19 | 核工业烟台同兴实业有限公司 | Tailing dry-heaping equipment and processing technique thereof |
| CN101733200A (en) * | 2009-12-25 | 2010-06-16 | 中南大学 | Method for processing bauxite tailings by flocculating agent |
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Application publication date: 20140108 |