CN101391847B - Method for treating tailing water from mineral processing plant by microwave - Google Patents
Method for treating tailing water from mineral processing plant by microwave Download PDFInfo
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- CN101391847B CN101391847B CN2008100589858A CN200810058985A CN101391847B CN 101391847 B CN101391847 B CN 101391847B CN 2008100589858 A CN2008100589858 A CN 2008100589858A CN 200810058985 A CN200810058985 A CN 200810058985A CN 101391847 B CN101391847 B CN 101391847B
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Abstract
The invention provides a method for treating iron ore site-selection tailing water by utilizing microwave, which comprises the following technical steps: tailing mash is sent to an adjusting tank for adjusting the concentration to 9-11 percent, then sent to a stirring tank with the flow of 160-292m<3>/h, and simultaneously quicklime is dosed into the tailing mash according to the dosing amount of0.25-0.35kg/m<3>, the tailing mash is stirred at room temperature until the pH value is 10-14, a treatment agent is dosed into the tailing mash according to the dosing amount of 0.117-0.135L/m<3>, the tailing mash is stirred at room temperature until the pH value is 6-9, the tailing mash is sent to an industry microwave oven with the flow of 160-292m<3>/h, under the conditions of the power of 40-50kw and the frequency of 915 MHz, the tailing mash is treated for 1-2 seconds by the microwave and then sent to a turbidness tank for depositing for 240-300 minutes, overflow water is recycled, substrate sludge is sent to a tailing dam for placing. The method realizes the recycling of the tailing water, not only solves the problem of short water resources, but also avoids the potential safety hazard resulted from wet beaches and reduces the manufacture cost.
Description
Technical field
The present invention relates to the tailings water treatment process that a kind of iron ore selects factory, especially a kind of method of utilizing treating tailing water from mineral processing plant by microwave belongs to the tailings water processing technology field.
Background technology
At present, the imbalance between supply and demand of China's water resources is more serious.In national 640 cities, the lack of water city reaches more than 300, and wherein the city of serious water shortage is 114,1,600 ten thousand tons of day lacks of water, and the annual direct economic loss that causes because of lack of water reaches 2,000 hundred million yuan, and every year is produced grain 700～80,000,000,000 kg less because of lack of water in the whole nation.It is predicted that 2010, national total supply was 6200～6,500 hundred million m
3, corresponding total water requirements will reach 7,300 hundred million m
3, nearly 1,000 hundred million m of insufficiency of supply-demand
3
Water is the lifeblood of human survival, also is the basis of economic growth and social progress.The high unity of water resources amount of being and matter; 21 century, China was faced with the crisis of the water yield; simultaneously water pollute more serious, even because of water resources crisis that quality problem caused greater than water yield crisis, thereby to carry out with the cycling use of water be the current industrial first-selection of technological line at center.At present iron ore selects factory to be in mostly on the mountain of lack of water or on the hillside, the mill water amount is very big, the loss amount of water is also very surprising simultaneously, remote pump water replenishes, not only investment is big, the cost height, and be difficult to provide competent water source, for solving the matter of utmost importance that this restriction ore dressing is produced, carry out the research of utilization once more of water resources extremely urgent.Especially after implementing the spoil reclaming engineering, since select again the mine tailing grade thin, contain that mud is heavier, sedimentation speed is slow, exist with paste-like all the time, can't form dried beach after making it to enter the mine tailing storehouse, and in case the accident of new mine tailing storehouse causes catastrophic loss can for downstream, reservoir area people's lives and properties.Therefore, the mine tailing of high moisture lower concentration forms threat to the safety in new mine tailing storehouse, and the shipwreck of ore dressing simultaneously more can't realize recycle in recovery,
Summary of the invention
For the ore dressing water in the mine tailing ore dressing process being reclaimed and recycles, to reduce water resources consumption to greatest extent, bed mud water content after the ore dressing is reduced, be beneficial to tailing dam and form dried beach, potential safety hazard to avoid wet beach to bring the invention provides a kind of method of utilizing treating tailing water from mineral processing plant by microwave.
The present invention realizes by following technical proposal: a kind of method of utilizing treating tailing water from mineral processing plant by microwave is characterized in that through following process steps:
A, mine tailing slurry sent into equalizing tank after, control mine tailing slurry concentration to 9%～11%;
B, with the mine tailing of equalizing tank slurry with 160～292m
3The flow quantity self-adjusting joint pond of/h is sent in the stirred pot, simultaneously by 0.25～0.35kg/m
3Dosage, in mine tailing slurry, drop into unslaked lime, stirring ore pulp to pH value under the room temperature is 10～14;
C, by 0.117～0.135L/m
3Dosage, in ore pulp, add treatment agent again, stirring ore pulp to pH value under the room temperature is 6～9, to quicken the flocculation of mine tailing slurry;
D, with the mine tailing of above-mentioned C step slurry by 160～292m
3The flow of/h is sent in the industrial microwave oven, is 40～50kw at power, and frequency is under the condition of 915MHz, and microwave treatment mine tailing slurry 1～2 second is 6.5～8.5 through the tailings water pH value after the microwave treatment;
E, above-mentioned mine tailing slurry after the microwave treatment of D step is sent in the thickening pond, precipitated after 240～300 minutes, the overflow water recycling use, bed mud send tailing dam to deposit.
The treatment agent of described C step is formulated as follows: get raw material by following mass ratio: ferric sulfate: Tai-Ace S 150: iron trichloride=1:0.1～0.3:0.03～0.06, earlier that ferric sulfate is soluble in water to saturated solution, in saturated solution, add Tai-Ace S 150 and iron trichloride, allocating concentration into by the amount of 8～10g/L again is 98% sulfuric acid, and stirring promptly gets treatment agent.
The stirrer rotating speed of described B step is controlled at 12～20 commentaries on classics/min.
The stirrer rotating speed of described C step is controlled at 12～20 commentaries on classics/min
Described industrial microwave oven is commercial product, and its processing capacity is selected according to producing needs.
Described equalizing tank, stirred pot, thickening pond are commercial product, and its processing capacity is selected according to producing needs.
The present invention compared with prior art has following advantage and effect: adopt such scheme, can effectively reduce the water content in the mine tailing, improve mine tailing slurry concentration, accelerate tailing slurry settlement speed, and the bed mud after the sedimentation filters easily, be beneficial to tailing dam and form dried beach, supernatant liquor after the sedimentation is as clear as crystal, ore dressing water rate of recovery height, and backwater is quick, realized the recycle of tailings water, both solved the problem of water scarcity, the potential safety hazard of avoiding wet beach to bring has again also lowered production cost, make enterprise in energy-saving and emission-reduction, create more economic benefit, improve the competitive strength of enterprise.
Cumulated volume invention characteristics are as follows: have the investment little, floor space is few, technical process is short, energy consumption is low, working cost is low, treatment project can greatly also can be small-sized decentralized, the contaminant degradation physical reaction is rapid, pollution clean-up is thorough, treatment progress is not subjected to the influence of environment and raw waste water Pollutant levels, can be as required in the treating processes random start-stop, realize the advantages such as sustainable use of water.
The present invention utilizes the microwave field energy to single-phase flow or the heating of polyphasic flow fluidic dilute phase selectivity, the physical reaction of inhaling the ripple material in can also convection cell has the intensive katalysis, and convection cell has the stronger penetration and the plurality of advantages such as effect of killing microorganisms thereof, input in conjunction with auxiliary and mixture, the microwave thermal energy focus, influence simultaneously the process of reaction by medicament and reactant and the interactional selectivity of product, pollutent in the microwave induction catalytic reaction pair water is degraded by physics and chemical action, transform, make the colloid in the water, the suspended substance flocculation sediment.
Description of drawings
Fig. 1 is a process flow sheet of the present invention;
Fig. 2 starches natural subsidence for the small-scale test mine tailing and the present invention handles average water rate comparison diagram;
Fig. 3 is a medium-sized test chart comparison diagram;
Fig. 4 is base period and technology operating period of the present invention supernatant liquor degree of depth comparison diagram in a underflow discharging cycle;
Embodiment
Below by specific embodiment the present invention is described further.
The main technical details of present embodiment: day processing mine tailing water yield 10000m
3, the mine tailing slurry concentration 15% before handling, the thickening pond underflow density 25% after the processing, spillway discharge 4000m
3
The parameter of equipment used:
Microwave oven: model F-WB-2, nominal capacity 5000m
3, 45 kilowatts of power;
Stirred pot: model φ 3, nominal capacity 2500m
3, 5 kilowatts of power;
Equalizing tank: capacity 100m
3
53 meters of thickening pond diameter of phi, 2.8 meters of center line averages, the maximum flow 800m that handles
3/ h, top flow velocity 2～4mm/s.
Microwave treatment mine tailing slurry running cost (not containing depreciation funds) is as following table:
| Medicament unit/m 3 | Power consumption unit/m 3 | Labour cost unit/m 3 | Upkeep cost unit/m 3 | Add up to unit/m 3 |
| 0.132 | 0.123 | 0.12 | 0.1 | 0.475 |
Concrete processing step is as follows:
A, mine tailing slurry is sent into 100m
3Equalizing tank after, control mine tailing slurry concentration to 9%, uniform and stable with the water yield, the water quality that guarantee to enter microwave oven;
B, with the mine tailing of equalizing tank slurry with 160m
3The flow quantity self-adjusting of/h joint pond is sent in stirred pot, presses 0.25kg/m simultaneously
3Dosage in stirred pot, drop into unslaked lime, be under the condition of 18 commentaries on classics/min at normal temperature, stirrer rotating speed, stirring ore pulp to pH value is 10, churning time is 2min;
C, with the ore pulp of B step with 160m
3The flow of/h is sent in No. two stirred pots, presses 0.117L/m simultaneously
3Dosage, in No. two stirred pots, add treatment agent, at normal temperature, the stirrer rotating speed is under the condition of 15 commentaries on classics/min, stirring ore pulp to pH value is 6, churning time is 2min, to quicken the flocculation of mine tailing slurry, described treatment agent is formulated as follows: the raw material that takes off the row mass ratio: ferric sulfate: Tai-Ace S 150: iron trichloride=1:0.1:0.03, earlier that ferric sulfate is soluble in water to saturated solution, add Tai-Ace S 150 and iron trichloride in saturated solution, allocating concentration into by the amount of 8g/L again is 98% sulfuric acid, and stirring promptly gets treatment agent;
D, the mine tailing of above-mentioned C step slurry is pressed 160m
3The flow of/h is sent in the industrial microwave oven, is 40kw at power, and frequency is under the condition of 915MHz, and microwave treatment mine tailing slurry 2 seconds is 6.5 through the tailings water pH value after the microwave treatment;
E, will send in the thickening pond through the mine tailing after the microwave treatment of D step slurry, precipitate after 240 minutes, to promote particle collision in the tailings water, form alumen ustum, produce contact cohesion and adsorption, mud-water separation takes place, the overflow water recycling use after the separation, after bed mud sent tailing dam, formation was done the beach and is conveniently deposited easily.
The main technical details of this practicality example is all identical with embodiment 1 with equipment and parameter.
Concrete steps are as follows:
A, mine tailing slurry sent into equalizing tank after, control mine tailing slurry concentration to 11%;
B, with the mine tailing of equalizing tank slurry with 290m
3The flow quantity self-adjusting joint pond of/h is sent in the stirred pot, presses 0.35kg/m simultaneously
3Dosage, drop into unslaked lime in mine tailing in the stirred pot slurry, stirring ore pulp to pH value under the room temperature is 14;
C, with the ore pulp of B step with 240m
3The flow of/h is sent in No. two stirred pots, presses 0.135L/m
3Dosage, add treatment agent in the ore pulp in No. two stirred pots again, at normal temperature, stirrer rotating speed is under the condition of 15 commentaries on classics/min, stirring ore pulp to pH value is 9, churning time is 2min, quicken the flocculation of mine tailing slurry, treatment agent is formulated as follows: get raw material by following mass ratio: ferric sulfate: Tai-Ace S 150: iron trichloride=1:0.3:0.06, earlier that ferric sulfate is soluble in water to saturated solution, in saturated solution, add Tai-Ace S 150 and iron trichloride, allocating concentration into by the amount of 10g/L again is 98% sulfuric acid, and stirring promptly gets treatment agent;
D, the mine tailing of above-mentioned C step slurry is pressed 290m
3The flow of/h is sent in the industrial microwave oven, is 50kw at power, and frequency is under the condition of 915MHz, and microwave treatment mine tailing slurry 1 second is 8.5 through the tailings water pH value after the microwave treatment;
E, above-mentioned mine tailing slurry after the microwave treatment of D step is sent in the thickening pond, precipitate 300 minutes, to promote particle collision in the tailings water, form alumen ustum, produce contact cohesion and adsorption, mud-water separation takes place, the overflow water recycling use after the separation, bed mud send to form easily behind the tailing dam and does the beach and conveniently deposit.
Verify effect of the present invention below by concrete test.
Test objective: verify treatment agent of the present invention and industrial microwave oven dual function to the mine tailing slurry.
Condition: the mine tailing slurry adds treatment agent and handles through industrial microwave oven.
1, the effect of small-scale test (2000ml graduated cylinder) checking technology of the present invention
(1) small-scale test mine tailing slurry natural subsidence and the present invention handle average water rate and relatively see Fig. 2.
(2) small-scale test (2000ml graduated cylinder) interpretation of result:
1. compare with mine tailing slurry natural subsidence, in the identical settling time, starch average water rate with addition of treatment agent through the mine tailing of microwave treatment and improve 5.5 percentage points, average aquifer yield has improved 1.12ml/min, proves with addition of treatment agent of the present invention and industrial microwave oven the solid-liquid separation of quickening mine tailing is had certain effect;
2. the colourity that contrasts supernatant liquor shows that it is less through the mine tailing slurry supernatant liquor colourity of microwave treatment to add treatment agent of the present invention, illustrates that treatment agent of the present invention and industrial microwave oven have tangible effect to improving colority of water.
2, medium-sized test (2m
3Water tank) verifies effect of the present invention
(1) the medium-sized test chart is relatively seen Fig. 3.
(2) medium-sized settling test interpretation of result:
From data analysis, at 2m
3In the water tank test, settling time and water rate and average aquifer yield are linear substantially.Add treatment agent of the present invention and after microwave treatment, with the increase of settling time, water rate improves gradually.In the time of 160 minutes, do not improve about 5 percentage point with addition of treatment agent through the average water rate of microwave treatment water outlet than through the microwave treatment water outlet with addition of treatment agent of the present invention, and the trend that continues increase is arranged.
3, effect of the present invention is verified in commerical test (φ 53m thickening pond)
(1) handles Φ 53m thickening pond running condition through the present invention
1. Φ 53m thickening pond outward appearance relatively
The present invention handles back Φ 53m thickening pond supernatant liquor muddiness in diameter 10m scope, and major cause is that tailings water flows in a large number.Supernatant liquor is limpider in diameter 10～45m scope.Supernatant liquor is muddy a little in diameter 45～53m scope, and reason is the not continuous spoil disposal of φ 53m thickening pond, and part deposits bed mud and takes place to suspend once more because of the trolley travelling disturbance.Supernatant liquor and bed mud boundary are clear.
53 meters thickening pond situations of operating period Φ of the present invention
| Pitch time after 53 meters underflow dischargings of Φ finish | Supernatant liquor center line average unit (cm) | Overflow port water outlet situation | Overflow water suspended substance (mg/l) |
| 0 hour | 29.4 | Discharge is little, and colourity is limpid | 11 |
| 1 hour | 24.6 | Discharge is big, and colourity is limpid | 9 |
| 2 hours | 19.0 | Discharge is big, and colourity is limpid | 8 |
| 3 hours | 11.9 | Discharge is big, begins to run muddy | 14 |
| 4 hours | 6.1 | Discharge is big, muddiness | 16113 |
2. supernatant liquor degree of depth increase, underflow density raise, and overflow water colourity is improved.
Show according to overflow water suspended substance analytical results: base period overflow water be 4643mg/l at the little back of row's underflow 3 suspended substances, and use the overflow water of art breading of the present invention only to be 14mg/l at row's underflow 3 little back suspended substances, prove that microwave technology has remarkable effect to reducing suspended substance.
3. the average supernatant liquor degree of depth of base period and art breading of the present invention, underflow density comparison sheet
| Project | Supernatant liquor mean depth (cm) | Average underflow density (%) |
| Base period | 11.6 | 21.69 |
| Project | Supernatant liquor mean depth (cm) | Average underflow density (%) |
| Through the microwave art breading | 22.3 | 35.64 |
4. through art breading Φ 53m thickening pond overflow water water quality analysis comparison sheet of the present invention
| Project | PH value | Chemical oxygen demand COD Cr(mg/L) | Biochemical oxygen demand (BOD) BOD 5(mg/L) | Suspended substance ss (mg/L) | Ammonia nitrogen (mg/L) | Total phosphorus (mg/L) |
| Design objective | 6.5～8.5 | ≤60 | ≤10 | ≤30 | ≤10 | ≤1 |
| Through microwave treatment and add treatment agent | 8.30 | 31 | 4.8 | 17 | 0.102 | 0.014 |
| Base period | 8.13 | 110 | 33.2 | 860 | 0.072 | 0.294 |
5. supernatant liquor depth ratio in a underflow discharging cycle is seen Fig. 4 base period and technology operating period of the present invention.
6. Φ 53m thickening pond backwater amount relatively after the art breading of the present invention
(2) commercial test results analysis
Commerical test shows: with base period data contrast, the mine tailing slurry is through the dual function of treatment agent of the present invention and microwave, the supernatant liquor mean depth has improved 92.24%, prolonged the time that φ 53m thickening pond goes out overflow water up to standard, average underflow density has improved 64.32%, the dual function of proof treatment agent and industrial microwave oven is remarkable to the solid-liquid separation effect that quickens the mine tailing slurry, obviously improved simultaneously supernatant liquor colourity, supernatant liquor and bed mud boundary are clear, and φ 53m thickening pond overflow water water quality reaches design objective.
4, suitable treatment agent kind and proportioning exploratory experiment
Purpose: explore different sorts treatment agent, the different settlement influence of through microwave treatment mine tailing being starched with addition of amount, determine suitable treatment agent kind and add proportioning.
Condition: the mine tailing slurry adds treatment agent and handles through industrial microwave oven.
53 meters thickening pond tests of φ contrast under the different condition
53 meters thickening pond testing datas of φ
Treatment agent kind and proportioning exploratory experiment interpretation of result
(1) aquifer yield and the concentration of mine tailing slurry have confidential relation;
(2) add an amount of treatment agent after microwave treatment, aquifer yield increases, and average underflow density brings up to 35.64%;
(3) add micro-treatment agent by after the microwave treatment, aquifer yield obviously increases, and average underflow density brings up to 30.75%.
After using in the waste water microwave treatment of the present invention technical finesse factory's mine tailing slurry, the overflow water water-quality guideline all reaches performance assessment criteria.
Concrete outcome sees the following form:
| Project | PH value | Chemical oxygen demand COD Cr(mg/L) | Biochemical oxygen demand (BOD) BOD 5(mg/L) | Suspended substance ss (mg/L) | Ammonia nitrogen (mg/L) | Total phosphorus (mg/L) |
| The GB standard | 6.5～8.5 | ≤60 | ≤10 | ≤30 | ≤10 | ≤1 |
| Base period | 8.13 | 110 | 33.2 | 860 | 0.072 | 0.294 |
| After the present invention handles | 8.30 | 31 | 4.8 | 17 | 0.102 | 0.014 |
Underflow density is increased to 35.64% by 21.69%, has increased by 64.32%.
Per day backwater amount is by the 1692.6m of base period
3Increase to 2914.21m
3, the per day backwater 1221.61m that has a net increase of
3, increase by 72.2%.
Commerical test studies have shown that treatment technology of the present invention to the solid-liquid separation of quickening the iron tailings slurry, increase the backwater amount, improve backwater water quality tangible effect is arranged.The range of application of microwave sewage disposal technology has been expanded in the success of this commerical test, to handling concentration height, difficult settled Iron Works Plant tailings water, qualitative leap and breakthrough is arranged technically from the lower municipal effluent of concentration of treatment.Waste water microwave treatment The Application of Technology is implemented, and has improved tailings discharging concentration, for realizing the mine tailing storage security, has reduced the security threat in mine tailing storehouse, for realizing that tailing dry-heaping provides technical support.
Claims (4)
1. method of utilizing treating tailing water from mineral processing plant by microwave is characterized in that through following process steps:
A, mine tailing slurry sent into equalizing tank after, control mine tailing slurry concentration to 9%～11%;
B, with the mine tailing of equalizing tank slurry with 160～292m
3The flow quantity self-adjusting joint pond of/h is sent in the stirred pot, simultaneously by 0.25～0.35kg/m
3Dosage, in mine tailing slurry, drop into unslaked lime, stir under the room temperature mine tailing starch to the pH value be 10～14;
C, by 0.117～0.135L/m
3Dosage, in mine tailing slurry, add treatment agent again, stir under the room temperature mine tailing starch to pH value be 6～9, to quicken the flocculation that mine tailing is starched;
D, with the mine tailing of above-mentioned C step slurry by 160～292m
3The flow of/h is sent in the industrial microwave oven, is 40～50kw at power, and frequency is under the condition of 915MHz, and microwave treatment mine tailing slurry 1～2 second is 6.5～8.5 through the tail slurry pH after the microwave treatment;
E, above-mentioned mine tailing slurry after the microwave treatment of D step is sent in the thickening pond, precipitated after 240～300 minutes, the overflow water recycling use, bed mud send tailing dam to deposit.
2. the method for utilizing treating tailing water from mineral processing plant by microwave according to claim 1, the treatment agent that it is characterized in that described C step is formulated as follows: get raw material by following mass ratio: ferric sulfate: Tai-Ace S 150: iron trichloride=1: 0.1～0.3: 0.03～0.06, earlier that ferric sulfate is soluble in water to saturated solution, in saturated solution, add Tai-Ace S 150 and iron trichloride, allocating concentration into by the amount of 8～10g/L again is 98% sulfuric acid, and stirring promptly gets treatment agent.
3. the method for utilizing treating tailing water from mineral processing plant by microwave according to claim 1 is characterized in that the stirrer rotating speed of described B step is controlled at 12～20 commentaries on classics/min.
4. the method for utilizing treating tailing water from mineral processing plant by microwave according to claim 1 is characterized in that the stirrer rotating speed of described C step is controlled at 12～20 commentaries on classics/min.
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| CN101704602B (en) * | 2009-12-03 | 2014-06-18 | 徐有生 | Physicochemical-microwave water treatment method |
| CN103086522B (en) * | 2013-03-04 | 2014-07-09 | 徐有生 | Treatment method of microwave softened hardwater |
| CN103495496A (en) * | 2013-10-16 | 2014-01-08 | 陈谦 | Wet-process dry stacking method of wet-process mineral separation tailing pond |
| CN105293656A (en) * | 2014-07-29 | 2016-02-03 | 施建刚 | Microwave flocculation device |
| CN104176854A (en) * | 2014-08-21 | 2014-12-03 | 营口东吉科技（集团）有限公司 | Method for utilizing mineral separation backwater in magnesite reverse flotation desilicification |
| CN104147814A (en) * | 2014-08-28 | 2014-11-19 | 邓鑫 | Electricity-saving and water-saving method for treating tailings |
| CN112897730B (en) * | 2021-01-07 | 2023-01-06 | 易门铜业有限公司 | System and method for treating and recycling high-arsenic high-fluorine waste acid |
| CN113530550A (en) * | 2021-05-13 | 2021-10-22 | 西北矿冶研究院 | Method for continuously extracting water-containing tailings |
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