CN1085128A - Concentrating process for coagulating and settling tailings - Google Patents

Abstract

The present invention relates to solid-liquid separation technique, be applicable to the mill tailings dehydration, coal-fired station's coal ash pulp Separation of Solid and Liquid, the Separation of Solid and Liquid of steel plant's chimney cyclone dust removal mortar and the Separation of Solid and Liquid of environment-friendly engineering etc., be characterised in that and designed the high-efficiency cyclone device and selected the KLP flocculant for use, concentrating process for coagulating and settling tailings of the present invention is easy and simple to handle, the reagent consumption amount is few, production cost is low, its compact equipment, floor space is little, efficiently solve the high concentration preparation of mill tailings slurry, problems such as concentrator excess load and overflow water quality inferiority had both been saved the investment of a large amount of capital construction, the running expense of sedimentation and thickening be can reduce again, remarkable economical and social benefit obtained.

Description

Concentrating process for coagulating and settling tailings

The present invention relates to solid-liquid separation technique promptly from suspension with the method for solid phase and liquid phase separation.Be applicable to the mill tailings dehydration, thermal power plant's coal ash pulp Separation of Solid and Liquid, the Separation of Solid and Liquid of steel plant's chimney cyclone dust removal mortar and the industries such as Separation of Solid and Liquid of environment-friendly engineering.

With the ore dressing plant is example: along with the increase of mine tailing amount, concentrator is in the overload operation state, has caused the overflow suspension too high, and requirement is not all satisfied in backwater and discharging, and the tail-mineral pipeline induction system does not reach the conveying requirement because of the increase of mine tailing volume yet.The mine tailing transportation concentration is low excessively to be the ubiquitous problem of iron ore beneficiating factory, and it has expended a large amount of energy and power, has increased the production cost of ore dressing.For solving this difficult problem, the method that adopts has usually:

1. utilize existing concentrator to transform, reinforce concentrator and improve equipment intensity, change underflow ore discharge system, increase measures such as flocculant add-on system.

2. adopt the two-stage concentrating process, rougher tailings and cleaner tailings are carried out dense respectively, realize that promptly one section is densely removed the purpose that thick mine tailing alleviates two sections dense guarantor's overflows.

More than two kinds of methods all be on existing concentrator basis, carry out the transformation of equipment or flow process adjustment and realize the high concentration slurry preparation.Adopt first method, the actual load of concentrator must increase, and concentrator settling area difficulty meets the demands; Adopt second method, carry out relatively difficulty of flow process adjustment, this method also is difficult to obtain ideal effect on existing concentrator basis simultaneously.

At the deficiency of said method, the purpose of this invention is to provide and a kind ofly can reduce concentrator mine-supplying quantity and feed ore concentration, improve sinking speed, widen the mine tailing concentrating process of settling area, to obtain preparation of mine tailing high concentration and qualified overflow water quality; Save a large amount of energy simultaneously, reduce reagent consumption, reduce production costs, prevent the pollution of the environment; The employing of this technology has small investment, the advantage of instant effect.

Above-mentioned purpose of the present invention realizes being to design long cylindrical shell combines with short cone and the mineral-feeding pipe mouth is the involute mode high-efficiency cyclone device and has developed the KLP flocculant.

Fig. 1,2 have described the overall structure of cyclone of the present invention.It is that the conic tube 4 of 120 ° of funnel types joins by cylinder 3 and cone angle; The cylinder 3 upper ends overflow pipe 1 that has been welded, its sidewall is welded and is made up of involute mineral-feeding pipe 2.

Fig. 4 has described the working condition and the principle of cyclone of the present invention, slurry forms spiral helicine circumnutation in cylinder 3, because particle is subjected to the centrifugal inertial force effect, be thrown toward barrel, the result has formed CONCENTRATION DISTRIBUTION radially, more higher near barrel concentration, axially having revolution to flow along cyclone simultaneously exists, downward near barrel place velocity attitude, near center speed upwards, under axial backflow effect, the high density slurry of close barrel slides to cone 4 and is discharged by the desilting mouth, becomes high concentration desilting product; And be with to overflow pipe 2 by upwards refluxing near the lower thin pulp body of the concentration of center, discharge by overfall, so just realized concentrating of slurry.The mobile of slurry is the complex flowfield with space three-dimensional speed in the cyclone, because the rapid circular movement of core slurry has formed low-pressure area (being air column).

As seen: cylinder 3 lengthenings highly increase the rotation of slurry, and the dense time increases, and helps improving sand setting concentration; It is 120 that conic tube 4 cone angles increase, and the relative radius of gyration of particle increases, and helps the sand setting deposition with dense; The short coning stream of long column utensil has the sand setting concentration stabilize, and to giving ore pulp bulk concentration fluctuation adaptability strong, spigot is relatively large, is difficult for advantages such as obstruction; Feed for the ore deposit by the involute mode, reduced by the tangential way (see figure 4) feeding the energy loss that the stronger collision of slurry and barrel causes.

The characteristic of the KLP flocculant of being developed is:

1.KLP the architectural characteristic of flocculant adopts infrared spectrum that this structure is analyzed, analysis result shows that this flocculant is a macromolecular organic compound, its effect group is hydroxyl OH and COC group, do not contain=the C=O group, it is different from the structure of flocculants commonly used such as ketone, ester and acid amides, belongs to novel flocculant.

2.KLP its floc sedimentation characteristic that adds flocculant adopts microphotograph to blank slurry, the pattern that adds polyacrylamide (being considered to the most effective flocculant at present) slurry and add KLP flocculant slurry is taken pictures, so that contrast, the characteristic after can clearly be seen that the distribution of blank slurry particles and add flocculant from image, can reduce following 2 points:

1) blank slurry fine particles, because the particle surface electrical function, the surface has formed one deck hydration shell, so particle is loose condition (of surface) and is distributed in the liquid phase, sinking speed is very low;

2) slurry of adding flocculant, because macromolecular bridging action has formed the big floc sedimentation of fineness ratio scattered seed, finds out from figure, the flock size that adds polyacrylamide is more even, the network-like filling of liquid phase wherein, and it is thicker to add the flock size of KLP flocculant, structure is connection status, liquid phase is not network-like, the difference of these two kinds of floc sedimentation structures has caused different sinking speed, and is wherein very fast with the floc sedimentation sinking speed that adds the KLP medicament.

3. the mine tailing slurry makes the ore deposit amount that enters thickening pond reduce 50～60%, simultaneously after the flocculation of KLP flocculant after cyclone concentrates, sinking speed is higher than the mine tailing slurry again, thereby reduce the thickening pond load greatly, KLP flocculant cost is lower than other flocculants commonly used, the overflow water water quality the best that obtains.In a word, technology of the present invention selects for use its consumption of KLP flocculant few, effective, and cost is low.

Further specify below in conjunction with accompanying drawing:

Fig. 1 is the structural representation of high-efficiency cyclone device of the present invention;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is common cyclone fundamental diagram;

Fig. 4 is a high-efficiency cyclone device fundamental diagram of the present invention;

Fig. 5 is one of process chart of the present invention;

Fig. 5 has described coagulant precipitation concentrating process process of the present invention: mill tailings is that the ore pulp of 12-18% is earlier dense through the high-efficiency cyclone device with the input concentration.After ore pulp enters cyclone from pulp-inlet pipe involute direction, form spiral helicine circumnutation in the cylindrical shell of garden, particle is subjected to the effect of centrifugal inertial force, and coarse granule gets rid of to barrel and slides at the awl end, is discharged by spigot; Because the slurry of cyclone core is made rapid circular movement, form low-pressure area in the hydrocyclone center again, the most of fluid Buddhist monk not fine grained of sedimentation forms the spiral flow that rises, and is discharged by overflow pipe; Sand setting is opposite with the overflow direction of motion, so there is a zero-speed enveloping surface vertically, the flow field in the cyclone is complicated screw for this reason, is three-dimensional motion.With the cylindrical shell lengthening, base cone shortens high-efficiency cyclone device of the present invention on common cyclone basis, and cone angle increases, cylindrical shell lengthening highly increases the rotation of ore pulp, and the dense time is increased, and is dense, classification process is abundant, the ore pulp short circuit is reduced, therefore help improving the concentration of sand setting; Cone angle increases, and the relative radius of gyration of particle increases, and is beneficial to the sand setting deposition with dense; The short awl of long column cyclone also has the sand setting concentration stabilize, and to giving the moving adaptability of ore pulp bulk wave strong, spigot is relatively large again, is difficult for characteristics such as obstruction, and obtaining concentration is 68.18% sand setting, its productive rate be 58.95% and concentration be 6.76% overflow, its productive rate is 41.05%.

The low concentration overflow enters concentrator and adds KLP flocculant coagulant precipitation dense again.Although the effluent concentration through cyclone is lower than mine tailing slurry concentration, but because fine fraction content increases, sinking speed reduces, still can not solve the deficiency of concentrator settling area, therefore, add the KLP flocculant by every cube of Rice ﹠ peanut milk 15 gram consumptions, to increase the sinking speed of cyclone overflow, coagulant precipitation speed is brought up to 7.6 millimeters/minute, is higher than other flocculant coagulant precipitation speed.Thereby reduce concentrator feed ore concentration and load, (overflow water of SS＜500PPM) and concentration are concentrated underflow 40% or more finally to obtain meeting environmental protection standard.Wherein overflow water can concentrate underflow and cyclone sand setting and be merged into the high concentration conveying of line pipe road as recycling water utilization or discharging.When treating capacity is big, adopts many cyclones to constitute the cyclone group and handle.

Concentrating process for coagulating and settling tailings of the present invention has fully shown following advantage in process of production:

Efficient cyclone of the present invention for long cylindrical shell with lack that cone is combined and the mineral-feeding pipe mouth is the involute mode, have thinner than traditional cyclone partition size, the classification efficiency height, dense than high advantage, its sand setting productive rate is 50～60%, and concentration is 58～69%, and effluent concentration is 5.9～9.0%.

2. the KLP flocculant that adopts in the concentrator coagulant precipitation process has, cost more effective than other flocculant Low advantage. KLP flocculant unit consumption: 15 gram/cube Rice ﹠ peanut milks, when unit price was 2000 yuan/tons, its cost was 0.03 yuan of/cube Rice ﹠ peanut milk.

3. because through the water body of coagulant precipitation, its suspension is up to standard to be SS＜500ppm, can make recycling water utilization, if annual recycling water utilization reach Total Water 60% the time, its value is 16.8 ten thousand yuan/year; Discharge simultaneously qualified discharge of water body, eliminated the pollution to environment, then can save 150,000 yuan/year of charges for disposing pollutants every year.

4. concentrating process for coagulating and settling tailings of the present invention is easy and simple to handle, the reagent consumption amount is few, production cost is low, its compact equipment, floor space is little, efficiently solve the high concentration preparation of mill tailings slurry, the problems such as concentrator excess load and overflow water quality inferiority had both been saved the investment of a large amount of capital construction, can reduce again the running expense of sedimentation and thickening, obtain significant economic and social benefit.

Claims (4)

1, a kind of concentrating process for coagulating and settling tailings, its process is: mine tailing concentrates through cyclone earlier, obtain high concentration sand setting and low concentration overflow, the low concentration overflow enters concentrator and adds the flocculant coagulant precipitation dense again, obtain overflow water and concentrated underflow, wherein overflow water can concentrate underflow and cyclone sand setting and be merged into the conveying of line pipe road as recycling water utilization or discharging; It is characterized in that: it is 12～18% that mine tailing advances to starch concentration, sand setting concentration is 68.18%, effluent concentration is 6.76%, and coagulant precipitation speed is 7.6 millimeters/minute, and designed that long cylindrical shell combine with short cone and high-efficiency cyclone device that the mineral-feeding pipe mouth is the involute mode with selected the KLP flocculant for use.

2, high-efficiency cyclone device according to claim 1 is characterized in that: it is that the conic tube 4 of 120 ° of funnel types joins by cylinder 3 and cone angle; The cylinder 3 upper ends overflow pipe 1 that has been welded, its sidewall is welded and is made up of involute mineral-feeding pipe 2.

3, flocculant according to claim 1 is characterized in that: it is a macromolecular organic compound, and its effect group is hydroxyl OH and COC group.

4, flocculant according to claim 3 is characterized in that: its consumption is every cube of Rice ﹠ peanut milk 15 grams.

Images