CN109107752B - Dry treatment method of bauxite tailings - Google Patents
Dry treatment method of bauxite tailings Download PDFInfo
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- CN109107752B CN109107752B CN201811248980.1A CN201811248980A CN109107752B CN 109107752 B CN109107752 B CN 109107752B CN 201811248980 A CN201811248980 A CN 201811248980A CN 109107752 B CN109107752 B CN 109107752B
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- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims description 33
- 239000004576 sand Substances 0.000 claims abstract description 42
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 35
- 239000010703 silicon Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005406 washing Methods 0.000 claims abstract description 23
- 239000000047 product Substances 0.000 claims abstract description 21
- 239000012065 filter cake Substances 0.000 claims abstract description 13
- 239000000706 filtrate Substances 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 10
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 238000003672 processing method Methods 0.000 claims abstract description 6
- 239000008394 flocculating agent Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 230000008719 thickening Effects 0.000 claims abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 59
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 34
- 239000002245 particle Substances 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 17
- 230000007246 mechanism Effects 0.000 claims description 12
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 230000018044 dehydration Effects 0.000 description 12
- 238000006297 dehydration reaction Methods 0.000 description 12
- 208000028659 discharge Diseases 0.000 description 12
- 238000003860 storage Methods 0.000 description 12
- 230000008901 benefit Effects 0.000 description 9
- 239000002562 thickening agent Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 239000000741 silica gel Substances 0.000 description 6
- 229910002027 silica gel Inorganic materials 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
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- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- Manufacture And Refinement Of Metals (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a dry processing method of bauxite tailings, which comprises the steps of feeding ore washing tailings into a first cyclone group for cyclone separation to obtain first coarse sand and first overflow; screening the first coarse sand to obtain a first undersize product and a first oversize product; feeding the first undersize product and the first overflow into a second cyclone group, and performing cyclone separation to obtain a second overflow and second coarse sand; feeding the first oversize product and the second coarse sand into a desiliconization machine, and removing silicon to obtain a third overflow and third coarse sand; screening the third coarse sand to obtain a second undersize product and a second oversize product; carrying out thickening treatment on the third overflow, the second overflow and the second undersize to obtain a fourth overflow and an underflow; adding a flocculating agent into the underflow, mixing uniformly, and filtering to obtain filtrate and a filter cake. The invention recovers useful minerals from the tailings after washing, and improves the comprehensive utilization rate of resources; finally, the washing tailings are dehydrated, the filtrate returns to washing for recycling, and the filter cake is used for backfilling the goaf, so that water resources and land resources are saved.
Description
Technical Field
The invention belongs to the technical field of mining industry, and relates to a dry method treatment method of bauxite tailings.
Background
At present, the ore washing tailing mud of the karst accumulation type bauxite is basically discharged by a wet method, namely, the tailing mud with the water content of about 70 percent is discharged into a tailing pond for storage after the ore washing tailings are settled and concentrated by a thickener. The tailing treatment mode is generally called as a 'wet process' (common sedimentation and concentration technology is adopted), and is characterized by high water content of final tailings, large stockpiling amount and high environmental protection risk. The production of a large amount of tailing mud not only needs the storage of a tailing pond with enough storage capacity; moreover, the risk of leakage and dam break of the tailings stock is always the heart of mine and peripheral production, ecology and life and property safety. In addition, with the continuous expansion of the production scale of mines, the accumulated amount of tailings is increased day by day, the pressure for treating the tailings is increased day by day, and the contradiction between the production of the mines and the treatment of the tailings is highlighted day by day.
In the existing bauxite tailing dry processing technology, plate-and-frame filter pressing is the only currently applied technology, and due to the fact that the technology is high in energy consumption, low in processing efficiency and high in production cost, lime powder is required to be added to serve as a filter aid, a filter cake is weak in alkalinity, and the method is not very beneficial to subsequent biological reclamation of a backfilled goaf, and therefore the method cannot be applied and popularized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a dry method treatment method of bauxite tailings, which improves the comprehensive utilization rate of the tailings and realizes the dry discharge of the bauxite tailings.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a dry treatment method of bauxite tailings comprises the following steps:
s1, feeding the tailings after ore washing into a first cyclone group for cyclone separation to obtain first coarse sand and first overflow;
s2, screening the first coarse sand to obtain a first undersize product with the particle size of less than 200 meshes and a first oversize product with the particle size of not less than 200 meshes;
feeding the first undersize and the first overflow obtained in the S1 into a second cyclone group, and performing cyclone separation to obtain a second overflow and second coarse sand;
s3, feeding the first oversize product and the second coarse sand into a desiliconization machine, and removing silicon to obtain a third overflow and third coarse sand;
screening the third coarse sand to obtain a second undersize product with the particle size of less than 500 meshes and a second oversize product with the particle size of not less than 500 meshes;
performing thickening treatment on the third overflow and the second undersize obtained in the S2 to obtain a fourth overflow and an underflow;
s4, adding a flocculating agent into the underflow obtained in the S3, uniformly mixing, and filtering to obtain filtrate and a filter cake.
In the invention, the ore washing tailings are separated by the first cyclone component, and the recovery rate of coarse sand with the particle size not less than 200 meshes can reach more than 90 percent; then, screening the obtained first coarse sand, sending the obtained first undersize and the obtained first overflow into a second cyclone group, and carrying out cyclone separation treatment, wherein the coarse sand with the particle size not less than 500 meshes can be effectively recovered in the process (the recovery rate can reach more than 75%); the second oversize can be directly sent to a sand storage yard for storage; the fourth overflow is rigorously returned to the ore washing procedure for recycling; the filter cake can be backfilled into a goaf or sent to an ore sand storage yard for storage, so that the dry discharge of bauxite tailings is realized while the comprehensive utilization rate of the tailings is improved, and a tailing wet storage mode which is not beneficial to environmental protection is replaced.
The desiliconization machine removes the fine silicon mud and the silica mixed in the ore sand according to the density and the weight difference of the materials, thereby improving the quality of the ore sand.
The particle size of solid particles in the washing tailings is not more than 1 mm.
The first cyclone group is an MS-400 cyclone group, and the processing capacity of the MS-400 cyclone group is more than or equal to 800m3H; the second cyclone group is an MS-800 cyclone group, and the processing capacity of the MS-800 cyclone group is more than or equal to 800m3/h。
In S2 and S3, the screening process is performed by a vibrating screen.
In S4, the mixture was filtered through a belt filter.
Further, in S4, the flocculant is a modified flocculant, further, the modified flocculant is cationic polyacrylamide, the relative molecular weight of the modified flocculant is more than 800 ten thousand, the cationic degree is more than or equal to 10%, and the dissolving time is less than or equal to 60 minutes.
In S4, the dense fine tailing mud particles in the underflow are changed into loose large floccules by utilizing a modified flocculant through a pipeline mixer and a stirring tank, the water permeability of the slime is improved, then the slime enters a filter for three-stage dehydration, the filtrate returns to an ore washing process for recycling, filter cakes (the water content is less than or equal to 35 percent) of the filter backfill a goaf, and the dry discharge of tailings is realized while water resources are saved.
Furthermore, in the three-stage dehydration process, the first stage dehydration is filter belt normal pressure dehydration, and the second stage and the third stage are filter belt matched roller extrusion dehydration processes, so that the process is low in energy consumption and continuous in discharging.
And returning the filtrate of the filter to the ore washing process for recycling, and backfilling a filter cake into the goaf to realize dry discharge and zero discharge of bauxite tailings on slime.
Further, the silicon removing machine comprises a material box, a feeding mechanism for feeding materials in the material box into the silicon removing box, a plurality of silicon removing boxes and an eccentric driving mechanism for driving the silicon removing boxes to eccentrically swing, wherein an ore bed layer and a sieve plate layer which are distributed up and down are arranged in each silicon removing box, and a discharge hole is formed in the bottom of each silicon removing box; the silicon removing device also comprises a water inlet pipe used for supplying water to the silicon removing tank. Preferably, the inlet tube stretches into except that the silicon incasement, and the part of stretching into of inlet tube has seted up a plurality of holes upwards, and water gets into each except that silicon case like this, forms upwards rivers. Further preferably, the water inlet pipe is arranged below the sieve plate layer to obtain a good treatment effect.
Further, the number of the silicon removing boxes is at least 2, the feeding mechanism comprises a discharging pipe communicated with the material box, and the bottom end of the discharging pipe is communicated with a material distributing groove used for distributing materials into the silicon removing boxes.
Furthermore, the device also comprises an overflow trough for receiving overflow products which are obtained by removing overflow products in the silicon box.
Furthermore, the eccentric driving mechanism comprises a driving rod which is rotatably connected with the silicon removing box, and one end of the driving rod is fixed on the eccentric wheel. Preferably, the device further comprises a driving motor, and an output shaft of the driving motor is in transmission connection with the eccentric wheel.
Furthermore, the device also comprises a collecting tank communicated with the discharge hole, and bauxite particles after the silicon sludge and the silica are removed are collected.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention skillfully utilizes the combination of the cyclone and the vibrating screen to recover the fine-particle bauxite with more than 500 meshes in the tailings after ore washing, the recovery rate of the bauxite can reach 78.43 percent (the particle size is more than 500 meshes of the bauxite), the recovery particle size of the bauxite is reduced from 0.30mm to 0.03mm, and the comprehensive utilization rate of resources is correspondingly improved.
2. The invention utilizes the density and weight difference of different materials to originally form a physical desiliconization device for ore sand (the structural schematic diagram is shown in figure 2), which effectively removes the fine slime and silica mixed with the recovered ore sand, the desiliconized slime content is less than or equal to 5wt percent, and SiO is contained2The content is reduced from about 18wt% to within 12wt%, and the recovery of ore sand can be effectively improvedAnd (4) quality.
3. The invention skillfully utilizes the flocculating agent to change compact fine tailing mud particles into loose large floccules, which is beneficial to the filtration and dehydration of the tailing mud.
4. The dehydrated tailing mud has the water content of less than or equal to 35 percent and no fluidity, can be used for backfilling a goaf, changes the wet stockpiling of a tailing pond of the tailing mud into dry disposal, and has obvious safety and environmental protection effects.
5. The energy consumption of filtration and dehydration is low: compared with the traditional plate-and-frame filter pressing dehydration process, the unique belt type filtration process has low dehydration energy consumption, and the energy consumption for treating the equivalent bauxite tailing mud is only about 30 percent of that of plate-and-frame filter pressing.
6. And (3) water resource saving: the filtrate after filtration and dehydration is returned to the ore washing process for recycling, and compared with a tailing mud wet discharge mode, 158 million tons of new water can be saved for every 100 million tons of tailing mud.
7. Providing a reclamation soil source: the tailing mud does not need to be stockpiled in a tailing pond, so that sufficient soil resources can be provided for reclamation of a goaf in open-pit mining, and land resources are relatively saved.
Drawings
Fig. 1 is a flow diagram of a process for dry treatment of bauxite tailings in accordance with a first embodiment of the present invention.
Fig. 2 is a schematic structural view of a silica remover used in the dry processing method of bauxite tailings according to the first embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. For the sake of convenience of the description,
in the embodiment, the ore washing tailings (-1 mm, the solid content is 13%) are firstly led into an MS-400 cyclone group by using a pipeline and a slurry pump, coarse sand enters a 1# vibrating screen, the overflow of the MS-400 cyclone group and the slurry below the vibrating screen 1 are led into an MS-800 cyclone group, the coarse sand produced by the MS-800 cyclone group and the oversize product of the 1# vibrating screen enter a desiliconization machine, the coarse sand produced by the desiliconization machine is dehydrated by a 2# vibrating screen and then is transported to a storage yard by a belt conveyor, and the overflow of the MS-800 cyclone group and the desiliconization machine and the undersize product of the 2# vibrating screen are led into a thickener.
Remove the silica gel machine including set up workbin 1 in frame 12, be used for sending into the material of workbin and remove feeding mechanism, a plurality of silica gel case 7 that remove in the silica gel case 7, be used for ordering about and remove silica gel case 7 and be eccentric wobbling eccentric actuating mechanism, remove the ore bed layer 4 (bottom filtering layer) that is equipped with upper portion ore sand and friction, filtering action in the silica gel case 7 and distribute from top to bottom, sieve layer 6 bottom is equipped with inlet tube 5, and the bottom of removing silica gel case 7 is equipped with discharge gate 8. The quantity of removing silicon case 7 is 2 at least, feeding mechanism includes the unloading pipe 2 with the workbin intercommunication, and the bottom intercommunication of unloading pipe 2 has the branch silo 3 that is used for dividing the material into each removes silicon case 7. And an overflow trough 13 for receiving overflow from the silicon tank 7. The eccentric driving mechanism comprises a driving rod 10 which is rotatably connected with the silicon removing box 7, and one end of the driving rod 10 is fixed on an eccentric wheel 11. And the device also comprises a collecting tank 9 communicated with the discharge hole 8.
Silicon removal process: before the silicon removing machine starts to work, a valve of the water inlet pipe 5 is opened firstly, the silicon removing box 7 driven by the driving rod 10 and the eccentric wheel 11 is started, and then mud-containing coarse sand in the material box 1 is uniformly fed into a material layer liquid level 14 of the silicon removing box 7 through the discharging pipe 2 and the material distributing groove 3. The silicon removing box 7 continuously eccentrically swings, water flow in the silicon removing box upwards, silicon mud and silica with smaller density float upwards along with the water flow by utilizing the density or weight difference of materials, and the silicon mud and the silica enter the overflow groove 13 and are guided into the thickener; when bauxite particles with high density pass through an ore bed layer 4 (mainly comprising bauxite with the particle size of 8-10 mm), adhered silicon mud is further removed, then the bauxite particles are screened by a screening plate layer 6 (the size of a screen hole of a screen plate is proper, and when the size is smaller, the recovered sand can run off along with overflow, and when the size is larger, the ore bed layer can be consumed too fast, and the ore bed layer loses support, friction and filtering effects, the applicant repeatedly tests show that when the size of the screen hole is 10 x 5mm, the bauxite particles with the silicon mud and the silica removed are proper and have good effects, and the bauxite particles are gathered into a collecting tank 9 through a sand outlet 8 and are pumped into a vibrating screen for dehydration, so that the desiliconization process of mud-containing coarse sand is completed. After the silicon removal, the sludge content in the fine-grained bauxite is reduced from 20wt% to 5wWithin t%, SiO2The content is reduced from about 18wt% to within 12 wt%.
The slurry settled and concentrated by the thickener is guided into a storage tank and a stirrer through a pipeline mixer, under the action of the modified flocculant, the fine slurry is changed into relatively loose floccules, the floccules are dehydrated through three sections of the filter, the overflow of the thickener and the filtrate of the filter return to the ore washing process for recycling, the filter cake (the water content is less than or equal to 35 percent) of the filter is backfilled into a goaf, and the dry discharge of tailings is realized while water resources are saved.
And (3) benefit analysis:
in the existing bauxite tailing wet discharging treatment process, tailing slurry (32 wt%) settled and concentrated by a thickener is pumped to a tailing pond by a slurry pump for storage; even if the tailing pulp is settled and drained in the process of stockpiling of the tailing pond, the tailing pulp still has obvious fluidity, so that the tailing pulp cannot be used for backfilling a goaf and can only be permanently stockpiled in the tailing pond. During the tailing stockpiling period, in order to ensure the safe operation of a tailing pond, certain capital needs to be invested every year to maintain and manage the tailing pond; therefore, the tailings wet discharge cost mainly comprises the land acquisition and construction cost (apportionment) of a tailings pond, the tailings transportation cost (equipment and facility construction and maintenance, power consumption, labor force and the like), the tailings pond maintenance and treatment cost and the like, and the wet discharge treatment cost is about 22.30 yuan/ton-dry tailings.
The dry method for treating the bauxite tailings does not need to build a tailings pond, the bottom flow of the thickener is filtered and dehydrated, the filtrate returns to the ore washing process for recycling, and the filter cake is transported to a goaf to be refilled or stockpiled to a temporary storage yard by using a dump truck. Considering the investment and depreciation of dehydration plants and equipment, the consumption of flocculating agent, the operation cost, the labor, the transportation of filter cakes and the transportation cost, deducting the benefit of ore sand recovery and the benefit of filtrate recycling, the dry discharge treatment cost of the bauxite tailings is 21.65 yuan/ton, and the dry tailings is reduced by 2.91 percent compared with the wet discharge cost.
1. And (3) economic benefit analysis:
(1) after the scheme of the invention is tried in a certain aluminum ore mountain in Guangxi, about 12 ten thousand tons of ore sand (fine particle bauxite) is recycled every year (the water content is less than or equal to 15wt%, and the product obtained by desiliconization is the ore sand), the price of the fine particle bauxite (A/S: 4-7) is calculated according to 85 yuan/ton (dry ore), and the annual operation cost of an ore sand recycling and desiliconization system is about 550 ten thousand yuan.
The return of bauxite ore sand is recovered every year: 12 × 1-15% 85-550 = 317 ten thousand yuan.
After the ore sand in the ore washing tailings is recovered, the abrasion degree of the pipeline, the underflow pump and the mud pump impeller is effectively reduced, the replacement period is prolonged by 50 percent compared with the original period, and the spare part and material cost is saved by 80 ten thousand yuan each year.
(2) 250 ten thousand tons of mine produced tailing mud and 32wt% of solid content of underflow of a thickener are dehydrated by a filter to form a filter cake with the water content of less than or equal to 35wt%, and filtrate returns to the ore washing procedure for recycling, so that the ore washing procedure saves new water year by year: 396.6 ten thousand tons, and the unit price of fresh water is calculated according to 1.0 yuan/ton.
Saving the new water benefit of ore washing every year: 396.6 x 1.0 = 396.6 ten thousand yuan
(3) The direct economic benefit is generated every year: 317.0+80.0+396.6 = 793.6 ten thousand yuan, and the direct economic benefit is remarkable.
2. Social benefits
After the process is adopted, the bauxite washing tailings become filter cakes capable of being used for backfilling the goaf, so that sufficient soil sources are provided for reclaiming the goaf in open-pit mining, and land resources are relatively saved; meanwhile, the slime produced in the bauxite production process does not need to be stockpiled in a tailing pond, so that the safety risk of leakage of the tailing pond is well eliminated, the positive significance on promoting the safety and environmental protection of the periphery of a mining area is achieved, and the social benefit is remarkable.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (10)
1. A dry processing method of bauxite tailings is characterized by comprising the following steps:
s1, feeding the tailings after ore washing into a first cyclone group for cyclone separation to obtain first coarse sand and first overflow;
s2, screening the first coarse sand to obtain a first undersize product with the particle size of less than 200 meshes and a first oversize product with the particle size of not less than 200 meshes;
feeding the first undersize and the first overflow obtained in the S1 into a second cyclone group, and performing cyclone separation to obtain a second overflow and second coarse sand;
s3, feeding the first oversize product and the second coarse sand into a desiliconization machine, and removing silicon to obtain a third overflow and third coarse sand;
screening the third coarse sand to obtain a second undersize product with the particle size of less than 500 meshes and a second oversize product with the particle size of not less than 500 meshes;
performing thickening treatment on the third overflow and the second undersize obtained in the S2 to obtain a fourth overflow and an underflow;
s4, adding a flocculating agent into the underflow obtained in the S3, uniformly mixing, and filtering to obtain filtrate and a filter cake.
2. The process for dry treatment of bauxite tailings of claim 1, wherein the solid particles in the washed tailings have a particle size of not more than 1 mm.
3. The dry processing method of bauxite tailings of claim 1, wherein the first cyclone group is an MS-400 cyclone group, and the processing capacity of the MS-400 cyclone group is not less than 800m3H; the second cyclone group is an MS-800 cyclone group, and the processing capacity of the MS-800 cyclone group is more than or equal to 800m3/h。
4. The dry processing method of bauxite tailings according to claim 1, wherein in S2 and S3, the screening process is performed by a vibrating screen.
5. The process for dry treatment of bauxite tailings, according to claim 1, wherein in S4, the filtering is performed by a belt filter.
6. The dry treatment method for bauxite tailings according to any one of claims 1 to 5, wherein the desiliconization machine comprises a bin (1), a feeding mechanism for feeding the materials in the bin into the desiliconization tank (7), a plurality of desiliconization tanks (7), and an eccentric driving mechanism for driving the desiliconization tanks (7) to eccentrically swing, wherein ore bed layers (4) and sieve plate layers (6) which are distributed up and down are arranged in the desiliconization tanks (7), and the bottoms of the desiliconization tanks (7) are provided with discharge holes (8); also comprises a water inlet pipe (5) for supplying water into the silicon removing tank (7).
7. The dry processing method of bauxite tailings according to claim 6, wherein the number of the desiliconization tanks (7) is at least 2, the feeding mechanism comprises a blanking pipe (2) communicated with the bin, and the bottom ends of the blanking pipes (2) are communicated with distributing grooves (3) for distributing materials into the desiliconization tanks (7).
8. The process for the dry treatment of bauxite tailings according to claim 6, further comprising an overflow launder (13) for receiving overflow from the silica box (7).
9. The dry process for the treatment of bauxite tailings according to claim 6, wherein the eccentric drive mechanism comprises a drive rod (10) rotatably connected to the desilication tank (7), one end of the drive rod (10) being fixed to the eccentric (11).
10. The process for the dry treatment of bauxite tailings, according to claim 6, further comprising a collection tank (9) in communication with the discharge outlet (8).
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| RO114238B1 (en) * | 1990-10-03 | 1999-02-26 | Emil Fechete | Process for revaluating siliceous bauxites |
| CN1403205A (en) * | 2001-09-11 | 2003-03-19 | 北京矿冶研究总院 | Bauxite dressing method |
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