Mineral Processing
Recently there has been a tendency to use pneumatic methods for the separation of bulk materials. Grains being treated have a different shape, density, coefficient of friction and other properties on which is based the method , which attracts many specialists. For these purposes, mostly dry methods and pneumatic separators of different designs are used.
[3]In the seventies of the last century in domestic practice were applied pneumatic-vibration separators SP-12, SP-6, SPB-100G, which belong to the machines of fan (semi-direct flow) type.
In foreign practice for dry concentration were used separators "SuperAirFlo" (USA), and separators firms "Wedag" and "Humboldt" (Europe). The disadvantages of these machines include low efficiency of the subdivision of grains through mutual clogging foods that are caused by the movement of the material to the place of unloading in the general stream. Counter-current separators provide a more accurate division in comparison with straight-through.
This trend is developing successfully in Australia, Russia, Kazakhstan, the USA, Japan and China. In China 150 plants of dry processing are operating today, which processed more than 50 million tons of raw coal. In Russia - about 17 plants in Ukraine - 8.
A construction for pneumatic separator type SVP-5, 5x1, as the main processing unit, owned by the general development of scientists and engineers (Design Bureau of the coal plant Mechanical Engineering named by O. Parkhomenko, Lugansk; leading experts DP "Ukrvugleyak³st", members of the department "Mineral processing", Donetsk National Technical University; specialist of "Quality Plus").
[2]The raw material base is granular carbonaceous materials that are delivered to the industrial site.
Qualitative characteristics of raw materials, which is recycled, (according to pneumatic separator process parameters) are: bulk density of not more than 2.8 t/m3, the surface moisture to 8%.
Performance and operation are set according to the design task.
Based on the mode of operation and performance of the installation sifter production capacity of processing adopted the following points:
Commodity production class 0-75mm after processing will be used as an energy feedstock.
Technological scheme of bulk carbonaceous materials (Fig. 1.1) adopted the task to design, source data for the design and presented the following operations:
Pneumatic separator SVP-5, 5x1 made by "Lugansk Machine-Building Plant. OY PARKHOMENKO "and intended for air enrichment of medium coal, ores, and other loose bulk material of density up to 2.8 t/m3 (humidity of 8.0%) and coreness up to 75 mm.
The separator design allows to carry out depending on the characteristics of the separated material, different schemes of work with the division into two or three products: concentrate, middlings and tailings.
The type and amount of equipment for the processing of coal taken respectively on the design problem:
Technological equipment reception and classification of raw coal processing delivers the performance 50t / d, respectively, adopted for the design problem
Type and quantity of equipment for the processing of coal taken respectively on the design problem:
- pneumatic separator SVP-5, 5x1-1 unit;
- ID fan DN-17-1 pc;
- fan VDNu-12 ,5-1 unit;
- Cyclone CN-24-1 pc;
- crashing GIL-52A (GIL-1, 5 x 2-D) - 1 pc.
process equipment reception and classification of raw coal processing delivers the performance 50t / d, respectively, adopted for the design task.
Technical characteristics of pneumatic separator SVP-5, 5x1
working area - 6.7 m 2 ;
nominal width of the deck - 1.42 g. Performance on original material (including the circulating load) - 50 t / d Size of separated material - up to 75 mm error division (at maximum capacity) - no more than 0,25
range of controlled and regulated frequency sweep deck - 5,0-6,67 Hz (min-1) (300-400) dimensions, years, no more: - length 6450; - width 3906; - height 7750.
specific electricity consumption - 490 kJ / m Weight - no more than 12,570 kg Controller power consumption - no more than 0.5 kW dynamic loads transmitted to the building construction through the support cage, book, no more: - vertical - 8; - horizontal - 6. Calculation of enrichment expect the balance of dressing products made on the basis of experimental studies. Composition and technological complex situation plan item processing adopted with a view to ensuring continuous operation of all parts of the technological scheme for handling, preparation, enrichment, shipping commercial products, and waste and seasonal regime of the enterprise. Technological complex item processing has the following buildings and facilities: - flyovers scraper conveyor; - point for raw coal; - classification item; - installation of a pneumatic separator; - the point of loading of concentrate; - trestle # 1,2,3,4,5. Komponovanie structures technological complex item processing provides free on-site driveways and entrances mobile hoisting equipment for repair work. technical solutions adopted in the working draft, provide: - receiving bulk carbonaceous materials from motor vehicles; - the transfer of bulk carbonaceous materials scraper conveyor to a receiving station; - accumulation of carbonaceous materials in bulk hopper capacity of 30 tons; - the transfer of bulk carbonaceous materials by conveyor belt to the point of classification; - control the classification of bulk carbonaceous materials in the din; - the transfer of Class 0-75mm belt conveyor installation sifter; - transport class 75 mm conveyor belt to load in the vehicle, if any in the original coal-class 75 mm; - enrichment class 0-75mm in a pneumatic separator; - transported by conveyor belt to concentrate the load point; - accumulation of concentrate in the hopper capacity of 30 tons with a load of vehicles; - transporting tailings conveyor belt to load in the vehicle. Gravity lowland bulk material density fractionation is carried out in air in the pneumatic separator type SVP-5, 5x1-1pc. The separator is designed for coal, ore and other bulk materials bulk density up to 2.8 t / mup> 3 with a moist surface to 8%, size up to 75mm. After the separator is based on dividing the coal mineral particles and their intergrowths density under the influence of the air flow and mechanical shaking off. separator design provides, depending on the characteristics of the separated material, the different circuits of the division into two or three products: concentrate, middlings and tailings. Technological scheme adopted for the design of the task, respectively, it is assumed division into two products: concentrate and tailings. For persistent qualitative enrichment and minimum loss of carbonaceous waste fractions in the enrichment provided on the installation sifter bunker that accumulates capacity of 15 tons. For unloading from hopper feeders are provided an installation of PK-1 ,2-8, 0, which ensures uninterrupted and uniform supply of coal Class 0-75mm in the air separator. When enrichment of coal in the separator material is received on trays on the deck box separator. Under the influence of intense shaking off created by the swing of a box and a rising pulse jet air layer separated material loosened and stratified by density. The lightest fractions are concentrated in the upper layers, tailings - in the lowest strata "bed." Concentrate, which is in the upper layers, moving much faster recovery, which are located below, not staying on the corrugated deck. Due to the transverse inclination and deck action of the air, the concentrate slipping laterally into the receiving funnel. Tailings, which are located in the lower stratum, "bed", due to the action delays the screen and grooved deck, move to the front part of the deck and are discharged into the funnel. The unloading of the air duct particles that woke up through the screen is stipulated screw discharger to the gate. separator is designed to enrich the air in the environment, coal, ores, and other loose materials to the bulk density of 2.8 t/m3 to wet the surface to 8%, of size up to 75mm. separator design allows to carry out depending on the characteristics of the separated material in different schemes of work with the division into two or three products - concentrate, middlings and waste. separators can be used in the schemes of a new type of processing enterprises, as well as the reconstruction of existing enrichment facilities in non-hazardous areas Class P-11a. The separators are made for conditions UHL4 for GOST 15150-69. Separator is designed for use in explosion-proof areas and other enrichment modules at altitudes above sea level no more than 2,500 g at a temperature from -40 ° C to 45 ° C and humidity of raw coal is not more than 8%. Technical data separator SVP-5.5h1 - The working area of ??the division - 6.7 m 2 ; - nominal width of the deck - 1.42; - Performance on the source material (including circulating load) - 50 t / d - Size of the separated material - up to 75 years - Error division (at maximum capacity) - no more than 0.25 - Range of controlled and regulated frequency sweep deck - 5,0-6,67 Hz (min-1) dimensions, years, no more: - length 6450; - width 3906; - height 7750.
Job separator on the basis of the division of coal and mineral particles and their splice density under the influence of air flow and mechanical shaking off. basic component of the separator is the box office, on the deck of which the whole process of enrichment. mounted on the rotary frame with supports is reciprocated by a crank drive mechanism, also mounted on the rotatable frame. Number swings box is controlled by the drive. frame separator located air duct, designed to create a pulsating flow of air upward. longitudinal deck angle is performed using the lifting mechanism When enrichment of coal feedstock supplied on trays on the deck boxes. Under the influence of intense shaking off created by the swing of a box and a rising pulse jet air layer enriched coal loosened and stratified by density. This yields the following products enrichment: concentrate, middlings and waste. The fractions of coal, lighter, concentrated in the upper layers, an intermediate - an average of tailings - in the lowest strata "bed». Movement "bed" on the deck span is determined by the nature of the boxes, angles of inclination. concentrate, which is at the top, moves faster layers located below the deck without stopping riffles, and thanks to the transverse angle of the deck and to the open air slipping laterally into the receiving funnel. Intermediate is located in the middle board "bed" and by friction of grains on the upper and lower plasts "bed" and retards the action riffles the deck, moving slowly and concentrate is discharged into the receiving hopper at some distance from the place of discharge of the concentrate. tailings, which are at the very bottom board "bed", located between the middling and screen. Due to delays the action of the sieve and riffles the deck, move slower middlings and unloaded in the front part of the deck into the funnel thickness "bed" on the deck adjustable mechanical corrugated boxes. For unloading of particulate air duct, which awoke a sieve, screw discharger applied to the gate. To clean the dust circulating in the air system of the process air in a spiral separator cyclone separator air flow from process blower, and passes through the air separator pulsators under deck. The main part of the air (80%) it passes again through obezpylivanie Technology fan deck comes under the separator. Part of the air, which remained, obezpylivaetsya in a cyclone and an exhaust fan vykidaetsya into the atmosphere. Ability to work with existing schemes separator dust collection, in which case the spiral separator dust separator is not completed. avoid dust emission in the room provided for curtains that cover the box separator. In the viewing window blinds is to oversee the work of the separator. lubrication of bearing units, respectively, the separator is a map lubrication. enrichment product quality provided the oscillation frequency control box separator and feeder performance depending on the pressure of the process air by the first and third fields deck. The device working principle and other information necessary for the use of the control system are listed in the manual operation of the SVP-5, 5h1.02.000RE. 1 - snail, which spins a 2 - pipe, 3 - Fan 12.5, 4 - dust separator, 5 - spur, 6 - separator SVP - 5,5 x1, 7 - umbrella, 8 - Bunker 9 - boot tray , 10 - Feeder PC-1 ,2-8, 0, 11 - steel construction, 12 - cyclone, 13 - the overview window, 14 - receiving cones, 15 - the air, 16 - unloader, 17 - platform, 18 - smoke pump DN17, 19 - Front, 20 - dispenser, 21 - steel construction, 22 - frame, 23 - pulser, 24 - funnel pedigree, 25 - pipeline.
2.2 Layout solutions
Flow chart of processing of raw coal
Coal Class 0-75mm.
Description and robot device SVP-5, 5x1
The structure and operation of the separator
[1]
2.3 Description and operation of the SVP-5,5x1
[2]
Picture 1 – Animation of the material is subjected to the impact of the rising air stream (volume 28 KB, 8 frames, the delay between frames 0.5 MS)
Picture 2 – Animation of the material is exposed to mechanical shaking (volume 33 KB, 4 frames, the delay between frames 0.5 MS)
Source List
