CN112408343A - Processing system of low-grade ground phosphate rock pelletizing - Google Patents
Processing system of low-grade ground phosphate rock pelletizing Download PDFInfo
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- CN112408343A CN112408343A CN202110019468.5A CN202110019468A CN112408343A CN 112408343 A CN112408343 A CN 112408343A CN 202110019468 A CN202110019468 A CN 202110019468A CN 112408343 A CN112408343 A CN 112408343A
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- belt conveyor
- rubber belt
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- storage tank
- mixer
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- 239000002367 phosphate rock Substances 0.000 title claims abstract description 45
- 238000012545 processing Methods 0.000 title claims abstract description 12
- 238000005453 pelletization Methods 0.000 title description 15
- 239000008188 pellet Substances 0.000 claims abstract description 96
- 239000000463 material Substances 0.000 claims abstract description 73
- 238000003860 storage Methods 0.000 claims abstract description 72
- 239000000428 dust Substances 0.000 claims abstract description 68
- 239000000843 powder Substances 0.000 claims abstract description 44
- 238000001816 cooling Methods 0.000 claims abstract description 42
- 238000012216 screening Methods 0.000 claims abstract description 35
- 238000001035 drying Methods 0.000 claims abstract description 30
- 238000003825 pressing Methods 0.000 claims abstract description 23
- 239000011230 binding agent Substances 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000002360 preparation method Methods 0.000 claims abstract description 16
- 238000005303 weighing Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 32
- 230000005484 gravity Effects 0.000 claims description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 13
- 239000003546 flue gas Substances 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000000779 smoke Substances 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000002390 adhesive tape Substances 0.000 claims description 5
- 230000008676 import Effects 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 5
- 238000004378 air conditioning Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 22
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 description 14
- 239000002994 raw material Substances 0.000 description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 229910019142 PO4 Inorganic materials 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 9
- 235000021317 phosphate Nutrition 0.000 description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 8
- 239000010452 phosphate Substances 0.000 description 8
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 7
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000007767 bonding agent Substances 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/01—Treating phosphate ores or other raw phosphate materials to obtain phosphorus or phosphorus compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
- B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a processing system of low-grade phosphate rock powder pellets, which comprises a material preparation unit, a material mixing unit, a pellet pressing unit, a drying and cooling unit and a dust removal unit, wherein the material preparation unit comprises a powder storage tank and a binder storage tank, a screw feeder is arranged below the powder storage tank, and a first rubber belt conveyor is arranged below the screw feeder; the mixing unit comprises a first mixer and a second mixer; the ball pressing unit comprises at least 2 buffer tanks arranged side by side, a disc feeder, a weighing belt scale and a ball pressing machine are arranged below each buffer tank, a third rubber belt conveyor is arranged below the ball pressing machine, and a pellet strength detector, a first vibrating screening machine and a fourth rubber belt conveyor are arranged below the third rubber belt conveyor; and the drying and cooling unit comprises a tower type dryer, a second vibrating screening machine, a fifth rubber belt conveyor, a second vibrating screen, a cooler and a finished product warehouse. The system has the advantages of reasonable structural design, high production efficiency, high capacity, stable and reliable pellet quality and the like.
Description
Technical Field
The invention belongs to the technical field of phosphorus chemical industry, and particularly relates to a processing system of low-grade powdered rock phosphate pellets.
Background
Yellow phosphorus is an important chemical raw material and is used as raw materialThe produced various phosphides and phosphates have various varieties and wide application. The preparation of phosphoric acid from yellow phosphorus is one of the production processes of phosphoric acid, namely, thermal phosphoric acid. The hot-process phosphoric acid has wider application than wet-process phosphoric acid, can produce feed-grade, food-grade and electronic-grade fine phosphate products, and has the advantage of producing high-end phosphate products. The wet-process phosphoric acid contains more impurities and is difficult to produce food-grade and electronic-grade phosphate products, so the yellow phosphorus has an important market position. High-grade lump ore is needed for producing yellow phosphorus, however, after being mined for many years in China, a few rich lump ores for producing yellow phosphorus are left, and the production requirement of yellow phosphorus is difficult to meet. According to the statistics of resource reserves, the national phosphorite resource reserve is about 18.9 hundred million tons, the basic reserve is 39.02 million tons, and the national phosphorite resource reserve is mainly distributed in five provinces of Yunnan, Guizhou, Hubei, Sichuan, Hunan and the like. With W (P)2O5) The balance is that the overall grade of the phosphorite resource in China is low, and more than 90 percent of phosphorite is P2O5Less than 30% of middle and low grade ore, P2O5More than 30 percent of rich ore only accounts for about 8 percent of the total reserve volume, and the phosphate ore with the grade lower than 25 percent accounts for 78.57 percent of the total amount of the phosphate ore, namely more than 90 percent of the phosphate ore in China is medium-low grade phosphate ore, and the average grade is only about 17 percent. Along with the continuous and rapid development of phosphorus chemical industry, the mining intensity of high-grade phosphate rock is continuously increased, and along with the massive mining of phosphate rock resources, especially the common use of the poor-yield and rich-yield mining method and the inexhaustible mining technology, the waste of the phosphate rock resources is caused, so that P is enabled2O5The rich ore with the mass fraction of more than 30 percent is rapidly exhausted, and the rapid consumption of the rich ore leads the crisis of the phosphorite to be prominent. At present, a large amount of powder ore can be generated in the processing and using processes of high-grade phosphorite for yellow phosphorus, particularly weathered phosphorite, the pulverization rate is usually about 20 percent, and some of the powder ore can reach more than 50 percent, and the part of the powder ore can be used for producing the yellow phosphorus after being prepared into pellets. In the prior art, a ground phosphate rock pellet preparation system sequentially comprises a grinding unit, a pellet making drying and cooling unit, a reduction reaction unit, a slag cooling unit and a separation and purification unit according to the flow direction of materials, and material conveying is realized between the adjacent units through an adhesive tape machine respectively. The preparation system has the advantages of low utilization rate of the ground phosphate rock and production efficiency in the using processLow pelletizing rate, high production cost. Therefore, it is objectively needed to develop a processing system for low-grade powdered rock phosphate pellets with reasonable structural design, high production efficiency, high productivity, and stable and reliable pellet quality.
Disclosure of Invention
In order to solve the problems in the background art, the invention aims to provide a processing system for low-grade powdered rock phosphate pellets, which has the advantages of reasonable structural design, high production efficiency, high productivity and stable and reliable pellet quality.
The invention relates to a processing system of low-grade phosphate rock powder pellets, which comprises a material preparation unit, a material mixing unit, a pellet pressing unit, a drying and cooling unit and a dust removal unit,
the material preparation unit comprises at least 3 powder storage tanks and binder storage tanks, the powder storage tanks are arranged side by side, the top of each powder storage tank is provided with a feed inlet, the bottom of each powder storage tank is provided with a discharge pipe, a starting gate valve and a star-shaped feeder are arranged on the discharge pipe along the material flow direction, a screen is arranged inside each powder storage tank, the wall of the powder storage tank on the upper side of the screen is provided with a coarse material outlet, a coarse material conveyor is arranged below the coarse material outlet, the bottom of the discharge pipe is provided with a screw feeder, a first rubber belt conveyor is arranged below the screw feeder, the number of the binder storage tanks is 2, the discharge outlets of the 2 binder storage tanks are all connected with a binder conveying pipe, a first conveying pump is arranged on the binder conveying pipe, and the outlets of the binder conveying pipes are connected;
the mixing unit comprises a first mixer and a second mixer, a feed inlet of the first mixer is positioned below a discharge end of the first belt conveyor, a first communicating pipe is arranged between the feed inlet of the first mixer and a discharge outlet of the high-level storage tank, a metering pump is mounted on the first communicating pipe, the discharge outlet of the first mixer is connected with a feed inlet of the second mixer, a second belt conveyor is arranged below the discharge outlet of the second mixer, and a suspension type permanent magnet iron remover is arranged above the second belt conveyor;
the ball pressing unit comprises at least 2 buffer tanks arranged side by side, a second communication pipe is arranged between every two adjacent buffer tanks, a second conveying pump is arranged on the second communication pipe, a feed inlet of one of the buffer tanks is positioned below the discharge end of the second rubber belt conveyor, a disc feeder is arranged below the discharge port of each buffer tank, a weighing belt scale is arranged below the disc feeder, a ball pressing machine is arranged below the discharge port of the weighing belt scale, a third rubber belt conveyor is arranged below the discharge port of the ball pressing machine, a pellet strength detector is arranged below the discharge end of the third rubber belt conveyor, the lower part of an unqualified material outlet of the pellet strength detector is connected with the feed inlet of the ball pressing machine through a lifting machine, a first vibration screening machine is arranged below a qualified material outlet of the pellet strength detector, a first storage tank is arranged below an unqualified material outlet of the first vibration screening machine, a fourth rubber belt conveyor is arranged below a qualified material outlet of the first vibrating screening machine;
the drying and cooling unit comprises a tower dryer and a second vibrating screening machine, a feed inlet of the tower dryer is positioned below a discharge end of a fourth rubber belt conveyor, a fifth rubber belt conveyor is arranged below a discharge port of the tower dryer, a feed inlet of the second vibrating screening machine is positioned below a discharge end of the fifth rubber belt conveyor, a second storage tank is arranged below an unqualified material outlet of the second vibrating screening machine, a cooling machine is arranged below a qualified material outlet of the second vibrating screening machine, and a finished product warehouse is arranged below a discharge port of the cooling machine;
the dust removal unit is 3 groups, arranges respectively in the position of unit of prepareeing material unit, pressure ball unit and stoving cooling unit.
Further, the stoving cooling unit still includes the pelletizing pre-heater, and the pelletizing pre-heater sets up between first vibration screening machine and tower drying-machine, and the pelletizing pre-heater is including preheating the box and running through the first mesh belt conveyor who preheats the box setting, and the feed end of first mesh belt conveyor is located the below of first vibration screening machine certified material export, the discharge end of first mesh belt conveyor is located the top of fourth rubber belt conveyor feed end, and the bottom of preheating the box is provided with a plurality of flue gas imports, and the top of preheating the box is provided with a plurality of hydrofuge mouths, is provided with the discharge flue on the exhaust chamber of tower drying-machine, is provided with many flue gas branch pipes with the flue gas import intercommunication on the discharge flue, installs the admission valve on the flue gas branch pipe, has tail gas treater through the pipe connection on the hydrofuge.
Further, a pellet distributing machine is arranged between the discharge end of the fourth belt conveyor and the feed inlet of the tower type dryer.
Further, the cooler includes the cooling box and runs through the second mesh belt conveyor that the cooling box set up, and the feed end of second mesh belt conveyor is located the below of second vibration screening machine certified material export, and the discharge end of second mesh belt conveyor is located the feed inlet top in finished product storehouse, and the top in the cooling box is provided with a plurality of cooling blower and a plurality of air conditioning import, and the top of cooling box is provided with a plurality of gas vents, and the gas vent also links to each other with the tail gas treater through the pipeline.
Further, every group dust removal unit includes the dust cage, the dust exhaust pipe, gravity dust remover and sack cleaner, the dust cage setting of the unit of prepareeing material is in the feed inlet department of powder storage tank, the dust cage setting of pressure ball unit is in the feed inlet department of first vibration screening machine, the dust cage setting of stoving cooling unit is in the feed inlet department of tower dryer and the feed inlet department of second vibration screening machine, the gas outlet of dust cage links to each other with the air inlet of dust exhaust pipe, the gas outlet of dust exhaust pipe links to each other with the air inlet of gravity dust remover, the gas outlet of gravity dust remover links to each other with the air inlet of sack cleaner, the gas outlet of sack cleaner is provided with the draught fan, the dust outlet of gravity dust remover and sack cleaner all is connected with first scraper conveyor, the discharge gate of first scraper conveyor links to each other with the feed inlet of first blendor.
Furthermore, the discharge ports of the first storage tank and the second storage tank are connected with a second scraper conveyor, and the discharge port of the second scraper conveyor is connected with the feed inlet of the first mixer.
Further, the first mixer and the second mixer are double-shaft mixers.
Furthermore, material guide plates are obliquely arranged below the discharge ends of the first rubber belt conveyor, the second rubber belt conveyor, the third rubber belt conveyor, the fourth rubber belt conveyor and the fifth rubber belt conveyor.
The invention has the following advantages: firstly, after purchased phosphate rock powder raw materials enter a factory, the purchased phosphate rock powder raw materials enter a powder storage tank according to component content, and after screening by a screen, powder and ore powder raw materials with unqualified particle sizes can be screened out to obtain phosphate rock powder particles with qualified and uniform particle sizes, so that the specific surface area of the phosphate rock powder is favorably improved, meanwhile, two adhesive storage tanks are arranged for realizing the configuration of the adhesive, and the arranged high-level storage tank is used for caching the adhesive to ensure continuous and smooth production of a downstream process; secondly, the mixing device adopts a structure of two-stage mixer arrangement, and the ground phosphate rock raw material and the adhesive are mixed twice in the first mixer and the second mixer, so that a better mixing and stirring effect is achieved; thirdly, the mixture obtained by stirring and mixing enters each buffer tank, and then enters a ball press to be pressed into pellets after being subjected to quantitative feeding of a disc feeder and a weighing belt scale, the formed pellets enter a pellet strength detector to be subjected to strength detection, the pellets with unqualified strength are removed, the pelletizing rate of the pellets after subsequent drying is improved, the pellets with the strength meeting the requirement enter a first vibrating screening machine again to be screened, the pellets which do not meet the diameter requirement are screened out, the pellets with the diameter meeting the requirement are obtained, the yield of the pellets in a subsequent drying device is improved, and a plurality of ball presses simultaneously perform ball production work, so that the yield of the whole device is improved; fourthly, the pellets are sent into a tower type dryer for drying, the contact area between hot air and the pellets in the tower type dryer is large, the contact temperature is uniform, the drying efficiency is high, the drying speed is high, the dried pellets can be further screened out after being screened by a second vibrating screen classifier, and the dried pellets which are high in strength and meet the requirements are obtained; fifthly, the corresponding dust removal unit is arranged on the processing unit capable of generating dust, so that the dust emission can be avoided, and the clean production of the whole production system can be ensured. In conclusion, the system has the advantages of reasonable structural design, high production efficiency, high capacity, stable and reliable pellet quality and high ground phosphate rock utilization rate, can generate good economic benefit and is easy to popularize and use.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1-powder storage tank, 101-charging opening, 102-discharging pipe, 103-starting gate valve, 104-star feeder, 105-screen, 106-coarse material outlet, 107-coarse material conveyor, 108-screw feeder, 2-adhesive storage tank, 201-adhesive conveying pipe, 202 first conveying pump, 203-high storage tank, 204-first communicating pipe, 205-metering pump, 3-first adhesive tape conveyor, 4-first mixer, 5-second mixer, 6-second adhesive tape conveyor, 7-suspended permanent magnet iron remover, 8-buffer tank, 801-second communicating pipe, 802-second conveying pump, 9-disc feeder, 10-weighing belt scale, 11-ball press, 12-third adhesive tape conveyor, 13-a first vibrating screen classifier, 14-a first storage tank, 15-a pellet strength detector, 16-a fourth belt conveyor, 17-a tower dryer, 18-a second vibrating screen classifier, 19-a fifth belt conveyor, 20-a second storage tank, 21-a cooler, 22-a finished product warehouse, 23-a pellet preheater, 24-a pellet distributor, 25-a smoke exhaust pipe, 26-a tail gas processor, 27-a dust collection cover, 28-a dust exhaust pipe, 29-a gravity dust collector, 30-a bag dust collector, 31-a first scraper conveyor and 32-a guide plate.
Detailed Description
The invention is further illustrated by the following description of embodiments and the accompanying drawings, without in any way limiting the invention, and any alterations or substitutions made on the basis of the teachings of the invention shall fall within the scope of protection of the invention.
As shown in figure 1, the processing system of the low-grade phosphate rock pellet is characterized by comprising a material preparation unit, a material mixing unit, a pellet pressing unit, a drying and cooling unit and a dust removal unit, wherein the material preparation unit is used for preparing a phosphate rock raw material and a bonding agent, the material mixing unit is used for stirring and mixing the phosphate rock raw material and the bonding agent, the pellet pressing unit is used for pressing a mixture of the phosphate rock raw material and the bonding agent into pellets, the drying and cooling unit is used for drying and sintering the pellets by utilizing a heat source to prepare dry pellets, and the dust removal unit is used for collecting and purifying dust generated in the working process of the material preparation unit, the material mixing unit, the pellet pressing unit and the drying and cooling unit, so that the clean production of the whole production system is ensured.
The material preparation unit comprises a powder storage tank 1 and a binder storage tank 2, wherein the powder storage tank 1 is used for storing ground phosphate rock raw materials, at least 3 powder storage tanks 1 are arranged side by side, a feed inlet 101 is arranged at the top of each powder storage tank 1, a discharge pipe 102 is arranged at the bottom of each powder storage tank 1, a starting gate valve 103 and a star-shaped discharger 104 are arranged on the discharge pipe 102 along the material flow direction, a pneumatic gate valve 103 and the star-shaped discharger 104 are used for discharging the ground phosphate rock raw materials in the powder storage tanks 1, a screen 105 is arranged inside each powder storage tank 1, the screen 105 is used for screening ground phosphate rock, a coarse material outlet 106 is arranged on the wall of the powder storage tank 1 above the screen 105, a coarse material conveyor 107 is arranged below the coarse material outlet 106, a spiral feeder 108 is arranged at the bottom of the discharge pipe 102, and the spiral feeder 108 is the prior art and is used for realizing the quantitative feeding of the ground phosphate, first rubber belt conveyor 3 is installed to screw feeder 108's below, and first rubber belt conveyor 3 is prior art, binder storage tank 2 is 2, and binder storage tank 2 is used for the preparation of binder, and 2 binder storage tank 2's discharge gate all is connected with a binder conveyer pipe 201, install first conveying pump 202 on the binder conveyer pipe 201, the exit linkage of binder conveyer pipe 201 has high-order storage tank 203, and high-order storage tank 203 is used for caching the binder of preparation to guarantee the continuous, smooth production of low reaches process.
The mixing unit comprises a first mixer 4 and a second mixer 5, preferably, the first mixer 4 and the second mixer 5 are double-shaft mixers, the feed inlet of the first mixer 4 is positioned below the discharge end of the first belt conveyor 3, a first communicating pipe 204 is arranged between the feed inlet of the first mixer 4 and the discharge outlet of the high-level storage tank 203, a metering pump 205 is arranged on the first communicating pipe 204, the discharge outlet of the first mixer 4 is connected with the feed inlet of the second mixer 5, a second belt conveyor 6 is arranged below the discharge outlet of the second mixer 5, the second belt conveyor 6 is in the prior art, a suspension type permanent magnet iron remover 7 is arranged above the second belt conveyor 6, the suspension type permanent magnet iron remover 7 is used for removing ferromagnetic materials in the mixed materials, and a two-stage mixer arrangement structure is adopted, the ground phosphate rock raw material and the adhesive are mixed twice in the first mixer 4 and the second mixer 5, which has better mixing and stirring effect,
the ball pressing unit comprises at least 2 buffer tanks 8 arranged side by side, the buffer tanks 8 are arranged for storing a mixture of ground phosphate rock and a bonding agent, the continuous production of the system is ensured, a second communication pipe 801 is arranged between every two adjacent buffer tanks 8, a second material conveying pump 802 is installed on the second communication pipe 801, a feed inlet of one buffer tank 8 is positioned below a discharge end of the second rubber belt conveyor 6, a disc feeder 9 is arranged below a discharge outlet of each buffer tank 8, a weighing belt scale 10 is arranged below the disc feeder 9, the disc feeder 9 and the weighing belt scale 10 are matched for use, so that the quantitative feeding of the mixture can be realized, the uniform and stable feeding amount of the mixture entering the ball pressing machine 11 is ensured, the disc feeder 9 and the weighing belt scale 10 are the prior art, the ball pressing machine 11 is arranged below the discharge outlet of the weighing belt scale 10, the ball press 11 is a double-roller ball press used in the prior art, a third rubber belt conveyor 12 is arranged below a discharge port of the ball press 11, a pellet strength detector 15 is arranged below a discharge end of the third rubber belt conveyor 12, the pellet strength detector 15 is used for detecting the strength of pellets, an unqualified material outlet of the pellet strength detector 15 is connected with a feed port of the ball press 11 through a hoister, a first vibrating screen machine 13 is arranged below a qualified material outlet of the pellet strength detector 15, a first storage tank 14 is arranged below an unqualified material outlet of the first vibrating screen machine 13, a fourth rubber belt conveyor 16 is arranged below a qualified material outlet of the first vibrating screen machine 13, the fourth rubber belt conveyor 16 is used in the prior art, and a mixture obtained by stirring and mixing firstly enters each buffer tank 8 and then is quantitatively fed through a disc feeder 9 and a weighing belt scale 10, the pellets are pressed into pellets in the ball press 11, the formed pellets enter the pellet strength detector 15 for strength detection, the pellets with unqualified strength are removed, the pelletizing rate of the pellets after subsequent drying is improved, the pellets with qualified strength enter the first vibrating screen 13 for screening again, the pellets which do not meet the diameter requirement are screened out, the pellets with qualified diameter are obtained, the yield of the pellets in the subsequent drying device is improved, and the plurality of ball press 11 simultaneously perform ball production, so that the capacity of the whole device is improved.
The drying and cooling unit comprises a tower dryer 17 and a second vibrating screen 18, a feed inlet of the tower dryer 17 is positioned below a discharge end of a fourth rubber belt conveyor 16, a fifth rubber belt conveyor 19 is arranged below a discharge port of the tower dryer 17, the fifth rubber belt conveyor 19 is the prior art, a feed inlet of the second vibrating screen 18 is positioned below a discharge end of the fifth rubber belt conveyor 19, a second storage tank 20 is arranged below an unqualified material outlet of the second vibrating screen 18, a cooler 21 is arranged below a qualified material outlet of the second vibrating screen 18, a finished product warehouse 22 is arranged below a discharge port of the cooler 21, the pellets are sent into the tower dryer 17 for drying, the contact area between hot air and the pellets in the tower dryer 17 is large, the contact temperature is uniform, the drying efficiency is high, the drying speed is high, the dried pellets are screened by the second vibrating screen 18, the dried pellets which do not meet the requirements can be further screened out, and the dry pellets which have high strength and meet the requirements are obtained.
The dust removal unit is 3 groups, arranges respectively in the position department of unit of prepareeing material, pressure ball unit and stoving cooling unit, sets up corresponding dust removal unit at the processing unit that can produce the dust, can avoid the emission of dust, is favorable to guaranteeing whole production system's clean production.
The working process of the system is as follows: after the purchased ground phosphate rock raw materials enter a factory, the purchased ground phosphate rock raw materials sequentially enter each powder storage tank 1 through a charging port 101 according to the component content, after the ground phosphate rock enters the powder storage tank 1, after being screened by a screen 105, the ground phosphate rock which does not meet the requirement of the particle size is discharged through a coarse material outlet 106, after being output by a coarse material conveyor 107, the ground phosphate rock is reused, while the ground phosphate rock which meets the requirement of the particle size falls into the bottom of the powder storage tank 1 below the screen 105, when the ingredients are required to be prepared, the pneumatic gate valve 103 and the star-shaped feeder 104 are opened, the ground phosphate rock at the bottom of the powder storage tank 1 can be discharged from the feeding pipe 102, is quantitatively conveyed to the first rubber belt conveyor 3 through the screw feeder 108, and then conveyed into the first mixer 4 through the first rubber belt conveyor 3, while the ground phosphate rock raw materials are conveyed to the first mixer 4, the metering pump 205 is also opened at the same time, the adhesive stored in the high-level storage tank 203 is conveyed to the first mixer 4 through the first, the adhesive and the phosphate rock powder are stirred and mixed in the first mixer 4 and then enter the second mixer 5 for second stirring and mixing, the mixture after the second stirring and mixing is sent into the buffer tanks 8 through the second rubber belt conveyor 6, the suspension type permanent magnet iron remover 7 can remove ferromagnetic materials in the mixture in the process of conveying the mixture by the second rubber belt conveyor 6, the buffer tanks 8 are communicated through the second communicating pipe 801, when in use, the quantity of the buffer tanks 8 can be reasonably selected according to the use requirement and the production capacity, after the mixture enters the buffer tanks 8, the mixture firstly enters the disc feeder 9 and then is uniformly fed by the disc feeder 9, then the weighing belt scale 10 conveys the mixture into the ball press 11, and after the mixture is extruded by the ball press 11, the mixture can be made into pellets with certain strength, the pellets produced by the ball press 11 enter the pellet strength detector 15, after the detection of the pellet strength detector 15, the pellets which do not meet the strength are crushed and then enter the ball press 11 again for pelletizing, the pellets which meet the strength requirement enter the first vibrating screen 13, after the screening of the first vibrating screen 13, the pellets which do not meet the requirement enter the first storage tank 14, the pellets which meet the requirement are conveyed to the tower type dryer 17 by the fourth rubber belt conveyor 16, after the drying and sintering by hot air, the dry pellets are obtained, after the dry pellets are discharged from the bottom of the tower type dryer 7, the dry pellets are conveyed to the second vibrating screen 18 by the fifth rubber belt conveyor 19, after the screening of the second vibrating screen 18, the unqualified dry pellets enter the second storage tank 20, and the qualified dry pellets enter the finished product warehouse 22 after the cooling of the cooler 21, if necessary, a dry pellet strength detector may be disposed between the fifth tape screening machine 19 and the first vibratory screening machine 18 to further improve the quality of the dry pellets. In conclusion, the system has the advantages of reasonable structural design, high production efficiency, high productivity, stable and reliable pellet quality and high ground phosphate rock utilization rate.
Further, in order to improve the drying efficiency of the tower dryer 17, the drying and cooling unit further comprises a pellet preheater 23, the pellet preheater 23 is arranged between the first vibrating screen 13 and the tower dryer 17, the pellet preheater 23 comprises a preheating box body and a first mesh belt conveyor penetrating through the preheating box body, the feed end of the first mesh belt conveyor is positioned below the qualified material outlet of the first vibrating screen 13, the discharge end of the first mesh belt conveyor is positioned above the feed end of the fourth rubber belt conveyor 16, the bottom of the preheating box body is provided with a plurality of flue gas inlets, the top of the preheating box is provided with a plurality of moisture discharge ports, a smoke discharge chamber of the tower dryer 17 is provided with a smoke discharge pipe 25, the smoke discharge pipe 25 is provided with a plurality of flue gas branch pipes communicated with the flue gas inlets, the flue gas branch pipes are provided with air inlet valves, and the moisture discharge ports are connected with a tail gas processor 26 through pipelines, utilize pellet pre-heater 23 to preheat the pelletizing that enters into in tower drying-machine 17, in order to improve the temperature that the pelletizing enters into in tower drying-machine 17, in addition, tower drying-machine 17 is heating the in-process of drying to the pelletizing, exhaust flue gas temperature from the smoke exhaust chamber is high, the heat content is very big, direct emission can cause the waste of heat energy, send into the flue gas of exhaust pipe 25 exhaust and preheat the pelletizing in pellet pre-heater 23, can realize the maximize of heat utilization, after the heat absorption of pelletizing in pellet pre-heater 23, flue gas temperature reduces, follow discharge port discharge back reentrant tail gas treater 26 in and carry out subsequent purification treatment. In order to ensure uniform distribution of the pellets entering the tower dryer 17, a pellet distributor 24 is preferably arranged between the discharge end of the fourth belt conveyor 16 and the feed inlet of the tower dryer 17.
Further, cooler 21 includes the cooling box and runs through the second mesh belt conveyor that the cooling box set up, the feed end of second mesh belt conveyor is located the below of the export of the 18 certified products of second vibration screening machine, the discharge end of second mesh belt conveyor is located finished product storehouse 22's feed inlet top, top in the cooling box is provided with a plurality of cooling blower and a plurality of air conditioning import, the top of cooling box is provided with a plurality of gas vents, and the gas vent also links to each other with tail gas treater 26 through the pipeline, utilizes air cooling's mode to cool off the pelletizing, and the cooling effect is better, and hot gas after the cooling enters into tail gas treater 26 after the gas vent discharges in, can avoid air pollution.
Further, each group of dust removing units comprises a dust collecting cover 27, a dust exhaust pipe 28, a gravity dust collector 29 and a bag-type dust collector 30, the gravity dust collector 29 and the bag-type dust collector 30 adopt structures in the prior art, the dust collecting cover 27 of the material preparing unit is arranged at the feed port 101 of the powder storage tank 1, the dust collecting cover 27 of the ball pressing unit is arranged at the feed port of the first vibrating screen machine 13, the dust collecting cover 27 of the drying and cooling unit is arranged at the feed port of the tower-type drying machine 17 and the feed port of the second vibrating screen machine 18, the gas outlet of the dust collecting cover 27 is connected with the gas inlet of the dust exhaust pipe 28, the gas outlet of the dust exhaust pipe 28 is connected with the gas inlet of the gravity dust collector 29, the gas outlet of the gravity dust collector 29 is connected with the gas inlet of the bag-type dust collector 30, the gas outlet of the bag-type dust collector 30 is provided with a draught fan, and the, can ensure the clean production of whole production system, simultaneously the dust export of gravity dust collector 29 and sack cleaner 30 all is connected with first scraper conveyor 31, the discharge gate of first scraper conveyor 31 links to each other with the feed inlet of first blendor 4, utilizes first scraper conveyor 31 can also retrieve the dust of collecting and recycle.
Further, the discharge ports of the first storage tank 14 and the second storage tank 20 are connected with a second scraper conveyor, the discharge port of the second scraper conveyor is connected with the feed port of the first mixer 4, and the unqualified pellets in the first storage tank 14 and the second storage tank 20 can be recycled after being crushed by the second scraper conveyor.
Further, material guide plates 32 are obliquely arranged below the discharge ends of the first rubber belt conveyor 3, the second rubber belt conveyor 6, the third rubber belt conveyor 12, the fourth rubber belt conveyor 16 and the fifth rubber belt conveyor 19, and the arranged material guide plates 32 can guide the materials at the discharge ends of the rubber belt conveyors into corresponding equipment, so that the possibility of material leakage is avoided.
Claims (8)
1. The processing system of the low-grade powdered rock phosphate pellets is characterized by comprising a material preparation unit, a material mixing unit, a pellet pressing unit, a drying and cooling unit and a dust removal unit, and is characterized in that:
the material preparation unit comprises powder storage tanks (1) and binder storage tanks (2), the number of the powder storage tanks (1) is at least 3, the powder storage tanks (1) are arranged side by side, a feeding port (101) is arranged at the top of each powder storage tank (1), a discharging pipe (102) is arranged at the bottom of each powder storage tank, a starting gate valve (103) and a star-shaped discharging device (104) are arranged on the discharging pipe (102) along the flowing direction of materials, a screen (105) is arranged inside each powder storage tank (1), a coarse material outlet (106) is arranged on the wall of each powder storage tank (1) on the upper side of the screen (105), a coarse material conveyor (107) is arranged below the coarse material outlet (106), a screw feeder (108) is arranged at the bottom of the discharging pipe (102), a first adhesive tape conveyor (3) is arranged below the screw feeder (108), and the number of the binder storage tanks (2) is 2, the discharge ports of the 2 binder storage tanks (2) are connected with a binder conveying pipe (201), a first material conveying pump (202) is installed on the binder conveying pipe (201), and the outlet of the binder conveying pipe (201) is connected with a high-level storage tank (203);
the mixing unit comprises a first mixer (4) and a second mixer (5), a feed inlet of the first mixer (4) is positioned below a discharge end of a first rubber belt conveyor (3), a first communication pipe (204) is arranged between the feed inlet of the first mixer (4) and a discharge outlet of a high-level storage tank (203), a metering pump (205) is installed on the first communication pipe (204), the discharge outlet of the first mixer (4) is connected with the feed inlet of the second mixer (5), a second rubber belt conveyor (6) is arranged below the discharge outlet of the second mixer (5), and a permanent magnet suspension type iron remover (7) is arranged above the second rubber belt conveyor (6);
the ball pressing unit comprises at least 2 buffer tanks (8) arranged side by side, a second communication pipe (801) is arranged between every two adjacent buffer tanks (8), a second material conveying pump (802) is installed on the second communication pipe (801), the feed inlet of one buffer tank (8) is positioned below the discharge end of a second rubber belt conveyor (6), a disc feeder (9) is arranged below the discharge outlet of each buffer tank (8), a weighing belt scale (10) is arranged below the disc feeder (9), a ball pressing machine (11) is arranged below the discharge outlet of the weighing belt scale (10), a third rubber belt conveyor (12) is arranged below the discharge outlet of the ball pressing machine (11), a pellet strength detector (15) is arranged below the discharge end of the third rubber belt conveyor (12), and the lower part of the unqualified material outlet of the pellet strength detector (15) is connected with the feed inlet of the ball pressing machine (11) through a hoisting machine, a first vibrating screening machine (13) is arranged below a qualified material outlet of the pellet strength detector (15), a first storage tank (14) is arranged below an unqualified material outlet of the first vibrating screening machine (13), and a fourth rubber belt conveyor (16) is arranged below a qualified material outlet of the first vibrating screening machine (13);
the drying and cooling unit comprises a tower dryer (17) and a second vibrating screening machine (18), a feed inlet of the tower dryer (17) is positioned below a discharge end of a fourth rubber belt conveyor (16), a fifth rubber belt conveyor (19) is arranged below a discharge outlet of the tower dryer (17), a feed inlet of the second vibrating screening machine (18) is positioned below a discharge end of the fifth rubber belt conveyor (19), a second storage tank (20) is arranged below an unqualified material outlet of the second vibrating screening machine (18), a cooler (21) is arranged below a qualified material outlet of the second vibrating screening machine (18), and a finished product warehouse (22) is arranged below a discharge outlet of the cooler (21);
the dust removal unit is 3 groups, and is respectively arranged at the positions of the material preparation unit, the ball pressing unit and the drying and cooling unit.
2. The system of claim 1, wherein the system comprises: the drying and cooling unit also comprises a pellet preheater (23), the pellet preheater (23) is arranged between the first vibrating screening machine (13) and the tower type dryer (17), the pellet preheater (23) comprises a preheating box body and a first mesh belt conveyor which penetrates through the preheating box body, the feeding end of the first mesh belt conveyor is positioned below a qualified material outlet of the first vibrating screening machine (13), the discharge end of the first mesh belt conveyor is positioned above the feed end of the fourth rubber belt conveyor (16), the bottom of the preheating box body is provided with a plurality of flue gas inlets, the top of the preheating box body is provided with a plurality of moisture discharging ports, a smoke exhaust pipe (25) is arranged on a smoke exhaust chamber of the tower body dryer (17), a plurality of smoke branch pipes communicated with a smoke inlet are arranged on the smoke exhaust pipe (25), an air inlet valve is installed on the flue gas branch pipe, and a tail gas processor (26) is connected to the moisture exhaust port through a pipeline.
3. The system of claim 1, wherein the system comprises: a pellet distributing machine (24) is arranged between the discharge end of the fourth rubber belt conveyor (16) and the feed inlet of the tower type dryer (17).
4. The system of claim 1, wherein the system comprises: cooler (21) are including the cooling box and run through the second guipure conveyer that the cooling box set up, the feed end of second guipure conveyer is located the below of second vibration screening machine (18) certified material export, the discharge end of second guipure conveyer is located the feed inlet top of finished product storehouse (22), top in the cooling box is provided with a plurality of cooling blower and a plurality of air conditioning import, the top of cooling box is provided with a plurality of gas vents, and the gas vent also links to each other with tail gas treater (26) through the pipeline.
5. The system of claim 1, wherein the system comprises: every group dust removal unit includes dust cage (27), dust exhaust pipe (28), gravity dust remover (29) and sack cleaner (30), and dust cage (27) of the unit of prepareeing material set up charge door (101) department in powder storage tank (1), dust cage (27) of pressure ball unit set up the feed inlet department at first vibration screening machine (13), dust cage (27) of stoving cooling unit set up the feed inlet department at tower dryer (17) and the feed inlet department of second vibration screening machine (18), the gas outlet of dust cage (27) links to each other with the air inlet of dust exhaust pipe (28), the gas outlet of dust exhaust pipe (28) links to each other with the air inlet of gravity dust remover (29), the gas outlet of gravity dust remover (29) links to each other with the air inlet of sack cleaner (30), the gas outlet of sack cleaner (30) is provided with the draught fan, the dust export of gravity dust remover (29) and sack cleaner (30) all is connected with first scraper blade and defeated dust And the discharge hole of the first scraper conveyor (31) is connected with the feed hole of the first mixer (4).
6. The system of claim 1, wherein the system comprises: and the discharge holes of the first storage tank (14) and the second storage tank (20) are connected with a second scraper conveyor, and the discharge hole of the second scraper conveyor is connected with the feed inlet of the first mixer (4).
7. The system of claim 1, wherein the system comprises: and the first mixer (4) and the second mixer (5) are double-shaft mixers.
8. The system of claim 1, wherein the system comprises: and material guide plates (32) are obliquely arranged below the discharge ends of the first rubber belt conveyor (3), the second rubber belt conveyor (6), the third rubber belt conveyor (12), the fourth rubber belt conveyor (16) and the fifth rubber belt conveyor (19).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113004102A (en) * | 2021-03-08 | 2021-06-22 | 广州市土根旺生物科技有限公司 | Full water-soluble agate type granular bacterial manure production equipment |
| CN116002638A (en) * | 2023-02-08 | 2023-04-25 | 会东金川磷化工有限责任公司 | Precise batching equipment for yellow phosphorus production system and control method |
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| CN103964404A (en) * | 2014-04-24 | 2014-08-06 | 贵州省惠水川东化工有限公司 | Method for producing powdered rock phosphate balls by using powdered rock phosphate |
| US20160152472A1 (en) * | 2013-06-04 | 2016-06-02 | Sichuan Ko Chang Technology Co., Ltd | Method for mass production of phosphoric acid with rotary kiln |
| CN214299291U (en) * | 2021-01-07 | 2021-09-28 | 云南省宣威东升化工有限公司 | Processing system of low-grade ground phosphate rock pelletizing |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160152472A1 (en) * | 2013-06-04 | 2016-06-02 | Sichuan Ko Chang Technology Co., Ltd | Method for mass production of phosphoric acid with rotary kiln |
| CN103964404A (en) * | 2014-04-24 | 2014-08-06 | 贵州省惠水川东化工有限公司 | Method for producing powdered rock phosphate balls by using powdered rock phosphate |
| CN214299291U (en) * | 2021-01-07 | 2021-09-28 | 云南省宣威东升化工有限公司 | Processing system of low-grade ground phosphate rock pelletizing |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113004102A (en) * | 2021-03-08 | 2021-06-22 | 广州市土根旺生物科技有限公司 | Full water-soluble agate type granular bacterial manure production equipment |
| CN113004102B (en) * | 2021-03-08 | 2022-07-29 | 广州天适立农生态农业发展有限公司 | Full water-soluble agate type granular bacterial manure production equipment |
| CN116002638A (en) * | 2023-02-08 | 2023-04-25 | 会东金川磷化工有限责任公司 | Precise batching equipment for yellow phosphorus production system and control method |
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| CN112408343B (en) | 2024-04-19 |
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