CN205133692U - A fluidized bed furnace device for oxidizing roasting draws rhenium - Google Patents
A fluidized bed furnace device for oxidizing roasting draws rhenium Download PDFInfo
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- CN205133692U CN205133692U CN201520851693.5U CN201520851693U CN205133692U CN 205133692 U CN205133692 U CN 205133692U CN 201520851693 U CN201520851693 U CN 201520851693U CN 205133692 U CN205133692 U CN 205133692U
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Abstract
The utility model relates to a rhenium recycle equipment technical field, concretely relates to a fluidized bed furnace device for oxidizing roasting draws rhenium. This fluidized bed furnace device is equipped with fluidized bed furnace, air distributing system (11) and dust pelletizing system, and fluidized bed furnace furnace body (1) is equipped with mixed reaction zone (2) and second reaction zone, and the second reaction zone is higher than discharge gate (3) and upwards is equipped with hole enlargement section (4) and reducing section (5) in proper order along furnace body (1), in plenum (7) below mixed reaction zone (2) are located in air distributing system (11), and is equipped with gas distribution baffle (9) of taking the hood between the mixture reaction zone (2), the dust pelletizing system is equipped with 1~2 grade cyclone (18) and ceramic filter core dust collector (19). The utility model discloses a to the improvement of fluidized bed furnace furnace body, dust pelletizing system, improved the oxidizing roasting efficiency and the rhenium volatility in rhenium -containing ore deposit, reduced calcination dust volume, improved production efficiency, improve the dust removal mode, reduced the loss of rhenium -containing flue gas at the dust removal in -process.
Description
Technical field
The utility model relates to Rhenium recovery and utilizes equipment technical field, is specifically related to a kind of boiling furnace device extracting rhenium for oxidizing roasting.
Background technology
Noble metal rhenium and compound thereof; owing to having special physics, chemical property; as electroconductibility, catalytic activity etc., be widely used in the development of petrochemical complex platinum-rhenium reforming catalyst, military project material, high-temperature material and novel environment friendly compound etc. are numerous.
Because nature itself is without independently rhenium mineral deposit, the main and molybdenum ore of rhenium or copper mine association coexist, and the rhenium source of supply of existing market is all process the byproduct obtained in molybdenum ore or copper mine.According to domestic and international disclosed technology, the recovery of rhenium product and the first step of production are first decomposed rhenium to transfer in rhenium-containing extracting solution from rhenium-containing ore deposit.
From the technology extracting rhenium both at home and abroad, although wet oxidation and pyrogenic process oxidation (i.e. oxidizing roasting) method all can extract rhenium from rhenium-containing ore deposit, but wet oxidation aftertreatment trouble and molybdenum rhenium are separated difficult, because rhenium is that association is in molybdenum ore or copper mine, and molybdenum ore and copper mine mainly adopt pyrogenic process method for oxidation to smelt, therefore pyrogenic process oxidation remains the means of the most traditional and topmost extraction rhenium.The principle that rhenium is extracted in oxidizing roasting is as follows: when roasting is carried out in rhenium-containing ore deposit under aerobic conditions, sulfuration rhenium (comprises Re
2s
7and ReS
2) be oxidized to high price rhenium oxide Re
2o
7.Re
2o
7boiling point be 361 DEG C, boiling point is low, high volatility, and under the maturing temperature of concentrated molybdenum ore, volatilization enters in flue gas, and abstraction reaction be (Zhang Qixiu, Zhao Qinsheng edit, " tungsten metallurgy ", in September, 2005, the 212nd page): 2Re
2s
7+ 21O
2=2Re
2o
7+ 14SO
2, 4ReS
2+ 15O
2=2Re
2o
7+ 8SO
2; Flue gas after dedusting, gaseous state rhenium oxide Re
2o
7enter washing smoke, Re
2o
7water-soluble generation perrhenic acid, Re
2o
7+ H
2o=2HReO
4, obtain rhenium-containing extracting solution, then carry out Rhenium recovery further.
In the disclosed technology of WRC world resource company limited (WorldResourcesCompany, US20130078166), be namely obtain on the basis of rhenium disulfide at wet underwater welding, adopt oxidizing roasting method sulfuration rhenium to be oxidized to rhenium oxide, 2Re
2s
7+ 21O
2+ heat=2Re
2o
7(distillation)+14SO
2, make rhenium oxide enter flue gas, reprocessing flue gas obtains ammonium perrhenate, Jilin Iron Alloy Plant (application of rhenium, extraction and market analysis, analogy celebrating China, mineral products fully utilize, phase nineteen ninety-five the 3rd) be the manufacturer that China reclaims rhenium the earliest, adopt multiple hearth furnace roasting, flue gas is gathered dust by dry type electricity, wet type electricity gathers dust, finally absorb with water, through extraction, after change into ion-exchange produce ammonium perrhenate, the total recovery of rhenium only has 50%, Yanggu Xiangguang Copper Co., Ltd. (CN201210099836.2) proposes a kind of method extracting rhenium in rich rhenium concentrate, comprise the following steps: rich rhenium concentrate and unslaked lime are mixed and finely ground, compound passes into oxygen-rich air and carry out roasting at 400 DEG C ~ 900 DEG C in electric furnace, material water after roasting to be sized mixing leaching, filter after leaching, liquid after filter is added cleaner removing calcium and micro heavy ion, filter after removal of impurities, after filter after removal of impurities being filtered, liquid anionite-exchange resin carries out ion-exchange, Ammonium rhenate solution is obtained after desorb, reconcentration crystallization obtains ammonium perrhenate.
Such as the concentrated molybdenum ore oxidizing roasting of rhenium-containing ore deposit is being adopted to extract in the technology of rhenium due to existing, early stage simple and easy reverberatory furnace, rotary kiln wide at present, multiple hearth furnace, because ore particle is piled up, passing furnace charge is manually stirred although adopt respectively, mechanical rake stirs flight in passing furnace charge or kiln cylinder and promotes the stirring problem that the mode stirring furnace charge solves roasting process furnace charge, but mineral contact insufficient with oxygen source, all there is oxidation sweetening efficiency low, roasting time is long, the problem that Rhenium recovery rate is low, rough Statistics, in smelting process, because the valency rare elements rhenium that has of association in molybdenum glance is oxidized insufficient and loses with flue gas, Rhenium recovery rate only about 70%, and adopt the fluidization oxidizing roasting method of fluidizing furnace, because mineral fully can contact with oxygen, and can continous way charging discharging, oxidizing roasting efficiency and throughput are all greatly improved, evaporation rate (application of rhenium, extraction and the market analysis up to 85% ~ 97% can be obtained, analogy celebrating China, mineral products fully utilize, phase nineteen ninety-five the 3rd),
The disclosed fluidizing furnace of Sichuan Hua Tong energy and material company limited (CN201220311590.6), comprises air-blast device, opening for feed, smoke outlet, body of heater, thermal insulation layer and discharge port; Described thermal insulation layer is arranged on the outside of body of heater; The intake stack of described air-blast device is arranged on the bottom of body of heater through thermal insulation layer and body of heater; Described discharge port is arranged on the bottom of body of heater, and opening for feed is arranged on the top of body of heater, and smoke outlet is arranged on the top of body of heater; Also comprise screen cloth and some fuel gas inlet, the sidewall of fuel gas inlet is provided with portfire; Filter screen is provided with in described smoke outlet; Described screen cloth is arranged on the middle and lower part of body of heater, and fuel gas inlet is arranged on furnace interior through thermal insulation layer and body of heater; The fuel gas inlet that this fluidizing furnace is arranged in the Different Plane of body of heater, to ensure the thorough roasting of the material of furnace interior, arranges screen cloth to stop that granularity does not reach the material of production requirement in the middle and lower part of body of heater;
The efficient fluidizing furnace of double-jacket that Huangshi Tian Da thermal hardware company limited (CN201420567257.0) proposes, there is body of heater, body of heater internal surface is provided with flame retardant coating, the top of body of heater is provided with smoke outlet, the bottom of body of heater is provided with blast inlet and slag emission mouth, body of heater is provided with fuel-feed pipe, body of heater adopts cylinder-shaped steel structure, body of heater is double-deck, inner barrel and outer cylinder body, inner barrel is arranged in the middle and lower part of outer cylinder body, establishes secondary air-inlet channel between inner barrel and outer cylinder body, secondary air inlet is established in outer cylinder body bottom, and secondary air inlet is connected with secondary air duct; Inside establish spiral flow deflector; The secondary air duct of this fluidizing furnace between inner barrel and outer cylinder body is to cool inner barrel and air distribution temperature adjustment;
The boiling furnace device of the disclosed circulation calcining molybdenum concentrate of Luoyang Luanchuan Molybdenum Industry Group Co., Ltd. (CN201210129459.2), comprises fluidizing furnace, dust collecting system and off-gas recovery and utilizes system; Also comprise to wind system, feeding system and the discharging automated package system of discharge port being connected to fluidizing furnace; Dust collecting system and feeding system are all connected to fluidizing furnace opening for feed; Describedly be connected to fluidizing furnace air compartment to wind system, be made up of roots blower, heating equipment, the equipment that can indicate and control air compartment internal pressure and air influx; This boiling furnace device object makes concentrated molybdenum ore fully contact with enough oxygen, makes calcining molybdenum ore concentrate process not need external heat source heat supply and can the High-efficient Production solvable molybdenum rate high soluble molybdenum oxide that is greater than 98%;
The disclosed fluidizing furnace for heating material is oxidized of Gansu neolite building material limited liability company (CN201420523642.5), comprise body of heater, the top of described body of heater is ebuillition of heated district, the bottom of body of heater is bellows, these bellows and ebuillition of heated district are separated by air distribution plate, and this air distribution plate is laid with air holes; Heat conduction tubulation is provided with in described ebuillition of heated district, one sidewall in this ebuillition of heated district is provided with material inlet, the sidewall that this sidewall is relative is provided with material outlet, ebuillition of heated district between described material inlet and material outlet is vertically provided with dividing plate and is separated out by ebuillition of heated, and the height of this dividing plate is less than the height in described ebuillition of heated district; The bottom of described bellows is connected with blower fan; This fluidizing furnace increases material movement path by arranging dividing plate improves heat utilization rate;
The fluidizing furnace for roasting nickel-molybdenum ore that Guizhou Hua Guimu nickel limited-liability company (CN201320874458.0) proposes, comprises body of heater, grid distributor, water jacket, stove lift angle, smoke outlet and overflow discharge gate, to carry out roasting to nickel-molybdenum ore well;
The disclosed fluidizing furnace of CHINA ENFI ENGINEERING CORPORATION (CN200820080341.4), comprise: body of heater, described body of heater is formed with charging opening, venting port and discharge port, the inner chamber bottom of described body of heater is limited with boiling section, the bottom of the contiguous boiling section of wherein said discharge port, and the height of described body of heater is greater than 7 meters; Blast cap seat, is formed with multiple through hole in the opening that described blast cap seat is arranged on body of heater bottom; Multiple blast cap, described multiple blast cap is arranged in the multiple through holes on blast cap seat respectively; And bellows, described bellows have blast inlet and are arranged on the bottom, bottom of described body of heater, and wherein said blast cap is communicated with inner chamber and the bellows of body of heater; Body of heater and boiling section height increase by this fluidizing furnace, and to make furnace charge long with the residence time in boiling section in stove, roasting is abundant;
The disclosed fluidizing furnace of Hunan numerous mountains mining industry company limited (CN201330122616.7), comprise interconnective fluidized bed and suspended layer, suspended layer is provided with enlargement layer, enlargement layer is connected with fluidized bed, enlargement layer is inverted cone-shaped structure, enlargement layer inwall is provided with the weighting material bed of material, fill material layer thickness increases gradually from enlargement layer top-to-bottom, the inwall of fluidized bed is provided with thickening layer, weighting material bed of material bottom thickness is identical with thickening layer thickness, to improve sulfurous iron ore reaction efficiency in body of heater, make sulfurous iron ore Thorough combustion.
Can see that existing disclosed boiling furnace device extracts rhenium for the oxidizing roasting of rhenium-containing ore deposit, still there is following problems:
First, because the existing fluidizing furnace body of heater being conventionally used for calcining molybdenum concentrate is an isometrical cylindrical refractory chamber ((Zhang Qixiu, Zhao Qinsheng edits, " tungsten is metallurgical ", in September, 2005,171st page of Fig. 4 ~ 7 molybdenite concentrate fluosolids roasting process flow diagram), after rhenium-containing mineral aggregate contacts with oxygen source and mixes, constantly upwards flow while carry out oxidizing reaction limit, still spend in tempo after mixing pattern flows through discharge port and upwards flow, the dust that flue gas carries constantly enters follow-up dust-removal system by flue, causes Dust Capacity too much, is also difficult to the oxidization time ensureing rhenium; And when the roasting of rhenium-containing ore deposit, ensure the fully oxidized effusion of rhenium, in fluidizing furnace, oxygen level should ensure ReS
2→ Re
2o
7transformation efficiency; Even if adopt above-mentioned various improved procedures, as arrange in body of heater Different Plane fuel gas inlet, arrange dividing plate increase material movement path, double-layer furnace body is set, body of heater and boiling section height is increased, the inwall of fluidized bed arranges thickening layer etc., all can not solve the voloxidation time and roasting efficiency that control rhenium;
Secondly, in flue gas ash removal process, the general bagroom of routine that adopts gathers dust, as Luoyang Luanchuan Molybdenum Industry Group Co., Ltd. (CN201210129459.2) namely adopts the dust-removal system of tornado dust collector and bagroom composition to gather dust, feasible under the processing condition being target product with molybdenum calcining (molybdenum oxide), but because the fiber thermal stability of bagroom is low, usually below 300 DEG C, flue gas need carry out the normal work of radiating and cooling and gas dilution guarantee bagroom in advance, in radiating and cooling and gas dilution, the gaseous state rhenium oxide simultaneously entering flue gas because of oxidation can be mixed in the flue dust retained by bagroom because of decrease temperature crystalline, part rhenium oxide is only had to enter in absorption extraction liquid by drip washing operation, cause rhenium can only carry out partially recycled as byproduct, the extraction recovery of serious reduction rhenium.
These problems above-mentioned, rhenium oxidizing roasting efficiency and evaporation rate is low, the superposition of flue gas ash removal loss factor in i.e. oxidizing roasting process, making to extract rhenium from the oxidizing roasting of rhenium-containing ore deposit obtains the whole flow process of rhenium-containing extracting solution, rhenium extraction recovery is only 50 ~ 70%, have a strong impact on the recycling of rhenium, hinder the fast development of rhenium industry.
Utility model content
The purpose of this utility model is on the basis of existing technology, a kind of boiling furnace device extracting rhenium for oxidizing roasting is provided, to overcome existing oxidizing roasting fluidizing furnace, the rhenium oxidizing roasting efficiency existed in rhenium process is low, rhenium evaporation rate is low, in dust removal process, rhenium loses large problem extracting, the utility model is by the improvement to fluidizing furnace body of heater, dust-removal system, improve oxidizing roasting efficiency and the rhenium evaporation rate in rhenium-containing ore deposit, reduce roasting Dust Capacity, improve production efficiency; Improve dedusting method, reduce the loss of rhenium-containing flue gas in dust removal process; Improve the recycled in its entirety rate that oxidizing roasting mode extracts rhenium, the fast development of rhenium extraction and rhenium application industry can be promoted.
For achieving the above object, the utility model employing technical scheme is:
Extract a boiling furnace device for rhenium for oxidizing roasting, be provided with fluidizing furnace, cloth wind system and dust-removal system, it is characterized in that:
Described fluidizing furnace body of heater is provided with hybrid reaction district and second reaction zone, described second reaction zone is higher than discharge port and be upwards provided with extension diameter section and undergauge section successively along body of heater, described extension diameter section and hybrid reaction district diameter are than 1.1 ~ 1.8:1, extension diameter section and hybrid reaction district combining site are truncated cone-shaped, its longitudinal section isosceles trapezoid base angle is 15 ~ 30o, described undergauge section and hybrid reaction district diameter are than 0.3 ~ 0.5:1, undergauge section and extension diameter section combining site are truncated cone-shaped, its longitudinal section isosceles trapezoid apex angle ss is 110 ~ 145o, described undergauge section outlet is communicated with the exhanst gas outlet on body of heater,
Described cloth wind system is located in the air compartment below hybrid reaction district, is communicated with inlet pipe, is provided with the gas distribution dividing plate being with blast cap between cloth wind system and hybrid reaction district;
Described dust-removal system is provided with 1 ~ 2 grade of tornado dust collector and ceramic element dust-precipitator.
Further, described extension diameter section height is 3 ~ 6m, and undergauge section height is 1 ~ 1.5m.
Further, described cloth wind system includes gas distribution supervisor, gas distribution grid and ring flat-plate, described gas distribution supervisor is arranged between two parties at wind indoor vertical, and gas distribution supervisor sidewall is evenly provided with ventilation hole, the inlet communication of gas distribution supervisor lower end and bottom of furnace body vertical air inlet pipe; Gas distribution supervisor upper end is disposed with horizontal gas grid distributor and ring flat-plate, and described ring flat-plate and gas distribution are responsible for upper horizontal.
Further, be provided with cone section bottom described air compartment, cone section is not highly higher than described gas distribution grid.
Further, described tornado dust collector and the compact setting of ceramic element dust-precipitator, one cyclonic fly-ash separator inlet mouth is directly communicated with described exhanst gas outlet.
Further, described tornado dust collector wall is by inner and be provided with flame retardant coating, thermal insulation layer, common brick layer and grate outward, and the housing of described ceramic element dust-precipitator is provided with thermal insulation layer.
Adopt the utility model, at least there is following beneficial effect:
1, improve furnace binding, improve oxidizing roasting efficiency and rhenium evaporation rate that rhenium in rhenium method is extracted in oxidizing roasting, reduce roasting Dust Capacity, improve production efficiency
The utility model is by arranging extension diameter section and undergauge section in fluidizing furnace body of heater second reaction zone, improve the oxidizing roasting efficiency of rhenium in rhenium-containing ore deposit, particularly, because conventional fluidizing furnace body of heater is an isometrical cylindrical refractory chamber, after rhenium-containing mineral aggregate contacts with oxygen source and mixes, while constantly upwards flow in the oxidizing reaction limit of carrying out sulphide ores, still spend in tempo after mixture flows through discharge port and upwards flow, be difficult to the oxidization time ensureing sulfuration rhenium, and adopt boiling furnace device of the present utility model, in hybrid reaction district below discharge port, the oxidation desulfur reaction of sulphide ores in main generation rhenium-containing ore deposit, sulfuration rhenium participates in reaction hardly, the calcining that oxidation generates is discharged from discharge port, remain a small amount of unreacted sulphide ores, sulfuration rhenium upwards enters second reaction zone together with flue gas, at extension diameter section, rising material upwards velocity of flow reduces, extend and ensure that the residence time of sulfuration rhenium in fluidizing furnace, improve the oxidizing roasting efficiency of rhenium, improve rhenium evaporation rate, the rhenium oxide that oxidation generates is when upwards flowing over undergauge section, and due to the existence of undergauge section, rising material channel narrows, velocity of flow increases, and can accelerate the rhenium oxide that extension diameter section generated and upwards flow, shorten newly-generated rhenium oxide and SO
2duration of contact, therefore, the second reaction zone of the utility model by arranging, by the integrated structure of extension diameter section and undergauge section, can either control the oxidizing roasting time of rhenium, turn avoid the rhenium oxide of generation by SO
2inverse reduction, relative to the fluidizing furnace of the isometrical cylindrical furnace of routine, substantially increases the evaporation rate of rhenium,
And, in conventional fluidizing furnace, flue gas carries dust and upwards flows by certain flow rate, the dust that flue gas carries is had little time sedimentation and is namely discharged by exhanst gas outlet, cause Dust Capacity too much, and the second reaction zone structure of the utility model by by fluidizing furnace Proper Design being hybrid reaction district and the band extension diameter section section on it, flue gas carries dust when entering extension diameter section, expanding effect makes dust ascent rate reduce, move downward under gravity and enter hybrid reaction district, discharge from discharge port, decrease the Dust Capacity that rising flue gas carries, reduce the Dust Capacity that stove is returned in roasting, specific productivity improves relatively, reduce enterprise cost.
2, improve dedusting method, reduce the loss of rhenium-containing flue gas in dust removal process
Rhenium oxide Re
2o
7boiling point is 361 DEG C, and rhenium-containing flue gas point is being left away in the process of solid dust, the Re of volatilization state
2o
7be easy to be mixed in the dust be trapped because of cooling, affect the recycled in its entirety rate of rhenium, the utility model adopts the high-temperature dust removal system be made up of tornado dust collector and ceramic element dust-precipitator to carry out flue gas ash removal and operates, compared with the low temperature bag-type dust of routine, the hot conditions of flue gas in dust removal process can be kept, rhenium-containing flue-gas temperature is made to remain on more than 400 DEG C, thus ensure that in dust removal process, rhenium oxide remains at gaseous phase, effectively avoid the rhenium in depositing dust process to lose, improve the rate of recovery of rhenium;
And, the utility model adopts tornado dust collector and ceramic element dust-precipitator combination to carry out dust removal operation, Large stone dust is first removed by the dust removal with machine effect of tornado dust collector, remain tiny grit firmly to tackle through the rigidity of ceramic element dust-precipitator again and gather dust, efficiency of dust collection, more than 99.5%, improves the purity of dedusting flue gas.
3, improve the rate of recovery that oxidizing roasting mode extracts rhenium, facilitate the fast development that rhenium extracts industry
Be rhenium oxide by the sulfuration rhenium oxidizing roasting in rhenium-containing ore deposit, it is the first step that oxidizing roasting mode carries out Rhenium recovery flow process, the oxidizing roasting efficiency of rhenium and the height of evaporation rate, most important to the height of Rhenium recovery rate in whole leaching process, oxidizing roasting is more complete, the evaporation rate of rhenium is higher, mean that the rhenium remained in dust and calcining is fewer, enter gas and finally to enter the rhenium of rhenium-containing extracting solution more, rhenium extracts more complete, the utility model is by improving fluidizing furnace furnace binding and dust-removal system, the distillation evaporation rate of rhenium is made to bring up to almost 100%, and the rhenium oxide after volatilization is by high-temperature dust removal mode and dust separation, make most rhenium elements in rhenium-containing ore deposit through oxidizing roasting, dedusting enters follow-up gas absorption flow process, the oxidizing roasting mode in industry that improves extracts the rate of recovery of rhenium, oxidizing roasting can be made, Rhenium recovery rate after dedusting reaches more than 99%, facilitate the fast development of rhenium extraction and rhenium application industry, achieve utilization of resources.
Accompanying drawing explanation
Fig. 1 is the utility model embodiment 1 boiling furnace device structural representation;
Fig. 2 is boiling furnace device cloth wind system local structure enlarged view in Fig. 1;
Fig. 3 is A ~ A direction view in Fig. 2;
Fig. 4 is B ~ B direction view in Fig. 2;
Fig. 5 is that in Fig. 1, boiling furnace device plenum chamber structure improves schematic diagram.
In accompanying drawing: 1, body of heater; 2, hybrid reaction district; 3, discharge port; 4, extension diameter section; 5, undergauge section; 6, exhanst gas outlet; 7, air compartment; 8, inlet pipe; 9, gas distribution dividing plate; 10, opening for feed; 11, cloth wind system; 12, gas distribution supervisor; 13, gas distribution grid; 14, ring flat-plate; 15, flange hole; 16, distribution hole; 17, wind distributing hole; 18, tornado dust collector; 19, ceramic element dust-precipitator; 20, dedusting gas outlet; α, base angle; β, drift angle.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further elaborated, but protection domain of the present utility model includes but not limited to this.
Embodiment one:
The utility model is used for oxidizing roasting and extracts the boiling furnace device structure of rhenium as shown in Figure 1, is provided with fluidizing furnace, cloth wind system 11 and dust-removal system;
Fluidizing furnace bottom is provided with gas distribution dividing plate 9 i.e. furnace bottom with holes, for being provided with the air compartment 7 of inlet pipe 8 below furnace bottom, inlet pipe 8 is connected with air feed system (not shown), fluidizing furnace body of heater 1 along furnace bottom upwards 1.0 ~ 1.5m At The Height be respectively equipped with opening for feed 10 and discharge port 3, opening for feed 10 is a little more than discharge port 3, body of heater 1 is provided with hybrid reaction district 2 and second reaction zone, second reaction zone is higher than discharge port 3 and be upwards provided with extension diameter section 4 and undergauge section 5 successively along body of heater 1, extension diameter section 4 and hybrid reaction district 2 diameter are than 1.1 ~ 1.8:1, extension diameter section 4 and hybrid reaction district 2 combining site are truncated cone-shaped, its longitudinal section isosceles trapezoid base angle is 15 ~ 30o, undergauge section 5 and hybrid reaction district 2 diameter are than 0.3 ~ 0.5:1, undergauge section 5 and extension diameter section 4 combining site are truncated cone-shaped, its longitudinal section isosceles trapezoid apex angle ss is 110 ~ 145o, undergauge section 5 outlet is communicated with the exhanst gas outlet 6 on body of heater 1,
When adopting this boiling furnace device to extract rhenium for the oxidizing roasting of rhenium-containing ore deposit, be crushed to breeze about 200 orders as rich rhenium concentrated molybdenum ore or rich rhenium brightness lindgrenite, by the automatic feed system (not shown) be communicated with opening for feed 10, by set amount uniformly continous, mineral aggregate is conveyed in fluidizing furnace;
Oxidizing roasting is extracted in rhenium process, the structure of main reaction region fluidizing furnace is to the residence time of mineral aggregate in stove, the evaporation rate that rhenium enters flue gas has extreme influence, be different from the isometrical cylindrical refractory chamber of conventional fluidizing furnace body of heater, the extension diameter section 4 that the utility model is arranged in second reaction zone, the residence time of rhenium oxidizing roasting reaction in second reaction zone can be extended, thus improve oxidizing roasting efficiency and rhenium evaporation rate, extension diameter section 4 and hybrid reaction district 2 diameter are than 1.1 ~ 1.8:1, base angle is when 15 ~ 30o scope, the rational rhenium oxidizing roasting time can be ensured, when α is more than 30o, extension diameter section 4 diameter is excessive when exceeding 1.8 times of hybrid reaction district 2 diameter, rhenium oxidizing roasting duration extends too much, not only throughput can be reduced, and generate rhenium oxide and dust long for duration of contact, reduce rhenium evaporation rate on the contrary, the undergauge section 5 arranged on extension diameter section 4, the rhenium oxide volatilized can be made to discharge fluidizing furnace body of heater 1 as early as possible, shorten the duration of contact of rhenium oxide and dust and sulfurous gas, practice shows, when undergauge section 5 is the scope of 110 ~ 145o with hybrid reaction district 2 diameter than 0.3 ~ 0.5:1, apex angle ss, the rhenium oxide volatilized can discharge body of heater 1 fast, also can not affect the fully oxidized roasting of rhenium in extension diameter section 4, in practice, preferred extension diameter section 4 height is at 3 ~ 6m, and undergauge section 5 height is at 1 ~ 1.5m, and to obtain preferably oxidizing roasting effect, the flue gas that roasting generates carries dust and discharged by exhanst gas outlet 6 through undergauge section 5, and calcining is discharged from discharge port 3 and collected,
Cloth wind system 11 is located in the air compartment 7 below hybrid reaction district 2, is communicated with inlet pipe 8, and the gas distribution dividing plate 9 of band blast cap is arranged between cloth wind system 11 and hybrid reaction district 2, provides fluidization power and oxygen source for extracting in rhenium process in oxidizing roasting;
Cloth wind system 11 concrete structure as shown in Figure 2, include gas distribution supervisor 12, gas distribution grid 13 and ring flat-plate 14, gas distribution supervisor 12 vertical settings placed in the middle in air compartment 7, gas distribution is responsible for 12 sidewalls and is evenly provided with ventilation hole (not shown), and gas distribution is responsible for the inlet communication of 12 lower ends and body of heater 1 bottom vertical inlet pipe 8, gas distribution is responsible for 12 upper ends and is disposed with horizontal gas grid distributor 13 and ring flat-plate 14, described ring flat-plate 14 is responsible for 12 upper horizontal with gas distribution, the concrete structure of gas distribution grid 13 and ring flat-plate 14 respectively as shown in Figure 3 and Figure 4, gas distribution grid 13 side margins is responsible for 12 by flange hole 15 with gas distribution and is connected, gas distribution grid 13 is provided with uniform distribution hole 16, ring flat-plate 17 internal ring wall and gas distribution are responsible for 12 and are flushed, and ring flat-plate 17 is evenly provided with wind distributing hole 17, during concrete enforcement, what roasting needed can adopt pure industrial oxygen and the gas mixture purified air containing oxygen air, like this, introduce gas distribution by inlet pipe 8 and be responsible for 12 pass through containing the oxygen air draught limit ventilation hole that limit evenly arranges from sidewall that upwards flows, air-flow is cut into even tiny air-flow, be responsible for along gas distribution the air-flow that 12 internal flows to gas distribution is responsible for 12 upper ends and evenly cut distribution by gas distribution grid 13 distribution hole 16, be close to disorderly air upflow that gas distribution is responsible for 12 outer side walls then to be distributed by the wind distributing hole 17 on ring flat-plate 14 in upwards flow process, thus make the air-flow entering gas distribution supervisor 12 form stable air upflow, air upflow enters in hybrid reaction district 2 through gas distribution dividing plate 9, realize fully contacting of mineral aggregate and gas, the oxidizing roasting efficiency of further raising rhenium and rhenium extraction yield,
During concrete enforcement, the structure of air compartment 7 also can carry out the design improvement being beneficial to even distributing wind, wherein a kind of improved procedure as shown in Figure 5, cone section 21 is provided with bottom air compartment 7, cone section 21 is not highly higher than described gas distribution grid 13, in order to improve the even distributing wind of gas at cloth wind system 11, improve rhenium oxidizing roasting efficiency;
The rhenium oxide that oxidizing roasting generates enters in flue gas, flue gas carries again the dust of inlet amount about 20% simultaneously, need to carry out dust separation, when dust-removal system temperature is lower than rhenium compound boiling point, the rhenium oxide of volatilization state not only can be mixed in dust because of cooling, and rhenium disulfide and rhenium salt can be become by the sulphur dioxide reduction in flue gas, affect the rate of recovery of rhenium; In the utility model, dust-removal system includes 1 grade of tornado dust collector 18 and ceramic element dust-precipitator 19, and baking flue gas first through tornado dust collector dedusting, then is gathered dust by ceramic element dust-precipitator; During concrete enforcement, tornado dust collector and ceramic element dust-precipitator are as far as possible by the compact setting in place, one cyclonic fly-ash separator inlet mouth is directly communicated with described exhanst gas outlet, causes calorific loss, avoid the rhenium in flue gas to lose to reduce high temperature rhenium-containing flue gas by long flue; Ceramic element dust-precipitator is typically provided with housing, ceramic filter filter core, pulse cleaning system and soot cleaning system, gather dust in process, particle dust in high-temperature roasting flue gas is deposited in filter core outside surface gradually and forms ash cake, increase Pressure Drop with ash cake thickness to increase, blowback system carries out blowback cleaning to filter core in time, effective removing also by dust collection in dust-precipitator bottom, realizes gathering dust online; When implementing, preferred tornado dust collector wall is by inner and be provided with flame retardant coating, thermal insulation layer, common brick layer and grate outward, ceramic element dust-precipitator housing arranges thermal insulation layer, with better ensure the hot conditions of dust-removal system with, avoid rhenium-containing flue gas to lose because of cooling through dust-removal system;
embodiment 1:
With rich rhenium brightness lindgrenite for raw material, utilize the boiling furnace device shown in Fig. 1 to adopt oxidizing roasting mode to extract rhenium in mineral, raw material rhenium-containing amount is 530g/t, and its technical process is as follows:
The first step, rhenium-containing ore deposit oxidizing roasting: rich rhenium brightness lindgrenite is sent into boiling furnace device, contacts with containing oxygen air and carries out roasting, fluidizing furnace body of heater 1 extension diameter section 4 compares 1.4:1 with hybrid reaction district 2 diameter, extension diameter section 4 and combining site longitudinal section, hybrid reaction district 2 isosceles trapezoid base angle are 22o, extension diameter section 4 height 4.5m, undergauge section 5 compares 0.3:1 with hybrid reaction district 2 diameter, undergauge section 5 and extension diameter section 4 combining site longitudinal section isosceles trapezoid apex angle ss are 130o, undergauge section 5 height 1.1m, what roasting needed adopts pure industrial oxygen and the gas mixture purified air containing oxygen air, the coefficient of excess air controlled containing oxygen air is 2.0%, oxygen partial pressure 100KPa, introduce gas distribution by inlet pipe 8 and be responsible for 12 pass through containing the oxygen air draught limit ventilation hole that limit evenly arranges from sidewall that upwards flows, air-flow is cut into even tiny air-flow, be responsible for along gas distribution the air-flow that 12 internal flows to gas distribution is responsible for 12 upper ends and evenly cut distribution by gas distribution grid 13 distribution hole 16, be close to disorderly air upflow that gas distribution is responsible for 12 outer side walls then to be distributed by the wind distributing hole 17 on ring flat-plate 14 in upwards flow process, form stable air upflow, enter in hybrid reaction district 2 through gas distribution dividing plate 9, mix with the rich rhenium ore deposit entering boiling furnace device, controlling hybrid reaction district maturing temperature is 660 DEG C, the flue gas that roasting generates carries dust and is discharged by exhanst gas outlet 6 through undergauge section 5, calcining discharges collection by discharge port 3,
Second step: baking flue gas high-temperature dust removal
Baking flue gas is introduced dust-removal system, and dust-removal system is provided with 1 grade of cyclone dust removal and ceramic element gathers dust, and in dust removal process, keeps flue gas temperature in dust-removal system to be 400 DEG C, obtains dedusting gas and dust after dedusting;
The dust that dedusting obtains can return boiling furnace device roasting again, and dedusting gas can be introduced gas absorption system and carry out spray-absorption and obtain rhenium-containing extracting solution, absorbs the treated rear discharge up to standard of tail gas.
From result of implementation, oxidizing roasting rich rhenium brightness lindgrenite under above-mentioned implementation condition, in oxidizing roasting step, rhenium extraction recovery reaches 99.9%, and dust returns furnace volume 8.9%, and the Rhenium recovery rate after high-temperature dust removal reaches the high efficiency extraction that 99.2% achieves rhenium.
Claims (6)
1. extract a boiling furnace device for rhenium for oxidizing roasting, be provided with fluidizing furnace, cloth wind system (11) and dust-removal system, it is characterized in that:
Described fluidizing furnace body of heater (1) is provided with hybrid reaction district (2) and second reaction zone, described second reaction zone is higher than discharge port (3) and be upwards provided with extension diameter section (4) and undergauge section (5) successively along body of heater (1), described extension diameter section (4) and hybrid reaction district (2) diameter are than 1.1 ~ 1.8:1, extension diameter section (4) and hybrid reaction district (2) combining site are truncated cone-shaped, its longitudinal section isosceles trapezoid base angle is 15 ~ 30o, described undergauge section (5) and hybrid reaction district (2) diameter are than 0.3 ~ 0.5:1, undergauge section (5) and extension diameter section (4) combining site are truncated cone-shaped, its longitudinal section isosceles trapezoid apex angle ss is 110 ~ 145o, described undergauge section (5) outlet is communicated with the exhanst gas outlet (6) on body of heater (1),
Described cloth wind system (11) is located in the air compartment (7) of below, hybrid reaction district (2), is communicated with, is provided with the gas distribution dividing plate (9) being with blast cap between cloth wind system (11) and hybrid reaction district (2) with inlet pipe (8);
Described dust-removal system is provided with 1 ~ 2 grade of tornado dust collector (18) and ceramic element dust-precipitator (19).
2. a kind of boiling furnace device extracting rhenium for oxidizing roasting according to claim 1, is characterized in that: stating extension diameter section (4) is highly 3 ~ 6m, and undergauge section (5) is highly 1 ~ 1.5m.
3. a kind of boiling furnace device extracting rhenium for oxidizing roasting according to claim 1, it is characterized in that: described cloth wind system (11) includes gas distribution supervisor (12), gas distribution grid (13) and ring flat-plate (14), described gas distribution supervisor (12) vertical setting placed in the middle in air compartment 7, gas distribution supervisor (12) sidewall is evenly provided with ventilation hole, the inlet communication of gas distribution supervisor (12) lower end and body of heater (1) bottom vertical inlet pipe (8); Gas distribution supervisor (12) upper end is disposed with horizontal gas grid distributor (13) and ring flat-plate (14), and described ring flat-plate (14) and gas distribution are responsible for (12) upper horizontal.
4. a kind of boiling furnace device extracting rhenium for oxidizing roasting according to claim 1, is characterized in that: described air compartment (7) bottom is provided with cone section (21), and cone section (21) is not highly higher than described gas distribution grid (13).
5. a kind of boiling furnace device extracting rhenium for oxidizing roasting according to claim 1, it is characterized in that: described tornado dust collector (18) and ceramic element dust-precipitator (19) compact setting, one cyclonic fly-ash separator (18) inlet mouth is directly communicated with described exhanst gas outlet (6).
6. a kind of boiling furnace device extracting rhenium for oxidizing roasting according to claim 1, it is characterized in that: described tornado dust collector (18) wall is by inner and be provided with flame retardant coating, thermal insulation layer, common brick layer and grate outward, and the housing of described ceramic element dust-precipitator (19) is provided with thermal insulation layer.
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| CN201520851693.5U CN205133692U (en) | 2015-10-30 | 2015-10-30 | A fluidized bed furnace device for oxidizing roasting draws rhenium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108191462A (en) * | 2018-01-19 | 2018-06-22 | 平罗县祥美化工有限公司 | Rotating disc type fluidized bed furnace |
| CN115468413A (en) * | 2022-08-17 | 2022-12-13 | 安徽华铂再生资源科技有限公司 | Vertical continuous drying roasting device |
-
2015
- 2015-10-30 CN CN201520851693.5U patent/CN205133692U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108191462A (en) * | 2018-01-19 | 2018-06-22 | 平罗县祥美化工有限公司 | Rotating disc type fluidized bed furnace |
| CN115468413A (en) * | 2022-08-17 | 2022-12-13 | 安徽华铂再生资源科技有限公司 | Vertical continuous drying roasting device |
| CN115468413B (en) * | 2022-08-17 | 2024-07-16 | 安徽华铂再生资源科技有限公司 | Vertical continuous drying roasting device |
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