CN103276195A - Stone coal vanadium ore shaft roasting method and system - Google Patents
Stone coal vanadium ore shaft roasting method and system Download PDFInfo
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- CN103276195A CN103276195A CN2013101672054A CN201310167205A CN103276195A CN 103276195 A CN103276195 A CN 103276195A CN 2013101672054 A CN2013101672054 A CN 2013101672054A CN 201310167205 A CN201310167205 A CN 201310167205A CN 103276195 A CN103276195 A CN 103276195A
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- 239000003245 coal Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 38
- 229910052720 vanadium Inorganic materials 0.000 title abstract description 32
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title abstract description 31
- 239000004575 stone Substances 0.000 title abstract description 13
- 239000007789 gas Substances 0.000 claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 230000001590 oxidative effect Effects 0.000 claims abstract description 16
- 239000000654 additive Substances 0.000 claims abstract description 14
- 230000000996 additive effect Effects 0.000 claims abstract description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 239000012495 reaction gas Substances 0.000 claims abstract description 13
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000428 dust Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 238000000227 grinding Methods 0.000 claims abstract description 5
- 238000005453 pelletization Methods 0.000 claims abstract description 5
- 210000000988 bone and bone Anatomy 0.000 claims description 59
- 239000002994 raw material Substances 0.000 claims description 23
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 238000002386 leaching Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 4
- 235000009508 confectionery Nutrition 0.000 claims description 4
- 238000013467 fragmentation Methods 0.000 claims description 4
- 238000006062 fragmentation reaction Methods 0.000 claims description 4
- 239000003345 natural gas Substances 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 4
- 159000000007 calcium salts Chemical class 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 239000003595 mist Substances 0.000 claims description 2
- 159000000000 sodium salts Chemical group 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 230000000977 initiatory effect Effects 0.000 abstract 1
- 239000008188 pellet Substances 0.000 abstract 1
- 230000008569 process Effects 0.000 description 10
- 238000005265 energy consumption Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000001354 calcination Methods 0.000 description 4
- 238000005261 decarburization Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000003610 charcoal Substances 0.000 description 3
- 238000005262 decarbonization Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000003500 flue dust Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000002308 calcification Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000009856 non-ferrous metallurgy Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 description 1
- 150000003682 vanadium compounds Chemical class 0.000 description 1
- 229910001784 vanadium mineral Inorganic materials 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention provides a stone coal vanadium ore shaft roasting method. The method comprises the following steps: crushing stone coal vanadium ore, mixing, finely grinding and pelletizing with an additive and sodium peroxide, drying the obtained raw nodules and feeding the raw nodules into the shaft; igniting combustible carbon in the stone coal pellet through an ignition system, heating the shaft, and simultaneously initiating an oxygen production reaction, wherein the temperature in the shaft is 800-850 DEG C, and the oxygen content is more than 30 percent; mixing circulating top gas and preheated air to serve as reaction gas, and introducing the reaction gas into the shaft for oxidizing and roasting the raw nodules for 2-3 hours; and cooling and discharging the clinker, and crushing the clinker for V2O5 extraction; and removing the dust and desulfurating the roasted top gas, allowing the partial top gas to pass through a heat exchanger for preheating the air, and mixing the partial top gas and the preheated air to serve as the reaction gas so as to input into the shaft. The reaction gas heating device is not required, and the energy-saving effect is achieved; CO2 is consumed in the shaft by sodium peroxide so as to generate oxygen, and the oxidizing atmosphere is intensified; the top gas is purified and recycled, the oxygen utilization rate is improved, and the pollution of dust and harmful gas is reduced; and moreover, the parameters such as roasting atmosphere, temperature, time and the like are easily controlled.
Description
Technical field
The present invention relates to technical field of chemistry and chemical engineering, be specifically related to a kind of bone coal navajoite furnace baking method and system.
Background technology
Vanadium is global scarce resource and grand strategy metal, because it has very high tensile strength, hardness, fatigue resistance and performance such as erosion resistance preferably, be widely used in industries such as iron and steel, nonferrous metallurgy and chemical industry, wherein be used for Iron And Steel Industry more than 85%.Along with Iron And Steel Industry to excellent, smart, special formula to development, the application of high quality vanadium steel is with increasingly extensive, the expert estimates that the consumption of global vanadium is 10.4% in the compound annual growth rate of 2010-2015, finally reaches 11.5 ten thousand tons, vanadium industry development potentiality are very big.
The nearly 65 types vanadium minerals that contains in the world, the main raw material of industrial vanadium product has vanadium titano-magnetite, bone coal, oil lime-ash, waste vanadium catalyst and bauxite etc.The bone coal resource of China is very abundant, and proven reserve are 618.8 hundred million tons, V
2O
5Grade is many at 0.3%-1.0%, wherein w (V
2O
5V in the bone coal of) 〉=0.5%
2O
5Reserves are 7707.5 ten thousand tons, are V in China's vanadium titano-magnetite
2O
56.7 times of reserves.Bone coal is the valuable source that vanadium metal extracts, and vanadium mainly exists with lower valency, and especially the trivalent vanadium compound with the equal indissoluble of soda acid exists.At present, the more employing raw ore of the method for extracting vanadium from stone coal (or the lime-ash after the decarburization) roasting-leaching-vanadium liquid purification-precipitation calcining method.Roasting is the committed step in the extracting vanadium from stone coal process, and roasting effect directly influences the vanadium leaching yield, thereby determines the vanadium total yield of whole process flow to a certain extent.
The bone coal roasting both can remove the carbon in the bone coal, can be oxidized to the vanadium of lower valency as far as possible high valence state, generate the vanadate of water soluble, acid or alkali with reactive metal oxide in the material again.In the bone coal roasting process, the factor that influences roasting effect mainly is additive types and consumption, the roasting type of furnace, maturing temperature, roasting time, calcination atmosphere etc.Maturing temperature determines the possibility of oxidizing reaction and thing phase change, and roasting time determines the carrying out of oxidizing reaction and the degree of thing phase change, and furnace atmosphere determines the effect of oxidizing reaction and thing phase change.
In existing bibliographical information and the industrial application, press the additive classification, roasting can be divided into sodium roasting, calcification baking, oxidizing roasting and composite additive roasting, associated patent has: (1) a kind of sodium modification, alcination and vanadium extraction technology of stone coal (CN101363084A), (2) a kind of stone coal vanadium-extracting roasting technique (CN101260459), (3) novel environment-protection compound additive roasted by bone coal vanadium ore (CN101177738) etc.; By type of furnace classification, can be divided into flat kiln, shaft kiln, rotary kiln, tunnel furnace, multiple hearth furnace, fluidizing furnace, fluidized-bed etc., associated patent has: the high roasting shaft kiln (CN202092446U) that transforms of (1) extracting vanadium from stone coal, (2) a kind of rotary kiln for extracting vanadium from stone coal (N101762153A), (3) a kind of Vanadium Pentoxide in FLAKES oxidizing roasting stove (CN201411379).Present bone coal sinter process, low, the shortcomings such as efficiency is low, contaminate environment of ubiquity vanadium transformation efficiency.
Patent CN101857915A discloses a kind of pelletizing and calcination method of bone coal navajoite lime-ash, and described method comprises: NaCl, the quality of adding quality in the bone coal navajoite lime-ash and be bone coal navajoite lime-ash quality 1%-5% are the CaF of bone coal navajoite lime-ash quality 2%-7%
2With quality be the CaCO of bone coal navajoite lime-ash quality 10%-15%
3Every kg mixture is allocated hard coal or the bone coal of 1460-2100kJ into, mixing is finely ground to 80 orders-150 order and obtains the raw material powder, adding quality in the raw material powder is the water of raw material opaque amount 8%-20%, and granulation balling-up after the mechanical stirring obtains the raw material ball of sphere diameter 3-15mm, through the feeding device at the body of heater top body of heater of packing into, finish roasting under the temperature in 800-900 ℃ stove, the material after the roasting is discharged through the dumping device of bottom of furnace body, obtains for V after the cooling
2O
5The grog that leaches (usually with dilute hydrochloric acid or dilute sulphuric acid leaching).This method heat energy utilization rate height, constant product quality, production cost are low.
Yet use this roasting method, fuel such as the hard coal of interpolation are to the follow-up V that leaches from grog
2O
5Unfavorable, can cause the increase of acid consumption, solid-liquid separation difficulty; And the document does not produce heating installation and the type of heating of high temperature specifically in the open oven; The hard coal that adds or bone coal can produce CO in combustion processes
2, CO
2The too high meeting of dividing potential drop causes the regeneration of CO, weakens oxidizing atmosphere in the shaft furnace, is unfavorable for the bone coal oxidation of vanadium at a middle or low price.
Usual means about the bone coal roasting has: flat kiln, multiple hearth furnace, rotary kiln, fluidizing reactor, marching type roasting kiln and shaft kiln.
Wherein flat kiln is the main equipment of China's stone coal vanadium-extracting roasting operation at present, and its advantage is: equipment is simple, less investment, big, the technology maturation of turndown ratio, the length of artificial control roasting time easily; Main drawback is that transformation efficiency is low, and equipment capacity is low, energy consumption is high, floor space is big, mechanization degree is low, and most of private vanadium extraction factory is the maximizations of pursuit fund interests, and untreated waste gas directly to airborne release, is done great damage to environment.Government department closes down the flat kiln production method of this type of high energy consumption, high pollution, poor efficiency just gradually.
The advantage of multiple hearth furnace is can adjust the number of plies within the specific limits to reach the residence time of material in stove, can provide the required oxygen of bone coal roasting, flue gas can carry out waste heat recovery simultaneously by blasting air and extracting the maturing temperature that flue gas be controlled each layer.Shortcoming is that equipment capacity is low, investment is big.
Rotary kiln replaces flat kiln gradually in recent years, becomes one of important vanadium extraction equipment of China.Advantage be simple in structure, safeguard easily, mechanization degree is high, equipment capacity is big, oxidizing atmosphere is good in the kiln, utilize the rotation of kiln that material is constantly rolled, be conducive to that roasting is carried out, the specification by adjusting kiln and operating parameters can control the residence time, the flue gas of furnace charge in kiln and can carry out waste heat recovery.Shortcoming: thermal zone too short, the roasting material is short in residence time of high-temperature zone, causes that energy utilization rate is low, investment is big, energy consumption is high, maturing temperature is difficult to control, needs regulate control by pre-decarburization.
Bone coal has certain calorific value, and in theory, the bone coal roasting is not need external heat source, go but also will derive unnecessary heat, but rotary kiln is difficult to accomplish the heat derivation unnecessary.In other words, come the bone coal raw ore of roasting 100% to be difficult to realize desired temperature controlling with rotary kiln.Be to adopt other mode (as: using the fluidization fluidized bed roasting) to take off charcoal earlier the part bone coal in the reality, the bone coal that will take off charcoal then with send into rotary kiln after the bone coal that does not take off charcoal mixes by a certain percentage, to reach the effect of control temperature.
The advantage of fluidizing reactor is to conduct heat and mass transfer effect is good, can effectively control maturing temperature, can fully reclaim heat that the bone coal roasting produces again, specific productivity that biggest advantage also is it is big, fume afterheat can adopt waste heat boiler to reclaim.But fluidized bed roasting dust rate height (dust rate can reach 40%-50%), the residence time of flue dust in stove are extremely short, do not reach the desired required time of roasting bone coal of various new process for extracting vanadium from stone coal far away.
The marching type roasting kiln is to grow up on the basis of ceramic industry, the widely used tunnel furnace of making coal gangue brick industry, is used to contain the roasting of vanadium raw materials in recent years, can be divided into preheating zone, roast area and cooling zone in the kiln.These kiln furnitures have strong points such as maturing temperature, time, atmosphere be easy to control, but require that the bulk level land is arranged, and construction investment is bigger, and energy consumption is high and need to adopt high-grade fuels such as Sweet natural gas or coal gas, the full armrest work industry that stacks bricks in addition, and labour intensity is bigger.
Flat kiln is backward in technique, and it is superseded or restricted to belong to industry restructuring; Fluidizing reactor is subjected to the constraint that dust rate is too high and flue dust is lacked at residing time in furnace; Not inquiring multiple hearth furnace as yet and be applied to the example of bone coal roasting, mainly is that the low and investment of the specific productivity of multiple hearth furnace is put into practice greatly and not; When the problem of rotary kiln is roasting to difficult control of temperature; The investment of marching type roasting kiln is big, energy consumption is high, hinders industrial application.Influence the extracting vanadium from stone coal enterprise reason that industry produces that maximizes, mainly be the selection of roasting apparatus suitably whether, also relate to the further improvement of sinter process simultaneously.The selection of roasting apparatus need be taken all factors into consideration in conjunction with local conditions according to the bone coal characteristics, preferably adopt energy-conserving and environment-protective, be convenient to control, the oxidation efficiency height, take up an area of less, the combustion equipment of less investment, shaft furnace satisfies above requirement.
Summary of the invention
The objective of the invention is to solve problems of the prior art, the efficient roasting method of a kind of bone coal navajoite and system are provided, particularly a kind of bone coal navajoite furnace baking method and system.
The objective of the invention is to be achieved through the following technical solutions:
A kind of bone coal navajoite furnace baking method comprises:
Feed shaft furnace oxidizing roasting raw material ball in the lump as reaction gas after the top gas of step 3, circulation and the air mixed after the preheating;
The cold gas of step 5, shaft furnace cooling section through cooling dedusting, dehydration and pressurization, is returned the shaft furnace cooling section and is recycled after grog is cooled off;
The top gas that step 6, shaft furnace top are discharged is after dedusting, desulfurization, and a part is by the interchanger preheated air, and another part mixes with preheated air as reaction gas feeding shaft furnace and recycles.
In the described step 1 bone coal navajoite is crushed to granularity less than 10 orders, mixes with additive, sodium peroxide, fine grinding becomes granularity to account for raw material powder more than 80% less than 200 orders, the raw material ball diameter of making is 9-16mm.
Additive is sodium salt, calcium salt or composite additive in the described step 1, and binding agent is the organic or inorganic binding agent.
Oxygen making reaction is the CO that sodium peroxide and bone coal burning generate in the described step 2
2Reaction generates O
2, not only increased oxygen concentration in the shaft furnace, consumed part CO in the shaft furnace simultaneously
2, reduced the load of follow-up decarbonization process.
Air can be preheated to 150-250 ℃ in the described step 3, and mixing the back temperature with the top gas of circulation is 250-350 ℃.
Raw material ball is in shaft furnace roasting 2-3 hour in the described step 3.
The grog cooling temperature is below 200 ℃ in the described step 4.
Heated cold gas adopts the mist cooling cleaning apparatus in the described step 5.
Top gas adopts high-temperature dust removing device and high temperature continuous desulfurization device in the described step 6.
The used system of bone coal navajoite furnace baking method according to claim 1, it is characterized in that, comprise shaft roasting device (1), cleaning apparatus (2), desulfurizer (3), interchanger (4), spray column (5), gas-liquid separator (6), compressor (7), described shaft roasting device (1) comprises feeding unit (11), shaft furnace body (12) and dumping device (13), wherein feeding unit (11) is connected with dumping device (13) with vertical body of heater (12) successively, the top gas export pipeline of described vertical body of heater (12) successively with cleaning apparatus (2), desulfurizer (3), interchanger (4) connects, described desulfurizer (3) successively with interchanger (4), vertical body of heater (12) is connected, the cold gas export pipeline of described vertical body of heater (12) successively with spray column (5), gas-liquid separator (6), compressor (7), the cold gas entrance pipe of vertical body of heater (12) is connected.
Use beneficial effect of the present invention:
(1) oxidation efficiency height:
A) CO of sodium peroxide and bone coal burning generation
2Reaction generates O
2, not only increased oxygen concentration in the shaft furnace, consumed part CO in the shaft furnace simultaneously
2, reduced the load of follow-up decarbonization process;
B) adopt shaft furnace oxidizing roasting bone coal navajoite, raw material ball and oxygen relative countercurrent movement in stove have not only strengthened exchange and the utilization of heat, and have prolonged the oxidation time of vanadium at a low price, have improved the transformation efficiency of vanadium;
(2) energy-conservation: as at first not need the heating unit of oxidative reaction gas, greatly reduce energy consumption; Secondly effectively recycle the heat of top gas, improved the heat energy utilization rate (top gas after the purification, a part are used for decarburization emptying behind the preheated air, another part directly and the air mixed after the preheating as reaction gas);
(3) environmental protection: top gas has reduced dust and sulfurous gas pollution on the environment through dedusting and desulfurization;
(4) throughput height: the unit volume productivity of shaft furnace is big;
(5) condition is easily controlled: processing parameters such as calcination atmosphere, temperature and time are controlled easily, and the suitability of technology is wide.
Description of drawings
Fig. 1 is the process flow sheet of a kind of bone coal navajoite furnace baking method of the present invention and system
1, shaft roasting device 2, cleaning apparatus 3, desulfurizer 4, interchanger
5, spray column 6, gas-liquid separator 7, compressor
11, feeding unit 12, shaft furnace body 13, dumping device
Embodiment
For better explanation the present invention, below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described.
As shown in Figure 1, the processing step of this system comprises:
(1) bone coal navajoite is crushed to 0-2mm, add this raw ore 12% composite additive, 15% sodium peroxide, be finely ground to granularity after the mixing and account for raw material powder more than 85% less than 200 orders, in the raw material powder, add water and binding agent, mix the back and in balling head, make ball, obtain the raw material ball of sphere diameter 9-16mm;
(2) described raw material ball is after 120 ℃ of oven dry, and is through the feeding unit at the shaft furnace top body of heater of packing into, mobile from top to bottom;
(3) transport portion Sweet natural gas and air mixed by ignite flammable carbon in the bone coal pelletizing of spark electrode, cause oxygen making reaction in the time of the heating shaft furnace, temperature control is at 800-850 ℃ in the shaft furnace, and oxygen level is 35%-40%;
(4) temperature is 250 ℃-300 ℃ after Xun Huan top gas and the air mixed after the preheating, feeds shaft furnace oxidizing roasting raw material ball as reaction gas in the lump;
(5) reaction gas enters shaft furnace, flows the raw material ball 2h of oxidizing roasting inverse motion in shaft furnace from descending;
(6) grog after roasting is finished is cooled to below 200 ℃ through shaft furnace bottom cooling section, is discharged by the bottom discharge device, and broken back is used for V
2O
5Leaching;
(7) after the cold gas of shaft furnace bottom cooling section is cooled off grog, pass through spray column, gas-liquid separator and compressor successively, return the shaft furnace cooling section again and recycle;
(8) top gas is after the purification of cleaning apparatus, desulfurizer, and a part is by decarburization emptying behind the interchanger preheated air, and the air after another part and the preheating directly mixes as reaction gas feeding shaft furnace.
The present invention does not compared with prior art at first need external heat source, greatly reduces energy consumption; The CO that next sodium peroxide and bone coal burning generate
2Reaction generates O
2, not only strengthened oxidizing atmosphere, and consumed part CO in the shaft furnace
2, reduced the load of follow-up decarbonization process; Last effectively recycle the heat of top gas, improved the heat energy utilization rate.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (10)
1. a bone coal navajoite furnace baking method is characterized in that, comprising:
Step 1, with the bone coal navajoite fragmentation, mix with additive, sodium peroxide, fine grinding, make ball, the shaft furnace of packing into after the oven dry of gained raw material ball;
Step 2, transport portion Sweet natural gas and air mixed by ignite flammable carbon in the bone coal pelletizing of spark electrode, cause oxygen making reaction in the time of the heating shaft furnace;
Feed shaft furnace oxidizing roasting raw material ball in the lump as reaction gas after the top gas of step 3, circulation and the air mixed after the preheating;
Step 4, shaft furnace cooling section feed cold gas, the grog after the cooling roasting, and cooled grog is discharged by the dumping device of shaft furnace bottom, is used for the leaching of V2O5 through fragmentation;
The cold gas of step 5, shaft furnace cooling section through cooling dedusting, dehydration and pressurization, is returned the shaft furnace cooling section and is recycled after grog is cooled off;
The top gas that step 6, shaft furnace top are discharged is after dedusting, desulfurization, and a part is by the interchanger preheated air, and another part mixes with preheated air as reaction gas feeding shaft furnace and recycles.
2. a kind of bone coal navajoite furnace baking method according to claim 1, it is characterized in that, in the described step 1 bone coal navajoite is crushed to granularity less than 10 orders, mix with additive, sodium peroxide, fine grinding becomes granularity to account for raw material powder more than 80% less than 200 orders, the raw material ball diameter of making is 9-16mm.
3. a kind of bone coal navajoite furnace baking method according to claim 1 is characterized in that, additive is sodium salt, calcium salt or composite additive in the described step 1, and binding agent is the organic or inorganic binding agent.
4. a kind of bone coal navajoite furnace baking method according to claim 1 is characterized in that, oxygen making reaction is that the CO2 reaction that sodium peroxide and bone coal burning generate generates O2 in the described step 2.
5. a kind of bone coal navajoite furnace baking method according to claim 1 is characterized in that, air can be preheated to 150-250 ℃ in the described step 3, and mixing the back temperature with the top gas of circulation is 250-350 ℃.
6. a kind of bone coal navajoite furnace baking method according to claim 1 is characterized in that, raw material ball is in shaft furnace roasting 2-3 hour in the described step 3.
7. a kind of bone coal navajoite furnace baking method according to claim 1 is characterized in that, the grog cooling temperature is below 200 ℃ in the described step 4.
8. a kind of bone coal navajoite furnace baking method according to claim 1 is characterized in that, heated cold gas adopts the mist cooling cleaning apparatus in the described step 5.
9. a kind of bone coal navajoite furnace baking method according to claim 1 is characterized in that, top gas adopts high-temperature dust removing device and high temperature continuous desulfurization device in the described step 6.
10. the used system of bone coal navajoite furnace baking method according to claim 1, it is characterized in that, comprise shaft roasting device (1), cleaning apparatus (2), desulfurizer (3), interchanger (4), spray column (5), gas-liquid separator (6), compressor (7), described shaft roasting device (1) comprises feeding unit (11), shaft furnace body (12) and dumping device (13), wherein feeding unit (11) is connected with dumping device (13) with vertical body of heater (12) successively, the top gas export pipeline of described vertical body of heater (12) successively with cleaning apparatus (2), desulfurizer (3), interchanger (4) connects, described desulfurizer (3) successively with interchanger (4), vertical body of heater (12) is connected, the cold gas export pipeline of described vertical body of heater (12) successively with spray column (5), gas-liquid separator (6), compressor (7), the cold gas entrance pipe of vertical body of heater (12) is connected.
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| CN106399665A (en) * | 2016-10-21 | 2017-02-15 | 中钢集团鞍山热能研究院有限公司 | Inferior coal vanadium extraction pure oxygen roasting method and device |
| CN110453065A (en) * | 2019-09-12 | 2019-11-15 | 内蒙古工业大学 | The method of vanadium extraction in vanadium titano-magnetite, the leachate containing sodium vanadate extracted using this method and its application |
| CN115679094A (en) * | 2022-11-22 | 2023-02-03 | 东北大学 | Stone coal fluidized roasting leaching vanadium extraction system and vanadium extraction method thereof |
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