CN103276195B - 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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- 239000003245 coal Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000004575 stone Substances 0.000 title claims abstract description 17
- 229910052720 vanadium Inorganic materials 0.000 title abstract description 31
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 34
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 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
- 230000001590 oxidative effect Effects 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
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000000428 dust Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000005453 pelletization Methods 0.000 claims abstract description 8
- 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 3
- 238000001035 drying Methods 0.000 claims abstract 2
- 210000000988 bone and bone Anatomy 0.000 claims description 54
- 239000002994 raw material Substances 0.000 claims description 17
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 235000012054 meals Nutrition 0.000 claims description 6
- 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
- 238000002386 leaching Methods 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
- 239000000203 mixture Substances 0.000 claims description 4
- 239000003345 natural gas Substances 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 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 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000007599 discharging 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
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000001354 calcination Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000005261 decarburization 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
- 239000003610 charcoal Substances 0.000 description 3
- 238000005262 decarbonization Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 229910052742 iron Inorganic materials 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
- 150000001875 compounds Chemical class 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005516 engineering process Methods 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
- 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
- 238000012546 transfer Methods 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
- 229910021541 Vanadium(III) oxide Inorganic materials 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
- 238000009835 boiling 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
- 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
- 238000012423 maintenance 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
- 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
- 230000009466 transformation Effects 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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- Manufacture And Refinement Of Metals (AREA)
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, there is due to it performances such as very high tensile strength, hardness, fatigue resistance and good erosion resistance, be widely used in the industries such as iron and steel, nonferrous metallurgy and chemical industry, wherein more than 85% for Iron And Steel Industry.Along with Iron And Steel Industry is to excellent, smart, special future development, the application of high quality vanadium steel is by increasingly extensive, and the consumption of expert expects whole world vanadium is 10.4% in the compound annual growth rate of 2010-2015, and finally reach 11.5 ten thousand tons, vanadium industry development potentiality are very large.
In the world nearly 65 types containing vanadium minerals, 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, especially exists with the trivalent vanadium compound of the equal indissoluble of soda acid.At present, the method for the more employing raw ore of the method for extracting vanadium from stone coal (or the lime-ash after decarburization) roasting-leaching-vanadium liquid purification-precipitation calcining.Roasting is the committed step in extracting vanadium from stone coal process, and roasting effect directly affects V leaching rate, thus determines the vanadium total yield of whole technical process to a certain extent.
Bone coal roasting both can remove the carbon in bone coal, the vanadium of lower valency can be oxidized to high-valence state as far as possible, generate the vanadate of water soluble, acid or alkali with the reactive metal oxide in material again.In bone coal roasting process, affect factor mainly additive types and consumption, the roasting type of furnace, maturing temperature, roasting time, the calcination atmosphere etc. of roasting effect.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 industrial application, classify by additive, 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.; Classify by the type of furnace, flat kiln, shaft kiln, rotary kiln, tunnel furnace, multiple hearth furnace, fluidizing furnace, fluidized-bed etc. can be divided into, associated patent has: (1) high-conversion roasting shaft kiln for vanadium extraction from stone coal (CN202092446U), (2) a kind of rotary kiln for extracting vanadium from stone coal (N101762153A), (3) a kind of oxidation roasting furnace for vanadic oxide (CN201411379).Current bone coal sinter process, the shortcomings such as ubiquity vanadium low conversion rate, efficiency are low, contaminate environment.
Patent CN101857915A discloses a kind of pelletizing and calcination method of bone coal navajoite lime-ash, and described method comprises: in bone coal navajoite lime-ash, add NaCl that quality is bone coal navajoite lime-ash quality 1%-5%, CaF that quality is bone coal navajoite lime-ash quality 2%-7%
2with the CaCO that quality is bone coal navajoite lime-ash quality 10%-15%
3every kg mixture allocates hard coal or the bone coal of 1460-2100kJ into, mixing is finely ground to 80 order-150 orders and obtains raw meal powder, in raw meal powder, add the water that quality is raw material opaque amount 8%-20%, granulation balling-up after mechanical stirring, obtains the raw material ball of sphere diameter 3-15mm, feeding device through body of heater top loads body of heater, under the in-furnace temperature of 800-900 DEG C, complete roasting, the material after roasting is discharged through the dumping device of bottom of furnace body, obtains for V after cooling
2o
5the grog (usually with dilute hydrochloric acid or dilute sulphuric acid leaching) leached.The method heat utilization rate is high, constant product quality, production cost are low.
But apply this roasting method, the fuel such as the hard coal of interpolation leach V to follow-up from grog
2o
5unfavorable, the increase of acid consumption, solid-liquid separation difficulty can be caused; And the document does not produce heating installation and the type of heating of high temperature specifically in open oven; The hard coal added or bone coal can produce CO in combustion
2, CO
2the too high meeting of dividing potential drop causes the regeneration of CO, weakens shaft furnace internal oxidition atmosphere, is unfavorable for the oxidation of bone coal middle or low price vanadium.
Usual means about 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, turndown ratio are large, technology maturation, the length of easy manual control roasting time; Main drawback is low conversion rate, and equipment capacity is low, energy consumption is high, floor space is large, mechanization degree is low, and most of private vanadium extraction factory is pursuit fund benefit, by untreated waste gas directly to airborne release, does great damage to environment.Government department closes down this type of high energy consumption, high pollution, inefficient flat kiln production method just gradually.
The advantage of multiple hearth furnace can adjust the number of plies within the specific limits to reach the residence time of material in stove, by blasting air and extracting flue gas to control the maturing temperature of each layer, to provide the oxygen needed for bone coal roasting, flue gas to carry out waste heat recovery simultaneously.Shortcoming is that equipment capacity is low, investment is large.
Rotary kiln is replacing flat kiln in recent years gradually, becomes one of important vanadium extraction equipment of China.Advantage is that structure is simple, maintenance is easy, mechanization degree is high, equipment capacity is large, kiln internal oxidition atmosphere is good, utilize the rotation of kiln that material is constantly rolled, be conducive to roasting carry out, by adjustment kiln specification and operating parameters can control the residence time of furnace charge in kiln, flue gas can carry out waste heat recovery.Shortcoming: thermal zone too short, roasting material is short in the residence time of high-temperature zone, causes that energy utilization rate is low, investment is large, energy consumption is high, maturing temperature is difficult to control, and need carry out regulable control by pre-decarburization.
Bone coal has certain calorific value, and in theory, bone coal roasting does not need external heat source, but also the derivation of unnecessary heat will be gone, but rotary kiln is difficult to accomplish unnecessary heat to derive to go.In other words, be difficult to realize the control to required temperature with the bone coal raw ore that rotary kiln carrys out roasting 100%.Be adopted by part bone coal other mode (as: using Fludized boiling roasting) first to carry out de-charcoal in reality, after then being mixed by a certain percentage with the bone coal of not de-charcoal by the bone coal of de-charcoal, send into rotary kiln, to reach the effect of control temperature.
The advantage of fluidizing reactor is heat transfer and mass transfer effect is good, effectively can control maturing temperature, fully can reclaim again the heat that bone coal roasting produces, the maximum specific productivity being also advantageous in that it is large, fume afterheat can adopt waste heat boiler to reclaim.But fluidized bed roasting dust rate high (dust rate can reach 40%-50%), the residence time of flue dust in stove are extremely short, do not reach the time needed for roasting bone coal required by various new process for extracting vanadium from stone coal far away.
Marching type roasting kiln grows up on the basis of ceramic industry, the widely used tunnel furnace of making coal gangue brick industry, is used to the roasting containing vanadium raw materials in recent years, can be divided into preheating zone, roast area and cooling zone in kiln.Strong points such as these kiln furnitures have maturing temperature, time, atmosphere easy to control, but require bulk level land, construction investment is comparatively large, and energy consumption is high and need adopt the high-grade fuel such as Sweet natural gas or coal gas, and stack bricks full operation by hand in addition, and labour intensity is larger.
Flat kiln is backward in technique, belongs to industry restructuring superseded or restricted; Fluidizing reactor is subject to the too high and flue dust of dust rate in the short constraint of residing time in furnace; Not yet inquire the example that multiple hearth furnace is applied to bone coal roasting, mainly the specific productivity of multiple hearth furnace low and investment do not put into practice greatly and; To difficult control of temperature when the problem of rotary kiln is roasting; The investment of marching type roasting kiln is large, energy consumption is high, hinders industrial application.Affect extracting vanadium from stone coal enterprise to maximize industrial reason, mainly whether suitable the selection of roasting apparatus is, also relates to the further improvement of sinter process simultaneously.The selection of roasting apparatus needs according to bone coal feature, considers, preferably adopts energy-conserving and environment-protective, is convenient to control, oxidation efficiency is high, takes up an area less, the combustion equipment of less investment in conjunction with local conditions, and shaft furnace meets above requirement.
Summary of the invention
The object of the invention is to solve problems of the prior art, a kind of bone coal navajoite high-efficient roasting method and system, particularly a kind of bone coal navajoite furnace baking method and system are provided.
The object of the invention is to be achieved through the following technical solutions:
A kind of bone coal navajoite furnace baking method, comprising:
Step 1, bone coal navajoite is broken, mix with additive, sodium peroxide, fine grinding, pelletizing, load shaft furnace after the oven dry of gained raw material ball;
Step 2, transport portion Sweet natural gas and air mixed, the flammable carbon ignited by spark electrode in bone coal pelletizing, causes oxygen making reaction while heating shaft furnace;
Shaft furnace oxidizing roasting raw material ball is passed in the lump as reaction gas after air mixed after step 3, the top gas circulated and preheating;
Step 4, shaft furnace cooling section pass into cold gas, the grog after cooling roasting, and cooled grog is discharged by the dumping device bottom shaft furnace, is used for V through fragmentation
2o
5leaching;
The cold gas of step 5, shaft furnace cooling section, by after clinker cooling, through cooling dedusting, dehydration and pressurization, returns shaft furnace cooling section and recycles;
The top gas that step 6, shaft furnace top are discharged is after dedusting, desulfurization, and a part is by interchanger preheated air, and another part mixes with preheated air and passes into shaft furnace as reaction gas and recycle.
In described step 1, bone coal navajoite is crushed to granularity and is less than 10 orders, mix with additive, sodium peroxide, be finely ground into granularity and be less than the raw meal powder that 200 orders account for more than 80%, the raw material ball diameter made is 9-16mm.
In described step 1, additive is sodium salt, calcium salt or composite additive, and binding agent is organic or inorganic binding agent.
In described step 2, oxygen making reaction is the CO that sodium peroxide and stone coal combustion generate
2reaction generates O
2, not only increase oxygen concentration in shaft furnace, consume part CO in shaft furnace simultaneously
2, decrease the load of follow-up decarbonization process.
In described step 3, air can be preheated to 150-250 DEG C, and after mixing with the top gas of circulation, temperature is 250-350 DEG C.
Raw material ball roasting 2-3 hour in shaft furnace in described step 3.
In described step 4, clinker cooling temperature is less than 200 DEG C.
Mist cooling cleaning apparatus is adopted by the cold gas heated in described step 5.
In described step 6, top gas adopts high-temperature dust removing device and high temperature continuous desulphurizing device.
The system that bone coal navajoite furnace baking method according to claim 1 is used, is characterized in that, comprises 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 vertical furnace (12) and dumping device (13) successively, the top gas export pipeline of described vertical furnace (12) successively with cleaning apparatus (2), desulfurizer (3), interchanger (4) connect, described desulfurizer (3) successively with interchanger (4), vertical furnace (12) is connected, the cold gas export pipeline of described vertical furnace (12) successively with spray column (5), gas-liquid separator (6), compressor (7), the cold gas entrance pipe of vertical furnace (12) is connected.
Apply beneficial effect of the present invention:
(1) oxidation efficiency is high:
A) CO that generates of sodium peroxide and stone coal combustion
2reaction generates O
2, not only increase oxygen concentration in shaft furnace, consume part CO in shaft furnace simultaneously
2, decrease the load of follow-up decarbonization process;
B) adopt shaft furnace oxidizing roasting bone coal navajoite, raw material ball and oxygen move counter-current in stove moves, and not only increases exchange and the utilization of heat, and extends the oxidation time of Low Valent Vanadium, improve the transformation efficiency of vanadium;
(2) energy-conservation: the heating unit first not needing oxidative reaction gas, greatly reduces energy consumption; Secondly Efficient Cycle make use of the heat of top gas, improves heat utilization rate (top gas after purification a, part is for decarburization emptying after preheated air, and the air mixed of another part directly and after preheating is as reaction gas);
(3) environmental protection: top gas, through dedusting and desulfurization, reduces dust and sulfurous gas pollution on the environment;
(4) throughput is high: the unit volume productivity of shaft furnace is large;
(5) condition is easily controlled: the processing parameter such as calcination atmosphere, temperature and time easily controls, and the suitability of technique is wide.
Accompanying drawing explanation
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 the present invention being described, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present 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 mixing and be less than the raw meal powder that 200 orders account for more than 85%, water and binding agent is added in raw meal powder, after mixing in balling head pelletizing, obtain the raw material ball of sphere diameter 9-16mm;
(2), after described raw material ball is dried at 120 DEG C, the feeding unit through shaft furnace top loads body of heater, moves from top to bottom;
(3) transport portion Sweet natural gas and air mixed, the flammable carbon ignited by spark electrode in bone coal pelletizing, cause oxygen making reaction while heating shaft furnace, perpendicular in-furnace temperature controls at 800-850 DEG C, and oxygen level is 35%-40%;
(4) after the air mixed after the top gas circulated and preheating, temperature is 250 DEG C-300 DEG C, passes into shaft furnace oxidizing roasting raw material ball in the lump as reaction gas;
(5) reaction gas enters shaft furnace, flows from below to up in shaft furnace, the raw material ball 2h of oxidizing roasting inverse motion;
(6) roasting complete after grog, through shaft furnace bottom, cooling section is cooled to less than 200 DEG C, is discharged, for V after fragmentation by bottom discharge device
2o
5leaching;
(7) cold gas of shaft furnace bottom cooling section is by after clinker cooling, successively through spray column, gas-liquid separator and compressor, again returns shaft furnace cooling section and recycles;
(8) top gas is after the purification of cleaning apparatus, desulfurizer, and a part is by decarburization emptying after interchanger preheated air, and another part directly mixes with the air after preheating and passes into shaft furnace as reaction gas.
The present invention compared with prior art, does not first need external heat source, greatly reduces energy consumption; The CO that next sodium peroxide and stone coal combustion generate
2reaction generates O
2, not only enhance oxidizing atmosphere, and consume part CO in shaft furnace
2, decrease the load of follow-up decarbonization process; Last Efficient Cycle make use of the heat of top gas, improves heat utilization rate.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change 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 (9)
1. a bone coal navajoite furnace baking method, is characterized in that, comprising:
Step 1, bone coal navajoite be crushed to granularity be less than 10 orders, mix with additive, sodium peroxide, fine grinding, pelletizing, gained raw material ball loads shaft furnace after drying;
Step 2, transport portion Sweet natural gas and air mixed, the flammable carbon ignited by spark electrode in bone coal pelletizing, causes oxygen making reaction while heating shaft furnace;
Shaft furnace oxidizing roasting raw material ball is passed in the lump as reaction gas after air mixed after step 3, the top gas circulated and preheating;
Step 4, shaft furnace cooling section pass into cold gas, the grog after cooling roasting, and the rear temperature of cooling is that the grog of less than 200 DEG C is discharged by the dumping device bottom shaft furnace, is used for V through fragmentation
2o
5leaching;
The cold gas of step 5, shaft furnace cooling section, by after clinker cooling, through cooling dedusting, dehydration and pressurization, returns shaft furnace cooling section and recycles;
The top gas that step 6, shaft furnace top are discharged is after dedusting, desulfurization, and a part is by interchanger preheated air, and another part mixes with preheated air and passes into shaft furnace as reaction gas and recycle.
2. a kind of bone coal navajoite furnace baking method according to claim 1, it is characterized in that, be less than mixing, be finely ground into granularity after bone coal navajoite fragmentation with additive, sodium peroxide the raw meal powder that 200 orders account for more than 80% in described step 1, the raw material ball diameter made is 9-16mm.
3. a kind of bone coal navajoite furnace baking method according to claim 1, is characterized in that, in described step 1, additive is sodium salt, calcium salt or composite additive, and binding agent is organic or inorganic binding agent.
4. a kind of bone coal navajoite furnace baking method according to claim 1, is characterized in that, in described step 2, oxygen making reaction is the CO that sodium peroxide and stone coal combustion generate
2reaction generates O
2.
5. a kind of bone coal navajoite furnace baking method according to claim 1, it is characterized in that, in described step 3, air can be preheated to 150-250 DEG C, and after mixing with the top gas of circulation, temperature is 250-350 DEG C.
6. a kind of bone coal navajoite furnace baking method according to claim 1, is characterized in that, raw material ball roasting 2-3 hour in shaft furnace in described step 3.
7. a kind of bone coal navajoite furnace baking method according to claim 1, is characterized in that, is adopted mist cooling cleaning apparatus in described step 5 by the cold gas heated.
8. a kind of bone coal navajoite furnace baking method according to claim 1, is characterized in that, in described step 6, top gas adopts high-temperature dust removing device and high temperature continuous desulphurizing device.
9. the system that bone coal navajoite furnace baking method according to claim 1 is used, is characterized in that, comprises 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 shaft furnace body (12) and dumping device (13) successively, the top gas export pipeline of described shaft furnace body (12) successively with cleaning apparatus (2), desulfurizer (3), interchanger (4) connect, described desulfurizer (3) successively with interchanger (4), shaft furnace body (12) is connected, the cold gas export pipeline of described shaft furnace body (12) successively with spray column (5), gas-liquid separator (6), compressor (7), the cold gas entrance pipe of shaft furnace body (12) is connected.
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| CN105695732A (en) * | 2016-03-01 | 2016-06-22 | 攀钢集团攀枝花钢钒有限公司 | Fine vanadium slag pelleting and roasting method and production system thereof |
| CN105838903B (en) * | 2016-04-01 | 2017-12-15 | 北京工业大学 | A kind of method that high grade copper oxide concentrate is prepared based on self-propagating reaction processing copper sulfide concentrate |
| CN106399665B (en) * | 2016-10-21 | 2018-04-06 | 中钢集团鞍山热能研究院有限公司 | A kind of method and device of low-grade coal vanadium extraction pure oxygen roasting |
| CN110453065B (en) * | 2019-09-12 | 2020-12-15 | 内蒙古工业大学 | Method for extracting vanadium from vanadium-titanium magnetite, leaching solution containing sodium vanadate extracted by method and application of leaching solution |
| 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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