CN100564551C - Heat recovering and microwave reducing manganesian ore roasting process and equipment - Google Patents
Heat recovering and microwave reducing manganesian ore roasting process and equipment Download PDFInfo
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Abstract
A kind of heat recovering and microwave reducing manganesian ore roasting process, with microwave oven carry out the reducing roasting of manganese oxide ore, with hot air circulation technology recovery waste heat; Its processing parameter is: the weight ratio of going back raw coal and manganese oxide powder is 15%-18%, raw material mineral powder granular degree-100 order 〉=85%, 380 ℃-450 ℃ of reducing roasting temperature, reducing roasting reaction times 〉=5 minute, material final outlet temperature≤80 ℃.Used processing unit is that microwave oven reaches preheating storehouse above it, the cooling storehouse of below, has heating duct to connect between preheating storehouse and cooling storehouse.Use sinter process of the present invention and equipment, can obtain following technical indicator: reduction ratio: 〉=92%, coal consumption :≤180kg/ ton ore deposit, microwave energy consumption: 210-240kw.h during the normal temperature charging; Charging in the time of 200 ℃ when adopting heat recovery technology, microwave energy consumption≤110kw.h/ ton ore deposit; System device total energy consumption :≤140kw.h/ ton ore deposit.
Description
Technical field
The present invention relates to the technology and the apparatus field that adopt microwave technology to come reducing roasting manganese oxide ore and recovery waste heat.
Background technology
The reducing roasting of manganese oxide ore is an important step in the manganese ore deep processing technology, and the reducing roasting equipment that adopts in present industrial production mainly contains reverberatory furnace, shaft furnace, rotary kiln, fluidized roaster etc.In the above-mentioned stove and accessory, reverberatory furnace hear rate height, production efficiency is low, labor condition is abominable, environmental pollution is serious, and the new industry standard of China has been prohibited use; The mineral granularity scope that shaft furnace adapts to is little, the ore ventilation property is poor, reduction effect is undesirable; In rotary kiln energy consumption height, heating member (nichrome wire) work-ing life short, the stove iron-clad zone of oxidation often have come off, the stove and accessory loss is big and pollute more serious to ore; Fluidized roaster hear rate height, flue dust are big, support equipment is complicated.Therefore, energy-saving and cost-reducing, the clean environment firendly of research and development, manganese oxide reducing roasting technology and equipment that labour intensity is low have become one of scientific research emphasis of industry.
In recent years, Jilin University, Kunming University of Science and Technology have carried out more deep research to microwave technology in the application of metallurgy industry.According to " microwave promotes MnO
2The kinetics of decomposing " (China YouSe Acta Metallurgica Sinica, 1998.9) report: the applied microwave technology is to MnO
2(chemical pure level, 98.5%) carries out thermal degradation can obtain good result.
MnO
2Thermal degradation be proceed step by step, promptly
MnO
2→Mn
2O
3→Mn
3O
4
Wherein, at MnO
2→ Mn
2O
3Link, the microwave heating rate of decomposition has improved 2.18～16.71 times than traditional heating, at Mn
2O
3→ Mn
3O
4Link, the microwave heating rate of decomposition has improved 1.85～78.86 times than traditional heating.Simultaneously, utilize microwave that manganese ore is carried out thermal degradation, can also carry out under lower temperature: the speed of reaction during microwave heating to 347 ℃ when ore reduction speed of reaction and traditional heating to 900 ℃ equates; When traditional heating to 1000 ℃, the speed of reaction the when rate of decomposition of ore and microwave heating to 437 ℃ equates; Under same speed, the required temperature of reaction temperature of reaction more required than traditional heating of microwave heating differs 553 ℃～563 ℃, replaces traditional heating that the energy consumption of reaction process is significantly reduced with microwave heating.
But above research is only mentioned from MnO
2→ Mn
3O
4Link, and only under breadboard perfect condition (chemical pure level) carry out; And to realize adopting microwave technology from ore directly with MnO
2Reduction obtains MnO, also has following problem:
1. the manganese oxide content of manganese oxide ore generally has only 35%-50%, and is low-grade even have only 30%; Its physics and chemistry state and pure MnO
2Very big difference is arranged, and pyrolysis and reduction difference are also very big.Manganese oxide ore whether go back reduction ratio that parameters such as raw coal proportioning, granularity, reducing roasting temperature, time all can directly have influence on manganese oxide ore in the actual production, coking, cost height etc.
2. follow-up cooling cooling and the UTILIZATION OF VESIDUAL HEAT IN problem after the reducing roasting: the manganese oxide ore after the reducing roasting needs could guarantee under the certain temperature not by oxidation again being cooled under the prerequisite of secluding air.Practice shows, though the reducing roasting of manganese oxide can be carried out at a lower temperature, equally also may reoxidize at a lower temperature.In the laboratory, can water after the roasting directly water to drench and force cooling, but in suitability for industrialized production because of the requirement of subsequent technique and operability, can not take water directly to water pouring, must study rational follow-up forced cooling refrigerative method, and make full use of waste heat, reduce thermosteresis.
Suitability for industrialized production require the reducing roasting of manganese oxide ore can be continuously, equilibrium and treatment capacity be big; But general microwave device can not satisfy these requirements fully, must the suitable microwave heating installation of design.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of production capacity height, quality is good and can significantly cut down the consumption of energy heat recovering and microwave reducing manganesian ore roasting process and equipment.
The present invention solves the problems of the technologies described above with following technical scheme:
The processing parameter that the present invention adopts is as follows:
(1). the weight ratio of going back raw coal and manganese oxide powder is 15%-18%;
(2). raw material mineral powder granular degree-100 order 〉=85%;
(3). 380 ℃-450 ℃ of reducing roasting temperature;
(4). reducing roasting reaction times 〉=5 minute;
(5). material final outlet temperature≤80 ℃.
The technological process of manganese oxide ore microwave reducing roasting is: qualified coal dust and manganese ore powder enter the fender storehouse after entering the mixer stirring and evenly mixing by the design proportioning, enter the preheating storehouse from charging star valve again, in the preheating storehouse, fall, being higher than 350 ℃, up high-temperature hot-air with the temperature of being sent by the cycling hot blower fan, send here through heating duct drives in the wrong direction and meets, in the move toward one another process, finish heat exchange, continue behind the pit coal powder pre-heating temperature elevation, hot gas flow turns back to the cooling storehouse by cycling hot blower fan and hot air duct after then being cooled to the temperature of design; Hot pit coal powder continues to fall to entering microwave oven to carry out reducing roasting; High temperature pit coal powder after reducing roasting is qualified is sent, is entered the cooling storehouse through the material pipe by discharging star valve, in the cooling storehouse, fall from top to bottom, the circulation cold air of being brought by hot air duct by the cycling hot blower fan flows in the storehouse from bottom to top, both finish heat exchange in the inverse motion process, reach material cooling cooling purpose; Material was cooled to below 80 ℃ and entered the back operation by isolating the star valve after insulation for some time, and air-flow turns back to the preheating storehouse by the cycling hot blower fan and constantly circulates being warmed to more than 350 ℃ the back.
Use heat recovering and microwave reducing manganesian ore roasting process of the present invention and equipment, can obtain following production and technical indication: reduction ratio: 〉=92%, coal consumption :≤180kg/ ton ore deposit, microwave energy consumption during the normal temperature charging: 210-240kw.h/ ton ore deposit; Adopt heat recovery technology in the time of 200 ℃ during charging, microwave energy consumption≤110kw.h/ ton ore deposit; System device total energy consumption :≤140kw.h/ ton ore deposit.Technology of the present invention has made full use of waste heat, has significantly reduced energy consumption; Realized that production capacity is big, serialization production, and reach cleaningization production, stopped the generation of flue dust.
Description of drawings
Fig. 1 is the FB(flow block) of heat recovering and microwave reducing manganesian ore roasting process of the present invention and equipment;
Fig. 2 is the structural representation of heat recovering and microwave reducing manganesian ore roasting process equipment used of the present invention;
Fig. 3 is the structural representation in the cooling storehouse in the equipment shown in Figure 2;
Fig. 4 is the structural representation of the microwave heating equipment in the equipment shown in Figure 2.
Embodiment
In research heat recovering and microwave reducing manganesian ore roasting process of the present invention, the subject matter that solves is that operational path, processing parameter, the equipment of manganese oxide ore microwave reducing roasting disposes, the follow-up forced cooling method of reducing roasting reaches how to utilize waste heat, and the structure formation of microwave heating installation and core parameter.
The processing parameter of manganese oxide ore microwave reducing roasting of the present invention is as follows:
(1). the proportioning of going back raw coal and manganese oxide powder is 15%-18% (a weight % ratio, as follows);
(2). raw material mineral powder granular degree-100 order is more than 85%, but unsuitable meticulous, control minimum particle size-325 order is below 1%;
(3). 380 ℃-450 ℃ of reducing roasting temperature;
(4). the reducing roasting reaction times was not less than 5 minutes;
(5). material final outlet (promptly isolating star valve 14 places) temperature≤80 ℃.
Implement specific equipment structure of the present invention: preheating storehouse 4 is arranged above microwave oven 5, and there is cooling storehouse 7 below.Between top, preheating storehouse and the cooling bottom, storehouse, be connected with heating duct 12 with heating duct 11 respectively between bottom, preheating storehouse and the cooling top, storehouse.
All there are many spreader plates 17 at the middle part on preheating storehouse and cooling storehouse inner chamber, and star valve 6, star valve 14 are arranged respectively at cooling top, storehouse and bottom, and there are inlet mouth 22, air outlet 23 in the side; Top, preheating storehouse has star valve 3, two storehouse rest part structures identical.
The basic craft course of microwave reducing roasting is as follows:
Qualified coal dust and manganese ore powder enter fender storehouse 2 after entering mixer 1 stirring and evenly mixing by the design proportioning, enter preheating storehouse 4 from charging star valve 3 again, the hollow arrow direction of pressing in preheating storehouse 4 among Fig. 2 falls, with send by cycling hot blower fan 8, the temperature of sending here through heating duct 12 is higher than 350 ℃, by retrograde the meeting of the up high-temperature hot-air of filled arrows direction among Fig. 2, in the move toward one another process, finish heat exchange, continue behind the pit coal powder pre-heating temperature elevation to fall, temperature (the about 50 ℃) back that hot gas flow is then cooled to design turns back to cooling storehouse 7 by cycling hot blower fan 9 and hot air duct 11; Hot pit coal powder continues to fall to entering microwave oven 5 to carry out reducing roasting; High temperature pit coal powder after reducing roasting is qualified is sent, is entered cooling storehouse 7 through material pipe 15 by discharging star valve 6, in cooling storehouse 7, fall from top to bottom, the circulation cold air of being brought by hot air duct 11 by cycling hot blower fan 9 flows in the storehouse from bottom to top, both finish heat exchange in the inverse motion process, reach material cooling cooling purpose; Material was cooled to below 80 ℃ and entered the back operation by isolating star valve 14 after insulation for some time, and air-flow turns back to preheating storehouse 4 by cycling hot blower fan 8 and constantly circulates being warmed to more than 350 ℃ the back.
According to manganese oxide reductive total reaction chemical equation 2MnO
2+ C=2MnO+CO
2↑ as can be known, CO is arranged constantly in reducing roasting process
2Gas produces, and system is in barotropic state; If system is airtight fully, then its internal pressure can be more and more higher; For keeping the normal operation of system, can on the recirculating air pipeline, establish an one-way pressure relief valve 10, keep the pressure of system to be in slight positive pressure state constantly.
Because system constantly has water vapor to produce, untimely discharge can influence the operation of system; The discharge of steam is discharged during mainly from one-way pressure relief valve 10 exhaust releases, discharges from wash water valve 13 behind condensation and dewfall on the airduct on a small quantity again.
In the cooling storehouse, when the high temperature pit coal powder after the reducing roasting enters the material guide port in cooling storehouse, falling velocity is progressively quickened, suffered gas-flow resistance also progressively increases, when resistance equates with gravity, the speed of relative movement of material particles and air-flow reaches constant, and the speed of this moment is the particulate free falling velocity; Stokes (Stokes) formula according to particle sinking speed
Wherein: u
t-particulate free falling velocity, m/s;
The d-particle diameter, m;
ρ
s, ρ-be respectively particle and fluidic density, kg/m
3
G--universal gravity constant, m/s
2
μ-fluidic viscosity, Pa.s
The substitution related data can calculate when smallest particles d=44 * 10
-6Free falling velocity u during mm (325 order)
t=0.17m/s;
In the material dropping process in the cooling storehouse, because the shunting action of spreader plate 17 in the storehouse, the abundant disperseization of pit coal pruinescence is also slowly fallen at the bottom of the storehouse; Form the certain thickness bed of material 20 in the bottom, storehouse.About 50 ℃ cold air stream through spray tube 21 again the bed of material from nozzle 18 towards the bottom spray at a high speed, on the bed of material, form the very thin suspended layer 19 of one deck, form the jet heat exchange; After the gas ejection, because open area becomes big, air-flow is slowed down rapidly.The sectional dimension that cooling middle and upper part, storehouse is divided should be designed so that gas velocity drops to≤0.1m/s; Because the speed of air-flow is lower than the free falling velocity (0.17m/s) of material smallest particles, so material can not produce the airborne dust problem; Because the existence of spreader plate and inverted draft, the falling velocity of pit coal powder is also very low.The height that cooling middle and upper part, storehouse is divided should be designed to guarantee that material and air-flow have the sufficient time heat exchange in the process of inverse motion, and material is progressively lowered the temperature, and air-flow progressively heats up, and forms convective heat exchange.Two kinds of heat exchange modes are auxilliary based on convective heat exchange, jet heat exchange.Final pit coal pruinescence cools to the temperature (≤80 ℃) of design and enters the back operation from isolating 14 discharges of star valve.And the air-flow screen plate 16 of flowing through after being heated is aggregated into airflow chamber 24, sends from air stream outlet 23 at last, enters the preheating storehouse again and is used for cold pit coal powder of preheating and constantly circulation.
The heat transfer process in preheating storehouse is identical with the heat exchange in cooling storehouse.
For adapting to the requirement of continuous production, balanced heating, microwave oven is done following design:
(1) microwave oven structure form: for adapting to the successional requirement of suitability for industrialized production, manganese oxide microwave reducing roasting stove is the gravity type boat davit shaft furnace structure shown in figure four, burner hearth 26 vertical sections are refractory wall 25 for perpendicular rectangular parallelepiped around it, and microwave generating unit 27 is evenly distributed on around the refractory wall; Manganese oxide powder advances from upper furnace, and the bottom goes out, when the burner hearth by the microwave heating reducing roasting, by discharging star valve 6 rotating speeds of controlled microwave stove bottom, the i.e. residence time of may command pit coal powder in burner hearth.
(2) size of burner hearth of manganese oxide reducing roasting microwave oven:
Theoretical and experimental results show that: manganese oxide can absorb microwave consumingly, because energy constantly is absorbed and is converted into heat energy, the entrained energy of microwave is decayed with exponential form just along with the distance of going deep into dielectric surface; So microwave has certain penetration depth for manganese oxide powder; The depth of microwave penetration (the material internal power density is the 1/e or 36.8% depth D of counting of surface energy density) of general manganese oxide powder is about about 120mm; For the burner hearth of gravity type boat davit shaft furnace structure, " cold core " phenomenon does not appear as guaranteeing the material in the burner hearth, and just require the microwave energy power density of burner hearth central position to be necessary for 100%; Because of the microwave generating unit is evenly distributed on around the burner hearth, so then be 50% for one-sided microwave energy power density; Because micro-wave energy decays with exponential form, thus the burner hearth central point to Edge Distance L=120 * ln 0.5/ln (1/e)=83mm, then the width of burner hearth or diameter must be less than 2 * 83=166mm.
Below enumerate the embodiment that comes the reducing roasting manganese oxide ore with microwave technology:
Embodiment 1:
One. confirmatory experiment
1. experiment purpose: further check microwave equipment that the manganese ore powder is carried out the degree that the industrialization reducing roasting can realize, inquire into reaction conditions, the major influence factors of microwave reducing roasting.
2. laboratory apparatus and experimental subjects
A. instrument: experiment is with industrial microwave baking furnace (10kw), precise electronic balance, counter, hand-held high precision infrared thermometer (0 ℃～500 ℃ of ranges), the online high precision infrared thermometer of Prussian's board (0 ℃～900 ℃ of ranges), corundum-mullite burner hearth (225mm * 145mm * 145mm) aluminum oxide insulating cotton, sample sealed can.
B. raw material: the pulverized anthracite that the metallurgical breeze of the big new manganese ore in Guangxi, the big new manganese ore production in Guangxi are used.
3. roasting reduction processing parameter:
The experiment condition of setting is: maturing temperature is respectively 420 ℃, 400 ℃, 380 ℃; Soaking time is respectively 15min, 20min, 30min.The colliery ratio is respectively 5%, 10%, 15% (increase by 18%, 20% and do to enlarge experiment).Determine one by one that according to above result reaction conditions carries out orthogonal experiment at last, find out the optimal conditions combination.
4. experimental procedure
Each roasted ore amount 4kg carries out coal blending by the colliery than 5%, 10%, 15%, 18%, 20%, puts into experiment industrial microwave oven roasting behind the mixing.Take out to add a cover after burning till and naturally cool to room temperature, sampling analysis.
5. experimental result:
Experimental result shows, the colliery is than being the key factor that influences transformation efficiency, and under the identical situation of maturing temperature, soaking time, 15% colliery proportioning transformation efficiency is all than 10%, 5% height.Material had caking phenomenon when coal blending was not enough, and the colliery ratio is brought up to 18% o'clock material does not have caking, and transformation efficiency also obviously improves.And temperature is little to the transformation efficiency influence during at 20～40min at 380 ℃～420 ℃, soaking time.After roasting finished, material naturally cooled to room temperature in burner hearth, and this moment, the sampling analysis transformation efficiency was not high, and tracing it to its cause mainly is roasting material severe oxidation again in process of cooling.Peak rate of conversion is 93.57% in the experiment, and minimum transformation efficiency is 54.34%.
6. conclusion
Testing optimum roasting condition is: 380 ℃ of temperature of reaction, soaking time 30min, colliery are than 18%.Carry out the roasting of manganese ore powder in the above conditions, can obtain satisfied transformation efficiency.Experiment calculates that the reduction power consumption is 208 degree/tons, and treatment capacity is 5.76kg/ degree electricity h.
Embodiment 2
Roasting apparatus is a HWS-18 type rotary type microwave oven.
Experimental technique is: cooling → sample preparation analysis is forced in weighing → spice mixing → charging roasting → sampling
Experimentation: raw material is divided into 17 parts of samples, and every part is respectively 10 or 20 kilograms, and the colliery ratio is respectively 14% or 18%.Under the essentially identical condition of other processing parameters, microwave needs material to account for the total power consumption average out to 33% of roasting at this temperature section power consumption about power consumption 100 degree when normal temperature is heated to 150 ℃; To account for the mean value of the total power consumption of roasting respectively be 53%, 68% and 80% to each temperature section power consumption when being heated to 200 ℃, 250 ℃, 300 ℃.Estimation is carried out roasting reduction with microwave to the manganese ore powder on the whole, and ore deposit roughly per ton needs power consumption 210 degree～240 degree, and its end value and initial water content are closely related.Reduction ratio is up to 99.32%, and minimum is 67.68%, and reduction ratio is accounting for 70.1% of normal operating condition total number of samples more than 92%.
Experiment conclusion
1, adopts microwave heating that manganese ore powder or ore in sand form are carried out reducing roasting, the manganese ore powder is heated to the strong cold reduction ratio that obtains about 95% after 400 ℃;
2, roasting postcooling mode is bigger to the reduction ratio influence, and the rapid sealing cooling is much higher than the reduction ratio of naturally cooling.
3, soaking time and heat preserving mode are not remarkable to the reduction ratio influence.
4, particulate material also can realize reducing roasting, but granularity is unsuitable excessive, otherwise reduction ratio is had very big influence.
Embodiment 3
Be interim test.
Stoving oven is the shaft furnace of continuous feeding and discharging.Because of condition is limit, adopt and manually mix, feed intake and the discharging of star valve machinery, no Forced water cooling device.
The wide 150mm of stoving oven burner hearth, volume 0.176m
3Total 189 microwave units of microwave generator 8 batch totals because of the service voltage deficiency, can only be opened 3 groups of microwave devices during experiment, reality uses power to be 48KW.
Experimental raw is metallurgical manganese powder of big new manganese ore and pulverized anthracite.
Experimentation:
Experiment one: metallurgical manganese powder 500kg, pulverized anthracite 50kg; Drop into roasting in the stoving oven behind the mixing, roasting finishes after the discharging of star discharging machine, and chemical examination is sent in sample preparation behind the sampling naturally cooling.
Experiment two, three, four: metallurgical manganese powder 500kg, pulverized anthracite 90kg; Chemical examination is sent in sample preparation after the sampling sealed external water-cooled; Other steps are with experiment one.
Result such as following table:
Metallurgical manganese powder microwave calcining experimental data table
| Phenomenon | Remarks | |
| Experiment one | Material has the material spray phenomenon when mobile in stove, discharging found that material has sintering phenomenon, normally discharging in the stove after roasting was finished.Treat to take discharging machine apart after furnace temperature is reduced to room temperature, disclose in the blow-on with drill rod and lump, find to lump the position in the middle of material, do not find material and furnace wall bonding (freezing of a furnace).The material color is black. | 1, coal compared lowly, and the high-temperature gas that (lab scale confirms) 2, roasting reaction produces is carried material secretly and sprayed from dog-house when material moves.3, because of naturally cooling, high-temperature material reoxidizes seriously, and the manganese reduction ratio has just reached 25%. |
| Experiment two experiments three experiments four | Material has the material spray phenomenon when mobile in stove, discharging found that material does not have sintering phenomenon after roasting was finished, material moves smooth and easy in stove, the star discharging machine is because of directly the distortion of contact high-temperature material is stuck midway, up to 300 ℃ (infrared thermometries), back sample preparation chemical examination is cooled off in sampling sealing in time without the cooling material surface temperature, and the manganese reduction ratio respectively is: 92.27%, 90.86%, 93.83%. | 1, carries high-coal ratio and after the lab scale index, do not have sintering phenomenon.2, because of there not being pre-cooled device, discharging machine has certain distortion stuck, normally discharging. |
Middle experiment microwave calcining basic technical indicator:
1, initial temperature: normal temperature
2, critical temperature: 380 ℃
3, top temperature: 480 ℃
4, roasting total time: 90 minutes
5, current consumption: 95KWh/500Kg ore deposit
6, pit coal was than 100: 18
7, material spray degree: material has the material spray phenomenon when mobile in stove
8, sintering degree: no sintering phenomenon, material can smooth and easyly move in stove
9, without the refrigerative temperature of charge: 300 ℃ (surface temperature)
10, reduction ratio: 92.32% (on average)
Claims (2)
1. a heat recovering and microwave reducing manganesian ore roasting process is characterized in that microwave oven is used for the reducing roasting of manganese oxide ore, adopts hot air circulation technology recovery waste heat, and processing parameter is as follows:
(1). the weight ratio of going back raw coal and manganese oxide powder is 15%-18%;
(2). raw material mineral powder granular degree-100 order 〉=85%;
(3). 380 ℃-450 ℃ of reducing roasting temperature;
(4). reducing roasting reaction times 〉=5 minute;
(5). material final outlet temperature≤80 ℃.
2. heat recovering and microwave reducing manganesian ore roasting process as claimed in claim 1, it is characterized in that reducing roasting process is: qualified coal dust and manganese ore powder enter the fender storehouse after entering the mixer stirring and evenly mixing by the design proportioning, enter the preheating storehouse from charging star valve again, in the preheating storehouse, fall, with send by the cycling hot blower fan, the temperature of sending here through heating duct is higher than 350 ℃, up high-temperature hot-air drives in the wrong direction and meets, in the move toward one another process, finish heat exchange, continue behind the pit coal powder pre-heating temperature elevation, hot gas flow turns back to the cooling storehouse by cycling hot blower fan and hot air duct after then being cooled to the temperature of design; Hot pit coal powder continues to fall to entering microwave oven to carry out reducing roasting; High temperature pit coal powder after reducing roasting is qualified is sent, is entered the cooling storehouse through the material pipe by discharging star valve, in the cooling storehouse, fall from top to bottom, the circulation cold air of being brought by hot air duct by the cycling hot blower fan flows in the storehouse from bottom to top, both finish heat exchange in the inverse motion process, reach material cooling cooling purpose; Material was cooled to below 80 ℃ and entered the back operation by isolating the star valve after insulation for some time, and air-flow turns back to the preheating storehouse by the cycling hot blower fan and constantly circulates being warmed to more than 350 ℃ the back.
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| CN102605175A (en) * | 2012-02-24 | 2012-07-25 | 湖南阳东微波科技有限公司 | Technological process for producing manganese oxide mineral powder using industrial microwave furnace |
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| BRPI0804694B1 (en) * | 2008-07-25 | 2018-11-21 | Vale Do Rio Doce Co | Manganese pellet production process from non-calcined manganese ore and manganese pellet obtained by such process |
| CN103468931B (en) * | 2013-08-20 | 2016-05-11 | 中信大锰矿业有限责任公司大新锰矿分公司 | A kind of microwave calcining equipment |
| CN105783503B (en) * | 2016-04-29 | 2018-07-10 | 青岛智邦炉窑设计研究有限公司 | A kind of industrial microwave reduction roasting device and technique |
| CN107400775B (en) * | 2016-05-20 | 2019-07-02 | 云南民族大学 | A kind of method of microwave heating biomass reduction pyrolusite |
| CN106304457A (en) * | 2016-09-09 | 2017-01-04 | 武汉科技大学 | A kind of cylinder type Ore microwave pretreatment device and using method thereof |
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