CN202717823U - Molybdenum sulfide concentrate oxygen enrichment calcination device - Google Patents
Molybdenum sulfide concentrate oxygen enrichment calcination device Download PDFInfo
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- CN202717823U CN202717823U CN 201220396623 CN201220396623U CN202717823U CN 202717823 U CN202717823 U CN 202717823U CN 201220396623 CN201220396623 CN 201220396623 CN 201220396623 U CN201220396623 U CN 201220396623U CN 202717823 U CN202717823 U CN 202717823U
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- kiln body
- oxygen
- sulfide concentrate
- moly
- enriched air
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Abstract
A molybdenum sulfide concentrate oxygen enrichment calcination device is characterized by at least comprising a kiln body composed of refractory bricks and thermal insulation materials, riding wheels supporting the kiln body, and a transmission gear driving the kiln body to rotate. The upstream of the kiln body is provided with a feeding machine which pushes raw materials to be fed downstream, and an induced draft fan which absorbs oxygen-enriched air from the downstream. A feed inlet of raw material molybdenum concentrate is arranged in the upstream of the kiln body, and a discharge outlet of the molybdenum concentrate is arranged in the downstream of the kiln body. An inlet of the oxygen-enriched air is arranged in the downstream of the kiln body, and an outlet of sulfur dioxide is arranged in the upstream of the kiln body. A flue of off-gas is also arranged on the upstream of the kiln body. An auxiliary heating device used to maintain the temperature of the kiln body is arranged on the side wall of the kiln body. An air inlet is in butt joint with an oxygen-enriched air source in sealed mode. A seal valve is arranged at the discharge outlet. The molybdenum sulfide concentrate oxygen enrichment calcination device is beneficial to saving energy and reducing consumption, facilitates centralized processing and utilization of the off-gas, is convenient to operate, and improves the molybdenum metal recovery rate.
Description
Technical field
The utility model relates to a kind of moly-sulfide concentrate roasting apparatus, particularly a kind of moly-sulfide concentrate oxygen-enriched air roasting equipment.
Background technology
From the concentrated molybdenum ore that Molybdenum Mine is produced, the first operation that enters smelting process is exactly oxidizing roasting, and moly-sulfide is changed into industrial molybdenum oxide in advance.
At present, the general-purpose equipment of roasting process mainly contains reverberatory furnace, rotary kiln and multiple hearth furnace.The energy-conserving and environment-protective performance of reverberatory furnace is relatively poor, and multiple hearth furnace investment is large especially, and rotary kiln energy-conserving and environment-protective performance is good, invests lowlyer, and therefore, rotary kiln will be the main production equipments of concentrated molybdenum ore oxidizing roasting.
Yet, when concentrated molybdenum ore adopts rotary kiln to carry out oxidizing roasting, adopt indirect heating, namely adopt fuel at rotary kiln boiler tube external heat, concentrated molybdenum ore is oxidizing roasting in boiler tube, and roasting process adopts air as oxygenant fully, and the calcination rotary kiln boiler tube communicates with atmosphere.
Roasting process carries out under high temperature (400 ~ 700 ℃), and the main chemical reactions of generation is:
MoS
2+3.5O
2=MoO
3+2SO
2↑+995.1J
Roasting process itself is a thermopositive reaction, and in theory, after combustion reactions occured, the heat that is discharged by its reaction itself is enough to keep react to be proceeded, and need not external heat source it is carried out boosting.But because the oxygenant of reaction is airborne oxygen, make to contain in the air of oxygenant other gases such as a large amount of nitrogen, these gases all will be heated to about 500 ℃, and tail gas is taken away a large amount of heats, so reaction process still need be carried out boosting.
The utility model content
The purpose of this utility model provides a kind of moly-sulfide concentrate oxygen-enriched air roasting equipment, and it is conducive to save energy and reduce the cost, is convenient to, and tail gas focuses on and utilization, convenient operation and the raising molybdenum rate of recovery.
For this reason, the utility model provides a kind of moly-sulfide concentrate oxygen-enriched air roasting equipment, it is characterized in that, it comprises the kiln body that is made of refractory brick and lagging material, the support roller of the described kiln body of supporting, the transmitting gear that the described kiln body of driving rotates at least; The upstream of described kiln body is provided with the feeding machine that promotes downstream feeding of raw material and the induced draft fan of drawing rich foster air from the downstream; The opening for feed of raw material concentrated molybdenum ore is arranged on the upstream of described kiln body, and the discharge port of concentrated molybdenum ore is arranged on the downstream of described kiln body; The entrance of oxygen-rich air is arranged on the downstream of described kiln body, and the sulfurous gas outlet is arranged on the upstream of described kiln body, and the flue of tail gas also is arranged on the upstream of described kiln body; Be arranged on the sidewall of described kiln body for the assisted heating device that keeps described kiln temperature, blast inlet docks hermetically with the oxygen-rich air source; And the discharge port place is provided with seal valve.
Preferably, the sulfurous gas outlet is communicated with desulfurization or acid-producing apparatus.
Preferably, the flue of tail gas is communicated with dust collection device.
Preferably, the blast inlet place is provided with the transparent observing mirror.
Preferably, described kiln body is provided with the inclination angle of 0 ~ 5 degree from the upstream to the downstream.
Preferably, described inclination angle is 1 degree.
Preferably, also comprise opening for feed temperature controller and discharge port temperature controller, the temperature of opening for feed temperature controller control opening for feed is 400 ~ 500 ℃, and the temperature of discharge port temperature controller control discharge port is about 650 ℃.
Preferably, also be provided with the middle part temperature regulator, control middle part temperature is about 550 ℃.
Preferably, the maturing temperature in the described kiln body is controlled at 400 ~ 700 ℃, and 3 temperature controllers are set in the kiln body at least.
Preferably, 3 ~ 6 temperature controllers are set in the kiln body.
According to the utility model, in rotary kiln, pass into oxygen-rich air, because its oxygen level is high, can greatly reduce the air total amount that enters in the kiln, greatly reduce the heat that high-temperature tail gas is taken away, be conducive to save energy and reduce the cost, reduce the boosting amount, simultaneously, because the tail gas amount reduces, sulfur dioxide in tail gas concentration raises, and provides possibility for utilizing the tail gas extracting sulfuric acid, also provides convenience for tail gas focuses on.Because concentrated molybdenum ore more easily reacts in oxygen-rich air, so that becoming, reaction process is more prone to control, reduced operation easier, simultaneously can stabilized product quality, improve the molybdenum rate of recovery.
Description of drawings
Fig. 1 is the structural representation according to the moly-sulfide concentrate oxygen-enriched air roasting equipment of prior art.
Fig. 2 is the structural representation according to moly-sulfide concentrate oxygen-enriched air roasting equipment of the present utility model.
Embodiment
Utilize oxygen-rich air to replace normal air and carry out oxidizing roasting as oxygenant, with the manufacture molybdenum oxide.Oxygen-rich air can adopt industrial oxygen or make with oxygenerator.
Back yard industry calcination rotary kiln (tail gas hourly (main component is nitrogen, oxygen and sulfurous gas) quantity discharged 11000m of Φ 1000mm * 20000mm)
3About, the temperature of tail gas is about 350 ℃ ~ 400 ℃ (623k ~ 673k).
The heat of taking away (kJ/h) Q=Cp * m * Δ k=Cp * ρ * V * (k
2-k
1)
Cp-constant voltage hot melt, 1.009kJ/kgk
The m-amount, kg
The Δ k-temperature difference, k
ρ-density, 1.293kg/m
3
V-volume, m
3
So, the heat (specific heat capacity of tail gas is approximate to be calculated according to the air ratio thermal capacitance) that industrial rotary kiln is per hour taken away:
Q
1=1.009kJ/kg·k×1.293kg/m
3×11000m
3×(623k-293k)=4.74×10
6kJ
Q
2=1.009kJ/kg·k×1.293kg/m
3×11000m
3×(673k-293k)=5.45×10
6kJ
That is, the separate unit rotary kiln per hour the heat taken away of tail gas be approximately 4.74 * 10
6~ 5.45 * 10
6KJ/h amounts to into approximately 0.16 ~ 0.19 ton/h of mark coal, and the heat of namely taking away every day is equivalent to the heat that 3.84 ~ 4.56 tons of mark coals discharge.
Adopt oxygen-rich air to replace air to carry out roasting, if oxygen content is the twice (approximately 41.86%) of content of oxygen in air in the oxygen-rich air, half of the tail gas amount that produces when then the tail gas amount approximately is equivalent to adopt air to carry out roasting as oxygenant, half of the heat that tail gas was taken away when the heat of taking away in the tail gas also was about air roasting.Save approximately 1.92 ~ 2.28 tons/balcony of mark coal.
Concentrated molybdenum ore adds from the rotary kiln opening for feed, passes into oxygen-rich air in from discharge port end toward rotary kiln, and oxygen-rich air in the rotary kiln boiler tube redox reaction occurs, generation industrial molybdenum oxide intermediates and sulfur dioxide gas.
Preferably, in the described oxygen-rich air oxygen content greater than 21%.
Preferably, the rotary kiln interior reaction temperature is 400 ~ 700 ℃.
Preferably, do not communicate with atmosphere in the rotary kiln, avoid gas and atmosphere generation mass transfer in the rotary kiln, in order to avoid reduce the oxygen concentration that enters gas in the kiln.
Preferably, material oxygen-rich air and the countercurrent flow of moly-sulfide concentrate in the rotary kiln.
The utlity model has a series of beneficial effect.For example, be oxygen-rich air owing to what in rotary kiln, pass into, its oxygen level is high, can greatly reduce the air total amount that enters in the kiln, greatly reduces the heat that high-temperature tail gas is taken away, and is conducive to save energy and reduce the cost.
In addition, the tail gas total amount reduces, and is conducive to focus on.
In addition, sulfur dioxide in tail gas concentration raises, may for utilizing the tail gas extracting sulfuric acid to provide.
In addition, during the rotary kiln firing up, when in kiln, dropping into concentrated molybdenum ore, pass into oxygen-rich air, can shorten the heating-up time, because oxygen content is high in the oxygen-rich air, can effectively reduce the burning-point of concentrated molybdenum ore.
In addition, utilize efficiently the reaction heat that discharges in the concentrated molybdenum ore combustion processes, can greatly reduce the boosting amount.
In addition, because concentrated molybdenum ore more easily reacts, be more prone to control so that reaction process becomes in oxygen-rich air, reduce operation easier.
In addition, with respect to normal air, oxygen concentration increases greatly in the oxygen-rich air, is conducive to improve the quality of industrial molybdenum oxide, reduces the sulphur content in the industrial molybdenum oxide, improves the molten rate of ammonia of industrial molybdenum oxide, finally improves the molybdenum rate of recovery.
Because chemical reaction MoS
2+ 3.5O
2=MoO
3+ 2SO
2↑+995.1J itself is a reversible process, and its reaction is still carried out to the right left, and reacts the speed of carrying out, and depends on the factors such as concentration of reaction conditions and reactant and product.Improve the concentration of oxygen, be equivalent to increase the concentration of reactant, be conducive to chemical reaction and carry out to the right, namely be conducive to improve MoS
2Be converted into MoO
3Transformation efficiency.
MoS
2Be converted into MoO
3Operation afterwards is that ammonia is molten, carries out solid-liquid separation after ammonia is molten.In the molten process of ammonia, molybdenum enters into solution and forms ammonium molybdate solution, and ammonium molybdate is produced in sour heavy crystallization after purifying, and the ammonia leaching residue that has after ammonia is molten adopts the mode of soda boiling or high pressure soda boiling further to reduce mutually middle molybdenum content of slag, perhaps no longer processes.
Because MoS
2No matter be insoluble to alkali, be the molten or soda boiling of ammonia, MoS
2All the time slag can be entered into quite, finally also the ammonium molybdate product can be do not formed.So the quality of the industrial molybdenum oxide after the roasting has directly determined the metal recovery rate of molybdenum.
The industrial molybdenum oxide that the method for employing oxygen-enriched air roasting is produced can improve MoS
2Be converted into MoO
3Transformation efficiency, improve the molten rate of ammonia of industrial molybdenum oxide, the rate of recovery that namely can the Effective Raise molybdenum reduces production costs.
In the embodiment shown in fig. 1, the opening for feed of Reference numeral 1 expression raw material concentrated molybdenum ore; The discharge port of Reference numeral 2 expression concentrated molybdenum ores; The entrance of Reference numeral 3 expression oxygen-rich air; Reference numeral 4 expression assisted heating devices; Reference numeral 5 expression feeding machines; Reference numeral 6 expression support rollers; Reference numeral 7 expression flues; Reference numeral 8 expression sulfurous gas outlets; Reference numeral 9 expression kiln bodies; Reference numeral 10 expression refractory brick; Reference numeral 11 expression lagging materials; Reference numeral 12 expression transmitting gears.
The utility model is that oxygen-rich air is passed in the calcination rotary kiln 9 from entrance 3, at high temperature, utilizes oxygen-rich air and concentrated molybdenum ore generation redox reaction.The raw material concentrated molybdenum ore adds from rotary kiln opening for feed 1, and boiler tube has certain inclination angle, and along with the rotation of body of heater 9, concentrated molybdenum ore slowly 2 moves from feed end 1 to discharge port; Controlling feed end 1 temperature by temperature controller is 400 ~ 500 ℃, and discharge port 2 end temperature are about 650 ℃.Oxygen-rich air passes into from rotary kiln blast inlet 3, moves toward opening for feed 1 end by blower fan.Oxygen-rich air meets with the moly-sulfide concentrate in rotary kiln, through the surface diffusion of airborne oxygen molecule to the molybdenum glance particle, oxygen molecule is diffused into after the brightness concentrated molybdenum ore particle surface, under the surface atom field of force of brightness concentrated molybdenum ore, airborne oxygen is produced absorption, oxygen and the molybdenumdisulphide of absorption react, formation reaction thing molybdic oxide or molybdenum dioxide and sulfur dioxide gas, the sulfurous gas desorption desorb of reactant, spread to table by inner, by a series of heat and mass transfer process generation redox reactions such as phase interface spread in the air, generate the product industrial molybdenum oxide again.
In 9 li in rotary kiln boiler tube, molybdenumdisulphide content reduces to discharge port 2 ends successively from opening for feed 1 end; Molybdic oxide content raises to discharge port 2 ends successively from opening for feed 1 end; Oxygen content raises to discharge port 2 ends successively from opening for feed 1 end, and sulfur dioxide concentration reduces to discharge port 2 ends successively from opening for feed 1 end.Rotary kiln boiler tube peripheral hardware has assisted heating device 4, boosting when inadequate for temperature in the boiler tube.
Rotary kiln opening for feed 1 end is provided with induced draft fan, furnace gas is drawn to opening for feed 1 end by discharge port 2 ends, to guarantee gas and solid countercurrent flow in boiler tube.Be provided with behind opening for feed 1 end and gather dust and the installations and facilities such as desulfurization or relieving haperacidity.The molybdic oxide product brings out from discharge port 2.
In Fig. 1, the right-hand member of rotary kiln body is upstream (the namely stove inner exhaust gas outlet of feed end, opening for feed and sulfurous gas all is located at this end), left end is downstream (discharge end, discharge port and oxygen-enriched inlet are located at this end), whole kiln body is provided with 0 ~ 5 ° inclination angle (being generally 1 degree), rotation by body of heater, the raw material that adds body of heater from feed end slowly moves to discharge port end, and the kiln body is not horizontally disposed with.Oxygen-rich air enters from the discharging port, with solid materials inverse motion in the stove, and with stove in material react, the tail gas of generation is drawn from the charging port by the induced draft fan that is located at the charging port.Rotary kiln shown in Figure 1 is existing installation, Reference numeral 3 expression blast inlets (advancing air, uncovered), Reference numeral 2 expression discharge ports.Reach effect of the present utility model, only need blast inlet 3 is docked by tightness system 31 with the oxygen-rich air source, discharge port 2 places add a seal valve 21, change intermittent take-off into by continuous discharge and get final product.For obtaining better effect, can increase the volume of discharge port feed bin (being positioned at discharge port 2 tops, blast inlet 3 right parts), the feed bin of discharge port is with respect at least 1.5 times of dilatations of prior art; And can add at blast inlet 3 places a transparent observing mirror.
Moly-sulfide concentrate oxygen-enriched air roasting technique according to the utility model enforcement, behind the calcination rotary kiln firing up, (volume fraction of oxygen is greater than the air of average oxygen purity in the air to pass into oxygen-rich air in the calcination rotary kiln, usually oxygen level is about 20.93% in the air), replace air and carry out oxidizing roasting.Roasting process mainly is the redox reaction that (400 ~ 700 ℃) carry out under the high temperature, needs to consume a large amount of oxygen, passes into oxygen-rich air in rotary kiln, because its oxygen level is high, can greatly reduce the air total amount that enters in the kiln, greatly reduce the heat that high-temperature tail gas is taken away, be conducive to save energy and reduce the cost, reduce the boosting amount, simultaneously, because the tail gas amount reduces, sulfur dioxide in tail gas concentration raises, for utilizing the tail gas extracting sulfuric acid that possibility is provided, also for focusing on, tail gas provides convenience.Because concentrated molybdenum ore more easily reacts in oxygen-rich air, so that becoming, reaction process is more prone to control, reduced operation easier, simultaneously can stabilized product quality, improve the molybdenum rate of recovery.
The utility model content goes for all and utilizes air to carry out chemical reaction or the smelting process of boosting as the needs of oxygenant, also applicable to other smelting equipment (such as fluidizing furnace, zinc smelting etc.).Those skilled in the art can carry out such or such modification, perfect or additional to the technical solution of the utility model according to above disclosed content, yet, do so all and will fall into protection domain of the present utility model.
Claims (10)
1. a moly-sulfide concentrate oxygen-enriched air roasting equipment is characterized in that, it comprises the kiln body that is made of refractory brick and lagging material, the support roller of the described kiln body of supporting, the transmitting gear that the described kiln body of driving rotates at least; The upstream of described kiln body is provided with the feeding machine that promotes downstream feeding of raw material and the induced draft fan of drawing rich foster air from the downstream; The opening for feed of raw material concentrated molybdenum ore is arranged on the upstream of described kiln body, and the discharge port of concentrated molybdenum ore is arranged on the downstream of described kiln body; The entrance of oxygen-rich air is arranged on the downstream of described kiln body, and the sulfurous gas outlet is arranged on the upstream of described kiln body, and the flue of tail gas also is arranged on the upstream of described kiln body; Be arranged on the sidewall of described kiln body for the assisted heating device that keeps described kiln temperature, blast inlet docks hermetically with the oxygen-rich air source; And the discharge port place is provided with seal valve.
2. moly-sulfide concentrate oxygen-enriched air roasting equipment as claimed in claim 1 is characterized in that, the sulfurous gas outlet is communicated with desulfurization or acid-producing apparatus; And/or the flue of tail gas is communicated with dust collection device.
3. moly-sulfide concentrate oxygen-enriched air roasting equipment as claimed in claim 1 is characterized in that at least 1.5 times of the feed bin dilatations of discharge port; And/or the blast inlet place is provided with the transparent observing mirror.
4. moly-sulfide concentrate oxygen-enriched air roasting equipment as claimed in claim 1, it is characterized in that, the oxygen-rich air source is industrial oxygen, or industrial oxygen and the gas mixture that purifies air, and the volume fraction that passes into the oxygen in the oxygen-rich air is 21% air greater than oxygen purity.
5. moly-sulfide concentrate oxygen-enriched air roasting equipment as claimed in claim 1 is characterized in that, described kiln body is provided with the inclination angle of 0 ~ 5 degree from the upstream to the downstream.
6. moly-sulfide concentrate oxygen-enriched air roasting equipment as claimed in claim 5 is characterized in that, described inclination angle is 1 degree.
7. moly-sulfide concentrate oxygen-enriched air roasting equipment as claimed in claim 1, it is characterized in that, also comprise opening for feed temperature controller and discharge port temperature controller, maturing temperature in the described kiln body is controlled at 400 ~ 700 ℃, the temperature of opening for feed temperature controller control opening for feed is 400 ~ 500 ℃, and the temperature of discharge port temperature controller control discharge port is about 650 ℃.
8. moly-sulfide concentrate oxygen-enriched air roasting equipment as claimed in claim 7 is characterized in that, also is provided with the middle part temperature regulator, and control middle part temperature is about 550 ℃.
9. moly-sulfide concentrate oxygen-enriched air roasting equipment as claimed in claim 1 is characterized in that, 3 temperature controllers are set in the described kiln body at least.
10. moly-sulfide concentrate oxygen-enriched air roasting equipment as claimed in claim 9 is characterized in that, 3 ~ 6 temperature controllers are set in the kiln body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220396623 CN202717823U (en) | 2012-08-10 | 2012-08-10 | Molybdenum sulfide concentrate oxygen enrichment calcination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220396623 CN202717823U (en) | 2012-08-10 | 2012-08-10 | Molybdenum sulfide concentrate oxygen enrichment calcination device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202717823U true CN202717823U (en) | 2013-02-06 |
Family
ID=47619651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220396623 Expired - Lifetime CN202717823U (en) | 2012-08-10 | 2012-08-10 | Molybdenum sulfide concentrate oxygen enrichment calcination device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202717823U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796865A (en) * | 2012-08-10 | 2012-11-28 | 江西稀有稀土金属钨业集团有限公司 | Device and technology for oxygen-enriched roasting of molybdenum sulfide concentrate |
-
2012
- 2012-08-10 CN CN 201220396623 patent/CN202717823U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796865A (en) * | 2012-08-10 | 2012-11-28 | 江西稀有稀土金属钨业集团有限公司 | Device and technology for oxygen-enriched roasting of molybdenum sulfide concentrate |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130206 |