CN202671619U - Multi-hearth furnace carbon-free molybdenum concentrate roasting device - Google Patents
Multi-hearth furnace carbon-free molybdenum concentrate roasting device Download PDFInfo
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- CN202671619U CN202671619U CN 201220295169 CN201220295169U CN202671619U CN 202671619 U CN202671619 U CN 202671619U CN 201220295169 CN201220295169 CN 201220295169 CN 201220295169 U CN201220295169 U CN 201220295169U CN 202671619 U CN202671619 U CN 202671619U
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Abstract
The utility model discloses a multi-hearth furnace carbon-free molybdenum concentrate roasting device. The multi-hearth furnace carbon-free molybdenum concentrate roasting device comprises a multi-hearth furnace and a surface cooler, wherein flue gas collecting pipelines which are arranged at the front side and the rear side of a furnace hearth of the multi-hearth furnace are connected with an input end of the surface cooler through a connecting pipeline, an exhaust outlet of the surface cooler is divided into two branches through an exhaust pipeline, one branch of the exhaust outlet is communicated with the atmosphere through a first pipeline and an emptying valve which is arranged on the first pipeline, the other branch of the exhaust outlet is respectively connected with the first ends of main gas supply pipelines which are arranged at the left side and the right side of the furnace hearth of the multi-hearth furnace through a second pipeline and an induced air valve which is arranged on the second pipeline, the tail ends of the main gas supply pipelines are sealed, the main gas supply pipelines are provided with a plurality of branch pipelines, and the branch pipelines are connected with air inlets which are arranged on the outer wall of the multi-hearth furnace. The multi-hearth furnace carbon-free molybdenum concentrate roasting device disclosed by the utility model has the advantages that the structure is simple, the operation is simple and convenient, the maintenance is easy, the maintenance cost is low, the energy is saved, the consumption is reduced, the carbon-free roasting is realized, the day production of the multi-hearth furnace is increased, the quality of molybdenum trioxide is increased, the molybdenum soluble rate is obviously increased, and the recovery rate of the molybdenum roasting is increased.
Description
Technical field
The utility model belongs to the non-ferrous metallurgy technology field, especially relates to the carbon-free calcining molybdenum concentrate device of a kind of multiple hearth furnace.
Background technology
Molybdenum is a kind of sulfophilic element, molybdenum glance (MoS
2) be the main occurrence status of molybdenum.All concentrated molybdenum ores of domestic and international application approximately have 96% all to be to adopt the method for roasting to change into oxidation molybdenum ore, i.e. industrial molybdenum oxide at present.Industrial molybdenum oxide and ammoniacal liquor reaction obtain ammonium molybdate, can obtain highly purified molybdenum oxide again by roasting method or subliming method, continue to use hydrogen reducing, finally can obtain the molybdenum powder of purity 99. 98%.
Existing calcining molybdenum ore concentrate technique mainly contains reverberatory furnace sinter process, rotary kiln baking technique, multiple hearth furnace sinter process and fluidized bed furnace sinter process.Reverberatory furnace baking modes less investment, instant effect, easy to operate, still, mechanization degree is low, and labour intensity is large, and the molybdenum loss is many, and discontinuity goes out pan feeding, is a kind of production technique of backwardness, seldom adopts in scale operation; The fluidized bed furnace sinter process has advantages of that the oxidation sweetening rate is high, is widely used in the smelting production of sulphide ores, uses to some extent abroad, domestic at present not yet application; Rotary kiln baking mode less investment, equipment and technique are simple, and still, throughput is little, and converter life is short, and productivity is low, and calcining contains MoO
2Height affects the extraction yield of follow-up Ammonia leaching molybdenum; Multiple hearth furnace baking modes structure is comparatively simple, and mechanization degree is high, and throughput is large, and sweetening effectiveness is good, and quality product is high, and the calcining sulphur content is low, is the most widely calcining molybdenum ore concentrate technique of present domestic and international application.
In multiple hearth furnace calcining molybdenum concentrate technique, multiple hearth furnace is generally by 8～16 layers, and during roasting, concentrated molybdenum ore adds the first layer by furnace roof, and successively by each layer of stove, the finished product are discharged by bottom.Various reactions occur by in the multiple hearth furnace process in concentrated molybdenum ore successively.Take 12 layers multiple hearth furnaces as example, the 3rd layer of top the 1st, 2 layers and part mainly are flotation agent and the part MoS in the volatilization material
2Oxidation, the 3rd～5 layer mainly is that concentrated molybdenum ore is oxidized to MoO
2And part MoO
2Further be oxidized to MoO
3, the 6th～8 layer mainly is MoO
2Be oxidized to MoO
3, the 9th layer of later on then further desulfurization.Each layer all is equipped with burner in the multiple hearth furnace burner hearth, and burner uses Sweet natural gas to be raw material, so that various reactions occur concentrated molybdenum ore; Send into air by air intlet toward burner hearth, the assurance oxidising process can be kept.The oxidation of whole concentrated molybdenum ore, sweetening process need a large amount of oxygen, in order better to regulate the temperature of each layer, air is entered by the air intlet on each layer respectively, also can be by the vision slit input air on the service gate, oxidation is provided on the one hand, take away on the other hand the part heat, overheated to prevent, by being set, air intlet or vision slit can control the amount that air flows into.The high-temperature flue gas that the multiple hearth furnace roasting produces is discharged by the flue of burner hearth both sides, and flue-gas temperature is 480～530 ℃.High-temperature flue gas enters surface cooler after collecting, cool, and makes flue-gas temperature be down to 290～300 ℃, sends into follow-up dedusting, relieving haperacidity operation again, carries out harmless treatment.The high-temperature hot air that produces after the surface cooler heat exchange is by directly emptying.
In the multiple hearth furnace calcining molybdenum concentrate process, heated by natural gas needs combustion air, the oxidation of concentrated molybdenum ore, sweetening process need a large amount of oxygen-rich air, existing multiple hearth furnace sinter process is that normal temperature air is directly sent in the multiple hearth furnace burner hearth, easily cause hardening of siege furnace charge, the rake teeth wearing and tearing that furnace charge hardens and can cause rake arm equipped on the multiple hearth furnace central stirring shaft increase maintenance cost; Normal temperature air is entered in the burner hearth by the air intlet on each layer of multiple hearth furnace, can make concentrated molybdenum ore cause loss by air intlet, affects the rate of recovery of calcining molybdenum ore concentrate.
Summary of the invention
In order to address the above problem, the purpose of this utility model provides the carbon-free calcining molybdenum concentrate device of a kind of multiple hearth furnace, it can utilize a large amount of heat energy that run off waste in the multiple hearth furnace calcining molybdenum concentrate production process of the prior art again, thereby reduce the consumption of fuel in the multiple hearth furnace calcining molybdenum concentrate production process, until the carbon-free baked for producing that realization does not need to consume gas fuel fully.
For achieving the above object, the utility model adopts following technical scheme:
The carbon-free calcining molybdenum concentrate device of a kind of multiple hearth furnace, it includes multiple hearth furnace and surface cooler, the flue gas conduit of both sides is connected with the input terminus of surface cooler by connecting tube before and after the multiple hearth furnace burner hearth, the surface cooler outer setting has a cooling blower, the venting port of surface cooler is divided into two-way by gas exhaust duct, the exhaust-valve that arranges on the first pipeline and the first pipeline of leading up to communicates with atmosphere, the citation damper that another road arranges on second pipe and second pipe is connected with the main supply feed channel head end that the multiple hearth furnace burner hearth left and right sides arranges respectively, main supply feed channel tail end sealing, be provided with several small transfer lines on the main supply feed channel, the blast inlet that offers on small transfer line and the multiple hearth furnace outer wall is connected.
In the carbon-free calcining molybdenum concentrate device of above-mentioned multiple hearth furnace, be provided with under meter on its second pipe.
In the carbon-free calcining molybdenum concentrate device of above-mentioned multiple hearth furnace, the aperture of its exhaust-valve and citation damper meets the demands: the summation that the high temperature air flow that the surface cooler venting port is discharged equals to enter the high temperature air flow in the first pipeline, the second pipe; Guarantee to introduce the high temperature air stability of flow in the multiple hearth furnace burner hearth, and guarantee the cooling performance of surface cooler.
In the carbon-free calcining molybdenum concentrate device of above-mentioned multiple hearth furnace, the flue gas conduit outside of both sides is provided with interchanger before and after its burner hearth, two branch end of second pipe are connected with the input terminus of two interchanger respectively, and the output terminal of two interchanger is connected with the main supply feed channel head end that the multiple hearth furnace burner hearth left and right sides arranges respectively.
In the carbon-free calcining molybdenum concentrate device of above-mentioned multiple hearth furnace, the position of several small transfer lines on its main supply feed channel arranges basis principle and is: in the multiple hearth furnace body of heater, and flotation agent and part MoS in the volatilization material
2Each layer of top of oxidizing reaction in, small transfer line is corresponding one by one with every one deck, concentrated molybdenum ore is oxidized to MoO
2And MoO
2Be oxidized to MoO
3Each layer of middle part of oxidizing reaction in, small transfer line is pressed interlayer every setting, further in each layer of bottom of desulphurization reaction, small transfer line is corresponding one by one with every one deck.
In the carbon-free calcining molybdenum concentrate device of above-mentioned multiple hearth furnace, the quantity of several small transfer lines on its main supply feed channel arranges basis principle: in the multiple hearth furnace body of heater, in each corresponding with small transfer line layer, offer 2～6 blast inlets on the outer wall of every one deck, blast inlet is connected with small transfer line.
In the carbon-free calcining molybdenum concentrate device of above-mentioned multiple hearth furnace, in several small transfer lines on its main supply feed channel, be provided with motor-driven control valve and flow detector on each small transfer line, the blast inlet place that is connected, is opened in small transfer line on the multiple hearth furnace outer wall is provided with baffle-box.
Owing to adopting aforesaid technical scheme, the utlity model has following superiority:
The carbon-free calcining molybdenum concentrate device of this multiple hearth furnace, the high-temperature flue gas that its multiple hearth furnace roasting produces in surface cooler with air heat exchange after, the venting port of surface cooler is discharged high temperature air, by this high temperature air is introduced in the multiple hearth furnace, with the normal temperature air that replaces in the prior art in the multiple hearth furnace burner hearth, sending into, this part waste heat is utilized effectively, and can make the burner of each layer in the multiple hearth furnace burner hearth out of service, fully no longer consume raw natural gas in the normal production phase, reduce energy consumption, reach the purpose of save energy, realize the carbon-free calcining molybdenum concentrate of multiple hearth furnace; By in multiple hearth furnace, introducing high temperature air, improved the daily handling ability of multiple hearth furnace, a day operation amount increases, and has improved the processing power to the higher concentrated molybdenum ore of alkali metal content, has improved the SO in the flue gas that roasting process produces
2Concentration, thereby be conducive to reduce the energy consumption of flue gas treatment process; Improved the quality of molybdic oxide, sulphur content obviously descends, and solvable molybdenum rate significantly increases; Reduce the fluctuation of temperature in the multiple hearth furnace, make things convenient for the control of temperature in the multiple hearth furnace; By in multiple hearth furnace, introducing high temperature air, avoided hardening of siege furnace charge, reduced siege cleaning frequency, also reduced because the rake teeth wearing and tearing that furnace charge hardens and brings have reduced maintenance cost; Also reduce the concentrated molybdenum ore that is caused by feeding oxygen hole and run off, improved the rate of recovery of molybdenum roasting.
The carbon-free calcining molybdenum concentrate device of this multiple hearth furnace, it is simple in structure, easy and simple to handle, for ease of maintenaince, be convenient to control, by adopting the electric autocontrol system, can detect Real-Time Parameters such as the flow of each pipeline place warm air, temperature, and according to measuring result and manufacturing technique requirent, each valve is regulated control in real time, satisfy production requirement; The electric autocontrol system is operation interface and operation ease intuitively, has greatly improved the temperature control of multiple hearth furnace and the stability of technic index.
Description of drawings
Fig. 1 is the structural representation of the carbon-free calcining molybdenum concentrate device of the utility model multiple hearth furnace;
Fig. 2 is the plan structure schematic diagram of Fig. 1 one embodiment;
Among the figure: the 1-interchanger; The 2-second pipe; 2.1-branch end; The 3-under meter; The 4-citation damper; The 5-exhaust-valve; 6-the first pipeline; 7-dedusting, sulphuric acid plant; The 8-surface cooler; 8.1-gas exhaust duct; The 9-cooling blower; The 10-connecting tube; 11(a, b)-the main supply feed channel; The 12-small transfer line; 13-flue gas conduit; The 14-multiple hearth furnace; The 15-motor-driven control valve; The 16-baffle-box.
Embodiment
Below in conjunction with the drawings and specific embodiments the technical solution of the utility model is described in further detail.
Such as Fig. 1, shown in 2, the carbon-free calcining molybdenum concentrate device of this multiple hearth furnace, it includes multiple hearth furnace 14 and surface cooler 8, the flue gas conduit 13 of both sides is connected with the input terminus of surface cooler 8 by connecting tube 10 before and after the multiple hearth furnace burner hearth, surface cooler 8 outer setting have a cooling blower 9, the venting port of surface cooler 8 is divided into two-way by gas exhaust duct 8.1, the exhaust-valve 5 that arranges on the first pipeline 6 and the first pipeline of leading up to communicates with atmosphere, the main supply feed channel 11b that the citation damper 4 that another road arranges on second pipe 2 and second pipe arranges with the multiple hearth furnace burner hearth left and right sides respectively, main supply feed channel 11a head end connects, main supply feed channel 11b, main supply feed channel 11a tail end sealing, main supply feed channel 11b, be provided with several small transfer lines 12 on the main supply feed channel 11a, the blast inlet that offers on small transfer line and the multiple hearth furnace outer wall is connected.
In the carbon-free calcining molybdenum concentrate device of above-mentioned multiple hearth furnace, be provided with under meter 3 on its second pipe 2, be used for measuring the high temperature air flow of introducing in multiple hearth furnace 14 burner hearths.
Described exhaust-valve 5 meets the demands with the aperture of citation damper 4: the summation that the high temperature air flow that surface cooler 8 venting ports are discharged equals to enter the high temperature air flow in the first pipeline 6, the second pipe 2; Guarantee to introduce the high temperature air stability of flow in the multiple hearth furnace burner hearth, and guarantee the cooling performance of surface cooler, the high temperature air flow of introducing in the multiple hearth furnace burner hearth is measured by under meter 3, and the minimum aperture of control exhaust-valve is 10%.
In the carbon-free calcining molybdenum concentrate device of above-mentioned multiple hearth furnace, flue gas conduit 13 outsides of both sides are provided with interchanger 1 before and after its burner hearth, two branch end 2.1 of second pipe 2 are connected with the input terminus of two interchanger 1 respectively, and the output terminal of two interchanger is connected with main supply feed channel 11b, the main supply feed channel 11a head end that the multiple hearth furnace burner hearth left and right sides arranges respectively.
In the carbon-free calcining molybdenum concentrate device of above-mentioned multiple hearth furnace, the position of several small transfer lines 12 on its main supply feed channel arranges basis principle and is: in the multiple hearth furnace body of heater, and flotation agent and part MoS in the volatilization material
2Each layer of top of oxidizing reaction in, small transfer line is corresponding one by one with every one deck, concentrated molybdenum ore is oxidized to MoO
2And MoO
2Be oxidized to MoO
3Each layer of middle part of oxidizing reaction in, small transfer line is pressed interlayer every setting, further in each layer of bottom of desulphurization reaction, small transfer line is corresponding one by one with every one deck.
Several small transfer lines on the main supply feed channel 11b of multiple hearth furnace burner hearth left side and several small transfer lines on the main supply feed channel 11a of right side are arranged symmetrically with.
The position of explanation small transfer line arranges as an example of 12 layers multiple hearth furnaces example: the 1st, 2,3 layer of multiple hearth furnace mainly is flotation agent and the part MoS in the volatilization material
2Oxidation, the equal correspondence of every one deck is provided with small transfer line; The 4th～9 layer of multiple hearth furnace carries out concentrated molybdenum ore and is oxidized to MoO
2And MoO
2Be oxidized to MoO
3Oxidizing reaction, the 5th, 7,9 layer the equal correspondence of every one deck is provided with small transfer line; The 10th～12 layer of multiple hearth furnace carries out further desulphurization reaction, and the equal correspondence of every one deck is provided with small transfer line.
In the carbon-free calcining molybdenum concentrate device of above-mentioned multiple hearth furnace, the quantity of several small transfer lines 12 on its main supply feed channel arranges basis principle: in the multiple hearth furnace body of heater, in each corresponding with small transfer line layer, offer 2～6 blast inlets on the outer wall of every one deck, blast inlet is connected with small transfer line.With reference to Fig. 2 as can be known, offer 4 blast inlets on the outer wall of the every one deck of multiple hearth furnace, 4 blast inlets be set to preferred version of the present utility model.
As shown in Figure 2, the carbon-free calcining molybdenum concentrate device of described multiple hearth furnace, in several small transfer lines 12 on its main supply feed channel 11b, the main supply feed channel 11a, be provided with motor-driven control valve 15 and flow detector on each small transfer line 12, the blast inlet place that is connected, is opened on multiple hearth furnace 14 outer walls with small transfer line 12 is provided with baffle-box 16.
The working process of the carbon-free calcining molybdenum concentrate device of the utility model multiple hearth furnace:
1, the high-temperature flue gas of each layer of multiple hearth furnace roasting process generation is discharged by the flue gas conduit 13 of both sides before and after the burner hearth, and flue-gas temperature is 480～530 ℃; High-temperature flue gas enters in the surface cooler 8 by connecting tube 10, via the cooling blower 9 of surface cooler outer setting, carries out the air blast cooling cooling, makes flue-gas temperature be down to 290～300 ℃, and the flue gas after the cooling enters dedusting, sulphuric acid plant 7 again;
2, the high-temperature flue gas of multiple hearth furnace roasting generation is in surface cooler 8 and after the air heat exchange, and the venting port of surface cooler is discharged high temperature air, and the high temperature air temperature is 230～270 ℃; High temperature air is divided into two-way, one the tunnel enters atmosphere via the exhaust-valve 5 that arranges on the first pipeline 6 and the first pipeline, the citation damper 4 that another road arranges on second pipe 2 and second pipe enters respectively in the interchanger 1 of flue gas conduit 13 outer setting of both sides before and after the burner hearth, in interchanger, further promoted the temperature of high temperature air by the high-temperature flue gas in the flue gas conduit 13 by heat exchange, make it to heat up 50～80 ℃, reach 280～330 ℃, after high temperature air after the intensification is discharged, enter respectively the main supply feed channel 11b that the multiple hearth furnace burner hearth left and right sides arranges from interchanger 1, among the main supply feed channel 11a; Several small transfer lines 12 that high temperature air among main supply feed channel 11b, the main supply feed channel 11a arranges on the main supply feed channel again enter each layer in the multiple hearth furnace 14, oxygen in the high temperature air fully reacts with the concentrated molybdenum ore by each layer of multiple hearth furnace successively, generates molybdic oxide; Molybdic oxide is discharged by the multiple hearth furnace furnace bottom, and the temperature that the multiple hearth furnace roasting produces is that 480～530 ℃ high-temperature flue gas is discharged by the flue gas conduit of both sides before and after the burner hearth, continues to repeat aforesaid process;
3, above-mentioned step 2 is carried out in the process, the burner work out of service of each layer in the multiple hearth furnace burner hearth, and stop to each layer of multiple hearth furnace infeed normal temperature air, realize the carbon-free calcining molybdenum concentrate of multiple hearth furnace.
Claims (7)
1. carbon-free calcining molybdenum concentrate device of multiple hearth furnace, it includes multiple hearth furnace (14) and surface cooler (8), the flue gas conduit (13) of both sides is connected with the input terminus of surface cooler by connecting tube (10) before and after the multiple hearth furnace burner hearth, the surface cooler outer setting has a cooling blower (9), it is characterized in that: the venting port of its surface cooler (8) is divided into two-way by gas exhaust duct (8.1), the exhaust-valve (5) that arranges on the first pipeline (6) and the first pipeline of leading up to communicates with atmosphere, main supply feed channel (the 11b that the citation damper (4) that another road arranges on second pipe (2) and second pipe arranges with the multiple hearth furnace burner hearth left and right sides respectively, 11a) head end connects, main supply feed channel tail end sealing, be provided with several small transfer lines (12) on the main supply feed channel, the blast inlet that offers on small transfer line and the multiple hearth furnace outer wall is connected.
2. the carbon-free calcining molybdenum concentrate device of multiple hearth furnace according to claim 1 is characterized in that: be provided with under meter on its second pipe.
3. the carbon-free calcining molybdenum concentrate device of multiple hearth furnace according to claim 1 is characterized in that: its exhaust-valve (5) meets the demands with the aperture of citation damper (4): the summation that the high temperature air flow that surface cooler (8) venting port is discharged equals to enter the high temperature air flow in the first pipeline (6), the second pipe (2); Guarantee to introduce the high temperature air stability of flow in the multiple hearth furnace burner hearth, and guarantee the cooling performance of surface cooler.
4. the carbon-free calcining molybdenum concentrate device of multiple hearth furnace according to claim 1, it is characterized in that: flue gas conduit (13) outside of both sides is provided with interchanger (1) before and after its burner hearth, two branch end (2.1) of second pipe (2) are connected with the input terminus of two interchanger respectively, and the output terminal of two interchanger is connected with main supply feed channel (11b, the 11a) head end that the multiple hearth furnace burner hearth left and right sides arranges respectively.
5. the carbon-free calcining molybdenum concentrate device of multiple hearth furnace according to claim 1, it is characterized in that: the position of several small transfer lines (12) on its main supply feed channel arranges basis principle and is: in the multiple hearth furnace body of heater, flotation agent and part MoS in the volatilization material
2Each layer of top of oxidizing reaction in, small transfer line is corresponding one by one with every one deck, concentrated molybdenum ore is oxidized to MoO
2And MoO
2Be oxidized to MoO
3Each layer of middle part of oxidizing reaction in, small transfer line is pressed interlayer every setting, further in each layer of bottom of desulphurization reaction, small transfer line is corresponding one by one with every one deck.
6. the carbon-free calcining molybdenum concentrate device of multiple hearth furnace according to claim 1, it is characterized in that: the quantity of several small transfer lines (12) on its main supply feed channel arranges basis principle and is: in the multiple hearth furnace body of heater, in each corresponding with small transfer line layer, offer 2～6 blast inlets on the outer wall of every one deck, blast inlet is connected with small transfer line.
7. the carbon-free calcining molybdenum concentrate device of multiple hearth furnace according to claim 1, it is characterized in that: in several small transfer lines (12) on its main supply feed channel (11b, 11a), be provided with motor-driven control valve (15) and flow detector on each small transfer line, the blast inlet place that is connected, is opened in small transfer line on multiple hearth furnace (14) outer wall is provided with baffle-box (16).
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|---|---|---|---|
| CN 201220295169 CN202671619U (en) | 2012-06-21 | 2012-06-21 | Multi-hearth furnace carbon-free molybdenum concentrate roasting device |
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|---|---|---|---|
| CN 201220295169 CN202671619U (en) | 2012-06-21 | 2012-06-21 | Multi-hearth furnace carbon-free molybdenum concentrate roasting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747218A (en) * | 2012-06-21 | 2012-10-24 | 洛阳钼业集团金属材料有限公司 | Process and device for carbon-free roasting of molybdenum concentrate in multi-hearth furnace |
-
2012
- 2012-06-21 CN CN 201220295169 patent/CN202671619U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747218A (en) * | 2012-06-21 | 2012-10-24 | 洛阳钼业集团金属材料有限公司 | Process and device for carbon-free roasting of molybdenum concentrate in multi-hearth furnace |
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