CN104099481B - High-temperature dust-containing flue gas purification process in tin smelting and specific equipment row - Google Patents
High-temperature dust-containing flue gas purification process in tin smelting and specific equipment row Download PDFInfo
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- CN104099481B CN104099481B CN201410304913.2A CN201410304913A CN104099481B CN 104099481 B CN104099481 B CN 104099481B CN 201410304913 A CN201410304913 A CN 201410304913A CN 104099481 B CN104099481 B CN 104099481B
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Abstract
The invention discloses a kind of can high efficiency separation go out arsenic tin smelt in high-temperature dust-containing flue gas purification process and specific equipment row.High-temperature dust-containing flue gas purification process in tin smelting, high-temperature dust-containing flue gas comes from the Industrial Stoves in tin smelting flow process, the step that this purification process comprises is: the first smoke filtration one, successively carried out described ash-laden gas and the second smoke filtration: in the first smoke filtration, temperature is in the ash-laden gas to be filtered of 460 ~ 900 DEG C by the first filtering material; In second smoke filtration, temperature is in the ash-laden gas to be filtered of 110 ~ 240 DEG C by the second filtering material; The ash-laden gas filtering accuracy of the first filtering material and the second filtering material is 0.05 ~ 1 μm, and at least the first filtering material is made up of high temperature resistant sintering inorganic porous material; Two, from the first smoke filtration, reclaim the dust obtaining high tin content; From the second smoke filtration, reclaim the dust of the high arsenic content obtained, the tail gas after the second smoke filtration enters follow-up vent gas treatment.
Description
The present invention is April 29 2013 applying date, application number 2013101566360, the divisional application of application for a patent for invention that name is called " the high-temperature dust-containing flue gas purification process in tin smelting and specific equipment row ".
Technical field
The present invention relates to the flue gases purification in tin field of smelting, be specifically related to the high-temperature dust-containing flue gas purification process in tin smelting and specific equipment row.
Background technology
Current tin is smelted production and is generally comprised four main process: one is refine front calcination process to Tin concentrate; Two is carry out retailoring to stannic oxide concentrate or Tin concentrate calcining; Three is carry out sulfiding volatilization to the rich slag of the tin of retailoring operation output; Four is carry out refining to the thick tin of retailoring operation output.In the prior art, the Industrial Stoves for refining front calcination process to Tin concentrate mainly contain multiple hearth furnace, fluidizing furnace or rotary kiln; Industrial Stoves for carrying out retailoring to stannic oxide concentrate or Tin concentrate calcining mainly contain reverberatory furnace, electric arc furnace, Ausmelt furnace or Isa smelting stove; Industrial Stoves for carrying out sulfiding volatilization to the rich slag of the tin of retailoring operation output are mainly fuming furnace.When tin is smelted and produced, these Industrial Stoves above-mentioned all can output high-temperature dust-containing flue gas, therefore, to the process of these high-temperature dust-containing flue gas just become tin smelt produce in the important topic that can not be ignored.
Boiling roaster for Tin concentrate: first current Tin concentrate calcination process technique be obtain calcining and high-temperature dust-containing flue gas respectively by boiling roaster, containing the As that most of arsenic in former Tin concentrate generates through oxidizing roasting in this high-temperature dust-containing flue gas
2o
3steam and a large amount of stanniferous dust, first this ash-laden gas is admitted to tornado dust collector and carries out preliminary gas solid separation, and the content reclaiming tin in the dust that obtains is higher, directly can return boiling roaster, and due to the efficiency of dust collection of tornado dust collector lower, As
2o
3steam and more stanniferous dust escape and enter surface cooler from the venting port of tornado dust collector and cool further, at this moment, and As
2o
3steam changes As into
2o
3solid-state junction crystal, after this, carries out udst separation by fiber bag precipitator to ash-laden gas, and reclaim and obtain high arsenic powder dirt, tail gas then enters follow-up desulfurization process, and finally enters air; Gained height arsenic powder dirt is then sent to again electric heating rotary kiln and heats, the As produced
2o
3steam is by obtaining high-grade arsenic dirt after condensation and two-stage cloth-sack-type dust removal, and the residue after volatilization then returns tin and smelts main flow process.
Fuming furnace volatilization for the rich slag of tin: first the fuming furnace volatilization treatment process of the rich slag of current tin is obtain waste residue and ash-laden gas respectively by fuming furnace sulfiding volatilization, containing the As that most arsenic in the rich slag of former tin generates through oxidizing roasting in this ash-laden gas
2o
3steam and a large amount of SnS steam, first this ash-laden gas is admitted to waste heat boiler and cools, and first SnS steam wherein changes SnS solid-state junction crystal into, and then enters surface cooler and lower the temperature further, at this moment, As
2o
3steam changes As into
2o
3solid-state junction crystal, after this, by two-stage fiber bag precipitator, dedusting is carried out to ash-laden gas, recovery obtains containing arsenic powder dirt, and (table 6 of " coming the behavior of arsenic and the research of distribution in smelting tin system; Wang Wei; popular science and technology; the 1st phase in 2012 " literary composition shows, the content of arsenic in this dust (weight percent) is only 1.4%, the dust belonging to low arsenic content can be thought), because arsenic content is lower, should return again retailoring operation containing arsenic powder dirt after granulating, tail gas then makes emission treatment.
Above-mentioned two examples are typical case of high-temperature dust-containing flue gas purification during tin is smelted.Present inventor therefrom sums up discovery, the large subject matter of high-temperature dust-containing flue gas purifying treatment ubiquity two in smelting tin at present: the first, directly cannot isolate arsenic efficiently from high-temperature dust-containing flue gas, so that recovery obtains a large amount of containing arsenic powder dirt.If these are turned back to tin containing arsenic powder dirt smelt in flow process, then arsenic can be caused to circulate in whole system accumulative, thus affect tin smelting production; If further refine arsenic by the technique such as high temperature evaporation, condensation from these high arsenic powder dirt, there is system Construction again and use cost is higher, the problem of technical process complexity.The second, the combining and configuring form that current high-temperature dust-containing flue gas purification system takes mechanical dust collector (comprising gravitational precipitator, tornado dust collector etc.) more, fiber bag precipitator adds refrigerating unit, technical process is long, equipment is more.
Summary of the invention
The present invention first to provide a kind of can high efficiency separation go out arsenic tin smelt in high-temperature dust-containing flue gas purification process and specific equipment row; The present invention its secondaryly provide a kind of and realize the calcination process technique of the Tin concentrate of the high efficiency separation of arsenic in tin roasted ore and specific equipment row; In addition, the tin that the present invention also will provide two kinds of technical process shorter smelt in high-temperature dust-containing flue gas purification system.
One, about high-temperature dust-containing flue gas purification process of the present invention and specific equipment row
High-temperature dust-containing flue gas purification process in tin smelting, described high-temperature dust-containing flue gas comes from the Industrial Stoves in tin smelting flow process, the step that this purification process comprises is: the first smoke filtration one, successively carried out described ash-laden gas and the second smoke filtration: in the first smoke filtration, temperature is in the ash-laden gas to be filtered of 460 ~ 900 DEG C by the first filtering material; In second smoke filtration, temperature is in the ash-laden gas to be filtered of 110 ~ 240 DEG C by the second filtering material; The ash-laden gas filtering accuracy of described first filtering material and the second filtering material is 0.05 ~ 1 μm, and at least the first filtering material is made up of high temperature resistant sintering inorganic porous material; Two, from the first smoke filtration, reclaim the dust obtaining high tin content; From the second smoke filtration, reclaim the dust of the high arsenic content obtained, the tail gas after the second smoke filtration enters follow-up vent gas treatment.
In high-temperature dust-containing flue gas purification process in above-mentioned tin smelting, before carrying out the first smoke filtration, first the temperature of ash-laden gas can be down to less than 580 DEG C by the first refrigerating unit and (temperature be herein set as 580 DEG C is to reduce the requirement to high-temperature behaviors such as the first filtering material anti-thermal shocks with next, two is if the first refrigerating unit is waste heat boiler, can also ensure utilization rate of waste heat) and the temperature requirement of satisfied first smoke filtration; Before carrying out the second smoke filtration, first by the second refrigerating unit, ash-laden gas temperature can be down to the requirement of satisfied second smoke filtration.Wherein, in the first refrigerating unit and the second refrigerating unit, at least the first refrigerating unit can be waste heat boiler, thus realizes the effective utilization to waste heat.
In high-temperature dust-containing flue gas purification process in above-mentioned tin smelting, also can be directly that the ash-laden gas of more than 680 DEG C carries out the first smoke filtration by temperature, then by refrigerating unit, the exhaust temperature after the first smoke filtration is down to the requirement of satisfied second smoke filtration, then the second smoke filtration is carried out to the ash-laden gas after cooling.Wherein, described refrigerating unit is preferably waste heat boiler.
In high-temperature dust-containing flue gas purification process in above-mentioned tin smelting, at least the first filtering material can be selected from existing high temperature resistant sintered ceramic porous material, high temperature resistant sintering diamond bit.The present invention to advise in described first filtering material and the second filtering material at least the first filtering material adopt heat-shock resistance better, high temperature filtration time the higher sintering FeAl base intermetallic compound porous material of reliability or sintering Fe
3al base intermetallic compound porous material.
Term " ash-laden gas filtering accuracy " be defined as can filtering by mass 98% >=particle of a certain size, the size of this particle is filtering accuracy (lower with).Such as, when the ash-laden gas filtering accuracy of the first filtering material and the second filtering material is 0.5 μm, namely show the first filtering material and the second filtering material can in filtering ash-laden gas by mass 98% the particle of size >=0.5 μm.Contriver finds, the purification of high-temperature dust-containing flue gas in smelting for tin, the ash-laden gas filtering accuracy of the first filtering material and the second filtering material is set as that 0.05 ~ 1 μm is optimal selection, because when ash-laden gas filtering accuracy being set in this interval, the while of beat all, in filtration efficiency, filtration pressure difference and filtering material regenerability, performance is excellent, namely can either ensure higher filtration efficiency, the filtration pressure difference that is suitable for and good filtering material regenerability can be guaranteed again simultaneously.On this basis, the ash-laden gas filtering accuracy of described first filtering material and the second filtering material is preferably 0.3 ~ 0.8 μm.
In high-temperature dust-containing flue gas purification process in above-mentioned tin smelting, described Industrial Stoves can comprise: tin is smelted in flow process for refining the multiple hearth furnace of front calcination process, fluidizing furnace and rotary kiln to Tin concentrate, for carrying out the reverberatory furnace of retailoring, electric arc furnace, Ausmelt furnace and Isa smelting stove to stannic oxide concentrate or Tin concentrate calcining, and any one for carrying out in the fuming furnace of sulfiding volatilization to the rich slag of the tin of retailoring operation output.
In high-temperature dust-containing flue gas purification process in above-mentioned tin smelting, described second filtering material can be formed by sintering inorganic porous material or be adopted cloth bag.
In high-temperature dust-containing flue gas purification process in above-mentioned tin smelting, preferably the temperature of ash-laden gas to be filtered is controlled below 200 DEG C in described second smoke filtration, to make As
2o
3steam fully changes As into
2o
3solid-state junction crystal.
In high-temperature dust-containing flue gas purification process in above-mentioned tin smelting, described vent gas treatment comprises desulfurization process.
The specific equipment row of above-mentioned technique, comprise the unit that gathers dust be connected with the tin Industrial Stoves smelted in flow process, the high-temperature dust-containing flue gas discharged from described Industrial Stoves is processed by this unit that gathers dust, gather dust unit end connect tail gas treating unit, the described unit that gathers dust successively comprises: the first filtrating equipment of flue gas, and it has the first filtering material that the ash-laden gas to be filtered for being in 460 ~ 900 DEG C to temperature filters; Second filtrating equipment of flue gas, it has the second filtering material that the ash-laden gas to be filtered for being in 110 ~ 240 DEG C to temperature filters; The ash-laden gas filtering accuracy of described first filtering material and the second filtering material is 0.05 ~ 1 μm, and at least the first filtering material is made up of high temperature resistant sintering inorganic porous material.
In high-temperature dust-containing flue gas treating plant row in above-mentioned tin smelting, the first refrigerating unit and the second refrigerating unit can also be comprised, described first refrigerating unit between Industrial Stoves and the first filtrating equipment of flue gas for the temperature of ash-laden gas being down to less than 580 DEG C and meeting the temperature requirement of the first smoke filtration, described second refrigerating unit between the first filtrating equipment of flue gas and the second filtrating equipment of flue gas for ash-laden gas temperature being down to the requirement of satisfied second smoke filtration; In first refrigerating unit and the second refrigerating unit, at least the first refrigerating unit is waste heat boiler.
In high-temperature dust-containing flue gas treating plant row in above-mentioned tin smelting, the temperature in of described first filtrating equipment of flue gas also can be more than 680 DEG C; The waste heat boiler for ash-laden gas temperature being down to satisfied second smoke filtration requirement is provided with between first filtrating equipment of flue gas and the second filtrating equipment of flue gas.
Described Industrial Stoves can comprise: tin is smelted in flow process for refining the multiple hearth furnace of front calcination process, fluidizing furnace and rotary kiln to Tin concentrate, for carrying out the reverberatory furnace of retailoring, electric arc furnace, Ausmelt furnace and Isa smelting stove to stannic oxide concentrate or Tin concentrate calcining, and any one for carrying out in the fuming furnace of sulfiding volatilization to the rich slag of the tin of retailoring operation output.
Smelt arsenic compound in high-temperature dust-containing flue gas based on tin and (mainly refer to As
2o
3) (mainly refer to SnO with sn-containing compound
2or SnS) difference of boiling point, when the temperature that tin smelts high-temperature dust-containing flue gas is in 460 ~ 900 DEG C, arsenic is with As
2o
3the form of steam exists, and sn-containing compound is solid-state, and at this moment, after being filtered by the first filtering material, in flue gas, stanniferous dust is substantially removed, and obtains the dust of high tin content, thus achieves the high efficiency separation of tin, arsenic; When the temperature of ash-laden gas is in 110 ~ 240 DEG C, As
2o
3steam changes As into
2o
3solid-state junction crystal, at this moment, after being filtered, can obtain the dust of high arsenic content by the second filtering material.Like this, the dust of high tin content can return tin and smelt in flow process, tin is used more effectively, and the dust of high arsenic content is discharged from tin smelting flow process, tin is avoided to smelt the circulative accumulation of arsenic in flow process, simultaneously because arsenic grade in the dust of the high arsenic content of gained is higher, be conducive to the later use (the white arsenic of recovery can directly be applied as Industrial products) of arsenic, save the recovery purifying technique that follow-up arsenic reclaims the arsenic such as high temperature evaporation, condensation process.
Two, about calcination process technique and the specific equipment row of Tin concentrate of the present invention
The calcination process technique of Tin concentrate of the present invention, this technique can realize the high efficiency separation to tin roasted ore (calcining reclaims the general name of dust with institute) middle arsenic, it step comprised is: one, carry out roasting to Tin concentrate, obtain calcining and ash-laden gas respectively, containing the As that most of arsenic in former Tin concentrate generates through oxidizing roasting in this ash-laden gas
2o
3steam; Two, the first smoke filtration successively described ash-laden gas carried out and the second smoke filtration: in the first smoke filtration, temperature is in the ash-laden gas to be filtered of 460 ~ 900 DEG C by the first filtering material; In second smoke filtration, temperature is in the ash-laden gas to be filtered of 110 ~ 240 DEG C by the second filtering material; The ash-laden gas filtering accuracy of described first filtering material and the second filtering material is 0.05 ~ 1 μm, and at least the first filtering material is made up of high temperature resistant sintering inorganic porous material; Three, return reclaim the dust obtained from the first smoke filtration to calcination steps, or as the raw material of sequential reduction melting operation together with described calcining; Discharged from tin smelting flow process by the dust reclaiming the enrichment arsenic obtained from the second smoke filtration, the tail gas after the second smoke filtration enters follow-up vent gas treatment.
In the calcination process technique of above-mentioned Tin concentrate, before carrying out the first smoke filtration, first by the first refrigerating unit, the temperature of ash-laden gas can be down to less than 580 DEG C and the temperature requirement of satisfied first smoke filtration; Before carrying out the second smoke filtration, first by the second refrigerating unit, ash-laden gas temperature can be down to the requirement of satisfied second smoke filtration.
In the calcination process technique of above-mentioned Tin concentrate, also can be directly that the ash-laden gas of more than 680 DEG C carries out the first smoke filtration by temperature, then by refrigerating unit, the exhaust temperature after the first smoke filtration is down to the requirement of satisfied second smoke filtration, then the second smoke filtration is carried out to the ash-laden gas after cooling.
In the calcination process technique of above-mentioned Tin concentrate, in described first filtering material and the second filtering material, at least the first filtering material is preferably by sintering FeAl base intermetallic compound porous material or sintering Fe
3al base intermetallic compound porous material is formed.
In the calcination process technique of above-mentioned Tin concentrate, the ash-laden gas filtering accuracy of described first filtering material and the second filtering material is all preferred at 0.3 ~ 0.8 μm.
In the calcination process technique of above-mentioned Tin concentrate, described second filtering material can be formed by sintering inorganic porous material or be adopted cloth bag.
In the calcination process technique of above-mentioned Tin concentrate, preferably the temperature of ash-laden gas to be filtered is controlled below 200 DEG C in described second smoke filtration.
In the calcination process technique of above-mentioned Tin concentrate, described vent gas treatment comprises desulfurization process.
Be exclusively used in the equipment row of the calcination process technique of above-mentioned Tin concentrate, the unit that gathers dust comprising stoving oven (comprising multiple hearth furnace, fluidizing furnace and rotary kiln for refining the Industrial Stoves of front calcination process operation to Tin concentrate) and be connected with stoving oven, containing the As that most of arsenic in former Tin concentrate generates through oxidizing roasting from the ash-laden gas that described stoving oven discharges
2o
3steam, this ash-laden gas is processed by the unit that gathers dust, the end of unit of gathering dust connects tail gas treating unit, described in the unit that gathers dust successively comprise: the first filtrating equipment of flue gas, it has the first filtering material that the ash-laden gas to be filtered for being in 460 ~ 900 DEG C to temperature filters; Second filtrating equipment of flue gas, it has the second filtering material that the ash-laden gas to be filtered for being in 110 ~ 240 DEG C to temperature filters; The ash-laden gas filtering accuracy of described first filtering material and the second filtering material is 0.05 ~ 1 μm, and at least the first filtering material is made up of high temperature resistant sintering inorganic porous material.
The first refrigerating unit and the second refrigerating unit can also be comprised in the calcination process equipment row of above-mentioned Tin concentrate, described first refrigerating unit between stoving oven and the first filtrating equipment of flue gas for the temperature of ash-laden gas being down to less than 580 DEG C and meeting the temperature requirement of the first smoke filtration, described second refrigerating unit between the first filtrating equipment of flue gas and the second filtrating equipment of flue gas for ash-laden gas temperature being down to the requirement of satisfied second smoke filtration; In first refrigerating unit and the second refrigerating unit, at least the first refrigerating unit is waste heat boiler.
In the calcination process equipment row of above-mentioned Tin concentrate, the temperature in of described first filtrating equipment of flue gas also can be more than 680 DEG C; The waste heat boiler for ash-laden gas temperature being down to satisfied second smoke filtration requirement is provided with between first filtrating equipment of flue gas and the second filtrating equipment of flue gas.
In the calcination process equipment row of above-mentioned Tin concentrate, described tail gas treating unit comprises the equipment carrying out tail gas desulfurization process.
Above-mentioned Tin concentrate calcination process technique smelts the different of arsenic compound and sn-containing compound boiling point in high-temperature dust-containing flue gas based on tin equally, and when the temperature of tin smelting high-temperature dust-containing flue gas is in 460 ~ 900 DEG C, arsenic is with As
2o
3the form of steam exists, and sn-containing compound is solid-state, and at this moment, after being filtered by the first filtering material, in flue gas, stanniferous dust is substantially removed, and obtains the dust of high tin content, and achieves the high efficiency separation of tin, arsenic; When the temperature of ash-laden gas is in 110 ~ 240 DEG C, As
2o
3steam changes As into
2o
3solid-state junction crystal, at this moment, after being filtered, can obtain the dust of high arsenic content by the second filtering material.Like this, the dust of high tin content being returned tin smelts in flow process, tin is used more effectively, and the dust of high arsenic content is discharged from tin smelting flow process, tin is avoided to smelt the circulative accumulation of arsenic in flow process, simultaneously because arsenic grade in the dust of the high arsenic content of gained is higher, can directly apply as Industrial products.
Three, the high-temperature dust-containing flue gas purification system in smelting about tin of the present invention
High-temperature dust-containing flue gas purification system in tin smelting of the present invention, comprise the unit that gathers dust of successively series connection, cooling unit and tail gas treating unit, the described unit that gathers dust is connected with the Industrial Stoves that tin is smelted in flow process, low arsenic content high-temperature dust-containing flue gas (the low arsenic content high-temperature dust-containing flue gas that the fuming furnace sulfiding volatilization mentioned in such as background technology produces) for discharging described Industrial Stoves processes, the described unit that gathers dust comprises filtrating equipment of flue gas, this filtrating equipment of flue gas directly or to be connected with Industrial Stoves by mechanical dust collector and temperature in is less than 900 DEG C, filtering material in described filtrating equipment of flue gas is made up of high temperature resistant sintering inorganic porous material, this material is 0.05 ~ 1 μm to the filtering accuracy of ash-laden gas.
In high-temperature dust-containing flue gas purification system in above-mentioned tin smelting, described filtering material is preferably by sintering FeAl base intermetallic compound porous material or sintering Fe
3al base intermetallic compound porous material is formed.
In high-temperature dust-containing flue gas purification system in above-mentioned tin smelting, the filtering accuracy of described filtering material to ash-laden gas is preferably 0.3 ~ 0.8 μm.
In high-temperature dust-containing flue gas purification system in above-mentioned tin smelting, described cooling unit is preferably waste heat boiler.
In high-temperature dust-containing flue gas purification system in above-mentioned tin smelting, described tail gas treating unit comprises the equipment carrying out tail gas desulfurization process.
Because the high-temperature dust-containing flue gas purification system in above-mentioned tin smelting only processes for the low arsenic content high-temperature dust-containing flue gas of Industrial Stoves discharge, therefore not in the link arranging special recovery arsenic in unit of gathering dust, and be only provided with one-level filtrating equipment of flue gas, therefore its technical process shortens dramatically.Certainly, the low arsenic content high-temperature dust-containing flue gas in smelting for this tin, the high-temperature dust-containing flue gas purification process during the tin provided still can be adopted above to smelt processes.
High-temperature dust-containing flue gas purification system in another kind of tin smelting of the present invention, comprise the cooling unit of successively series connection, gather dust unit and tail gas treating unit, the Industrial Stoves that the described unit that gathers dust is smelted in flow process by cooling unit and tin are connected, ash-laden gas for discharging described Industrial Stoves processes, the described unit that gathers dust comprises filtrating equipment of flue gas, this filtrating equipment of flue gas directly or to be connected with cooling unit by mechanical dust collector and temperature in is 110 ~ 240 DEG C, filtering material in described filtrating equipment of flue gas is made up of sintering inorganic porous material, this material is 0.05 ~ 1 μm to the filtering accuracy of ash-laden gas.
In high-temperature dust-containing flue gas purification system in above-mentioned tin smelting, described filtering material is preferably by sintering FeAl base intermetallic compound porous material or sintering Fe
3al base intermetallic compound porous material is formed.
In high-temperature dust-containing flue gas purification system in above-mentioned tin smelting, the filtering accuracy of described filtering material to ash-laden gas is preferably 0.3 ~ 0.8 μm.
In high-temperature dust-containing flue gas purification system in above-mentioned tin smelting, described cooling unit is preferably waste heat boiler.
In high-temperature dust-containing flue gas purification system in above-mentioned tin smelting, described tail gas treating unit comprises the equipment carrying out tail gas desulfurization process.
The technical process length of the high-temperature dust-containing flue gas purification system in above-mentioned tin smelting is substantially identical with high-temperature dust-containing flue gas purification system above, and just the position of cooling unit and filtrating equipment of flue gas is exchanged.Thus, this high-temperature dust-containing flue gas purification system has the shorter feature of technical process equally.In addition, this high-temperature dust-containing flue gas purification system can not only process the low arsenic content high-temperature dust-containing flue gas of Industrial Stoves discharge, also can process high arsenic content high-temperature dust-containing flue gas.
Below in conjunction with the drawings and specific embodiments, the present invention is described further.The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the embodiment of the present invention 1.
Fig. 2 is the process flow sheet of the embodiment of the present invention 2.
Fig. 3 is the process flow sheet of the embodiment of the present invention 3.
Fig. 4 is the process flow sheet of the embodiment of the present invention 4.
Fig. 5 be contriver find filter tin smelt high-temperature dust-containing flue gas time filtration efficiency, filtration pressure difference to the change curve of filtering accuracy, in order to show the foundation of selection material filtering accuracy of the present invention.
Fig. 6 be contriver find filtering when tin smelts high-temperature dust-containing flue gas material regeneration ability to the change curve of filtering accuracy, in order to show the foundation of selection material filtering accuracy of the present invention.
Embodiment
Embodiment 1: the boiling roaster treatment process of Tin concentrate and the purification for boiling roaster high-temperature dust-containing flue gas
As shown in Figure 1, obtain calcining and high-temperature dust-containing flue gas respectively by boiling roaster, the temperature of this ash-laden gas is roughly 800 ~ 900 DEG C, wherein containing the As that most of arsenic in former Tin concentrate generates through oxidizing roasting
2o
3steam and a large amount of stanniferous dust (are mainly SnO
2particle); First this ash-laden gas is admitted in waste heat boiler 1 and carries out cool (first can certainly carry out rough dusting process by mechanical dust collector and send into waste heat boiler 1 again), the obtained temperature that cools is that the ash-laden gas of 480 ~ 500 DEG C is admitted in the first filtrating equipment of flue gas 2 again, the first filtering material in this first filtrating equipment of flue gas 2 adopts sintering FeAl base intermetallic compound porous material, it is the highest can use in the high-temperature atmosphere of about 900 DEG C, and its ash-laden gas filtering accuracy is 0.75 μm; After the first filtrating equipment of flue gas 2 filters, in former ash-laden gas, the stanniferous dust of more than 99% is removed, thus the dust of high tin content is obtained at the bottom deposit of the first filtrating equipment of flue gas 2, the flue gas that the first filtrating equipment of flue gas 2 discharges enters the second refrigerating unit again; Second refrigerating unit both can use waste heat boiler, also can use surface cooler 3, and the ash-laden gas temperature of its discharge is 180 ~ 200 DEG C, at this moment, and the As in ash-laden gas
2o
3steam fully changes solid-state junction crystal into, and enters subsequently in the second filtrating equipment of flue gas 4 and filter; The second filtering material in second filtrating equipment of flue gas 4 adopts sintered ceramic porous material, its ash-laden gas filtering accuracy 0.5 μm, can by ash-laden gas more than 99% containing the removing of arsenic powder dirt, thus obtain the dust of high arsenic content at the bottom deposit of the second filtrating equipment of flue gas 4; The tail gas of the second filtrating equipment of flue gas 4 enters follow-up tail gas treating unit, adopts milk of lime absorption SO wherein
2or by washing extracting sulfuric acid, the residual air after process is directly discharged; The dust reclaiming the high tin content obtained from the first filtrating equipment of flue gas 2 returns calcination steps, or as the raw material of sequential reduction melting operation together with described calcining; The dust reclaiming the high arsenic content obtained from the second filtrating equipment of flue gas 4 is discharged from tin smelting flow process.
Embodiment 2: the boiling roaster treatment process of Tin concentrate and the purification for boiling roaster high-temperature dust-containing flue gas
As shown in Figure 2, obtain calcining and high-temperature dust-containing flue gas respectively by boiling roaster, the temperature of this ash-laden gas is roughly 800 ~ 900 DEG C, wherein containing the As that most of arsenic in former Tin concentrate generates through oxidizing roasting
2o
3steam and a large amount of stanniferous dust (are mainly SnO
2particle); This ash-laden gas is first directly admitted in the first filtrating equipment of flue gas 2 and (first can certainly carries out rough dusting process by mechanical dust collector and send into the first filtrating equipment of flue gas again), the first filtering material in this first filtrating equipment of flue gas 2 adopts sintering FeAl base intermetallic compound porous material, it is the highest can use in the high-temperature atmosphere of about 900 DEG C, and its ash-laden gas filtering accuracy is 0.8 μm; After the first filtrating equipment of flue gas 2 filters, in former ash-laden gas, the stanniferous dust of more than 99% is removed, thus the dust of high tin content is obtained at the bottom deposit of the first filtrating equipment of flue gas 2, the flue gas that first filtrating equipment of flue gas 2 discharges enters in waste heat boiler 5 again and cools, and the obtained temperature that cools is that the ash-laden gas of 180 ~ 200 DEG C enters in the second filtrating equipment of flue gas 4 and filters; The second filtering material in second filtrating equipment of flue gas 4 adopts cloth bag, its ash-laden gas filtering accuracy 1.0 μm, can by ash-laden gas about 97% containing the removing of arsenic powder dirt, thus obtain the dust of high arsenic content at the bottom deposit of the second filtrating equipment of flue gas 4; The tail gas of the second filtrating equipment of flue gas 4 enters follow-up tail gas treating unit, adopts milk of lime absorption SO wherein
2or by washing extracting sulfuric acid, the residual air after process is directly discharged; The dust reclaiming the high tin content obtained from the first filtrating equipment of flue gas 2 returns calcination steps, or as the raw material of sequential reduction melting operation together with described calcining; The dust reclaiming the high arsenic content obtained from the second filtrating equipment of flue gas 4 is discharged from tin smelting flow process.
By finding the contrast of embodiment 1 and embodiment 2, embodiment 2 has only been undertaken once cooling specially by waste heat boiler 5, and therefore, the technical process of embodiment 2 can be shorter compared with embodiment 1.Even more important difference be, first filtrating equipment of flue gas 2 of embodiment 1 filters the ash-laden gas that temperature is 480 ~ 500 DEG C, first filtrating equipment of flue gas 2 of embodiment 2 filters the ash-laden gas that temperature is about 800 DEG C, therefore, in fact, embodiment 2 has higher requirement to the high temperature filtration performance of the first filtering material in the first filtrating equipment of flue gas 2.Although higher to the high temperature filtration performance requriements of the first filtering material, the utilization rate of waste heat of embodiment 2 also can comparatively embodiment 1 be higher.Therefore, if the high temperature filtration performance of the first filtering material ensures to some extent, then suggestion adopts the mode of embodiment 2, reaches higher utilization rate of waste heat with shortened process; If the high temperature filtration limited capacity of the first filtering material, then suggestion adopts the mode of embodiment 1.
Fig. 5, Fig. 6 be that contriver finds, tin smelt high-temperature dust-containing flue gas filter in, filtration efficiency, filtration pressure difference and material regeneration ability are to the change curve of filtration of material precision.Wherein, material regeneration ability characterizing through ability recovery rate with material.Study above-mentioned first smoke filtration, during the mechanism of in the second smoke filtration, fluidizing furnace ash-laden gas being filtered (tin smelt in the ash-laden gas characteristic that produces of other Industrial Stoves and flue gas very similar), contriver finds: as shown in Figure 5, no matter be the first smoke filtration or the second smoke filtration, when the ash-laden gas filtering accuracy of material is 0.05 μm, filtration pressure difference is in the normal index of 0.25 ~ 0.26Mp, and when the ash-laden gas filtering accuracy of material continues to reduce, filtration pressure difference sharply increases unexpectedly, and when the ash-laden gas filtering accuracy of material increases to the process of 1.1 μm from 0.05 μm, filtration pressure difference is decreased in the better interval of 0.1 ~ 0.15Mpa gradually, for filtration efficiency, as shown in Figure 5, when the ash-laden gas filtering accuracy of material increases to 1.0 μm from 0.05 μm, the faint decline of filtration efficiency, and when ash-laden gas filtering accuracy continues to increase from 1.0 μm, filtration efficiency sharply declines suddenly, show to wear the unexpected Zeng Qiang of filter phenomenon, for through ability recovery rate, as shown in Figure 6, when the ash-laden gas filtering accuracy of material increases to 0.8 μm from 0.05 μm, through the faint decline of ability recovery rate, but remain at more than 93%, when ash-laden gas filtering accuracy continues to increase from 0.8 μm, sharply decline suddenly through ability recovery rate, drop to about 90% when ash-laden gas filtering accuracy reaches 1.0 μm.According to above-mentioned phenomenon, determine the ash-laden gas filtering accuracy of the first filtering material and the second filtering material to be set to 0.05 ~ 1 μm, but be preferably 0.3 ~ 0.8 μm.
Embodiment 3: the purification system of tin rich slag fuming furnace volatilization high-temperature dust-containing flue gas
As shown in Figure 3, purification system comprises the unit that gathers dust, cooling unit and the tail gas treating unit of successively connecting, the described unit that gathers dust is connected with fuming furnace, low arsenic content high-temperature dust-containing flue gas for discharging described fuming furnace processes, the described unit that gathers dust comprises filtrating equipment of flue gas 6, this filtrating equipment of flue gas 6 is directly connected with fuming furnace and temperature in is less than 900 DEG C, filtering material in described filtrating equipment of flue gas 6 is made up of sintering FeAl base intermetallic compound porous material, and this material is 0.5 μm to the filtering accuracy of ash-laden gas.Wherein, described cooling unit adopts waste heat boiler 7.Described tail gas treating unit comprises the equipment carrying out tail gas desulfurization process equally.
Embodiment 4: the purification system of tin rich slag fuming furnace volatilization high-temperature dust-containing flue gas
As shown in Figure 4, purification system comprise successively series connection cooling unit, gather dust unit and tail gas treating unit, the described unit that gathers dust is connected with fuming furnace by cooling unit, ash-laden gas for discharging described fuming furnace processes, the described unit that gathers dust comprises filtrating equipment of flue gas 6, this filtrating equipment of flue gas 6 is directly connected with cooling unit and temperature in is 180 ~ 200 DEG C, and the filtering material in described filtrating equipment of flue gas 6 is specifically by sintering Fe
3al base intermetallic compound porous material is formed, and this material is 0.1 μm to the filtering accuracy of ash-laden gas.Wherein, described cooling unit is waste heat boiler 7.Described tail gas treating unit comprises the equipment carrying out tail gas desulfurization process.
Claims (10)
1. the high-temperature dust-containing flue gas purification process in tin smelting, described high-temperature dust-containing flue gas comes from the Industrial Stoves in tin smelting flow process, the step that this purification process comprises is: the first smoke filtration one, successively carried out described ash-laden gas and the second smoke filtration: in the first smoke filtration, temperature is in the ash-laden gas to be filtered of 460 ~ 900 DEG C by the first filtering material; In second smoke filtration, temperature is in the ash-laden gas to be filtered of 110 ~ 240 DEG C by the second filtering material; The ash-laden gas filtering accuracy of described first filtering material and the second filtering material is 0.05 ~ 1 μm, and at least the first filtering material is made up of high temperature resistant sintering inorganic porous material; Two, from the first smoke filtration, reclaim the dust obtaining high tin content; From the second smoke filtration, reclaim the dust of the high arsenic content obtained, the tail gas after the second smoke filtration enters follow-up vent gas treatment; Be directly that the ash-laden gas of more than 680 DEG C carries out the first smoke filtration by temperature, then by refrigerating unit, the exhaust temperature after the first smoke filtration be down to the requirement of satisfied second smoke filtration, then the second smoke filtration is carried out to the ash-laden gas after cooling.
2. tin as claimed in claim 1 smelt in high-temperature dust-containing flue gas purification process, it is characterized in that: in described first filtering material and the second filtering material, at least the first filtering material is by sintering FeAl base intermetallic compound porous material or sintering Fe
3al base intermetallic compound porous material is formed.
3. the high-temperature dust-containing flue gas purification process in tin smelting as claimed in claim 1, is characterized in that: the ash-laden gas filtering accuracy of described first filtering material and the second filtering material is 0.3 ~ 0.8 μm.
4. the high-temperature dust-containing flue gas purification process in tin smelting as claimed in claim 1, is characterized in that: described second filtering material forms by sintering inorganic porous material or adopts cloth bag.
5. the high-temperature dust-containing flue gas purification process in tin smelting as claimed in claim 1, is characterized in that: in described second smoke filtration, the temperature of ash-laden gas to be filtered controlled below 200 DEG C.
6. tin as claimed in claim 1 smelt in high-temperature dust-containing flue gas purification process, it is characterized in that, described Industrial Stoves comprise: tin smelt for refining in the multiple hearth furnace of front calcination process, fluidizing furnace and rotary kiln to Tin concentrate in flow process any one; Or for stannic oxide concentrate or Tin concentrate calcining are carried out to retailoring reverberatory furnace, electric arc furnace, Ausmelt furnace and Isa smelting stove in any one; Or for carrying out the fuming furnace of sulfiding volatilization to the rich slag of the tin of retailoring operation output.
7. the high-temperature dust-containing flue gas purification process in tin smelting as claimed in claim 1, is characterized in that: described vent gas treatment comprises desulfurization process.
8. the high-temperature dust-containing flue gas treating plant row in tin smelting, comprise the unit that gathers dust be connected with the tin Industrial Stoves smelted in flow process, the high-temperature dust-containing flue gas discharged from described Industrial Stoves is processed by this unit that gathers dust, gather dust unit end connect tail gas treating unit, it is characterized in that, the described unit that gathers dust successively comprises: the first filtrating equipment of flue gas (2), and it has the first filtering material that the ash-laden gas to be filtered for being in 460 ~ 900 DEG C to temperature filters; Second filtrating equipment of flue gas (4), it has the second filtering material that the ash-laden gas to be filtered for being in 110 ~ 240 DEG C to temperature filters; The ash-laden gas filtering accuracy of described first filtering material and the second filtering material is 0.05 ~ 1 μm, and at least the first filtering material is made up of high temperature resistant sintering inorganic porous material; The temperature in of described first filtrating equipment of flue gas (2) is more than 680 DEG C; The waste heat boiler for ash-laden gas temperature being down to satisfied second smoke filtration requirement is provided with between first filtrating equipment of flue gas (2) and the second filtrating equipment of flue gas (4).
9. tin as claimed in claim 8 smelt in high-temperature dust-containing flue gas treating plant row, it is characterized in that, described Industrial Stoves comprise: tin smelt for refining in the multiple hearth furnace of front calcination process, fluidizing furnace and rotary kiln to Tin concentrate in flow process any one; Or for stannic oxide concentrate or Tin concentrate calcining are carried out to retailoring reverberatory furnace, electric arc furnace, Ausmelt furnace and Isa smelting stove in any one; Or for carrying out the fuming furnace of sulfiding volatilization to the rich slag of the tin of retailoring operation output.
10. the high-temperature dust-containing flue gas treating plant row in tin smelting as claimed in claim 8, is characterized in that: described tail gas treating unit comprises the equipment carrying out tail gas desulfurization process.
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| CN201310156636.0A CN103266229B (en) | 2013-04-29 | 2013-04-29 | Purifying process for high temperature ash-laden gas produced in tin smelting and special equipment column |
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| CN104099481B (en) * | 2013-04-29 | 2015-12-09 | 成都易态科技有限公司 | High-temperature dust-containing flue gas purification process in tin smelting and specific equipment row |
| CN103589869A (en) * | 2013-11-27 | 2014-02-19 | 郴州市金贵银业股份有限公司 | Method for selectively separating arsenic trioxide from non-ferrous metal smelter off-gas |
| CN105381665A (en) * | 2015-11-09 | 2016-03-09 | 红河绿地环保科技发展有限公司 | High temperature classification filtration treating method for smelting dust |
| CN106929692B (en) * | 2016-12-14 | 2018-11-06 | 衡阳旺发锡业有限公司 | A kind of energy-efficient tin metallurgy equipment and its application process on the double molten tin inclined-planes of band |
| CN107008912A (en) * | 2017-04-28 | 2017-08-04 | 江苏威拉里新材料科技有限公司 | A kind of gas purge system for smelting furnace |
| CN112742131A (en) * | 2020-12-31 | 2021-05-04 | 成都易态科技有限公司 | Treatment system and treatment method for flue gas generated in copper matte preparation by pyrogenic process |
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| CN104099481B (en) * | 2013-04-29 | 2015-12-09 | 成都易态科技有限公司 | High-temperature dust-containing flue gas purification process in tin smelting and specific equipment row |
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| CN103266229B (en) | 2014-10-15 |
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