CN108793244A - The method that the double section calcined by rotary kiln of metatitanic acid prepare titanium dioxide - Google Patents
The method that the double section calcined by rotary kiln of metatitanic acid prepare titanium dioxide Download PDFInfo
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- CN108793244A CN108793244A CN201810790469.8A CN201810790469A CN108793244A CN 108793244 A CN108793244 A CN 108793244A CN 201810790469 A CN201810790469 A CN 201810790469A CN 108793244 A CN108793244 A CN 108793244A
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- rotary kiln
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- metatitanic acid
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/08—Drying; Calcining ; After treatment of titanium oxide
Abstract
The invention discloses the methods that a kind of double section calcined by rotary kiln of metatitanic acid prepare titanium dioxide, include the following steps：Metatitanic acid after press filtration is dehydrated in one section of calcined by rotary kiln successively, two sections of calcined by rotary kiln obtain falling kiln product after carrying out desulfurization, transformation of crystal, grain growth, fall that kiln product are ground again, mixed powder, obtain titanium dioxide, wherein, the heat source of two sections of calcined by rotary kiln comes from the high-temperature gas that natural gas calcining generates, the heat source of one section of calcined by rotary kiln comes from the kiln tail tail gas of two sections of calcined by rotary kiln generation, and the kiln tail tail gas that one section of calcined by rotary kiln generates passes sequentially through dust chamber, bagroom recycling kiln tail dust.The present invention improves the quality of titanium dioxide, improves the calcined by rotary kiln rate of recovery, and the rate of recovery is up to 99.8%, and natural gas energy consumption reduces 30~45%, has saved the usage amount of natural gas.
Description
Technical field
The present invention relates to titanium white production and waste gas pollution control and treatment field, prepared by the double section calcined by rotary kiln of specifically a kind of metatitanic acid
The method of titanium dioxide.
Background technology
It is to determine titanium dioxide three most critical works of quality that most domestic titanium powder plant, which uses Production By Sulfuric Acid Process, calcining, at present
One of sequence.In the prior art using the drying (dehydration, desulfurization) of single hop rotary kiln completion metatitanic acid, crystal transformation, grain growth
Three operation stages and processing calcining tail gas, have the following problems：1, single hop calcined by rotary kiln metatitanic acid technique is one essence
Thin control system, kiln tail metatitanic acid inlet amount is bigger, and kiln tail volume of material is bigger, and kiln tail exhaust space is smaller, is dehydrated generation
Vapor is bigger, and kiln end temperature is lower, and the titanium dioxide quality for calcining out is poorer.To ensure kiln end temperature so that the inclined titanium of kiln hood
Sour inlet amount is limited.2, metatitanic acid material viscosity is big after press filtration, can only be crushed relatively large (grain size=5~15cm),
Helical feed can be passed through to rotary kiln.Due to entering the material cause not of uniform size of rotary kiln, effect is calcined in rotary kiln
It is different, thus calcine out to fall kiln product granular size difference larger, final titanium dioxide quality index fluctuation is larger.3, due into
Expect uneven so that the weight that material advances in kiln and speed are inconsistent, also unbalanced with the heat exchange of high-temperature gas, performance
In kiln hood medium temperature always as the rotation of rotary kiln is constantly fluctuated, the temperature difference is up to more than ten degrees Celsius, causes product quality wave
It is dynamic larger.4, kiln tail exhaust temperature is up to 350~450 DEG C, accounts for the kiln tail tail gas heat quantity quilt of calcination process heating load 45~55%
Waste.Since kiln tail exhaust temperature is excessively high, should not use bag collection, can only with a large amount of clear water, buck spraying cooling, sulphur removal and
The titanium dioxide dust in tail gas is captured, since the titanium dioxide Returning process of spray recycling can influence product quality, can only be regarded useless
Water neutralisation treatment, therefore the rate of recovery is low.
Due to metatitanic acid calcined by rotary kiln, by product quality, treating tail gas, the multiple limitation such as fuel energy consumption, therefore turn round
The production capacity of kiln is greatly restricted.How rotary kiln yield and product quality to be cracked, treating tail gas, the contradiction between fuel energy consumption,
So that rotary kiln yield rises, product quality is promoted, and treating tail gas effect is more preferable, and fuel energy consumption is lower, and has high-recovery, at
For titanium white production and one of the important topic in waste gas pollution control and treatment field.
The Chinese invention patent of Publication No. CN103183380A discloses titanium dioxide calcination rotary kiln feed process and sets
It is standby.This method is to be contacted into the metatitanic acid material of flash dryer with the high-temperature flue gas from rotary kiln exhaust gas, in bottom rotation
Under the high speed rotation effect of rotating vane piece, material is broken, disperses, dry through dissipate be evaporated it is dry after, object of the water content in 10-15%
Material enters rotary kiln.To flash dryer, cylinder serves as a contrast two layers of corundum-mullite refractory brick again by carbon steel line with rubber to be prevented the program
Corruption processing.Used rotating vane material uses Hastelloy.Rotary kiln exhaust gas in the program contains SO3、SO2Deng corrosion
Property gas, therefore the safety standards such as anti-corrosion, the leakproof of device systems height requires the material of equipment tight in mass producing
The maintenance requirement of lattice, equipment is also high.In addition, flash dryer, is down to 10- by metatitanic acid material moisture content content within a very short time
15%, but rotary kiln exhaust gas temperature is up to 350-450 DEG C, is more than the temperature for being detached from metatitanic acid combination water, in actual production not
Free moisture content is only sloughed, part can be also sloughed and combine water, causes dewatered metatitanic acid to be easy knot hard blocking.Again by high speed rotation
Blade is broken, disperses, and generation enters rotary kiln compared with the hard bulk metatitanic acid of brief summary, it is easy to titanium white powder sintering be caused to be hardened.
The Chinese invention patent of Publication No. CN104567443B discloses calcination rotary kiln tail gas heat quantity recycling cycle profit
Use method.The device includes calcination rotary kiln, cool air hose, wind turbine and heat exchanger；The calcination rotary kiln has offgas outlet
And air inlet；By the calcination rotary kiln tail gas heat quantity retracting device, the heat in calcination rotary kiln tail gas is passed through into heat exchange
Device heats gravity type heat pipe；Then enter the cold air of calcination rotary kiln by gravity type heat pipe heating；To realize to calcining
The recycling of heat, plays a role in energy saving in rotary kiln exhaust gas.This programme uses heat exchange principle, can only
Rotary kiln tail gas partial heat is recycled, utilization rate is not high.In addition, in titanium white production metatitanic acid calcine when exhaust gas temperature
Height, moisture content are larger, there is acid mist and oxysulfide, titanium dioxide dust, vapor, incoagulable gas etc., used heat exchanger
Material capability requires relatively high, it is necessary to high temperature resistant acidic material, simultaneously because metatitanic acid calcining tail gas contains part titanium dioxide powder
Dirt and vapor, in heat exchanging process, it is difficult to exempt from local steam-laden occur condensed water occur, it is viscous with titanium dioxide dust
Together, it is easy to block pipeline, cause system that can not run.Meanwhile the cleaning maintenance work of equipment is also more difficult.
In view of to defect existing for metatitanic acid calcine technology and treating tail gas, leading to calcined by rotary kiln yield and quality at present
It can not take into account, calcining tail gas heat quantity largely wastes, and the problems such as treating tail gas difficulty is big is improving metatitanic acid calcined by rotary kiln technique
The improvement that calcining tail gas is carried out in flow is very necessary.
Invention content
It is an object of the invention to solve at least the above, and provide the advantages of at least will be described later.
It is a still further object of the present invention to provide the methods that a kind of double section calcined by rotary kiln of metatitanic acid prepare titanium dioxide, carry
It having risen the quality of titanium dioxide, has improved the calcined by rotary kiln rate of recovery, the rate of recovery is up to 99.8%, and natural gas energy consumption reduces 30~
45%, save the usage amount of natural gas.
In order to realize these purposes and other advantages according to the present invention, a kind of double section calcined by rotary kiln of metatitanic acid are provided
The method for preparing titanium dioxide, includes the following steps：Metatitanic acid after press filtration is dehydrated in one section of calcined by rotary kiln successively, two
Section calcined by rotary kiln carries out desulfurization, transformation of crystal, obtains falling kiln product after grain growth, falls that kiln product are ground again, mixed powder, obtains titanium
White powder, wherein the heat source of two sections of calcined by rotary kiln comes from the high-temperature gas that natural gas calcining generates, one section of calcined by rotary kiln
Heat source comes from the kiln tail tail gas of two sections of calcined by rotary kiln generation, and the kiln tail tail gas that one section of calcined by rotary kiln generates passes sequentially through receipts
Dirt room, bagroom recycle kiln tail dust.
Preferably, press filtration is carried out using diaphragm filter press, and feed pressure control is 0.8~1.0mpa, squeeze pressure
Control is 1.2~1.4mpa.
Preferably, the metatitanic acid water content after press filtration is 45%~55%, the dewatered inclined titanium of one section of calcined by rotary kiln
The water content of acid is 0, and grain size is less than or equal to 1cm.
Preferably, the kiln tail exhaust temperature control that one section of calcined by rotary kiln generates is at 130~180 DEG C, two sections of rotary kilns
The kiln tail exhaust temperature that calcining generates is controlled at 350~450 DEG C.
Preferably, the heat source of two sections of calcined by rotary kiln is natural gas.
Preferably, it is fed intake by belt scale uniform feeding, belt scale before two sections of calcined by rotary kiln desulfurization
Range is measured within ± 0.3t/h.
Preferably, the kiln hood medium temperature of two sections of rotary kilns is 800~950 DEG C, and the fluctuation model of kiln hood medium temperature
It is trapped among within ± 3 DEG C.
Preferably, the kiln tail tail gas that one section of calcined by rotary kiln generates passes sequentially through dust chamber, bagroom recycling kiln
After tail dust, then discharged after passing sequentially through clear water spray, buck spray, electric demisting processing.
Preferably, the calcining rate of recovery >=99.8% of double sections of rotary kilns.
Preferably, value >=98.4 L of titanium dioxide obtained, reducing power >=103%, dispersibility >=80%.
The present invention includes at least following advantageous effect：
The present invention effectively controls temperature when metatitanic acid dehydration so that metatitanic acid is equal by the setting of double sections of rotary kilns
Even dehydration avoids caking at high temperature, and dewatered metatitanic acid epigranular, dehydration degree is uniform, is accurately thrown conducive to belt scale
Material；Meanwhile the present invention effectively control the kiln hood of one section of rotary kiln and two sections of rotary kilns, kiln tail temperature, compared to existing skill
Single hop rotary kiln technology in art increases partially too sour inlet amount, and too sour inlet amount partially is the 1.65-2.25 of the prior art
Times, the part titanium dioxide dust carried in the kiln tail tail gas of one section of rotary kiln has effectively been recycled, the calcined by rotary kiln rate of recovery is improved,
The rate of recovery is up to 99.8%.And whiteness i.e. value >=98.4 L of titanium dioxide prepared by the present invention, reducing power >=103%, dispersibility >=
80%.
The kiln tail tail gas that the present invention generates two sections of calcined by rotary kiln is as the heat source of one section of calcined by rotary kiln, with existing skill
The single hop rotary kiln whole process of art is compared using natural gas as heat source, and natural gas energy consumption of the invention reduces 30~45%, is saved
The usage amount of natural gas takes full advantage of the kiln tail tail gas of two sections of calcined by rotary kiln generation, meets Green Sustainable reason
It reads.
Part is illustrated to embody by further advantage, target and the feature of the present invention by following, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Description of the drawings
Fig. 1 is the flow diagram of the present invention.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples, to enable those skilled in the art's reference
Specification word can be implemented according to this.
As shown in Figure 1, the present invention provides the methods that a kind of double section calcined by rotary kiln of metatitanic acid prepare titanium dioxide, including with
Lower step：Metatitanic acid after press filtration is dehydrated in one section of calcined by rotary kiln successively, two sections of calcined by rotary kiln carry out desulfurization, crystalline substance
Type conversion obtains falling kiln product after grain growth, falls that kiln product are ground again, mixed powder, obtains titanium dioxide, wherein two sections of rotary kilns are forged
The heat source of burning comes from the high-temperature gas that natural gas calcining generates, and the heat source of one section of calcined by rotary kiln comes from two sections of rotary kilns and forges
The kiln tail tail gas generated is burnt, the kiln tail tail gas that one section of calcined by rotary kiln generates passes sequentially through dust chamber, bagroom recycling kiln
Tail dust.
<Embodiment 1>
A kind of method that the double section calcined by rotary kiln of metatitanic acid prepare titanium dioxide, specifically includes following steps：
(1) metatitanic acid press filtration：Metatitanic acid after salt treatment is subjected to press filtration with diaphragm filter press, feed pressure is
0.83mpa, squeeze pressure 1.20mpa, pressurize 10 minutes, the metatitanic acid water content after press filtration are 53%.
(2) one sections of calcined by rotary kiln：Metatitanic acid after press filtration enters one section of revolution through breaing up crusher machine, by feed auger
Kiln calcined dehydration, the heat source of one section of calcined by rotary kiln come from the kiln tail tail gas of two sections of calcined by rotary kiln generation, one section of rotary kiln
Temperature of kiln head is 360 DEG C, and kiln end temperature is 140 DEG C.The length of one section of rotary kiln is 28m, a diameter of 2.6m.One section of rotary kiln
The inlet amount (in terms of titanium dioxide) of metatitanic acid is 4.7t/h, is single hop rotary kiln (a diameter of 2.8m, long 55m) in the prior art
The water content of 1.68 times of inlet amount 2.8t/h, dewatered metatitanic acid is 0, grain size≤1cm.
(3) two sections of calcined by rotary kiln：Dewatered metatitanic acid is stored in storage warehouse, through helical feed to two sections of rotary kilns
Feeding chamber, then by belt scale into two sections of rotary kilns uniform feeding, inventory (in terms of titanium dioxide) be 4.7 ±
0.2t/h, then generated after feed auger enters two sections of calcined by rotary kiln desulfurization, transformation of crystal, grain growths and fall kiln product.Two sections
The length of rotary kiln is 55m, a diameter of 2.8m.The heat source of two sections of calcined by rotary kiln is natural gas, and when combustion of natural gas generates
CO2, the high-temperature gases such as vapor carry a large amount of heat and flowed in two sections of rotary kilns, referred to as kiln hood medium, kiln hood medium
Temperature is controlled at 850 DEG C ± 2 DEG C.Natural gas unit consumption is 155m3/ t, than in the prior art (natural gas when single hop calcined by rotary kiln
Unit consumption 230m3/ t) decline 32.6%.
(4) it grinds, mixed powder, packaging：It after falling the cooling of kiln product, is ground through Raymond mill, mixes powder, packed to get titanium dioxide, titanium white
The L values of powder are 98.6, reducing power 105%, and dispersibility is 84%.
Prepare the combustion tail gas processing during titanium dioxide：The kiln tail tail gas that one section of calcined by rotary kiln generates passes sequentially through
Dust chamber, bagroom recycle kiln tail dust, the rate of recovery of double sections of rotary kilns (one section of rotary kiln and two sections of rotary kilns) calcining
It is 99.8%, the exhaust temperature after bag collection is reduced to 120 DEG C, then is sprayed through a clear water, and temperature is reduced to 42 DEG C, using
Secondary buck spray, electric demisting, qualified discharge.Rotary kiln exhaust gas discharge standard is：SO2≤550mg/m3；Sulfuric acid mist≤45mg/
m3；Dust≤200mg/m3。
<Embodiment 2>
A kind of method that the double section calcined by rotary kiln of metatitanic acid prepare titanium dioxide, specifically includes following steps：
(1) metatitanic acid press filtration：Metatitanic acid after salt treatment is subjected to press filtration with diaphragm filter press, feed pressure is
0.83mpa, squeeze pressure 1.23mpa, pressurize 10 minutes, the metatitanic acid water content after press filtration are 52%.
(2) one sections of calcined by rotary kiln：Metatitanic acid after press filtration enters one section of revolution through breaing up crusher machine, by feed auger
Kiln calcined dehydration, the heat source of one section of calcined by rotary kiln come from the kiln tail tail gas of two sections of calcined by rotary kiln generation, one section of rotary kiln
Temperature of kiln head is 380 DEG C, and kiln end temperature is 150 DEG C.The length of one section of rotary kiln is 28m, a diameter of 2.6m.One section of rotary kiln
The inlet amount (in terms of titanium dioxide) of metatitanic acid is 5.1t/h, is single hop rotary kiln (a diameter of 2.8m, long 55m) in the prior art
The water content of 1.82 times of inlet amount 2.8t/h, dewatered metatitanic acid is 0, grain size≤1cm.
(3) two sections of calcined by rotary kiln：Dewatered metatitanic acid is stored in storage warehouse, through helical feed to two sections of rotary kilns
Feeding chamber, then by belt scale into two sections of rotary kilns uniform feeding, inventory (in terms of titanium dioxide) be 5.1 ±
0.2t/h, then generated after feed auger enters two sections of calcined by rotary kiln desulfurization, transformation of crystal, grain growths and fall kiln product.Two sections
The length of rotary kiln is 55m, a diameter of 2.8m.The heat source of two sections of calcined by rotary kiln is natural gas, and when combustion of natural gas generates
CO2, the high-temperature gases such as vapor carry a large amount of heat and flowed in two sections of rotary kilns, referred to as kiln hood medium, kiln hood medium
Temperature is controlled at 870 DEG C ± 2 DEG C.Natural gas unit consumption is 150m3/ t, than in the prior art (natural gas when single hop calcined by rotary kiln
Unit consumption 230m3/ t) decline 34.8%.
(4) it grinds, mixed powder, packaging：It after falling the cooling of kiln product, is ground through Raymond mill, mixes powder, packed to get titanium dioxide, titanium white
The L values of powder are 98.5, reducing power 104%, and dispersibility is 83%.
Prepare the combustion tail gas processing during titanium dioxide：The kiln tail tail gas that one section of calcined by rotary kiln generates passes sequentially through
Dust chamber, bagroom recycle kiln tail dust, the rate of recovery of double sections of rotary kilns (one section of rotary kiln and two sections of rotary kilns) calcining
It is 99.8%, the exhaust temperature after bag collection is reduced to 140 DEG C, then is sprayed through a clear water, and temperature is reduced to 44 DEG C, using
Secondary buck spray, electric demisting, qualified discharge.Rotary kiln exhaust gas discharge standard is：SO2≤550mg/m3；Sulfuric acid mist≤45mg/
m3；Dust≤200mg/m3。
<Embodiment 3>
A kind of method that the double section calcined by rotary kiln of metatitanic acid prepare titanium dioxide, specifically includes following steps：
(1) metatitanic acid press filtration：Metatitanic acid after salt treatment is subjected to press filtration with diaphragm filter press, feed pressure is
0.88mpa, squeeze pressure 1.25mpa, pressurize 10 minutes, the metatitanic acid water content after press filtration are 50%.
(2) one sections of calcined by rotary kiln：Metatitanic acid after press filtration enters one section of revolution through breaing up crusher machine, by feed auger
Kiln calcined dehydration, the heat source of one section of calcined by rotary kiln come from the kiln tail tail gas of two sections of calcined by rotary kiln generation, one section of rotary kiln
Temperature of kiln head is 400 DEG C, and kiln end temperature is 160 DEG C.The length of one section of rotary kiln is 28m, a diameter of 2.6m.One section of rotary kiln
The inlet amount (in terms of titanium dioxide) of metatitanic acid is 5.5t/h, is single hop rotary kiln (a diameter of 2.8m, long 55m) in the prior art
The water content of 1.96 times of inlet amount 2.8t/h, dewatered metatitanic acid is 0, grain size≤1cm.
(3) two sections of calcined by rotary kiln：Dewatered metatitanic acid is stored in storage warehouse, through helical feed to two sections of rotary kilns
Feeding chamber, then by belt scale into two sections of rotary kilns uniform feeding, inventory (in terms of titanium dioxide) be 5.5 ±
0.2t/h, then generated after feed auger enters two sections of calcined by rotary kiln desulfurization, transformation of crystal, grain growths and fall kiln product.Two sections
The length of rotary kiln is 55m, a diameter of 2.8m.The heat source of two sections of calcined by rotary kiln is natural gas, and when combustion of natural gas generates
CO2, the high-temperature gases such as vapor carry a large amount of heat and flowed in two sections of rotary kilns, referred to as kiln hood medium, kiln hood medium
Temperature is controlled at 890 DEG C ± 2 DEG C.Natural gas unit consumption is 145m3/ t, than in the prior art (natural gas when single hop calcined by rotary kiln
Unit consumption 230m3/ t) decline 37%.
(4) it grinds, mixed powder, packaging：It after falling the cooling of kiln product, is ground through Raymond mill, mixes powder, packed to get titanium dioxide, titanium white
The L values of powder are 98.5, reducing power 104%, and dispersibility is 82%.
Prepare the combustion tail gas processing during titanium dioxide：The kiln tail tail gas that one section of calcined by rotary kiln generates passes sequentially through
Dust chamber, bagroom recycle kiln tail dust, the rate of recovery of double sections of rotary kilns (one section of rotary kiln and two sections of rotary kilns) calcining
It is 99.8%, the exhaust temperature after bag collection is reduced to 150 DEG C, then is sprayed through a clear water, and temperature is reduced to 46 DEG C, using
Secondary buck spray, electric demisting, qualified discharge.Rotary kiln exhaust gas discharge standard is：SO2≤550mg/m3；Sulfuric acid mist≤45mg/
m3；Dust≤200mg/m3。
<Embodiment 4>
A kind of method that the double section calcined by rotary kiln of metatitanic acid prepare titanium dioxide, specifically includes following steps：
(1) metatitanic acid press filtration：Metatitanic acid after salt treatment is subjected to press filtration with diaphragm filter press, feed pressure is
0.9mpa, squeeze pressure 1.30mpa, pressurize 10 minutes, the metatitanic acid water content after press filtration are 48%.
(2) one sections of calcined by rotary kiln：Metatitanic acid after press filtration enters one section of revolution through breaing up crusher machine, by feed auger
Kiln calcined dehydration, the heat source of one section of calcined by rotary kiln come from the kiln tail tail gas of two sections of calcined by rotary kiln generation, one section of rotary kiln
Temperature of kiln head is 420 DEG C, and kiln end temperature is 170 DEG C.The length of one section of rotary kiln is 28m, a diameter of 2.6m.One section of rotary kiln
The inlet amount (in terms of titanium dioxide) of metatitanic acid is 6.0t/h, is single hop rotary kiln (a diameter of 2.8m, long 55m) in the prior art
The water content of 2.14 times of inlet amount 2.8t/h, dewatered metatitanic acid is 0, grain size≤1cm.
(3) two sections of calcined by rotary kiln：Dewatered metatitanic acid is stored in storage warehouse, through helical feed to two sections of rotary kilns
Feeding chamber, then by belt scale into two sections of rotary kilns uniform feeding, inventory (in terms of titanium dioxide) be 6.0 ±
0.3t/h, then generated after feed auger enters two sections of calcined by rotary kiln desulfurization, transformation of crystal, grain growths and fall kiln product.Two sections
The length of rotary kiln is 55m, a diameter of 2.8m.The heat source of two sections of calcined by rotary kiln is natural gas, and when combustion of natural gas generates
CO2, the high-temperature gases such as vapor carry a large amount of heat and flowed in two sections of rotary kilns, referred to as kiln hood medium, kiln hood medium
Temperature is controlled at 910 DEG C ± 3 DEG C.Natural gas unit consumption is 140m3/ t, than in the prior art (natural gas when single hop calcined by rotary kiln
Unit consumption 230m3/ t) decline 39.1%.
(4) it grinds, mixed powder, packaging：It after falling the cooling of kiln product, is ground through Raymond mill, mixes powder, packed to get titanium dioxide, titanium white
The L values of powder are 98.4, reducing power 103%, and dispersibility is 81%.
Prepare the combustion tail gas processing during titanium dioxide：The kiln tail tail gas that one section of calcined by rotary kiln generates passes sequentially through
Dust chamber, bagroom recycle kiln tail dust, the rate of recovery of double sections of rotary kilns (one section of rotary kiln and two sections of rotary kilns) calcining
It is 99.8%, the exhaust temperature after bag collection is reduced to 160 DEG C, then is sprayed through a clear water, and temperature is reduced to 48 DEG C, using
Secondary buck spray, electric demisting, qualified discharge.Rotary kiln exhaust gas discharge standard is：SO2≤550mg/m3；Sulfuric acid mist≤45mg/
m3；Dust≤200mg/m3。
<Embodiment 5>
A kind of method that the double section calcined by rotary kiln of metatitanic acid prepare titanium dioxide, specifically includes following steps：
(1) metatitanic acid press filtration：Metatitanic acid after salt treatment is subjected to press filtration with diaphragm filter press, feed pressure is
0.92mpa, squeeze pressure 1.35mpa, pressurize 10 minutes, the metatitanic acid water content after press filtration are 46%.
(2) one sections of calcined by rotary kiln：Metatitanic acid after press filtration enters one section of revolution through breaing up crusher machine, by feed auger
Kiln calcined dehydration, the heat source of one section of calcined by rotary kiln come from the kiln tail tail gas of two sections of calcined by rotary kiln generation, one section of rotary kiln
Temperature of kiln head is 440 DEG C, and kiln end temperature is 180 DEG C.The length of one section of rotary kiln is 28m, a diameter of 2.6m.One section of rotary kiln
The inlet amount (in terms of titanium dioxide) of metatitanic acid is 6.3t/h, is single hop rotary kiln (a diameter of 2.8m, long 55m) in the prior art
The water content of 2.25 times of inlet amount 2.8t/h, dewatered metatitanic acid is 0, grain size≤1cm.
(3) two sections of calcined by rotary kiln：Dewatered metatitanic acid is stored in storage warehouse, through helical feed to two sections of rotary kilns
Feeding chamber, then by belt scale into two sections of rotary kilns uniform feeding, inventory (in terms of titanium dioxide) be 6.3 ±
0.3t/h, then generated after feed auger enters two sections of calcined by rotary kiln desulfurization, transformation of crystal, grain growths and fall kiln product.Two sections
The length of rotary kiln is 55m, a diameter of 2.8m.The heat source of two sections of calcined by rotary kiln is natural gas, and when combustion of natural gas generates
CO2, the high-temperature gases such as vapor carry a large amount of heat and flowed in two sections of rotary kilns, referred to as kiln hood medium, kiln hood medium
Temperature is controlled at 930 DEG C ± 3 DEG C.Natural gas unit consumption is 135m3/ t, than in the prior art (natural gas when single hop calcined by rotary kiln
Unit consumption 230m3/ t) decline 41.3%.
(4) it grinds, mixed powder, packaging：It after falling the cooling of kiln product, is ground through Raymond mill, mixes powder, packed to get titanium dioxide, titanium white
The L values of powder are 98.5, reducing power 103%, and dispersibility is 82%.
Prepare the combustion tail gas processing during titanium dioxide：The kiln tail tail gas that one section of calcined by rotary kiln generates passes sequentially through
Dust chamber, bagroom recycle kiln tail dust, the rate of recovery of double sections of rotary kilns (one section of rotary kiln and two sections of rotary kilns) calcining
It is 99.8%, the exhaust temperature after bag collection is reduced to 170 DEG C, then is sprayed through a clear water, and temperature is reduced to 50 DEG C, using
Secondary buck spray, electric demisting, qualified discharge.Rotary kiln exhaust gas discharge standard is：SO2≤550mg/m3；Sulfuric acid mist≤45mg/
m3；Dust≤200mg/m3。
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details.
Claims (10)
1. the method that the double section calcined by rotary kiln of metatitanic acid prepare titanium dioxide, which is characterized in that include the following steps：After press filtration
Metatitanic acid is dehydrated in one section of calcined by rotary kiln successively, after two sections of calcined by rotary kiln carry out desulfurization, transformation of crystal, grain growth
It obtains falling kiln product, falls that kiln product are ground again, mixed powder, obtain titanium dioxide, wherein the heat source of two sections of calcined by rotary kiln comes from naturally
The high-temperature gas that gas calcining generates, the heat source of one section of calcined by rotary kiln come from the kiln tail tail gas of two sections of calcined by rotary kiln generation,
The kiln tail tail gas that one section of calcined by rotary kiln generates passes sequentially through dust chamber, bagroom recycling kiln tail dust.
2. the method that the double section calcined by rotary kiln of metatitanic acid as described in claim 1 prepare titanium dioxide, which is characterized in that press filtration is adopted
It is carried out with diaphragm filter press, feed pressure control is 0.8~1.0mpa, and squeeze pressure control is 1.2~1.4mpa.
3. the method that the double section calcined by rotary kiln of metatitanic acid as described in claim 1 prepare titanium dioxide, which is characterized in that after press filtration
Metatitanic acid water content be 45%~55%, the water content of one section of dewatered metatitanic acid of calcined by rotary kiln is 0, grain size be less than or
Equal to 1cm.
4. the method that the double section calcined by rotary kiln of metatitanic acid as described in claim 1 prepare titanium dioxide, which is characterized in that one section is returned
The kiln tail exhaust temperature control that rotary kiln calcining generates is at 130~180 DEG C, kiln tail exhaust temperature control that two sections of calcined by rotary kiln generate
System is at 350~450 DEG C.
5. the method that the double section calcined by rotary kiln of metatitanic acid as described in claim 1 prepare titanium dioxide, which is characterized in that two sections are returned
The heat source of rotary kiln calcining is natural gas.
6. the method that the double section calcined by rotary kiln of metatitanic acid as described in claim 1 prepare titanium dioxide, which is characterized in that two sections are returned
Rotary kiln is calcined before desulfurization through belt scale uniform feeding, the inventory fluctuation range of belt scale ± 0.3t/h with
It is interior.
7. the method that the double section calcined by rotary kiln of metatitanic acid as described in claim 1 prepare titanium dioxide, which is characterized in that two sections are returned
The kiln hood medium temperature of rotary kiln is 800~950 DEG C, and the fluctuation range of kiln hood medium temperature is within ± 3 DEG C.
8. the method that the double section calcined by rotary kiln of metatitanic acid as described in claim 1 prepare titanium dioxide, which is characterized in that one section is returned
After the kiln tail tail gas that rotary kiln calcining generates passes sequentially through dust chamber, bagroom recycling kiln tail dust, then pass sequentially through clear water
It is discharged after spray, buck spray, electric demisting processing.
9. the method that the double section calcined by rotary kiln of metatitanic acid as described in claim 1 prepare titanium dioxide, which is characterized in that double sections are returned
The calcining rate of recovery >=99.8% of rotary kiln.
10. the method that the double section calcined by rotary kiln of metatitanic acid as described in claim 1 prepare titanium dioxide, which is characterized in that be made
Titanium dioxide value >=98.4 L, reducing power >=103%, dispersibility >=80%.
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| CN111664716A (en) * | 2020-04-10 | 2020-09-15 | 安徽迪诺环保新材料科技有限公司 | Method for utilizing waste heat of calcining tail gas in titanium dioxide production by sulfuric acid process |
| CN112079381A (en) * | 2020-09-04 | 2020-12-15 | 江苏镇钛化工有限公司 | Method for producing special rutile type titanium dioxide of powder coating |
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| CN113582228A (en) * | 2021-08-13 | 2021-11-02 | 广东惠云钛业股份有限公司 | Preparation method and application of high-whiteness titanium dioxide |
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