CN107804870A - A kind of production method of titanium dioxide - Google Patents
A kind of production method of titanium dioxide Download PDFInfo
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- CN107804870A CN107804870A CN201711119429.2A CN201711119429A CN107804870A CN 107804870 A CN107804870 A CN 107804870A CN 201711119429 A CN201711119429 A CN 201711119429A CN 107804870 A CN107804870 A CN 107804870A
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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
- C01G23/07—Producing by vapour phase processes, e.g. halide oxidation
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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Abstract
The invention discloses a kind of production method of titanium dioxide, it comprises the following steps：Step 1, start high temperature preheating stove unit and reactant feeding unit, reactant is preheated；Step 2, the reactant after obtained preheating is pumped into tubular type high-temperature reactor carries out hybrid reaction, obtained mixed airflow is sent into heat exchanger；Step 3, heat exchanger are passed through in gas-solid separator after cooling to mixed airflow；Step 4, gas-solid separator produce after carrying out gas solid separation.A kind of production method of titanium dioxide provided by the invention, mainly solve the problems, such as that production cost present in existing production technology is higher, titanium dioxide yield is relatively low and wastage of material is more serious, by setting heat exchanger and improving production technology, reduce the operating cost of whole production system, improve the yield of titanium dioxide, the loss amount of product is controlled between 0.2 0.5%, and product yield reaches the 83.8 93.4% of theoretical yield.
Description
Technical field
The present invention relates to titanium dioxide production technical field, more particularly to a kind of production method of titanium dioxide.
Background technology
The preparation method of titanium dioxide mainly includes Physical and chemical method, and Physical mainly includes sputtering method, thermal evaporation
Method and laser evaporization method, chemical method mainly include liquid phase method and vapor phase method, and liquid phase method mainly includes sluggish precipitation and colloidal sol-solidifying
Glue method, vapor phase method mainly include TiCl4Vapour phase oxidation process, typically use TiCl at present4Vapour phase oxidation process prepares titanium dioxide.
TiCl4Vapour phase oxidation process is usually with nitrogen as TiCl4Carrier gas, using oxygen as oxidant, in high-temperature tubular reactor
Oxidation reaction is carried out, through gas solid separation, obtains titanium dioxide powder.In practical application in industry, TiCl4Vapour phase oxidation process produces
Titanium dioxide power consumption is higher, and yield is relatively low, and wastage of material is more serious, is not often used widely, in vent gas treatment process,
Considerable amount of titania powder has often been remained, can typically remain at least 1.0% titania powder（% represents that single obtains
The gross mass of titanium dioxide）, tail gas absorption agent dosage is higher, and production cost is high, and enterprise profit is relatively low, and this is also TiCl4Gas phase
The major reason that oxidizing process production titanium dioxide is not utilized extensively.
The content of the invention
The goal of the invention of the present invention is：For above-mentioned problem, there is provided a kind of production method of titanium dioxide, it is main
Solves existing TiCl4Production cost is higher present in vapour phase oxidation process production titania systems, titanium dioxide yield compared with
The problem of low and wastage of material is more serious, by setting heat exchanger and improving production technology, to reduce the fortune of whole production system
Row cost, improve the yield of titanium dioxide.
The technical solution adopted by the present invention is as follows：A kind of production method of titanium dioxide, it is characterised in that it includes following
Step：
Step 1, start high temperature preheating stove unit and reactant feeding unit, by O2It is pumped into O2In preheating furnace unit and by O2Preheating
To 850-950 DEG C, the O after being preheated2；Proportionally by TiCl4And N2The gas-liquid mixed air-flow of formation is pumped into gas-liquid mixed gas
900-1000 DEG C is preheated in stream preheating furnace unit and by gas-liquid mixed air-flow, the gas-liquid mixed air-flow after being preheated；
Step 2, by the O after obtained preheating2Tubular type height is pumped into the gas-liquid mixed air-flow after preheating simultaneously according to a certain percentage
Hybrid reaction is carried out in warm reactor, controlling the reaction temperature in tubular type high-temperature reactor, reaction terminates between 850-950 DEG C
After obtain mixed airflow, mixed airflow is sent into heat exchanger and carries out subsequent processing by tubular type high-temperature reactor；
Step 3, heat exchanger are received the mixed airflow from tubular type high-temperature reactor, and mixed airflow are dropped using cooling water
Temperature is cooled to less than 150 DEG C, mixed airflow and high-temperature cooling water after being cooled down, and the mixed airflow after cooling is passed through gas-solid point
From gas solid separation is carried out in device, high-temperature cooling water is collected and otherwise utilized as heat-recovery medium；
The mixed airflow of step 4, gas-solid separator to after carries out gas solid separation, obtains powder and mixed gas, powder passes through powder
Body output end is delivered in powder collection device, that is, obtains titanium dioxide, and mixed gas is delivered to tail gas by gas output end
Processing unit carries out vent gas treatment, through tail gas treating unit to the Cl in mixed gas2Absorbed with residual powder and reach discharge
After standard, externally directly discharge.
In the production method of the present invention, O2Preheating temperature and TiCl4With N2The preheating temperature of the gas-liquid mixed air-flow of formation
Can degree selection be more crucial, when this directly influences postorder hybrid reaction, prevent side reaction generation completely, in traditional mode of production body
In system, usually by O2850-1000 DEG C is preheated to, gas-liquid mixed air-flow is preheated to less than O250-100 DEG C of preheating temperature, with
Improve O2Oxidation activity, improve reaction rate, ensure reaction generation be entirely TiO2, and without side reaction Ti2O3Cl2Generation.
In the present invention, O2The preheating temperature of preheating temperature is 850-950 DEG C, and the preheating temperature of gas-liquid mixed air-flow is 900-1000
DEG C, it is not required for O2Preheating temperature is higher than the preheating temperature of gas-liquid mixed air-flow.
Meanwhile the chilling temperature of mixed airflow is also more important, is obtained by experimental study, the temperature of mixed airflow is down to
At 80 DEG C, the influence of the temperature of mixed airflow to gas solid separation process minimizes, and at such a temperature, the effect of gas solid separation is most
It is good, the solid powder of the overwhelming majority can be made to be separated from mixed airflow, the loss amount of solid powder is no more than 0.5%, dioxy
The yield for changing titanium effectively improves, and the present invention is considering the performance of heat exchanger, heat exchange operating cost and titanium dioxide
In the case of yield, the chilling temperature of mixed airflow is set as being not more than 150 DEG C.
Further, O2And TiCl4It is 3 according to mol ratio:1 quantitative relation hybrid reaction in tubular type high-temperature reactor.
O2And TiCl4Molar ratio need strict implement, only work as O2When excessive, TiCl4It can just react generation titanium dioxide completely, and O2
Content is unsuitable excessive, works as O2And TiCl4Mol ratio be more than 3:When 1, O2Not only consumption is excessive, its obtained titanium dioxide powder
Weight has declined, and the particle diameter of titanium dioxide is difficult to control, therefore, too many excessive O2It is unfavorable for improving the two of production system
The yield of titanium oxide.
Further, it is not less than 0.5m/s in the flowing velocity of tubular type high-temperature reactor interior air-flow, in tubular type high-temperature reactor
The interior reaction time is no less than 5s.Reaction time should be no less than 5s, and the reaction time is too short, and reaction is incomplete, there is accessory substance generation,
Anatase titanium dioxide content is more in obtained titanium dioxide, thus influences degree of purity.
Preferably, work as O2The preheating temperature of preheating temperature is 900 DEG C, and the preheating temperature of gas-liquid mixed air-flow is 900 DEG C
When, the reaction rate of hybrid reaction has reached optimal.
Further, in order to obtain decentralization preferably gas-liquid mixed air-flow, hybrid reaction speed is improved, makes titanium dioxide
Particle diameter is more easy to be effectively controlled, N2And TiCl4Mol ratio be（3-10）：1.
Preferably, the chilling temperature of mixed airflow is 124 DEG C.
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：Provided by the invention a kind of two
The production method of titanium oxide, mainly solves existing TiCl4It is produced into present in vapour phase oxidation process production titania systems
The problem of this is higher, titanium dioxide yield is relatively low and wastage of material is more serious, by setting heat exchanger and improving production technology, drop
The low operating cost of whole production system, the yield of titanium dioxide is improved, the rutile that purity is 100.0% can be obtained
Type titanium dioxide, the loss amount of product are controlled between 0.2-0.5%, and product yield reaches the 83.8-93.4% of theoretical yield, value
Obtain popularization and application.
Brief description of the drawings
Fig. 1 is a kind of operation system structure schematic diagram of titanium dioxide of the present invention；
Fig. 2 is the high temperature preheating furnace structure schematic diagram of the present invention；
Fig. 3 is the heat exchange unit cross section structure diagram of the present invention.
Marked in figure：1 is high temperature preheating stove, and 2 be heat exchange unit, and 3 be heat exchange outer tube, and 4 be heat exchange inner tube, and 5 change for one-level
Hot cell, 6 be secondary heat exchange room, and 7 be one-level heat exchanging pipe, and 8 be gas buffer, and 9 be secondary heat exchange pipeline, and 10 be supply
Pump, 11 be O2Preserving jar, 12 be TiCl4Preserving jar, 13 be N2Preserving jar, 14 be O2Preheating furnace unit, 15 be gas-liquid mixed air-flow
Preheating furnace unit, 16 be tubular type high-temperature reactor, and 17 be heat exchanger, and 18 be gas-solid separator, and 19 be powder collection device, and 20 are
Tail gas treating unit.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is described in detail.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1 to Figure 3, a kind of production system of titanium dioxide, it includes：
High temperature preheating stove unit, for reactant to be preheated into 850-1000 DEG C, the input of high temperature preheating stove unit and reaction
Thing feeding unit connects, the input of the output end connection tubular type high-temperature reactor 16 of high temperature preheating stove unit；
Tubular type high-temperature reactor 16, the place to be reacted for providing the reactant mixing after preheating, tubular type high-temperature reactor
The input of 16 output end connection heat exchanger 17, reacted mixed airflow is delivered in heat exchanger 17；
Heat exchanger 17, for reacted mixed airflow to be cooled into less than 150 DEG C, an input connecting tube of heat exchanger 17
The output end of formula high-temperature reactor 16, its another input connection cooling water system, the output end connection gas-solid of heat exchanger 17
The input of separator 18；
Gas-solid separator 18, for carrying out gas solid separation, the powder output end of gas-solid separator 18 to the mixed airflow after cooling
Connect powder collection device 19, the gas output end connection tail gas treating unit 20 of gas-solid separator 18.
In above-mentioned production system, the setting of heat exchanger 17 is the most key, and in tubular type high-temperature reactor 16, discharge mixes
The temperature for closing air-flow reaches more than 600 DEG C, when existing production technology is by setting long pipeline to naturally cool to 300 DEG C or so
Gas solid separation just is carried out to it, it not only needs to put into larger into original laying long pipeline, and carries out gas-solids at 300 DEG C or so
During separation, because the gas molecule in mixed airflow is very active, mixed airflow is not easy sedimentation separation in cyclonic separation, and then
Cause still to contain considerable amount of solid powder in the mixed gas after separation.In the present invention, the heat exchanger 17 of setting avoids
The trouble of laying long pipeline, is cooled, it can not only recycle mixed airflow using heat exchanger 17 to mixed airflow
Heat, reach save the energy purpose, it can also make the temperature of mixed airflow easily controllable, shorten mixed airflow it is cooled
The time required to journey；The chilling temperature of mixed airflow be set as be not more than 150 DEG C, preferably 124 DEG C, so not only can fully profit
With the function of heat exchanger 17, moreover it is possible to reduce heat exchange cost, the yield of titanium dioxide effectively improves, and the control of its loss amount exists
Between 0.2-0.5%, thus efficiently solve production cost present in traditional processing technology is higher, titanium dioxide yield compared with
The problem of low and wastage of material is more serious.
Further, in order to preferably be preheated to reactant, reactant feeding unit includes transfer pump 10 and storing
Reactant in tank is pumped into high temperature preheating stove unit by tank, preserving jar by transfer pump 10.Shape is provided using transfer pump 10
Into the power of air-flow, so that reactant forms the air-flow with certain flow rate in high temperature preheating stove unit.
Further, in order to preferably implement the reactant feeding unit of the present invention, preserving jar includes O respectively2Preserving jar
11、TiCl4Preserving jar 12 and N2Preserving jar 13, O2Preserving jar 11 is by transfer pump 10 by O2It is pumped into high temperature preheating stove unit；
TiCl4Preserving jar 12 and N2Preserving jar 13 is by another transfer pump 10 by TiCl4And N2The gas-liquid mixed air-flow of formation is pumped into separately
In one high temperature preheating stove unit.
Further, in order to preferably implement the high temperature preheating stove unit of the present invention, high temperature preheating stove unit includes O2In advance
Hot stove unit 14 and gas-liquid mixed airflow preheating furnace unit 15, O2Preheating furnace unit 14 is used for O2Preheated, O2Preheating furnace list
One input of the output end connection tubular type high-temperature reactor of member 14；Gas-liquid mixed air-flow preheating furnace unit 15 be used for pair
TiCl4And N2The gas-liquid mixed air-flow of formation is preheated, the output end connection tubular type high temperature of gas-liquid mixed air-flow preheating furnace unit
Another input of reactor 16, O2Preheating furnace unit 14 is identical with gas-liquid mixed airflow preheating furnace 15 structures of unit.
Further, in order to reduce its energy consumption, the energy consumption of titanium dioxide production system is made effectively be reduced, high temperature preheating
Stove unit includes high temperature preheating stove 1, and the interpolation of high temperature preheating stove 1 is placed with multiple heat exchange units 2 by placed in series, the heat exchange
Unit 2 includes heat exchange outer tube 3, and heat exchange inner tube 4 is provided with the outer tube 3 that exchanges heat, and exchanges heat closed between outer tube 3 and heat exchange inner tube 4
Space forms one-level Heat Room 5, and the chamber of heat exchange inner tube 4 forms secondary heat exchange room 6, the one-level heat exchange between adjacent heat exchange unit 2
Room 5 forms one-level heat-exchange system by the series connection of one-level heat exchanging pipe 7, and the head end of one-level heat-exchange system connects gas buffer 8,
Its end is connected with an input of tubular type high-temperature reactor 16；Secondary heat exchange room 6 between adjacent heat exchange unit 2 passes through two level
The series connection of heat exchanging pipe 9 forms secondary heat exchange system, the head end ligation reaction feeding unit of secondary heat exchange system, its end and gas
Body buffer unit 8 connects.
In above-mentioned, when being preheated to reactant, the reactant that preheats will be needed by reactant feeding unit first
It is delivered in secondary heat exchange system, in heat exchange unit 2, the temperature of one-level Heat Room 5 is more than the temperature of secondary heat exchange room 6, treats
After the reactant of preheating exchanges heat through multiple secondary heat exchange rooms 6, it is provided with an initial preheating temperature, and is transported to gas and delays
In flushing device 8, gas buffer 8 is reallocated to reactant, is then sent in one-level heat-exchange system, reactant
Reach design preheating temperature after the heat exchange of multiple one-level Heat Rooms 5, and it is anti-by one-level heat exchanging pipe 7 to be delivered to tubular type high temperature
Answer in device 16 and enter subsequent processing.In the process, the reactant in the reactant in one-level Heat Room 5 and secondary heat exchange room 6
Heat exchange is produced, for secondary heat exchange room 6, the reactant in secondary heat exchange room 6 can obtain a stably thermograde,
The preheating temperature of reactant in secondary heat exchange room 6 uniformly rises, and the situation for avoiding overheat and unstable preheating occurs, at the beginning of it
Beginning, it is good to preheat environment；For one-level Heat Room 5, the reactant after uniformly preheating is due to being provided with an initial preheating
Temperature, therefore possess the basic condition quickly heated to it, the reactant in one-level Heat Room 5 can obtain one higher
Thermograde, its preheating rate significantly improves, and after several times heat exchange unit 2 preheats, it can soon be preheated to design temperature,
Preheating time is effectively shortened.On the whole, each heat exchange unit 2 is preheated twice to reactant, and it preheats number
More than traditional heat exchange unit 2, the setting of the heat exchange unit 2 of 1 times of tradition can be saved.Meanwhile heat exchange unit 2 of the invention can
Heat energy is made full use of, the secondary use to heat energy can be formed, its heat exchange efficiency is higher, and the later stage is rapidly heated so that its is pre-
The hot time has obtained effectively shortening, and thus improves the pre- thermal efficiency of high temperature preheating stove 1 on the whole, high temperature preheating stove 1
Structure is simplified, and reduces the manufacturing cost and operating cost of high temperature preheating stove 1, makes the energy consumption of titanium dioxide production system
Effective reduction is obtained.
In order to preferably explain the present invention, specific embodiment is exemplified below：
Embodiment 1
A kind of production method of titanium dioxide, it comprises the following steps：
Step 1, start high temperature preheating stove unit and reactant feeding unit, by O2It is pumped into O2In preheating furnace unit 14 and by O2In advance
Heat is to 950 DEG C, the O after being preheated2；According to N2And TiCl4Mol ratio be 4：1 ratio is by TiCl4And N2The gas-liquid of formation
Mixed airflow is pumped into gas-liquid mixed air-flow preheating furnace unit 15 and gas-liquid mixed air-flow is preheated into 900 DEG C, after obtaining preheating
Gas-liquid mixed air-flow；
Step 2, by the O after obtained preheating2With the gas-liquid mixed air-flow after preheating according to O2And TiCl4Mol ratio is 3:1 ratio
Example is pumped into tubular type high-temperature reactor 16 simultaneously carries out hybrid reaction, and the reaction temperature in control tubular type high-temperature reactor 16 exists
Between 900 DEG C, the flowing velocity of air-flow is 0.8m/s, reaction time 7s, and reaction obtains mixed airflow, tubular type high temperature after terminating
Mixed airflow is sent into heat exchanger 17 and carries out subsequent processing by reactor 16；
Step 3, heat exchanger receive the mixed airflow from tubular type high-temperature reactor 16, and mixed airflow is carried out using cooling water
For cooling down to 150 DEG C, mixed airflow and high-temperature cooling water after being cooled down, the mixed airflow after cooling are passed through gas solid separation
Gas solid separation is carried out in device 18；
The mixed airflow of step 4, gas-solid separator 18 to after carries out gas solid separation, obtains powder and mixed gas, powder passes through
Powder output end is delivered in powder collection device 19, that is, obtains titanium dioxide, and mixed gas is delivered to by gas output end
Tail gas treating unit 20 carries out vent gas treatment, through tail gas treating unit to the Cl in mixed gas2Absorb and reach with residual powder
To after discharge standard, externally directly discharge.
Embodiment 2
A kind of production method of titanium dioxide, it comprises the following steps：
Step 1, start high temperature preheating stove unit and reactant feeding unit, by O2It is pumped into O2In preheating furnace unit 14 and by O2In advance
Heat is to 900 DEG C, the O after being preheated2；According to N2And TiCl4Mol ratio be 5：1 ratio is by TiCl4And N2The gas-liquid of formation
Mixed airflow is pumped into gas-liquid mixed air-flow preheating furnace unit 15 and gas-liquid mixed air-flow is preheated into 900 DEG C, after obtaining preheating
Gas-liquid mixed air-flow；
Step 2, by the O after obtained preheating2With the gas-liquid mixed air-flow after preheating according to O2And TiCl4Mol ratio is 3:1 ratio
Example is pumped into tubular type high-temperature reactor 16 simultaneously carries out hybrid reaction, and the reaction temperature in control tubular type high-temperature reactor 16 exists
Between 850 DEG C, the flowing velocity of air-flow is 0.6m/s, reaction time 7s, and reaction obtains mixed airflow, tubular type high temperature after terminating
Mixed airflow is sent into heat exchanger 17 and carries out subsequent processing by reactor 16；
Step 3, heat exchanger receive the mixed airflow from tubular type high-temperature reactor 16, and mixed airflow is carried out using cooling water
For cooling down to 124 DEG C, mixed airflow and high-temperature cooling water after being cooled down, the mixed airflow after cooling are passed through gas solid separation
Gas solid separation is carried out in device 18；
The mixed airflow of step 4, gas-solid separator 18 to after carries out gas solid separation, obtains powder and mixed gas, powder passes through
Powder output end is delivered in powder collection device 19, that is, obtains titanium dioxide, and mixed gas is delivered to by gas output end
Tail gas treating unit 20 carries out vent gas treatment, through tail gas treating unit to the Cl in mixed gas2Absorb and reach with residual powder
To after discharge standard, externally directly discharge.
Implement 3
A kind of production method of titanium dioxide, it comprises the following steps：
Step 1, start high temperature preheating stove unit and reactant feeding unit, by O2It is pumped into O2In preheating furnace unit 14 and by O2In advance
Heat is to 950 DEG C, the O after being preheated2；According to N2And TiCl4Mol ratio be 10：1 ratio is by TiCl4And N2The gas-liquid of formation
Mixed airflow is pumped into gas-liquid mixed air-flow preheating furnace unit 15 and gas-liquid mixed air-flow is preheated into 900 DEG C, after obtaining preheating
Gas-liquid mixed air-flow；
Step 2, by the O after obtained preheating2With the gas-liquid mixed air-flow after preheating according to O2And TiCl4Mol ratio is 3:1 ratio
Example is pumped into tubular type high-temperature reactor 16 simultaneously carries out hybrid reaction, and the reaction temperature in control tubular type high-temperature reactor 16 exists
Between 900 DEG C, the flowing velocity of air-flow is 0.8m/s, reaction time 5s, and reaction obtains mixed airflow, tubular type high temperature after terminating
Mixed airflow is sent into heat exchanger 17 and carries out subsequent processing by reactor 16；
Step 3, heat exchanger receive the mixed airflow from tubular type high-temperature reactor 16, and mixed airflow is carried out using cooling water
For cooling down to 100 DEG C, mixed airflow and high-temperature cooling water after being cooled down, the mixed airflow after cooling are passed through gas solid separation
Gas solid separation is carried out in device 18；
The mixed airflow of step 4, gas-solid separator 18 to after carries out gas solid separation, obtains powder and mixed gas, powder passes through
Powder output end is delivered in powder collection device 19, that is, obtains titanium dioxide, and mixed gas is delivered to by gas output end
Tail gas treating unit 20 carries out vent gas treatment, through tail gas treating unit to the Cl in mixed gas2Absorb and reach with residual powder
To after discharge standard, externally directly discharge.
The main production target of above-described embodiment is as shown in table 1 below：
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should be included in the scope of the protection.
Claims (6)
1. a kind of production method of titanium dioxide, it is characterised in that it comprises the following steps：
Step 1, start high temperature preheating stove unit and reactant feeding unit, by O2It is pumped into O2In preheating furnace unit and by O2Preheating
To 850-950 DEG C, the O after being preheated2；Proportionally by TiCl4And N2The gas-liquid mixed air-flow of formation is pumped into gas-liquid mixed gas
900-1000 DEG C is preheated in stream preheating furnace unit and by gas-liquid mixed air-flow, the gas-liquid mixed air-flow after being preheated；
Step 2, by the O after obtained preheating2Tubular type high temperature is pumped into the gas-liquid mixed air-flow after preheating simultaneously according to a certain percentage
Hybrid reaction is carried out in reactor, the reaction temperature in tubular type high-temperature reactor is controlled between 850-950 DEG C, after reaction terminates
Mixed airflow is obtained, mixed airflow is sent into heat exchanger and carries out subsequent processing by tubular type high-temperature reactor；
Step 3, heat exchanger are received the mixed airflow from tubular type high-temperature reactor, and mixed airflow are dropped using cooling water
Temperature is cooled to less than 150 DEG C, mixed airflow and high-temperature cooling water after being cooled down, and the mixed airflow after cooling is passed through gas-solid point
From gas solid separation is carried out in device, high-temperature cooling water is collected and otherwise utilized as heat-recovery medium；
The mixed airflow of step 4, gas-solid separator to after carries out gas solid separation, obtains powder and mixed gas, powder passes through powder
Body output end is delivered in powder collection device, that is, obtains titanium dioxide, and mixed gas is delivered to tail gas by gas output end
Processing unit carries out vent gas treatment, through tail gas treating unit to the Cl in mixed gas2Absorbed with residual powder and reach discharge
After standard, externally directly discharge.
2. the production method of titanium dioxide as claimed in claim 1, it is characterised in that O2And TiCl4It is 3 according to mol ratio:1
Quantitative relation in tubular type high-temperature reactor hybrid reaction.
3. the production method of titanium dioxide as claimed in claim 1, it is characterised in that in tubular type high-temperature reactor interior air-flow
Flowing velocity is not less than 0.5m/s, and the reaction time in tubular type high-temperature reactor is no less than 5s.
4. the production method of titanium dioxide as claimed in claim 1, it is characterised in that O2The preheating temperature of preheating temperature is 900
DEG C, the preheating temperature of gas-liquid mixed air-flow is 900 DEG C.
5. the production method of titanium dioxide as claimed in claim 1, it is characterised in that N2And TiCl4Mol ratio be（3-
10）：1.
6. the production method of titanium dioxide as claimed in claim 1, it is characterised in that the chilling temperature of mixed airflow is 124
℃。
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