CN109809469A - The method of low melting point complex in side reaction is removed in a kind of production of titanium chloride - Google Patents
The method of low melting point complex in side reaction is removed in a kind of production of titanium chloride Download PDFInfo
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- CN109809469A CN109809469A CN201711160796.7A CN201711160796A CN109809469A CN 109809469 A CN109809469 A CN 109809469A CN 201711160796 A CN201711160796 A CN 201711160796A CN 109809469 A CN109809469 A CN 109809469A
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- titanium chloride
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- low melting
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Abstract
The method of low melting point complex in side reaction is removed in a kind of production of titanium chloride, when fused salt chlorimation method produces titanium chloride, contain the titanium chloride gas of chloride impurity after dust-precipitator gathers dust in the high temperature that Molten salt chlorination furnace generates, it is eluted into eluting column with titanium chloride liquid, in elution column overhead, one water spray spray head is set, the water spray spray head is set to carry out shower water by being passed through chlorine, into the NaAlCl4 carried secretly in the water and titanium chloride gas in eluting column, reaction is hydrolyzed in NaFeCl4 low melting point complex and AlCl3, generate aluminium oxide and iron oxide, as titanium chloride enters in the elution slot of eluting column, it is mixed into mud, then the mud eluted in slot dust-precipitator is back to gather dust.Advantage is: can remove NaAlCl4, NaFeCl4 low melting point complex in side reaction, guarantees fused salt chlorimation reactor assembly long-time steady operation.
Description
Technical field
The present invention relates to the methods that low melting point complex in side reaction is removed in a kind of production of titanium chloride.
Background technique
Currently, large-scale fused salt chlorimation production technology has been mature technology at home, the alumina component in rich-titanium material is being matched
Chlorination can occur in carbon chlorination process and generate AlCl3, chlorination rate is generally up to 50% or more.AlCl3It is layer structure in solid-state,
Al is translated into when close to its melting temperature2Cl6Molecular structure, and gas phase is volatized into dimer vapors molecule;Work as temperature
After degree further increases, dimer molecule is decomposed into AlCl again3Molecule.In fused salt chlorimation system, FeCl3Behavior and AlCl3Class
Seemingly.In fused salt chlorimation reactor, product AlCl3、FeCl3It may be with the NaCl or KCl formation saturated vapor in molten salt system
Press relatively low chloride complexes NaAlCl4、NaFeCl4, influence the stable fortune of long period in fused salt chlorimation production process
Row, especially NaAlCl4、NaFeCl4Fusing point is low, is not easy to remove, be mixed in the titanium chloride of generation, as titanium chloride moves back;This
Under the dust-precipitator and eluting column temperature gradient of post-processing, the complex of this kind of low melting point successively condenses out sample, gradually bonds
In the wall of dust-precipitator and eluting column, it can make to bond more complex on system wall quickly, can only stop in process of production
Heat preservation is produced, carries out physics operation to the NaAlCl being bonded in system4、NaFeCl4Low melting point complex is cleared up, and system is influenced
Long-term operation.
Take into account dust collection effect and chlorination titanium recovery rate, afterbody dust-precipitator flue gas exit temperature need to control 190 DEG C~
200℃.The temperature is higher than NaAlCl4、NaFeCl4And AlCl3Boiling point, this makes NaAlCl4、NaFeCl4And AlCl3Largely into
Enter eluting column and fails as FeCl3It equally removes in dust-precipitator, is discharged in the form of dust-slag collection.Due to scrubbed in eluting column
The thick titanium chloride underflow slurry generated, which directly returns, gathers dust or chlorination system, will gasify again, to gather dust-elute in chlorination-
Continuous circulative accumulation in system, not only increases system burden, also easily causes system knot wall, dust-slag collection local liquefaction, heat exchange
The problems such as device fouling, influences the stability of chlorination operation.In addition, NaAlCl4、NaFeCl4With a small amount of AlCl3Can also
To subsequent TiCl4Purification and titanium sponge production cause adverse effect, and as a kind of very strong lewis acid of acidity, set to steel
It is standby that there is very strong corrosivity.Bigger difficulty is caused to the period of steady production chlorination titanium products.
Summary of the invention
The technical problem to be solved in the present invention is to provide remove low melting point complex in side reaction in a kind of production of titanium chloride
Method.
The technical solution of the invention is as follows:
The method that low melting point complex in side reaction is removed in a kind of production of titanium chloride, comprises the concrete steps that:
When fused salt chlorimation method produces titanium chloride, contain the titanium chloride gas of chloride impurity in the high temperature that Molten salt chlorination furnace generates
Body is eluted after dust-precipitator gathers dust, into eluting column with titanium chloride liquid, and titanium chloride gas flow is 1000m3/ h~
1100m3/ h, temperature are 220 DEG C, and a water spray spray head is arranged in elution column overhead, makes the water spray by being passed through chlorine
Spray head carries out shower water, and the pressure of chlorine is 0.45Mpa, flow 12m3/ h, spray water flow are 20kg/h~24kg/h, leaching
It washes temperature in tower to control at 180 DEG C~200 DEG C, into the NaAlCl carried secretly in the water and titanium chloride gas in eluting column4、
NaFeCl3Low melting point complex and AlCl3Reaction is hydrolyzed, aluminium oxide and iron oxide are generated, as titanium tetrachloride enters leaching
It washes in the elution slot of tower, is mixed into mud, the mud eluted in slot is then back to dust-precipitator and carries out dust-precipitator, in mud
Aluminium oxide and iron oxide gather dust in dust-precipitator at solid state.
Beneficial effects of the present invention:
At moderate temperatures, NaAlCl4、NaFeCl4Low melting point complex and AlCl3Prior to TiCl4It hydrolyzes,
The NaAlCl being introduced into water selective hydrolyzation system in right amount4、NaFeCl4And AlCl3, it is allowed to be changed into solid oxide, with mud
Slurry form returns to the tower that gathers dust and gathers dust, so as to avoid NaAlCl4、NaFeCl4Wall built-up of the equal low-boiling point materials in eluting column is existing
As guaranteeing fused salt chlorimation reactor assembly long-time steady operation.
Specific embodiment
Embodiment
When fused salt chlorimation method produces titanium chloride, contain chloride impurity (predominantly chlorine in the high temperature that Molten salt chlorination furnace generates
Change aluminium and iron chloride) titanium chloride gas after dust-precipitator gathers dust, eluted into eluting column with titanium chloride liquid, four chlorinations
Titanium gas flow is 1000m3/ h, temperature are 220 DEG C, increase a water spray spray head in elution column overhead, by being passed through nitrogen
The water spray spray head is set to carry out shower water, the pressure of chlorine is 0.45Mpa, flow 12m3/ h, spray water flow 20kg/
H, temperature control is at 180 DEG C in eluting column, into the NaAlCl carried secretly in the water and titanium chloride gas in eluting column4、NaFeCl4
Low melting point complex and AlCl3Reaction is hydrolyzed, aluminium oxide and iron oxide are generated, as titanium chloride enters the leaching of eluting column
In washing trough, be mixed into mud, the mud eluted in slot be then back to dust-precipitator and carries out dust-precipitator, aluminium oxide in mud and
Iron oxide gathers dust in dust-precipitator at solid state, is discharged as dust-slag collection, and Al content is 20% in the dust-slag collection in the tower that gathers dust,
It can guarantee system long-period stable operation without wall built-up phenomenon substantially in eluting column.
Claims (1)
1. a kind of method for removing low melting point complex in side reaction in titanium chloride production, it is characterized in that: fused salt chlorimation method produces
When titanium chloride, in the titanium chloride gas that the high temperature that Molten salt chlorination furnace generates contains chloride impurity after dust-precipitator gathers dust, enter
Eluting column is eluted with titanium chloride liquid, and titanium chloride gas flow is 1000m3/h~1100m3/h, temperature is 220 DEG C,
It elutes column overhead and one water spray spray head is set, so that the water spray spray head is carried out shower water, the pressure of chlorine by being passed through chlorine
Power is 0.45Mpa, flow 12m3/h, and spray water flow is 20kg/h~24kg/h, in eluting column temperature control 180 DEG C~
200 DEG C, into NaAlCl4, NaFeCl4 low melting point complex for carrying secretly in the water and titanium chloride gas in eluting column and
Reaction is hydrolyzed in AlCl3, generates aluminium oxide and iron oxide as titanium chloride enters in the elution slot of eluting column and is mixed into mud
In, the mud eluted in slot is then back to dust-precipitator and carries out dust-precipitator.
Priority Applications (1)
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CN201711160796.7A CN109809469A (en) | 2017-11-20 | 2017-11-20 | The method of low melting point complex in side reaction is removed in a kind of production of titanium chloride |
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CN201711160796.7A CN109809469A (en) | 2017-11-20 | 2017-11-20 | The method of low melting point complex in side reaction is removed in a kind of production of titanium chloride |
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CN109809469A true CN109809469A (en) | 2019-05-28 |
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CN201711160796.7A Pending CN109809469A (en) | 2017-11-20 | 2017-11-20 | The method of low melting point complex in side reaction is removed in a kind of production of titanium chloride |
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2017
- 2017-11-20 CN CN201711160796.7A patent/CN109809469A/en active Pending
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WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190528 |
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WD01 | Invention patent application deemed withdrawn after publication |