CN103965660B - The industrial coating method of titanium dioxide and industrial coating system - Google Patents
The industrial coating method of titanium dioxide and industrial coating system Download PDFInfo
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- CN103965660B CN103965660B CN201410213422.7A CN201410213422A CN103965660B CN 103965660 B CN103965660 B CN 103965660B CN 201410213422 A CN201410213422 A CN 201410213422A CN 103965660 B CN103965660 B CN 103965660B
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Abstract
The invention provides a kind of industrial coating method of titanium dioxide and industrial coating system.Described coating method comprises the sodium aluminate solution of compounding high concentration low alkalinity, wherein n
na2O: n
al2O3be 1.25 ~ 1.3, and its concentration is with Al
2o
3count 300 ~ 350/L; The sodium aluminate solution of high density low alkalinity is diluted in the duct its concentration with Al
2o
3count 95 ~ 105/L and be delivered to coating operation.Described coating system comprises the sodium aluminate solution storage tank and coating reactor that are connected by pipeline, sodium aluminate solution storage tank is for storing the sodium aluminate solution of above-mentioned high density low alkalinity, coating reactor is loaded with Titanium dioxide slurry, pipeline is provided with diluent entrance.According to the engineer applied that present invention achieves low alkalinity sodium metaaluminate and carry out titanium dioxide coating, and gained coated product performance index are better than existing commodity sodium metaaluminate coated product.
Description
Technical field
The present invention relates to titanium white technical field, more particularly, relate to a kind of utilize low alkalinity sodium metaaluminate to carry out titanium dioxide coating in the industrial production technique and system.
Background technology
Sodium metaaluminate electroless plating aluminum oxide to titanium dioxide carry out surface treatment can improve titanium dioxide pigment performance, widen its Application Areas, therefore, sodium metaaluminate is widely used in titanium dioxide coating.At present, what production adopts is industrial sodium metaaluminate (i.e. commodity sodium metaaluminate), the higher (n of its basicity
na2O: n
al2O3>3), wherein containing a large amount of sodium hydroxide, to need to use in electroless plating in more acid and, produce a large amount of salt refuse after neutralization, cause the waste of raw material and the pollution of environment; In addition, in cycle production time long (reaction times >3h) of industrial sodium metaaluminate, cause the infringement to equipment and a large amount of energy consumption, affect its industrial application and production.
Summary of the invention
For the deficiencies in the prior art, an object of the present invention is to solve in above-mentioned prior art the one or more problems existed.Such as, an object of the present invention is to provide a kind of technique and the system that are utilizing low alkalinity sodium metaaluminate to carry out titanium dioxide coating in the industrial production.
To achieve these goals, an aspect of of the present present invention provides a kind of industrial coating method of titanium dioxide.Described coating method comprises the following steps: preparation sodium aluminate solution, n in described sodium aluminate solution
na2O: n
al2O3be 1.25 ~ 1.3, and the concentration of described sodium aluminate solution is with Al
2o
3count 300 ~ 350/L; Described sodium aluminate solution is diluted by pipeline and is delivered in Titanium dioxide slurry and carries out coating, wherein, described sodium aluminate solution is diluted to its concentration with Al in pipe conveying procedure
2o
3count 95 ~ 105/L.
According to an embodiment of the industrial coating method of titanium dioxide of the present invention, the step of described preparation sodium aluminate solution comprises: preparation mass percentage concentration is the sodium hydroxide solution of 48 ~ 50%; In described sodium hydroxide solution, add aluminium hydroxide and be heated to boiling, treating that gained mixed solution becomes clarification gradually by muddiness, continuing to keep boiling 120 ~ 150min, obtain described sodium aluminate solution.
According to an embodiment of the industrial coating method of titanium dioxide of the present invention, described method also comprise the mass percentage concentration of described preparation be 48 ~ 50% sodium hydroxide solution be preheated to 80 ~ 100 DEG C.
According to an embodiment of the industrial coating method of titanium dioxide of the present invention, in described pipeline, be provided with baffling assembly.
Another aspect provides a kind of industrial coating system of titanium dioxide, described coating system comprises diluent supply-pipe, the first valve, the second valve, first-class gauge, second gauge, sodium aluminate solution storage tank and coating reactor, wherein, sodium aluminate solution is had, n in described sodium aluminate solution in described sodium aluminate solution storage tank
na2O: n
al2O3be 1.25 ~ 1.3, and the concentration of described sodium aluminate solution is with Al
2o
3count 300 ~ 350/L; In described coating reactor, splendid attire needs the Titanium dioxide slurry of coating, and is connected with described sodium aluminate solution storage tank by pipeline; Described diluent supply-pipe and described pipeline communication, to pass into diluent in described pipeline and described sodium aluminate solution be diluted to its concentration with Al
2o
3count 95 ~ 105/L; Described first valve and first-class gauge are successively set in the part between sodium metaaluminate storage tank and diluent supply-pipe of described pipeline according to the flow direction of sodium aluminate solution; Described second valve and second gauge are successively set on described diluent supply-pipe according to the flow direction of diluent.
According to an embodiment of the industrial coating system of titanium dioxide of the present invention, baffling assembly is provided with in the part between described diluent supply-pipe and described coating reactor of described pipeline, described baffling assembly comprises the multiple traverse baffles be fastened on described inner-walls of duct face, and described multiple traverse baffle is arranged in described pipeline along the flow direction of sodium aluminate solution.
According to an embodiment of the industrial coating system of titanium dioxide of the present invention, the straightened portion between described diluent supply-pipe and described coating reactor of described pipeline is arranged, two traverse baffles adjacent in described multiple traverse baffle are oppositely arranged, and form the passage flow through for sodium aluminate solution between adjacent two traverse baffles.
According to an embodiment of the industrial coating system of titanium dioxide of the present invention, described traverse baffle is fastened on described inner-walls of duct along the caliber direction of described pipeline, and the cross-sectional area of described traverse baffle is less than the cross-sectional area of described pipeline.
According to an embodiment of the industrial coating system of titanium dioxide of the present invention, the cross section of the part between described diluent supply-pipe and described coating reactor of described pipeline is circular, the large cyclotomy of shape for being formed after described circular dividing along the straight line being parallel to institute's pipe diameter direction of the cross section of described traverse baffle.
According to an embodiment of the industrial coating system of titanium dioxide of the present invention, the central angle of the arc of described large cyclotomy can be 240 ~ 270 °.
According to an embodiment of the industrial coating system of titanium dioxide of the present invention, described coating system also comprise to be arranged between described first-class gauge and described diluent supply-pipe and with the surge tank of described pipeline communication.
Compared with prior art, beneficial effect of the present invention comprises: the present invention's adopt low alkalinity sodium metaaluminate to carry out titanium white coating reduces acid consumption from source, reduces cost, decrease the pollution to environment, alleviate equipment corrosion, extend the work-ing life of equipment; And the low alkalinity sodium aluminate solution first configuring high density overcomes low alkalinity sodium metaaluminate shelf time of lower concentration short problem, then the mode adopting configuration limit, limit to use avoids in industrial production the problem of diluting the lower concentration low alkalinity sodium metaaluminate just hydrolysis inefficacy before use obtained, achieve the engineer applied adopting low alkalinity sodium metaaluminate to carry out titanium dioxide coating, and gained coated product performance index are better than existing commodity sodium metaaluminate coated product.
Accompanying drawing explanation
By the description carried out below in conjunction with accompanying drawing, above and other object of the present invention and feature will become apparent, wherein:
Fig. 1 shows the schematic diagram of the industrial coating system of the titanium dioxide of exemplary embodiment of the present.
Fig. 2 shows the schematic diagram of traverse baffle in the industrial coating system of the titanium dioxide of exemplary embodiment of the present.
Fig. 3 shows the dilution effect mimic diagram in the Part III of pipeline.
Description of reference numerals:
1-sodium aluminate solution storage tank, 2-first valve, the first-class gauge of 3-, 4-dashpot, 5-diluent supply-pipe, 6-second valve, 7-second gauge, 8-traverse baffle and 9-coating reactor.
Embodiment
Hereinafter, by the industrial coating method that describes in detail with exemplary embodiment by reference to the accompanying drawings according to titanium dioxide of the present invention and industrial coating system.
The industrial coating method of titanium dioxide comprises the following steps according to an exemplary embodiment of the present invention:
The sodium aluminate solution of compounding high concentration low alkalinity, n in the sodium aluminate solution of this high density low alkalinity
na2O: n
al2O3be 1.25 ~ 1.3, and the concentration of the sodium aluminate solution of this high density low alkalinity is with Al
2o
3count 300 ~ 350/L; The sodium aluminate solution of above-mentioned high density low alkalinity is diluted by pipeline and is delivered in Titanium dioxide slurry and carries out coating, the sodium aluminate solution of high density low alkalinity is diluted to its concentration with Al in pipe conveying procedure
2o
3count 95 ~ 105/L.
The sodium aluminate solution of above-mentioned compounding high concentration low alkalinity can realize in the following manner: preparation mass percentage concentration is the sodium hydroxide solution of 48 ~ 50% and is preheated to 80 ~ 100 DEG C; In sodium hydroxide solution, add aluminium hydroxide and be heated to boiling, treating that gained mixed solution becomes clarification gradually by muddiness, continuing to keep boiling 120 ~ 150min, obtain the sodium aluminate solution of above-mentioned high density low alkalinity.
Wherein, the process that mixed solution becomes clarification by muddiness reflects the process of reaction, becomes clarification representative reaction and substantially terminates, and clarifying the boil object of 120 ~ 150min of follow-up continuation of insurance is to form a more stable solution system, strengthens the stability of product.Control n in sodium metaaluminate
na2O: n
al2O3be 1.25 ~ 1.3 reason be, during aluminium hydroxide and alkali reaction belong to and reversible reaction, so sodium hydroxide concentration should be excessive, to improve reaction conversion ratio and to strengthen the stability of product at fluid conditions, if n
na2O: n
al2O3be less than 1.25, be difficult to react completely, and the sodium metaaluminate extremely unstable obtained, easily hydrolysis produces precipitation; And if n
na2O: n
al2O3be greater than 1.3, neutralize for a large amount of acid that still needs after titanium dioxide coating, do not reach expected effect.And high density sodium metaaluminate is (with Al
2o
3count 300 ~ 350/L) its shelf time can be extended, particularly, contriver has done correlative study for the preservation of low alkalinity sodium metaaluminate, and table 1 shows the preservation contrast and experiment of low alkalinity sodium metaaluminate, and wherein the modulus of sodium metaaluminate refers to n in sodium metaaluminate
na2O: n
al2O3mole ratio, the concentration of sodium metaaluminate is with Al
2o
3the concentration of meter.
The preservation contrast experiment of table 1 low alkalinity sodium metaaluminate
As can be seen from Table 1, when the concentration of low alkalinity sodium metaaluminate is 100g/L, the non-constant of its stability, produces a small amount of precipitation after 2 hours, and sodium metaaluminate lost efficacy; Concentration is that 200g/L produces a small amount of hydrolytic precipitation after 24 hours; When concentration is 300 ~ 350/L, as clear as crystal after 10 days, there is no the sign of hydrolysis and precipitation.Learn thus, control the concentration of low alkalinity sodium metaaluminate with Al
2o
3count 300 ~ 350/L and can preserve about 15 days, for industrial applications is laid a good foundation.
If directly adopt the sodium aluminate solution of above-mentioned high density that coating agent add-on will be caused to reduce, in coating process, dispersion effect is poor, causes partial concn too high, and self deposition easily occurs coating agent sodium metaaluminate, affect the effect that it is coated, therefore need during coating to adopt concentration with Al
2o
3count the lower concentration sodium aluminate solution of 95 ~ 105/L.As shown in Table 1, the sodium aluminate solution stability extreme difference of lower concentration low alkalinity, with Al
2o
3count effective shelf time of the low alkalinity sodium metaaluminate of 100g/L less than 2h, thus no matter be use after directly synthesizing the sodium aluminate solution of low alkalinity or the solution batches dilution of synthesis high density, all be difficult to industrially use, this is because the time of industrial use sodium metaaluminate is greater than 2h (comprising the joining day of sodium metaaluminate in a coating process and the churning time after adding), solution after the solution dilution of the sodium aluminate solution of direct synthesis low alkalinity or synthesis high density, through turning material, metering, in use procedure, sodium metaaluminate is just hydrolyzed, lost efficacy, can not re-use.
According to the present invention, the low alkalinity sodium aluminate solution first configuring high density overcomes low alkalinity sodium metaaluminate shelf time of lower concentration short problem, and adopts the using method that configuration limit, limit uses, and has ensured that it is ageing.Wherein, coating operation can be zirconium aluminium coating, sial coating, single aluminium coating etc.
Fig. 1 is the schematic diagram of the industrial coating system of the titanium dioxide of exemplary embodiment of the present, and Fig. 2 shows the schematic diagram of traverse baffle in the industrial coating system of the titanium dioxide of exemplary embodiment of the present.As shown in Figure 1, this industrial coating system sodium aluminate solution storage tank 1, dashpot 4 and coating reactor 9 of comprising diluent supply-pipe 5, first valve 2, second valve 6, first-class gauge 3, second gauge 7, baffling assembly and being connected successively by pipeline.
Wherein, sodium aluminate solution storage tank 1 for storing the sodium aluminate solution of above-mentioned high density low alkalinity, i.e. n in this sodium aluminate solution
na2O: n
al2O3be 1.25 ~ 1.3, and the concentration of sodium aluminate solution is with Al
2o
3count 300 ~ 350/L.Coating reactor 9 comprises four coating tanks, its separately in splendid attire need the Titanium dioxide slurry of coating.First valve 2 and first-class gauge 3 are successively set in the first part between sodium metaaluminate storage tank 1 and dashpot 4 of pipeline according to the flow direction of sodium aluminate solution.Diluent supply-pipe 5 is communicated with the second section between dashpot 4 and coating reactor 7 of pipeline, to be passed into by diluent (such as water) in pipeline and to mix with sodium aluminate solution, and then sodium aluminate solution is diluted to its concentration with Al
2o
3count 95 ~ 100g/L.Second valve 6 and second gauge 7 are successively set on diluent supply-pipe 5 according to the flow direction of diluent.Baffling assembly is arranged in the Part III between diluent supply-pipe 5 and coating reactor 9 of pipeline, baffling assembly comprises the multiple traverse baffles 8 (such as four) be fastened on inner-walls of duct face, and multiple traverse baffle 8 is arranged in the duct along the flow direction of sodium aluminate solution.As shown in Figure 1, the Part III of pipeline is vertically arranged, and two traverse baffles adjacent in multiple traverse baffle 8 are oppositely arranged, and forms the passage flow through for sodium aluminate solution between adjacent two traverse baffles.Preferably, traverse baffle 8 is fastened on inner-walls of duct along the caliber direction of pipeline, and the cross-sectional area of traverse baffle 8 is less than the cross-sectional area of pipeline, in the present embodiment, the cross section of the Part III of pipeline is circular, as shown in Figure 2, the shape of the cross section of traverse baffle 8 for along the straight line being parallel to institute's pipe diameter direction by the large cyclotomy in the large cyclotomy that formed after circular dividing and little cyclotomy, the central angle of the arc of large cyclotomy can be 240 ~ 270 °, namely the α angle in Fig. 1 is 90 ~ 120 °, thus make the mixed diluting better effects if of diluent and sodium aluminate solution.Certainly the present invention is not limited thereto, the object arranging baffling assembly is that the dilution Blending Efficiency of Blending of the sodium aluminate solution making diluent and high density low alkalinity is good, the sodium aluminate solution flowed in coating reactor is made to reach expection requirement, thus the distance etc. between the cross-sectional area of the quantity of traverse baffle, traverse baffle, traverse baffle can be selected according to practical situation, and the set-up mode of traverse baffle is also not limited to arrange along pipe diameter direction, and all right downward-sloping certain angle is so that the flowing of liquid.
In the present embodiment, contriver adopts the dilution effect in the setting of Ansys13.0 software simulation traverse baffle and pipeline Part III, finally determine that the caliber of pipeline is 130mm, the central angle of the arc of the large cyclotomy of traverse baffle is 240 °, namely the α angle in figure is 120 °, the quantity of traverse baffle is 4, and adjacent baffle is 250mm along the distance of pipe lengths.Fig. 3 is the dilution effect mimic diagram in the Part III of pipeline.And, contriver has also carried out analysis of experiments to the dilution effect after the industrial coating system of the above-mentioned titanium dioxide of industrial application, the sodium metaaluminate flow velocity of high density low alkalinity is arranged about 548.6L/h, the flow velocity of water is set to 1371L/h, sample in one end that pipeline is connected with coating reactor and detect the concentration of gained sodium aluminate solution, table 2 shows the dilution effect detected result of high density low alkalinity sodium metaaluminate.
The dilution effect of table 2 high density low alkalinity sodium metaaluminate
| Sample time, min | 10 | 20 | 30 | 40 | 50 | 60 |
| The concentration of sodium aluminate solution is (with Al 2O 3Meter), g/L | 101 | 99 | 109 | 110 | 102 | 105 |
As can be seen from Fig. 3 and table 2, after adopting the industrial coating system of above-mentioned titanium dioxide, high density low alkalinity sodium metaaluminate dilution Blending Efficiency of Blending is in the duct good, has reached pre-provisioning request when delivering to coating tank.
In order to understand above-mentioned exemplary embodiment of the present invention better, below in conjunction with concrete example and comparative example, it is further described.
example
This example adopts above-mentioned industrial coating system to carry out zirconium aluminium coating, specifically comprises following operation:
The sodium aluminate solution of a, preparation high density low alkalinity.
Solid aluminum hydroxide and water are configured to the liquid caustic soda that mass percentage concentration is 48%, or direct existing mass percentage concentration is the liquid caustic soda of 48%, gets 1.23m
3be placed in 5m
3titanium material reactor in and be preheated to 90 DEG C; Under well-beaten condition, add aluminium hydroxide, adding system temperature is 80 DEG C, and the add-on of aluminium hydroxide is 1.6 tons; Heating systems is warming up to boiling, treats that system becomes clarification gradually by muddiness, keeps system boiling 120min, the high density low alkalinity sodium aluminate solution prepared cooling is sealed in sodium aluminate solution storage tank 1, stand-by.
B, calculate the sodium metaaluminate consumption needed for coating according to the gauge of the titanium white slurry in coating reactor, and to calculate the high density low alkalinity sodium aluminate solution dilution prepared by step a be that 95 ~ 105g/L is (with Al
2o
3meter) needed for the water yield and flow velocity.
C, open the first valve 2 and the second valve 6 as required, and the aperture of the first valve 2 and the second valve 6 is regulated according to the monitoring data of first-class gauge 3 and second gauge 7, with the flow of the flow and diluting water that control high density low alkalinity sodium aluminate solution, thus sodium aluminate solution is made in the pipeline with traverse baffle 8, to form 100g/L (with Al with water dilution mixture in the process being delivered to coating reactor 9
2o
3meter) lower concentration low alkalinity sodium aluminate solution.
D, coating process concrete steps are as follows:
1. charging: will treat that the Titanium dioxide slurry of coating adds in coating tank, the TiO in this Titanium dioxide slurry
2concentration is 280 ~ 300g/L, the total TiO of batch coating
2amount 16t, the Sodium hexametaphosphate 99 added, the add-on of Sodium hexametaphosphate 99 is with P
2o
5count TiO in Titanium dioxide slurry
20.3% of quality, pH value is 9.0 ~ 10.0, is warmed up to 45 ~ 50 DEG C.
2. zirconium sulfate is added: the concentration of zirconium sulfate is with ZrO
2count 100g/L, the add-on of zirconium sulfate is with ZrO
2count TiO in Titanium dioxide slurry
20.4% of quality, the flow velocity of zirconium sulfate arranges about 768L/h, and the joining day is 50min, the temperature of slurry 45 ~ 50 DEG C, stirs 40min, the pH value 2.0 ~ 3.0 of slurry.
3. Tai-Ace S 150 is added: the concentration of Tai-Ace S 150 is 100g/L, and add-on is TiO in Titanium dioxide slurry
20.5% of quality, feed time 30min, flow velocity arranges about 1600L/h, temperature 55 ~ 60 DEG C, stirs 15min, slurry pH value 2.2 ~ 2.5.
4. the sodium metaaluminate of the lower concentration low alkalinity obtained according to the mode of above-mentioned steps a to c is added, wherein, the sodium metaaluminate flow velocity of high density low alkalinity arranges about 685.7L/h, and water flow velocity arranges 1714L/h, coating with the theoretical addition amount of lower concentration low alkalinity sodium metaaluminate with Al
2o
3count TiO in Titanium dioxide slurry
20.5% of quality, feed time 20min, the temperature 60 C of slurry, stir 30min, the pH value 3.2 ~ 3.5 of slurry is (because every batch of sodium metaaluminate raw material added fluctuates to some extent, thus on the basis of theoretical addition amount, the actual add-on of sodium metaaluminate can be controlled according to pH value).
5. the sodium metaaluminate of the lower concentration low alkalinity obtained according to the mode of above-mentioned steps a to c is added, wherein, the sodium metaaluminate flow velocity of high density low alkalinity arranges about 396.2L/h, and water flow velocity arranges 990.5L/h, coating by the add-on of lower concentration low alkalinity sodium metaaluminate with Al
2o
3count TiO in Titanium dioxide slurry
21.3% of quality, feed time 90min, the temperature 60 C of slurry, stirs 40min, the pH value 9.5 ~ 9.8 of slurry.
6. add Tai-Ace S 150: the concentration of Tai-Ace S 150 is 100g/L, the theoretical addition amount of Tai-Ace S 150 is TiO in Titanium dioxide slurry
20.2% of quality, feed time 20min, flow velocity arranges about 960L/h, and the temperature of slurry is 60 DEG C, stirs 60min, the pH value 7.2 ~ 7.6 (controlling the actual add-on of Tai-Ace S 150 according to pH value) of slurry.
7. filtration washing, dries, and pulverizes, obtains titanium dioxide coated product.
As can be seen from the step of above-mentioned example 4. and 5., the duration of service of the sodium metaaluminate of lower concentration low alkalinity is " feed time 20min+ stirs 30min+ feed time 90min+ and stirs 40min > 2h ", thus, for effective shelf time less than the lower concentration low alkalinity of 2h sodium aluminate solution for, be no matter directly synthesize low alkalinity sodium aluminate solution or the solution of synthesis high density use by after batch dilution, all be difficult to industrially use, and the mode adopting the low alkalinity sodium aluminate solution first synthesizing high density of the present invention to be used by ducting side configuration limit more successfully overcomes the industrial application problem that lower concentration low alkalinity sodium aluminate solution carries out titanium white coating.
Comparative example
This comparative example adopts commodity sodium metaaluminate to carry out coating, specifically comprises following operation:
1. charging: will treat that the Titanium dioxide slurry of coating adds in coating tank, the TiO in this Titanium dioxide slurry
2concentration is 280 ~ 300g/L, the total TiO of batch coating
2amount 16t, the Sodium hexametaphosphate 99 added, the add-on of Sodium hexametaphosphate 99 is with P
2o
5count TiO in Titanium dioxide slurry
20.3% of quality, pH value is 9.0 ~ 10.0, is warmed up to 45 ~ 50 DEG C.
2. zirconium sulfate is added: the concentration of zirconium sulfate is with ZrO
2count 100g/L, the add-on of zirconium sulfate is with ZrO
2count TiO in Titanium dioxide slurry
20.4% of quality, the joining day is 50min, the temperature of slurry 45 ~ 50 DEG C, stirs 40min, the pH value 2.0 ~ 3.0 of slurry.
3. Tai-Ace S 150 is added: the concentration of Tai-Ace S 150 is 100g/L, and add-on is TiO in Titanium dioxide slurry
21.0% of quality, feed time 30min, temperature 55 ~ 60 DEG C, stirs 15min, slurry pH value 2.2 ~ 2.5.
4. add commodity sodium metaaluminate coating, the theoretical addition amount of commodity sodium metaaluminate is with Al
2o
3count TiO in Titanium dioxide slurry
20.4% of quality, feed time 20min, the temperature 60 C of slurry, stir 30min, the pH value 3.2 ~ 3.5 of slurry is (because every batch of sodium metaaluminate raw material added fluctuates to some extent, thus on the basis of theoretical addition amount, the actual add-on of sodium metaaluminate can be controlled according to pH value).
5. add commodity sodium metaaluminate coating, the theoretical addition amount of industrial sodium metaaluminate is with Al
2o
3count TiO in Titanium dioxide slurry
21.0% of quality, feed time 90min, the temperature 60 C of slurry, stirs 40min, the pH value 9.5 ~ 9.8 of slurry.
6. add Tai-Ace S 150: the concentration of Tai-Ace S 150 is 100g/L, the theoretical addition amount of Tai-Ace S 150 is TiO in Titanium dioxide slurry
20.2% of quality, feed time 20min, flow velocity arranges about 960L/h, and the temperature of slurry is 60 DEG C, stirs 60min, the pH value 7.2 ~ 7.6 (controlling the actual add-on of Tai-Ace S 150 according to pH value) of slurry.
7. filtration washing, dries, and pulverizes, obtains titanium dioxide coated product.
Following table 3 gives the coated product performance of above-mentioned example and comparative example gained, and compares with existing commodity sodium metaaluminate coated product performance.Wherein, numbering 1 represents commodity sodium metaaluminate coated product, and numbering 2 represents the coated product of above-mentioned example gained.
The bag sial film product that table 3 commodity sodium metaaluminate obtains and the Performance comparision of example products obtained therefrom
| Numbering | L | a | b | Blue Whiteness | Whiteness index | Jasn |
| 1 | 98.07 | -0.41 | 2.32 | 93.27 | 84.82 | 94.65 |
| 2 | 98.23 | -0.43 | 2.39 | 93.65 | 84.95 | 94.59 |
| Numbering | TCS | Scx | Ton | Al 2O 3/％ | Al 2O 3Deposition/% | |
| 1 | 1950 | 3.56 | -8.41 | 2.0 | 80 | |
| 2 | 1960 | 3.59 | -8.67 | 1.9 | 78 |
As can be seen from the above table, in industrial application, low alkalinity sodium metaaluminate coated product whiteness is better than commodity sodium metaaluminate coated product, and the deposition of other pigment performances (such as, reducing power Tcs, brightness Jasn, tone Ton and blue phase spectral value Scx) and aluminium and commodity sodium metaaluminate coated product no significant difference.
In sum, the present invention adopts the low alkalinity sodium aluminate solution that first configures high density with the low alkalinity sodium metaaluminate shelf time overcoming lower concentration short problem, then the mode used by ducting side configuration limit is adopted to avoid the problem of lower concentration low alkalinity sodium metaaluminate just hydrolysis inefficacy before use, achieve the engineer applied adopting low alkalinity sodium metaaluminate to carry out titanium dioxide coating, the consumption of acid is reduced from source, reduce cost, decrease the pollution to environment, alleviate equipment corrosion, extend the work-ing life of equipment, and gained coated product performance index are better than existing commodity sodium metaaluminate coated product.
Although above by describing the present invention in conjunction with exemplary embodiment, it will be apparent to those skilled in the art that when not departing from the spirit and scope that claim limits, various amendment and change can be carried out to exemplary embodiment of the present invention.
Claims (10)
1. an industrial coating method for titanium dioxide, is characterized in that, described coating method comprises the following steps:
Preparation sodium aluminate solution, n in described sodium aluminate solution
na2O: n
al2O3be 1.25 ~ 1.3, and the concentration of described sodium aluminate solution is with Al
2o
3count 300 ~ 350/L;
Described sodium aluminate solution is diluted by pipeline and is delivered in Titanium dioxide slurry and carries out coating, wherein, described sodium aluminate solution is diluted to its concentration with Al
2o
3count 95 ~ 105/L.
2. the industrial coating method of titanium dioxide according to claim 1, is characterized in that, the step of described preparation sodium aluminate solution comprises:
Preparation mass concentration is the sodium hydroxide solution of 48 ~ 50%;
In described sodium hydroxide solution, add aluminium hydroxide and be heated to boiling, treating that gained mixed solution becomes clarification gradually by muddiness, continuing to keep boiling 120 ~ 150min, obtain described sodium aluminate solution.
3. the industrial coating method of titanium dioxide according to claim 1, is characterized in that, is provided with baffling assembly in described pipeline.
4. an industrial coating system for titanium dioxide, is characterized in that, described coating system comprises diluent supply-pipe, the first valve, the second valve, first-class gauge, second gauge, sodium aluminate solution storage tank and coating reactor, wherein,
Sodium aluminate solution is had, n in described sodium aluminate solution in described sodium aluminate solution storage tank
na2O: n
al2O3be 1.25 ~ 1.3, and the concentration of described sodium aluminate solution is with Al
2o
3count 300 ~ 350/L;
In described coating reactor, splendid attire needs the Titanium dioxide slurry of coating, and is connected with described sodium aluminate solution storage tank by pipeline;
Described diluent supply-pipe and described pipeline communication, to pass into diluent in described pipeline and described sodium aluminate solution be diluted to its concentration with Al
2o
3count 95 ~ 105/L;
Described first valve and first-class gauge are successively set in the part between sodium metaaluminate storage tank and diluent supply-pipe of described pipeline according to the flow direction of sodium aluminate solution;
Described second valve and second gauge are successively set on described diluent supply-pipe according to the flow direction of diluent.
5. the industrial coating system of titanium dioxide according to claim 4, it is characterized in that, baffling assembly is provided with in the part between described diluent supply-pipe and described coating reactor of described pipeline, described baffling assembly comprises the multiple traverse baffles be fastened on described inner-walls of duct face, and described multiple traverse baffle is arranged in described pipeline along the flow direction of sodium aluminate solution.
6. the industrial coating system of titanium dioxide according to claim 5, it is characterized in that, the straightened portion between described diluent supply-pipe and described coating reactor of described pipeline is arranged, two traverse baffles adjacent in described multiple traverse baffle are oppositely arranged, and form the passage flow through for sodium aluminate solution between adjacent two traverse baffles.
7. the industrial coating system of titanium dioxide according to claim 6, is characterized in that, described traverse baffle is fastened on described inner-walls of duct along the caliber direction of described pipeline, and the cross-sectional area of described traverse baffle is less than the cross-sectional area of described pipeline.
8. the industrial coating system of titanium dioxide according to claim 7, it is characterized in that, the cross section of the part between described diluent supply-pipe and described coating reactor of described pipeline is circular, the large cyclotomy of shape for being formed after described circular dividing along the straight line being parallel to institute's pipe diameter direction of the cross section of described traverse baffle.
9. the industrial coating system of titanium dioxide according to claim 8, is characterized in that, the central angle of the arc of described large cyclotomy is 240 ~ 270 °.
10. the industrial coating system of titanium dioxide according to claim 4, is characterized in that, described coating system also comprise to be arranged between described first-class gauge and described diluent supply-pipe and with the surge tank of described pipeline communication.
Priority Applications (1)
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|---|---|---|---|
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| CN101235223A (en) * | 2008-03-05 | 2008-08-06 | 攀钢集团攀枝花钢铁研究院有限公司 | High water dispersity titanium dioxide and coating method thereof |
| CN201543412U (en) * | 2010-02-22 | 2010-08-11 | 河南佰利联化学股份有限公司 | Reactor used for surface coating of rutile type titanium dioxide |
| CN103555001A (en) * | 2013-10-31 | 2014-02-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for coating titanium dioxide |
| CN103756367A (en) * | 2013-11-12 | 2014-04-30 | 漯河兴茂钛业股份有限公司 | Preparation method of novel coated anatase titanium dioxide |
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| CN101235223A (en) * | 2008-03-05 | 2008-08-06 | 攀钢集团攀枝花钢铁研究院有限公司 | High water dispersity titanium dioxide and coating method thereof |
| CN201543412U (en) * | 2010-02-22 | 2010-08-11 | 河南佰利联化学股份有限公司 | Reactor used for surface coating of rutile type titanium dioxide |
| CN103555001A (en) * | 2013-10-31 | 2014-02-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for coating titanium dioxide |
| CN103756367A (en) * | 2013-11-12 | 2014-04-30 | 漯河兴茂钛业股份有限公司 | Preparation method of novel coated anatase titanium dioxide |
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