Metatitanic directly coated rutile titanium dioxid

Metatitanic directly coated rutiletitanium dioxide production Abstract: In this study,we will use new technology and processes which is that envelope will be coated after the washing and bleaching process of metatitanic ,and pure metatitanic will be directly to be coated, then we can get the titanium dioxide product after calcination and smashing. and we argue calcined temperature, calcination time, the capsule temperature, pH, coating time, coating amount, coating speed and other variables to get the best parameters to do multiple sets of samples were compared, can initially come to be seen, in terms of color compared to the traditional process of the new process titanium dioxide products, white , brightness, the blue spectral characteristics of value achromatic power, tone (absolute) performance is better than the traditional process. And proved by experiments to the TMP organic coated optical properties of titanium dioxide some improvement. Test results from the microscopic point of view can be seen, the new technology prepared rutile titanium dioxide crystal form, particle size and morphology, with the traditional process is not very different, so you can initially come to the conclusion that new technology is highly feasible.Key words: titanium dioxide, dispersed, envelope ,calcination, smashIntroduction :Titanium dioxide in its crystalline form is divided into three main types : anatase , rutile and titanium plate [1] , due to the unstable titanium plate , there is no practical value in real life . The anatase titanium dioxide does not require an envelope , so rutile titanium dioxide is one of the world's best white inorganic pigment . Titanium dioxide is a white inorganic pigment , coupled with its chemical stability, chemically inert , almost no reaction with other substances at room temperature , oxygen , nitrogen , ammonia , hydrogen sulfide, are stable , and different water, fat , organic acids and weak inorganic acids. And titanium dioxide have high coverage , high refractive index , with a non-toxic, high opacity , whiteness and brightness are the best , is recognized as the best performance of a contemporary inorganic white pigment widely used in paints , plastics , paper, printing ink , chemical fiber , rubber, ceramics, cosmetics and food additives and pharmaceutical industries . The optical properties and pigment properties are closely related to the nature of the particular form of the pigment optical properties , all of the basic properties of the pigment has the effect of hiding pigment , such as hiding power, color strength, gloss , hue, weathering resistance , etc., are is the result of optical effects .The development of China's titanium dioxide industry late in 1955 began studies of titanium dioxide sulfuric acid method. Subsequent years beginning with sulfuric acid production anatase titanium dioxide, 1967 initial grasp rutile titanium dioxide sulfuric acid production technology. However, due to backward technology development is very slow. The latter, due to the rapid increase in the world demand for titanium dioxide, and the domestic economy, the country built more than 100 sulfate process titanium dioxide plant in the 1980s [2]. By the late 1990s, titanium dioxide productivity reached 180,000 tons. At present, China's titanium dioxide industry has been gradually rising, particularly in Panzhihua Titanium represented by large state-owned enterprises, thoroughly implement the scientific concept of development, seize opportunities, difficulties, breaking multiple technical obstacles, the country's tradition of titanium dioxide industry also pushed to a new vantage point.1.Experimental Materials and Methods1.1Experimental MaterialsThe use of rutile titanium dioxide production plant metatitanic as raw material, which is the result of metatitanic washed, bleached and processed salt is added accelerator and rutile crystal modifier after metatitanic.Metatitanic theoretical formula:32TiO H ,Actually is 2TiO ·X O H 2·Y 3SO .A typical factory production metatitanic chemical composition as shown in Table 1.1: Table 1.1Ingredient 2TiO O H 23SO 32O Fe 32O Sb 32O Al ZnO Content,% 3562 3 0.001 0.007 0.004 0.004 Metatitanic slurry 2TiO concentration should be measured and calculated by the following formula:2TiO Content （g/L ）= (d -1) ×1190 The relative density of the slurry metatitanic （g/mL ）Generally 1.16 – 1.27.1190：Experimental constants.2TiO Content Generally 200 – 320 g/L.The experiment was actually used by the partial vacuum filtration titanate, moisture content of about 49%-50%.Can be estimated 3SO 3% 2TiO Content 48%.The main drugs include: metatitanic six series, sodium citrate, sodium silicate, sodium hydroxide, sodium aluminate, concentrated sulfuric acid, aluminum sulfate, zirconium sulfate.① beaker several (5000ml, 2000ml, 500ml, 250ml, 100ml, 50ml), medium-speedqualitative filter paper several glass rod, 15cm.② dropper, pH test strips, PH meter, a mortar, a 523 mesh sieve.③ an electronic balance with an accuracy of 0.1g.④ dispersed phase: GFJ-0.4 high-speed centrifugal dispersing machine, the maximum speed of 8000r/min, 2l cylinder, Shanghai Modern Environmental Engineering Technology Co., Ltd.; JJ-1 booster Precision electric mixer.⑤ sanding stages: liters sander.⑥ envelope phases: the envelope slot, constant flow pump.⑦filtration and drying stage: SHB-111T multi-purpose water circulating pump, shown in Figure 4.7; filtration bottles; 101 electric blast oven (110 ℃).⑧ calcination stages: resistance furnace.⑨ crushing stages: superfine jet mill 0.5-2KG / H, compressor 1.2MPa, refrigeration dryer.1.2 Experimental MethodsA. direct calcination metatitanic not coated.B. metatitanic first calcined alumina coated again.C. after the first metatitanic coated alumina, and then calcined.Calcined strength above are: 510 ℃ -710 ℃ heat insulation 2 hours 2 hours -810 ℃for 3 hours, calcination time of 7 hours.1.2.2 coated aluminum zirconium ideasA. direct calcination metatitanic not coated.B. metatitanic first calcined and then coated aluminum zirconium.After the C, partial coated aluminum zirconium titanate first, and then calcined. Calcined strength above are: 510 ℃ -710 ℃ heat insulation 2 hours 2 hours -810 ℃for 3 hours, calcination time of 7 hours.1.2.3 wet and dry methods of organic coatedA. directly in the tank by adding TMP envelope bag film, reaction time, conduct air smash.B. when added to the jet mill TMP package film, in order to achieve the effect of organic coated.2.Results and discussion2.1 color contrastAchromatic power refers to the titanium dioxide pigment used as a coloring agent, its own color to make colored substance has the ability to color. The higher the value, thebetter. Achromatic power analysis shown in Figure 2.1.1:Figure 2.1.1 Sample achromatic power chart Figure 2.1.2 Sample charts blue spectral characteristic values Figure 2.1.1 shows that new technology products (S.2, S.4, S.6) achromatic power are higher than traditional craft products (S.1, S.3, S.5), and temperature control incubated at 510 ℃2 小时-710 ℃-810 ℃for 2 hours for 3 hours, calcination time of 7 hours, and after the organic coated achromatic power for the best.Blue spectral characteristics of high value indicates blue phase, reducing the value of said yellow phase. Charts blue spectrum of eigenvalues shown in Figure 2.1.2: Figure 2.1.2 shows that the thermostat was kept at 510 ℃2 小时-710 ℃-810 ℃for 2 hours for 3 hours, a total of seven hours of calcination time coated aluminum zirconium new technology products, the value of the best blue-phase spectral characteristics.The higher the absolute tone, said the red phase, the less said the green phase. Tone of the absolute value of each sample chart shown in Figure 2.1.3:Figure 2.1.3 tones absolute value chart Figure 5.1.4 Sample brightness chart Figure 2.1.3 shows that the absolute value of the new technology hue little difference with the traditional process, are relatively low, which was green phase, and new technology products coated aluminum zirconium tones (absolute value) with the traditional craft products almost enveloped .Mapping the luminance uniformity of the particles, if the uniformity of the titanium dioxide is higher, the higher the value. The luminance of each sample as shown in FIG Tongji 2.1.4 below:Figure 2.1.4 shows that the brightness of new technology products is relatively stable,does not appear as the highest or lowest traditional process, the luminance value of the new technology better stability than the traditional process.The higher the whiteness of titanium dioxide, titanium dioxide performance is more excellent. Whiteness each sample chart shown in Figure 2.1.5:Figure 2.1.5 Sample whiteness chart Figure 2.1.6 Sample Oil Absorption charts Can clearly be seen from Figure 2.1.5, S.1, S.3, S.5 as whiteness is significantly lower than the traditional process of new technology S.2, S.4, S.6 whiteness values. Figure 2.1.6 shows that the new technology with the traditional process was essentially flat in the oil absorption index; lower oil absorption of titanium dioxide, it shows the better performance of the sample, we can see from the figure, zirconium samples S.6 aluminum coated lowest oil absorption of new technology products. It can initially be seen, the effect of the new technology compared to traditional techniques well coated, capsule, the better, the lower oil absorption.In summary, we can see that the optical performance of the new process for preparing coated rutile titanium dioxide is superior to the conventional preparation process. Integrated optical performance and can be seen for the sample S.6 best.3.ConclusionIn summary , we can draw the following conclusions :( 1 ) new technology products titanium dioxide color compared to the traditional process , the new process sample S.2, S.4, S.6 whiteness , brightness, blue spectral characteristic values achromatic power , tone ( absolute value ) and so the overall performance is better than the traditional process samples S.1, S.3, S.5, only a very few indicators may lower than the traditional process , but the overall trend is a new technology product is superior to the traditional process, and the new technology is a sample of six samples S.6 optimal performance . New technology coupled with simple process, so you can initially demonstrate the feasibility of new technology is relatively high .( 2 ) the sample by comparing the sample S.5 S.6, through the optical properties of the organic coated sample S.6 TMP is superior to organic coated sample without the TMP S.5, can initially concluded that organic can improve the optical properties of coated titanium dioxide .( 3 ) the particle size of titanium dioxide products, new technology , compared with the traditional process , the focus particle size segment , there is not much difference, are concentrated in the 0.7um-0.9um between , but can clearly be seen from theparticle size distribution , the traditional process there is a reunion interval , this can be a preliminary description of the new technology for preparing coated rutile titanium dioxide dispersion is superior to the traditional process. We can initially conclude that the new technology compared to the traditional process , compared with better dispersion , help to improve the overall performance of a variety of titanium dioxide .( 4 ) Oil absorption charts from each sample , we can see that the new technology sample S.2, S.4, oil absorption S.6 slightly less than the traditional process . This result illustrates that the new technology can improve the oil absorption of titanium dioxide , to improve the performance of such titanium dioxide .( 5 ) from the SEM photograph can be drawn titanium dioxide products and new technology on the microstructure of the traditional process is basically no difference ; From the XRD diffraction pattern can be derived new technology and traditional craft products in the phase composition , and the proportion of polymorphs consistent ; this can be explained from the micro level, the new process of preparation of rutile titanium dioxide morphology and crystal form of titanium dioxide can meet the basic requirements to achieve our desired effect .Therefore, the preliminary results of the feasibility of partial titanate directly coated titanium dioxide rutile preparation is relatively high .4. AcknowledgementsFirst, thanks to Wang Xihua University of Foreign Languages for guiding us in terms of academic writing, from Wang's rigorous work attitude, we have learned the basic qualities of a scientific research workers, and secondly to thank my graduate design instructor Zou instructor experiments and papers I've done.5. References[1] Chen Zhaohua, Liu Chang and titanium dioxide production and application technology [M], Beijing: Chemical Industry Press, 2006[2] Wei Shaodong, about technology innovation and development of titanium dioxide [J]. 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