Methods for preparing and using crystal seeds of rutile in high activity
A rutile and high-activity technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of reduced efficiency, low seed crystal activity, and increased power consumption, and achieve the goal of reducing alkali consumption, increasing activity, and improving efficiency Effect
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Embodiment 1
[0017] Take 500ml of metatitanic acid with a concentration of 280g / l and heat it to 65°C for later use. After heating 320ml of sodium hydroxide solution with a concentration of 700g / l to 90°C, add the preheated metatitanic acid evenly into the Alkali dissolution is carried out in sodium hydroxide solution under constant stirring, the ratio of alkali to titanium is 1.6:1, after the addition is completed, the temperature is raised to boil and kept boiling for 120 minutes. Stop heating after the alkali dissolution is completed, add 140g of water and cool the alkali soluble matter to 70°C with a cooling device. Filtrate once and wash with water until the NaOH content in the washing liquid is 5g / l. Add water to the filter cake to make a slurry with a concentration of 180g / l, then add hydrochloric acid to adjust the acid, adjust the pH to 2.4, place it under stirring at 20°C for 8 hours, then filter it twice, wash with water until the conductivity of the washing liquid is 300 μS / cm ...
Embodiment 2
[0019] Rutile seed crystals were prepared as in Example 1, except that the alkali-titanium ratio during alkali dissolution was 1.2:1, that is, the concentration of 700 g / l of sodium hydroxide solution was 240 ml. The detection indexes of the prepared rutile seed crystals are shown in Table 1, and the application properties are shown in Table 2.
Embodiment 3
[0021] The rutile seed crystals were prepared as in Example 1, except that the concentration of metatitanic acid was 250 g / l and the volume was 560 ml during alkali dissolution. The detection indexes of the prepared rutile seed crystals are shown in Table 1, and the application properties are shown in Table 2.
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