Method advantages than gas phase method, liquid phase method, titanyl sulfate and titanium tetrachloride most industrial chemical precipitation potential. Combined with the advantages of China's sulfuric acid method titanium dioxide manufacturers, mature technology and rich experience, it is more advantageous to develop liquid phase titanyl sulfate chemical precipitation method to produce nano-TiO 2 . As for the scale of production, the demand for nano-TiO 2 in China is considered to be around 10,000 tons/year; some people think it is below 1,000 tons/year. The author believes that the latter view may be more in line with domestic realities. In this way, the domestic nano-TiO 2 production capacity has been able to meet the needs of the existing market. However, with the popularity of nano-TiO 2 and the change of people's consumption concept and the rapid and steady development of China's overall economy, nano-TiO 2 will usher in a broader market space.
The chemical precipitation method can be divided into a uniform precipitation method, a direct precipitation method, and a coprecipitation method. The uniform precipitation method has the characteristics of simple process, good product quality and easy operation, and is a preparation method with the most industrial development prospect. Evenly released, in this method, the precipitant added to the solution does not immediately react with the precipitated component, but the chemical reaction causes the precipitant to slowly form in the entire solution, so that the precipitate is slowly formed by the chemical reaction in the solution. As long as the speed of generating the precipitant is controlled, the concentration unevenness can be avoided, the supersaturation can be controlled within an appropriate range, thereby controlling the growth rate of the particles, and obtaining nanoparticles with uniform, compact, easy washing and high purity. Commonly used uniform precipitants are urea and the like. The reaction principle of preparing titanium TiO 2 with titanium oxysulfate as precursor and urea as precipitant is that urea aqueous solution starts to hydrolyze at about 70 ° C. The reaction formula is as follows:
CO(NH 2 ) 2 +3H 2 O===2NH 3 ·H 2 O+CO 2 ↑
Since the decomposition rate of urea is controlled by the heating temperature and the urea concentration, the urea decomposition rate can be lowered to a low level to obtain nano TiO 2 having a uniform particle size distribution and a small particle diameter. The decomposition products of urea, CO 2 and NH 3 , are gases after reaction or calcination, which are volatile and do not affect the purity and quality of the product. The precipitated agent NH 3 ·H 2 O is uniformly distributed in the TiOSO 4 solution, and the concentration is low, so that the precipitate TiO(OH) 2 is uniformly formed, and the reaction formula is as follows
TiOSO 4 +2NH 3 ·H 2 O===TiO(OH) 2 ↓+(NH 4 ) 2 SO 4
TiO(OH) 2 ===TiO 2 +H 2 O
Crushing Equipment Series
Crushing equipment series are machines that are used to crush and grind various materials. These machines are commonly used in the mining and construction industries to reduce the size of raw materials for further processing. The crushing equipment series includes jaw crushers, impact crushers, cone crushers, and gyratory crushers.
Jaw crushers are the most commonly used type of crushing equipment in the mining and construction industries. They are designed to crush large rocks and other materials into smaller pieces. The jaw crusher consists of a fixed jaw plate and a moving jaw plate. The material is crushed by the movement of the moving jaw plate against the fixed jaw plate.
Impact crushers are used to crush materials that are not too hard or abrasive. They are commonly used in the construction industry to crush concrete, asphalt, and other materials. The impact crusher consists of a rotor that rotates at high speed and a feed chute. The material is fed into the feed chute and is then crushed by the rotating rotor.
Cone crushers are used to crush materials that are hard and abrasive. They are commonly used in the mining industry to crush ore and rock. The cone crusher consists of a mantle and a concave bowl. The material is fed into the bowl and is then crushed by the mantle as it gyrates around the bowl.
Gyratory crushers are similar to cone crushers but have a different shape. They are commonly used in the mining industry to crush ore and rock. The gyratory crusher consists of a mantle that gyrates inside a concave bowl. The material is fed into the bowl and is then crushed by the gyrating mantle.
In conclusion, crushing equipment series are essential machines in the mining and construction industries. They are designed to crush and grind various materials into smaller pieces for further processing. The different types of crushing equipment include jaw crushers, impact crushers, cone crushers, and gyratory crushers. Each type of crusher has its own unique features and is used for specific applications.
Crushing Equipment Series,Meat Grinder,Rock Crusher Machine,Giant Crusher
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