保定钛白粉厂

提高和稳定钛白粉白度的主要途径

Main ways to improve and stabilize whiteness of titanium dioxide

 

 

钛白粉的白度影响因素很多，有矿源的影响，也有设备和关键技术的影响。通过试验和现场经验，影响其白度的主要因素有：水解质量，杂质元素的清除和煅烧条件。

The whiteness of titanium dioxide is influenced by many factors, including the influence of mineral resources, and the influence of equipment and key technologies. Through experiments and field experience, the main factors affecting the whiteness are hydrolysis quality, removal of impurities and calcination conditions.

 

 

钛白粉的水解技术，目前国内有加压水解和常压水解两种技术，从水解质量和产品质量来分析，常压水解质量较好，水解粒径均匀。要保证水解质量，必须严把浓钛液质量指标，控制铁钛比和固含量在规定范围内，同时加大水解工艺操作条件的控制。

Pressure hydrolysis and atmospheric hydrolysis are two kinds of hydrolysis technology of titanium dioxide in China. Analyzing the hydrolysis quality and product quality, atmospheric hydrolysis quality is better and the hydrolysis particle size is uniform. In order to ensure the quality of hydrolysis, it is necessary to strictly control the quality index of concentrated titanium solution, control the ratio of iron to titanium and the solid content within the prescribed range, and increase the control of the operation conditions of hydrolysis process.

 

 

影响钛白粉白度的另外一个主要因素是一些杂质有色元素，例如：铁、钴、镍等，必须采取一定的措施进行清除，对于锐钛型钛白粉，高铁含量在120ppm时，影响其白度，甚至发生光色互变现象。采用漂白技术，加大高铁的洗涤力度，同时加一些掩蔽剂，例如：三氧化二锑和磷酸，来对铁进行络合掩蔽，降低杂质元素对钛白粉白度的影响力。

Another major factor affecting the whiteness of titanium dioxide is some non-ferrous impurities, such as iron, cobalt, nickel, and so on. Some measures must be taken to remove them. For anatase titanium dioxide, the whiteness of the titanium dioxide with high iron content of 120 ppm is affected, even the phenomenon of photochromic mutual change occurs. The bleaching technology was used to increase the washing intensity of high iron, and some masking agents, such as antimony trioxide and phosphoric acid, were added to mask iron complexation to reduce the influence of impurity elements on the whiteness of titanium dioxide.

 

 

煅烧条件的控制，是钛白粉晶核定型的一个重要环节，良好的煅烧温度，可以使钛白粉脱硫、脱水完全，尽量避免钛白粉晶核的晶格缺陷，而影响其白度。因此，加大对关键温度点的控制，同时使进料量和窑体转速合理匹配，增加燃烧室，避免物料和火焰接触，发生烧结。

The control of calcination conditions is an important link in the nucleation of titanium dioxide. A good calcination temperature can make the titanium dioxide desulfurization and dehydration complete, avoid the lattice defect of titanium dioxide nucleus as far as possible, and affect its whiteness. Therefore, the control of key temperature points should be increased, and the feed rate and kiln speed should be matched reasonably. The combustion chamber should be increased to avoid material and flame contact and sintering.