改进锐钛型钛白粉应用性能的方法

A method to improve the application performance of anatase titanium dioxide

1、提高和稳定钛白粉白度的主要途径

1, the main way to improve and stabilize the 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 whiteness are hydrolytic quality, removal of impurity elements 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。

At present, there are two technologies for hydrolysis of titanium dioxide, including pressure hydrolysis and normal pressure hydrolysis. From the analysis of the quality of hydrolysis and the quality of the products, the quality of the hydrolysis is better and the particle size of the hydrolysate is uniform. In order to ensure the quality of hydrolysis, the quality of the concentrated titanium liquid must be strictly controlled, the ratio of iron and titanium and the solid content should be controlled within the specified range, and the control of the operating conditions of the hydrolysis process must be increased.

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 a number of impurity colored elements, such as iron, cobalt, nickel, and so on. Some measures must be taken to remove them. For the anatase titanium dioxide, the white degree of the high iron content in the 120ppm is affected, and even the light color exchange phenomenon occurs. With the use of bleaching technology, increasing the strength of the high iron, and adding a number of masking agents, such as three oxidation of two antimony and phosphoric acid, to the iron complexing masking, reducing 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 calcining conditions is an important link in the crystallization of titanium white powder. Good calcination temperature can make the titanium white powder desulphurized and dehydrated completely, and try to avoid lattice defects of the crystal nucleus of titanium white powder, and influence the whiteness of the titanium white powder. Therefore, the control of the key temperature points is increased, and the feed volume and the rotary speed of the kiln are properly matched, the combustion chamber is increased, the contact between the material and the flame is avoided and the sintering is occurred.

2、稳定钛白粉粒度分布，提高钛白粉分散性和遮盖力的途径

2. Stabilizing the particle size distribution of titanium dioxide and improving the dispersibility and hiding power of titanium dioxide.

钛白粉粒度分布是一个综合性的指标，它严重影响钛白粉颜料性能和产品应用性能，因此，对于遮盖力和分散性的讨论可直接从粒度分布上进行分析。

The particle size distribution of titanium dioxide powder is a comprehensive index. It seriously affects the performance of titanium dioxide pigment and the application performance of the product. Therefore, the discussion of the covering power and dispersity can be analyzed directly from the particle size distribution.

影响钛白粉粒度分布的因素较为复杂，首先是水解原始粒径的大小，通过控制和调节水解工艺条件，使原始粒径在一定范围内。其次是煅烧温度，偏钛酸在煅烧的过程中，粒子经历一个晶型转化期和成长期，控制适宜的温度，使成长粒子在一定范围内。最后就是产品的粉碎，通常对雷蒙磨的改造和分析器转速的调节，控制粉碎质量，同时可以采用其它粉碎设备，例如：万能磨、气流粉碎机和锤磨装置。

The factors that affect the particle size distribution of titanium dioxide are more complex. First, the size of the original particle size is hydrolyzed. By controlling and adjusting the hydrolysis conditions, the original particle size is within a certain range. The next is the calcination temperature. During the calcination process, the particles undergo a crystalline transformation period and growth period, which control the suitable temperature and make the growing particles within a certain range. Finally, it is the smashing of the products, usually the remolding of Raymond mill and the adjustment of the analyzer's speed, and controlling the crushing quality. At the same time, other crushing equipment, such as the universal mill, the airflow mill and the hammer mill, can be used.

3、通过表面处理，提高钛白粉的应用性能

3, improve the application performance of titanium dioxide by surface treatment.

钛白粉是极性很大的粉体，本性是亲水憎油的，但如果表面吸附有空气、水和其他污染物，则在水中的分散性降低，常常需要对其作表面处理，常用处理剂为水合氧化铝和水合氧化硅。目前市场上也有很多表面处理剂，例如：有机硅、偶联剂等进行处理，或者加一些其它无机颜料例如：硫酸钡、氢氧化铝等来改善钛白粉表面特性，提高其分散性。

Titanium dioxide is a very large polar powder, and its nature is hydrophilic and hydrophobic, but if the surface is adsorbed with air, water and other pollutants, the dispersivity of the water is reduced, and it is often required to be treated for surface treatment. The commonly used treatment agent is hydrated alumina and hydrated silicon oxide. At present, there are many surface treatment agents in the market, such as organosilicon, coupling agent, or some other inorganic pigments, such as barium sulfate and aluminum hydroxide, to improve the surface properties of titanium dioxide and improve its dispersibility.