The flash dryer mainly consists of an air intake system, heating system, feeding system, drying main unit, collection and dust removal system, exhaust system, and control system. During operation, the wet material is fed into the drying chamber by a screw feeder. In the drying chamber, the material encounters high-speed rotating hot air. The fine powder material is carried by the hot air to the upper part of the drying chamber, while the material that cannot be carried away falls to the bottom of the drying chamber. The material is then crushed by the bottom pulverizing device, rapidly dispersed, and the contact area between the material and the hot air is quickly increased. Under the action of centrifugal force (with a grading device at the top), products that have reached the drying degree and certain fineness are blown out of the grading device, and the material undergoes rapid drying in this process.

In recent years, China's titanium dioxide industry has seen several times growth in terms of capacity, output, and market demand, ushering in a period of prosperity for the titanium dioxide industry.

Titanium dioxide is considered one of the best-performing white pigments in the world, widely used in industries such as coatings, plastics, paper, printing, inks, chemical fibers, rubber, and cosmetics. Titanium dioxide has stable chemical properties and generally does not react with most substances under normal conditions. There are three crystalline forms of titanium dioxide in nature: brookite, anatase, and rutile. The coatings industry is the largest user of titanium dioxide, especially rutile titanium dioxide, with most of it consumed by the coatings industry. Coatings made with titanium dioxide have bright colors, strong coloring power, use less amount, and come in various types. They provide protection to the medium, enhance the mechanical strength and adhesion of the paint film, prevent cracks, resist ultraviolet rays and moisture penetration, and extend the life of the paint film.

The plastics industry is the second-largest user. Adding titanium dioxide to plastics can improve the heat resistance, light resistance, and weather resistance of plastic products, enhancing the physical and chemical properties of plastic products, improving their mechanical strength, and extending their service life.

The paper industry is the third-largest user of titanium dioxide. As a paper filler, it is mainly used in high-grade paper and thin paper. Adding titanium dioxide to paper provides good whiteness, gloss, high strength, thinness, smoothness, and prevents penetration during printing, resulting in light weight. Paper-making titanium dioxide generally uses untreated anatase titanium dioxide, which acts as a fluorescent whitening agent to enhance the whiteness of the paper. However, laminated paper requires surface-treated rutile titanium dioxide to meet light and heat resistance requirements.

Titanium dioxide is also an indispensable white pigment in high-grade inks. Inks containing titanium dioxide are durable and colorfast, with good surface wetting and easy dispersion. The ink industry uses both rutile and anatase types of titanium dioxide.

The textile and chemical fiber industry is another important application area for titanium dioxide. Titanium dioxide for chemical fibers is mainly used as a matting agent. Since anatase is softer than rutile, anatase is generally used. Chemical fiber titanium dioxide usually does not require surface treatment, but certain special types need surface treatment to reduce the photochemical activity of titanium dioxide and prevent fiber degradation due to the photocatalytic action of titanium dioxide.

The enamel industry is an important application area for titanium dioxide. Enamel-grade titanium dioxide has high purity, good whiteness, bright color, uniform particle size, strong refractive index, and high decolorization power. It has strong opacity and opacity, making the coating thin, smooth, and highly acid-resistant. It can be easily mixed with other materials in the enamel manufacturing process without agglomeration and easy to fuse.

The ceramic industry is also an important application area for titanium dioxide. Ceramic-grade titanium dioxide has high purity, uniform particle size, high refractive index, excellent high-temperature resistance, maintaining its color under 1200°C for one hour, high opacity, thin coating, and light weight. It is widely used in ceramics, construction, decoration, and other materials.

There are two methods for manufacturing titanium dioxide: the sulfate process and the chloride process. Among them, 56% are chloride process products, with over 70% of these products produced by major manufacturers like DuPont in the United States. Other countries, including China's titanium dioxide factories, mainly use the sulfate process.

Sulfate Process: The sulfate process involves acidifying titaniferous ore with concentrated sulfuric acid to produce ferrous sulfate, which is hydrolyzed to form metatitanic acid, then calcined and crushed to obtain titanium dioxide products. This method can produce both anatase and rutile titanium dioxide. The advantages of the sulfate process are that it can use cheap and readily available ilmenite and sulfuric acid as raw materials, the technology is relatively mature, equipment is simple, and corrosion-resistant materials are easy to solve. The disadvantages are the long process, mainly batch operation, wet operation, high consumption of sulfuric acid and water, many waste products and by-products, and significant environmental pollution.

Chloride Process: The chloride process involves mixing rutile or high-titanium slag with coke and performing high-temperature chlorination to produce titanium tetrachloride, which is then oxidized at high temperatures, followed by water filtration, washing, drying, and sealing to obtain titanium dioxide products. The chloride process can only produce rutile products. The advantages of the chloride process are a short process, easy expansion of production capacity, high degree of continuous automation, relatively low energy consumption, fewer "three wastes," and the ability to produce high-quality products.

Based on the material characteristics of titanium dioxide, our company has successfully applied independently developed dryers in titanium dioxide drying by digesting and absorbing advanced foreign equipment and technology.